Gas storage liquid drainage and gas injection and production method and tubular column

Abstract

The invention discloses a gas storage liquid drainage and gas injection and production method and a tubular column, and is characterized in that under the working condition that a gas injection and production layer is positioned above a liquid drainage layer, a production sleeve, an oil pipe, an upper packer, an injection and production circulating valve, a lower packer and a liquid drainage circulating valve are arranged in the production sleeve in a concentric manner; the periphery of the upper portion of the oil pipe and the periphery of the lower portion of the oil pipe are packed through the upper packer and the lower packer respectively, the injection-production circulating valve is located in the oil pipe and located between the upper packer and the lower packer, and the liquid drainage circulating valve is located in the oil pipe and located below the lower packer. The functions of liquid drainage, gas injection and gas production are achieved on one integrated tubular column at the same time, the problems that during oil and gas reservoir type and aquifer gas storage building, well killing and tubular column lifting are needed in the liquid drainage and injection-production conversion process, reservoir pollution exists, the cost is high, and the well control risk is high can be solved, and the functions of a liquid drainage well and an injection-production well are unified; and the safety and the economical efficiency of building the storage cavern are improved.

Description

Technical Field

[0001] The invention relates to the technical field of gas production in petroleum engineering, in particular to a gas storage reservoir drainage and injection, gas production method and a pipe column. Background Art

[0002] Underground gas storage refers to a place where natural gas is stored in underground structures such as depleted gas reservoirs or oil and gas reservoirs, porous water-bearing rock formations, and salt rock formations. For the imbalance of seasonal gas supply and demand, underground gas storage with large gas storage capacity and strong regulation capacity is often used to solve it.

[0003] At present, China's gas storage construction is in a period of rapid development, especially for aquifer gas storage construction has just started, so the technical demand for related drainage, injection and production technology is very urgent. At present, some domestic depleted oil and gas reservoirs need to be drained during the construction process, and when aquifers are built, drainage is the key technology in the early construction process. Conventional processes are generally replaced with injection and production strings after the drainage is completed. In this process, well pressure and string lifting are required, which will pollute the reservoir, high cost, high well control risk and other problems. There is an urgent need for a gas reservoir drainage and injection and production method and string to provide technical means for drainage, injection and production of such gas storage. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a gas storage drainage and injection and production pipe string. By realizing the functions of drainage, gas injection and gas production on an integrated pipe string at the same time, it can solve the problems of needing to pressurize the well and lift the pipe string during the drainage and injection and production conversion process when building oil and gas reservoir type and aquifer gas storage reservoirs, resulting in reservoir pollution, high cost and high well control risk. The function unification of drainage wells and injection and production wells is realized, and the safety and economy of the construction of such storage reservoirs are improved.

[0005] The technical solution of the present invention for solving the above-mentioned technical problems is as follows: in the working condition where the injection and production layer is located above the drainage layer, the present invention comprises a production casing, an oil pipe, an upper packer, an injection and production circulation valve, a lower packer and a drainage circulation valve; the oil pipe is concentrically arranged inside the production casing, and the outer periphery of the upper part and the outer periphery of the lower part of the oil pipe are respectively sealed by the upper packer and the lower packer; the injection and production circulation valve is located in the oil pipe and between the upper packer and the lower packer; the drainage circulation valve is located in the oil pipe and below the lower packer.

[0006] The beneficial effects are:

[0007] By realizing the functions of drainage, gas injection and production on an integrated pipe string at the same time, it is possible to solve the problems of well pressure and pipe string lifting during the drainage and injection-production conversion process in the construction of oil and gas reservoir-type and aquifer gas storage reservoirs, which may cause reservoir pollution, high costs and high well control risks. The functions of drainage wells and injection-production wells are unified, which improves the safety and economy of the construction of such reservoirs.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, a downhole safety valve is provided in the upper part of the oil pipe, and the downhole safety valve is located above the upper packer.

[0010] The beneficial effect of adopting the above further scheme is that it can be used to provide downhole safety tools that can be shut down urgently in abnormal situations such as fire, pipeline rupture, and irresistible natural disasters (such as earthquakes, ice conditions, strong typhoons, etc.) in production facilities to prevent blowouts and ensure oil and gas well measures and production safety.

[0011] Furthermore, a first seating short circuit for sealing the upper packer is provided in the oil pipe, and the first seating short circuit is located between the upper packer and the injection-production circulation valve.

[0012] The beneficial effect of adopting the above further solution is that it is used for setting the upper packer or measuring formation parameters.

[0013] Furthermore, a second seating short circuit for seating the lower packer is provided in the oil pipe, and the second seating short circuit is located between the lower packer and the drainage circulation valve.

[0014] The beneficial effect of adopting the above further solution is that it is used for setting the lower packer or measuring formation parameters.

[0015] Furthermore, a shear ball seat is connected below the drainage circulation valve.

[0016] The beneficial effect of adopting the above further solution is to seal the upper packer or the lower packer or the channel for the fluid in the lower space to enter the oil pipe.

[0017] The present invention also provides a gas storage gas injection method, which uses the gas storage liquid discharge and injection and gas production pipe string, and the method comprises the following steps:

[0018] S1A, run the production casing;

[0019] S2A, lower the upper packer, injection and production circulation valve, lower packer and drainage circulation valve together with the oil pipe into the production casing;

[0020] S3A. Close the liquid circulation valve, open the injection-production circulation valve, and inject gas into the oil pipe.

[0021] The present invention also provides a gas storage gas production method, which uses the gas storage liquid discharge and injection and gas production pipe column, and the method comprises the following steps:

[0022] S1 B, run the production casing;

[0023] S2B, lower the upper packer, injection and production circulation valve, lower packer and drainage circulation valve together with the oil pipe into the production casing;

[0024] S3B. Close the liquid circulation valve, open the injection and production circulation valve, and complete the gas production work.

[0025] The present invention also provides a gas storage reservoir drainage method, which uses the gas storage reservoir drainage and injection and production pipe string, and the method comprises the following steps:

[0026] S1 C, run the production casing;

[0027] S2C, lower the upper packer, injection and production circulation valve, lower packer and drainage circulation valve together with the oil pipe into the production casing;

[0028] S3C, open the liquid circulation valve, close the injection and production circulation valve, and complete the liquid drainage work. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the present invention.

[0030] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0031] 1. Production casing; 2. Downhole safety valve; 3. Oil pipe; 4. Upper packer; 5. First location short circuit; 6. Injection and production circulation valve; 7. Lower packer; 8. Second location short circuit; 9. Drainage circulation valve; 10. Shear ball seat; 11. Injection and production layer; 12. Drainage layer. DETAILED DESCRIPTION

[0032] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0033] The present invention is to solve the problems of draining and injection-production conversion during the construction of oil and gas reservoir-type and aquifer gas storages, which require well pressure and pipe string, resulting in reservoir pollution, high costs, and high well control risks. The present invention provides a method for draining and injecting and producing gas in a gas storage and a pipe string to achieve the unified functions of draining wells and injection-production wells, thereby improving the safety and economy of such storage construction. The selection of injection and production layers is very important. A stratum with only a small amount of gas or liquid is selected. If the selected stratum has a high water content, drain the liquid first, and then perform injection and production.

[0034] Embodiment 1:

[0035] Depend on Figure 1 Provided is a gas storage drainage and injection and production pipe string, which is applied to the working condition where the injection and production layer 11 is located above the drainage layer 12, comprising a production casing 1, an oil pipe 3, an upper packer 4, an injection and production circulation valve 6, a lower packer 7 and a drainage circulation valve 9. The oil pipe 3 is concentrically arranged inside the production casing 1, and the outer periphery of the upper part and the outer periphery of the lower part of the oil pipe 3 are respectively sealed by the upper packer 4 and the lower packer 7. The injection and production circulation valve 6 is located in the oil pipe 3 and between the upper packer 4 and the lower packer 7. The drainage circulation valve 9 is located in the oil pipe 3 and below the lower packer 7. A shear ball seat 10 is connected below the drainage circulation valve 9.

[0036] Among them, the upper packer 4 is used to seal the annular space between the packer 1 and the wellhead section production casing 1 and the oil pipe 3, isolating the entry of natural gas and other media, and playing a role in protecting the production casing;

[0037] The lower packer 7 is used to seal the annular space between the packer 2 and the production casing 1 and the oil pipe 3 at the bottom of the well, isolating the formation fluid from entering the upper space;

[0038] The injection and production circulation valve 6 is used to open or close the passage between the injection and production layer 11 and the oil pipe 3;

[0039] The drainage circulation valve 9 is used to open the passage between the hot pot closing drainage layer 12 and the oil pipe 3.

[0040] Preferably, a downhole safety valve 2 is provided in the upper portion of the oil pipe 3 , and the downhole safety valve 2 is located above the upper packer 4 .

[0041] Preferably, a first seating short circuit 5 for seating the upper packer 4 is provided in the oil pipe 3, and the first seating short circuit 5 is located between the upper packer 4 and the injection and production circulation valve 6; a second seating short circuit 8 for seating the lower packer 7 is provided in the oil pipe 3, and the second seating short circuit 8 is located between the lower packer 7 and the drainage circulation valve 9.

[0042] Embodiment 2:

[0043] Implementation 2 is directed to a method for applying a gas storage reservoir to drain liquid and inject and inject gas into a gas production column, comprising the following steps:

[0044] S1A, run production casing 1;

[0045] S2A, lower the upper packer 4, the injection and production circulation valve 6, the lower packer 7 and the drainage circulation valve 9 together with the oil pipe 3 into the production casing 1;

[0046] S3A, close the liquid circulation valve 9, open the injection and production circulation valve 6, and inject gas into the oil pipe 3.

[0047] Embodiment three:

[0048] Embodiment 3 A gas production method for applying a gas storage reservoir to drain liquid and inject and produce gas pipe strings comprises the following steps:

[0049] S1 B, run production casing 1;

[0050] S2B, lower the upper packer 4, the injection and production circulation valve 6, the lower packer 7 and the drainage circulation valve 9 together with the oil pipe 3 into the production casing 1;

[0051] S3B, close the liquid circulation valve 9, open the injection and production circulation valve 6, and complete the gas production work.

[0052] Embodiment 4:

[0053] Embodiment 4 A method for draining gas storage and draining gas injection and production pipes includes the following steps:

[0054] S1 C, run production casing 1;

[0055] S2C, lower the upper packer 4, the injection and production circulation valve 6, the lower packer 7 and the drainage circulation valve 9 together with the oil pipe 3 into the production casing 1;

[0056] S3C, open the liquid circulation valve 9, close the injection and production circulation valve 6, and complete the liquid drainage work.

[0057] In the description of the present invention, it is necessary to understand that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred system or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0058] In the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

[0062] In the description of the present invention, it is necessary to understand that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred system or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0063] In the description of the present invention, “plurality” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0064] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas storage reservoir drainage and injection and production pipe string, which is applied to the working condition where the injection and production layer (11) is located above the drainage layer (12), characterized in that: The invention comprises a production casing (1), an oil pipe (3), an upper packer (4), an injection and production circulation valve (6), a lower packer (7) and a drainage circulation valve (9); the oil pipe (3) is concentrically arranged inside the production casing (1), and the outer periphery of the upper part and the outer periphery of the lower part of the oil pipe (3) are respectively sealed by the upper packer (4) and the lower packer (7); the injection and production circulation valve (6) is located inside the oil pipe (3) and between the upper packer (4) and the lower packer (7); and the drainage circulation valve (9) is located inside the oil pipe (3) and below the lower packer (7).

2. A gas storage reservoir drainage and injection and production string according to claim 1, characterized in that: A downhole safety valve (2) is provided in the upper part of the oil pipe (3), and the downhole safety valve (2) is located above the upper packer (4).

3. A gas storage reservoir drainage and injection and production string according to claim 1, characterized in that: A first seating short circuit (5) for sealing the upper packer (4) is provided in the oil pipe (3); the first seating short circuit (5) is located between the upper packer (4) and the injection-production circulation valve (6).

4. A gas storage reservoir drainage and injection and production string according to claim 2, characterized in that: A second seating short circuit (8) for sealing the lower packer (7) is provided in the oil pipe (3); the second seating short circuit (8) is located between the lower packer (7) and the drainage circulation valve (9).

5. A gas storage reservoir drainage and injection and production string according to any one of claims 1 to 4, characterized in that: The lower part of the drainage circulation valve (9) is connected to a shear ball seat (10).

6. A gas storage gas injection method, which uses a gas storage liquid discharge and injection and production pipe string as claimed in any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1A, lowering the production casing (1); S2A, lowering the upper packer (4), the injection and production circulation valve (6), the lower packer (7) and the drainage circulation valve (9) together with the oil pipe (3) into the production casing (1); S3A, close the liquid circulation valve (9), open the injection and production circulation valve (6), and inject gas into the oil pipe (3).

7. A gas storage gas production method, which uses a gas storage liquid discharge and injection and production pipe string as claimed in any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1 B, lowering the production casing (1); S2B, lowering the upper packer (4), the injection and production circulation valve (6), the lower packer (7) and the drainage circulation valve (9) together with the oil pipe (3) into the production casing (1); S3B, close the liquid circulation valve (9), open the injection and production circulation valve (6), and complete the gas production work.

8. A method for draining a gas storage reservoir, using a gas storage reservoir draining and injection and production string as claimed in any one of claims 1 to 5, characterized in that: The method comprises the following steps: S1 C, lowering the production casing (1); S2C, lowering the upper packer (4), the injection and production circulation valve (6), the lower packer (7) and the drainage circulation valve (9) together with the oil pipe (3) into the production casing (1); S3C, open the liquid circulation valve (9), close the injection and production circulation valve (6), and complete the liquid drainage work.

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