Stable gathering and transporting device and system for oil field produced liquid

Abstract

The utility model relates to a stable gathering and transporting device and system for oil field produced liquid, the stable gathering and transporting device for the oil field produced liquid comprises a piston cylinder body, a piston, a one-way valve, a centrifugal machine and a communicating pipe, the side wall of the piston cylinder body is communicated with a produced liquid output port of an oil well Christmas tree through the communicating pipe, and the one-way valve is arranged on the communicating pipe; a liquid outlet is formed in the bottom of the piston cylinder body and communicated with an inlet of the centrifugal machine with the freezing function through a liquid pipeline, the piston is arranged in a cavity of the piston cylinder body and connected with a piston connecting rod, and the piston connecting rod extends out of the upper end of the piston cylinder body and can drive the piston to move up and down to open or plug the liquid outlet. Fluid in the piston cylinder body is pushed to flow to the centrifugal machine. Through the arrangement of the piston cylinder body, the piston, the one-way valve, the centrifugal machine and the communicating pipe, salt crystals in an oil-water mixture of produced liquid can be separated from the oil-water mixture by utilizing the centrifugal machine, the faults of a produced liquid gathering and transportation system caused by blockage of the pipeline by the salt crystals are eliminated, and stable and continuous gathering and transportation of the produced liquid of an oil field are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of oil fields, and particularly relates to a stable gathering and transportation device and system for oilfield produced fluid. Background Technique

[0002] In oil fields, due to the limitations of reservoir characteristics, the concentrations of sodium carbonate and sodium bicarbonate in the produced water contained in the produced fluid are too high, and their concentrations can reach 13% - 25%. The total mineralization degree is 250,000 - 450,000 mg / L. After the produced fluid is lifted from the oil well to the ground, the dissolved salts in the produced water will precipitate due to the change in their existing state, and pipeline blockage caused by salt crystallization will occur in the pipeline, thus seriously affecting oilfield development.

[0003] To solve the above problems, a suitable method is needed to inhibit the crystallization of sodium bicarbonate and sodium carbonate at the wellhead. Generally, the methods for inhibiting crystal crystallization include: 1. Reducing the salt concentration to make it lower than the saturation concentration; 2. Adding a scale inhibitor to prevent the precipitation of salt crystals; 3. Raising the temperature to increase the solubility of the salt. It is difficult to implement the above several methods due to the influence of wellhead salt removal on the technical system. Summary of the Utility Model

[0004] The utility model provides a stable gathering and transportation device and system for oilfield produced fluid to solve one or several of the technical problems existing in the prior art.

[0005] The technical solution of the utility model for solving the above technical problems is as follows: A stable gathering and transportation device for oilfield produced fluid includes a piston cylinder body, a piston, a check valve, a centrifuge, and a connecting pipe. The side wall of the piston cylinder body is connected to the produced fluid output port of the oil well production tree through the connecting pipe, and a check valve is arranged on the connecting pipe; a liquid outlet is arranged at the bottom of the piston cylinder body, and the liquid outlet is connected to the inlet of the centrifuge with a freezing function through a liquid pipeline. The piston is arranged in the cavity of the piston cylinder body and is connected with a piston connecting rod. The piston connecting rod extends out from the upper end of the piston cylinder body and can drive the piston to move up and down to open or block the liquid outlet, and push the fluid in the piston cylinder body to flow towards the centrifuge.

[0006] The beneficial effects of the present utility model are as follows: For the stable gathering and transportation device of oilfield produced fluid of the present utility model, when the pumping unit drives the oil pump disposed in the wellhead Christmas tree of the oil well to move upward, the oil-water mixture at the bottom of the oil well is lifted to the ground. After the water-containing crude oil is produced from the oil well wellhead, the one-way valve established on the connecting pipe between the produced fluid outlet of the wellhead Christmas tree and the piston cylinder body opens, and the produced fluid enters the piston cylinder body through the connecting pipe. The piston in the piston cylinder body moves upward driven by the piston connecting rod, leaving space for the solid-liquid mixture produced from the oil well to smoothly enter the piston cylinder body. When the pumping unit drives the oil pump to move downward (without lifting the oil-water mixture of the oil well), the piston pushes the produced fluid in the piston cylinder body downward under the push of the piston connecting rod and enters the centrifuge. During the process of the piston advancing towards the centrifuge, the one-way valve closes, preventing the oil-water mixture in the piston cylinder body from entering the oil well again through the connecting pipe. The salt crystals in the oil-water mixture can be separated from the oil-water mixture by using the centrifuge, eliminating the influence of salt crystals on the stability of the gathering and transportation of the produced fluid, and realizing the stable and continuous gathering and transportation of the oilfield produced fluid. For the stable gathering and transportation device of oilfield produced fluid of the present utility model, by setting the piston cylinder body, piston, one-way valve, centrifuge and connecting pipe, the salt crystals in the produced fluid can be separated from the oil-water mixture by using the centrifuge, eliminating the faults of the produced fluid gathering and transportation system caused by the blockage of the pipeline by salt crystals, and realizing the stable and continuous gathering and transportation of the oilfield produced fluid.

[0007] On the basis of the above technical solution, the present utility model can also be improved as follows.

[0008] Further, the centrifuge is located directly below the piston cylinder body.

[0009] The beneficial effect of adopting the above further solution is: By setting the centrifuge directly below the piston cylinder body, the oil-water mixture in the piston cylinder body can smoothly enter the centrifuge.

[0010] Further, the outer diameter of the piston is smaller than the inner diameter of the piston cylinder body.

[0011] The beneficial effect of adopting the above further solution is: To avoid the precipitation of salt between the circumferential side of the piston and the piston cylinder body, which affects the normal use of the piston.

[0012] Further, the one-way valve is an interlocking one-way valve.

[0013] Further, the connecting pipe is arranged horizontally or obliquely; when the connecting pipe is arranged obliquely, the end of the connecting pipe connected to the piston cylinder body is lower than the end of the connecting pipe connected to the wellhead Christmas tree of the oil well.

[0014] Further, the connecting pipe is arranged at a position close to the upper end of the piston cylinder body.

[0015] Further, an upper sealing gasket is provided on the upper end face of the piston, and a lower sealing gasket is provided on the lower end face of the piston; the piston connecting rod is hermetically and movably connected to the upper end of the piston cylinder block.

[0016] The beneficial effect of adopting the above further solution is that by providing sealing gaskets on both the upper end face and the lower end face of the piston, it is beneficial to the sealed abutment between the piston and the piston cylinder block.

[0017] Further, the cavity of the piston cylinder block is a circular cavity.

[0018] An oilfield produced fluid stable gathering and transportation system includes the above-mentioned oilfield produced fluid stable gathering and transportation device, and also includes a pumping unit, an oil well Christmas tree, and a sucker rod disposed in the oil well Christmas tree. The sucker rod lifts the fluid in the oil well upward to the connecting pipe under the drive of the pumping unit.

[0019] The beneficial effect of the present utility model is that the oilfield produced fluid stable gathering and transportation system of the present utility model can effectively reduce the influence of salt crystallization in the wellhead produced fluid on the produced fluid gathering and transportation system, and effectively solve the problem of blockage in the treatment and gathering and transportation process of the oil well produced fluid.

[0020] Further, the piston cylinder block is arranged side by side with the oil well Christmas tree, and the inner cavity volume of the piston cylinder block is 1.2 - 1.5 times the rated flow rate of the pumping unit.

[0021] The beneficial effect of adopting the above further solution is that it provides sufficient accommodation space for each fluid lift, avoiding the backflow of the fluid lifted each time. Description of the Drawings

[0022] Figure 1 It is a schematic structural principle diagram of the oilfield produced fluid stable gathering and transportation system of the present utility model.

[0023] In the drawings, the list of components represented by each reference numeral is as follows:

[0024] 1. Piston cylinder block; 11. Liquid pipeline; 2. Piston; 21. Piston connecting rod; 3. Check valve; 4. Centrifuge; 5. Connecting pipe; 6. Sucker rod; 7. Oil well Christmas tree; 8. Pumping unit. Detailed Embodiments

[0025] The principles and features of the present utility model are described below in conjunction with the drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model.

[0026] As Figure 1As shown in the figure, a stable gathering and transportation device for oilfield produced fluid in this embodiment includes a piston cylinder body 1, a piston 2, a check valve 3, a centrifuge 4, and a connecting pipe 5. The side wall of the piston cylinder body 1 is connected to the produced fluid outlet of an oil well Christmas tree 7 through the connecting pipe 5, and a check valve 3 is provided on the connecting pipe 5. A liquid outlet is provided at the bottom of the piston cylinder body 1, and the liquid outlet is connected to the inlet of the centrifuge 4 with a freezing function through a liquid pipeline 11. The piston 2 is arranged in the cavity of the piston cylinder body 1 and is connected with a piston connecting rod 21. The piston connecting rod 21 extends from the upper end of the piston cylinder body 1 and can drive the piston 2 to move up and down to open or block the liquid outlet, pushing the fluid in the piston cylinder body 1 to flow towards the centrifuge 4.

[0027] As Figure 1 shown in the figure, a preferred solution in this embodiment is that the centrifuge 4 is located directly below the piston cylinder body 1. Setting the centrifuge directly below the piston cylinder body can smoothly introduce the oil-water mixture in the piston cylinder body into the centrifuge.

[0028] As Figure 1 shown in the figure, a preferred solution in this embodiment is that the outer diameter of the piston 2 is smaller than the inner diameter of the piston cylinder body 1, to prevent salt from precipitating between the circumference of the piston and the piston cylinder body and affecting the normal use of the piston.

[0029] Preferably, the check valve 3 is an interlocking check valve.

[0030] Optionally, as Figure 1 shown in the figure, the connecting pipe 5 is arranged horizontally or obliquely; when the connecting pipe 5 is arranged obliquely, the end of the connecting pipe 5 connected to the piston cylinder body 1 is lower than the end of the connecting pipe 5 connected to the oil well Christmas tree 7.

[0031] As Figure 1 shown in the figure, specifically, the connecting pipe 5 is arranged at a position near the upper end of the piston cylinder body 1.

[0032] Preferably, an upper sealing gasket is provided on the upper end face of the piston 2 in this embodiment, and a lower sealing gasket is provided on the lower end face of the piston 2. Both the upper sealing gasket and the lower sealing gasket can be made of fluororubber gaskets; the piston connecting rod 21 is hermetically and movably connected to the upper end of the piston cylinder body 1 by a fluororubber sealing ring. By providing sealing gaskets on both the upper end face and the lower end face of the piston, it is beneficial for the piston to be hermetically abutted against the piston cylinder body.

[0033] Specifically, in this embodiment, the piston connecting rod 21 can be connected to an electric drive device composed of a motor and a speed reducer. When the sucker rod is electrically lifted upward by the pumping unit, the piston connecting rod drives the piston to quickly move upward to the uppermost end of the piston cylinder body where it is located, leaving space for the well fluid to enter the cavity of the piston cylinder body. The electric drive device that drives the piston connecting rod performs intermittent motion, that is, it quickly moves upward when the sucker rod is lifted, and quickly moves downward when the sucker rod moves downward, pushing the fluid in the cavity of the piston cylinder body into the centrifuge. The cavity of the piston cylinder body where the piston is located is a circular cavity, and the volume of the circular cavity is related to the model of the pumping unit.

[0034] For the stable gathering and transportation device of the produced fluid in the oilfield of this embodiment, the pumping unit drives the oil pump to move upward to lift the oil-water mixture at the bottom of the well to the ground. After the water-containing crude oil is produced at the wellhead of the oil well, the one-way valve opens, and the produced fluid enters the piston cylinder body through the connecting pipe. The piston in the piston cylinder body moves upward driven by the piston connecting rod, leaving space for the solid-liquid mixture produced from the oil well so that it can smoothly enter the piston cylinder body; when the pumping unit drives the oil pump to move downward (without lifting the oil-water mixture in the oil well), the piston is pushed downward by the piston connecting rod to push the produced fluid from the oil well into the centrifuge. During the process of the piston pushing into the centrifuge, the one-way valve closes to prevent the oil-water mixture in the piston cylinder body from entering the oil well again through the connecting pipe. The centrifuge can be used to separate the salt crystals from the oil-water mixture, eliminating the influence of salt crystals on the stability of the gathering and transportation of the produced fluid, and realizing the stable and continuous gathering and transportation of the produced fluid in the oilfield. For the stable gathering and transportation device of the produced fluid in the oilfield of the present utility model, by setting the piston cylinder body, piston, one-way valve, centrifuge and connecting pipe, the centrifuge can be used to separate the salt crystals from the oil-water mixture, eliminating the faults of the produced fluid gathering and transportation system caused by the blockage of the salt crystals, and realizing the stable and continuous gathering and transportation of the produced fluid in the oilfield.

[0035] As Figure 1 shown, this embodiment also provides a stable gathering and transportation system for the produced fluid in the oilfield, including the above-mentioned stable gathering and transportation device for the produced fluid in the oilfield, and further including a pumping unit 8, an oil well production tree 7, and a sucker rod 6 cooperating with the oil well production tree 7. The sucker rod 6 is arranged in the oil well production tree 7 and under the drive of the pumping unit 8, the fluid in the oil well is lifted upward to the connecting pipe 5.

[0036] As Figure 1 shown, the piston cylinder body 1 is arranged side by side with the oil well production tree 7, and the inner cavity volume of the piston cylinder body 1 is 1.2 - 1.5 times the rated flow rate of the pumping unit 8. This can provide enough accommodation space for each fluid lift and avoid the backflow of the fluid lifted each time.

[0037] The stable gathering and transportation system for the produced fluid in the oilfield of this embodiment can effectively reduce the influence of salt crystals in the wellhead produced fluid on the gathering and transportation system of the produced fluid, and effectively improve the problem of blockage in the process of treating and gathering and transporting the produced fluid from the oil well.

[0038] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "lateral", "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present utility model.

[0039] In the present utility model, unless otherwise clearly specified and defined, terms such as "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0041] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0042] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as a limitation on the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. An oilfield produced fluid stable gathering and transportation device, characterized in that, It includes a piston cylinder block, a piston, a check valve, a centrifuge and a connecting pipe. The side wall of the piston cylinder block is connected to the produced fluid outlet of the wellhead Christmas tree through the connecting pipe, and the check valve is arranged on the connecting pipe. The bottom of the piston cylinder block is provided with a liquid outlet, and the liquid outlet is connected to the inlet of the centrifuge with a freezing function through a liquid pipeline. The piston is arranged in the cavity of the piston cylinder block and is connected with a piston connecting rod. The piston connecting rod extends out from the upper end of the piston cylinder block and can drive the piston to move up and down to open or block the liquid outlet, and push the fluid in the piston cylinder block to flow towards the centrifuge.

2. The oilfield produced fluid stable gathering and transportation device according to claim 1, wherein The centrifuge is located directly below the piston cylinder block.

3. The stable gathering and transportation device for oilfield produced fluid according to claim 1, characterized in that, The outer diameter of the piston is smaller than the inner diameter of the piston cylinder block.

4. The stable gathering and transportation device for oilfield produced fluid according to claim 1, characterized in that, The check valve is an interlocking check valve.

5. The stable gathering and transportation device for oilfield produced fluid according to claim 1, wherein, The connecting pipe is arranged horizontally or obliquely; when the connecting pipe is arranged obliquely, the end of the connecting pipe connected to the piston cylinder block is lower than the end of the connecting pipe connected to the wellhead Christmas tree.

6. The stable gathering and transportation device for oilfield produced fluid according to claim 1, characterized in that, The connecting pipe is arranged at a position near the upper end of the piston cylinder block.

7. The stable gathering and transportation device for oilfield produced fluid according to claim 1, characterized in that, The upper end face of the piston is provided with an upper gasket, and the lower end face of the piston is provided with a lower gasket; the piston connecting rod is hermetically and movably connected to the upper end of the piston cylinder block.

8. The stable gathering and transportation device for oilfield produced fluid according to claim 1, wherein The cavity of the piston cylinder block is a circular cavity.

9. A stable gathering and transportation system for oilfield produced fluids, characterized in that, An oilfield produced fluid stable gathering and transportation device according to any one of claims 1 to 8 further includes a pumping unit, a wellhead Christmas tree and a sucker rod arranged in the wellhead Christmas tree. The sucker rod lifts the fluid in the well upwards to the connecting pipe under the drive of the pumping unit.

10. The stable gathering and transportation system for produced fluids in oil fields according to claim 9, characterized in that, The piston cylinder block is arranged side by side with the wellhead Christmas tree, and the inner cavity volume of the piston cylinder block is 1.2 to 1.5 times the rated flow rate of the pumping unit.

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