Simple wellhead device for layered water injection

Abstract

The utility model relates to the technical field of separated layer water injection, in particular to a simple wellhead device for separated layer water injection, which comprises a casing pipe large four-way joint, a casing pipe main body, a casing pipe assembly, an outer pipe four-way joint, an outer pipe main body, an outer pipe assembly, an inner pipe main body, an inner pipe assembly and a water inlet pipe. A casing pipe body is arranged below a casing pipe large four-way joint, a casing pipe assembly is arranged on one side of the casing pipe large four-way joint, an outer pipe four-way joint is arranged at the top end of the casing pipe large four-way joint, an outer pipe body is arranged on the inner side of the outer pipe four-way joint, an outer pipe assembly is arranged on one side of the outer pipe four-way joint, and an inner pipe body is arranged on the inner side of the outer pipe body. An inner pipe assembly is arranged on one side of the inner pipe body, a water inlet pipe is arranged on the outer side of the outer pipe four-way joint, and the length of the inner pipe body is larger than that of the outer pipe body. By means of the concentric double-pipe layered water injection mode, water injection can be conducted on more than two layers under the condition that a pipe column is not moved, water injection efficiency is greatly improved, use cost is effectively saved, and therefore the practical value of the device is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of separate layer water injection, in particular to a simple wellhead device for separate layer water injection. Background Art

[0002] In recent years, with the continuous in-depth development of water injection in multi-layer oilfields, the water injection effect has been continuously manifested. It drives oil by injecting water into the oil layer, thereby increasing the fluidity and production of crude oil, and can effectively improve the recovery rate of the oil reservoir.

[0003] The existing ordinary injection wellhead can only achieve single-layer water injection. If it is necessary to inject water into different layers, only moving the pipe string operation can be carried out, and pressure-bearing operation may be required. Adjusting the water injection layer is time-consuming and laborious, resulting in an increase in water injection cost and poor flexibility in use.

[0004] Therefore, aiming at the situation that most of the existing simple wellhead devices can only achieve single-layer water injection and the difficulty of separate layer water injection is relatively large, a simple wellhead device for separate layer water injection can be designed. By means of concentric double-pipe separate layer water injection, water injection into two or more layers can be carried out without moving the pipe string, greatly improving the water injection efficiency, effectively saving the use cost, and thus enhancing the practical value of the device. Content of the Utility Model

[0005] In order to overcome the problem that most ordinary injection wellheads can only achieve single-layer water injection. If it is necessary to inject water into different layers, only moving the pipe string operation can be carried out. Adjusting the water injection layer is time-consuming and laborious, resulting in an increase in water injection cost and poor flexibility in use.

[0006] The technical solution of the utility model is: a simple wellhead device for separate layer water injection, which includes a casing four-way, a casing main body, a casing assembly, an outer pipe four-way, an outer pipe main body, an outer pipe assembly, an inner pipe main body, an inner pipe assembly and a water inlet pipe; the casing four-way is arranged below the casing main body, the casing assembly is arranged on one side of the casing four-way, the outer pipe four-way is arranged at the top of the casing four-way, the outer pipe main body is arranged inside the outer pipe four-way, the outer pipe assembly is arranged on one side of the outer pipe four-way, the inner pipe main body is arranged inside the outer pipe main body, the inner pipe assembly is arranged on one side of the inner pipe main body, the water inlet pipe is arranged outside the outer pipe four-way, the water inlet pipe is mutually communicated with the casing main body, the water inlet pipe is also mutually communicated with the outer pipe main body, and the water inlet pipe is also mutually communicated with the inner pipe main body. Among them, the length of the inner pipe main body is longer than that of the outer pipe main body.

[0007] Preferably, by setting the casing assembly to control the liquid flow state in the casing body, the solution in the water inlet pipe is injected into the casing body through the large four-way casing. At the same time, the outer pipe body is protected by the casing body. By setting the outer pipe assembly to control the liquid flow state in the outer pipe body, the solution in the water inlet pipe is injected into the outer pipe body through the four-way outer pipe. The solution is injected into the underground layer at a certain depth through the outer pipe body. By setting the inner pipe assembly to control the liquid flow state in the inner pipe body, the solution in the water inlet pipe is injected into the inner pipe body through the four-way outer pipe. The solution is injected into the underground layer at another depth through the inner pipe body. Thus, water injection can be carried out on two or more layers without moving the pipe string, greatly improving the water injection efficiency, effectively saving the use cost, and enhancing the practical value of the device.

[0008] Preferably, the casing assembly includes a casing flange, a casing gate valve, a casing drain gate valve, and a casing pressure gauge; the bottom surface of the large four-way casing is provided with a casing flange, one side of the large four-way casing is provided with a casing gate valve, the other side of the large four-way casing is provided with a casing drain gate valve, and one end of the large four-way casing is provided with a casing pressure gauge; the position of the large four-way casing is fixed through the casing flange, the opening and closing of the liquid inlet of the large four-way casing is adjusted by rotating the casing gate valve. In the non-working state or emergency of the device, the casing drain gate valve is opened to discharge the pressurized gas or liquid to avoid accidents, and the casing pressure gauge is used to observe the internal hydraulic and gas pressure conditions of the casing body.

[0009] Preferably, the bottom surface of the casing flange is provided with a casing body, the casing body extends underground, and the casing pressure gauge and the casing drain gate valve are on the same side; the position of the casing body is fixed through the casing flange, and the casing pressure gauge is used to monitor the internal pressure change of the casing body in real time to ensure the safe use of the device.

[0010] Preferably, the outer pipe assembly includes an outer pipe flange, an outer pipe gate valve, an outer pipe flowmeter, and a first oil hanging pipe; the top of the four-way outer pipe is provided with an outer pipe flange, one side of the four-way outer pipe is provided with an outer pipe gate valve, the other side of the four-way outer pipe is provided with an outer pipe flowmeter, the inner side of the four-way outer pipe is provided with a first oil hanging pipe, and the inner side of the first oil hanging pipe is provided with an outer pipe body; the position of the four-way outer pipe is fixed through the outer pipe flange, the opening and closing of the liquid inlet of the four-way outer pipe is adjusted by rotating the outer pipe gate valve, the flow of the outer pipe body is monitored in real time through the outer pipe flowmeter, and the position of the outer pipe body is fixed by using the first oil hanging pipe.

[0011] Preferably, the outer pipe flowmeter is on the other side of the outer pipe gate valve, and the first oil hanging pipe is arranged at the bottom of the inner side of the four-way outer pipe; the outer pipe body is fixed at the bottom of the four-way outer pipe through the first oil hanging pipe, and the amount of liquid injected into the outer pipe body is monitored in real time through the outer pipe flowmeter, so as to achieve the effect of accurately regulating the water injection volume.

[0012] Preferably, the inner pipe assembly includes an inner pipe gate valve, an inner pipe flowmeter, a second oil hanging pipe, a reducing connecting pipe, an internal thread and an external thread; an inner pipe gate valve is arranged above the outer pipe flange, an inner pipe flowmeter is arranged above the inner pipe gate valve, a second oil hanging pipe is arranged at the top inside the outer pipe four-way, a reducing connecting pipe is arranged inside the second oil hanging pipe, an internal thread is opened on the inner side of one end of the reducing connecting pipe, and an external thread is opened on the outer side of the other end of the reducing connecting pipe; the opening and closing state of the liquid inlet at the top of the outer pipe four-way is adjusted by rotating the inner pipe gate valve, the flow of the inner pipe main body is monitored in real time by using the inner pipe flowmeter, the diameter of the inner pipe main body is changed through the reducing connecting pipe, the second oil hanging pipe is connected by thread using the internal thread, and the inner pipe main body is fixedly connected through the external thread.

[0013] Preferably, the inner side of the reducing connecting pipe is threadedly connected to the outer side of the second oil hanging pipe, the bottom of the reducing connecting pipe is provided with an inner pipe main body, and the inner side of one end of the inner pipe main body is threadedly connected to the outer side of the reducing connecting pipe; the reducing connecting pipe is rotated along the internal thread to fix the reducing connecting pipe to the outer side of the second oil hanging pipe, and the inner pipe main body is rotated along the external thread to fix the inner pipe main body to the bottom end of the reducing connecting pipe.

[0014] The beneficial effects of the present utility model are as follows:

[0015] 1. Compared with the traditional water injection wellhead that can only achieve single-layer water injection, most water injection operations are carried out using a single pipe string. If water injection is required at different layers, only moving pipe string operations can be performed, and pressure-bearing operations may be required, which is time-consuming and laborious when adjusting the water injection layer, resulting in an increase in water injection costs. By means of concentric double-pipe stratified water injection, water injection can be carried out on two or more layers without moving the pipe string, greatly improving the water injection efficiency, effectively saving the usage cost, and thus enhancing the practical value of the device;

[0016] 2. During the water injection operation, the solution at the water inlet pipe is injected into the casing main body through the casing four-way to carry out a water injection operation for one depth of the underground layer. The solution at the water inlet pipe is injected into the outer pipe main body by using the outer pipe four-way. At the same time, the solution can also enter the inner pipe main body through the outer pipe four-way, and water injection is carried out on another depth of the underground layer through the outer pipe main body, and water injection is carried out on a deeper underground layer by using the inner pipe main body, so as to solve the problem that most simple wellhead devices can only achieve single-layer water injection and it is difficult to carry out stratified water injection, and enhance the flexibility of the device in use;

[0017] 3. When installing the inner pipe main body, it is fixed to the casing main body through the casing flange, the outer pipe four-way is fixed to the outer pipe main body by using the outer pipe flange, the outer pipe main body is fixedly connected through the first oil hanging pipe, the reducing connecting pipe is rotated along the internal thread to fix the reducing connecting pipe to the outer side of the second oil hanging pipe, and the inner pipe main body is rotated along the external thread to fix the inner pipe main body to the bottom end of the reducing connecting pipe. Brief Description of the Drawings

[0018] Figure 1The figure shows a three-dimensional structural schematic diagram of a simple wellhead device for separate layer water injection of the present utility model;

[0019] Figure 2 The figure shows a three-dimensional structural schematic diagram of a casing assembly of a simple wellhead device for separate layer water injection of the present utility model;

[0020] Figure 3 The figure shows a three-dimensional structural schematic diagram of an outer pipe assembly of a simple wellhead device for separate layer water injection of the present utility model;

[0021] Figure 4 The figure shows a three-dimensional sectional structural schematic diagram of an outer pipe cross of a simple wellhead device for separate layer water injection of the present utility model;

[0022] Figure 5 The figure shows a three-dimensional structural schematic diagram of a reduced-diameter connecting pipe of a simple wellhead device for separate layer water injection of the present utility model.

[0023] Explanation of reference numerals: 1, casing cross; 101, casing body; 102, casing flange; 103, casing gate valve; 104, casing drain valve; 105, casing pressure gauge; 2, outer pipe cross; 201, outer pipe body; 202, outer pipe flange; 203, outer pipe gate valve; 204, outer pipe flowmeter; 205, first oil hanging pipe; 3, inner pipe body; 301, inner pipe gate valve; 302, inner pipe flowmeter; 303, second oil hanging pipe; 304, reduced-diameter connecting pipe; 305, internal thread; 306, external thread; 4, water inlet pipe. Detailed implementation manners

[0024] The present utility model will be further described below with reference to the drawings and embodiments.

[0025] Please refer to Figures 1 - 5 , the present utility model provides an embodiment: a simple wellhead device for separate layer water injection, including a casing cross 1, a casing body 101, a casing assembly, an outer pipe cross 2, an outer pipe body 201, an outer pipe assembly, an inner pipe body 3, an inner pipe assembly and a water inlet pipe 4; the casing body 101 is arranged below the casing cross 1, the casing assembly is arranged on one side of the casing cross 1, the outer pipe cross 2 is arranged at the top of the casing cross 1, the outer pipe body 201 is arranged inside the outer pipe cross 2, the outer pipe assembly is arranged on one side of the outer pipe cross 2, the inner pipe body 3 is arranged inside the outer pipe body 201, the inner pipe assembly is arranged on one side of the inner pipe body 3, the water inlet pipe 4 is arranged outside the outer pipe cross 2, the water inlet pipe 4 communicates with the casing body 101, the water inlet pipe 4 also communicates with the outer pipe body 201, and the water inlet pipe 4 further communicates with the inner pipe body 3, wherein, the length of the inner pipe body 3 is longer than that of the outer pipe body 201.

[0026] Please refer to Figure 2, in this embodiment, the casing assembly includes a casing flange 102, a casing gate valve 103, a casing drain gate valve 104, and a casing pressure gauge 105; a casing flange 102 is provided on the bottom surface of the large casing cross joint 1, a casing gate valve 103 is provided on one side of the large casing cross joint 1, a casing drain gate valve 104 is provided on the other side of the large casing cross joint 1, and a casing pressure gauge 105 is provided at one end of the large casing cross joint 1. The position of the large casing cross joint 1 is fixed through the casing flange 102. The casing gate valve 103 is rotated to adjust the opening and closing of the liquid inlet of the large casing cross joint 1. In the non-operating state or in an emergency of the device, the casing drain gate valve 104 is opened to discharge the pressurized gas or liquid to avoid accidents. The casing pressure gauge 105 is used to observe the hydraulic and gas pressure conditions inside the casing body 101; a casing body 101 is provided on the bottom surface of the casing flange 102, and the casing body 101 extends underground. The casing pressure gauge 105 and the casing drain gate valve 104 are on the same side. The position of the casing body 101 is fixed through the casing flange 102, and the casing pressure gauge 105 is used to monitor the change of the internal pressure of the casing body 101 in real time to ensure the safe use of the device.

[0027] Please refer to Figures 3 - 5 , in this embodiment, the outer pipe assembly includes an outer pipe flange 202, an outer pipe gate valve 203, an outer pipe flowmeter 204, and a first oil hanging pipe 205; an outer pipe flange 202 is provided at the top of the outer pipe cross joint 2, an outer pipe gate valve 203 is provided on one side of the outer pipe cross joint 2, an outer pipe flowmeter 204 is provided on the other side of the outer pipe cross joint 2, and a first oil hanging pipe 205 is provided inside the outer pipe cross joint 2. An outer pipe body 201 is provided inside the first oil hanging pipe 205. The position of the outer pipe cross joint 2 is fixed through the outer pipe flange 202. The outer pipe gate valve 203 is rotated to adjust the opening and closing of the liquid inlet of the outer pipe cross joint 2. The flow of the outer pipe body 201 is monitored in real time through the outer pipe flowmeter 204, and the position of the outer pipe body 201 is fixed by using the first oil hanging pipe 205; the outer pipe flowmeter 204 is on the other side of the outer pipe gate valve 203, and the first oil hanging pipe 205 is arranged at the bottom inside the outer pipe cross joint 2. The outer pipe body 201 is fixed to the bottom of the outer pipe cross joint 2 through the first oil hanging pipe 205, and the amount of liquid injected into the outer pipe body 201 is monitored in real time by using the outer pipe flowmeter 204, so as to achieve the effect of accurately regulating the water injection volume;

[0028] The inner pipe assembly includes an inner pipe gate valve 301, an inner pipe flowmeter 302, a second oil hanging pipe 303, a reducing connecting pipe 304, an internal thread 305 and an external thread 306; an inner pipe gate valve 301 is arranged above the outer pipe flange 202, an inner pipe flowmeter 302 is arranged above the inner pipe gate valve 301, a second oil hanging pipe 303 is arranged at the top inside the outer pipe four-way 2, a reducing connecting pipe 304 is arranged inside the second oil hanging pipe 303, an internal thread 305 is opened on the inner side of one end of the reducing connecting pipe 304, and an external thread 306 is opened on the outer side of the other end of the reducing connecting pipe 304. Rotate the inner pipe gate valve 301 to adjust the opening and closing state of the liquid inlet at the top of the outer pipe four-way 2, use the inner pipe flowmeter 302 to monitor the flow rate of the inner pipe main body 3 in real time, realize the diameter change of the inner pipe main body 3 through the reducing connecting pipe 304, connect the second oil hanging pipe 303 by threading with the internal thread 305, and fixedly connect the inner pipe main body 3 through the external thread 306; the inner side of the reducing connecting pipe 304 is threadedly connected to the outer side of the second oil hanging pipe 303, the inner pipe main body 3 is arranged at the bottom of the reducing connecting pipe 304, the inner side of one end of the inner pipe main body 3 is threadedly connected to the outer side of the reducing connecting pipe 304, rotate the reducing connecting pipe 304 along the internal thread 305 to fix the reducing connecting pipe 304 to the outer side of the second oil hanging pipe 303, and rotate the inner pipe main body 3 along the external thread 306 to fix the inner pipe main body 3 to the bottom end of the reducing connecting pipe 304.

[0029] When installing the inner pipe main body 3, fix the casing large four-way 1 to the casing main body 101 through the casing flange 102, fix the outer pipe four-way 2 to the outer pipe main body 201 by using the outer pipe flange 202, fixedly connect the outer pipe main body 201 through the first oil hanging pipe 205, rotate the reducing connecting pipe 304 along the internal thread 305 to fix the reducing connecting pipe 304 to the outer side of the second oil hanging pipe 303, and rotate the inner pipe main body 3 along the external thread 306 to fix the inner pipe main body 3 to the bottom end of the reducing connecting pipe 304;

[0030] In the non-operation state, rotate the casing drain gate valve 104 to open the channel of the casing main body 101, discharge the pressurized gas or liquid to avoid accidents, and use the casing pressure gauge 105 to observe the internal hydraulic pressure and air pressure conditions of the casing main body 101;

[0031] During the water injection operation, rotate the casing gate valve 103 to inject the solution at the water inlet pipe 4 into the casing main body 101 for a certain depth of underground layer water injection operation;

[0032] During the stratified water injection, rotate the outer pipe gate valve 203 to open the liquid inlet of the outer pipe four-way 2, inject the solution at the water inlet pipe 4 into the outer pipe main body 201, and monitor and control the flow rate in real time through the outer pipe flowmeter 204, and inject water into another depth of the underground layer through the outer pipe main body 201;

[0033] In addition, the inner pipe gate valve 301 can be rotated to open the liquid inlet at the top of the outer pipe four-way joint 2, and the solution at the water inlet pipe 4 is injected into the inner pipe main body 3. The flow rate is monitored and regulated in real time by the inner pipe flowmeter 302, and the inner pipe main body 3 is used to inject water into a deeper underground layer.

[0034] Through the above steps, by setting the casing assembly to control the liquid flow state in the casing main body 101, the solution in the water inlet pipe 4 is injected into the casing main body 101 through the casing four-way joint 1. At the same time, the outer pipe main body 201 is protected by the casing main body 101. By setting the outer pipe assembly to control the liquid flow state in the outer pipe main body 201, the solution in the water inlet pipe 4 is injected into the outer pipe main body 201 through the outer pipe four-way joint 2, and the solution is injected into a certain depth of the underground layer through the outer pipe main body 201. By setting the inner pipe assembly to control the liquid flow state in the inner pipe main body 3, the solution in the water inlet pipe 4 is injected into the inner pipe main body 3 through the outer pipe four-way joint 2, and the solution is injected into another depth of the underground layer through the inner pipe main body 3.

[0035] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by those skilled in the art.

Claims

1. A simple wellhead device for separate layer water injection, comprising a casing four-way joint (1); characterized in that: It further includes a casing body (101), a casing assembly, an outer pipe cross (2), an outer pipe body (201), an outer pipe assembly, an inner pipe body (3), an inner pipe assembly, and a water inlet pipe (4); the casing cross (1) is provided with the casing body (101) below it, the casing assembly is provided on one side of the casing cross (1), the outer pipe cross (2) is provided at the top of the casing cross (1), the outer pipe body (201) is provided inside the outer pipe cross (2), the outer pipe assembly is provided on one side of the outer pipe cross (2), the inner pipe body (3) is provided inside the outer pipe body (201), the inner pipe assembly is provided on one side of the inner pipe body (3), the water inlet pipe (4) is provided outside the outer pipe cross (2), the water inlet pipe (4) communicates with the casing body (101), the water inlet pipe (4) also communicates with the outer pipe body (201), and the water inlet pipe (4) further communicates with the inner pipe body (3), where, the inner pipe body (3) is longer than the outer pipe body (201), and the casing assembly includes a casing flange (102), a casing gate valve (103), a casing drain gate valve (104), and a casing pressure gauge (105); the casing flange (102) is provided on the bottom surface of the casing cross (1), the casing gate valve (103) is provided on one side of the casing cross (1), the casing drain gate valve (104) is provided on the other side of the casing cross (1), the casing pressure gauge (105) is provided at one end of the casing cross (1), the outer pipe assembly includes an outer pipe flange (202), an outer pipe gate valve (203), an outer pipe flowmeter (204), and a first oil hanging pipe (205); the outer pipe flange (202) is provided at the top of the outer pipe cross (2), the outer pipe gate valve (203) is provided on one side of the outer pipe cross (2), the outer pipe flowmeter (204) is provided on the other side of the outer pipe cross (2), the first oil hanging pipe (205) is provided inside the outer pipe cross (2), the outer pipe body (201) is provided inside the first oil hanging pipe (205), the inner pipe assembly includes an inner pipe gate valve (301), an inner pipe flowmeter (302), a second oil hanging pipe (303), a reducing connecting pipe (304), an internal thread (305), and an external thread (306); the inner pipe gate valve (301) is provided above the outer pipe flange (202), the inner pipe flowmeter (302) is provided above the inner pipe gate valve (301), the second oil hanging pipe (303) is provided at the top inside the outer pipe cross (2), the reducing connecting pipe (304) is provided inside the second oil hanging pipe (303), an internal thread (305) is provided inside one end of the reducing connecting pipe (304), and an external thread (306) is provided outside the other end of the reducing connecting pipe (304).

2. The simple wellhead device for separate layer water injection according to claim 1, characterized in that: The casing flange (102) is provided with the casing body (101) on its bottom surface, the casing body (101) extends underground, and the casing pressure gauge (105) is on the same side as the casing drain gate valve (104).

3. The simple wellhead device for separate layer water injection according to claim 2, characterized in that: The outer pipe flowmeter (204) is on the other side of the outer pipe gate valve (203), and the first oil hanging pipe (205) is provided at the bottom inside the outer pipe cross (2).

4. The simple wellhead device for separate layer water injection according to claim 3, characterized in that: The inner side of the reducing connecting pipe (304) is threadedly connected to the outer side of the second oil hanging pipe (303). An inner pipe main body (3) is provided at the bottom of the reducing connecting pipe (304), and the inner side of one end of the inner pipe main body (3) is threadedly connected to the outer side of the reducing connecting pipe (304).

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