技术领域technical field
本发明属于石油天然气、矿山工程、建筑基础工程施工、地质、水文等钻探设备技术领域，具体的讲涉及一种单牙轮钻头。The invention belongs to the technical field of drilling equipment such as petroleum and natural gas, mining engineering, building foundation engineering construction, geology, hydrology, etc., and specifically relates to a single cone bit.
背景技术Background technique
钻头是钻井工程中用以破碎岩石、形成井筒的破岩工具。现今钻井工程中所使用的钻头主要有牙轮钻头和PDC(聚晶金刚石复合片)钻头。The drill bit is a rock-breaking tool used in drilling engineering to break rock and form a wellbore. The drill bits used in drilling engineering today mainly include roller cone bits and PDC (polycrystalline diamond compact) drill bits.
牙轮钻头上的牙轮通过轴承系统与钻头体形成转动连接，钻头工作时，钻头体旋转带动牙轮绕钻头轴线转动的同时，牙轮还会绕自身的轴线转动，牙轮上的切削齿在上述两种运动的合成下作复杂的复合运动，牙轮钻头属非固定切削齿钻头。The cone on the roller cone bit forms a rotational connection with the bit body through the bearing system. When the drill bit is working, the rotation of the bit body drives the cone to rotate around the axis of the drill bit. At the same time, the cone will also rotate around its own axis. The cutting teeth on the cone Under the synthesis of the above two kinds of motion, complex compound motion is performed, and the roller cone bit is a non-fixed cutter bit.
单牙轮钻头是牙轮钻头中的一种，是钻井工程中使用的主要破岩工具之一，特别是在深井超深井的小井眼钻井中发挥着重要的作用。单牙轮钻头主要利用牙轮上的牙齿(切削齿)对岩石的挤压刮切作用破岩，牙轮上的切削齿在井底以网状形式刮切岩石。单牙轮钻头牙轮上的切削齿一部分(牙轮前端)始终与井底接触破岩，一部分切削齿轮换与井底接触破岩,这就把单牙轮钻头的牙轮分成了恒接触区(牙轮前端，如图5的21)和交替接触区(如图5的22)。The single cone bit is one of the roller cone bits, and it is one of the main rock-breaking tools used in drilling engineering, especially playing an important role in the slim hole drilling of deep and ultra-deep wells. The single cone bit mainly uses the teeth (cutters) on the cone to squeeze and scrape the rock to break the rock. The cutters on the cone scrape the rock in a mesh form at the bottom of the well. A part of the cutting teeth (the front end of the cone) on the single-cone bit is always in contact with the bottom of the well to break the rock, and a part of the cutting gear is in contact with the bottom of the well to break the rock, which divides the cone of the single-cone bit into a constant contact area (cone front end, such as 21 in Figure 5) and alternate contact areas (22 in Figure 5).
单牙轮钻头钻进过程中牙轮绕钻头轴线旋转的同时还绕自身的轴线自转，牙轮上的切削齿相对井底岩石的刮切方向在不断地变化：牙轮恒接触区上的切削齿在刮切岩石过程中，其相对岩石的刮切方向在0～360°之间不断变化；牙轮交替接触区上的切削齿在刮切岩石过程中，其相对岩石的刮切方向在0～180°之间变化。这使单牙轮钻头上无法直接应用极适合于以刮切形式破岩的聚晶金刚石复合片(PDC齿)等耐磨性极强的金刚石类切削齿。原因在于聚晶金刚石复合片(PDC齿)是由本体和聚晶金刚石层两部分组成，对岩石起主要刮切效果的是聚晶金刚石层，PDC齿刮切工作时具有方向性，只能是聚晶金刚石层在前本体在后。如果PDC齿在工作过程中直接受到反向作用力，很容易造成聚晶金刚石层的崩裂，严重降低PDC齿的工作寿命，甚至在极短的时间内使PDC齿损坏失效。During the drilling process of a single cone bit, the cone rotates around the axis of the bit and at the same time it rotates around its own axis. The cutting direction of the cutting teeth on the cone relative to the rock at the bottom of the well is constantly changing: the cutting on the constant contact area of the cone In the process of scraping the rock, the scraping direction of the relative rock is constantly changing between 0° and 360°; the cutting tooth on the alternate contact area of the gear wheel is in the process of scraping the rock, and its scraping direction relative to the rock is between 0 and 360°. ~180°changes. This makes it impossible to directly apply highly wear-resistant diamond cutting teeth such as polycrystalline diamond compacts (PDC teeth) that are extremely suitable for breaking rocks in the form of scraping on the single cone bit. The reason is that the polycrystalline diamond composite (PDC tooth) is composed of two parts: the body and the polycrystalline diamond layer. The polycrystalline diamond layer has the main scraping effect on the rock. The PDC tooth scraping work has directionality and can only be The polycrystalline diamond layer is in the front and behind the body. If the PDC teeth are directly subjected to a reverse force during the working process, it is easy to cause the cracking of the polycrystalline diamond layer, seriously reducing the working life of the PDC teeth, and even causing the PDC teeth to be damaged and invalid in a very short time.
因此，现有单牙轮钻头上的切削齿一般为硬质合金齿，硬质合金齿的耐磨性远不及PDC齿等金刚石类切削齿。切削齿的耐磨性不足是单牙轮钻头的致命弱点，切削齿易磨损严重影响了单牙轮钻头的使用寿命。Therefore, the cutting teeth on the existing single-cone bit are generally cemented carbide teeth, and the wear resistance of the cemented carbide teeth is far inferior to that of diamond class cutting teeth such as PDC teeth. The lack of wear resistance of the cutting teeth is the Achilles heel of the single-cone bit, and the easy wear of the cutting teeth seriously affects the service life of the single-cone bit.
发明内容Contents of the invention
本发明的目的在于：提出一种具有PDC组合齿的单牙轮钻头，以提高单牙轮钻头的破岩效率和使用寿命。The object of the present invention is to propose a single-cone drill bit with PDC combined teeth, so as to improve the rock-breaking efficiency and service life of the single-cone drill bit.
本发明目的通过下述技术方案来实现：The object of the invention is achieved through the following technical solutions:
一种具有PDC组合齿的单牙轮钻头，包括钻头体和牙轮，牙轮与钻头体为转动连接，牙轮上设置有切削齿，牙轮上的切削齿至少有一颗为PDC组合齿，PDC组合齿由两颗PDC齿组合而成，PDC齿由本体和覆盖本体支撑面60％以上区域的聚晶金刚石层构成(优选由本体和覆盖本体整个支撑面的聚晶金刚石层构成)，两颗PDC齿的组合方式为聚晶金刚石层紧密贴合，并由外侧的两本体夹持呈四层夹心结构，且靠近牙轮部分的厚度大于远离牙轮部分的厚度，最远离牙轮的尖端部分的两侧本体厚度均小于中间聚晶金刚石层厚度的2倍，固定于牙轮内的两侧本体厚度均大于中间聚晶金刚石层厚度的3倍；PDC组合齿的聚晶金刚石层贴合面的法线与牙轮上该PDC组合齿设置点处的牙轮轮廓曲面的法线的夹角在75-90°。A single-cone drill bit with PDC combined teeth, including a drill body and a cone, the cone and the drill body are in rotational connection, the gear is provided with cutting teeth, at least one of the cutting teeth on the cone is a PDC combination tooth, The PDC combination teeth are composed of two PDC teeth. The PDC teeth are composed of a body and a polycrystalline diamond layer covering more than 60% of the supporting surface of the body (preferably composed of a body and a polycrystalline diamond layer covering the entire supporting surface of the body). The combination of two PDC teeth is that the polycrystalline diamond layer is closely attached, and is clamped by the two outer bodies to form a four-layer sandwich structure, and the thickness of the part close to the cone is greater than the thickness of the part far away from the cone, and the tip farthest from the cone The thickness of the body on both sides of the part is less than twice the thickness of the middle polycrystalline diamond layer, and the thickness of the two sides of the body fixed in the cone is greater than three times the thickness of the middle polycrystalline diamond layer; the polycrystalline diamond layer of the PDC composite tooth is bonded The included angle between the normal of the surface and the normal of the cone contour surface at the setting point of the PDC combined tooth on the cone is 75-90°.
聚晶金刚石复合片又称PDC齿(Polycrystalline Diamond Compact)或PDC复合片，由聚晶金刚石层和本体两部分组成(参考图6)。PDC齿采用金刚石微粉与硬质合金基片在超高压高温条件下烧结而成。金刚石微粉形成PDC齿的聚晶金刚石层(厚度一般在0.5-3mm之间)，硬质合金基片成为PDC齿的本体。PDC齿既具有金刚石的高硬度、高耐磨性，又具有硬质合金的强度与抗冲击韧性，是制造切削刀具、钻井钻头及其他耐磨工具的理想材料。PDC齿适合于以刮切的方式工作，由于PDC齿的聚晶金刚石层的硬度和耐磨性远远高于硬质合金材料的本体，因此PDC齿在刮切工作时具有自锐性，即聚晶金刚石层的磨损速度明显慢于本体，使PDC齿的切削刃(硬而耐磨的聚晶金刚石层)始终保持锐利状态。Polycrystalline diamond compact, also known as PDC tooth (Polycrystalline Diamond Compact) or PDC compact, consists of two parts, a polycrystalline diamond layer and a body (refer to Figure 6). PDC teeth are sintered with diamond micropowder and cemented carbide substrate under ultra-high pressure and high temperature conditions. The diamond powder forms the polycrystalline diamond layer of the PDC tooth (thickness is generally between 0.5-3mm), and the cemented carbide substrate becomes the body of the PDC tooth. PDC tooth not only has the high hardness and high wear resistance of diamond, but also has the strength and impact resistance toughness of cemented carbide. It is an ideal material for manufacturing cutting tools, drilling bits and other wear-resistant tools. PDC teeth are suitable for scraping work. Because the hardness and wear resistance of the polycrystalline diamond layer of PDC teeth are much higher than that of the hard alloy material, the PDC teeth have self-sharpening during scraping work, that is, The wear speed of the polycrystalline diamond layer is obviously slower than that of the main body, so that the cutting edge of the PDC tooth (hard and wear-resistant polycrystalline diamond layer) is always kept sharp.
PDC齿刮切工作时，起主要刮切作用的是聚晶金刚石层。PDC齿的聚晶金刚石层硬而脆，本体相对软但具有很好的抗冲击韧性，因此PDC齿刮切工作时具有方向性，只能是聚晶金刚石层在前本体在后进行刮切(参考图7)，即本体处在聚晶金刚石层的后部推持支撑着聚晶金刚石层。如果PDC齿在工作过程中反向运动，本体在前聚晶金刚石层在后进行刮切，聚晶金刚石层直接受到反向作用力，很容易造成聚晶金刚石层的崩裂或脱落，严重降低PDC齿的工作寿命，甚至在极短的时间内使PDC齿损坏失效。When the PDC tooth is scraping and cutting, the polycrystalline diamond layer plays the main role of scraping and cutting. The polycrystalline diamond layer of the PDC tooth is hard and brittle, and the body is relatively soft but has good impact toughness. Therefore, the PDC tooth scraping work has directionality, and the polycrystalline diamond layer can only be scraped in front of the body ( Referring to FIG. 7 ), that is, the body is at the rear of the polycrystalline diamond layer and pushes and supports the polycrystalline diamond layer. If the PDC tooth moves in the reverse direction during the working process, the body will scrape the front polycrystalline diamond layer and the rear, and the polycrystalline diamond layer will be directly subjected to the reverse force, which will easily cause the polycrystalline diamond layer to crack or fall off, seriously reducing the PDC. The working life of the tooth, even the PDC tooth is damaged and invalidated in a very short time.
本专利中，PDC组合齿的聚晶金刚石层贴合面的法线，是指垂直于PDC组合齿的聚晶金刚石层贴合面的直线。牙轮轮廓曲面，是指在设置切削齿前，原牙轮实体表面(曲面)。牙轮轮廓曲面某点处的法线，是指垂直于该点切平面的直线。牙轮上的PDC组合齿设置点，是指在设置PDC组合齿前，原牙轮表面上用以设置切削齿的定位(参考)点。轴平面是指过牙轮轴线的平面；过PDC组合齿设置点的轴平面是指既过PDC组合齿设置点又过牙轮轴线的平面，即由PDC组合齿设置点和牙轮轴线确定的平面。In this patent, the normal line of the bonding surface of the polycrystalline diamond layer of the PDC composite tooth refers to a straight line perpendicular to the bonding surface of the polycrystalline diamond layer of the PDC composite tooth. The contour surface of the cone refers to the solid surface (curved surface) of the original cone before setting the cutting teeth. The normal at a point on the contour surface of the cone is the straight line perpendicular to the tangent plane at the point. The PDC combined tooth setting point on the gear refers to the positioning (reference) point on the surface of the original gear used to set the cutting teeth before the PDC combined teeth are set. The axis plane refers to the plane passing through the axis of the cone; the axis plane passing through the setting point of the PDC combination tooth refers to the plane passing through both the setting point of the PDC combination tooth and the axis of the cone, which is determined by the setting point of the PDC combination tooth and the axis of the cone flat.
本专利中将两颗聚晶金刚石层相贴合的PDC齿形成的PDC组合齿设置在单牙轮钻头的牙轮上，其较现有技术的有益效果是：In this patent, the PDC combined teeth formed by the PDC teeth of two polycrystalline diamond layers bonded together are arranged on the cone of the single cone bit, and its beneficial effect compared with the prior art is:
1、本专利单牙轮钻头上的PDC组合齿由两颗聚晶金刚石层相贴合的PDC齿构成，PDC组合齿的聚晶金刚石层处在两PDC齿的硬质合金本体的中间，形成前后都有硬质合金本体中间是聚晶金刚石层的组合齿。PDC组合齿在刮切破岩过程中，无论组合齿相对岩石的刮切方向如何，各PDC齿的聚晶金刚石层均不会像普通单颗PDC齿那样使本体在前聚晶金刚石层在后刮切岩石。PDC组合齿的两颗PDC齿的聚晶金刚石层是相互紧密贴合的，当一颗PDC齿的本体在前聚晶金刚石层在后时，另一颗PDC齿的聚晶金刚石层将在前而本体在后，刮切过程中总有本体在后推持支撑着聚晶金刚石层。这样，无论切削齿相对岩石的运动方向如何改变，PDC组合齿都不会像单颗独立的PDC齿那样发生聚晶金刚石层的崩裂或脱落。另外，牙轮上的PDC组合齿由两颗PDC齿组合构成，其耐磨性远远高于普通牙轮钻头上采用的硬质合金齿。因此，PDC组合齿应用在单牙轮钻头的牙轮上将能明显提高钻头牙齿的耐磨性，进而提高钻头的使用寿命。1. The PDC composite teeth on the single-cone bit of this patent are composed of two PDC teeth with polycrystalline diamond layers attached to each other. The polycrystalline diamond layer of the PDC composite teeth is in the middle of the hard alloy body of the two PDC teeth, forming Both front and back have composite teeth with cemented carbide body and polycrystalline diamond layer in the middle. During the scraping and rock breaking process of PDC combined teeth, regardless of the scraping direction of the combined teeth relative to the rock, the polycrystalline diamond layer of each PDC tooth will not make the body in front of the polycrystalline diamond layer in the rear like ordinary single PDC teeth Scrape rocks. The polycrystalline diamond layers of the two PDC teeth of the PDC composite tooth are closely attached to each other. When the body of one PDC tooth is in the front and the polycrystalline diamond layer is behind, the polycrystalline diamond layer of the other PDC tooth will be in the front. And the main body is behind, and there is always the main body pushing and supporting the polycrystalline diamond layer during the scraping process. In this way, no matter how the moving direction of the cutting tooth changes relative to the rock, the PDC composite tooth will not crack or fall off the polycrystalline diamond layer like a single independent PDC tooth. In addition, the PDC combination tooth on the cone bit is composed of two PDC teeth, and its wear resistance is much higher than that of the cemented carbide tooth used on the ordinary cone bit. Therefore, the application of PDC combined teeth on the cone of the single-cone drill bit will significantly improve the wear resistance of the drill bit teeth, thereby increasing the service life of the drill bit.
2、本专利的PDC组合齿采用两颗PDC齿组合而成的四层夹心结构(本体-聚晶金刚石层-聚晶金刚石层-本体)，可以直接采用现有PDC齿直接组合而成，最为简单高效。根据本专利前述内容，本领域技术人员可知，作为本专利结构的一种容易想到的替代：三层夹心结构(本体-聚晶金刚石层-本体)，这种结构可以想到的两种实现方式，一种是直接整体成型，这种方案理论上可以实现，但由于实际加工过程过于困难，几乎无法实现，无法具备本专利在产业上应用的显著便利高效优势；另一种是现有PDC齿与单独本体的组合，同样地，需要额外设计加工一个单独的本体，无法具备本专利在产业上应用的显著便利高效优势。这是因为，PDC齿的聚晶金刚石层与单独的本体直接贴合，当PDC齿反向刮切时，单独本体为PDC齿的聚晶金刚石层提供的是接触式的机械推力，单独本体与聚晶金刚石层未形成紧密融合，PDC齿的聚晶金刚石层受反向作用力刮切磨损时，聚晶金刚石层的磨损脱落与单独的PDC齿反向刮切时的磨损脱落类似。单独本体只能给聚晶金刚石层机械推力，而不能提供保持作用。而本专利由两颗PDC齿组合而成，无论切削齿朝那个方向运动，组合齿总有一颗PDC齿为聚晶金刚石层在前本体在后的顺向刮切，该齿的本体为两颗PDC齿提供推持力的同时，还能为自身的聚晶金刚石层提供保持力，因为本体与聚晶金刚石层是通过化学的、物理的反应后结合在一起的，其相互融合渗透，本体与聚晶金刚石层之间具有化学键的作用力。本体对聚晶金刚石层的这种保持力使PDC齿磨损缓慢，组合齿的一颗PDC齿缓慢磨损会减缓另一颗齿的磨损，从而提高整颗组合齿的性能和寿命。此外，作为一种变形，曾有在单颗PDC齿的本体圆柱面上设置少量聚晶金刚石，聚晶金刚石陷入本体的深度在2mm以内，小于圆柱直径的五分之一，本体圆柱面上设置的聚晶金刚石距本体端面上的聚晶金刚石层的距离(沿PDC齿圆柱轴向)大于2mm，但这种方案很快被淘汰。原因是：这种PDC齿的圆柱面上设置少量的聚晶金刚石，为的是减缓PDC齿在研磨性强的地层中的磨损速度，但由于圆柱面上的聚晶金刚石与本体端面上聚晶金刚石层必须设置一段距离(大于2mm，为端面上的聚晶金刚石层提供有效的本体，避免聚晶金刚石层无足够的本体支撑和保持强度)，较大的距离使PDC齿的承压面大大增大，而PDC齿能高效刮切破岩的前提是PDC齿能先吃入(侵入)岩石，该方案使PDC齿无法有效吃入地层，同时也抵消了PDC齿的自锐功能，降低了PDC齿的破岩效率，因此使用效果不佳，很快被淘汰。本专利的PDC组合齿由两颗聚晶金刚石层紧密贴合的PDC齿构成，能避免上述问题，且简单高效。2. The PDC composite tooth of this patent adopts a four-layer sandwich structure (body-polycrystalline diamond layer-polycrystalline diamond layer-body) composed of two PDC teeth, which can be directly combined with existing PDC teeth. Simple and efficient. According to the foregoing content of this patent, those skilled in the art know that as an easily conceivable alternative to the structure of this patent: a three-layer sandwich structure (body-polycrystalline diamond layer-body), there are two conceivable implementations of this structure, One is direct integral molding, which can be realized in theory, but it is almost impossible to realize because the actual processing process is too difficult, and it cannot have the obvious advantages of convenience and high efficiency in the industrial application of this patent; the other is the existing PDC tooth and The combination of separate bodies, similarly, requires an additional design and processing of a separate body, which cannot have the obvious advantages of convenience and high efficiency in the industrial application of this patent. This is because the polycrystalline diamond layer of the PDC tooth is directly attached to the separate body. When the PDC tooth scrapes in reverse, the single body provides a contact mechanical thrust for the polycrystalline diamond layer of the PDC tooth. The separate body and The polycrystalline diamond layer did not form a tight fusion, and when the polycrystalline diamond layer of the PDC tooth was scraped and worn by the reverse force, the wear and fall of the polycrystalline diamond layer was similar to that of a single PDC tooth when it was scraped in reverse. The body alone can only give mechanical thrust to the polycrystalline diamond layer, but cannot provide retention. However, this patent is composed of two PDC teeth. Regardless of the direction in which the cutting teeth move, there is always a PDC tooth in the combination tooth that cuts the polycrystalline diamond layer in the front and the body behind. The body of the tooth is two While the PDC tooth provides the pushing force, it can also provide the holding force for its own polycrystalline diamond layer, because the body and the polycrystalline diamond layer are combined through chemical and physical reactions, and they fuse and penetrate each other, and the body and the polycrystalline diamond layer There is a chemical bond between the polycrystalline diamond layers. The holding force of the body to the polycrystalline diamond layer makes the PDC tooth wear slowly, and the slow wear of one PDC tooth of the combined tooth will slow down the wear of the other tooth, thereby improving the performance and life of the entire combined tooth. In addition, as a modification, a small amount of polycrystalline diamond was placed on the cylindrical surface of the body of a single PDC tooth. The distance between the polycrystalline diamond and the polycrystalline diamond layer on the end face of the body (along the axial direction of the PDC tooth cylinder) is greater than 2mm, but this solution is quickly eliminated. The reason is: a small amount of polycrystalline diamond is set on the cylindrical surface of this PDC tooth in order to slow down the wear speed of the PDC tooth in the formation with strong abrasiveness, but because the polycrystalline diamond on the cylindrical surface and the polycrystalline diamond on the end surface of the body The diamond layer must be set at a certain distance (greater than 2mm, to provide an effective body for the polycrystalline diamond layer on the end face, to prevent the polycrystalline diamond layer from having sufficient body support and strength), and a larger distance makes the pressure-bearing surface of the PDC tooth greatly However, the premise that the PDC teeth can scrape and cut rocks efficiently is that the PDC teeth can eat (intrude) the rock first. This scheme prevents the PDC teeth from effectively eating into the formation, and also offsets the self-sharpening function of the PDC teeth, reducing the The rock-breaking efficiency of PDC teeth is not good, so they are quickly eliminated. The PDC composite tooth of this patent is composed of two PDC teeth with closely bonded polycrystalline diamond layers, which can avoid the above problems, and is simple and efficient.
3、PDC齿在刮切工作时具有良好的自锐性，聚晶金刚石层的磨损速度明显慢于本体。PDC组合齿由两颗聚晶金刚石层相贴合的PDC齿构成，PDC组合齿的中间硬，耐磨性高，两边的本体相对软，耐磨性弱，这便于PDC组合齿的中间出刃，使PDC组合齿能始终保持中间金刚石的良好出露。单牙轮钻头上的切削齿在钻头破岩工作过程中，切削齿相对岩石之间的刮切方向在不断变化(牙轮恒接触区上的切削齿刮切破岩时相对岩石的刮切方向在0～360°之间不断变化；牙轮交替接触区上的切削齿在刮切破岩时相对岩石的刮切方向在0～180°之间变化)，牙轮上的硬质合金齿在刮切方向不断变化的过程中齿顶菱角会被磨圆钝化，刮切效率降低。PDC组合齿用于单牙轮上，无论切削齿的刮切方向如何变化，其都能保持齿顶自锐，金刚石出露刮切破岩，使齿顶始终保持锐利状态避免钝化，其相对硬质合金齿更易于侵入岩石、更易于刮切破岩。因此，单牙轮钻头的牙轮上使用PDC组合齿能明显提高钻头使用寿命的同时，提高钻头切削齿的刮切效率和钻头的破岩效率。特别是本专利中组合齿靠近牙轮部分的厚度大于远离牙轮部分的厚度，最远离牙轮的尖端部分的两侧本体厚度均小于中间聚晶金刚石层厚度的2倍，固定于牙轮内的两侧本体厚度均大于中间聚晶金刚石层厚度的3倍，由此组合齿形成纵断面轮廓上尖下宽的形式。与牙轮固结的下部两侧本体层厚度均远大于聚晶金刚石层，为聚晶金刚石层提供了更好的稳固力，而作为朝向井底的工作部位的上部，其两侧本体层又均非常薄(乃至极限厚度逼近零)使得组合齿在井底工作时，尖部两侧的本体层很薄，组合齿吃入(侵入)岩石时的比压高，易于吃入岩石，也有利于本体的较快磨损而出露出中间的聚晶金刚石层，使得聚晶金刚石层能尽快出露而有效地吃入地层，并利用PDC齿的自锐性能提高刮切效率。3. The PDC teeth have good self-sharpening during scraping, and the wear speed of the polycrystalline diamond layer is obviously slower than that of the main body. The PDC composite tooth is composed of two PDC teeth with polycrystalline diamond layers bonded together. The middle of the PDC composite tooth is hard and has high wear resistance. The bodies on both sides are relatively soft and have weak wear resistance. So that the PDC combined teeth can always maintain a good exposure of the middle diamond. During the rock-breaking process of the cutting teeth on the single-cone bit, the cutting direction of the cutting teeth relative to the rock is constantly changing (the cutting direction of the cutting teeth on the constant contact area of the cone cutting relative to the rock when cutting the rock It is constantly changing between 0 and 360°; the cutting direction of the cutting teeth on the alternate contact area of the tooth wheel is between 0 and 180° relative to the rock when scraping and breaking the rock), and the cemented carbide teeth on the tooth wheel are in the During the process of changing the scraping direction, the water chestnut at the top of the tooth will be rounded and passivated, and the scraping efficiency will be reduced. PDC combined teeth are used on single-cone gears. No matter how the cutting direction of the cutting teeth changes, it can keep the top of the tooth self-sharpening. The exposed diamond scrapes and cuts the rock, so that the top of the tooth is always sharp and avoids passivation. Carbide teeth are easier to penetrate rock, scrape and break rock more easily. Therefore, the use of PDC combined teeth on the cone of the single-cone drill bit can significantly increase the service life of the drill bit, and at the same time improve the scraping efficiency of the cutting teeth of the drill bit and the rock-breaking efficiency of the drill bit. In particular, in this patent, the thickness of the part of the composite tooth close to the cone is greater than the thickness of the part away from the cone, and the thickness of the bodies on both sides of the tip part farthest from the cone is less than twice the thickness of the middle polycrystalline diamond layer, which is fixed in the cone. The thickness of both sides of the body is greater than 3 times the thickness of the middle polycrystalline diamond layer, so that the combined teeth form a vertical profile with a sharp top and a wide bottom. The thickness of the body layer on both sides of the lower part consolidated with the cone is much larger than that of the polycrystalline diamond layer, which provides better stability for the polycrystalline diamond layer. As the upper part of the working part facing the bottom of the well, the body layers on both sides are also Both are very thin (even the limit thickness is close to zero) so that when the combined tooth works at the bottom of the well, the body layer on both sides of the tip is very thin, and the specific pressure when the combined tooth penetrates (intrudes) into the rock is high, and it is easy to penetrate the rock. It is beneficial to the rapid wear of the body to expose the polycrystalline diamond layer in the middle, so that the polycrystalline diamond layer can be exposed as soon as possible and effectively eat into the formation, and the self-sharpening performance of the PDC teeth is used to improve the scraping efficiency.
4、由于单牙轮钻头上的切削齿在钻头体旋转及牙轮自身旋转的复合运动下相对岩石刮切运动，牙轮上的切削齿相对井底岩石的刮切方向在不断变化。本专利中，PDC组合齿设置在牙轮上时，PDC组合齿的聚晶金刚石层贴合面的法线与牙轮上该PDC组合齿设置点处的牙轮轮廓曲面的法线的夹角在75-90°之间。即组合齿贴合面的法线与设置点处的牙轮轮廓曲面的法线垂直或接近垂直，也即组合齿的聚晶金刚石层贴合面与设置点处的牙轮轮廓曲面的法线平行或接近平行。这样能确保牙轮上的组合齿在刮切方向不断变化的复杂运动下，组合齿的聚晶金刚石层始终以垂直或接近于垂直的方向侵入(吃入)岩石进行刮切破岩(类似于图7中PDC齿的刮切方式)，组合齿的聚晶金刚石层与两侧的本体能同时磨损，且磨损方向沿着聚晶金刚石层贴合面的方向(垂直于聚晶金刚石层贴合面的法线方向)。其能使组合齿充分利用PDC良好的刮切性能和自锐性。若非上述设置方式，PDC组合齿将会先磨损某一侧本体，待本体磨损之后，然后再磨损聚晶金刚石层，这将无法利用PDC齿优良的刮切性能和自锐性，相反还会降低单牙轮钻头的破岩效率。因此，本专利能充分利用PDC齿的优点，提高钻头性能。4. Since the cutting teeth on the single-cone bit scrape relative to the rock under the combined motion of the bit body rotation and the cone itself, the cutting direction of the cutting teeth on the cone relative to the rock at the bottom of the well is constantly changing. In this patent, when the PDC composite tooth is set on the cone, the angle between the normal of the polycrystalline diamond layer bonding surface of the PDC composite tooth and the normal of the cone contour surface at the setting point of the PDC composite tooth on the cone Between 75-90°. That is to say, the normal line of the joint surface of the combined tooth is perpendicular or close to vertical to the normal line of the cone contour surface at the setting point, that is, the normal line of the polycrystalline diamond layer bonding surface of the combined tooth and the cone contour surface at the setting point parallel or nearly parallel. This can ensure that the combined teeth on the gear wheel are constantly changing the complex movement of the scraping direction, and the polycrystalline diamond layer of the combined teeth always invades (eats) the rock in a vertical or close to vertical direction to scrape and break the rock (similar to The scraping method of the PDC tooth in Figure 7), the polycrystalline diamond layer of the combined tooth and the body on both sides can wear simultaneously, and the wear direction is along the direction of the bonding surface of the polycrystalline diamond layer (perpendicular to the bonding of the polycrystalline diamond layer the normal direction of the face). It enables the combined teeth to take full advantage of the good scraping performance and self-sharpening of the PDC. If it is not the above-mentioned setting method, the PDC combined teeth will wear one side of the body first, and then wear the polycrystalline diamond layer after the body is worn. This will not be able to use the excellent scraping performance and self-sharpening of the PDC teeth, but will reduce Rock breaking efficiency of single cone bit. Therefore, this patent can make full use of the advantages of the PDC teeth to improve the performance of the drill bit.
5、单牙轮钻头只有一个牙轮，易于小井眼化，本应是深井、超深井钻井中很好的钻井工具，但由于单牙轮钻头现有的切削齿耐磨性差，刮切破岩效率较低，限制了单牙轮钻头的应用效果，因此在钻井施工中已慢慢很少使用单牙轮钻头了。本专利的PDC齿以聚晶金刚石层相贴合的方式形成PDC组合齿，使极适合于以刮切形式破岩的PDC齿能应用在单牙轮钻头上，提高了钻头的破岩效率和使用寿命，这将扩宽单牙轮钻头的使用范围，增强单牙轮钻头在钻井中(特别是深井中)的应用价值。同时，因为单牙轮钻头主要是刮切破岩，单牙轮上的切削齿在井底刮切很长的时间和距离(交替接触区上的切削齿)再切出井底或一直在井底刮切(恒接触区上的切削齿)，单牙轮钻头与PDC组合齿的结合，能够更适合PDC组合齿作用的发挥；而其他多牙轮钻头或牙轮与其他切削结构复合的复合钻头，由于牙轮主要是冲压破岩，PDC齿不适合于冲压破岩，PDC组合齿的作用无法充分发挥。5. The single-cone bit has only one cone, which is easy to slim down the hole. It should be a good drilling tool in deep and ultra-deep well drilling. However, due to the poor wear resistance of the existing cutting teeth of the single-cone bit, scraping and breaking rock The efficiency is low, which limits the application effect of the single-cone bit, so the single-cone bit is rarely used in drilling construction. The PDC teeth of this patent form PDC composite teeth in the way of bonding polycrystalline diamond layers, so that the PDC teeth that are extremely suitable for rock breaking in the form of scraping can be applied to single-cone drill bits, which improves the rock breaking efficiency of the drill bit and Service life, which will broaden the range of use of the single-cone bit and enhance the application value of the single-cone bit in drilling (especially in deep wells). At the same time, because the single-cone bit is mainly used to scrape and break rock, the cutting teeth on the single-cone scrape at the bottom of the well for a long time and distance (cutting teeth on the alternate contact area) and then cut out the bottom of the well or remain at the bottom of the well Scraping (cutting teeth on the constant contact area), the combination of single-cone bit and PDC combination tooth, can be more suitable for the function of PDC combination tooth; while other multi-cone bits or compound drill bits combined with other cutting structures , because the cone is mainly used for punching and breaking rocks, PDC teeth are not suitable for punching and breaking rocks, and the effect of PDC combined teeth cannot be fully exerted.
作为选择，本专利的牙轮为球状。As an option, the cone of this patent is spherical.
作为选择，PDC组合齿的聚晶金刚石层贴合面的法线与牙轮上该PDC组合齿设置点处的牙轮轮廓曲面的法线的夹角为90°(即两法线垂直)。As an option, the included angle between the normal of the polycrystalline diamond layer bonding surface of the PDC composite tooth and the normal of the cone contour surface at the setting point of the PDC composite tooth on the cone is 90° (that is, the two normals are perpendicular).
作为选择，PDC组合齿的聚晶金刚石层平面与过该PDC组合齿设置点的轴平面之间的夹角在45-90°；进一步地，PDC组合齿的聚晶金刚石层平面与过该PDC组合齿设置点的轴平面之间的夹角在60-90°；更进一步地，PDC组合齿的聚晶金刚石层平面与过该PDC组合齿设置点的轴平面之间的夹角在75-90°；特别地，PDC组合齿的聚晶金刚石层平面与过该PDC组合齿设置点的轴平面垂直。本专利的PDC组合齿在牙轮上可以有各种布置方向/角度，牙轮上的切削齿在井底刮切的距离很长，且刮切过程中切削齿相对井底岩石的刮切方向在不断地变化，PDC组合齿的聚晶金刚石层平面与过该PDC组合齿设置点的轴平面夹角较大或垂直时，PDC组合齿在井底刮切岩石的刮切量(刮切岩石的体积)比较小夹角时大，其中聚晶金刚石层平面与过该PDC组合齿设置点的轴平面的夹角接近90°或垂直时的布置方向/角度最佳，能够最大化发挥PDC组合齿的刮切能力。As an option, the angle between the polycrystalline diamond layer plane of the PDC composite tooth and the axial plane passing through the PDC composite tooth setting point is 45-90°; further, the polycrystalline diamond layer plane of the PDC composite tooth and the PDC composite tooth The angle between the axial planes of the combined teeth setting point is 60-90°; further, the angle between the polycrystalline diamond layer plane of the PDC combined teeth and the axial plane passing the PDC combined teeth setting point is 75- 90°; in particular, the plane of the polycrystalline diamond layer of the PDC composite tooth is perpendicular to the axis plane passing through the setting point of the PDC composite tooth. The PDC combination teeth of this patent can have various arrangement directions/angles on the cone, the cutting teeth on the cone have a long scraping distance at the bottom of the well, and the cutting direction of the cutting teeth relative to the rock at the bottom of the well during the scraping process When the angle between the plane of the polycrystalline diamond layer of the PDC combined teeth and the axial plane passing through the setting point of the PDC combined teeth is large or vertical, the scraping amount of the PDC combined teeth scraping the rock at the bottom of the well (scraping the rock) is constantly changing. The volume) is larger when the angle is small, and the angle between the polycrystalline diamond layer plane and the axial plane passing through the PDC combination tooth setting point is close to 90° or vertical. The arrangement direction/angle is the best, and the PDC combination can be maximized tooth scraping ability.
作为选择，PDC组合齿设置在牙轮的恒接触区上。该方案中，单牙轮钻头破岩工作过程中，牙轮恒接触区上的切削齿始终与井底接触破岩，其磨损速度快于其他区域上的切削齿。牙轮的恒接触区上设置PDC组合齿将能明显提高该区域切削齿的耐磨性和刮切效率，从而提高钻头的使用寿命和破岩效率。Alternatively, PDC composite teeth are provided on the constant contact area of the cone. In this scheme, during the rock-breaking operation of the single-cone bit, the cutting teeth on the constant contact area of the cone are always in contact with the bottom of the well to break the rock, and their wear speed is faster than that of the cutting teeth on other areas. Setting the PDC combined teeth on the constant contact area of the cone can obviously improve the wear resistance and scraping efficiency of the cutting teeth in this area, thereby improving the service life of the drill bit and the rock breaking efficiency.
作为选择，PDC组合齿设置在牙轮的交替接触区上。该方案中，DC组合齿设置在牙轮的交替接触区上将能明显提高该区域切削齿的耐磨性和刮切效率。Alternatively, PDC combination teeth are provided on alternating contact areas of the cones. In this solution, the DC combined teeth are arranged on the alternate contact area of the cone, which can obviously improve the wear resistance and scraping efficiency of the cutting teeth in this area.
作为选择，PDC组合齿的两侧本体的外侧被斜切，形成上窄下宽的楔形结构的PDC组合齿。该方案中，上窄下宽的楔形结构使PDC组合齿的上部更窄(薄)更尖锐，有利于PDC组合齿侵入岩石提高钻头破岩效率。As an option, the outer sides of the bodies on both sides of the PDC composite teeth are chamfered to form PDC composite teeth with a wedge-shaped structure with a narrow top and a wide bottom. In this solution, the wedge-shaped structure with a narrow top and a wide bottom makes the upper part of the PDC composite teeth narrower (thinner) and sharper, which is conducive to the penetration of the PDC composite teeth into rocks and improves the rock-breaking efficiency of the drill bit.
作为选择，PDC组合齿的两侧本体的外侧被内凹曲线切除，形成上窄下宽结构的PDC组合齿。该方案中，PDC组合齿的两端本体被内凹曲线切除，使PDC组合齿的上部更尖锐，有利于PDC组合齿侵入岩石提高钻头破岩效率。同时，两端本体被内凹曲线切除的PDC组合齿，从齿顶往下齿厚的增加缓慢。当PDC组合齿有磨损时，两侧本体内凹切除能减缓切削齿齿厚增大的速度，使磨损后的切削齿能持续保持较薄的齿顶厚，保持切削齿侵入岩石的能力，有利于提高钻头的破岩效率。Alternatively, the outer sides of the bodies on both sides of the PDC composite teeth are cut by concave curves to form PDC composite teeth with a narrow top and wide bottom. In this scheme, the two ends of the PDC combined teeth are cut off by concave curves, which makes the upper part of the PDC combined teeth sharper, which is beneficial for the PDC combined teeth to penetrate into the rock and improve the rock breaking efficiency of the drill bit. At the same time, the PDC combined teeth whose bodies at both ends are cut off by concave curves increase slowly in tooth thickness from the tooth top to the bottom. When the PDC combined teeth are worn, the concave cutting of the two sides of the body can slow down the increase in the thickness of the cutting teeth, so that the worn cutting teeth can continue to maintain a thinner tooth top thickness, and maintain the ability of the cutting teeth to penetrate into rocks. It is beneficial to improve the rock-breaking efficiency of the drill bit.
作为进一步选择，PDC组合齿的两侧本体被多段曲线组合而成的内凹曲线切除，形成上窄下宽结构的PDC组合齿。As a further option, the bodies on both sides of the PDC combined tooth are cut off by a concave curve formed by a combination of multiple curves, forming a PDC combined tooth with a narrow upper part and a wider lower part.
作为另一进一步选择，PDC组合齿的两侧本体被由曲线和直线组合而成的内凹曲线切除，形成上窄下宽结构的PDC组合齿。As another further option, the bodies on both sides of the PDC combined teeth are cut off by a concave curve formed by a combination of curves and straight lines, forming a PDC combined tooth with a narrow upper part and a wider lower part.
前述本发明主方案及其各进一步选择方案可以自由组合以形成多个方案，均为本发明可采用并要求保护的方案；以及本发明的各非冲突选择之间以及和其他选择可以任意组合，本领域技术人员在了解本发明方案后根据现有技术和公知常识可明了有多种组合，均为本发明所要保护的技术方案，在此不做穷举。The above-mentioned main scheme of the present invention and its further options can be freely combined to form multiple schemes, all of which are applicable and claimed in the present invention; and the non-conflicting options of the present invention can be combined arbitrarily with other options, After understanding the solution of the present invention, those skilled in the art can understand that there are various combinations based on the prior art and common knowledge, all of which are technical solutions to be protected by the present invention, and are not exhaustive here.
附图说明Description of drawings
图1为本发明实施例1的结构示意图；Fig. 1 is the structural representation of embodiment 1 of the present invention;
图2为本发明实施例1的PDC组合齿结构示意图；Fig. 2 is a schematic diagram of the structure of the PDC combined teeth of Embodiment 1 of the present invention;
图3为本发明实施例2的PDC组合齿的结构示意图；Fig. 3 is a schematic structural view of a PDC combined tooth according to Embodiment 2 of the present invention;
图4为本发明实施例3的PDC组合齿的结构示意图；Fig. 4 is a schematic structural view of a PDC combined tooth according to Embodiment 3 of the present invention;
图5为单牙轮钻头的牙轮与井底岩石接触时的接触区域划分示意图；Fig. 5 is a schematic diagram of the division of the contact area when the cone of the single cone bit is in contact with the bottom hole rock;
图6为常规PDC齿结构示意图；Fig. 6 is a schematic diagram of a conventional PDC tooth structure;
图7为常规PDC齿正常刮切破岩时的示意图；Fig. 7 is a schematic diagram of conventional PDC teeth when scraping and cutting rock normally;
图中：1、钻头体，2、牙轮，21、恒接触区，22、交替接触区，3、PDC组合齿；31、本体，32、聚晶金刚石层；4、岩石。In the figure: 1. bit body, 2. cone, 21. constant contact area, 22. alternating contact area, 3. PDC combined tooth; 31. body, 32. polycrystalline diamond layer; 4. rock.
具体实施方式detailed description
下列非限制性实施例用于说明本发明。The following non-limiting examples illustrate the invention.
实施例1：Example 1:
参考图1、2所示，一种具有PDC组合齿的单牙轮钻头，包括钻头体1和牙轮2，牙轮2与钻头体1为转动连接，牙轮2上设置有切削齿，牙轮2上的切削齿至少有一颗为PDC组合齿3，作为优选，牙轮2上的切削齿全部为PDC组合齿3(参考图1所示)；PDC组合齿3由两颗PDC齿组合而成，PDC齿由本体31和覆盖本体31整个支撑面的聚晶金刚石层32构成(即图中聚晶金刚石层32覆盖本体31整个端面)，两颗PDC齿的组合方式为聚晶金刚石层32紧密贴合，并由外侧的两本体31夹持呈四层夹心结构，且靠近牙轮部分的厚度大于远离牙轮部分的厚度，参考图2所示，最远离牙轮的尖端部分的两侧本体厚度W1均小于中间聚晶金刚石层厚度W3的2倍，固定于牙轮内的两侧本体厚度W2均大于中间聚晶金刚石层厚度W3的3倍；作为优选，如本实施例所示，PDC组合齿的两侧本体31的外侧被斜切，形成上窄下宽的楔形结构的PDC组合齿。PDC组合齿设置在牙轮上时，PDC组合齿的聚晶金刚石层贴合面的法线与牙轮上该PDC组合齿设置点处的牙轮轮廓曲面的法线的夹角在75-90°之间。Referring to Figures 1 and 2, a single-cone drill bit with PDC combined teeth includes a drill body 1 and a cone 2. The cone 2 is connected to the drill body 1 in rotation. The cone 2 is provided with cutting teeth. At least one of the cutting teeth on the wheel 2 is a PDC combination tooth 3. As a preference, all the cutting teeth on the cone wheel 2 are PDC combination teeth 3 (as shown in Fig. 1); the PDC combination teeth 3 are formed by combining two PDC teeth. The PDC teeth are composed of a body 31 and a polycrystalline diamond layer 32 covering the entire supporting surface of the body 31 (that is, the polycrystalline diamond layer 32 covers the entire end face of the body 31 in the figure), and the combination of the two PDC teeth is a polycrystalline diamond layer 32 Close fit, and clamped by the two outer bodies 31 to form a four-layer sandwich structure, and the thickness of the part close to the cone is greater than the thickness of the part away from the cone, as shown in Figure 2, the two sides of the tip part farthest from the cone The thickness W1 of the body is less than 2 times the thickness W3 of the middle polycrystalline diamond layer, and the thickness W2 of both sides of the body fixed in the cone is greater than 3 times the thickness W3 of the middle polycrystalline diamond layer; as a preference, as shown in this embodiment, The outer sides of the body 31 on both sides of the PDC composite tooth are chamfered to form a wedge-shaped PDC composite tooth with a narrow top and a wide bottom. When the PDC composite tooth is set on the cone, the included angle between the normal of the polycrystalline diamond layer bonding surface of the PDC composite tooth and the normal of the cone contour surface at the setting point of the PDC composite tooth on the cone is 75-90 ° between.
实施例2：Example 2:
本实施例与实施例1基本相同，其区别在于：PDC组合齿的两侧本体31的外侧被内凹曲线切除，形成上窄下宽结构的PDC组合齿。作为选择，参考图3所示，PDC组合齿的两侧本体31被多段曲线组合而成的内凹曲线切除，形成上窄下宽结构的PDC组合齿。This embodiment is basically the same as Embodiment 1, the difference being that the outer sides of the bodies 31 on both sides of the PDC composite teeth are cut by concave curves to form a PDC composite tooth with a narrow top and a wide bottom. As an option, as shown in FIG. 3 , the body 31 on both sides of the PDC composite tooth is cut off by a concave curve formed by a combination of multiple curves, forming a PDC composite tooth with a narrow upper part and a wider lower part.
实施例3：Example 3:
本实施例与实施例1基本相同，其区别在于：PDC组合齿的两侧本体31的外侧被内凹曲线切除，形成上窄下宽结构的PDC组合齿。作为选择，参考图4所示，PDC组合齿的两侧本体31被由曲线和直线组合而成的内凹曲线切除，形成上窄下宽结构的PDC组合齿。This embodiment is basically the same as Embodiment 1, the difference being that the outer sides of the bodies 31 on both sides of the PDC composite teeth are cut by concave curves to form a PDC composite tooth with a narrow top and a wide bottom. As an option, as shown in FIG. 4 , the body 31 on both sides of the PDC composite tooth is cut off by a concave curve formed by a combination of a curve and a straight line, forming a PDC composite tooth with a narrow top and a wide bottom.
实施例4：Example 4:
参考图5所示，本实施例与实施例1至4基本相同，其区别在于：PDC组合齿设置在牙轮2的恒接触区21(牙轮与井底始终接触的区域)上，或者，PDC组合齿设置在牙轮2的交替接触区22(牙轮与井底交替接触的区域)上。Referring to Fig. 5, the present embodiment is basically the same as Embodiments 1 to 4, the difference is that the PDC combined teeth are arranged on the constant contact area 21 of the cone 2 (the area where the cone is always in contact with the bottom of the well), or, The PDC combined teeth are arranged on the alternate contact area 22 of the cone 2 (the area where the cone alternately contacts with the well bottom).
实施例5：Example 5:
本实施例与实施例1至4基本相同，其区别在于：PDC组合齿的聚晶金刚石层平面与过该PDC组合齿设置点的轴平面垂直(即PDC组合齿相对图1中的PDC组合齿旋转90°，图1中的PDC组合齿的聚晶金刚石层平面与过该PDC组合齿设置点的轴平面平行或重合)。This embodiment is basically the same as Embodiments 1 to 4, the difference being that the polycrystalline diamond layer plane of the PDC composite tooth is perpendicular to the axial plane passing the setting point of the PDC composite tooth (that is, the PDC composite tooth is relative to the PDC composite tooth in Fig. 1 Rotate 90°, the polycrystalline diamond layer plane of the PDC composite tooth in Fig. 1 is parallel to or coincident with the axis plane passing through the setting point of the PDC composite tooth).
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610349072.6ACN105804663B (en) | 2016-05-24 | 2016-05-24 | A kind of single-cone rotary drill bit with PDC combination teeth |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610349072.6ACN105804663B (en) | 2016-05-24 | 2016-05-24 | A kind of single-cone rotary drill bit with PDC combination teeth |
| Publication Number | Publication Date |
|---|---|
| CN105804663A CN105804663A (en) | 2016-07-27 |
| CN105804663Btrue CN105804663B (en) | 2018-01-09 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610349072.6AExpired - Fee RelatedCN105804663B (en) | 2016-05-24 | 2016-05-24 | A kind of single-cone rotary drill bit with PDC combination teeth |
| Country | Link |
|---|---|
| CN (1) | CN105804663B (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12084919B2 (en) | 2019-05-21 | 2024-09-10 | Schlumberger Technology Corporation | Hybrid bit |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106639887B (en)* | 2016-11-25 | 2018-09-14 | 西南石油大学 | Rotary teeth single-cone rotary drill bit |
| CN110728076B (en)* | 2019-11-01 | 2022-07-05 | 西南石油大学 | Calculation method of bottom hole rock support dimension |
| CN116601371A (en) | 2020-09-29 | 2023-08-15 | 斯伦贝谢技术有限公司 | Hybrid drill bit |
| CN113405895B (en)* | 2021-05-31 | 2022-11-04 | 西南石油大学 | A anchor clamps for scraping cut and strike compound broken rock test |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US12084919B2 (en) | 2019-05-21 | 2024-09-10 | Schlumberger Technology Corporation | Hybrid bit |
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| CN105804663A (en) | 2016-07-27 |
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| CN105804663B (en) | A kind of single-cone rotary drill bit with PDC combination teeth | |
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