CN105064948B - Back-insertion cementing sealing device and back-insertion cementing method - Google Patents
Back-insertion cementing sealing device and back-insertion cementing method Download PDFInfo
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- CN105064948B CN105064948B CN201510418144.3A CN201510418144A CN105064948B CN 105064948 B CN105064948 B CN 105064948B CN 201510418144 A CN201510418144 A CN 201510418144A CN 105064948 B CN105064948 B CN 105064948B
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- 238000007789 sealing Methods 0.000 title claims abstract description 153
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000003780 insertion Methods 0.000 title claims description 96
- 238000009434 installation Methods 0.000 claims abstract description 50
- 238000005553 drilling Methods 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 17
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- 238000012856 packing Methods 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 20
- 235000017166 Bambusa arundinacea Nutrition 0.000 abstract 2
- 235000017491 Bambusa tulda Nutrition 0.000 abstract 2
- 241001330002 Bambuseae Species 0.000 abstract 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 abstract 2
- 239000011425 bamboo Substances 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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Abstract
Description
技术领域technical field
本发明涉及回插固井技术领域，是一种回插固井密封装置及回插固井方法。The invention relates to the technical field of back-insertion cementing, and relates to a back-insertion cementing sealing device and a back-insertion cementing method.
背景技术Background technique
随着低渗透油气资源开发规模的不断增加，油气井分段改造技术已成为扭转低渗透油气田多井低产、实现少井高产的重要技术手段之一。在油气井分段改造过程中上层井段通常使用尾管悬挂器固井，固井施工作业后使用易钻桥塞在尾管悬挂器下部尾管内坐封实现上下井段的封隔，之后通过常规回插接头进行以封固上部井段，固井施工作业完成后，钻除灰塞及易钻桥塞并进行下部层段的钻井，直至完钻。完钻后，下入压裂施工作业管串进行裸眼层段的压裂施工。该施工工艺能较好完成上部固井及下部层段的分段压裂等施工作业流程，但是，由于上部回插固井采用的是常规回插接头，需下入易钻桥塞实现上下层段的封隔，这种施工工艺存在以下缺点：（1）需要进行易钻桥塞下入、坐封等施工作业，工序复杂、作业风险相对较大，作业成本增加；（2）易钻桥塞不易钻除干净，易造成后期压裂管串下入困难。With the continuous increase of the development scale of low-permeability oil and gas resources, the oil and gas well segmented reconstruction technology has become one of the important technical means to reverse the low production of many wells and realize the high production of few wells in low permeability oil and gas fields. In the staged reconstruction of oil and gas wells, the upper well section is usually cemented with a liner hanger. After the cementing operation, the easy-to-drill bridge plug is used to set the seal in the tailpipe at the lower part of the liner hanger to isolate the upper and lower well sections. Conventional back-insertion joints are used to seal the upper well section. After the cementing operation is completed, the ash plug and easy-to-drill bridge plug are drilled and the lower section is drilled until the drilling is completed. After the drilling is completed, the fracturing construction operation pipe string is lowered to carry out the fracturing construction of the open hole section. This construction technology can better complete the construction operations such as upper cementing and segmental fracturing of the lower layer. However, since the upper back-insertion cementing uses conventional back-insertion joints, easy-drilling bridge plugs need to be lowered to realize the upper and lower layers. This construction technology has the following disadvantages: (1) Construction operations such as easy-drilling bridge plugging and setting are required, with complex procedures, relatively high operating risks, and increased operating costs; (2) Easy-drilling bridge The plug is not easy to drill and remove, and it is easy to make it difficult to run the fracturing string in the later stage.
发明内容Contents of the invention
本发明提供了一种回插固井密封装置及回插固井方法，克服了上述现有技术之不足，其能有效解决目前进行回插固井工序复杂、作业风险较大、作业成本高、易钻桥塞不易钻除干净的问题。The present invention provides a back-insertion cementing sealing device and a back-insertion cementing method, which overcome the above-mentioned deficiencies in the prior art, and can effectively solve the problems of complicated back-insertion cementing procedures, high operating risks, high operating costs, and Easy to drill the bridge plug is not easy to drill to clean the problem.
本发明的技术方案之一是通过以下措施来实现的：一种回插固井密封装置，包括本体和引导头；本体呈管状，引导头为上大下小的圆锥体，引导头下端为圆头，引导头的上端外侧一体固定有安装筒，本体的下端与安装筒固定安装在一起，在本体的上部外壁上自上而下固定安装第一组合密封装置和第二组合密封装置，在本体的下部外壁上自上而下固定安装有第三组合密封装置和第四组合密封装置，在第二组合密封装置与第三组合密封装置之间的本体上沿圆周设置有至少一个的传压孔。One of the technical solutions of the present invention is achieved through the following measures: a back-insertion cementing sealing device, including a body and a guide head; the body is in the shape of a tube, the guide head is a cone with a large upper part and a smaller bottom, and the lower end of the guide head is a circle The outer side of the upper end of the guide head is integrally fixed with an installation tube, the lower end of the body is fixedly installed with the installation tube, and the first combination sealing device and the second combination sealing device are fixedly installed on the upper outer wall of the body from top to bottom, and on the body The third combined sealing device and the fourth combined sealing device are fixedly installed on the lower outer wall from top to bottom, and at least one pressure transmission hole is arranged on the body between the second combined sealing device and the third combined sealing device along the circumference .
下面是对上述发明技术方案之一的进一步优化或/和改进：The following is a further optimization or/and improvement to one of the technical solutions of the above invention:
上述第一组合密封装置、第二组合密封装置、第三组合密封装置和第四组合密封装置均包括上固定套、上连接套、密封装置、下连接套和下固定套；上固定套的下部内壁上、上连接套的上部外壁上、下连接套的下部外壁上、下固定套的上部内壁上均有安装槽，上固定套的安装槽与上连接套的安装槽固定安装在一起，下连接套的安装槽与下固定套的安装槽固定安装在一起，上固定套和下固定套分别与本体固定安装在一起，在上连接套和下连接套之间固定安装有密封装置。The first combined sealing device, the second combined sealing device, the third combined sealing device and the fourth combined sealing device all include an upper fixing sleeve, an upper connecting sleeve, a sealing device, a lower connecting sleeve and a lower fixing sleeve; the lower part of the upper fixing sleeve On the inner wall, on the upper outer wall of the upper connecting sleeve, on the lower outer wall of the lower connecting sleeve, on the upper inner wall of the lower fixing sleeve, there are installation grooves, the installation grooves of the upper fixing sleeve and the installation grooves of the upper connecting sleeve are fixedly installed together, the lower The mounting groove of the connecting sleeve is fixedly installed with the mounting groove of the lower fixing sleeve, the upper fixing sleeve and the lower fixing sleeve are respectively fixedly installed with the body, and a sealing device is fixedly installed between the upper connecting sleeve and the lower connecting sleeve.
上述上固定套和下固定套分别与本体通过螺钉或销钉固定安装在一起。The upper fixing sleeve and the lower fixing sleeve are respectively fixed and installed with the body through screws or pins.
上述上固定套和下固定套分别与本体通过C环安装在一起。The above-mentioned upper fixing sleeve and the lower fixing sleeve are respectively installed with the main body through a C ring.
上述密封装置为V形盘根组合。The above-mentioned sealing device is a V-shaped packing combination.
上述在第二组合密封装置与第三组合密封装置之间的本体上沿圆周均布有四个的传压孔；或/和，引导头的下端为为铝合金圆头。There are four pressure transmission holes evenly distributed along the circumference on the body between the second combined sealing device and the third combined sealing device; or/and, the lower end of the guide head is an aluminum alloy round head.
上述在本体的下端与安装筒之间固定安装有密封圈。A sealing ring is fixedly installed between the lower end of the body and the installation cylinder.
上述本体的下端与安装筒通过螺纹固定安装在一起。The lower end of the above-mentioned body and the installation cylinder are fixedly installed together through threads.
上述在本体的下端与安装筒之间固定安装有紧固螺钉。A fastening screw is fixedly installed between the lower end of the body and the installation cylinder.
本发明的技术方案之二是通过以下措施来实现的：一种使用回插固井密封装置进行回插固井方法按下述步骤进行：第一步，进行尾管悬挂器固井，在尾管悬挂器上固定连接尾管悬挂器回接筒；第二步，将回插固井密封装置与回插固井管串连接，下入井内，回插固井密封装置在引导头的引导下进入尾管悬挂器回接筒内，第三组合密封装置和第四组合密封装置在本体与尾管悬挂器回接筒之间进行密封，上提回插固井管串，传压孔位于尾管悬挂器回接筒上方、裸露于本体与井壁之间的环形空间内；第三步，通过传压孔进行回插固井注灰施工作业；第四步，注灰施工作业完成后，下放回插固井密封装置和回插固井管串，回插固井密封装置完全进入尾管悬挂器回接筒内，第一组合密封装置和第二组合密封装置、第三组合密封装置和第四组合密封装置分别在本体与尾管悬挂器回接筒之间进行密封，待注入的水泥浆完全凝固后，回插固井注灰施工作业完成；第五步，下入钻井管串，进行回插固井管串内灰塞的钻除和引导头的钻除作业，回插固井管串内的灰塞和引导头钻除后，进行后续的钻井及压裂施工作业。The second technical solution of the present invention is achieved through the following measures: a method of back-insertion cementing using a back-insertion cementing sealing device is carried out according to the following steps: the first step is to carry out the cementing of the liner hanger. The liner hanger is fixedly connected to the liner hanger return sleeve; the second step is to connect the back-insertion cementing sealing device with the back-insertion cementing pipe string, run into the well, and the back-insertion cementing sealing device is guided by the guide head After entering the liner hanger tie-back barrel, the third combined sealing device and the fourth combined sealing device seal between the main body and the liner hanger tie-back barrel, lift up and insert the cementing string, and the pressure transmission hole is located at the tail tube hanger. The upper part of the pipe hanger connection tube is exposed in the annular space between the main body and the well wall; the third step is to insert back the cementing ash injection operation through the pressure transmission hole; the fourth step is to complete the ash injection construction operation. Lower the back-insertion cementing sealing device and the back-insertion cementing string, the back-insertion cementing sealing device completely enters the liner hanger tie-back barrel, the first combined sealing device and the second combined sealing device, the third combined sealing device and the The fourth combined sealing device seals between the main body and the liner hanger return barrel respectively. After the injected cement slurry is completely solidified, the back-insertion cementing and ash injection construction operation is completed; the fifth step is to run the drilling string, Carry out drilling and removal of ash plugs in the back-inserted cementing string and drill-out of the pilot head. After the ash plugs in the back-inserted cementing string and the pilot head are drilled out, follow-up drilling and fracturing operations are carried out.
本发明使用回插固井密封装置进行回插固井施工作业后，无需使用易钻桥塞的临时性封堵工具且引导头易钻除，因此，可以简化作业工序、大大缩短作业流程、减少现场设备及人员动用数量，从而大大减少了现场施工风险、减低了作业成本。After the back-insertion cementing sealing device is used in the present invention for the back-insertion cementing operation, there is no need to use a temporary plugging tool that is easy to drill bridge plugs, and the guide head is easy to drill and remove. Therefore, the operation process can be simplified, the operation process can be greatly shortened, and the The number of on-site equipment and personnel is greatly reduced, which greatly reduces the risk of on-site construction and reduces the operating cost.
附图说明Description of drawings
附图1为本发明中回插固井密封装置上部分最佳实施例的主视半剖视结构示意图。Accompanying drawing 1 is the front view semi-sectional structural schematic diagram of the best embodiment of the upper part of the plug-back cementing sealing device in the present invention.
附图2为本发明中回插固井密封装置下部分最佳实施例的主视半剖视结构示意图。Accompanying drawing 2 is the front view semi-sectional structural schematic diagram of the best embodiment of the lower part of the plug-back cementing sealing device in the present invention.
附图3为本发明中第一组合密封装置、第二组合密封装置、第三组合密封装置和第四组合密封装置的放大结构示意图。Accompanying drawing 3 is the enlarged structural diagram of the first combined sealing device, the second combined sealing device, the third combined sealing device and the fourth combined sealing device in the present invention.
附图4为本发明中尾管悬挂器固井的结构示意图。Accompanying drawing 4 is the structure diagram of liner hanger cementing in the present invention.
附图5为本发明中回插固井注灰的结构示意图。Accompanying drawing 5 is the structure schematic diagram of plugging back cementing ash injection in the present invention.
附图6为本发明中回插固井候凝的结构示意图。Accompanying drawing 6 is the structural schematic diagram of back-insertion cementing waiting for solidification in the present invention.
附图7为本发明中钻除灰塞、引导头及完钻的结构示意图。Accompanying drawing 7 is the structural schematic diagram of drilling ash removal plug, guide head and complete drilling in the present invention.
附图中的编码分别为：1为本体，2为引导头，3为安装筒，4为第一组合密封装置，5为第二组合密封装置，6为第三组合密封装置，7为第四组合密封装置，8为传压孔，9为回插固井密封装置，10为尾管悬挂器回接筒，11为上固定套，12为上连接套，13为密封装置，14为下连接套，15为下固定套，16为C环，17为密封圈，18为紧固螺钉，19为尾管悬挂器，20为回插固井管串。The codes in the drawings are: 1 is the body, 2 is the guide head, 3 is the installation cylinder, 4 is the first combined sealing device, 5 is the second combined sealing device, 6 is the third combined sealing device, 7 is the fourth Combined sealing device, 8 is the pressure transmission hole, 9 is the plug-back cementing sealing device, 10 is the return sleeve of the liner hanger, 11 is the upper fixing sleeve, 12 is the upper connecting sleeve, 13 is the sealing device, and 14 is the lower connection 15 is the lower fixing sleeve, 16 is the C ring, 17 is the sealing ring, 18 is the fastening screw, 19 is the liner hanger, and 20 is the back-insertion cementing pipe string.
具体实施方式Detailed ways
本发明不受下述实施例的限制，可根据本发明的技术方案与实际情况来确定具体的实施方式。The present invention is not limited by the following examples, and specific implementation methods can be determined according to the technical solutions of the present invention and actual conditions.
在本发明中，为了便于描述，各部件的相对位置关系的描述均是根据说明书附图1的布图方式来进行描述的，如：上、下、左、右等的位置关系是依据说明书附图的布图方向来确定的。In the present invention, for the convenience of description, the description of the relative positional relationship of each component is described according to the layout of the accompanying drawing 1 of the specification. The layout direction of the graph is determined.
下面结合实施例及附图对本发明作进一步描述：Below in conjunction with embodiment and accompanying drawing, the present invention will be further described:
实施例1，如附图1、2、3所示，该回插固井密封装置9包括本体1和引导头2；本体1呈管状，引导头2为上大下小的圆锥体，引导头2下端为圆头，引导头2的上端外侧一体固定有安装筒3，本体1的下端与安装筒3固定安装在一起，在本体1的上部外壁上自上而下固定安装第一组合密封装置4和第二组合密封装置5，在本体1的下部外壁上自上而下固定安装有第三组合密封装置6和第四组合密封装置7，在第二组合密封装置5与第三组合密封装置6之间的本体1上沿圆周设置有至少一个的传压孔8。引导头2为上大下小的圆锥体，引导头2的下端为圆头，便于本回插固井密封装置9的导入，当本回插固井密封装置9进入尾管悬挂器回接筒10内时，第三组合密封装置6和第四组合密封装置7实现本体1与尾管悬挂器回接筒10之间的密封，传压孔8便于本体1内外的连通，通过传压孔8可以实现回插管柱注灰施工作业；当注灰作业完成后，继续下入本回插固井密封装置9，第一组合密封装置4和第二组合密封装置5进一步实现本体1与尾管悬挂器回接筒10之间的密封；本回插固井密封装置9具备回插、密封和上下封隔三种功能，最后钻除引导头2即可，无需使用易钻桥塞的临时性封堵工具且易钻除，因此，作业流程简单，施工风险及作业成本大大减小。Embodiment 1, as shown in accompanying drawings 1, 2, and 3, the plug-back cementing sealing device 9 includes a main body 1 and a guide head 2; 2. The lower end is a round head. The outer side of the upper end of the guide head 2 is integrally fixed with the installation cylinder 3. The lower end of the body 1 is fixedly installed with the installation cylinder 3. On the upper outer wall of the body 1, the first combined sealing device is fixedly installed from top to bottom. 4 and the second combination sealing device 5, the third combination sealing device 6 and the fourth combination sealing device 7 are fixedly installed on the lower outer wall of the body 1 from top to bottom, and the second combination sealing device 5 and the third combination sealing device The body 1 between 6 is provided with at least one pressure transmission hole 8 along the circumference. The guide head 2 is a cone with a large top and a small bottom. The lower end of the guide head 2 is a round head, which facilitates the introduction of the plug-in cementing sealing device 9. When the plug-in cementing sealing device 9 enters the liner hanger back connection When within 10, the third combined sealing device 6 and the fourth combined sealing device 7 realize the sealing between the main body 1 and the liner hanger tie-back barrel 10, the pressure transmission hole 8 facilitates the communication between the inside and outside of the main body 1, and through the pressure transmission hole 8 The ash injection construction operation of the back-insertion pipe string can be realized; after the ash injection operation is completed, the back-insertion cementing sealing device 9 is continued to be lowered, and the first combined sealing device 4 and the second combined sealing device 5 further realize the connection between the main body 1 and the tail pipe. The seal between the hanger tie-back barrels 10; the back-insertion cementing sealing device 9 has three functions of back-insertion, sealing, and up-and-down isolation, and finally the guide head 2 can be drilled without using the temporary bridge plug that is easy to drill. The plugging tool is easy to drill and remove, so the operation process is simple, and the construction risk and operation cost are greatly reduced.
实施例2，如附图1、2、3所示，作为实施例1的优选，第一组合密封装置4、第二组合密封装置5、第三组合密封装置6和第四组合密封装置7均包括上固定套11、上连接套12、密封装置13、下连接套14和下固定套15；上固定套11的下部内壁上、上连接套12的上部外壁上、下连接套14的下部外壁上、下固定套15的上部内壁上均有安装槽，上固定套11的安装槽与上连接套12的安装槽固定安装在一起，下连接套14的安装槽与下固定套15的安装槽固定安装在一起，上固定套11和下固定套15分别与本体1固定安装在一起，在上连接套12和下连接套14之间固定安装有密封装置15。Embodiment 2, as shown in accompanying drawing 1,2,3, as preferred embodiment 1, the first combined sealing device 4, the second combined sealing device 5, the third combined sealing device 6 and the fourth combined sealing device 7 are all Including upper fixing sleeve 11, upper connecting sleeve 12, sealing device 13, lower connecting sleeve 14 and lower fixing sleeve 15; upper inner wall of upper fixing sleeve 11, upper outer wall of upper connecting sleeve 12, lower outer wall of lower connecting sleeve 14 There are installation grooves on the upper inner wall of the upper and lower fixed sleeves 15, the installation grooves of the upper fixed sleeve 11 and the installation grooves of the upper connecting sleeve 12 are fixedly installed together, the installation grooves of the lower connecting sleeve 14 and the installation grooves of the lower fixing sleeve 15 Fixedly installed together, the upper fixed sleeve 11 and the lower fixed sleeve 15 are fixedly installed with the main body 1 respectively, and a sealing device 15 is fixedly installed between the upper connecting sleeve 12 and the lower connecting sleeve 14 .
实施例3，根据需要，作为实施例2的优选，上固定套11和下固定套15分别与本体1通过螺钉或销钉固定安装在一起。Embodiment 3, according to needs, as a preference of Embodiment 2, the upper fixing sleeve 11 and the lower fixing sleeve 15 are respectively fixed and installed with the main body 1 by screws or pins.
实施例4，如附图1、2、3所示，作为实施例2的优选，上固定套11和下固定套15分别与本体1通过C环16安装在一起。实际应用中，C环16不仅能够满足本体1与上固定套11和下固定套15之间的安装强度，而且安装方便。Embodiment 4, as shown in Figures 1, 2 and 3, as a preferred embodiment of Embodiment 2, the upper fixing sleeve 11 and the lower fixing sleeve 15 are respectively installed with the body 1 through a C ring 16 . In practical applications, the C-ring 16 can not only satisfy the installation strength between the body 1 and the upper fixing sleeve 11 and the lower fixing sleeve 15, but also facilitate installation.
实施例5，如附图1、2、3所示，作为实施例2、实施例3和实施例4的优选，密封装置13为V形盘根组合。V形盘根组合具有较好的密封作用，V形盘根组合为现有公知的技术。Embodiment 5, as shown in Figures 1, 2 and 3, as a preferred embodiment of Embodiment 2, Embodiment 3 and Embodiment 4, the sealing device 13 is a V-shaped packing combination. The V-shaped packing combination has better sealing effect, and the V-shaped packing combination is a known technology in the prior art.
实施例6，如附图1、2、3所示，作为上述实施例的优选，在第二组合密封装置5与第三组合密封装置6之间的本体1上沿圆周均布有四个的传压孔8；或/和，引导头2的下端为为铝合金圆头。四个传压孔8能够较好的进行注灰作业；引导头2的下端为为铝合金圆头，方便钻除。Embodiment 6, as shown in accompanying drawings 1, 2, and 3, as a preference of the above embodiment, there are four uniformly distributed along the circumference on the body 1 between the second combined sealing device 5 and the third combined sealing device 6 The pressure transmission hole 8; or/and, the lower end of the guide head 2 is an aluminum alloy round head. The four pressure transmission holes 8 can better carry out the ash injection operation; the lower end of the guide head 2 is an aluminum alloy round head, which is convenient to drill and remove.
实施例7，根据需要，作为上述实施例的优选，在本体1的下端与安装筒3之间固定安装有密封圈17。Embodiment 7, according to needs, as a preference of the above embodiments, a sealing ring 17 is fixedly installed between the lower end of the main body 1 and the installation cylinder 3 .
实施例8，如附图1、2、3所示，作为上述实施例的优选，本体1的下端与安装筒3通过螺纹固定安装在一起。螺纹连接方便安装与拆卸。Embodiment 8, as shown in Figures 1, 2 and 3, as a preference of the above embodiment, the lower end of the body 1 and the installation cylinder 3 are screwed together. Threaded connection for easy installation and removal.
实施例9，如附图1、2、3所示，作为实施例7的优选，在本体1的下端与安装筒3之间固定安装有紧固螺钉18。紧固螺钉18防止安装筒3与本体1之间发生径向转动，为本回插固井密封装置的顺利实施提供保障。Embodiment 9, as shown in accompanying drawings 1, 2 and 3, as a preference of embodiment 7, a fastening screw 18 is fixedly installed between the lower end of the body 1 and the installation cylinder 3 . The fastening screw 18 prevents the radial rotation between the installation cylinder 3 and the body 1, and provides guarantee for the smooth implementation of the plug-back cementing sealing device.
实施例10，该使用回插固井密封装置进行回插固井方法按下述步骤进行：第一步，进行尾管悬挂器19固井，在尾管悬挂器19上固定连接尾管悬挂器回接筒10，如图4所示；第二步，将回插固井密封装置9与回插固井管串20连接，下入井内，回插固井密封装置9在引导头2的引导下进入尾管悬挂器回接筒10内，第三组合密封装置5和第四组合密封装置6在本体1与尾管悬挂器回接筒10之间进行密封，上提回插固井管串20，传压孔8位于尾管悬挂器回接筒10上方、裸露于本体1与井壁之间的环形空间内，如附图5所示；第三步，通过传压孔8进行回插固井注灰施工作业，如附图2所示；第四步，注灰施工作业完成后，下放回插固井密封装置9和回插固井管串20，回插固井密封装置9完全进入尾管悬挂器回接筒10内，第一组合密封装置4和第二组合密封装置5、第三组合密封装置6和第四组合密封装置7分别在本体1与尾管悬挂器回接筒10之间进行密封，如附图6所示，待注入的水泥浆完全凝固后，回插固井注灰施工作业完成；第五步，回插固井注灰施工作业完成后，回插固井管串20内残余的水泥浆凝固后形成灰塞，下入钻井管串，进行回插固井管串20内灰塞的钻除和引导头2的钻除作业，回插固井管串20内的灰塞和引导头2钻除后，进行后续的钻井及压裂施工作业，如附图7所示。Embodiment 10, the back-insertion cementing method using the back-insertion cementing sealing device is carried out according to the following steps: the first step is to carry out the cementing of the liner hanger 19, and the liner hanger is fixedly connected to the liner hanger 19 The tie-back barrel 10 is shown in Figure 4; the second step is to connect the back-insertion cementing sealing device 9 with the back-insertion cementing string 20, run it into the well, and insert the back-insertion cementing sealing device 9 under the guidance of the guide head 2. down into the liner hanger return barrel 10, the third combined sealing device 5 and the fourth combined sealing device 6 seal between the main body 1 and the liner hanger return barrel 10, lift back and insert the cementing pipe string 20. The pressure transmission hole 8 is located above the liner hanger return tube 10 and exposed in the annular space between the main body 1 and the well wall, as shown in Figure 5; the third step is to insert back through the pressure transmission hole 8 The cementing ash injection construction operation is shown in Figure 2; in the fourth step, after the ash injection construction operation is completed, the back-insertion cementing sealing device 9 and the back-insertion cementing pipe string 20 are lowered, and the back-insertion cementing sealing device 9 is completely Entering into the liner hanger return barrel 10, the first combined sealing device 4 and the second combined sealing device 5, the third combined sealing device 6 and the fourth combined sealing device 7 are connected between the main body 1 and the liner hanger return barrel respectively. 10 are sealed, as shown in Figure 6, after the injected cement slurry is completely solidified, the back-insertion cementing ash injection construction operation is completed; in the fifth step, after the back-insertion cementing ash injection construction operation is completed, the back-insertion cementing operation is completed. After the residual cement slurry in the well string 20 is solidified, ash plug is formed, and the drilling string is lowered into the drilling string to carry out the drilling and removal of the ash plug in the cementing string 20 and the drilling of the guide head 2, and the back insertion of the cementing string After the ash plug in 20 and the guide head 2 are drilled out, follow-up drilling and fracturing operations are carried out, as shown in Figure 7.
回插固井密封装置9是一种操作简便，可靠性高的新型回插接头，引导头2易于回插导入及钻除，同时具备回插、密封、上下封隔三项功能，无需使用易钻桥塞，因此，作业流程简单、施工风险及作业费用大大减小。为低渗透油气井的有效开发提供可靠技术保障。The plug-back cementing sealing device 9 is a new type of plug-in joint with easy operation and high reliability. The guide head 2 is easy to plug back into and drill out. Drilling bridge plugs, therefore, the operation process is simple, the construction risk and operation cost are greatly reduced. Provide reliable technical support for the effective development of low-permeability oil and gas wells.
本发明使用回插固井密封装置9进行回插固井施工作业后，无需使用易钻桥塞的临时性封堵工具且引导头易钻除，因此，可以简化作业工序、大大缩短作业流程、减少现场设备及人员动用数量，从而大大减少了现场施工风险、减低了作业成本。The present invention uses the back-insertion cementing sealing device 9 to carry out the back-insertion cementing construction operation, without using a temporary plugging tool that is easy to drill the bridge plug, and the guide head is easy to drill and remove. Therefore, the operation process can be simplified, the operation process can be greatly shortened, Reduce the number of on-site equipment and personnel, thereby greatly reducing on-site construction risks and reducing operating costs.
以上技术特征构成了本发明的实施例，其具有较强的适应性和实施效果，可根据实际需要增减非必要的技术特征，来满足不同情况的需求。The above technical features constitute the embodiment of the present invention, which has strong adaptability and implementation effect, and non-essential technical features can be added or subtracted according to actual needs to meet the needs of different situations.
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| CN201502337U (en) * | 2009-09-30 | 2010-06-09 | 安东石油技术（集团）有限公司 | Casing tie-back tool |
| CN201851076U (en) * | 2010-11-21 | 2011-06-01 | 中国石油集团西部钻探工程有限公司 | Seat-sealed tieback insertion head |
| CN202338317U (en) * | 2011-11-02 | 2012-07-18 | 中国石油集团渤海钻探工程有限公司 | Tie-back inserting and sealing device for fracturing |
| CN203961895U (en) * | 2014-05-30 | 2014-11-26 | 中国石油化工集团公司 | A kind of tie back liner plug |
| CN204851164U (en) * | 2015-07-17 | 2015-12-09 | 中国石油集团西部钻探工程有限公司 | Plug back cementing sealing device |
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| CN201502337U (en) * | 2009-09-30 | 2010-06-09 | 安东石油技术（集团）有限公司 | Casing tie-back tool |
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| CN202338317U (en) * | 2011-11-02 | 2012-07-18 | 中国石油集团渤海钻探工程有限公司 | Tie-back inserting and sealing device for fracturing |
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Effective date of registration: 20201113 Address after: 100120 Beijing Xicheng District six laying Kang Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Xibu Drilling Engineering Co.,Ltd. Address before: 830026 science and technology management division, West drilling and Drilling Engineering Institute, No. 326 South Central Road, Urumqi economic and Technological Development Zone, the Xinjiang Uygur Autonomous Region, China Patentee before: CNPC Xibu Drilling Engineering Co.,Ltd. |