Automatic liquid supplementing oil-gas mixed transportation device and using method

Abstract

The invention belongs to the technical field of oil field ground gathering and transportation, and particularly relates to an automatic liquid supplementing oil-gas mixed transportation device and a using method. An automatic liquid supplementing oil-gas mixed transportation device comprises a support, a screw pump, a liquid outlet pipe, a liquid supplementing tank and a liquid inlet pipe. The input end of the screw pump is connected with a liquid inlet pipe, the output end of the screw pump is connected with a liquid outlet pipe, a liquid supplementing tank is connected between the liquid outlet pipe and the liquid inlet pipe through a pipeline, a liquid supplementing backflow pipe is arranged on the upper portion of the liquid supplementing tank and connected with the liquid outlet pipe, and a liquid supplementing pipe is arranged at the bottom of the liquid supplementing tank and connected with the liquid inlet pipe. And a pressure gauge and a temperature transmitter are sequentially arranged on a pipeline, close to one end of the screw pump, at the joint of the liquid outlet pipe and the liquid supplementing return pipe. Fluid self-circulation is achieved through the pressure difference of an inlet and an outlet of the pump, the purpose of supplementing liquid and cooling the screw pump is achieved, use of external liquid supplementing pump equipment is reduced, and liquid and gas products of an oil field can be efficiently, safely and continuously conveyed.

Description

Technical Field

[0001] The present invention belongs to the technical field of oilfield surface gathering and transportation, and particularly relates to an automatic liquid supplementing oil-gas mixed transportation device and a using method thereof. Background Art

[0002] At present, in most oilfields in the oil-gas mixed transportation system, screw pumps are used for boosting and transporting oil-gas mixed transportation. However, during the oil and gas production process, the liquid inflow and gas volume fluctuate greatly. Sometimes the gas volume is very large and the liquid volume is very small, sometimes the liquid volume is very large and the gas volume is very small, and sometimes even slug flow occurs. In the transportation of oil and gas with a medium to high oil-gas ratio, in order to prevent the dry grinding of the rotating parts of the pump body caused by gas slugs, a liquid supplementing device is usually set at the pump inlet to cool the pressurizing components of the pump body by adding water.

[0003] In the prior art, the automatic liquid supplementing device is realized by setting a liquid supplementing pump to add water to the inlet of the oil-gas mixed transportation pump. The inventor found that there are at least the following problems in the prior art: 1) The existing automatic liquid supplementing device requires additional construction of a water tank and a booster pump, resulting in high construction investment; 2) The amount of supplemented water increases with the increase of the oil-gas ratio. On the one hand, it increases the load of the pipeline system, and on the other hand, it increases the energy consumption of the liquid supplementing system; 3) The liquid supplementing device needs to regularly supplement the consumed water volume, which is very inconvenient and has a high operating cost. Summary of the Invention

[0004] Aiming at the above problems, the purpose of the present invention is to provide an automatic liquid supplementing oil-gas mixed transportation device and a using method thereof. The device realizes the self-circulation of the fluid through the pressure difference between the pump inlet and outlet, achieves the purpose of supplementing liquid and cooling the screw pump, does not require external systems to supplement liquid, reduces the use of external liquid supplementing pump equipment, and can efficiently, safely and continuously transport the liquid and gas products of the oilfield, thereby greatly simplifying the production process, improving the production efficiency, and reducing the production cost.

[0005] The technical solution of the present invention is as follows: An automatic liquid supplementing oil-gas mixed transportation device includes a support, a screw pump, a liquid outlet pipe, a liquid supplementing tank, and a liquid inlet pipe; the screw pump is fixedly installed on the upper surface of the support, the input end of the screw pump is connected to the liquid inlet pipe, the output end of the screw pump is connected to the liquid outlet pipe, the liquid outlet pipe and the liquid inlet pipe are connected by a pipeline with the liquid supplementing tank, the upper part of the liquid supplementing tank is provided with a liquid supplementing return pipe, the liquid supplementing return pipe is connected to the liquid outlet pipe, the bottom of the liquid supplementing tank is provided with a liquid supplementing pipe, the liquid supplementing pipe is connected to the liquid inlet pipe, a drain manual valve is provided on the pipeline of the liquid outlet pipe at the end far from the screw pump where it is connected to the liquid supplementing return pipe, a pressure gauge and a temperature transmitter are sequentially provided on the pipeline of the liquid outlet pipe at the end close to the screw pump where it is connected to the liquid supplementing return pipe, an inlet liquid manual valve is provided on the pipeline of the liquid supplementing pipe at the end close to the screw pump where it is connected to the liquid inlet pipe, and a liquid supplementing manual valve is provided on the liquid supplementing pipe.

[0006] A cooling conduit is also provided between the liquid replenishing tank and the liquid inlet pipe. One end of the cooling conduit is connected to the pipeline between the liquid replenishing manual valve and the liquid replenishing tank, and the other end is connected to the pipeline between the filter and the screw pump. A control valve is provided on the cooling conduit.

[0007] There are two liquid replenishing return pipes. One is located at the top of the liquid replenishing tank, and the other is located on the upper side of the liquid replenishing tank. There are two temperature transmitters. One is located on the liquid outlet pipe at the output end of the screw pump, and the other is located on the pipeline between the two liquid replenishing return pipes and the connection of the liquid outlet pipe.

[0008] The liquid outlet pipe is in a "Z" - shaped structure. The section close to the screw pump and the section connected to the top of the liquid replenishing tank are respectively horizontally arranged.

[0009] The liquid inlet pipe is in a "Z" - shaped structure. The section close to the screw pump is horizontally arranged, and the section adjacent to the liquid replenishing pipe is vertically arranged.

[0010] A check valve is provided on the pipeline between the connection of the liquid outlet pipe and the liquid replenishing return pipe and the liquid discharge manual valve.

[0011] A filter is provided on the pipeline between the connection of the liquid replenishing pipe and the liquid inlet pipe and the liquid inlet manual valve.

[0012] A usage method of an automatic liquid - replenishing oil - gas mixed transportation device. Using the above - mentioned automatic liquid - replenishing oil - gas mixed transportation device, it includes the following steps: S1: First, open the liquid replenishing manual valve. At this time, due to the self - pressure inside the liquid inlet pipe, the liquid inside the liquid inlet pipe enters the liquid replenishing tank for storage. After the liquid replenishing tank is filled, manually close the liquid replenishing manual valve. S2: Connect the screw pump to the power supply, and sequentially open the liquid inlet manual valve and the liquid discharge manual valve. At this time, the oil - gas inside the liquid inlet pipe enters the liquid outlet pipe under the action of the screw pump. The temperature transmitter is used to detect the temperature of the oil - gas inside the liquid outlet pipe. When the temperature exceeds the set value and the control valve opens, the liquid inside the liquid replenishing tank flows into the screw pump through the cooling conduit and the liquid inlet pipe, so that the liquid cools the screw pump. Due to the pressure difference between the liquid inlet pipe and the liquid outlet pipe, a small part of the oil - gas inside the liquid outlet pipe enters the liquid replenishing tank through the liquid replenishing return pipe for replenishment, and most of the oil - gas is discharged through the liquid discharge manual valve.

[0013] The technical effects of the present invention are as follows: 1. The present invention is provided with a liquid replenishing tank installed between the liquid outlet pipe and the liquid inlet pipe, and a temperature transmitter is installed on the liquid outlet pipe, which is convenient for the temperature transmitter to monitor the temperature of the oil-gas mixture inside the liquid outlet pipe. Furthermore, when the temperature of the oil-gas mixture output by the screw pump is too high, the control valve is opened, so that the liquid inside the liquid replenishing tank enters the screw pump through the cooling conduit and the liquid inlet pipe, achieving the purpose of replenishing liquid and cooling the screw pump; 2. The present invention is provided with a liquid replenishing tank installed between the liquid outlet pipe and the liquid inlet pipe, and fluid self-circulation is realized through the pressure difference between the pump inlet and outlet. A small part of the oil-gas mixture in the liquid outlet pipe enters the liquid replenishing tank through the liquid replenishing return pipe for replenishment, so that the device does not require an external system to supplement liquid, reducing the use of external liquid replenishing pump equipment, simplifying the production process, improving production efficiency, and reducing production costs; 3. The liquid replenishing tank of the present invention is connected to the liquid outlet pipe through two liquid replenishing return pipes, which is convenient for the oil-gas mixture inside the liquid outlet pipe to be preliminarily separated through the liquid replenishing return pipe on the side of the liquid replenishing tank. The separated oil-gas mixture enters the liquid replenishing tank for secondary separation. The separated gas flows upward back into the liquid outlet pipe, while the liquid stays in the liquid replenishing tank, achieving the purpose of automatic liquid replenishment in the liquid replenishing tank; 4. The filter provided on the liquid inlet pipe of the present invention filters the oil-gas mixture, preventing the oil-gas mixture entering the screw pump from carrying impurities and ensuring the stable operation of the equipment.

[0014] The following will be further described with reference to the accompanying drawings. Brief Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of an automatic liquid replenishing oil-gas mixed transportation device according to an embodiment of the present invention.

[0016] Reference numerals: 1 - support; 2 - screw pump; 3 - liquid outlet pipe; 4 - pressure gauge; 5 - temperature transmitter; 6 - liquid replenishing return pipe; 7 - liquid replenishing tank; 8 - liquid inlet pipe; 9 - cooling conduit; 10 - control valve; 11 - manual liquid inlet valve; 12 - filter; 13 - manual liquid replenishing valve; 14 - check valve; 15 - manual drain valve; 16 - liquid replenishing pipe. Detailed Embodiments Embodiment 1

[0017] As Figure 1As shown in the figure, an automatic liquid-supplying oil-gas mixed transportation device includes a support 1, a screw pump 2, a liquid outlet pipe 3, a liquid-supplying tank 7, and a liquid inlet pipe 8. The screw pump 2 is fixedly installed on the upper surface of the support 1. The input end of the screw pump 2 is connected to the liquid inlet pipe 8, and the output end of the screw pump 2 is connected to the liquid outlet pipe 3. The liquid-supplying tank 7 is connected between the liquid outlet pipe 3 and the liquid inlet pipe 8 through a pipeline. A liquid-supplying return pipe 6 is provided at the upper part of the liquid-supplying tank 7, and the liquid-supplying return pipe 6 is connected to the liquid outlet pipe 3. A liquid-supplying pipe 16 is provided at the bottom of the liquid-supplying tank 7, and the liquid-supplying pipe 16 is connected to the liquid inlet pipe 8. A drain manual valve 15 is provided on the pipeline of the liquid outlet pipe 3 at the end far from the screw pump 2 where it is connected to the liquid-supplying return pipe 6. A pressure gauge 4 and a temperature transmitter 5 are successively provided on the pipeline of the liquid outlet pipe 3 at the end close to the screw pump 2 where it is connected to the liquid-supplying return pipe 6. An inlet liquid manual valve 11 is provided on the pipeline of the liquid-supplying pipe 16 at the end close to the screw pump 2 where it is connected to the liquid inlet pipe 8. A liquid-supplying manual valve 13 is provided on the liquid-supplying pipe 16.

[0018] During the actual use process, in the present invention, the liquid-supplying manual valve 13 is first opened. At this time, due to the self-pressure inside the liquid inlet pipe 8, the liquid inside the liquid inlet pipe 8 enters the liquid-supplying tank 7 for storage. After the liquid-supplying tank 7 is replenished, the liquid-supplying manual valve 13 is manually closed. The screw pump 2 is connected to the power supply, and the inlet liquid manual valve 11 and the drain manual valve 15 are successively opened. At this time, the oil and gas inside the liquid inlet pipe 8 enter the liquid outlet pipe 3 under the action of the screw pump 2. The temperature transmitter 5 is used to detect the temperature of the oil and gas inside the liquid outlet pipe 3. Due to the pressure difference between the liquid inlet pipe 8 and the liquid outlet pipe 3, a small part of the oil and gas in the liquid outlet pipe 3 enters the liquid-supplying tank 7 through the liquid-supplying return pipe 6 for replenishment, and most of the oil and gas are discharged through the drain manual valve 15. In the present invention, through the liquid-supplying tank installed between the liquid outlet pipe and the liquid inlet pipe, fluid self-circulation is realized through the pressure difference between the pump inlet and outlet. A small part of the oil and gas in the liquid outlet pipe enters the liquid-supplying tank through the liquid-supplying return pipe for replenishment, so that the device does not require an external system to supplement liquid, reduces the use of external liquid-supplying pump equipment, simplifies the production process, improves production efficiency, and reduces production costs. Embodiment 2

[0019] Preferably, on the basis of Embodiment 1, in this embodiment, preferably, a cooling conduit 9 is further provided between the liquid-supplying tank 7 and the liquid inlet pipe 8. One end of the cooling conduit 9 is connected to the pipeline between the liquid-supplying manual valve 13 and the liquid-supplying tank 7, and the other end is connected to the pipeline between the filter 12 and the screw pump 2. A control valve 10 is provided on the cooling conduit 9.

[0020] During the actual use process, the temperature transmitter 5 in the present invention is used to detect the temperature of the oil and gas inside the liquid outlet pipe 3. When the temperature exceeds the set value and the control valve 10 is opened, the liquid inside the liquid-supplying tank 7 flows into the screw pump 2 through the cooling conduit 9 and the liquid inlet pipe 8, so that the liquid cools the screw pump 2. Example 3

[0021] Preferably, on the basis of Example 1 or Example 2, in this embodiment, preferably, the liquid replenishment return pipe 6 has two paths, one path is located at the top of the liquid replenishment tank 7, and the other path is located on the upper side surface of the liquid replenishment tank 7. Two temperature transmitters 5 are provided, one is located on the liquid outlet pipe 3 at the output end of the screw pump 2, and the other is located on the pipeline between the two paths of the liquid replenishment return pipe 6 and the liquid outlet pipe 3.

[0022] During actual use, the liquid replenishment return pipe 6 of the present invention has two paths, one path is located at the top of the liquid replenishment tank 7, and the other path is located on the upper side surface of the liquid replenishment tank 7. When the oil and gas enter the liquid replenishment tank 7 through the liquid replenishment return pipe 6 on the side of the liquid outlet pipe 3, the oil and gas entering the interior of the liquid replenishment tank 7 return to the liquid outlet pipe 3 through the liquid replenishment return pipe 6 at the top of the liquid replenishment tank 7, while the liquid remains in the liquid replenishment tank 7 for supplementation. Example 4

[0023] Preferably, on the basis of Example 1, in this embodiment, preferably, the liquid outlet pipe 3 has a "Z" - shaped structure, and a section close to the screw pump 2 and a section connected to the top of the liquid replenishment tank 7 are respectively horizontally arranged.

[0024] During actual use, the liquid outlet pipe 3 of the present invention has a "Z" - shaped structure, and a section close to the screw pump 2 and a section connected to the top of the liquid replenishment tank 7 are respectively horizontally arranged, and the middle section is vertically arranged. The horizontally - arranged section close to the screw pump 2 facilitates the installation of the liquid outlet pipe 3 and the screw pump 2. When the oil and gas enter the vertical section from the horizontal section of the liquid outlet pipe 3, a separation occurs once. The oil and gas in the horizontal section enter the liquid replenishment tank 7 through the liquid replenishment return pipe 6, and the oil and gas entering the interior of the liquid replenishment tank 7 return to the liquid outlet pipe 3 through the liquid replenishment return pipe 6 at the upper end of the liquid replenishment tank 7. Example 5

[0025] Preferably, on the basis of Example 1 or Example 4, in this embodiment, preferably, the liquid inlet pipe 8 has a "Z" - shaped structure, a section close to the screw pump 2 is horizontally arranged, and a section adjacent to the liquid replenishment pipe 16 is vertically arranged.

[0026] During actual use, the liquid inlet pipe 8 of the present invention has a "Z" - shaped structure, a section close to the screw pump 2 is horizontally arranged, which facilitates the installation of the liquid inlet pipe 8 and the screw pump 2, and a section adjacent to the liquid replenishment pipe 16 is vertically arranged, which facilitates the connection with the liquid replenishment pipe 16 at the bottom of the liquid replenishment tank 7. Example 6

[0027] Preferably, on the basis of Example 1 or Example 5, in this embodiment, preferably, a one - way valve 14 is provided on the pipeline between the connection of the liquid outlet pipe 3 and the liquid replenishment return pipe 6 and the drain manual valve 15.

[0028] During actual use, a check valve 14 is provided on the pipeline between the connection of the liquid outlet pipe 3 of the present invention and the liquid discharge manual valve 15 at the connection with the liquid replenishment return pipe 6. The check valve ensures the one-way flow of the oil and gas transported outside the liquid outlet pipe 3. Embodiment 7

[0029] Preferably, on the basis of Embodiment 1 or Embodiment 6, in this embodiment, preferably, a filter 12 is provided on the pipeline between the connection of the liquid replenishment pipe 16 and the liquid inlet pipe 8 and the liquid inlet manual valve 11.

[0030] During actual use, a filter 12 is provided on the pipeline between the connection of the liquid replenishment pipe 16 and the liquid inlet pipe 8 and the liquid inlet manual valve 11 of the present invention, so that the filter filters the oil and gas, avoiding the oil and gas entering the internal of the screw pump from carrying impurities, and ensuring the stable operation of the equipment. Embodiment 8

[0031] A method for using an automatic liquid replenishment oil-gas mixed transportation device, using the above-mentioned automatic liquid replenishment oil-gas mixed transportation device, includes the following steps: S1: First, open the liquid replenishment manual valve 13. At this time, due to the self-pressure in the liquid inlet pipe 8, the liquid inside the liquid inlet pipe 8 enters the liquid replenishment tank 7 for storage. After the liquid replenishment tank 7 is replenished, manually close the liquid replenishment manual valve 13; S2: Connect the screw pump 2 to the power supply, and sequentially open the liquid inlet manual valve 11 and the liquid discharge manual valve 15. At this time, the oil and gas inside the liquid inlet pipe 8 enter the liquid outlet pipe 3 under the action of the screw pump 2. The temperature transmitter 5 is used to detect the temperature of the oil and gas inside the liquid outlet pipe 3. When the temperature exceeds the set value and the control valve 10 is opened, the liquid inside the liquid replenishment tank 7 flows into the screw pump 2 through the cooling conduit 9 and the liquid inlet pipe 8, so that the liquid cools the screw pump 2. Due to the pressure difference between the liquid inlet pipe 8 and the liquid outlet pipe 3, a small part of the oil and gas in the liquid outlet pipe 3 enters the liquid replenishment tank 7 through the liquid replenishment return pipe 6 for replenishment, and most of the oil and gas are discharged through the liquid discharge manual valve 15.

[0032] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An automatic liquid-supplying oil-gas mixed transportation device, characterized in that: It includes a support (1), a screw pump (2), a liquid outlet pipe (3), a liquid replenishing tank (7), and a liquid inlet pipe (8); the screw pump (2) is fixedly installed on the upper surface of the support (1), the input end of the screw pump (2) is connected to the liquid inlet pipe (8), the output end of the screw pump (2) is connected to the liquid outlet pipe (3), the liquid replenishing tank (7) is connected between the liquid outlet pipe (3) and the liquid inlet pipe (8) through a pipeline, a liquid replenishing return pipe (6) is provided at the upper part of the liquid replenishing tank (7), the liquid replenishing return pipe (6) is connected to the liquid outlet pipe (3), a liquid replenishing pipe (16) is provided at the bottom of the liquid replenishing tank (7), the liquid replenishing pipe (16) is connected to the liquid inlet pipe (8), a drain manual valve (15) is provided on the pipeline of the liquid outlet pipe (3) at the end far from the screw pump (2) at the connection with the liquid replenishing return pipe (6), a pressure gauge (4) and a temperature transmitter (5) are successively provided on the pipeline of the liquid outlet pipe (3) at the end close to the screw pump (2) at the connection with the liquid replenishing return pipe (6), an inlet liquid manual valve (11) is provided on the pipeline of the liquid replenishing pipe (16) at the end close to the screw pump (2) at the connection with the liquid inlet pipe (8), and a liquid replenishing manual valve (13) is provided on the liquid replenishing pipe (16).

2. The automatic liquid-supplying oil-gas mixed transportation device according to claim 1, wherein: A cooling conduit (9) is further provided between the liquid replenishing tank (7) and the liquid inlet pipe (8), one end of the cooling conduit (9) is connected to the pipeline between the liquid replenishing manual valve (13) and the liquid replenishing tank (7), the other end is connected to the pipeline between the filter (12) and the screw pump (2), and a control valve (10) is provided on the cooling conduit (9).

3. The automatic liquid supplementing oil-gas mixed transportation device according to claim 1, characterized in that: The liquid replenishing return pipe (6) has two paths, one path is located at the top of the liquid replenishing tank (7), and the other path is located at the upper side surface of the liquid replenishing tank (7). There are two temperature transmitters (5), one is located on the liquid outlet pipe (3) at the output end of the screw pump (2), and the other is located on the pipeline between the two paths of the liquid replenishing return pipe (6) and the connection with the liquid outlet pipe (3).

4. The automatic liquid supplementing oil-gas mixed transportation device according to claim 3, wherein: The liquid outlet pipe (3) is in a "Z" - shaped structure, and a section close to the screw pump (2) and a section connected to the top of the liquid replenishing tank (7) are respectively horizontally arranged.

5. The automatic liquid-supplying oil-gas mixed transportation device according to claim 1, wherein: The liquid inlet pipe (8) is in a "Z" - shaped structure, a section close to the screw pump (2) is horizontally arranged, and a section adjacent to the liquid replenishing pipe (16) is vertically arranged.

6. The automatic liquid-supplying oil-gas mixed transportation device according to claim 1, wherein: A check valve (14) is provided on the pipeline of the liquid outlet pipe (3) between the connection with the liquid replenishing return pipe (6) and the drain manual valve (15).

7. The automatic liquid supplementing oil-gas mixed transportation device according to claim 1, wherein: A filter (12) is provided on the pipeline of the liquid replenishing pipe (16) between the connection with the liquid inlet pipe (8) and the inlet liquid manual valve (11).

8. A method for using an automatic liquid replenishing oil-gas mixed transportation device, which uses the automatic liquid replenishing oil-gas mixed transportation device as described in claim 2, and is characterized in that: It includes the following steps: S1: First, open the liquid replenishing manual valve (13). At this time, due to the self - pressure inside the liquid inlet pipe (8), the liquid inside the liquid inlet pipe (8) enters the liquid replenishing tank (7) for storage. After the liquid replenishing tank (7) is replenished, manually close the liquid replenishing manual valve (13); S2: Connect the screw pump (2) to the power supply, and sequentially open the inlet manual valve (11) and the drain manual valve (15). At this time, the oil and gas inside the inlet pipe (8) enter the outlet pipe (3) under the action of the screw pump (2). The temperature transmitter (5) is used to detect the temperature of the oil and gas inside the outlet pipe (3). When the temperature exceeds the set value and the control valve (10) opens, the liquid inside the liquid replenishment tank (7) flows into the screw pump 2 through the cooling conduit (9) and the inlet pipe (8), so that the liquid cools down the screw pump (2). Due to the pressure difference between the inlet pipe (8) and the outlet pipe (3), a small part of the oil and gas in the outlet pipe (3) enters the liquid replenishment tank (7) through the liquid replenishment return pipe (6) for replenishment, and most of the oil and gas are discharged through the drain manual valve (15).

Images