技术领域technical field
本发明属于油气田开发工具领域，具体涉及为一种滑套式水力喷射装置和包括装置的管柱。The invention belongs to the field of oil and gas field development tools, and in particular relates to a sliding sleeve type hydraulic injection device and a pipe string including the device.
背景技术Background technique
在油田或其他钻井的钻探作业中，射孔是目前油气田开发过程中最广泛的完井方式。在一口井钻井、固井完成后，利用射孔器射穿油层套管和水泥环并穿透至油层一定深度，从而建立井筒与地层间的油气流动通道。射孔器的好坏直接影响到射孔完井效果。In oil field or other well drilling operations, perforation is currently the most widely used well completion method in oil and gas field development. After a well is drilled and cemented, the perforator is used to penetrate the casing and cement sheath of the oil layer and penetrate to a certain depth in the oil layer, thereby establishing an oil and gas flow channel between the wellbore and the formation. The quality of the perforator directly affects the effect of perforation and completion.
自上世纪六十年代初以来，水力喷砂射孔器取得了很大的发展。尤其是在储层差异小的均质储层中，使用水力喷射器具有很好的射流压裂效果。但是对于储层应力差异较大的储层，在射流压裂高应力层段时，压裂液很容易进入低应力层段或进入已压层段。Since the early 1960s, hydraulic sandblasting perforators have made great progress. Especially in homogeneous reservoirs with small reservoir differences, the use of hydraulic jets has a good jet fracturing effect. However, for reservoirs with large differences in reservoir stress, when jet fracturing a high-stress layer, the fracturing fluid can easily enter the low-stress layer or into the compressed layer.
发明内容Contents of the invention
针对上述的问题，本发明提出了一种滑套式水力喷射装置和包括装置的管柱。装置避免了在压裂应力差异较大的储层的高应力层段时，压裂液很容易进入低应力层段或进入已压层段的问题，能提高压裂针对性，改善压裂增产效果。同时能实现一趟管柱入井，喷砂射孔环空压裂多段，提高常规多级水力喷射压裂的规模。In view of the above problems, the present invention proposes a slip-on type hydraulic injection device and a pipe string including the device. The device avoids the problem that the fracturing fluid easily enters the low-stress layer or the pressured layer when the fracturing stress varies greatly in the high-stress layer of the reservoir, which can improve the pertinence of fracturing and improve the stimulation of fracturing Effect. At the same time, it can realize one trip of pipe string into the well, sandblasting and perforating annular space fracturing in multiple stages, and increase the scale of conventional multi-stage hydraulic jet fracturing.
根据本发明的一方面，提出了一种滑套式水力喷射装置，其包括：According to an aspect of the present invention, a slip-on type water jetting device is proposed, comprising:
本体，在本体的侧壁上设置喷嘴，a body, a nozzle is provided on the side wall of the body,
下接头，lower connector,
设置在本体和下接头之间的封隔单元，封隔单元具有一端与本体固定连接且另一端与下接头固定连接的中心管，以及环绕式设置在中心管外壁上的胶筒，在中心管的侧壁上设置有连通孔，和The isolation unit is arranged between the body and the lower joint. The isolation unit has a central tube with one end fixedly connected to the main body and the other end fixedly connected to the lower joint, and a rubber cartridge arranged around the outer wall of the central tube. The side wall is provided with communicating holes, and
滑动式设置在本体的内壁上的内滑套，The inner sliding sleeve is slidably arranged on the inner wall of the body,
其中，内滑套构造成在射孔前处于能封堵喷嘴和连通孔的位置处，并且在射孔时能够移动而露出喷嘴和连通孔。Wherein, the inner sliding sleeve is configured to be at a position capable of blocking the nozzle and the communication hole before perforation, and can move to expose the nozzle and the communication hole during perforation.
在进行水力喷射压裂前，内滑套封堵喷嘴和连通孔，在进行水力压裂时，内滑套移动使喷嘴和连通孔露出。高压流体通过喷嘴转化为高速射流液喷射套管和地层，进行喷射压裂作业，同时在喷嘴节流压差作用下，高压流体通过连通孔进入中心管和胶筒形成的空间中，使胶筒膨胀实现封隔装置和管套之间的环空。由此，隔离单元保证压裂液的流动方向，避免压裂液进入低应力层段或进入已压层段，改善了压裂增产效果。并且内滑套同时封堵喷嘴和连通孔，简化了结构，方便了操作。Before the hydraulic jet fracturing, the inner sliding sleeve blocks the nozzle and the communication hole, and when the hydraulic fracturing is performed, the inner sliding sleeve moves to expose the nozzle and the communication hole. The high-pressure fluid is converted into a high-speed jet liquid through the nozzle to spray the casing and the formation for jet fracturing operations. At the same time, under the action of the nozzle throttling pressure difference, the high-pressure fluid enters the space formed by the central tube and the rubber cylinder through the communication hole, so that the rubber cylinder The expansion achieves the annulus between the isolation device and casing. Therefore, the isolation unit ensures the flow direction of the fracturing fluid, prevents the fracturing fluid from entering the low-stress zone or the compressed zone, and improves the fracturing stimulation effect. Moreover, the inner sliding sleeve blocks the nozzle and the communication hole at the same time, which simplifies the structure and facilitates the operation.
在一个实施例中，封隔单元还包括设置在胶筒两端的上护套和下护套，上护套的上端环绕式设置在本体的下端外壁上并与本体固定连接，上护套的下端设置有周向的第一容纳槽，下护套的上端设置有周向的第二容纳槽，下护套的下端环绕式设置在下接头的外壁上。In one embodiment, the sealing unit further includes an upper sheath and a lower sheath arranged at both ends of the rubber tube. A first circumferential accommodation groove is provided, a second circumferential accommodation groove is provided at the upper end of the lower sheath, and the lower end of the lower sheath is arranged on the outer wall of the lower joint in a surrounding manner.
在一个优选的实施例中，胶筒包括中间部分、从中间部分沿轴向向两端延伸的上端部分和下端部分，中间部分的直径大于上端部分和下端部分的直径，并且上端部分和下端部分分别设置在第一容纳槽中和第二容纳槽中。通过这种设置，上护套和下护套起到了压紧胶筒的上端部分和下端部分的作用，在胶筒封隔时，防止胶筒的上端部分和下端部分径向向外突出，从而避免了胶筒封隔过程中的失效，保证了胶筒封隔时的稳定性。In a preferred embodiment, the rubber cartridge includes a middle part, an upper end part and a lower end part extending axially from the middle part to both ends, the diameter of the middle part is larger than the diameter of the upper end part and the lower end part, and the upper end part and the lower end part They are respectively arranged in the first accommodating groove and the second accommodating groove. Through this arrangement, the upper sheath and the lower sheath play the role of pressing the upper end part and the lower end part of the rubber tube, and prevent the upper end part and the lower end part of the rubber tube from protruding radially outward when the rubber tube is sealed, thereby The failure of the rubber cartridge during sealing is avoided, and the stability of the rubber cartridge during sealing is ensured.
优选地，上端部分的轴向尺寸和下端部分的轴向尺寸相同，并与中间部分的轴向尺寸比为1:1～1:3。通过这种设置使得在膨胀过程中胶筒整体受力均衡，从而提高了胶筒封隔效果，增加了装置整体稳定性。Preferably, the axial dimension of the upper end part is the same as that of the lower end part, and the axial dimension ratio of the middle part is 1:1-1:3. Through this setting, the overall force of the rubber tube is balanced during the expansion process, thereby improving the sealing effect of the rubber tube and increasing the overall stability of the device.
在一个实施例中，连通孔临近于胶筒的上端，并构造为多个且在中心管的周向均匀分布。通过这种设置，有利于高压流体从连通孔进入由胶筒和中心管形成的的空间，并使得整个胶筒周向受力均衡，提高胶筒膨胀封隔装置和套管之间的环空的封隔效果。In one embodiment, the communication holes are adjacent to the upper end of the rubber tube, and are configured in multiples and evenly distributed in the circumferential direction of the central tube. Through this arrangement, it is beneficial for the high-pressure fluid to enter the space formed by the rubber sleeve and the central pipe from the communication hole, and to balance the circumferential force of the entire rubber sleeve, and to improve the annular space between the rubber sleeve expansion packing device and the casing the sealing effect.
在一个实施例中，由胶筒的上端部分沿轴向向上延伸出第一连接件，胶筒在第一连接件处与上护套固定连接，由胶筒的下端部分沿轴向向下延伸出第二连接件，胶筒在第二连接件处与下护套固定连接。优选地，第一连接件和第二连接件为金属件，并与胶筒硫化在一起。通过上述设置有利于胶筒与上护套和下护套连接，在胶筒膨胀封隔过程中，在胶筒带动下，下护套相对于中心管向上移动。In one embodiment, a first connecting piece extends axially upward from the upper end of the rubber sleeve, the rubber sleeve is fixedly connected to the upper sheath at the first connecting piece, and extends axially downward from the lower end portion of the rubber sleeve Out of the second connecting piece, the rubber cartridge is fixedly connected with the lower sheath at the second connecting piece. Preferably, the first connecting part and the second connecting part are metal parts, and are vulcanized together with the rubber cartridge. The above arrangement is beneficial to the connection of the rubber sleeve with the upper sheath and the lower sheath. During the expansion and sealing process of the rubber sleeve, driven by the rubber sleeve, the lower sheath moves upward relative to the center pipe.
在一个实施例中，在下接头的内壁上设置径向向内突出的用于定位内滑套的定位台。在内滑套下移过程中，定位台用于承接内滑套并为之轴向定位。并且此种设置结构简单，易于实现。In one embodiment, a positioning platform protruding radially inward for positioning the inner sliding sleeve is provided on the inner wall of the lower joint. During the downward movement of the inner sliding sleeve, the positioning platform is used to receive the inner sliding sleeve and position it axially. Moreover, this arrangement has a simple structure and is easy to implement.
在一个实施例中，内滑套的长度大于喷嘴的上侧壁与连通孔的下侧壁之间的距离。通过这种设置，满足内滑套能同时封堵喷嘴和连通孔，简化了结构。In one embodiment, the length of the inner sliding sleeve is greater than the distance between the upper side wall of the nozzle and the lower side wall of the communication hole. Through this arrangement, the inner sliding sleeve can simultaneously block the nozzle and the communication hole, which simplifies the structure.
根据本发明的另一方面，提供一种管柱，其包括至少一个上述的装置。According to another aspect of the present invention, a pipe string is provided, which includes at least one of the above-mentioned devices.
在一个实施例中，管柱包括两个或两个以上的装置，并从上游到下游的方向上设置的装置的内滑套的内径依次减小。在连接管串时，靠近井筒底部的装置的内滑套的内径小，施工过程中逐级进行投球喷射压裂，实现一趟管柱压裂多段。In one embodiment, the pipe string includes two or more devices, and the inner diameters of the inner sliding sleeves of the devices arranged in the direction from upstream to downstream decrease successively. When connecting pipe strings, the inner diameter of the inner sliding sleeve of the device near the bottom of the wellbore is small. During the construction process, ball-jet fracturing is carried out step by step to achieve multi-stage fracturing in one trip.
本申请中，用语“上”“下”以装置的实际工作方向为参考。In this application, the terms "up" and "down" refer to the actual working direction of the device.
与现有技术相比，本发明包括以下优点。通过在喷嘴的下方设置了封隔单元，在进行水力喷射压裂时，高压流体能进入胶筒和中心管的空间，使胶筒径向膨胀从而封隔装置和套管之间的环空。由此，提高了压裂针对性，避免压裂液进入低应力层段或进入已压层段，改善了压裂增产效果。在一个管柱上设置两个或两个以上的装置时，施工过程中可进行逐级喷射压裂，实现一趟管柱压裂多段。由此，提高了工作效率，降低了操作成本。Compared with the prior art, the present invention includes the following advantages. By installing a packing unit under the nozzle, during hydraulic jet fracturing, high-pressure fluid can enter the space between the rubber sleeve and the central pipe, causing the rubber sleeve to expand radially to seal off the annular space between the sealing device and the casing. As a result, the pertinence of fracturing is improved, the fracturing fluid is prevented from entering the low-stress zone or the zone that has been compressed, and the fracturing stimulation effect is improved. When two or more devices are installed on one pipe string, jet fracturing can be carried out step by step during the construction process, realizing multi-stage fracturing in one pipe string. Thus, the work efficiency is improved and the operation cost is reduced.
附图说明Description of drawings
在下文中将基于实施例并参考附图来对本发明进行更详细的描述。其中：Hereinafter, the present invention will be described in more detail based on the embodiments with reference to the accompanying drawings. in:
图1显示了根据本发明的滑套式水力喷射装置。Figure 1 shows a slip-on hydrojet device according to the invention.
附图并未按照实际的比例绘制。The drawings are not drawn to scale.
具体实施方式Detailed ways
下面将结合附图对本发明做进一步说明。The present invention will be further described below in conjunction with accompanying drawing.
图1显示了根据本发明的滑套式水力喷射装置100。如图1所示，装置100包括本体1、下接头10、内滑套3，以及设置在本体1和下接头10之间的封隔单元20。其中，在本体1的侧壁上设置喷嘴4。封隔单元20具有中心管8和环绕式设置在中心管8的外壁上的胶筒7。中心管8的一端与本体1固定连接，且另一端与下接头10固定连接的。并且在中心管8的侧壁上设置有连通孔81。进行水力压裂前，设置在本体1的内壁上的内滑套3封堵喷嘴4和连通孔81。在进行水力压裂时，内滑套3移动露出喷嘴4和连通孔81。在高压流体通过喷嘴4转化为高速射流液喷射套管和地层，进行喷射压裂作业的同时，高压流体通过连通孔81进入由胶筒7和中心管8形成的空间82中，并使胶筒7径向膨胀，从而封隔装置100和套管(图中未示出)之间的环空。由此提高了压裂针对性，避免压裂液进入低应力层段或进入已压层段，改善了压裂增产效果。Figure 1 shows a slip-on hydrojet apparatus 100 according to the present invention. As shown in FIG. 1 , the device 100 includes a main body 1 , a lower joint 10 , an inner sliding sleeve 3 , and a packing unit 20 arranged between the main body 1 and the lower joint 10 . Wherein, a nozzle 4 is provided on the side wall of the body 1 . The packing unit 20 has a central pipe 8 and a rubber cartridge 7 arranged around the outer wall of the central pipe 8 . One end of the central pipe 8 is fixedly connected to the body 1 , and the other end is fixedly connected to the lower joint 10 . And a communication hole 81 is provided on the side wall of the central pipe 8 . Before hydraulic fracturing, the inner sliding sleeve 3 arranged on the inner wall of the main body 1 blocks the nozzle 4 and the communication hole 81 . When performing hydraulic fracturing, the inner sliding sleeve 3 moves to expose the nozzle 4 and the communication hole 81 . When the high-pressure fluid is converted into a high-speed jet liquid through the nozzle 4 to spray the casing and the formation for jet fracturing, the high-pressure fluid enters the space 82 formed by the rubber cartridge 7 and the central pipe 8 through the communication hole 81, and the rubber cartridge 7 radially expands to seal off the annulus between the isolation device 100 and the casing (not shown). As a result, the pertinence of fracturing is improved, the fracturing fluid is prevented from entering the low-stress zone or the zone that has been compressed, and the effect of fracturing stimulation is improved.
在一个实施例中，封隔单元20还包括设置在胶筒7两端的上护套6和下护套9。在胶筒7封隔过程中，上护套6和下护套9用于防止胶筒7两端径向向外突出。上护套6的上端与本体1固定连接，例如上护套6的上端环绕式套在本体1的外壁上，并通过螺纹连接将本体1拧紧在上护套6的内壁上。下护套9的下端环绕式设置在下接头10的外壁上。In one embodiment, the sealing unit 20 further includes an upper sheath 6 and a lower sheath 9 arranged at both ends of the rubber tube 7 . During the sealing process of the rubber cylinder 7, the upper sheath 6 and the lower sheath 9 are used to prevent the two ends of the rubber cylinder 7 from protruding radially outward. The upper end of the upper sheath 6 is fixedly connected with the body 1 , for example, the upper end of the upper sheath 6 wraps around the outer wall of the body 1 , and the body 1 is screwed onto the inner wall of the upper sheath 6 through threaded connection. The lower end of the lower sheath 9 is circumferentially disposed on the outer wall of the lower joint 10 .
在一个优选的实施例中，胶筒7包括中间部分72、从中间部分72向两端轴向延伸的上端部分71和下端部分73。优选地，为了制造方便，上端部分71轴向尺寸与下端部分73的轴向尺寸相等，而与中间部分72的轴向尺寸与比为1:1～1:3。且中间部分72的直径大于上端部分71和下端部分73的直径。相应地，在上护套6的下端内壁上设置周向的第一容纳槽61。在下护套9的上端内壁上设置周向的第二容纳槽91。其中，胶筒7的上端部分71容纳在第一容纳槽61中。而胶筒7的下端部分73容纳在第二容纳槽91中。由此，上护套6和下护套9起到了压紧胶筒7的上端部分71和下端部分73的作用，防止胶筒的上端部分71和下端部分73径向向外突出，从而避免了胶筒7封隔过程中的失效。并且，在喷射压裂过程中，胶筒7的中间部分72径向向外膨胀，起到了封隔环空的作用。通过上述设置，使得胶筒7整体受力均匀，从而提高了封隔效果，增加了装置100的工作稳定性。In a preferred embodiment, the rubber cartridge 7 includes a middle portion 72 , an upper end portion 71 and a lower end portion 73 axially extending from the middle portion 72 to both ends. Preferably, for the convenience of manufacture, the axial dimension of the upper end portion 71 is equal to that of the lower end portion 73 , and the ratio of the axial dimension to the middle portion 72 is 1:1˜1:3. And the diameter of the middle portion 72 is larger than the diameters of the upper end portion 71 and the lower end portion 73 . Correspondingly, a circumferential first accommodation groove 61 is provided on the inner wall of the lower end of the upper sheath 6 . A circumferential second receiving groove 91 is provided on the inner wall of the upper end of the lower sheath 9 . Wherein, the upper end portion 71 of the rubber cartridge 7 is accommodated in the first receiving groove 61 . And the lower end portion 73 of the rubber cartridge 7 is accommodated in the second receiving groove 91 . Thus, the upper sheath 6 and the lower sheath 9 play the role of pressing the upper end portion 71 and the lower end portion 73 of the rubber cylinder 7, preventing the upper end portion 71 and the lower end portion 73 of the rubber cylinder from protruding radially outward, thereby avoiding The failure of the rubber cartridge 7 in the sealing process. Moreover, during the jet fracturing process, the middle part 72 of the rubber cartridge 7 expands radially outward, which plays a role of sealing off the annular space. Through the above arrangement, the overall force on the rubber cartridge 7 is uniform, thereby improving the sealing effect and increasing the working stability of the device 100 .
需要说明地是，上端部分71和下端部分73的轴向尺寸也可以不相等。It should be noted that the axial dimensions of the upper end portion 71 and the lower end portion 73 may also be unequal.
在一个实施例中，胶筒7的上端部分71沿轴向向上延伸出第一连接件11。由胶筒7的下端部分73沿轴向向下延伸出第二连接件12。优选地，第一连接件11和第二连接件12均为金属件，并与胶筒7硫化在一起。从而使得胶筒7在第一连接件11处与上护套6固定连接。胶筒7在第二连接件12处与下护套9固定连接。通过这种连接将上护套6、胶筒7和下护套9连接在了一起。在胶筒7膨胀封隔过程中，胶筒7的中间部分72径向向外膨胀，从而带动下护套9上移。并且，在下护套9与下接头10之间设置密封件13，用于实现护套9与下接头10之间的密封。同时，此密封件13在下护套9相对于下接头10运动过程中，一直起到密封作用。In one embodiment, the upper end portion 71 of the rubber cartridge 7 extends axially upwards out of the first connecting member 11 . The second connecting piece 12 extends axially downward from the lower end portion 73 of the rubber barrel 7 . Preferably, both the first connecting part 11 and the second connecting part 12 are metal parts, and are vulcanized together with the rubber cartridge 7 . Thus, the rubber cartridge 7 is fixedly connected to the upper sheath 6 at the first connecting member 11 . The rubber cartridge 7 is fixedly connected with the lower sheath 9 at the second connecting piece 12 . Through this connection, the upper sheath 6, the rubber cartridge 7 and the lower sheath 9 are connected together. During the expansion and sealing process of the rubber sleeve 7 , the middle part 72 of the rubber sleeve 7 expands radially outward, thereby driving the lower sheath 9 to move upward. Moreover, a seal 13 is provided between the lower sheath 9 and the lower joint 10 to realize the sealing between the sheath 9 and the lower joint 10 . At the same time, the sealing member 13 always plays a sealing role during the movement of the lower sheath 9 relative to the lower joint 10 .
优选地，连通孔81临近于胶筒7的上端，用于高压流体通过连通孔81向下流动，从而为胶筒7施压使之径向膨胀。进一步优选地，连通孔81设置为多个，并在中心管8的周向均匀分布(图中未示出)，从而使胶筒7的中间部分72在周向上受力均匀，提高胶筒7膨胀封隔装置100和套管之间的环空的封隔效果。更进一步优选地，连通孔81构造为沿轴向的长方形孔(图中未示出)，其结构简单，加工方便。同时有利于高压液体进入胶筒7与中心管8的空间82。Preferably, the communication hole 81 is adjacent to the upper end of the rubber cartridge 7 , for the high-pressure fluid to flow downward through the communication hole 81 , so as to pressurize the rubber cartridge 7 to radially expand. Further preferably, a plurality of communication holes 81 are provided and distributed evenly in the circumferential direction of the central pipe 8 (not shown in the figure), so that the middle part 72 of the rubber tube 7 is evenly stressed in the circumferential direction, and the rubber tube 7 is improved. The sealing effect of the annulus between the expandable isolation device 100 and the casing. Further preferably, the communicating hole 81 is configured as an axially oblong hole (not shown in the figure), which has a simple structure and is easy to process. At the same time, it is beneficial for the high-pressure liquid to enter the space 82 between the rubber cartridge 7 and the central tube 8 .
在下接头10的内壁上设置用于定位内滑套3的定位台19。定位台19构造为由下接头10的内壁径向向内突出的台阶状。在内滑套3下移过程中，定位台19用于承接内滑套3并为之轴向定位。此种设置结构简单，易于实现。A positioning table 19 for positioning the inner sliding sleeve 3 is provided on the inner wall of the lower joint 10 . The positioning platform 19 is configured as a step protruding radially inward from the inner wall of the lower joint 10 . During the downward movement of the inner sliding sleeve 3, the positioning platform 19 is used for receiving the inner sliding sleeve 3 and positioning it axially. This arrangement is simple in structure and easy to implement.
内滑套3的长度大于喷嘴4的上侧壁与连通孔81的下侧壁之间的距离，并通过剪切销钉5固定在本体1的内壁上。也就是，在射孔前，内滑套3的长度使其上端能轴向延伸到喷嘴4之上，并且其下端能轴向延伸到连通孔81之下，用于封堵喷嘴4和连通孔81。The length of the inner sliding sleeve 3 is greater than the distance between the upper side wall of the nozzle 4 and the lower side wall of the communication hole 81 , and is fixed on the inner wall of the body 1 by the shear pin 5 . That is, before perforation, the length of the inner sliding sleeve 3 is such that its upper end can extend axially above the nozzle 4, and its lower end can axially extend below the communication hole 81 for blocking the nozzle 4 and the communication hole 81.
在本体1的上端外壁上与下接头10的下端外壁上均设置有外螺纹(图中未示出)。通过这种设置方便了本体1和下接头10与其它部件的连接，并且互换性强，也便于拆卸。External threads (not shown in the figure) are both provided on the outer wall of the upper end of the body 1 and the outer wall of the lower end of the lower joint 10 . This arrangement facilitates the connection of the main body 1 and the lower joint 10 with other components, and is highly interchangeable and easy to disassemble.
在内滑套3的内壁上设置球座31，用于与封堵球配合。在装置100入井到设计喷射位置后，投入一个与球座31匹配的封堵球，进行打压，剪断剪切销钉5，内滑套3下移到定位台19处。如此，喷嘴4连通了装置100内外，高压流体通过喷嘴4转化为高速射流喷射套管和地层，进行喷射压裂作业，同时，中心管8上端的连通孔81连通了装置100的内腔与中心管8和胶筒7形成的空间82，在喷嘴4前后节流压差作用下，胶筒7膨胀封隔环空。A ball seat 31 is arranged on the inner wall of the inner sliding sleeve 3 for cooperating with the blocking ball. After the device 100 enters the well and reaches the designed injection position, a plugging ball matched with the ball seat 31 is put in to pressurize, the shear pin 5 is cut off, and the inner sliding sleeve 3 moves down to the positioning table 19. In this way, the nozzle 4 communicates with the inside and outside of the device 100, and the high-pressure fluid is converted into a high-speed jet through the nozzle 4 to spray the casing and the formation to perform jet fracturing operations. At the same time, the communication hole 81 at the upper end of the center pipe 8 communicates with the inner cavity of the device 100 and the center. In the space 82 formed by the tube 8 and the rubber cartridge 7, the rubber cartridge 7 expands and seals off the annular space under the action of the throttle pressure difference between the front and rear of the nozzle 4.
在一趟管柱中(图中未示出)可以连接至少一个装置100。若一趟管柱连接两个或两个装置100，每套装置100的内滑套3的内通径不同，并且从上游到下游的方向上设置的装置100的内滑套3的内径依次减小。即在连接管串时，靠进井筒底部的装置100的内滑套3的内通径小，然后逐级往上内滑套3的内通径逐级增大。施工时逐级进行投球喷射压裂，实现一趟管柱压裂多段。从而提高多级水力喷射压裂的规模。提高了工作效率，降低了操作成本。At least one device 100 can be connected in one trip (not shown in the figure). If two or two devices 100 are connected in one trip, the inner diameters of the inner sliding sleeves 3 of each device 100 are different, and the inner diameters of the inner sliding sleeves 3 of the devices 100 arranged in the direction from upstream to downstream are successively reduced. Small. That is, when the pipe strings are connected, the inner diameter of the inner sliding sleeve 3 of the device 100 that enters the bottom of the wellbore is small, and then the inner diameter of the inner sliding sleeve 3 increases step by step. During the construction, ball jet fracturing is carried out step by step to achieve multi-stage fracturing in one string. Thereby increasing the scale of multi-stage hydraulic jet fracturing. Improve work efficiency and reduce operating costs.
虽然已经参考优选实施例对本发明进行了描述，但在不脱离本发明的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。本发明并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the invention. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410268164.2ACN105201476B (en) | 2014-06-16 | 2014-06-16 | A kind of sleeve type hydraulic jeting device and the tubing string including device |
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| CN105201476Atrue CN105201476A (en) | 2015-12-30 |
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| CN201410268164.2AActiveCN105201476B (en) | 2014-06-16 | 2014-06-16 | A kind of sleeve type hydraulic jeting device and the tubing string including device |
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