CN109707335B - Completion string and completion method - Google Patents
Completion string and completion method Download PDFInfo
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- CN109707335B CN109707335B CN201711006460.5A CN201711006460A CN109707335B CN 109707335 B CN109707335 B CN 109707335B CN 201711006460 A CN201711006460 A CN 201711006460A CN 109707335 B CN109707335 B CN 109707335B
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Abstract
The invention provides a well completion string and a well completion method, wherein the well completion string comprises a string, the string is provided with a casing, a staged injector arranged in the casing, a packer arranged on the outer wall of the casing and positioned at the lower end of the staged injector, and a shearable ball seat arranged in the casing and positioned at the lower end of the packer; the rubber plug component can be arranged in the pipe string and matched with the inner sliding sleeve of the stage injector; the ball can be dropped into the interior of the string and matched with the ball seat, wherein the inner sliding sleeve, the rubber plug component, the ball seat and the ball are all made of materials capable of being dissolved in the well completion fluid, and the well completion string can ensure that the full drift diameter can be economically and safely realized.
Description
Technical Field
The invention relates to the technical field of petroleum well completion, in particular to a well completion pipe column and a well completion method.
Background
At present, in the technical field of well cementing and completion of oil exploitation and geothermal energy exploitation, a well completion method of cementing the top of a sieve tube is often adopted. The well completion method is a well completion method with quick effect and high yield after well construction.
In the well completion operation, in order to realize the full drift diameter, in the prior art, a mode of drilling a drilling tool to drill out an internal accessory of the stage injector and the like is often adopted. This approach requires re-tripping the rig, is cumbersome to operate, and greatly increases time and economic costs. In addition, the internal accessories of the stage injector and the like can be lifted out of the shaft in a salvage mode. The disadvantage of this operation is that the next drilling is still needed after the completion operation, and there are also problems of complicated operation, increased time cost and economic cost. Moreover, the above method also has the risk of fishing failure.
Thus, it is the skilled person in the art for a more economical and safe completion string and completion method to be used for the technical problem to be solved.
Disclosure of Invention
In response to some or all of the above problems, the present invention provides a completion string and a method of completing a well. The inner sliding sleeve and the ball seat can be sheared off in a mode of continuously pumping the completion fluid after the completion operation, and the inner sliding sleeve and the rubber plug assembly, and the ball seat are constructed into accessories dissolved in the completion fluid, so that the inner sliding sleeve and the rubber plug assembly, and the ball seat are finally decomposed in the completion fluid, and the full drift diameter of the pipe string is realized. The mode need not go into extra pipe cluster down to the inner chamber of tubular column and salvage or bore and remove, and the construction mode is simple, and the efficiency of construction is high simultaneously.
According to a first aspect of the present invention there is provided a completion string comprising:
a pipe string which is provided with a casing, a stage water injector arranged in the casing, a packer arranged on the outer wall of the casing and positioned at the lower end of the stage water injector, and a ball seat which is arranged in the casing and positioned at the lower end of the packer and can be cut off,
a rubber plug component which can be arranged inside the pipe string and is matched with the inner sliding sleeve of the stage injector,
a ball which can be dropped into the interior of the string and which cooperates with the ball seat,
wherein, the inner sliding sleeve, the rubber plug component, the ball seat and the ball are all made of materials which can be dissolved in the well completion fluid.
In one embodiment, the inner sliding sleeve, the rubber plug component, the ball seat and the ball are all made of magnesium alloy materials, and an anti-dissolution layer is arranged on the surface of the magnesium alloy.
In one embodiment, the thickness of the anti-dissolution layer of the ball is 8-15 microns, the thickness of the anti-dissolution layer of the rubber plug assembly is 5-12 microns, and the thickness of the anti-dissolution layer of the inner sliding sleeve and the ball seat is 15-25 microns.
According to another aspect of the present invention, there is provided a method of completing a well, comprising:
step one, a pipe string of the pipe column is put into a well,
step two, throwing a ball into the inner cavity of the pipe string, pumping well completion fluid into the inner cavity of the pipe string to ensure that the ball is matched with the ball seat, setting the packer and opening a circulating hole of the stage water injector,
step three, after cement is injected into the inner cavity of the pipe string, well completion fluid is pumped into the inner cavity of the pipe string to enable the rubber plug component in the inner cavity of the pipe string to move downwards, the well completion fluid is continuously pumped to enable the rubber plug component to be matched with the inner sliding sleeve, the pump pressure is continuously carried out and the circulation hole is closed,
pumping the well completion fluid into the inner cavity of the pipe string to enable the inner sliding sleeve to slip off the rubber plug assembly and the ball to shear off the ball seat.
In one embodiment, in step two, at 0.5-1m3The/min displacement pumps completion fluid into the inner cavity of the string to engage the ball with the ball seat.
In one embodiment, in the second step, after the ball is matched with the ball seat, the distance between the ball seat and the ball seat is 0.1-0.2m3And the displacement per minute is continuously pressed, and after the pressure reaches the sealing expansion pressure of the triggering packer, the pressure is continuously pressed for 1-2min after every 1MPa rise and pressure stabilization until the sealing expansion pressure of the packer is finished so as to set the packer.
In one embodiment, in step two, the packer is setAfter the formation, the thickness is 0.5-1m3And (4) pressurizing the pipe again by the displacement per min until the opening pressure value of the circulation hole of the stage water injector, continuously pumping the completion fluid, and stopping pumping the completion fluid when the annular slurry return of the wellhead is found.
In one embodiment, in step three, 1-2m is used3The/min displacement pumps completion fluid to move the plug assembly down.
In one embodiment, in step four, at greater than 0m3Min is less than 0.5m3And pumping the completion fluid at a displacement of/min, and separating the inner sliding sleeve slip from the staged cementing device slip when the pressure reaches the inner sliding sleeve shearing pressure, wherein the inner sliding sleeve shearing pressure is 12-18 MPa.
In one embodiment, the displacement is set to 0.2-0.5m after the inner sleeve slips and the stage grouter slips are separated3Min, when the pressure reaches the ball seat shearing pressure, the ball seat is separated from the casing, wherein the shearing pressure of the ball seat is 3-5MPa greater than that of the inner sliding sleeve.
Compared with the prior art, the invention has the advantages that: because the inner sliding sleeve and the rubber plug component of the well completion string, and the ball seat are all made of materials which can be dissolved in the well completion fluid, when the well completion string is used for well completion operation, the inner sliding sleeve and the ball seat can be cut off in a mode of continuously pumping the well completion fluid, so that the inner sliding sleeve and the rubber plug component, and the ball seat are finally decomposed in the well completion fluid. The well completion pipe column can realize full drift diameter without fishing or drilling additional pipe strings into the inner cavity of the pipe column, and has simple construction mode and high construction efficiency.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 schematically illustrates a running state diagram of a string of completion strings in accordance with an embodiment of the present invention;
FIG. 2 schematically illustrates a post-string balling state diagram of a completion string in accordance with an embodiment of the present invention;
FIG. 3 schematically illustrates a post-string packer set status diagram of a completion string in accordance with an embodiment of the present invention;
FIG. 4 schematically illustrates a plug assembly displacement cement status diagram of a string of a completion string in accordance with an embodiment of the present invention;
FIG. 5 schematically illustrates a diagram of a combination of a plug assembly and an inner slip sleeve of a string of a completion string according to an embodiment of the present invention;
FIG. 6 schematically illustrates a cut-away condition of the sliding sleeve and ball seat within the completion string in accordance with an embodiment of the present invention;
in the drawings, like parts are provided with like reference numerals. The drawings are not to scale.
Detailed Description
The invention will be further explained with reference to the drawings.
Fig. 5 shows a completion string 100 according to the present invention. As shown in fig. 5, completion string 100 includes string 90, plug assembly 2, and ball 3. As shown in fig. 1, among other things, the string 90 includes a casing 4, a stage injector 5, a packer 6, and a ball seat 7. The casing 4 mainly serves as a connection and extends in the wellbore. A stage injector 5 is arranged inside the casing 4. The packer 6 is provided on the outer wall of the casing 4 and at the lower end of the stage injector 5 for packing the annulus between the string 90 and the tubing. A ball seat 7 is provided in the casing 4 at the lower end of the packer 6 for cooperating with the ball 3 to close off the inner cavity of the string 90. During completion, the plug assembly 2 can be moved down the bore of the string 90 to achieve cement replacement. In addition, the rubber plug assembly 2 can be matched with an inner sliding sleeve 51 of the stage water injector 5 and can plug the inner cavity of the stage water injector 5. The ball 3 can cooperate with the ball seat 7 to close off the inner bore of the ball seat 7. According to the present invention, the inner sliding sleeve 51, the plug assembly 2, the ball seat 70 and the ball 7 are made of a material that can be dissolved in completion fluid.
Thus, using the completion string 100 for completion operations, the inner sleeve 51 and ball seat 70 may be sheared off by continuing pumping of completion fluid such that the inner sleeve 51 and plug assembly 2 and ball 3 and ball seat 7 are eventually dissolved in the completion fluid. This well completion tubular column 100 need not go into extra pipe cluster to salvage or bore and remove also can realize full latus rectum in the inner chamber of tubular column 100, and its construction method is fairly simple, and the efficiency of construction is high, and construction cost is low simultaneously, and the security is high.
In one embodiment, in order to achieve the dissolution and completion of the internal sliding sleeve 51, the rubber plug assembly 2, the ball seat 7 and the ball 3, they are made of magnesium alloy material. And in order to ensure the smooth construction operation and avoid the early dissolution of each component, an anti-dissolution layer is arranged on the surface of the magnesium alloy. For example, the magnesium alloy material comprises 15 to 20 wt% of aluminum, 5.5 to 15 wt% of copper, 0.1 to 1.9 wt% of zinc, 0.6 to 1.4 wt% of zirconium, and the balance of magnesium, wherein the sum of the weight percentages of the components is 100%. The anti-dissolution layer comprises two layers. The inner layer is an organic coating processed by a chemical conversion coating, wherein the chemical conversion coating solution comprises the following components in percentage by mass: 10-20% of barium oxalate, 2-5% of potassium bismuth tartrate, 2-5% of potassium antimony tartrate, 1-5% of allyl alcohol, 1-5% of cyclohexylamine and 70-80% of water. The outer layer is a heat-resistant organic coating, wherein the mass fraction of each component is as follows: 25-45% of fluorine modified polymer resin, 20-40% of epoxy silicon resin, 10-20% of butyl acetate, 5-10% of isocyanate and 5-10% of amino polyamide.
Preferably, the thickness of the anti-solvent layer of the spheres 3 is 8-15 microns, wherein the thickness of the inner organic coating is 1-3 microns. The thickness of the anti-dissolution layer of the rubber plug component 2 is 5-12 microns, wherein the thickness of the organic coating of the inner layer is 1-3 microns. The thickness of the anti-dissolving layer of the inner sliding sleeve 51 and the ball seat 7 is 15-25 microns, wherein the thickness of the inner organic coating is 1-3 microns. Through setting up internal sliding sleeve 51, plug subassembly 2, ball seat 7 and ball 3 to the smooth going on of above-mentioned structure can be guaranteed the construction.
A method of completing a well using the completion string 100 is described in detail below with respect to fig. 1-6.
First, as shown in FIG. 1, a string of pipes 90 is lowered into the well.
After the pipe string 90 is lowered to the designed position, the ball 3 is thrown into the inner cavity of the pipe string 90. Then, at 0.5-1m3The displacement of/min pumps completion fluid into the bore of the string 90 to engage the ball 3 with the ball seat 7, as shown in figure 2. At this point, the lumen of the tube string 90 is sealed. Then, the discharge capacity is reduced to 0.1-0.2m3Min continues pumping completion fluid into the string 90. After the pressure reaches the sealing pressure triggering the packer 6 to expand, after the pressure rises by 1MPa and the pressure is stabilized for 1-2min, the pressure is continuously increased until the packer 6 is completely expanded and the packer 6 is set, as shown in figure 3. The pressing mode can ensure that the packer 6 is fully expanded and sealed so as to ensure the safety of packing. After the packer 6 is sealed, the pressure is released to zero. Then, at 0.5-1m3And (4) pressurizing the pipe again by the displacement per min until the opening pressure value of the circulation hole of the stage water injector, continuously pumping the completion fluid, and stopping pumping the completion fluid when the annular slurry return of the wellhead is found. At which point a loop is established.
Cement slurry is pumped into the lumen of the string 90. After the injection is completed, the rubber plug assembly 2 is arranged in the inner cavity of the tube string 90. Using 1-2m3The displacement of/min pumps completion fluid to move the plug assembly downward for slurry replacement as shown in figure 4. When the plug assembly 2 reaches the stage injector 5, the plug assembly 2 enters the inner sliding sleeve 51 of the stage injector. And the inner sliding sleeve 51 drives the stage water injector 5 to close the circulation hole 52, as shown in fig. 5.
Closing the circulation hole 52 and then continuing to hold the pressure to be more than 0m3Min is less than 0.5m3The displacement of/min pumps the completion fluid, and when the pressure reaches the shearing pressure of the inner sliding sleeve 51, the inner sliding sleeve 51 slips and separates from the stage cementing device 5. Wherein the shearing pressure of the inner sliding sleeve 51 is 12-18 MPa. The pressure in the lumen of the string 90 is then transferred to the ball seat 7 position, creating a build up of pressure as the ball 3 blocks the bore of the ball seat 7. At this time, the displacement is set to 0.2-0.5m3Min, when the pressure reaches the ball seat 7 shear pressure, the ball seat 7 is separated from the casing 4. Wherein the shearing pressure of the ball seat 7 is configured to be 3-5MPa greater than that of the inner sliding sleeve 51. Eventually, the inner sliding sleeve 51, the plug assembly 2, the ball seat 70 and the ball 7 all fall to the bottom of the string of pipes 90, as shown in fig. 6. Through the arrangement, smooth on-site construction can be ensured. Specifically, during the on-site construction, the pressure change can be clearly observed, thereby judging whether the inner sliding sleeve 51 and the ball seat 7 are cut off.
In the present application, the terms "upper" and "lower" are used with reference to the actual operating orientation of completion string 100.
While the invention has been described with reference to a preferred 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 embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A completion string, comprising:
a string having a casing, a stage injector disposed within the casing, a packer disposed on an outer wall of the casing and located at a lower end of the stage injector, and a shearable ball seat disposed within the casing and located at a lower end of the packer,
a rubber plug component which can be arranged inside the pipe string and is matched with the inner sliding sleeve of the stage injector,
a ball capable of being dropped into the interior of the string and engaging the ball seat,
wherein the inner sliding sleeve, the rubber plug assembly, the ball seat and the ball are all made of materials which can be dissolved in completion fluid.
2. The completion string according to claim 1, wherein the inner sliding sleeve, the rubber plug assembly, the ball seat and the ball are all made of magnesium alloy material, and an anti-dissolution layer is arranged on the surface of the magnesium alloy.
3. A completion string according to claim 2, wherein the thickness of the anti-dissolution layer of the ball is 8-15 μm, the thickness of the anti-dissolution layer of the plug assembly is 5-12 μm, and the thickness of the anti-dissolution layers of the inner sliding sleeve and the ball seat is 15-25 μm.
4. A method of completing a well, comprising:
step one, running the string of pipe strings according to any one of claims 1 to 3 into a well,
step two, the ball is put into the inner cavity of the pipe string, and then well completion fluid is pumped into the inner cavity of the pipe string to ensure that the ball is matched with the ball seat, the packer is set, and a circulation hole of the stage water injector is opened,
step three, after cement is injected into the inner cavity of the pipe string, well completion fluid is pumped into the inner cavity of the pipe string to enable the rubber plug component in the inner cavity of the pipe string to move downwards, the well completion fluid is continuously pumped to enable the rubber plug component to be matched with the inner sliding sleeve, the pump pressure is continuously carried out, and the circulation hole is closed,
pumping the well completion fluid into the inner cavity of the pipe string to enable the inner sliding sleeve to slip off the rubber plug assembly, and the ball to shear off the ball seat.
5. A completion method according to claim 4, wherein in step two, the distance between 0.5 and 1m is measured3A displacement of/min pumps completion fluid into the inner cavity of the tubing string to engage the ball with the ball seat.
6. A completion method according to claim 4 or 5, wherein in step two, after the ball is fitted with the ball seat, the ball is set to 0.1-0.2m3And the displacement per min, continuously pressurizing, and after the pressure reaches the pressure triggering the expansion sealing of the packer, continuously pressurizing for 1-2min after the pressure rises by 1MPa every time and stabilizing the pressure until the expansion sealing of the packer is finished so as to set the packer.
7. A completion method according to claim 6, wherein in step two, after completion of setting of the packer, 0.5-1m is used3And (4) pressurizing the displacement in the pipe again in the min until the opening pressure value of the circulation hole of the stage water injector, continuously pumping the completion fluid, and stopping pumping the completion fluid when the annular slurry return of the wellhead is found.
8. A completion method according to claim 4 or 5, wherein in step three, 1-2m is used3A/min displacement pumps completion fluid to move the plug assembly down.
9. A completion method according to claim 4 or 5, wherein in step four, the distance between the first and second wells is greater than 0m3Min is less than 0.5m3A/min displacement pump-out completion fluid, the inner sleeve slip is separated from the stage cementing device slip when the pressure reaches the inner sleeve shear pressure, wherein the inner sleeve shear pressure is configured to be 12-18 MPa.
10. A method of completing a well according to claim 9 wherein the displacement is set to 0.2-0.5m after the inner sleeve slip is separated from the stage cementing slip3Min, when the pressure reaches the ball seat shear pressure, the ball seat is separated from the casing, wherein the shear pressure of the ball seat is configured to be 3-5MPa greater than the shear pressure of the inner sliding sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711006460.5A CN109707335B (en) | 2017-10-25 | 2017-10-25 | Completion string and completion method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711006460.5A CN109707335B (en) | 2017-10-25 | 2017-10-25 | Completion string and completion method |
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| CN109707335A CN109707335A (en) | 2019-05-03 |
| CN109707335B true CN109707335B (en) | 2020-11-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113803019B (en) * | 2020-06-15 | 2023-04-25 | 中国石油化工股份有限公司 | Well completion method and string for horizontal well |
| CN112302572A (en) * | 2020-11-09 | 2021-02-02 | 百勤能源科技（惠州）有限公司 | Soluble pump plug |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2132829Y (en) * | 1992-04-10 | 1993-05-12 | 胜利石油管理局钻井总公司固井公司 | Differential pressure staged cementing unit |
| EP2574720B1 (en) * | 2011-09-30 | 2015-02-25 | Welltec A/S | A downhole injection tool |
| CN103015955B (en) * | 2012-12-28 | 2015-06-24 | 中国石油集团渤海钻探工程有限公司 | Open-hole horizontal well multi-cluster sliding sleeve staged fracturing string and fracturing method thereof |
| CN106150428A (en) * | 2015-03-27 | 2016-11-23 | 中国石油化工股份有限公司 | Split type exempting from bores plug completion tubular column and completion method thereof |
| CN106437608B (en) * | 2016-10-10 | 2019-02-19 | 贵州高峰石油机械股份有限公司 | A kind of drilling-free sizing cementing method and cementing device |
| CN106917599A (en) * | 2017-04-27 | 2017-07-04 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | A kind of degradable cementing plug and fraclional well cementing device and method |
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