In-situ circulation gas lift device

Abstract

The utility model relates to an in-situ circulation gas lift device which comprises a gas transmission mechanism connected with a Christmas tree of an oil well, and an oil pipe and an annular buffer separator which are communicated with the gas transmission mechanism through the Christmas tree respectively. The gas conveying mechanism comprises a first container and a second container which are connected with the Christmas tree and contain driving liquid, and a conveying assembly is arranged between the first container and the second container. The buffer separator is configured to obtain self-produced gas from the produced material within the tubing. Wherein the conveying assembly is configured to enable driving liquid to flow between the first container and the second container, so that self-production gas flows into the first container or the second container, and the self-production gas in the first container or the second container flows to the annulus through the Christmas tree. Therefore, the self-produced gas can be used as a gas source of a gas lift process, so that well bottom stratum pollution or liquid accumulation is effectively relieved, the well bottom flowing pressure is increased, the production pressure difference is enlarged, and normal production of an oil well is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gas lift process, specifically relates to a kind of in-situ circulating gas lift device. BACKGROUND

[0002] Gas lift process is a kind of artificial lifting oil production mode using pipe flow characteristics and gas energy to lift underground oil to the ground.The process injects natural gas, nitrogen, carbon dioxide and other gases from the ground into the wellbore, relies on the high-pressure gas injection to reduce the flow pressure gradient in the tubing string, reduces the density of gas-liquid two-phase flow, maintains oil well production, thereby improving oil well production.This process requires the installation of high-power gas compressor on the ground to continuously supply gas to the downhole to ensure continuous gas lift production.

[0003] However, conventional gas lift process relies on stable high-pressure gas source.Although air is the most widely available gas source, in order to prevent pollution of oil quality and consider construction safety, air is usually avoided as a gas source for gas lift oil production.Therefore, when there is no high-pressure gas source, the application of gas lift process is limited. SUMMARY

[0004] Based on the above problems existing in the prior art, the utility model provides an in-situ circulating gas lift device, which can use self-produced gas generated by the oil well as the gas source for gas lift process, has high safety and obvious yield-increasing effect.

[0005] The utility model discloses a technical scheme adopted to solve the technical problems: providing an in-situ circulating gas lift device, comprising

[0006] A gas delivery mechanism is connected to the Christmas tree of the oil well, the gas delivery mechanism comprises a first container and a second container connected to the Christmas tree and containing driving liquid, and a delivery assembly is arranged between the first container and the second container; and

[0007] A buffer separator is in communication with the tubing and the annulus of the oil well through the Christmas tree respectively, and the buffer separator is configured to obtain self-produced gas from the produced fluid in the tubing,

[0008] Wherein, the delivery assembly is configured to flow the driving liquid between the first container and the second container, so that the self-produced gas flows into the first container or the second container, and the self-produced gas in the first container or the second container flows to the annulus through the Christmas tree.

[0009] Further, the first container and the second container are in communication with the buffer separator through the input manifold, a first valve in communication with the first container and a second valve in communication with the second container are arranged on the input manifold, for allowing only the self-produced gas to flow into the first container or the second container.

[0010] Further, the first container and the second container are connected to the Christmas tree through the output manifold, and the output manifold is provided with a third valve connected to the first container and a fourth valve connected to the second container, so as to allow only the flow of the self-produced gas from the first container or the second container to the Christmas tree.

[0011] Further, the delivery assembly comprises a first liquid level meter and a second liquid level meter arranged on the first container and the second container respectively, for monitoring the liquid level of the driving liquid in the first container and the second container, and the first liquid level meter and the second liquid level meter are electrically connected to the controller.

[0012] Further, the controller is electrically connected to a first delivery pump and a second delivery pump, the first delivery pump is used for delivering the driving liquid from the first container to the second container, and the second delivery pump is used for delivering the driving liquid from the second container to the first container.

[0013] Further, the controller is electrically connected to a bidirectional pump, and the bidirectional pump is used for flowing the driving liquid between the first container and the second container.

[0014] Further, the delivery assembly further comprises a third delivery pump for delivering the driving liquid from the first container to the second container, a fourth delivery pump for delivering the driving liquid from the second container to the first container, and a double-output motor for driving the third delivery pump or the fourth delivery pump.

[0015] Further, two output shafts of the double-output motor are connected to pump shafts of the third delivery pump and the fourth delivery pump through a first clutch and a second clutch respectively, and the first clutch and the second clutch are electrically connected to the controller.

[0016] Further, the driving liquid is water or an alkaline solution.

[0017] Further, a compressor is arranged between the buffer separator and the gas delivery mechanism, and / or between the gas delivery mechanism and the Christmas tree, for pressurizing the self-produced gas.

[0018] The utility model discloses a beneficial effect is: the utility model provides a kind of in situ circulating gas lift device, including the gas transmission mechanism of the Christmas tree of connecting oil well, and with the buffer separator of the oil pipe and annulus of the oil well being communicated respectively by the Christmas tree of the gas transmission mechanism.The gas transmission mechanism includes the first container and second container of connecting the Christmas tree and containing driving liquid, and the first container and the second container between being provided with conveying assembly.The buffer separator is configured to be able to obtain self-gas production from the produced material in oil pipe.Wherein, conveying assembly is configured to be able to make driving liquid flow between the first container and the second container, to make self-gas production flow into the first container or the second container, and the self-gas production in the first container or the second container flows to the annulus by the Christmas tree.In this way, self-gas production can be used as the gas source of gas lift process, to effectively remove bottom hole formation pollution or fluid accumulation, increase bottom hole flow pressure, amplify production differential pressure, realize normal production of oil well. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further described below in connection with the drawings and examples.

[0020] Figure 1 As shown is a kind of structure schematic diagram of in situ circulating gas lift device.

[0021] Figure 2 As shown is Figure 1 As shown is the structure schematic diagram of the gas transmission mechanism of in situ circulating gas lift device in one embodiment.

[0022] Figure 3 As shown is Figure 1 As shown is the structure schematic diagram of the gas transmission mechanism of in situ circulating gas lift device in another embodiment.

[0023] Figure 4 As shown is Figure 1 As shown is the structure schematic diagram of the gas transmission mechanism of in situ circulating gas lift device in another embodiment.

[0024] Wherein, each reference sign in drawing: 100, in situ circulating gas lift device;

[0025] 10, gas transmission mechanism;11, input manifold;111, first valve;112, second valve;12, output manifold;121, third valve;122, fourth valve;13, first container;130, injection pipe;14, second container;15, conveying assembly;151, first liquid level meter;152, second liquid level meter;153, controller;154, first conveying pump;155, second conveying pump;156, bidirectional pump;157, third conveying pump;158, fourth conveying pump;159, communication pipe;16, double-output motor;161, first clutch;162, second clutch;

[0026] 20, buffer separator; 30, gas collection station;

[0027] 200, oil well; 201, casing; 202, tubing; 203, annulus; 204, Christmas tree. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects of the present application more clear, the present application will be described in detail with reference to the drawings. The drawing is a simplified schematic diagram, and only illustrates the basic structure of the present application in a schematic manner, and therefore only shows the components related to the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] Reference Figure 1 As shown in the drawing, the oil well 200 includes the casing 201, the tubing 202 arranged in the casing 201, and the Christmas tree 204 arranged at the wellhead. The annulus 203 is formed between the casing 201 and the tubing 202. The Christmas tree 204 communicates the tubing 202 and the annulus 203. The structure of the Christmas tree 204 is well known to those skilled in the art, and will not be described in detail in the present application.

[0030] The in-situ circulating gas lifting device 100 provided by the present application includes the gas conveying mechanism 10 connected with the Christmas tree 204, the buffer separator 20 connected between the Christmas tree 204 and the gas conveying mechanism 10, and the gas collection station 30 connected with the buffer separator 20. The buffer separator 20 is used to receive the produced fluid obtained from the tubing 202 by the Christmas tree 204, and to preliminarily separate the produced fluid to obtain the self-produced gas conveyed to the gas conveying mechanism 10. The gas conveying mechanism 10 conveys the self-produced gas from the gas production after being pressurized to the annulus 203 through the Christmas tree 204, so that the liquid level in the annulus 203 is lowered and the liquid level of the produced fluid in the tubing 202 is raised. With the continuous production of the oil well 200, the self-produced gas participating in the circulation is more and more, until the total amount of the self-produced gas reaches the self-carrying liquid flow rate of the oil well 200, so that the ability of gas lifting and liquid discharge is formed, thereby realizing the self-circulating gas lifting production of the oil well 200. Thereafter, the buffer separator 20 can convey the excess self-produced gas to the gas collection station 30 for subsequent treatment.

[0031] In some embodiments not shown, a compressor is arranged on the pipeline between the buffer separator 20 and the gas conveying mechanism 10, and is used to pressurize the self-produced gas conveyed to the gas conveying mechanism 10. Preferably, a compressor can also be arranged on the pipeline between the gas conveying mechanism 10 and the Christmas tree 204, and is used to further pressurize the self-produced gas output by the gas conveying mechanism 10, so as to ensure that the pressure of the self-produced gas after entering the annulus 203 can reach the required start-up pressure of the gas lifting process.

[0032] In the subsequent gas lift production process, the pressure of the produced gas after entering the annulus 203 only needs to reach the working pressure required by the gas lift process. Since the starting pressure is greater than the working pressure, the power of the compressor between the buffer separator 20 and the gas transmission mechanism 10, and / or between the gas transmission mechanism 10 and the Christmas tree 204 can be gradually reduced after the normal gas lift production. If the pressurization of the produced gas by the gas transmission mechanism 10 can meet the working pressure, the compressor between the buffer separator 20 and the gas transmission mechanism 10, and between the gas transmission mechanism 10 and the Christmas tree 204 can be directly closed. In this way, the produced gas is pressurized step by step during the transportation of the produced gas to the annulus 203, which makes the gas lift production more flexible and reduces the production cost. Moreover, the in-situ circulating gas lift device 100 uses the produced gas of the oil well 200 as the gas source for the gas lift process, effectively removes the formation pollution or liquid loading at the bottom of the well, increases the bottom hole flowing pressure, amplifies the production pressure difference, realizes the normal production of the oil well 200, and is safer.

[0033] Reference Figures 2-4 As shown in the drawings, in some embodiments, the gas transmission mechanism 10 includes an input manifold 11 connected to the buffer separator 20, an output manifold 12 connected to the Christmas tree 204, and a first container 13 and a second container 14 connected to the input manifold 11 and the output manifold 12 and containing driving liquid. The input manifold 11 is used to transport the produced gas separated by the buffer separator 20 to the first container 13 or the second container 14, and the output manifold 12 is used to transport the produced gas flowing into the first container 13 or the second container 14 to the Christmas tree 204. The first container 13 and the second container 14 are provided with a conveying assembly 15 for flowing the driving liquid between the first container 13 and the second container 14, so as to transport the produced gas flowing into the first container 13 or the second container 14 to the Christmas tree 204 by the driving liquid. The cross-sectional area of the first container 13 and the second container 14 is greater than that of the annulus 203, so that the gas transmission mechanism 10 can pressurize the produced gas during the transportation of the produced gas to the annulus 203 through the Christmas tree 204.

[0034] In some embodiments, the input manifold 11 is provided with a first valve 111 communicating with the first container 13 and a second valve 112 communicating with the second container 14. The first valve 111 and the second valve 112 are both one-way valves, which only allow the produced gas to flow from the buffer separator 20 to the first container 13 or the second container 14. The output manifold 12 is provided with a third valve 121 communicating with the first container 13 and a fourth valve 122 communicating with the second container 14. The third valve 121 and the fourth valve 122 are also one-way valves, which only allow the produced gas to flow from the first container 13 or the second container 14 to the Christmas tree 204.

[0035] The first container 13 and the second container 14 are provided with injection pipes 130 for injecting the driving liquid into the first container 13 and the second container 14. Since the self-gas mainly includes gaseous hydrocarbons such as methane, ethane, etc., sulfides such as hydrogen sulfide, and carbon dioxide and water vapor, the driving liquid can be water. Preferably, the driving liquid is an alkaline solution such as potassium hydroxide solution or sodium hydroxide solution, so as to absorb the hydrogen sulfide and carbon dioxide in the self-gas and prevent the hydrogen sulfide and carbon dioxide from returning to the well bottom under high temperature and high pressure to accelerate the corrosion of the tubing 202 and the casing 201. In this way, as the gas lift oil production proceeds, the concentration of the hydrogen sulfide and carbon dioxide in the well is gradually reduced, effectively avoiding the corrosion and damage of the downhole equipment in the high temperature and high pressure environment, and prolonging the service life of the downhole equipment.

[0036] In combination Figures 2-4 As shown in some embodiments, the delivery assembly 15 includes a first liquid level meter 151 and a second liquid level meter 152 provided on the first container 13 and the second container 14, respectively, for monitoring the liquid level of the driving liquid in the first container 13 and the second container 14. The first liquid level meter 151 and the second liquid level meter 152 are electrically connected to a controller 153 for receiving the signals sent by the first liquid level meter 151 and the second liquid level meter 152.

[0037] With reference to Figure 2 As shown in some embodiments, the delivery assembly 15 further includes a first delivery pump 154 and a second delivery pump 155 electrically connected to the controller 153. The first delivery pump 154 is used to deliver the driving liquid from the first container 13 to the second container 14, and the second delivery pump 155 is used to deliver the driving liquid from the second container 14 to the first container 13.

[0038] In some embodiments, when the liquid level of the driving liquid in the first container 13 drops to the first liquid level meter 151, the controller 153 receives the signal sent by the first liquid level meter 151, and then controls the second delivery pump 155 to deliver the driving liquid from the second container 14 to the first container 13. When the liquid level of the driving liquid in the second container 14 drops to the second liquid level meter 152, the controller 153 receives the signal sent by the second liquid level meter 152, and then controls the first delivery pump 154 to deliver the driving liquid from the first container 13 to the second container 14.

[0039] With reference to Figure 3 As shown in some other embodiments, the delivery assembly 15 includes a bidirectional pump 156 electrically connected to the controller 153. The bidirectional pump 156 can be a plunger pump or a gear pump.

[0040] In some embodiments, when the liquid level of the drive fluid in the first container 13 drops to the first liquid level meter 151, the controller 153 receives the signal sent by the first liquid level meter 151, and then controls the bidirectional pump 156 to deliver the drive fluid from the second container 14 into the first container 13. When the liquid level of the drive fluid in the second container 14 drops to the second liquid level meter 152, the controller 153 receives the signal sent by the second liquid level meter 152, and then controls the bidirectional pump 156 to deliver the drive fluid from the first container 13 into the second container 14.

[0041] Reference Figure 4 As shown in some other embodiments, the delivery assembly 15 includes a third delivery pump 157 connected to the first container 13, a fourth delivery pump 158 connected to the second container 14, and a double-output motor 16 for driving the third delivery pump 157 or the fourth delivery pump 158. The two output shafts of the double-output motor 16 are connected to the pump shafts of the third delivery pump 157 and the fourth delivery pump 158 through a first clutch 161 and a second clutch 162 respectively. The first clutch 161 and the second clutch 162 are electromagnetic clutches, and can be electrically connected to the controller 153. Preferably, the third delivery pump 157 and the fourth delivery pump 158 are connected through a communication pipe 159.

[0042] In some other embodiments, when the liquid level of the drive fluid in the first container 13 drops to the first liquid level meter 151, the controller 153 receives the signal sent by the first liquid level meter 151, and then controls the second clutch 162 to engage one output shaft of the double-output motor 16 with the pump shaft of the fourth delivery pump 158, and controls the first clutch 161 to disengage the other output shaft of the double-output motor 16 from the pump shaft of the third delivery pump 157. At this time, the fourth delivery pump 158 can deliver the drive fluid in the second container 14 into the first container 13 through the communication pipe 159 and the third delivery pump 157.

[0043] When the liquid level of the drive fluid in the second container 14 drops to the second liquid level meter 152, the controller 153 receives the signal sent by the second liquid level meter 152, and then controls the first clutch 161 to engage one output shaft of the double-output motor 16 with the pump shaft of the third delivery pump 157, and controls the second clutch 162 to disengage the other output shaft of the double-output motor 16 from the pump shaft of the fourth delivery pump 158. At this time, the third delivery pump 157 can deliver the drive fluid in the first container 13 into the second container 14 through the communication pipe 159 and the fourth delivery pump 158.

[0044] In combination Figures 1-4 The entire operation process of the in-situ circulating gas lift device 100 will be described in detail below.

[0045] First, the produced fluid in the oil pipe 202 enters the buffer separator 20 through the Christmas tree 204 to carry out preliminary gas-liquid separation to obtain self-produced gas. Then, the first container 13 and the second container 14 are injected and filled with drive fluid through the injection pipe 130. The delivery assembly 15 delivers the drive fluid in the first container 13 into the second container 14, so that the pressure in the first container 13 is reduced. The excess drive fluid in the second container 14 can be discharged through the injection pipe 130 on the second container 14 to maintain the pressure in the second container 14 unchanged. At this time, the self-produced gas separated and obtained by the buffer separator 20 can enter the first container 13 through the first valve 111 until the liquid level of the drive fluid in the first container 13 drops to the first liquid level meter 151.

[0046] After the controller 153 receives the signal sent by the first liquid level meter 151, the delivery assembly 15 delivers the drive fluid in the second container 14 into the first container 13, so that the pressure in the second container 14 is reduced and the pressure in the first container 13 is increased. The self-produced gas separated and obtained by the buffer separator 20 can enter the second container 14 through the second valve 112 until the liquid level of the drive fluid in the second container 14 drops to the second liquid level meter 152. In this process, as the liquid level of the drive fluid in the first container 13 rises, the self-produced gas in the first container 13 enters the annular space 203 through the third valve 121 and the Christmas tree 204, so that the liquid level in the annular space 203 drops and the liquid level in the oil pipe 202 rises.

[0047] After the controller 153 receives the signal sent by the second liquid level meter 152, the delivery assembly 15 delivers the drive fluid in the first container 13 into the second container 14, so that the pressure in the first container 13 is reduced and the pressure in the second container 14 is increased. As the liquid level of the drive fluid in the second container 14 rises, the self-produced gas in the second container 14 enters the annular space 203 through the fourth valve 122 and the Christmas tree 204. In this way, the above process is repeatedly carried out to continuously deliver the self-produced gas into the annular space 203, so as to achieve the purpose of taking the self-produced gas as the gas source of the gas lift process, thereby effectively eliminating the pollution or liquid accumulation of the bottom formation, increasing the bottom hole flowing pressure, amplifying the production pressure difference, and realizing the normal production of the oil well 200.

[0048] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood in a broad sense. For example, it can be fixed connection, can also be detachable connection or integral connection, can be mechanical connection, can be direct connection or indirect connection through intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0049] It should be understood that the terms "length", "width", "upper", "lower", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0050] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application, and equivalent components can be substituted therefor. In particular, the technical features mentioned in each of the embodiments can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A device for in situ cyclic gas lift, characterized by Comprising a gas transfer mechanism (10) connected to a Christmas tree (204) of an oil well (200), the gas transfer mechanism (10) comprising a first container (13) and a second container (14) connected to the Christmas tree (204) and filled with a driving fluid, a delivery assembly (15) arranged between the first container (13) and the second container (14); and a buffer separator (20) in communication with the gas transfer mechanism (10) through a tubing (202) and an annulus (203) of the oil well (200) respectively via the Christmas tree (204), the buffer separator (20) configured to obtain self-gas from produced fluid in the tubing (202), wherein the delivery assembly (15) is configured to flow the driving fluid between the first container (13) and the second container (14) so as to flow the self-gas into the first container (13) or the second container (14), and the self-gas in the first container (13) or the second container (14) flows to the annulus (203) through the Christmas tree (204).

2. The in situ cyclic gas lift device of claim 1, wherein, the first container (13) and the second container (14) are in communication with the buffer separator (20) through an input manifold (11) provided with a first valve (111) in communication with the first container (13) and a second valve (112) in communication with the second container (14) for allowing the self-gas to flow into the first container (13) or the second container (14) only.

3. The in situ cyclic gas lift device of claim 2, wherein, the first container (13) and the second container (14) are in communication with the Christmas tree (204) through an output manifold (12) provided with a third valve (121) in communication with the first container (13) and a fourth valve (122) in communication with the second container (14) for allowing the self-gas to flow from the first container (13) or the second container (14) to the Christmas tree (204) only.

4. The in situ recycle gas lift device of any one of claims 1-3, wherein, the delivery assembly (15) comprises a first liquid level meter (151) and a second liquid level meter (152) arranged on the first container (13) and the second container (14) respectively for monitoring liquid levels of the driving fluid in the first container (13) and the second container (14), the first liquid level meter (151) and the second liquid level meter (152) are electrically connected to a controller (153).

5. The in situ cyclic gas lift device of claim 4, wherein, the controller (153) is electrically connected to a first delivery pump (154) and a second delivery pump (155), the first delivery pump (154) is used to deliver the driving fluid from the first container (13) to the second container (14), the second delivery pump (155) is used to deliver the driving fluid from the second container (14) to the first container (13).

6. The in situ cyclic gas lift device of claim 4, wherein, the controller (153) is electrically connected to a bidirectional pump (156), the bidirectional pump (156) is used to flow the driving fluid between the first container (13) and the second container (14).

7. The in situ recycle gas lift device of claim 4, wherein, The conveying assembly (15) comprises a third conveying pump (157) for conveying the driving liquid from the first container (13) to the second container (14), a fourth conveying pump (158) for conveying the driving liquid from the second container (14) to the first container (13), and a double-output motor (16) for driving the third conveying pump (157) or the fourth conveying pump (158).

8. The in situ cyclic gas lift device of claim 7, wherein, The two output shafts of the double-output motor (16) are connected to the pump shafts of the third conveying pump (157) and the fourth conveying pump (158) through a first clutch (161) and a second clutch (162) respectively, and the first clutch (161) and the second clutch (162) are electrically connected to the controller (153).

9. The in situ recycle gas lift device of any one of claims 1-3, wherein, The driving liquid is water or an alkaline solution.

10. The in situ gas lift recirculation device of any one of claims 1-3, wherein, A compressor is arranged between the buffer separator (20) and the gas conveying mechanism (10), and / or between the gas conveying mechanism (10) and the Christmas tree (204) for pressurizing the self-produced gas.

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