CN114109299B - Stage cementing device for top cementing and method thereof - Google Patents
Stage cementing device for top cementing and method thereof Download PDFInfo
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- CN114109299B CN114109299B CN202010874342.1A CN202010874342A CN114109299B CN 114109299 B CN114109299 B CN 114109299B CN 202010874342 A CN202010874342 A CN 202010874342A CN 114109299 B CN114109299 B CN 114109299B
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- opening
- seat
- closing
- cementing
- sleeve
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 238000012856 packing Methods 0.000 claims abstract description 28
- 239000002195 soluble material Substances 0.000 claims abstract description 18
- 239000012530 fluid Substances 0.000 claims abstract description 16
- 239000012266 salt solution Substances 0.000 claims description 13
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 239000011253 protective coating Substances 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 230000000670 limiting effect Effects 0.000 claims description 2
- 239000012267 brine Substances 0.000 claims 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims 1
- 238000005553 drilling Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000004090 dissolution Methods 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 150000001804 chlorine Chemical class 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
Abstract
The invention provides a stage cementing device for top cementing, comprising: a body; an opening assembly provided in the body, including an opening sleeve and an opening seat provided in the opening sleeve, the opening sleeve covering a circulation hole of the body and the opening seat covering a liquid inlet groove of the body in an initial state; and a packer comprising a packing element having a fluid-containing chamber. The opening seat can respond to a first-time pressure-holding and downstream movement in the body to open the liquid inlet groove after the primary well cementation is finished, so that liquid in the body can enter the liquid containing cavity to cause the expansion of the rubber cylinder. The one-time pressure build-up is achieved by the lowering of an opening tool which can be engaged with the opening seat. Both the opening seat and the opening tool are made of a soluble material. The invention also provides a stage cementing method for top cementing.
Description
Technical Field
The invention relates to the petroleum well cementation technology, in particular to a stage cementing device, and especially relates to a packing type stage cementing device for top cementing and a stage cementing method for top cementing by using the device.
Background
The well cementation technology is an important technical link in the process of drilling and completing well. The quality of cementing directly affects subsequent hydrocarbon recovery operations.
The stage cementing process is a common process in the well cementing art. Screen top cementing completion techniques are common techniques for horizontal well completion operations, with typical string combinations being screen + blind + casing external packer + differential pressure stage cementing.
For the pipe column, the lowering speed of the pipe column needs to be controlled in the well entering process, so that the problem that the stage cementing device is started in advance due to pressure fluctuation is avoided. In addition, when the top cementing device ends up drilling, the stage cementing device and the casing may be damaged, and if severe, casing windowing may result, the wellbore being scrapped. In addition, the drilled aluminum block cannot be fully circulated, which can cause down-hole junk and affect later operations. At the same time, improper operating parameters can damage the sizing hoops and sleeves.
To this end, fishing type drill-free stage cementing devices have been developed and used. However, such a fishing type drill-free stage cementing device is complicated in structure and requires a fishing tool to be lowered for fishing. Meanwhile, the fishing device is easy to block during fishing and even cannot be lifted. And once the fishing fails, the post-treatment difficulty is high, the period is long, and the speed and efficiency are difficult to realize.
Disclosure of Invention
In view of the above problems, the present invention provides a packing type stage cementing apparatus for top cementing and a stage cementing method for top cementing using the same.
According to one aspect of the present invention there is provided a stage cementing apparatus for top cementing comprising: a hollow cylindrical body having an inner cavity, a through circulation hole being provided in a wall of the body, and a liquid inlet tank being opened toward the inner cavity; an opening assembly disposed within the body, the opening assembly including an opening sleeve and an opening seat disposed within the opening sleeve, wherein in an initial state, the opening sleeve covers the circulation hole and the opening seat covers the liquid inlet groove; and the packer comprises a rubber cylinder with a liquid containing cavity and a runner communicated with the liquid containing cavity. The opening seat can respond to one-time pressure-holding downstream movement in the body to open the liquid inlet groove, so that liquid entering the inner cavity of the body during primary well cementation can enter the liquid containing cavity through the liquid inlet groove and the flow passage, and the packing element is caused to expand. The one-time pressure build-up is achieved by the insertion of an opening tool which can be engaged with the opening seat. The opening seat and the opening tool are both made of a soluble material.
In a preferred embodiment, a receptacle made of a soluble material is also provided at the lower end of the opening sleeve for limiting the travel of the downstream movement of the opening seat.
In a preferred embodiment, the opening sleeve is movable downstream in response to a secondary hold-down in the body, thereby opening the circulation hole and closing the liquid inlet tank.
In a preferred embodiment, a closing sleeve is provided upstream of the opening sleeve, in which closing sleeve a closing seat is provided. Wherein the closing sleeve is configured to move downstream in response to three pressure build-ups in the body during secondary cementing to close the circulation orifice.
In a preferred embodiment, the three pressure build-up is achieved by lowering a closing tool which can be engaged with the closing seat, wherein both the closing seat and the closing tool are made of a soluble material.
In a preferred embodiment, the soluble material is a graphene-based soluble aluminum alloy or soluble rubber that is soluble in a salt solution.
In a preferred embodiment, the opening seat, the receiving seat and the closing seat are each coated with a protective coating insoluble in a chlorine salt solution.
In a preferred embodiment, the salt solution is a greater than 5% KCl solution.
According to another aspect of the present invention there is provided a stage cementing method for top cementing, wherein the stage cementing apparatus is utilized, the method comprising the steps of: the step cementing device is put into place along with a pipe column; the opening tool is put into engagement with the opening seat to perform one-time pressure-holding so that the opening seat moves downstream to the receiving seat to open the liquid inlet groove, so that liquid enters the liquid containing cavity through the inner cavity of the body, the liquid inlet groove and the flow channel, and the rubber cylinder is expanded; performing secondary pressure holding to enable the opening sleeve to move downwards to open the circulation hole, and simultaneously cutting off the communication between the liquid inlet groove and the flow channel; after the secondary cementing operation, a closing tool is put into engagement with a closing seat, three times of pressure holding are carried out, so that a closing sleeve moves downwards to close a circulation hole again, and meanwhile, saline solution and completion fluid are injected; the opening tool, the opening seat, the receiving seat, the closing tool and the closing seat are dissolved by using a salt solution.
In a preferred embodiment, saline solution is also injected prior to the lowering of the opening tool.
In the expansion packer type stage cementing device for top cementing according to the present invention, the pipe string is constructed to be non-closed. Therefore, the problem of pressure fluctuation does not exist in the cementing process, and the problem of advanced expansion of the packer or advanced opening of the classifying hoop caused by pressure fluctuation due to improper running speed of the closed tubular column is solved.
In addition, according to the expansion packing type stage cementing device for top cementing of the present invention, the packer section seals the annulus, thereby realizing the protection of the lower reservoir, while the stage cementing section realizes the cementing operation of the packer top.
In addition, each plug seat and each rubber plug are made of soluble materials, and can be automatically dissolved in the environment of saline solution after well cementation is finished. There is no need to run a string drilling tool to drill out these accessories, nor is there any need to perform fishing operations on these. Therefore, the well construction period is greatly shortened, the operation cost is reduced, and the construction efficiency is improved.
In addition, a protective coating is provided on the surface of the plug seat (e.g., the opening seat, the receiving seat, and the closing seat) to prevent the plug seat from being dissolved in the drilling fluid containing chloride ions in advance.
Drawings
The invention will be described in more detail below by means of illustrative exemplary embodiments with reference to the accompanying drawings. In the figure:
FIG. 1 shows the overall structure of a stage cementing apparatus for top cementing in accordance with one embodiment of the present invention, wherein the apparatus is in an initial state;
FIG. 2 is an enlarged view of a portion of the device of FIG. 1, showing the position of the opening seat and the opening sleeve;
FIG. 3 shows a stage cementing device for top cementing according to the present invention with the packing element in an expanded state but with the circulation orifices still closed;
FIG. 4 shows a stage cementing device for top cementing according to the present invention wherein the packing element is in an expanded state and the circulation holes have been opened;
FIG. 5 is a partial schematic view of a stage cementing apparatus for top cementing according to the present invention, showing the circulation orifices again in a closed condition;
FIG. 6 shows an opening tool according to one embodiment of the invention; and
Fig. 7 shows a closing tool according to an embodiment of the invention.
In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further described with reference to the drawings. Hereinafter, the directional terms "downstream", "downward", etc. refer to a direction away from the wellhead, while "upstream", "upward", etc. refer to a direction toward the wellhead.
Fig. 1 shows a schematic construction of a stage cementing apparatus for top cementing according to the present invention. In this particular embodiment, the stage cementing device is an expansion packer stage cementing device 10.
As shown in fig. 1, the expansion-seal type stage cementing device 10 includes a hollow cylindrical body 100. The body 100 includes an interior cavity 110 formed therein, a circulation hole 120 extending through a wall of the body, and a sump 130 (see fig. 2) in communication with the interior cavity 110 but not extending through a wall of the body. An upper joint 140 is connected to the upstream end of the body 100 for connecting other components of the sleeve. A liquid inlet tank 130 is provided downstream of the circulation hole 120. The circulation holes 120 are circulation holes for secondary cementing, the function of which is well known in the art and will not be described in detail herein. The function of the liquid inlet tank 130 will be described in detail below.
In accordance with the present invention, an opening assembly 300 is provided within the cylindrical body 100 of the expansion-packing type stage cementing apparatus 10, which includes an opening sleeve 310 disposed within the body 100 and an opening seat 320 disposed within the opening sleeve 310. According to the present invention, the opening seat 320 is made of a soluble material. Wherein, in an initial state as shown in fig. 1, the opening sleeve 310 is coupled to the body 100 by the first shear pin 180 and covers the circulation hole 120. As shown in fig. 2, the opening seat 320 is connected to the opening sleeve 310 by the second shear pin 182, and covers the liquid inlet tank 130. In the embodiment shown in fig. 1 and 2, the first shear pin 180 is disposed downstream of the circulation aperture 120, but upstream of the second shear pin 182. Wherein the shear stress of the first shear pin 180 is set to be greater than the shear stress of the second shear pin 182, i.e., the second shear pin 182 will shear prior to the first shear pin 180.
The term "initial state" is also referred to herein as "first state", i.e., a state before the circulation hole 120 is opened. Figures 1 to 3 show the stage cementing apparatus 10 in an initial state. The term "soluble material" refers to a material that is soluble in the environment of a salt solution, such as graphene-based, its soluble aluminum alloy or soluble rubber, and the like. The term "salt solution" refers to a salt solution containing chloride ions, such as a KCl solution, preferably a KCl solution greater than 5%.
In addition, the opening assembly 300 may further include a socket 330 according to one embodiment of the present invention. As shown more clearly in fig. 2, the receptacle 330 is secured within the opening sleeve 310, for example by threads, preferably disposed at the downstream end of the opening sleeve 310. The receiving seat 330 serves to receive the opening seat 320 which moves downward, i.e., to define a stroke of the downward movement of the opening seat 320. This downward movement of the opening seat 320 will be described in detail below. According to the invention, the receptacles 330 are made of a soluble material.
As shown in fig. 1, the expansion-packer type stage cementing device 100 further comprises a packer 200, which is disposed downstream of the cylindrical body 100, in accordance with the present invention. The packer 200 includes a packing valve body 210 fixedly connected to the downstream end of the body 100, such as by threaded engagement. The sealing valve body 210 is, for example, a cylindrical structure, and has a step 215 on an inner wall thereof. The packer 200 also includes a base pipe 250 fixedly connected to, for example, the downstream end of the packing valve body 210, and a packing 220 disposed outside of the base pipe 250. In the illustrated embodiment, the upstream end of the base pipe 250 extends into the interior cavity of the packing valve body 210 and is threadably connected to the downstream end of the packing valve body 210. A lower joint 270 is provided at the downstream end of the barrel 220. The lower sub 270 is used with a short sleeve 272 secured thereto to connect with subsequent tools.
As shown in fig. 2, the packing valve body 210 includes an axially extending flow passage 230 therein that communicates with the fluid sump 130 in the body 100 (specific communication details are not shown in the cross section of fig. 2). The flow passage 230 extends axially through the packing valve body 210. In addition, as shown in fig. 1, the packing element 220 includes a liquid containing chamber 240 in communication with the flow channel 230. The fluid chamber 240 may also be formed to extend axially within the barrel 230. In an alternative embodiment, the liquid containing chamber 240 may be formed by a gap between the base pipe 250 and the packing element 230. Furthermore, two support sleeves 260 are provided at the outside of the packing element 230, which are spaced apart from each other. Wherein a first support sleeve 260 upstream is connected to the packing valve body 210 and a second support sleeve 260 downstream is connected to the lower joint 270. The two support sleeves 260 may be used to limit the axial position at which the expansion of the packing element 220 occurs. That is, the portion of the packing element 220 between the two support sleeves 260 can expand outwardly.
Further, as shown in fig. 1, a closing sleeve 450 is also provided in the body 100 upstream of the opening sleeve 310. In the initial state, the closing sleeve 450 directly abuts against the opening sleeve 310 and is connected to the body 100 by the third shear pin 184. A closing seat 460 is provided at the upper end of the closing sleeve 450. According to the invention, the closing seat 460 is made of a soluble material. In a preferred embodiment, as shown in fig. 5, a snap spring 462 is provided on the outer wall of the closing sleeve 450, and a snap spring groove 118 is provided on the inner wall of the body 100, which can be engaged with the snap spring 462. The specific function of the closure sleeve 450 and closure seat 460, and the circlip 462 and circlip groove 118 will be described below.
As shown in fig. 1 and 2, in an initial state, the opening sleeve 310 of the opening assembly 300 is coupled to the body 100 by the first shear pin 180 and covers the circulation hole 120. At the same time, the opening seat 320 of the opening assembly 300 is coupled to the opening sleeve 310 by the second shear pin 182, and covers the liquid inlet tank 130. At this time, the inner cavity 110 of the body 100 is not in communication with the flow passage 230 within the packing valve body 210 of the packer 200. In this way, displacement fluid entering the interior cavity 110 of the body 100 during primary cementing slurry cannot enter the flow passage 230 in the packing valve body 210 of the packer 200.
In the stage cementing method for top cementing according to the present invention, an expansion packer stage cementing device 10 is run down the string. And circulating for one week after the pipe column is lowered to the preset position. At this stage, a saline solution may preferably be injected to ensure that the plug seat and subsequently the lower part of the opening tool 400 that is lowered down is also in the saline solution, ensuring and accelerating the dissolution of the lower part.
Thereafter, as shown in fig. 3, when an opening tool 400 as shown in fig. 6 is put into the expansion packing type stage cementing apparatus 10 according to the present invention, the opening tool 400 is engaged with the opening seat 320 during the descending process, thereby blocking the inner chamber 110 of the body 100. The second shear pin 182 shears by performing a hold-down in the body 100 (which is referred to herein as "one-shot hold-down"). In this case, the opening tool 400 moves downward together with the opening seat 320 until the opening seat 320 abuts on the receiving seat 330. At this time, the liquid inlet groove 130 is no longer blocked by the opening seat 320 due to the downward movement of the opening seat 320, thereby communicating with the inner cavity 110. In this way, the displacement fluid in the inner cavity 110 can enter the fluid containing cavity 240 in the rubber cylinder 220 through the fluid inlet groove 130 and the fluid channel 230 in the sealing valve body 210. In this way, the packing element 220 expands to adhere to the well wall, isolating the annulus into upper and lower parts, thereby avoiding the upper cement sinking to pollute the reservoir.
Thereafter, the pressure build-up (which is referred to herein as "secondary pressure build-up") in the body 100 is continued, such that the first shear pin 180 shears. In this case, the opening sleeve 310 can move downward relative to the body 100 until it abuts against the step 215 of the packing valve body 210, as shown in fig. 4. At this time, the circulation hole 120 is exposed, and the liquid inlet groove 130 is blocked again by the opening sleeve 310 moving downward, thereby cutting off its communication with the inner cavity 110 again. In this case, a secondary cementing operation may be performed.
In the secondary circulation and cementing process, after cementing is completed, a shut-off tool 410 as shown in fig. 7 may be lowered and replaced. The alternate slurry includes a salt solution and a completion fluid. As shown in fig. 5, when the closing tool 410 is dropped onto the closing seat 460 and forms a seal, the upper portion of the closing seat 460 forms a closed cavity. At this time, a pressure is applied in the body 100 (which is referred to herein as "three pressure application") so that the third shear pin 184 shears. In this way, the closing sleeve 450 descends with respect to the main body 110 and closes the circulation hole 120 again. In this position, the latch spring 462 provided on the outer wall of the closing sleeve 450 enters the latch spring slot 118 provided on the inner wall of the body 100. By engagement of the snap spring 462 and the snap spring groove 118, reverse movement of the closure sleeve 450 is prevented, thereby achieving permanent closure of the circulation hole 120.
According to the invention, the opening means 400 is preferably a flexible opening plug, while the closing means 410 is preferably a closing plug. Meanwhile, the closing tool 410 and the opening tool 400 are both made of a soluble material.
According to a preferred embodiment of the invention, all of the plug seats, namely the opening seat 320, the receiving seat 330 and the closing seat 460, are coated with a protective coating insoluble in chlorine salt solution. Thus, in the case where the drilling fluid contains chloride ions, the plug seats (i.e., the open seat 320, the receiving seat 330, and the closed seat 460) that are in contact with the drilling fluid are not dissolved in advance due to the presence of the protective coating. After the plug seat contacts the plug or other base, the protective coating ruptures under contact pressure, exposing the soluble material therein. In this case, the soluble material of the plug seat (e.g., graphene-based material) may come into contact with the injected salt solution, so that dissolution occurs. Thus, the dissolution rate can be controlled so that dissolution occurs at a desired timing.
In the expansion packer type stage cementing device for top cementing according to the present invention, the pipe string is constructed to be non-closed. Therefore, the problem of pressure fluctuation does not exist in the cementing process, and the problem of advanced expansion of the packer or advanced opening of the classifying hoop caused by pressure fluctuation due to improper running speed of the closed tubular column is solved.
According to the present invention, after the completion of the well cementation, accessories (including parts of the opening tool 400, the closing tool 410, the opening seat 320, the receiving seat 330, the closing seat 460, etc.) all made of soluble materials are dissolved in the injected saline solution environment, thereby realizing the full diameter. At the same time, running a string drill tool to drill out these accessories is not required, nor is it necessary to perform fishing operations on these. Therefore, the well construction period is greatly shortened, the operation cost is reduced, and the construction efficiency is improved.
While the invention has been described with reference to a preferred embodiment in this embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any way in the absence of structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (6)
1. A stage cementing device (10) for top cementing, comprising:
A hollow cylindrical body (100) having an inner cavity (110), a through circulation hole (120) being provided in a wall of the body, and a liquid inlet tank (130) opening toward the inner cavity;
An opening assembly (300) disposed within the body, the opening assembly comprising an opening sleeve (310) and an opening seat (320) disposed within the opening sleeve (310), wherein in an initial state, the opening sleeve (310) covers the circulation hole (120) and the opening seat (320) covers the liquid inlet groove (130); and
A packer (200) comprising a packing element (220) having a fluid receiving chamber (240), and a flow passage (230) in communication with the fluid receiving chamber (240),
Wherein the opening seat (320) is capable of opening the liquid inlet groove (130) in response to a first-time pressure-holding downstream movement in the body (100), whereby liquid entering the inner cavity (110) of the body (100) during primary cementing is capable of entering the liquid containing cavity (240) through the liquid inlet groove (130) and the flow passage (230), thereby causing the packing element (220) to expand,
The one-time pressure build-up is achieved by inserting an opening tool (400) which can be engaged with the opening seat (320), and
Both the opening seat (320) and the opening tool (400) are made of a soluble material,
A receiving seat (330) made of a soluble material is also provided at the lower end of the opening sleeve (310) for limiting the travel of the downstream movement of the opening seat (320),
The opening sleeve (310) is capable of moving downstream in response to a secondary hold-down in the body (100) to open the circulation hole (120) and close the liquid inlet groove (130),
The opening seat (320) and the receiving seat (330) are coated with a protective coating insoluble in saline solution,
A closing sleeve (450) is provided upstream of the opening sleeve (310), a closing seat (460) is provided within the closing sleeve (450), wherein the closing sleeve (450) is configured to be able to move downstream in response to three pressure build-ups in the body (100) during secondary cementing, thereby closing the circulation orifice (120),
The three-time pressure build-up is achieved by the insertion of a closing tool (410) which can be engaged with the closing seat (460), wherein both the closing seat (460) and the closing tool (410) are made of a soluble material.
2. The stage cementing apparatus of claim 1 wherein the soluble material is a graphene-based soluble aluminum alloy or a soluble rubber that is soluble in a salt solution.
3. The stage cementing apparatus as claimed in claim 2, wherein the shutoff seat (460) is coated with a protective coating that is insoluble in saline solution.
4. The stage cementing apparatus of claim 2 wherein the salt solution is greater than 5% KCl solution.
5. A stage cementing method for top cementing, wherein the stage cementing apparatus of any one of claims 1 to 4 is utilized, the method comprising the steps of:
lowering the stage cementing device (10) into position with a tubular string;
lowering the opening tool (400) to be engaged with the opening seat (320), and performing one-time pressure-holding to enable the opening seat (320) to move downstream to the receiving seat (330) to open the liquid inlet groove (130), so that liquid enters the liquid containing cavity (240) through the inner cavity (110) of the body (100), the liquid inlet groove (130) and the flow channel (230), and the rubber cylinder (220) is expanded;
Performing secondary pressure holding to enable the opening sleeve (310) to move downwards to open the circulation hole (120), and simultaneously cutting off communication between the liquid inlet groove (130) and the flow channel (230);
After the secondary cementing operation, the closing tool (410) is lowered to be engaged with the closing seat (460), the closing sleeve (450) is moved downwards by three times of pressure holding, the circulation hole (120) is closed again, and meanwhile, the saline solution and the completion fluid are injected;
the opening tool (400), the opening seat (320), the receiving seat (330), the closing tool (410) and the closing seat (460) are dissolved by means of a salt solution.
6. The stage cementing method of claim 5 wherein the brine solution is injected prior to running the open tool (400).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010874342.1A CN114109299B (en) | 2020-08-27 | 2020-08-27 | Stage cementing device for top cementing and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010874342.1A CN114109299B (en) | 2020-08-27 | 2020-08-27 | Stage cementing device for top cementing and method thereof |
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| CN114109299A CN114109299A (en) | 2022-03-01 |
| CN114109299B true CN114109299B (en) | 2024-04-19 |
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