Liquid-injection oil-gas mixed transmission device

Abstract

The present invention discloses a liquid-infusion type oil-gas mixed transportation device, which relates to the technical field of oil-gas transportation, and solves the problem that the existing oil-gas mixed transportation device has slug flow under high gas content working conditions, and the mixed transportation pump is prone to failure. The technical scheme adopted is: the liquid-infusion type oil-gas mixed transportation device includes a mixed transportation pump, the inlet end and the outlet end of the mixed transportation pump are respectively connected to the mixed transportation inlet pipe and the mixed transportation discharge pipe, the mixed transportation discharge pipe is connected to a tee, one branch of the tee is provided with a valve and connected to the mixed transportation discharge main pipe, the other branch is provided with a valve and connected to a gas-liquid separator, the gas outlet of the gas-liquid separator is provided with a valve and connected to the mixed transportation discharge main pipe, the liquid outlet is provided with a valve and connected to the mixed transportation discharge main pipe, and the liquid outlet is also connected to the inlet end of the mixed transportation pump through a first liquid-infusion pipe. The mixed transportation pump is provided with a cooling structure. The liquid-infusion type oil-gas mixed transportation device also includes a liquid-infusion tank, which is connected to the inlet end of the mixed transportation pump through a second liquid-infusion pipe. The present invention is suitable for oil-gas mixed transportation under high gas content working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas transportation, and in particular to a liquid-supplementing oil and gas mixed transportation device and method. Background Art

[0002] The western oil region is represented by Changqing Oilfield (China's largest oilfield) and Tarim Oilfield (China's third largest oilfield). The natural gas output in the west far exceeds that of crude oil. As the starting point of the West-East Gas Transmission Project, it has become an important source of clean energy for the country.

[0003] The oil and gas from several production wells are gathered and then transported to the external transmission station, and then transported to a large processing station for processing. The traditional transportation method is to separate the oil and gas, and the separated gas is transported to the processing station for dehydration and desulfurization through a compressor. The separated oil-water mixture is transported by pumping or car or transported to the processing station for dehydration and sand removal. The traditional processing method often requires the construction of two oil and gas transmission pipelines, and the installation of large separators, heating devices (such as heating furnaces), compressors, external transmission pumps, etc., which requires a large investment, especially in the desert production areas of the Loess Plateau and the Tarim Basin. The production management cost has also increased, which is no longer suitable for the current international situation and the requirements of improving quality and efficiency.

[0004] At present, the emerging transportation method is: the produced oil and gas are directly mixed and transported without separation, external transmission station, separator and heating furnace, and only transported to the large station through a mixed pipeline for separation and treatment. The emerging transportation method can greatly reduce investment costs, management difficulties and labor costs; at the same time, due to the elimination of pressure vessels, the safety level is reduced and production energy consumption is reduced. The existing mixed pumps can usually only adapt to working conditions with a gas content of less than 80%, while the gas content of the above-mentioned oil field conditions is often more than 95% or even higher. Under such a high gas content condition, the mixed pump heats up quickly, resulting in the mixed pump being unable to work normally. Summary of the invention

[0005] The invention provides a liquid-supplementing oil-gas mixed transmission device, which solves the problems that slug flow occurs in the existing oil-gas mixed transmission device under high gas content rate working conditions and the mixed transmission pump is prone to failure.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a liquid-inflating type oil-gas mixed flow device, including a mixed flow pump, the inlet end of the mixed flow pump is connected to the mixed flow inlet pipe, the outlet end of the mixed flow pump is connected to the mixed flow discharge pipe, the mixed flow discharge pipe is connected to a tee, one branch of the tee is provided with a valve and connected to the mixed flow discharge main pipe, the other branch of the tee is provided with a valve and connected to a gas-liquid separator, the gas outlet of the gas-liquid separator is provided with a valve and connected to the mixed flow discharge main pipe, the liquid outlet of the gas-liquid separator is provided with a valve and connected to the mixed flow discharge main pipe, the liquid outlet of the gas-liquid separator is provided with a valve and connected to the mixed flow discharge main pipe, and the liquid outlet of the gas-liquid separator is also connected to the inlet end of the mixed flow pump through a first liquid inflating pipe, and a valve is provided on the first liquid inflating pipe.

[0007] Furthermore, a first cooler is arranged on the first liquid replenishing pipe.

[0008] Furthermore, the first liquid replenishing pipe is provided with a valve, a first cooler, a thermometer, a flow meter and a valve in sequence from the liquid inlet end to the liquid outlet end.

[0009] Furthermore, the liquid-infusion type oil-gas mixed flow device also includes a liquid infusion tank, which is connected to the inlet end of the mixed flow pump through a second liquid infusion pipe, and a first pipeline pump and a valve are arranged on the second liquid infusion pipe, wherein the liquid inlet end of the first pipeline pump is connected to the liquid infusion tank.

[0010] Furthermore, a first check valve is also arranged on the second liquid replenishing pipe, and a gas-liquid separator and a liquid replenishing tank are arranged on the liquid replenishing skid.

[0011] Furthermore, a cooling structure is provided on the mixed flow pump.

[0012] Specifically: the cooling structure is: the mixed flow pump is provided with a pump body interlayer, the pump body interlayer is provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are provided with cooling pipelines, and the cooling pipeline is provided with a valve, a cooling medium box, a second pipeline pump, a second cooler and a filter in sequence from the liquid outlet to the liquid inlet.

[0013] Furthermore, a first safety valve is arranged on the top of the gas-liquid separator, a drain valve is arranged on the bottom, and a temperature measuring device is also arranged on the gas-liquid separator.

[0014] Furthermore, a bypass pipe is arranged between the inlet and outlet of the mixed flow pump, a second safety valve is arranged on the bypass pipe, valves are arranged at the inlet and outlet of the second safety valve respectively, a connecting pipe is arranged between the inlet end of the valve at the inlet end of the second safety valve and the outlet end of the mixed flow pump, and a valve is arranged on the connecting pipe.

[0015] Furthermore, a valve and a filter device are arranged on the mixed flow inlet pipe, and a second check valve is arranged on the mixed flow outlet pipe.

[0016] The beneficial effect of the present invention is that after the oil-gas mixture is pressurized by the mixed flow pump, it enters the gas-liquid separator, and the separated liquid enters the mixed flow pump through the first liquid replenishment pipe, thereby increasing the proportion of liquid in the oil-gas mixture entering the mixed flow pump, and adapting to production conditions with high gas content and frequent slug flow.

[0017] The first liquid replenishment pipe is provided with a first cooler to cool the separated liquid before entering the mixed pump, which is beneficial to controlling the temperature of the mixed pump. The liquid replenishment type oil and gas mixed delivery device also includes a liquid replenishment tank, which can replenish liquid to the mixed delivery pump through the second liquid replenishment pipe to increase the proportion of liquid entering the delivery pump. The mixed delivery pump is provided with a cooling structure to cool the mixed delivery pump to ensure the safe and normal operation of the mixed delivery pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a schematic diagram of the liquid-supplementing oil-gas mixed transmission device of the present invention.

[0019] Figure numerals: mixed flow pump 1, mixed flow inlet pipe 2, mixed flow discharge pipe 3, mixed flow discharge main pipe 4, gas-liquid separator 5, first liquid replenishment pipe 6, first cooler 7, flow meter 8, liquid replenishment tank 9, second liquid replenishment pipe 10, first pipeline pump 11, first check valve 12, cooling pipeline 13, cooling medium box 14, second pipeline pump 15, second cooler 16, filter 17, first safety valve 18, drain valve 19, bypass pipe 20, second safety valve 21, connecting pipe 22, filtering device 23, second check valve 24. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] like Figure 1 As shown, the liquid-supplementing oil-gas mixed flow device of the present invention comprises a mixed flow pump 1, the inlet end of the mixed flow pump 1 is connected to the mixed flow inlet pipe 2, and the oil-gas mixture enters the mixed flow pump 1 from the mixed flow inlet pipe 2 for pressurized mixed flow. A valve and a filter device 23 are arranged on the mixed flow inlet pipe 2, so that the oil-gas mixture can enter the mixed flow pump 1 after filtering impurities, so as to protect the mixed flow pump 1 and make it run smoothly. For example, an electric ball valve is arranged on the mixed flow inlet pipe 2, and the electric ball valve is controlled by an instrument sensor, etc., so as to control the inlet and outlet flow. The outlet end of the mixed flow pump 1 is connected to the mixed flow discharge pipe 3, and the mixed flow discharge pipe 3 is connected to a tee, one branch of the tee is provided with a valve and connected to the mixed flow discharge main pipe 4, and the other branch of the tee is provided with a valve and connected to a gas-liquid separator 5. In order to avoid backflow, a second check valve 24 is arranged on the mixed flow discharge pipe 3, and an electric ball valve is arranged between the second check valve 24 and the tee.

[0022] In order to ensure the safety of the mixed flow pump 1 and prevent the mixed flow discharge pipe 3 from being over-pressured and causing damage to the mixed flow pump 1, a bypass pipe 20 is provided between the inlet and outlet ends of the mixed flow pump 1, a second safety valve 21 is provided on the bypass pipe 20, and valves are provided at the inlet and outlet ends of the second safety valve 21, respectively. A connecting pipe 22 is provided between the inlet end of the valve at the inlet end of the second safety valve 21 and the outlet end of the mixed flow pump 1, and a valve is provided on the connecting pipe 22. The connecting pipe 22 is actually directly connected to the inlet and outlet ends of the mixed flow pump 1. If there is positive pressure in the mixed flow inlet pipe 2 and the mixed flow pump 1 is undergoing maintenance, the oil-gas mixture can flow out directly through the connecting pipe 22. Temperature and pressure measuring devices are provided at the outlet and inlet sides of the mixed flow pump 1, respectively.

[0023] The gas outlet of the gas-liquid separator 5 is provided with a valve and connected to the mixed discharge main pipe 4. Figure 1In the figure, the gas outlet of the gas-liquid separator 5 is arranged at the upper part of the gas-liquid separator 5. The liquid outlet of the gas-liquid separator 5 is provided with a valve and connected to the mixed transport discharge main pipe 4. The liquid outlet of the gas-liquid separator 5 is also connected to the inlet end of the mixed transport pump 1 through the first liquid replenishing pipe 6, and a valve is arranged on the first liquid replenishing pipe 6. The first safety valve 18 is arranged at the top of the gas-liquid separator 5, and the drain valve 19 is arranged at the bottom. The gas-liquid separator 5 is also provided with a temperature meter. When the oil-gas mixed output presents a slug flow and the mixed transport pump 1 cannot transport, the separated liquid is transported to the inlet end of the mixed transport pump 1 through the first liquid replenishing pipe 6 to reduce the gas content in the oil-gas mixture entering the mixed transport pump 1 to ensure normal transportation.

[0024] The greater the gas content of the oil-gas mixture, the higher the delivery temperature, and at the same time the temperature of the pump body of the mixed delivery pump 1 also rises (can reach 120°C), and the temperature of the liquid separated by the gas-liquid separator 5 is correspondingly high. The liquid separated by the gas-liquid separator 5 is usually a low-water condensate oil, which begins to fractionate at 20°C and vaporizes or even turns into a gas at 80°C, failing to meet the liquid replenishment requirements. Instead, the temperature of the pump body of the mixed delivery pump 1 continues to rise, forming a vicious circle. Therefore, the liquid separated by the gas-liquid separator 5 must be cooled, for example, to about 50°C, so that it is basically in a liquid state, can lubricate the spiral sleeve and form an oil film sealing cavity, and ensure normal gas transportation. It is best to set a first cooler 7 on the first liquid replenishment pipe 6. Figure 1 As shown, the first liquid replenishing pipe 6 is provided with a valve, a first cooler 7, a thermometer, a flow meter 8 and a valve in sequence from the liquid inlet end to the liquid outlet end. Among them, the flow meter 8 is first connected in series with the control valve and then in parallel with the ball valve, and the valve at the outlet of the flow meter 8 is preferably an electric ball valve.

[0025] In order to avoid the situation where the first liquid replenishment pipe 6 is insufficiently replenished, the liquid replenishment type oil-gas mixed delivery device also includes a liquid replenishment tank 9, which is connected to the inlet end of the mixed delivery pump 1 through a second liquid replenishment pipe 10. A first pipeline pump 11 and a valve are arranged on the second liquid replenishment pipe 10, wherein the liquid inlet end of the first pipeline pump 11 is connected to the liquid replenishment tank 9. The second liquid replenishment pipe 10 and the first liquid replenishment pipe 6 are independently controlled, and liquid replenishment can be performed at the same time, or any one of them can be selected for liquid replenishment. The liquid in the liquid replenishment tank 9 can be water, preferably an oil-water mixture; the liquid replenishment tank 9 can be replenished by a tank truck, or by a pipeline. A first check valve 12 is also arranged on the second liquid replenishment pipe 10.

[0026] In high-gas-content working conditions, when the liquid is less or even in a pure gas state, the temperature of the mixed pump 1 will gradually rise, especially at the outlet. In order to cool the mixed pump 1, a cooling structure is provided for the mixed pump 1, and the cooling method of the cooling structure can be air cooling, water cooling or oil cooling. Figure 1As shown, the mixed flow pump 1 is provided with a pump body interlayer, the pump body interlayer is provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are provided with a cooling pipeline 13, and the cooling pipeline 13 is provided with a valve, a cooling medium box 14, a second pipeline pump 15, a second cooler 16 and a filter 17 in sequence from the liquid outlet to the liquid inlet. Two valves can be provided between the liquid outlet of the cooling pipeline 13 and the cooling medium box 14, and a temperature measuring device is provided between the two valves. A valve is provided between the cooling medium box 14 and the second pipeline pump 15. The mixed flow pump 1 is a screw pump, which is driven by a variable frequency motor. The mixed flow pump 1 introduces a cooling medium circulation to cool down and dissipate heat to ensure the safe and normal operation of the mixed flow pump 1, and at the same time, it can alleviate the vaporization of the infusion liquid in the first infusion tube 6 and the second infusion tube 10.

[0027] Mixing pump 1 generates a certain amount of heat during the process of conveying the medium, which is generally carried away by the medium. However, when the temperature of the medium is higher than the temperature of mixing pump 1, the medium not only cannot carry away the heat, but will cause the temperature of the pump body of mixing pump 1 to continue to rise, thereby affecting the smooth operation of mixing pump 1. The cooling structure of mixing pump 1 reduces the temperature of the pump body and ensures the smooth operation of mixing pump 1.

[0028] The cooling structure of the mixed flow pump 1 and the mixed flow pump 1 are arranged on the pump skid, and the gas-liquid separator 5 and the liquid replenishing tank 9 are arranged on the liquid replenishing skid. Figure 1 As shown in the two dotted boxes. The skid room is an insulated corrugated board room equipped with gas detection devices, ventilation devices, heating and video monitoring devices. The pump skid size can be 8000mm×3400mm×2950mm, and the liquid replenishment skid size can be 7000mm×3000mm×2950mm.

Claims

1. A liquid-injection type oil-gas mixed delivery device, comprising a mixed delivery pump (1), wherein the inlet end of the mixed delivery pump (1) is connected to a mixed delivery inlet pipe (2), and the outlet end of the mixed delivery pump (1) is connected to a mixed delivery outlet pipe (3), characterized in that: The mixed flow discharge pipe (3) is connected to a tee, one branch of the tee is provided with a valve and connected to the mixed flow discharge main pipe (4), the other branch of the tee is provided with a valve and connected to a gas-liquid separator (5), the gas outlet of the gas-liquid separator (5) is provided with a valve and connected to the mixed flow discharge main pipe (4), the liquid outlet of the gas-liquid separator (5) is provided with a valve and connected to the mixed flow discharge main pipe (4), the liquid outlet of the gas-liquid separator (5) is provided with a valve and connected to the mixed flow discharge main pipe (4), the liquid outlet of the gas-liquid separator (5) is also connected to the inlet end of the mixed flow pump (1) through a first liquid replenishment pipe (6), the first liquid replenishment pipe (6) is provided with a valve and a first cooler (7); the liquid replenishment type oil-gas mixed flow device also includes a liquid replenishment tank (9), the liquid replenishment tank (9) is connected to the inlet end of the mixed flow pump (1) through a second liquid replenishment pipe (10), the second liquid replenishment pipe (10) is provided with a first pipeline pump (11) and a valve, wherein the liquid inlet end of the first pipeline pump (11) is connected to the liquid replenishment tank (9); The mixed flow pump (1) is provided with a cooling structure, wherein the cooling structure comprises: the mixed flow pump (1) is provided with a pump body interlayer, the pump body interlayer is provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are provided with a cooling pipeline (13), and the cooling pipeline (13) is provided with a valve, a cooling medium box (14), a second pipeline pump (15), a second cooler (16) and a filter (17) in sequence from the liquid outlet to the liquid inlet; A bypass pipe (20) is arranged between the inlet end and the outlet end of the mixed flow pump (1), a second safety valve (21) is arranged on the bypass pipe (20), valves are arranged at the inlet end and the outlet end of the second safety valve (21), a connecting pipe (22) is arranged between the inlet end of the valve at the inlet end of the second safety valve (21) and the outlet end of the mixed flow pump (1), and a valve is arranged on the connecting pipe (22).

2. The liquid-infusing oil-gas mixed delivery device according to claim 1, characterized in that: The first liquid replenishing pipe (6) is provided with a valve, a first cooler (7), a thermometer, a flow meter (8) and a valve in sequence from the liquid inlet end to the liquid outlet end.

3. The liquid-supplementing oil-gas mixed delivery device according to claim 1, characterized in that: A first check valve (12) is also provided on the second liquid replenishing pipe (10), and the gas-liquid separator (5) and the liquid replenishing tank (9) are provided on the liquid replenishing skid.

4. The liquid-supplementing oil-gas mixed transport device according to any one of claims 1 to 3, characterized in that: A first safety valve (18) is arranged at the top of the gas-liquid separator (5), and a drain valve (19) is arranged at the bottom. The gas-liquid separator (5) is also provided with a temperature measuring device.

5. The liquid-supplementing oil-gas mixed transport device according to any one of claims 1 to 3, characterized in that: A valve and a filter device (23) are provided on the mixed flow inlet pipe (2), and a second check valve (24) is provided on the mixed flow outlet pipe (3).

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