技术领域technical field
本发明涉及煤炭地下气化技术领域，尤其涉及一种煤炭地下气化进、出气孔结构。The invention relates to the technical field of underground coal gasification, in particular to an underground coal gasification inlet and outlet hole structure.
背景技术Background technique
煤炭地下气化技术中，最小的实体有机质气化单元由进气孔、出气孔和气化通道组成，进气孔将气化剂输送到有机质中，与高温的有机质发生氧化、还原及热解等反应，产生的煤气经过气化通道01由出气孔02导出地面03进行进一步的利用，随着气化剂与有机质的反应，进气孔04端形成的空腔会越来越大，出气孔02的温度会越来越高，煤炭地下气化技术的整体结构如图1所示，03为气化通道，02为出气孔，03为地面，04为进气孔，图中的箭头表示煤气流路。In the underground coal gasification technology, the smallest solid organic matter gasification unit is composed of an air inlet, an air outlet, and a gasification channel. The air inlet transports the gasification agent into the organic matter, and oxidizes, reduces, and pyrolyzes with the high-temperature organic matter, etc. Reaction, the generated coal gas passes through the gasification channel 01 and is exported to the ground 03 from the gas outlet 02 for further utilization. With the reaction of the gasification agent and the organic matter, the cavity formed at the end of the gas inlet 04 will become larger and larger, and the gas outlet 02 The temperature will be higher and higher. The overall structure of underground coal gasification technology is shown in Figure 1. 03 is the gasification channel, 02 is the air outlet, 03 is the ground, and 04 is the air inlet. The arrows in the figure indicate the gas flow road.
为了保证钻孔在底部冒落或在温度上升发生套管膨胀伸缩后上部含水层的水不与气化煤层导通，现有技术中是在钻孔套管外壁与周围岩层通过固井水泥封死，如图2所示，其中05为套管，06为含水层，07为气化煤层，08为固井水泥，09为岩层。In order to ensure that the water in the upper aquifer does not communicate with the gasified coal seam after the borehole collapses at the bottom or the casing expands and contracts when the temperature rises, in the prior art, the outer wall of the borehole casing and the surrounding rock formations are sealed with cementing cement. Die, as shown in Figure 2, where 05 is casing, 06 is aquifer, 07 is gasified coal seam, 08 is cementing cement, and 09 is rock formation.
现有技术的钻孔在地层不发生错落，或钻孔套管没有大的温度变化不引起套管05伸缩的情况下，可以保证上部含水层06的水不会导入气化煤层07中。但是当地层发生错落或者套管05伸缩时，经常会使固井水泥08松动、脱落甚至是套管05被拉断，且发生故障的位置是在含水层06或含水层06以下。这样就会导致含水层06的承压水通过断口经套管导入气化煤层07，或者是导致含水层06的承压水通过破坏后的固井水泥层导入炉内，造成气化炉的温度下降，不会产生高热值的煤气，严重时会导致气化炉熄火，被迫中断气化。The drilling holes in the prior art can ensure that the water in the upper aquifer 06 will not be introduced into the gasified coal seam 07 if the formation does not stray, or the drilling casing does not have a large temperature change that does not cause the casing 05 to expand and contract. However, when the formation is scattered or the casing 05 is stretched, the cement 08 will often loosen, fall off or even the casing 05 will be pulled off, and the location of the failure is in the aquifer 06 or below the aquifer 06. This will cause the pressurized water in the aquifer 06 to enter the gasification coal seam 07 through the fracture through the casing, or cause the pressurized water in the aquifer 06 to enter the furnace through the damaged cement layer, causing the temperature of the gasifier Decline, will not produce high calorific value of the gas, in serious cases will cause the gasifier to shut down, forced to stop the gasification.
发明内容Contents of the invention
本发明的实施例提供一种煤炭地下气化进、出气孔结构，可以避免含水层的水进入炉内，影响正常气化或导致气化炉熄火。Embodiments of the present invention provide an underground coal gasification inlet and outlet hole structure, which can prevent water in the aquifer from entering the furnace, affecting normal gasification or causing the gasifier to shut down.
为达到上述目的，本发明的实施例采用如下技术方案：In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:
一种煤炭地下气化进、出气孔结构，包括开设于地面且与待气化煤层连通的安装孔，所述安装孔包括彼此连通的上套管安装孔和下套管安装孔，所述上套管安装孔穿过含水层设置，所述上套管安装孔内固定连接有上套管，所述下套管安装孔内自由穿设有下套管，所述下套管上端配合穿设于所述上套管内，且所述下套管可沿所述上套管内壁自由滑动。An underground coal gasification gas inlet and outlet hole structure, including installation holes opened on the ground and connected to the coal seam to be gasified, the installation holes include an upper casing installation hole and a lower casing installation hole communicating with each other, the upper The sleeve installation hole is set through the aquifer, the upper sleeve installation hole is fixedly connected with the upper sleeve, the lower sleeve installation hole is freely pierced with a lower sleeve, and the upper end of the lower sleeve is threaded inside the upper sleeve, and the lower sleeve can slide freely along the inner wall of the upper sleeve.
进一步地，所述上套管通过固井水泥环与所述上套管安装孔连接。Further, the upper casing is connected to the installation hole of the upper casing through a cement sheath.
进一步地，所述上套管的下表面位于距离待气化煤层最近的含水层以下。Further, the lower surface of the upper casing is located below the aquifer closest to the coal seam to be gasified.
更进一步地，所述上套管的下表面与所述含水层的距离大于5米。Furthermore, the distance between the lower surface of the upper casing and the aquifer is greater than 5 meters.
进一步地，所述上套管的下表面与待气化煤层顶面的距离大于待气化煤层厚度的5倍。Further, the distance between the lower surface of the upper casing and the top surface of the coal seam to be gasified is greater than 5 times the thickness of the coal seam to be gasified.
进一步地，所述上套管的下端设有第一限位件，所述下套管的上端对应所述第一限位件设有第二限位件，所述第一限位件和所述第二限位件可阻止所述下套管的上端与所述上套管的下端脱离。Further, the lower end of the upper sleeve is provided with a first limiter, and the upper end of the lower sleeve is provided with a second limiter corresponding to the first limiter, and the first limiter and the The second limiting member can prevent the upper end of the lower sleeve from disengaging from the lower end of the upper sleeve.
进一步地，所述第一限位件为设置于所述上套管的下端内壁上的卡环，所述第二限位件为设置于所述下套管的上端外壁上的卡环或阶梯状凸台环。Further, the first limiting member is a snap ring arranged on the inner wall of the lower end of the upper casing, and the second limiting member is a snap ring or a step arranged on the outer wall of the upper end of the lower casing shaped boss ring.
进一步地，所述第一限位件为均匀布置于所述上套管的下端内壁一周的卡环段，所述第二限位件为设置于所述下套管的上端外壁上的卡环；Further, the first limiting member is a clasp segment evenly arranged on the inner wall of the lower end of the upper casing, and the second limiting member is a snap ring arranged on the outer wall of the upper end of the lower casing ;
或所述第一限位件为设置于所述上套管的下端内壁上的卡环，所述第二限位件为均匀布置于所述下套管的上端外壁一周的卡环段。Or the first limiting member is a snap ring arranged on the inner wall of the lower end of the upper casing, and the second limiting member is a snap ring segment evenly arranged around the outer wall of the upper end of the lower casing.
进一步地，所述第一限位件为设置于所述上套管的下端内壁上的阶梯状凸台环，所述第二限位件为设置于所述下套管的上端外壁上的卡环或阶梯状凸台环。Further, the first limiting member is a stepped boss ring arranged on the inner wall of the lower end of the upper casing, and the second limiting member is a snap ring arranged on the outer wall of the upper end of the lower casing. ring or stepped boss ring.
进一步地，所述卡环的限位面为斜面。本发明实施例提供的煤炭地下气化进、出气孔结构，上套管安装孔穿过含水层设置，由于上套管安装孔内固定连接有上套管，下套管安装孔内自由穿设有下套管，下套管在热胀冷缩的情况下可以在上套管内壁自由滑动，使得下套管受地层冒落的影响作用减小，对上套管产生外力的影响作用也减小，避免煤层顶板发生冒落时，地层错动拉断套管，含水层的水经套管的断口导入炉内，保证了钻孔的正常进出气，进而确保了煤炭地下气化过程的正常进行。Further, the limiting surface of the snap ring is an inclined surface. In the underground coal gasification inlet and outlet hole structure provided by the embodiment of the present invention, the upper casing installation hole is set through the aquifer. Since the upper casing installation hole is fixedly connected with the upper casing, the lower casing installation hole is freely pierced With the lower casing, the lower casing can freely slide on the inner wall of the upper casing under the condition of thermal expansion and cold contraction, so that the lower casing is less affected by the formation caving, and the influence of the external force on the upper casing is also reduced. Small size, to prevent the coal seam roof from falling, the stratum shifts and breaks the casing, and the water in the aquifer is introduced into the furnace through the fracture of the casing, ensuring the normal gas in and out of the borehole, and thus ensuring the normal underground coal gasification process conduct.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.
图1为现有技术煤炭地下气化结构的整体示意图；Fig. 1 is the overall schematic diagram of prior art underground coal gasification structure;
图2为现有技术钻孔结构的示意图；Fig. 2 is the schematic diagram of prior art drilling structure;
图3为本发明实施例煤炭地下气化进、出气孔结构的整体结构示意图；3 is a schematic diagram of the overall structure of the gas inlet and outlet holes of underground coal gasification according to an embodiment of the present invention;
图4为本发明实施例煤炭地下气化进、出气孔结构中第一限位件和第二限位件采用卡环的结构示意图；Fig. 4 is a schematic diagram of the structure of the first limiting member and the second limiting member using snap rings in the structure of the inlet and outlet holes of the underground coal gasification according to the embodiment of the present invention;
图5为本发明实施例煤炭地下气化进、出气孔结构中第一限位件和第二限位件的卡环的限位面采用斜面结构的示意图；Fig. 5 is a schematic diagram showing that the limiting surfaces of the snap rings of the first limiting member and the second limiting member in the structure of the inlet and outlet holes of the underground coal gasification according to the embodiment of the present invention adopt a slope structure;
图6为本发明实施例煤炭地下气化进、出气孔结构中第一限位件采用卡环段的结构示意图；Fig. 6 is a schematic diagram of the structure of the first limiting member adopting the clasp section in the structure of the inlet and outlet holes of the underground coal gasification according to the embodiment of the present invention;
图7为本发明实施例煤炭地下气化进、出气孔结构中第二限位件采用卡环段的结构示意图；Fig. 7 is a structural schematic diagram of the second limiting member adopting the clasp section in the structure of the inlet and outlet holes of the underground coal gasification according to the embodiment of the present invention;
图8为本发明实施例煤炭地下气化进、出气孔结构中上套管下端采用斜面结构的限位面、下套管上端采用卡环段的结构示意图；Fig. 8 is a structural schematic diagram of the structure of the inlet and outlet holes of the underground coal gasification in the embodiment of the present invention, where the lower end of the upper casing adopts the limit surface of the slope structure, and the upper end of the lower casing adopts the snap ring section;
图9为本发明实施例煤炭地下气化进、出气孔结构中上套管下端采用卡环段结构、下套管上端采用斜面结构的限位面的示意图；Fig. 9 is a schematic diagram of a limit surface in which the lower end of the upper casing adopts a clasp section structure and the upper end of the lower casing adopts a slope structure in the structure of the inlet and outlet holes of the underground coal gasification according to the embodiment of the present invention;
图10为本发明实施例煤炭地下气化进、出气孔结构中第一限位件和第二限位件均采用阶梯状凸台环的结构示意图；Fig. 10 is a schematic diagram of the structure of the first stopper and the second stopper in the structure of the inlet and outlet holes of the underground coal gasification according to the embodiment of the present invention;
图11为本发明实施例煤炭地下气化进、出气孔结构中第一限位件采用阶梯状凸台环、第二限位件采用限位面为斜面结构卡环的结构示意图；Fig. 11 is a schematic diagram of the structure of the structure of the inlet and outlet holes of underground coal gasification according to the embodiment of the present invention, in which the first limiting member adopts a stepped boss ring, and the second limiting member adopts a retaining ring whose limiting surface is an inclined plane structure;
图12为本发明实施例煤炭地下气化进、出气孔结构中第一限位件采用限位面为斜面结构卡环、第二限位件采用阶梯状凸台环的结构示意图。Fig. 12 is a structural schematic diagram of the structure of the inlet and outlet holes of the underground coal gasification according to the embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图对本发明实施例煤炭地下气化进、出气孔结构进行详细描述。The structure of the inlet and outlet holes of the underground coal gasification of the embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.
在本发明的描述中，需要理解的是，术语“中心”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。In describing the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the invention.
术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本发明的描述中，除非另有说明，“多个”的含义是两个或两个以上。The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明中的具体含义。In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.
图3为本发明实施例煤炭地下气化进、出气孔结构的一个具体实施例，本实施例煤炭地下气化进、出气孔结构，包括开设于地面且与待气化煤层连通的安装孔，安装孔包括彼此连通的上套管安装孔和下套管安装孔，上套管安装孔为从地面穿过含水层到含水层以下岩层之间的孔，下套管安装孔为从含水层以下岩层到待气化煤层之间的孔，上套管安装孔内固定连接有上套管1，下套管安装孔内自由穿设有下套管2，下套管2上端配合穿设于上套管1内，且下套管2可沿上套管1内壁自由滑动。Fig. 3 is a specific embodiment of the structure of the inlet and outlet holes of the underground coal gasification of the embodiment of the present invention. The structure of the inlet and outlet holes of the underground coal gasification of this embodiment includes installation holes opened on the ground and connected with the coal seam to be gasified. The installation hole includes an upper casing installation hole and a lower casing installation hole connected to each other. The upper casing installation hole is a hole from the ground through the aquifer to the rock formation below the aquifer, and the lower casing installation hole is a hole from the aquifer below the aquifer. For the hole between the rock formation and the coal seam to be gasified, the upper casing 1 is fixedly connected in the installation hole of the upper casing, and the lower casing 2 is freely pierced in the installation hole of the lower casing. Inside the casing 1, and the lower casing 2 can slide freely along the inner wall of the upper casing 1.
本发明的实施例提供的煤炭地下气化进、出气孔结构，上套管安装孔穿过含水层设置，由于上套管安装孔内固定连接有上套管1，下套管安装孔内自由穿设有下套管2，下套管2在热胀冷缩的情况下可以在上套管1内壁自由滑动，使得下套管2受地层冒落的影响作用减小，对上套管1产生外力的影响作用也减小，避免煤层顶板发生冒落时，地层错动拉断套管，含水层的水经套管的断口导入炉内，保证了钻孔的正常进出气，进而确保了煤炭地下气化过程的正常进行。In the underground coal gasification inlet and outlet hole structure provided by the embodiment of the present invention, the upper casing installation hole is set through the aquifer. Since the upper casing installation hole is fixedly connected with the upper casing 1, the lower casing installation hole is free The lower casing 2 is pierced, and the lower casing 2 can slide freely on the inner wall of the upper casing 1 under the condition of thermal expansion and cold contraction, so that the lower casing 2 is less affected by the formation caving, and the upper casing 1 The influence of external force is also reduced, so as to prevent the strata from breaking the casing when the roof of the coal seam falls. The normal operation of underground coal gasification process.
为确保气化过程的正常进行，如图3所示，将上套管1通过固井水泥环5与上套管1安装孔连接。固井水泥凝固后形成的固井水泥环5可以用来固定上套管1与周围岩层31，保证含水层4被固定死，避免含水层4的水进入炉内，阻止进、出气孔结构的正常进出气，影响煤炭地下气化过程的正常进行。并且下套管2与周围岩层32未采用固井水泥环5固定，仅仅通过岩层32的收缩应力自动固定，由此使下套管2与周围岩层32的附着力较小，在受热胀冷缩或地层冒落拉伸时，对下套管2的破坏力较低。In order to ensure the normal progress of the gasification process, as shown in FIG. 3 , the upper casing 1 is connected to the installation hole of the upper casing 1 through the cement sheath 5 . The cement sheath 5 formed after the cement is solidified can be used to fix the upper casing 1 and the surrounding rock formation 31, to ensure that the aquifer 4 is fixed, to prevent the water in the aquifer 4 from entering the furnace, and to prevent the structure of the inlet and outlet pores from collapsing. Normal gas in and out affects the normal progress of the underground coal gasification process. In addition, the lower casing 2 and the surrounding rock formation 32 are not fixed by the cement sheath 5, but are automatically fixed only by the shrinkage stress of the rock formation 32, so that the adhesion between the lower casing 2 and the surrounding rock formation 32 is small, and the expansion and contraction when heated Or when the stratum falls and stretches, the destructive power to the lower casing 2 is relatively low.
为确保不同地层结构下煤炭地下气化过程均正常进行，需要考虑上套管1的位置设计，上套管1的位置设计与上套管1的下表面与含水层4的距离、上套管1的下表面与待气化煤层6顶面的距离以及待气化煤层6的厚度都有关系。如图3所示，由于上套管1的下端与其周围岩层31处是最容易导水的部位，也是上套管安装孔最薄弱的部分，可以将上套管1的下表面设计在距离待气化煤层6最近的含水层4以下，且上套管1的下表面与含水层4的距离设计为大于5米，并且上套管1全部通过固井水泥环5与上套管安装孔连接，可以保证含水层4被固定死，减小距离待气化煤层6最近的含水层4的水进入待气化煤层6的可能性；由于含水层4与待气化煤层6之间的地层太薄，随着待气化煤层6气化过程的进行，该地层失去支撑，发生冒落，所产生的地应力会对上、下套管造成破坏，从而拉断套管，使得含水层4的水进入炉内，因此，需考虑将上套管1的下表面与待气化煤层6顶面的距离设计较大一些，实践证明，将上套管1的下表面与待气化煤层6顶面的距离设计为大于待气化煤层6厚度的5倍时，可以避免含水层4与待气化煤层6之间的地层发生冒落，确保待气化煤层6气化过程的正常进行。In order to ensure that the underground coal gasification process under different strata structures is carried out normally, it is necessary to consider the position design of the upper casing 1, the position design of the upper casing 1, the distance between the lower surface of the upper casing 1 and the aquifer 4, and the The distance between the lower surface of 1 and the top surface of the coal seam 6 to be gasified and the thickness of the coal seam 6 to be gasified are all related. As shown in Figure 3, since the lower end of the upper casing 1 and its surrounding rock formation 31 are the most easily water-conducting parts and the weakest part of the upper casing installation hole, the lower surface of the upper casing 1 can be designed at a distance of The gasification coal seam 6 is below the nearest aquifer 4, and the distance between the lower surface of the upper casing 1 and the aquifer 4 is designed to be greater than 5 meters, and the upper casing 1 is all connected to the installation hole of the upper casing through the cement sheath 5 , it can ensure that the aquifer 4 is fixed, reducing the possibility of the water in the aquifer 4 closest to the coal seam 6 to be gasified entering into the coal seam 6 to be gasified; As the gasification process of the coal seam 6 to be gasified proceeds, the formation loses its support and caving occurs, and the generated ground stress will damage the upper and lower casings, thereby breaking the casings and making the aquifer 4 Water enters the furnace. Therefore, it is necessary to design a larger distance between the lower surface of the upper casing 1 and the top surface of the coal seam 6 to be gasified. Practice has proved that the lower surface of the upper casing 1 and the top surface of the coal seam 6 to be gasified When the distance between the planes is designed to be greater than 5 times the thickness of the coal seam 6 to be gasified, caving of the strata between the aquifer 4 and the coal seam 6 to be gasified can be avoided, ensuring the normal progress of the gasification process of the coal seam 6 to be gasified.
如上述实施例所述，可以将上套管1的下表面与含水层4的距离设计为6米，并且上套管1全部通过固井水泥环5与上套管安装孔连接，可以保证含水层4被固定死，减小距离待气化煤层6最近的含水层4的水进入待气化煤层6的可能性；当待气化煤层6的厚度为7米时，可将上套管1的下表面与待气化煤层6顶面的距离设计为42米，以使得上套管1的下表面与待气化煤层6顶面的距离大于待气化煤层6厚度的5倍，可以避免含水层4与待气化煤层6之间的地层发生冒落，确保待气化煤层6气化过程的正常进行。As described in the above-mentioned embodiment, the distance between the lower surface of the upper casing 1 and the aquifer 4 can be designed to be 6 meters, and the upper casing 1 is all connected to the installation hole of the upper casing through the cement sheath 5, which can ensure the water content. Layer 4 is fixed to reduce the possibility of the water in the aquifer 4 closest to the coal seam 6 to be gasified entering into the coal seam 6 to be gasified; when the thickness of the coal seam 6 to be gasified is 7 meters, the upper casing 1 The distance between the lower surface of the casing 1 and the top surface of the coal seam 6 to be gasified is designed to be 42 meters, so that the distance between the lower surface of the upper casing 1 and the top surface of the coal seam 6 to be gasified is greater than 5 times the thickness of the coal seam 6 to be gasified, which can avoid Caving occurs in the strata between the aquifer 4 and the coal seam 6 to be gasified, ensuring the normal progress of the gasification process of the coal seam 6 to be gasified.
具体的，还可以将上套管1的下表面与含水层4的距离设计为10米，并且上套管1全部通过固井水泥环5与上套管安装孔连接，可以保证含水层4被固定死，减小距离待气化煤层6最近的含水层4的水进入待气化煤层6的可能性；当待气化煤层6的厚度为6米时，可将上套管1的下表面与待气化煤层6顶面的距离设计为40米，以使得上套管1的下表面与待气化煤层6顶面的距离大于待气化煤层6厚度的5倍，可以避免含水层4与待气化煤层6之间的地层发生冒落，确保待气化煤层6气化过程的正常进行。Specifically, the distance between the lower surface of the upper casing 1 and the aquifer 4 can also be designed to be 10 meters, and the upper casing 1 is all connected with the upper casing installation hole through the cement sheath 5, which can ensure that the aquifer 4 is fixed to reduce the possibility of the water in the aquifer 4 closest to the coal seam 6 to be gasified entering into the coal seam 6 to be gasified; when the thickness of the coal seam 6 to be gasified is 6 meters, the lower surface of the upper casing 1 can be The distance from the top surface of the coal seam 6 to be gasified is designed to be 40 meters, so that the distance between the lower surface of the upper casing 1 and the top surface of the coal seam 6 to be gasified is greater than 5 times the thickness of the coal seam 6 to be gasified, and the aquifer 4 can be avoided. The strata between the coal seam 6 to be gasified and the coal seam 6 to be gasified are caving to ensure the normal progress of the gasification process of the coal seam 6 to be gasified.
由于下套管2在地层应力作用下在上套管1内可以自由伸缩，同时下套管2可以在其周围岩层32内自由伸缩，如图3所示，为阻止下套管2的上端与上套管1的下端脱离，在上套管1的下端设有第一限位件11，下套管2的上端对应第一限位件11设有第二限位件21，第一限位件11和第二限位件21可以将上、下套管悬挂连接，进而阻止上、下套管脱离，起到给下套管2限位的作用，保证下套管2不会掉入炉内，确保待气化煤层6气化过程的正常进行。Since the lower casing 2 can freely expand and contract in the upper casing 1 under the action of formation stress, and at the same time the lower casing 2 can freely expand and contract in the surrounding rock formation 32, as shown in Figure 3, in order to prevent the upper end of the lower casing 2 from The lower end of the upper sleeve 1 is disengaged, and the lower end of the upper sleeve 1 is provided with a first limiter 11, and the upper end of the lower sleeve 2 is provided with a second limiter 21 corresponding to the first limiter 11. The first limiter The part 11 and the second limiting part 21 can hang and connect the upper and lower casings, thereby preventing the upper and lower casings from detaching, and play the role of limiting the lower casing 2 to ensure that the lower casing 2 will not fall into the furnace. In order to ensure the normal progress of the gasification process of the coal seam 6 to be gasified.
具体的，如图4所示，可以将第一限位件11设计为设置于上套管1的下端内壁上的卡环，第二限位件21设计为设置于下套管2的上端外壁上的卡环，这种卡环结构可以将上、下套管悬挂连接，进而阻止上、下套管脱离，起到给下套管2限位的作用，以防止下套管2掉入炉内，影响待气化煤层6气化过程的正常进行，同时，卡环加工简单，易于实现。Specifically, as shown in FIG. 4 , the first stopper 11 can be designed as a snap ring arranged on the inner wall of the lower end of the upper casing 1 , and the second stopper 21 can be designed as a snap ring arranged on the outer wall of the upper end of the lower casing 2 The upper clasp, this clasp structure can hang and connect the upper and lower casings, thereby preventing the upper and lower casings from detaching, and plays the role of limiting the lower casing 2 to prevent the lower casing 2 from falling into the furnace This affects the normal progress of the gasification process of the coal seam 6 to be gasified. At the same time, the snap ring is simple to process and easy to implement.
在上述实施例中，如图5所示，可以将第一限位件11卡环的限位面111与第二限位件21卡环的限位面211均设计为斜面，斜面结构可以使得第一限位件11的限位面111与第二限位件21的限位面211的接触更加平缓，可以避免钻井的施工过程中和下放套管的过程中容易卡滞的问题发生，可以提高施工质量和进度，同时斜面结构可以确保上套管1能够下放到预定位置，可以使得上、下套管更好的悬挂连接，阻止上、下套管脱离，确保待气化煤层6气化过程的正常进行。In the above-mentioned embodiment, as shown in FIG. 5, both the limiting surface 111 of the snap ring of the first limiting member 11 and the limiting surface 211 of the snap ring of the second limiting member 21 can be designed as inclined planes, and the inclined plane structure can make The contact between the limiting surface 111 of the first limiting member 11 and the limiting surface 211 of the second limiting member 21 is more gentle, which can avoid the problem of easy jamming during the construction process of drilling and the process of lowering the casing, and can Improve the construction quality and progress, and at the same time, the slope structure can ensure that the upper casing 1 can be lowered to the predetermined position, which can make the upper and lower casings better suspended and connected, prevent the upper and lower casings from detaching, and ensure the gasification of the coal seam 6 to be gasified normal progress of the process.
如图6和图7所示，可以将第一限位件11设计为均匀布置于上套管1的下端内壁一周的卡环段，卡环段可以采用n个均布的形式，第二限位件21为设置于下套管2的上端外壁上的卡环；或将第一限位件11设计为设置于上套管1的下端内壁上的卡环，第二限位件21设计为均匀布置于下套管2的上端外壁一周的卡环段，卡环段可以采用n个均布的形式。采用卡环段可以节约材料，减少施工时间，提高施工效率。As shown in Figures 6 and 7, the first limiting member 11 can be designed as a snap ring segment evenly arranged on the inner wall of the lower end of the upper sleeve 1, and the snap ring segments can be in the form of n uniform distributions. The positioning part 21 is a snap ring arranged on the outer wall of the upper end of the lower casing 2; or the first stopper 11 is designed as a snap ring arranged on the inner wall of the lower end of the upper casing 1, and the second stopper 21 is designed as The snap ring segments are uniformly arranged around the outer wall of the upper end of the lower casing 2, and the snap ring segments may be in the form of n uniformly distributed. The use of snap ring sections can save materials, reduce construction time and improve construction efficiency.
如上述实施例所述，如图8和图9所示，可以将与卡环段相对的卡环的限位面做成斜面，由此，可以使得卡环与限位面之间由面接触变为线接触，便于下套管2受热膨胀时向上的蠕动，减小了接触面的吸力，使得上、下套管更好的悬挂连接，防止上、下套管脱离，确保待气化煤层6气化过程的正常进行。As described in the above embodiment, as shown in Figure 8 and Figure 9, the limit surface of the snap ring opposite to the snap ring segment can be made into a slope, so that the snap ring and the limit surface can be in surface contact It becomes a line contact, which facilitates the upward creep of the lower casing 2 when it is heated and expands, reduces the suction force of the contact surface, makes the upper and lower casings better suspended and connected, prevents the upper and lower casings from detaching, and ensures the coal seam to be gasified 6. Normal operation of the gasification process.
如图10所示，可以将第一限位件11做成设置于上套管1的下端内壁上的阶梯状凸台环，第二限位件21为设置于下套管2的上端外壁上的阶梯状凸台环，凸台环结构可以增加上、下套管的悬挂连接强度，更有利于保护下套管2受重力作用下不与上套管1脱开，对下套管2的定位起到了保护作用。As shown in Figure 10, the first stopper 11 can be made into a stepped boss ring arranged on the inner wall of the lower end of the upper casing 1, and the second stopper 21 is arranged on the outer wall of the upper end of the lower casing 2 The stepped boss ring, the boss ring structure can increase the suspension connection strength of the upper and lower casings, which is more conducive to protecting the lower casing 2 from being separated from the upper casing 1 under the action of gravity, and the lower casing 2 Positioning plays a protective role.
如图11所示，还可以将第一限位件11做成设置于上套管1的下端内壁上的阶梯状凸台环，第二限位件21做成设置于下套管2的上端外壁上的卡环，且第二限位件21卡环的限位面211为斜面，可以使得凸台环与第二限位件21卡环的限位面211由面接触变为线接触，便于在下套管2受热膨胀时向上的蠕动，减小了接触面的吸力，使得上、下套管更好的悬挂连接，同时阻止下套管2的上端与上套管1的下端脱离，确保待气化煤层6气化过程的正常进行。As shown in Figure 11, the first stopper 11 can also be made into a stepped boss ring arranged on the inner wall of the lower end of the upper casing 1, and the second stopper 21 can be made into an upper end of the lower casing 2 The snap ring on the outer wall, and the stop surface 211 of the snap ring of the second stop member 21 is a slope, which can make the stop ring of the boss ring and the stop surface 211 of the second stop member 21 snap ring change from surface contact to line contact, It facilitates upward creeping when the lower casing 2 is heated and expands, reduces the suction force of the contact surface, makes the upper and lower casings better suspended and connected, and prevents the upper end of the lower casing 2 from detaching from the lower end of the upper casing 1, ensuring The gasification process of the coal seam 6 to be gasified is carried out normally.
如图12所示，将第一限位件11设计为设置于上套管1的下端内壁上的卡环，且第一限位件11卡环的限位面111为斜面，第二限位件21为设置于下套管2的上端外壁上的阶梯状凸台环，可以使得凸台环与第一限位件11卡环的限位面111由面接触变为线接触，便于在下套管2受热膨胀时向上的蠕动，减小了接触面的吸力，使得上、下套管更好的悬挂连接，同时阻止下套管2的上端与上套管1的下端脱离，确保待气化煤层6气化过程的正常进行。As shown in Figure 12, the first limiting member 11 is designed as a snap ring arranged on the inner wall of the lower end of the upper sleeve 1, and the limiting surface 111 of the first limiting member 11 snap ring is an inclined plane, and the second limiting Part 21 is a stepped boss ring arranged on the outer wall of the upper end of the lower casing 2, which can make the boss ring and the limiting surface 111 of the first limiting member 11 snap ring change from surface contact to line contact, which is convenient for the lower casing. The upward peristalsis of the tube 2 when it is heated and expanded reduces the suction of the contact surface, making the upper and lower casings better suspended and connected, and at the same time prevents the upper end of the lower casing 2 from detaching from the lower end of the upper casing 1, ensuring that the gasification The coal seam 6 gasification process is carried out normally.
在本说明书的描述中，具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。In the description of this specification, specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in an appropriate manner.
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410288536.8ACN104088617B (en) | 2014-06-24 | 2014-06-24 | A kind of underground coal gasification(UCG) inlet, outlet pore structure |
| Application Number | Priority Date | Filing Date | Title |
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| CN201410288536.8ACN104088617B (en) | 2014-06-24 | 2014-06-24 | A kind of underground coal gasification(UCG) inlet, outlet pore structure |
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| CN104088617B CN104088617B (en) | 2016-08-03 |
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| CN201410288536.8AActiveCN104088617B (en) | 2014-06-24 | 2014-06-24 | A kind of underground coal gasification(UCG) inlet, outlet pore structure |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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| TR01 | Transfer of patent right | Effective date of registration:20170210 Address after:065001 Hebei economic and Technological Development Zone, Langfang science and Technology Park in the Southern District of B building, room 522 Patentee after:ENN SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. Address before:The 065001 Hebei economic and Technological Development Zone of Langfang Huaxiang new Austrian Science and Technology Park in the Southern District B building room 522 Patentee before:ENN Coal Gasification Co., Ltd. | |
| TR01 | Transfer of patent right |