CN216691063U - Wellhead partial pressure water injection device for ground seal inspection and single-layer independent well washing - Google Patents
Wellhead partial pressure water injection device for ground seal inspection and single-layer independent well washing Download PDFInfo
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- CN216691063U CN216691063U CN202122762312.4U CN202122762312U CN216691063U CN 216691063 U CN216691063 U CN 216691063U CN 202122762312 U CN202122762312 U CN 202122762312U CN 216691063 U CN216691063 U CN 216691063U
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Abstract
The utility model relates to the field of oilfield separate-layer water injection, in particular to a wellhead partial pressure water injection device for ground seal inspection and single-layer independent well flushing, which is used for solving the problems that the sealing condition of a packer cannot be directly judged and the efficiency is low in the existing separate-layer water injection technology. When the water injection channel is blocked and reverse well washing operation is needed, the problem that well washing fails because well washing liquid cannot flow through each water injection layer section exists; partial pressure water injection device simple structure, packer sealing performance ground verification in the pit, sealed effect is direct to be judged, and can carry out the verification of packer sealing performance, independent layer section well-flushing passageway at any time, mutual noninterference at the well-flushing in-process has advantages such as well-flushing effect is more thorough better.
Description
Technical Field
The utility model relates to the field of oilfield separate-layer water injection, in particular to a wellhead partial pressure water injection device for ground seal inspection and single-layer independent well flushing.
Background
In order to maintain formation pressure, oil fields typically employ injection of water into the formation. In order to alleviate the contradiction between the layers, separate-zone water injection is often adopted, namely water is injected into different layers by using a separate-zone water injection string, wherein the separate-zone water injection string generally comprises a plurality of packers and water injection devices, the packers can separate the strata, and the water injection devices respectively inject water into different strata. In practical application, the separated layer water injection pipe column needs to realize the functions of seal checking and reverse well washing of the packer besides water injection.
In the process of implementing the present invention, the utility model finds that the prior art has at least the following problems: when the packer is tested and sealed, the zonal water injection pipe column provided by the related technology is usually used for carrying a seal testing instrument with a pressure gauge to be put into the zonal water injection pipe column, the pressure changes of the oil pipe and the sleeve pipe of each water injection layer are respectively recorded, and whether the packer is sealed or not is judged by replaying on the ground. The problem that the sealing condition of the packer cannot be directly judged and the efficiency is low exists. When the water injection channel is blocked and reverse well washing operation is needed, the problem that well washing liquid cannot flow through each water injection layer section, so that well washing is ineffective exists.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem of the existing separate-layer water injection string, the utility model provides a wellhead partial pressure water injection method and device for ground seal inspection and single-layer independent well flushing.
The technical scheme of the utility model is as follows: the utility model provides a wellhead partial pressure water injection method with the functions of ground seal inspection and single-layer independent well flushing. The wellhead partial pressure water injection method with the ground seal checking and single-layer independent well flushing functions comprises a ground seal checking method and a single-layer independent well flushing method.
The ground seal inspection method actually verifies the sealing performance of the upper-layer packer and the lower-layer packer in the field implementation process, so that water is respectively injected into the upper layer and the lower layer.
The seal checking method of the upper layer packer and the lower layer packer can adopt the mode of independently checking the upper layer packer and the lower layer packer respectively, and can also be used for checking the upper layer packer and the lower layer packer simultaneously.
The method for testing the individual ground seal of the upper packer is characterized in that: the method is realized by the following steps:
(1) before the seal inspection of the upper packer is carried out, the sleeve switch valve and the sleeve switch valve are closed;
(2) opening an upper-layer regulating valve, and allowing the pressurized liquid of the main water injection pipe to enter an annular pipe formed by the outer pipe and the inner pipe through the upper-layer water injection pipe;
(3) recording the pressure change conditions of the upper pressure gauge and the sleeve pressure gauge;
(4) closing the upper regulating valve;
(5) repeating the step (2) to the step (4);
(6) if the casing pressure gauge does not change with the upper pressure gauge pressure, the upper packer (19) is sealed, otherwise it is not sealed.
The method for testing the individual ground sealing of the lower packer is characterized in that: the method is realized by the following steps:
(1) before the lower packer is tested, the sleeve switch valve, the upper regulating valve and the sleeve switch valve are closed;
(2) opening an upper-layer regulating valve, and allowing the pressurized liquid of the main water injection pipe to enter an annular pipe formed by the outer pipe and the inner pipe through the upper-layer water injection pipe;
(3) recording the pressure change conditions of the upper pressure gauge and the lower pressure gauge;
(4) closing the upper regulating valve;
(5) repeating the step (2) to the step (4);
(6) if the pressure gauge of the lower layer does not change along with the pressure of the pressure gauge of the upper layer, the lower layer packer is sealed, otherwise, the lower layer packer is not sealed.
The method for simultaneously testing the upper packer and the lower packer is characterized in that: the method is realized by the following steps:
(1) before seal checking, closing the sleeve switch valve, the upper layer regulating valve and the sleeve switch valve;
(2) opening an upper-layer regulating valve, and allowing the pressurized liquid of the main water injection pipe to enter an annular pipe formed by the outer pipe and the inner pipe through the upper-layer water injection pipe;
(3) recording the pressure change conditions of the sleeve pressure gauge, the upper pressure gauge and the lower pressure gauge;
(4) closing the upper regulating valve;
(5) repeating the step (2) to the step (4);
(6) if the sleeve pressure gauge and the lower-layer pressure gauge do not change along with the pressure of the upper-layer pressure gauge, the upper-layer packer and the lower-layer packer are completely sealed.
The wellhead partial pressure water injection method with the single-layer independent well flushing function is actually characterized in that an annular pipe and a water injection pipe are formed by an inner pipe, an inner pipe and an outer pipe in the field implementation process
The annular pipe, the upper water injection port and the lower water injection port formed by the outer pipe and the sleeve are periodically cleaned to ensure smooth water injection and water injection amount. Comprises an upper water injection channel and an upper water injection port and a lower water injection channel and a lower water injection port.
The cleaning method of the upper water injection channel and the upper water injection port is characterized in that: the method is realized by the following steps:
(1) closing the sleeve switch valve, the upper layer regulating valve, the lower layer regulating valve and the lower layer liquid outlet;
(2) opening a sleeve switch valve, and allowing the pressurized liquid of the main water injection pipe to enter an annular pipe formed by the outer pipe and the sleeve through the sleeve water injection pipe;
(3) flow through upper packing) and then enter upper water injection);
(4) the sewage is discharged from an upper-layer liquid outlet after passing through an annular pipe formed by the inner pipe and the outer pipe, and is recovered by a sewage tank truck and then is treated in a centralized way;
(5) and cleaning the upper water injection channel and the upper water injection port.
The cleaning method of the lower water injection channel and the lower water injection port is characterized in that: the method is realized by the following steps:
(1) closing the sleeve switch valve, the upper layer regulating valve, the lower layer regulating valve and the upper layer liquid outlet (SCK);
(2) opening a sleeve switch valve, and allowing the pressurized liquid of the main water injection pipe to enter an annular pipe formed by the outer pipe and the sleeve through the sleeve water injection pipe;
(3) after flowing through the upper layer packer and the lower layer packer, the water enters a lower layer water injection port;
(4) the sewage is discharged from a lower-layer liquid outlet through an inner pipe and is recycled through a sewage tank truck for centralized treatment;
(5) and cleaning the upper water injection channel and the upper water injection port.
A wellhead partial pressure water injection method with the functions of ground seal inspection and single-layer independent well flushing is realized by the following wellhead partial pressure water injection devices: the method is characterized in that: the well flushing device mainly comprises a main water injection pipe, a well flushing fluid injection pipe, an upper water injection pipe, a lower water injection pipe, an upper flow regulating valve, a sleeve switch valve, an upper flow meter, a lower pressure meter, an upper pressure meter, a well head isolator, a sleeve pressure meter, a well flushing fluid switch valve, an outer pipe, an upper water injection port, a lower water injection port, an inner pipe, an upper packer, a downhole isolator, a lower packer, a sleeve and a plug. Wherein total water injection pipe and flushing fluid injection pipe, upper water injection pipe, lower floor's water injection pipe are connected through the welded mode, realize upper strata and lower floor's water injection in the pit through upper water injection pipe and lower floor's water injection pipe. The upper water injection pipe is sleeved with the lower flow regulating valve, the upper flow meter and the upper pressure meter. The upper flow regulating valve, the lower flow meter and the lower pressure gauge are sleeved on the lower water injection pipe. The flushing fluid injection pipe is sleeved with a sleeve switch valve. The wellhead isolator is sleeved on the inner pipe, and the downhole isolator is sleeved on the inner pipe. A plug) is connected with the outer pipe through screw threads.
Compared with the prior art, the utility model has the following advantages:
simple structure, packer sealing performance ground are verified in the pit, and sealed effect is direct to be judged, and can carry out packer sealing performance's verification, independent interval well-flushing passageway at any time, at well-flushing in-process noninterference, have advantages such as well-flushing effect more thoroughly effect is better.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a single seal test curve for an upper packer according to the present invention.
FIG. 3 is a single seal verification curve for a lower packer of the present invention.
FIG. 4 is a simultaneous seal verification curve for an upper packer and a lower packer of the present invention.
FIG. 5 is a schematic view of the method for cleaning the upper water injection passage and the upper water injection port according to the present invention.
FIG. 6 is a schematic view of the lower water injection passage and the lower water injection port cleaning method according to the present invention.
Detailed Description
The utility model is further described below with reference to the accompanying drawings:
the advantages and features of the present invention will become apparent from the description of FIGS. 1-6. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model, and that such changes and substitutions are intended to be within the scope of the utility model.
A well mouth partial pressure water injection method with ground seal checking and single-layer independent well washing functions. The wellhead partial pressure water injection method with the ground seal checking and single-layer independent well flushing functions comprises a ground seal checking method and a single-layer independent well flushing method.
The ground seal inspection method actually verifies the sealing performance of the upper-layer packer 19 and the lower-layer packer 20 in the field implementation process, so that water injection of the upper layer and the lower layer is realized respectively.
The seal checking method of the upper packer 19 and the lower packer 21 can adopt the mode of independently checking the upper packer 19 and the lower packer 21 respectively, and can also be used for checking the upper packer 19 and the lower packer 21 simultaneously.
The first embodiment is as follows: the method for testing the seal of the upper packer 19 on the ground independently is characterized in that: the method is realized by the following steps:
(1) before the seal inspection of the upper packer 19 is carried out, the casing switch valve 7 and the casing switch valve 13 are closed;
(2) opening the upper regulating valve 6, and allowing the pressurized liquid of the main water injection pipe 1 to enter an annular pipe formed by the outer pipe 15 and the inner pipe 18 through the upper water injection pipe 3;
(3) recording the pressure change conditions of an upper pressure gauge 11 and a sleeve pressure gauge 14;
(4) close the upper regulating valve 6)
(5) Repeating the step (2) to the step (4);
(6) if the casing pressure gauge 14 does not vary with the pressure in the upper pressure gauge 11, it indicates that the upper packer 19 is sealed, and not otherwise (as shown in FIG. 2).
The second embodiment is as follows: the method for testing the single ground seal of the lower packer 21 is characterized in that: the method is realized by the following steps:
(1) before the lower packer 21 is tested, closing the casing switch valve 7, the upper regulating valve 5 and the casing switch valve 13;
(2) opening the upper regulating valve 6, and allowing the pressurized liquid of the main water injection pipe 1 to enter an annular pipe formed by the outer pipe 15 and the inner pipe 18 through the upper water injection pipe 3;
(3) recording the pressure change conditions of the upper pressure gauge 11 and the lower pressure gauge 10;
(4) closing the upper regulating valve 6;
(5) repeating the steps (2) to (4);
(6) if the lower pressure gauge 10 does not vary with the pressure in the upper pressure gauge 11, it indicates that the lower packer 21 is sealed, and vice versa (as shown in FIG. 3).
The third concrete implementation mode: the method for simultaneously testing the upper packer 19 and the lower packer 21 is characterized in that: the method is realized by the following steps:
(1) before seal checking, closing the sleeve switch valve 7, the upper layer regulating valve 5 and the sleeve switch valve (13);
(2) opening the upper regulating valve 6, and allowing the pressurized liquid of the main water injection pipe 1 to enter an annular pipe formed by the outer pipe 15 and the inner pipe 18 through the upper water injection pipe 3;
(3) recording the pressure change conditions of a sleeve pressure gauge 14, an upper pressure gauge 11 and a lower pressure gauge 10;
(4) closing the upper regulating valve 6;
(5) repeating the step (2) to the step (4);
(6) if the casing pressure gauge 14 and the lower pressure gauge 10 do not change with the pressure of the upper pressure gauge 11, it indicates that the upper packer 19 and the lower packer 21 are all sealed (as shown in FIG. 4).
The wellhead partial pressure water injection method with the single-layer independent well flushing function is actually characterized in that the inner part of the inner pipe 18, the annular pipe formed by the inner pipe 18 and the outer pipe 15 and the annular pipe are combined in the field implementation process
The outer pipe 15 and the annular pipe formed by the sleeve 22, the upper water injection port 16 and the lower water injection port 17 are periodically cleaned to ensure smooth water injection and water injection amount. Comprises a method for cleaning an upper-layer water injection channel and an upper-layer water injection port 16 and a method for cleaning a lower-layer water injection channel and a lower-layer water injection port 17.
The fourth concrete implementation mode: the method for cleaning the upper water injection channel and the upper water injection port 16 (as shown in fig. 5) is characterized in that: the method is realized by the following steps:
(1) closing the sleeve switch valve 13, the upper layer regulating valve 6, the lower layer regulating valve 5 and the lower layer liquid outlet XCK;
(2) opening a sleeve switch valve 7, and allowing the pressurized liquid of the main water injection pipe 1 to enter an annular pipe formed by an outer pipe 15 and a sleeve 22 through a sleeve water injection pipe 2;
(3) flows through an upper packer 19 and then enters an upper water injection port 16;
(4) the waste water is discharged from an upper liquid discharge port SCK through an annular pipe formed by the inner pipe 18 and the outer pipe 15, and is recycled through a sewage tank truck and then is subjected to centralized treatment;
(5) the cleaning of the upper water injection passage and the upper water injection port 16 is completed.
The fifth concrete implementation mode: the method for cleaning the lower water injection channel and the lower water injection port 17 (as shown in fig. 6) is characterized in that: the method is realized by the following steps:
(1) closing the sleeve switching valve 13, the upper layer regulating valve 6, the lower layer regulating valve 5 and the upper layer liquid outlet SCK;
(2) opening a sleeve switch valve 7, and allowing the pressurized liquid of the main water injection pipe 1 to enter an annular pipe formed by an outer pipe 15 and a sleeve 22 through a sleeve water injection pipe 2;
(3) after flowing through the upper packer 19 and the lower packer 21, the water enters the lower water injection port 17;
(4) is discharged from a lower-layer liquid outlet XCK through an inner pipe 18 and is recovered by a sewage tank truck for centralized treatment;
(5) the cleaning of the upper water injection passage and the upper water injection port 16 is completed.
Claims (1)
1. The utility model provides a well head partial pressure water injection device that ground seal is tested and individual layer is independently washed well which characterized in that: mainly comprises a main water injection pipe (1), a flushing fluid injection pipe (2), an upper layer water injection pipe (3), a lower layer water injection pipe (4), an upper flow regulating valve (5), a sleeve switch valve (7), an upper flow meter (8), a lower flow meter (9), a lower pressure meter (10), an upper pressure meter (11), a well mouth isolator (12), a sleeve pressure meter (13), a flushing fluid switch valve (14), an outer pipe (15), an upper water injection port (16), a lower water injection port (17), an inner pipe (18), an upper packer (19), a downhole isolator (20), a lower packer (21), a sleeve (22) and a plug (23), wherein the main water injection pipe (1), the flushing fluid injection pipe (2), the upper layer water injection pipe (3) and the lower layer water injection pipe (4) are connected in a welding manner, and the upper layer and lower layer downhole water injection is realized through the upper layer water injection pipe (3) and the lower layer water injection pipe (4), the lower flow control valve (6) is sleeved on the upper water injection pipe (3), the upper flow meter (8) and the upper pressure meter (11) are sleeved on the upper water injection pipe (4), the upper flow control valve (5) is sleeved on the lower flow meter (9) and the lower pressure meter (10), the sleeve switch valve (7) is sleeved on the flushing fluid injection pipe (2), the well head isolator (12) is sleeved on the inner pipe (18), the underground isolator (20) is sleeved on the inner pipe (18), and the plug (23) is in threaded connection with the outer pipe (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122762312.4U CN216691063U (en) | 2021-11-11 | 2021-11-11 | Wellhead partial pressure water injection device for ground seal inspection and single-layer independent well washing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122762312.4U CN216691063U (en) | 2021-11-11 | 2021-11-11 | Wellhead partial pressure water injection device for ground seal inspection and single-layer independent well washing |
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| CN216691063U true CN216691063U (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122762312.4U Active CN216691063U (en) | 2021-11-11 | 2021-11-11 | Wellhead partial pressure water injection device for ground seal inspection and single-layer independent well washing |
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| CN (1) | CN216691063U (en) |
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2021
- 2021-11-11 CN CN202122762312.4U patent/CN216691063U/en active Active
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