CN108035694B - Cement retainer - Google Patents
Cement retainer Download PDFInfo
- Publication number
- CN108035694B CN108035694B CN201810004098.6A CN201810004098A CN108035694B CN 108035694 B CN108035694 B CN 108035694B CN 201810004098 A CN201810004098 A CN 201810004098A CN 108035694 B CN108035694 B CN 108035694B
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- Prior art keywords
- liquid
- cement retainer
- sleeve
- slip
- slip assembly
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- 239000004568 cement Substances 0.000 title claims abstract description 94
- 239000007788 liquid Substances 0.000 claims abstract description 85
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000004891 communication Methods 0.000 claims abstract description 7
- 210000000078 claw Anatomy 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 10
- 239000007769 metal material Substances 0.000 claims description 7
- 229910001018 Cast iron Inorganic materials 0.000 claims description 4
- 239000013013 elastic material Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000003780 insertion Methods 0.000 abstract description 22
- 230000037431 insertion Effects 0.000 abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 21
- 230000008569 process Effects 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 description 8
- 239000003292 glue Substances 0.000 description 4
- 230000000593 degrading effect Effects 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005465 channeling Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003578 releasing effect Effects 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Earth Drilling (AREA)
Abstract
The application relates to the technical field of downhole tools, in particular to a cement retainer. The cement retainer comprises a first slip assembly, a central tube, a lower joint, a first cone sleeve, a rubber cylinder and an inner sliding sleeve, and can be matched with a conventional setting tool for use, wherein the cement retainer is connected with the setting tool through an adapter and is placed at a designated position, and then is set through the setting tool; after completion of setting, the cement retainer is fixed at a preset setting depth in the shaft, a matched insertion pipe is put in, the inner sliding sleeve is pushed to be communicated with the third liquid through hole, the first liquid through hole and the second liquid through hole, and cement is injected into the shaft through the three liquid through holes, so that the plugging operation of a high-pressure water layer is completed; after the plugging operation is completed, the insertion tube is pulled out, the insertion tube drives the inner sliding sleeve to move in the withdrawal process, the inner sliding sleeve moves to cut off the communication between the first liquid passing hole and the third liquid passing hole, and the problem of liquid backflow can be effectively avoided.
Description
Technical Field
The application relates to the technical field of downhole tools, in particular to a cement retainer.
Background
In the middle and later stages of oil field development, the casing is corroded and perforated above the cement return height of the oil well, leakage occurs in the cement well cementation section, so that stratum water adjacent to the high-pressure water layer flows into a shaft, or the energy of the oil layer is reduced and adjacent to the high-pressure water layer and the oil layer are mutually channeling to cause water or oil layer flooding of the oil well, and serious difficulty is brought to oil field development. At present, some old oil wells produced for many years have high water content for a long time, are in a well closing state, and are analyzed and judged: firstly, after long-term exploitation, an oil layer casing is likely to corrode and perforate, and the casing is lost to cause flooding of the oil layer; and secondly, the high-pressure water injection well can be injected at high pressure for a long time, and a water head is formed with the oil layer of the well in a conical manner to cause the flooding of the oil layer. And thirdly, a high-pressure water layer near the oil layer possibly flows through the oil layer to cause flooding of the oil layer. Finding leaks through the packer eliminates the possibility of casing corrosion perforation leaks. Isotope logging is adopted, and an adjacent high-pressure water layer is found at the lower part of the oil layer and is mutually channeling with the oil layer, so that the whole water is produced by the well.
For this case, the conventional treatment method is to shoot an engineering hole in the high-pressure water layer, and then perform chemical blocking, mainly cement paste blocking, on the high-pressure water layer. And after plugging, drilling the cement plug, and recovering the exploitation of the oil layer. However, the production oil layer of the well is above and adjacent to the high-pressure water layer, and the conventional plugging method has great risk in engineering construction, and is difficult to ensure that the oil layer is not plugged by cement paste, and particularly the high-pressure water layer is plugged, so that the cement paste can be spitted out of the high-pressure water layer, and the plugging failure is likely to occur. Therefore, only the running tool is used for separating the oil layer from the high-pressure water layer adjacent to the oil layer, and then the high-pressure water layer is blocked.
Cement holders have been used for many years, and traditional cement holders are made of metal materials and are put into a well through a drill rod or an oil pipe, and although the traditional cement holders are good in tightness, poor in pressure resistance and long in sealing time, the cement holders can also be milled, liquid is easy to flow backwards during operation, and equipment is damaged; meanwhile, after the metal material is drilled and ground, a large residue may block the well bore, causing unnecessary loss.
Disclosure of Invention
The technical problems to be solved by the application are as follows: the existing cement retainer is easy to cause liquid backflow during working, so that equipment is damaged; meanwhile, after the cement retainer is drilled and ground, a large amount of residues can block a shaft, so that unnecessary loss is caused.
(II) technical scheme
In order to solve the technical problems, the application provides a cement retainer, which comprises a first slip component, a central pipe, a lower joint, a first cone sleeve, a rubber cylinder and an inner sliding sleeve, wherein the central pipe and the lower joint are of tubular structures, a first hollow cavity with two open ends is formed in the central pipe, a second hollow cavity with one open end is formed in the lower joint, one end of the central pipe is inserted into the second hollow cavity of the lower joint, a third hollow cavity is formed in the inner sliding sleeve, the inner sliding sleeve is positioned in the first hollow cavity, a first liquid through hole is formed in the central pipe, a second liquid through hole communicated with the first liquid through hole is formed in the lower joint, a third liquid through hole communicated with the third hollow cavity is formed in the inner sliding sleeve, and the inner sliding sleeve slides in the first hollow cavity to be communicated with the first liquid through hole and the third liquid through hole or cut off the communication between the first liquid through hole and the third liquid through hole;
a limiting part is arranged on the outer wall of the other end of the central tube, and a first slip assembly, a first cone sleeve and a rubber sleeve are sequentially sleeved on the outer side of the central tube along the direction from the limiting part to the lower joint;
the first slip assembly is connected with the limiting part, the rubber sleeve is connected with the lower joint, the first slip assembly is wedge-shaped, the first cone sleeve is provided with a first inclined surface matched with the first slip assembly, and the first inclined surface inclines from inside to outside along the direction from the limiting part to the rubber sleeve.
The application has the beneficial effects that: the application provides a cement retainer, which comprises a first slip assembly, a central pipe, a lower joint, a first cone sleeve, a rubber cylinder and an inner sliding sleeve, wherein the cement retainer can be matched with a conventional setting tool for use; after completion of setting, the cement retainer is fixed at a preset setting depth in the shaft, a matched insertion pipe is inserted into a first hollow cavity in the central pipe, then the insertion pipe is inserted into the inner sliding sleeve, the inner sliding sleeve is pushed to move, a third through-liquid hole on the inner sliding sleeve is communicated with the first through-liquid hole and the second through-liquid hole to form a passage, cement is injected into the third hollow cavity through the insertion pipe, flows out to the outer side of the cement retainer through the third through-liquid hole, the first through-liquid hole and the second through-liquid hole and enters the shaft, and a cement paste blocking layer is formed at the lower side of the cement retainer in the shaft, so that the blocking operation of a high-pressure water layer is completed; after the plugging operation is finished, the insertion pipe is pulled out, the inner sliding sleeve is driven to move in the process of withdrawing, the inner sliding sleeve moves to cut off the communication between the first liquid passing hole and the third liquid passing hole, so that liquid or cement in a shaft can be effectively prevented from returning to the cement retainer through the second liquid passing hole, the first liquid passing hole and the third liquid passing hole, blind plugs are formed inside the cement retainer, the shaft is fully plugged, cement at the lower part of the cement retainer can be plugged below the cement retainer, the problem of liquid backflow can be effectively avoided, and the normal operation of equipment is protected.
Further, the cement retainer further comprises a push ring, the push ring is sleeved on the outer wall surface of the central pipe, and the first slip assembly is connected with the limiting part through the push ring.
Further, the cement retainer further comprises a second slip assembly and a second cone sleeve, the second slip assembly and the second cone sleeve are sequentially sleeved on the outer wall surface of the central tube from the rubber cylinder to the lower joint, the rubber cylinder is connected with the lower joint through the second slip assembly and the second cone sleeve, the second slip assembly is in a wedge shape, a second inclined surface matched with the second slip assembly is arranged on the second cone sleeve, and the second inclined surface is inclined from outside to inside along the direction from the rubber cylinder to the lower joint.
Further, the first slip assembly and the second slip assembly each comprise a slip bowl and slip teeth, the slip bowl is sleeved on the outer side of the central tube, and the slip teeth are fixedly arranged on the outer surface of the slip bowl.
Further, the inner sliding sleeve comprises a connecting section and a locking section which are connected, and the inner diameter of the locking section is larger than that of the connecting section
The connecting section is close to the lower joint and is cylindrical, the third liquid through hole is formed in the connecting section, and the cylindrical connecting section is internally provided with the third hollow cavity with two open ends;
the locking section includes a plurality of long banding locking claws of making by elastic material, a plurality of locking claw's one end respectively with the one end of linkage segment links to each other and constitutes cylindric locking section, and adjacent two form the gap between the locking claw, every locking claw's the other end all is equipped with outside convex protruding portion, round annular mounting groove on the inner wall of center tube, protruding portion is located the mounting groove, the mounting groove is close to the one end of lower clutch is equipped with the direction inclined plane, the direction inclined plane is outwards inwards inclined along the direction of center tube to lower clutch.
Further, a short rod is arranged in the second hollow cavity, the end part of the central tube is propped against the short tube, and when one end of the connecting section, which is far away from the locking section, is propped against the short rod, the first liquid through hole is communicated with the third liquid through hole.
Further, the slip teeth are made of cast iron material, the packing element is made of rubber material, the center tube and the inner slip sleeve are made of aluminum material, and the first cone sleeve, the second cone sleeve, the push ring and the lower joint are made of soluble metal material.
Drawings
The advantages of the foregoing and/or additional aspects of the present application will become apparent and readily appreciated from the description of the embodiments, taken in conjunction with the accompanying drawings, wherein:
FIG. 1 is a schematic view of a cement retainer according to an embodiment of the present application in a closed state of an inner sliding sleeve;
fig. 2 is a schematic structural view of the cement retainer according to the embodiment of the present application in an open state of the inner sliding sleeve.
Wherein the correspondence between the reference numerals and the component names in fig. 1 and 2 is:
1. the cement retainer comprises 11, a central tube, 111, a first hollow cavity, 112, a first liquid passing hole, 113, a limiting part, 114, a mounting groove, 12, a first slip assembly, 13, a second slip assembly 14, a first cone sleeve, 15, a second cone sleeve, 16, a push ring, 17, a rubber cylinder, 18, an inner sliding sleeve, 181, a connecting section, 182, a third hollow cavity, 183, a locking claw, 184, a third liquid passing hole, 19, a lower joint, 191, a second hollow cavity, 192, a second liquid passing hole, 193 and a short rod.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
As shown in fig. 1 and 2, the present application provides a cement retainer 1, which comprises a first slip assembly 12, a central tube 11, a lower joint 19, a second cone sleeve 15, a rubber cylinder 17 and an inner sliding sleeve 18, wherein the central tube 11 and the lower joint 19 are both in tubular structures, a first hollow cavity 111 with two open ends is formed inside the central tube 11, a second hollow cavity 191 with one open end is formed inside the lower joint 19, one end of the central tube 11 is inserted into the second hollow cavity 191 of the lower joint 19, a third hollow cavity 182 is formed inside the inner sliding sleeve 18, the inner sliding sleeve 18 is located inside the first hollow cavity 111, a first through-liquid hole 112 is formed on the central tube 11, a second through-liquid hole 192 communicated with the first through-liquid hole 112 is formed on the lower joint 19, a third through-liquid hole 184 communicated with the third hollow cavity 182 is formed on the inner sliding sleeve 18, and the inner sliding sleeve 18 cuts off the first through-liquid hole 184 from the first hollow cavity 111 to the third through-liquid hole 112 or the third through-liquid hole 112; a limiting part 113 is arranged on the outer wall of the other end of the central pipe 11, and a first slip assembly 12, a second cone sleeve 15 and a rubber sleeve 17 are sleeved on the outer side of the central pipe 11 in sequence along the direction from the limiting part 113 to the lower joint 19; the first slip assembly 12 is connected with the limiting part 113, the rubber sleeve 17 is connected with the lower joint 19, the first slip assembly 12 is wedge-shaped, the first cone sleeve is provided with a first inclined plane matched with the first slip assembly 12, and the first inclined plane inclines from inside to outside along the direction from the limiting part 113 to the rubber sleeve 17.
The cement retainer 1 provided by the application can be matched with a conventional setting tool, the cement retainer 1 is connected with the setting tool through an adapter, the cement retainer 1 is lowered to a designated position through tools such as a cable, an oil pipe, a steel wire and the like, and then the setting is carried out through the setting tool; after completion of setting, the cement retainer 1 is fixed at a preset setting depth in a shaft, a matched insertion pipe is inserted into the first hollow cavity 111 in the central pipe 11, then the insertion pipe is inserted into the inner sliding sleeve 18, the inner sliding sleeve 18 is pushed to move, the third liquid through hole 184 on the inner sliding sleeve 18 is communicated with the first liquid through hole 112 and the second liquid through hole 192 to form a passage, cement is injected into the third hollow cavity 182 through the insertion pipe, and flows out to the outer side of the cement retainer 1 through the third liquid through hole 184, the first liquid through hole 112 and the second liquid through hole 192 to enter the shaft, and a cement paste blocking layer is formed on the lower side of the cement retainer 1 in the shaft, so that the blocking operation of a high-pressure water layer is completed; after the plugging operation is completed, the insertion pipe is pulled out, the insertion pipe drives the inner sliding sleeve 18 to move in the withdrawal process, and the inner sliding sleeve 18 moves to cut off the communication between the first liquid passing hole 112 and the third liquid passing hole 184, so that liquid or cement in a shaft can be effectively prevented from returning to the cement retainer 1 through the second liquid passing hole 192, the first liquid passing hole 112 and the third liquid passing hole 184, blind plugs are formed in the cement retainer 1, the shaft is fully plugged, cement at the lower part of the cement retainer 1 can be plugged below the cement retainer 1, the problem of liquid backflow can be effectively avoided, and normal operation of equipment is protected.
The cement retainer 1 provided by the application can greatly save the operation cost, meanwhile, the working procedure of setting the cement retainer 1 is simple, the working procedure is few, the working time can be saved, the working efficiency is improved, after the cement retainer 1 is set, the cement retainer 1 is firmly anchored with the inner wall of a casing, and the pressure from the lower part of the cement retainer 1 during the well shaft sealing of an oil-gas well is born.
As shown in fig. 1 and 2, the cement retainer 1 further includes a push ring 16, the push ring 16 is sleeved on the outer wall surface of the central pipe 11, the first slip assembly 12 is connected with the limiting portion 113 through the push ring 16, wherein the outer diameter of the limiting portion 113 is larger than the outer diameter of the central pipe 11, and thus the push ring 16 can be clamped by the limiting portion 113, and the cement retainer 1 is matched in use. The cement retainer 1 is matched with a setting adapter, connected with a setting tool and then put into a well, after reaching the designed setting depth, the setting tool is triggered to generate certain thrust to push the push ring 16 to move downwards, and the rubber cylinder 17 is extruded and elastically deformed to be in contact with the inner wall of the sleeve to form initial sealing. When the thrust force is greater than the rupture force of the upper slip seat and the lower slip seat, the slip seat is ruptured and moves along the conical surfaces of the upper cone and the lower cone until the slip teeth are tightly anchored with the inner wall of the sleeve; when the thrust provided by the setting tool is continuously increased until the thrust is larger than the limit stress of the connecting pin of the setting adapter and the central tube 11, the pin is broken by breaking, the setting and releasing actions are completed, the cement retainer 1 is left at the designed setting depth, the setting tool is recovered, the cement retainer 1 is left at the designed setting depth, the rubber cylinder 17 is arranged outside the cement retainer 1, and the well bore is fully plugged after the rubber cylinder 17 is set.
As shown in fig. 1 and 2, the cement retainer 1 further includes a second slip assembly 13 and a second cone sleeve, the second slip assembly 13 and the second cone sleeve are sequentially sleeved on the outer wall surface of the central tube 11 from the glue barrel 17 to the lower joint 19, the glue barrel 17 is connected with the lower joint 19 through the second slip assembly 13 and the second cone sleeve, the second slip assembly 13 is wedge-shaped, a second inclined plane matched with the second slip assembly 13 is arranged on the second cone sleeve, the second inclined plane is inclined from outside to inside along the direction from the glue barrel 17 to the lower joint 19, in this embodiment, two slip assemblies are arranged on two sides of the glue barrel 17, and simultaneously, the two slips are respectively matched with the corresponding cone sleeve, so that the design of the double slips can bear pressure bidirectionally, and the cement retainer 1 is anchored more stably.
When the cement retainer 1 is used, the cement retainer 1 is connected with a setting tool through an adapter, because the setting tools selected by field operation are different, the cement retainer 1 can be placed into an oil-gas well casing through tools such as an oil pipe, a drill pipe, a continuous oil pipe, a cable and the like, and is set in the oil-gas well casing through the setting tools such as hydraulic pressure, the cable and the like, after the cement retainer 1 is connected with the setting tool through the adapter, the cement retainer 1 is placed into a shaft according to a conventional placing mode of the cement retainer 1, and a push rod of the setting tool passes through a first hollow cavity 111 of a central pipe 11 to be connected with a pin, so that the position of the lower joint 19 is fixed; then the setting tool is pushed to squeeze the central tube 11, the central tube 11 pushes the first slip assembly 12 to move towards the side of the first cone sleeve, the second slip assembly 13 moves towards the side of the second cone sleeve, the first slip assembly 12 moves outwards along the first inclined surface of the first cone sleeve, the second slip assembly 13 moves outwards along the second inclined surface of the second cone sleeve, the outer wall surfaces of the first slip assembly 12 and the second slip assembly 13 squeeze the inner wall of a shaft, the first slip assembly 12 and the second slip assembly 13 prop against the inner wall of the shaft, then the central tube 11 is continuously squeezed, the central tube 11 pushes the first slip assembly 12 and the second slip assembly 13 to move together and squeeze the rubber cylinder 17, and the rubber cylinder 17 is compressed, deformed and expanded between the first slip assembly 12 and the second slip assembly 13 and squeezes the inner wall of the shaft, so that setting is completed.
As shown in fig. 1 and 2, the inner sleeve 18 includes a connecting section 181 and a locking section, the inner diameter of the locking section is larger than the inner diameter of the connecting section 181, the connecting section 181 is close to the lower joint 19 and is cylindrical, the third liquid through hole 184 is disposed on the connecting section 181, and the cylindrical connecting section 181 is internally provided with the third hollow cavity 182 with two open ends; the locking section comprises a plurality of strip-shaped locking claws 183 made of elastic materials, one ends of the locking claws 183 are respectively connected with one end of the connecting section 181 to form a cylindrical locking section, gaps are formed between two adjacent locking claws 183, the other end of each locking claw 183 is provided with a protruding part protruding outwards, a circle of annular mounting groove 114 is formed in the inner wall of the central tube 11, the protruding part is positioned in the mounting groove 114, one end, close to the lower joint 19, of the mounting groove 114 is provided with a guide inclined surface, and the guide inclined surface is inclined inwards from outside to outside along the direction from the central tube 11 to the lower joint 19; a short rod 193 is arranged in the second hollow cavity 191, the end of the central tube 11 abuts against the short rod, and when the end of the connecting section 181, which is far away from the locking section, abuts against the short rod 193, the first liquid through hole 112 is communicated with the third liquid through hole 184.
After the cement retainer 1 is set, the cement retainer 1 is put into a matched insertion pipe, the insertion pipe enters the first hollow cavity 111 in the central pipe 11 and then is inserted into the inner sliding sleeve 18, at the moment, the protruding parts on the locking claws 183 are clamped in the mounting grooves 114, and because the locking section is of a cylindrical structure surrounded by a plurality of locking claws 183, and each locking claw 183 is made of elastic materials, when the insertion pipe is pushed, the protruding parts on the locking claws 183 can slide out of the mounting grooves 114 along the guide inclined planes, so that the inner sliding sleeve 18 can be pushed to move in the direction of the lower joint 19, and after the locking claws 183 slide out of the mounting grooves 114, the space surrounded by the plurality of locking claws 183 is reduced, so that the locking claws 183 can lock the insertion pipe, and when the protruding parts are positioned in the mounting grooves 114, the first through liquid holes 112 and the third through liquid holes 184 are not communicated; pushing the inner sliding sleeve 18 to move towards the lower joint 19 until the connecting part of the inner sliding sleeve 18 abuts against the short rod 193, and at the moment, the third through-liquid hole 184, the first through-liquid hole 112 and the second through-liquid hole 192 are communicated with each other to form a passage, so that cement is injected into the third hollow cavity 182 through the insertion pipe, flows out to the outer side of the cement retainer 1 through the third through-liquid hole 184, the first through-liquid hole 112 and the second through-liquid hole 192 and enters a shaft, and a cement paste blocking layer is formed at the lower side of the cement retainer 1 in the shaft, so that the blocking operation of the high-pressure water layer is completed; after the plugging operation is completed, the insertion tube is pulled out, the locking claw 183 is driven to lock the insertion tube in the inserting and withdrawing process, so that the inner sliding sleeve 18 moves along with the insertion tube until the protruding part on the inner sliding sleeve 18 is clamped into the mounting groove 114, at the moment, the locking claw 183 loosens the insertion tube, the inner sliding sleeve 18 is fixed in the first hollow cavity 111, the insertion tube is pulled out and recovered continuously, at the moment, the inner sliding sleeve 18 moves to cut off the communication between the first liquid passing hole 112 and the third liquid passing hole 184, and liquid or cement in a shaft can be effectively prevented from returning into the cement retainer 1 through the second liquid passing hole 192, the first liquid passing hole 112 and the third liquid passing hole 184, blind plugs are formed inside, the cement at the lower part of the cement retainer 1 is plugged completely, the problem of backflow of liquid can be effectively avoided, and normal operation of equipment can be protected.
Preferably, the slip teeth are made of cast iron material, the packing 17 is made of rubber material, the central tube 11 and the inner slip sleeve 18 are made of aluminum material, and the second cone sleeve 15, the second cone sleeve, the push ring 16 and the lower joint 19 are made of soluble metal material. The second cone sleeve 15, the second cone sleeve, the push ring 16 and the lower joint 19 are made of soluble metal materials, after the operation is finished, the second cone sleeve 15, the second cone sleeve, the push ring 16 and the lower joint 19 can be automatically dissolved or degraded in a downhole liquid environment, the dissolving or degrading time can be adjusted in advance through the dissolving or degrading speed of the soluble metal materials and the soluble rubber materials, the purpose of dissolving or degrading the cement retainer 1 in the set time is achieved, part of aluminum parts can be completely dissolved or only needs to be ground, and the grinding time is greatly shortened, so that the defects of the existing cast iron cement retainer 1 are fundamentally overcome.
As shown in fig. 1 and 2, the first slip assembly 12 and the second slip assembly 13 each comprise a slip bowl and slip teeth, the slip teeth are arranged on the slip bowl, which are more beneficial to being meshed with the inner wall of the casing, the volume of the slip teeth is very small, and the slip bowl and the slip teeth are of an integral structure by utilizing a flowback, so that the whole slip mechanism is optimized, wherein the first slip assembly 12 and the second slip assembly 13 are of a tooth-inlaid structure, the upper surface is provided with 3 teeth, and the lower surface is provided with 4 teeth; the metal ceramic is adopted as the slip teeth, the slip seat is still made of soluble materials, the hardness is high, the size is small, the distribution is reasonable, and the setting is more effective.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art. Furthermore, in the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The foregoing description of the preferred embodiments of the application is not intended to limit the application to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the application are intended to be included within the scope of the application.
Claims (7)
1. A cement retainer, characterized in that: the inner sliding sleeve is inserted into the second hollow cavity of the lower joint, a third hollow cavity is formed in the inner sliding sleeve, the inner sliding sleeve is positioned in the first hollow cavity, a first liquid passing hole is formed in the central tube, a second liquid passing hole communicated with the first liquid passing hole is formed in the lower joint, a third liquid passing hole communicated with the third hollow cavity is formed in the inner sliding sleeve, and the inner sliding sleeve slides in the first hollow cavity to be communicated with the first liquid passing hole or cut off the communication of the first liquid passing hole and the third liquid passing hole; the method comprises the steps of carrying out a first treatment on the surface of the
A limiting part is arranged on the outer wall of the other end of the central tube, and a first slip assembly, a first cone sleeve and a rubber sleeve are sequentially sleeved on the outer side of the central tube along the direction from the limiting part to the lower joint;
the first slip assembly is connected with the limiting part, the rubber sleeve is connected with the lower joint, the first slip assembly is wedge-shaped, the first cone sleeve is provided with a first inclined surface matched with the first slip assembly, and the first inclined surface inclines from inside to outside along the direction from the limiting part to the rubber sleeve.
2. The cement retainer as recited in claim 1, wherein: the cement retainer further comprises a push ring, the push ring is sleeved on the outer wall surface of the central pipe, and the first slip assembly is connected with the limiting part through the push ring.
3. The cement retainer as recited in claim 2, wherein: the cement retainer further comprises a second slip assembly and a second cone sleeve, the second slip assembly and the second cone sleeve are sequentially sleeved on the outer wall surface of the central tube from the rubber cylinder to the lower joint, the rubber cylinder is connected with the lower joint through the second slip assembly and the second cone sleeve, the second slip assembly is wedge-shaped, a second inclined surface matched with the second slip assembly is arranged on the second cone sleeve, and the second inclined surface is inclined from outside to inside along the direction from the rubber cylinder to the lower joint.
4. A cement retainer as claimed in claim 3, wherein: the first slip assembly and the second slip assembly comprise slip seats and slip teeth, the slip seats are sleeved on the outer side of the central pipe, and the slip teeth are fixedly arranged on the outer surface of the slip seats.
5. The cement retainer as claimed in any one of claims 1 to 4, wherein: the inner sliding sleeve comprises a connecting section and a locking section which are connected, the inner diameter of the locking section is larger than that of the connecting section, the connecting section is close to the lower joint and is cylindrical, the third liquid through hole is formed in the connecting section, and the cylindrical connecting section is internally provided with a third hollow cavity with two open ends;
the locking section includes a plurality of long banding locking claws of making by elastic material, a plurality of locking claw's one end respectively with the one end of linkage segment links to each other and constitutes cylindric locking section, and adjacent two form the gap between the locking claw, every locking claw's the other end all is equipped with outside convex protruding portion, round annular mounting groove on the inner wall of center tube, protruding portion is located the mounting groove, the mounting groove is close to the one end of lower clutch is equipped with the direction inclined plane, the direction inclined plane is outwards inwards inclined along the direction of center tube to lower clutch.
6. The cement retainer as recited in claim 5, wherein: the second hollow cavity is internally provided with a short rod, the end part of the central tube is propped against the short rod, and when one end of the connecting section, which is far away from the locking section, is propped against the short rod, the first liquid through hole is communicated with the third liquid through hole.
7. The cement retainer as recited in claim 4, wherein: the slip teeth are made of cast iron materials, the rubber sleeve is made of rubber materials, the central tube and the inner sliding sleeve are made of aluminum materials, and the first cone sleeve, the second cone sleeve, the push ring and the lower joint are made of soluble metal materials.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810004098.6A CN108035694B (en) | 2018-01-03 | 2018-01-03 | Cement retainer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810004098.6A CN108035694B (en) | 2018-01-03 | 2018-01-03 | Cement retainer |
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| CN108035694A CN108035694A (en) | 2018-05-15 |
| CN108035694B true CN108035694B (en) | 2023-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12000239B2 (en) | 2023-04-13 | 2024-06-04 | Saudi Arabian Oil Company | Modular additive cementing |
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| CN110080715A (en) * | 2019-05-27 | 2019-08-02 | 成都英诺思科技有限公司 | A kind of cement retainer |
| US11655687B2 (en) | 2020-10-23 | 2023-05-23 | Saudi Arabian Oil Company | Modular additive cementing |
| CN113279722A (en) * | 2021-06-09 | 2021-08-20 | 门万龙 | Packer for oil exploitation |
| CN114809371B (en) * | 2022-04-29 | 2023-11-10 | 广东珠江工程总承包有限公司 | Energy-saving heat-insulating wall body for assembled building |
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| CN108035694A (en) | 2018-05-15 |
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