CN201963278U - Oil well casing gas booster recovery device - Google Patents

Abstract

The oil well casing gas pressurizing and recovering device is used in recovering casing gas from oil producing well in oil field. The oil delivery pipe at the wellhead of the Christmas tree is connected with a constant pressure air release valve, and the air inlet of the constant pressure air release valve is connected with a high-pressure hose; the other end of the high-pressure hose is connected with an outlet pipe of the gas booster pump, and the outlet pipe of the gas booster pump is connected with an outlet of the gas booster pump; the outlet pipe of the gas booster pump is provided with a three-way connecting pipeline, the other end of the pipeline is connected with the outlet of the one-way valve, the inlet of the one-way valve is provided with a pipeline connected with a gas flowmeter, and the inlet pipeline of the gas flowmeter is connected with a pressure gauge; an inlet pipeline of the gas flowmeter is connected with the casing joint; the pipeline between the gas flowmeter and the one-way valve is provided with a three-way connection gas booster pump inlet pipe. The effect is as follows: when the pressure of the casing pipe of the oil well is higher than the back pressure of the oil pipe, the casing gas can be recovered at a constant pressure, and the purposes of improving the pump efficiency and the crude oil yield are achieved; when the casing pressure is lower than the back pressure, the low-pressure casing gas is pressurized to a state larger than the back pressure of the oil well, and the casing gas can be recovered.

Description

Oil well casing gas booster recovery device

technical field

The utility model relates to the technical field of oil recovery in oilfields. In particular, the utility model relates to a special device for recovering oil well casing gas in the process of oil production, and is a pressurized recovery device for oil well casing gas.

Background technique

Oil well casing gas is an associated scattered natural gas resource in the oil well production process. With the natural decline of oil well formation energy, the casing pressure gradually decreases. The casing pressure is lower than the back pressure of the oil well main line and cannot automatically enter the oil main line. However, once the casing gas is suppressed and the gas invades the oil pump, it will cause the oil well to reduce production. Therefore, the method of venting the casing gas to the air is generally adopted to reduce the pressure in the casing. As a result, casing gas pollutes the environment, oil production well sites are flammable and explosive, and natural gas resources are seriously wasted. If the low-pressure casing gas is pressurized and recovered, and used for domestic gas and natural gas power generation, it will not only have obvious economic benefits, but also achieve energy saving and emission reduction, and have good comprehensive social benefits.

At present, there are mainly two methods for recovering low-pressure casing gas in China. One is to install the cylinder on the pumping unit or the Christmas tree, and use the reciprocating movement of the beam or polished rod of the pumping unit to drive the reciprocating movement of the piston of the cylinder to achieve the purpose of pressurizing the casing gas. However, such a linkage method has the disadvantages of high installation cost, hot construction and use of engineering vehicles, and the disadvantages of affecting the safe operation of the pumping unit during operation, and even the accident of "overturning" of the pumping unit. The second is to use a vehicle-mounted compressor unit to move and recover casing gas. There are two main problems in the use of this method: the main reason is that it is impossible to recover the casing gas of each well at the same time; secondly, the cost of manpower and transportation is high and the rate of implementation of measures is low, so it cannot produce large-scale economic benefits.

Utility model content

The purpose of the utility model is to provide a casing gas pressurization and recovery device for an oil well, which adopts the casing gas self-pressurization method to achieve the purpose of pressurization and recovery of the casing gas.

The technical scheme adopted by the utility model is: oil well casing gas pressurized recovery device, which is mainly composed of a constant pressure release valve, a high pressure hose, a casing joint, a pressure gauge, a gas flow meter, a one-way valve and a gas booster pump , is characterized in that: the wellhead oil pipeline of the oil tree is connected with a constant pressure release valve, and the constant pressure air release valve sets the casing pressure to discharge casing gas into the oil pipeline under a reasonable casing pressure, and prevents the crude oil inside the oil pipeline from flowing back. The air inlet of the constant pressure release valve is connected to the high-pressure hose; the other end of the high-pressure hose is connected to the outlet pipe of the gas booster pump, and the outlet pipe of the gas booster pump is connected to the outlet of the gas booster pump; there are three holes on the outlet pipe of the gas booster pump. There is a pipeline through the tee, the other end of the pipeline is connected to the outlet of the one-way valve, the inlet of the one-way valve is connected to the outlet of the gas flowmeter by a pipeline, and the inlet pipeline of the gas flowmeter is connected to a pressure gauge, which can monitor the casing The pressure change, the flowmeter can monitor the change of the instantaneous flow rate of the casing gas; the inlet pipeline of the gas flowmeter is connected to the casing joint; there is a three-way on the pipeline between the gas flowmeter and the one-way valve, and the gas is connected through the three-way The inlet pipe of the booster pump is connected with the inlet of the gas booster pump. The one-way valve and the pneumatic booster pump are connected in parallel to prevent the occurrence of casing pressure suppression caused by the throttling of the gas booster pump when the casing pressure is suddenly higher than the back pressure, and prevent the casing gas after boosting from returning to the casing middle. Pneumatic booster pumps rely on casing gas pressure as the driving pressure. Gas booster pump and constant pressure release valve are existing products, which can be purchased in the market.

In order to protect the pressurized recovery device from the influence of the field environment. An airtight box body is welded, and the box body is welded on the casing joint. There are pressure gauge, gas flow meter, check valve, gas booster pump outlet pipe, gas booster pump inlet pipe and gas booster pump in the box body.

Briefly describe the working principle of the oil well casing gas booster recovery device: refer to Figure 1. Connect the casing joint 5 to the casing outlet of the pumping well being produced; the end of the oil delivery pipe 1 is connected to a constant pressure relief valve 2, and the pressure regulating rod 3 of the relief valve is rotated to adjust the discharge gas of the constant pressure relief valve 2 pressure. When the oil well casing pressure is higher than the set pressure, the casing gas directly enters the constant pressure release valve 2 through the check valve 9 and the release high pressure hose 4, and is discharged according to the set pressure through the constant pressure release valve 2 into the pipeline 1. When the casing pressure is lower than the oil pipe back pressure (set pressure), the gas passes through the gas flow meter 8 and then enters the pneumatic booster pump 12. Press and release valve 2, and then enter the metering station through oil well pipeline 1 to achieve the purpose of recovery.

Beneficial effects of the utility model: the utility model oil well casing gas pressurized recovery device, when the oil well casing pressure is higher than the tubing back pressure, the casing gas can be recovered at a constant pressure to achieve the purpose of improving pump efficiency and crude oil production; casing pressure When it is lower than the back pressure, pressurizing the low-pressure casing gas to a state higher than the back pressure of the oil well can also recover the casing gas.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the utility model oil well casing gas pressurized recovery device.

In the figure, 1-oil pipeline; 2-constant pressure release valve; 3-pressure regulating rod of release valve; 4-high pressure hose; 5-casing joint; 6-box; 7-pressure gauge; 8-gas flow 9-one-way valve; 10-gas booster pump outlet pipe; 11-gas booster pump inlet pipe; 12-gas booster pump.

Detailed ways

Embodiment 1: Taking an oil well casing gas pressurized recovery device as an example, the utility model is further described in detail.

See Figure 1. The utility model oil well casing gas pressurized recovery device mainly consists of a constant pressure release valve 2, a high pressure hose 4, a casing joint 5, a box body 6, a pressure gauge 7, a gas flow meter 8, a one-way valve 9 and a gas Booster pump 12 forms.

The end of the oil delivery pipe 1 at the wellhead of the Christmas tree is connected with a constant pressure release valve 2 . The air inlet of the constant pressure release valve 2 is connected with a high-pressure hose 4 . The other end of the high-pressure hose 4 is connected to the outlet pipe 10 of the gas booster pump. The outlet pipe 10 of the gas booster pump is connected to the outlet of the gas booster pump 12; there is a tee on the outlet pipe 10 of the gas booster pump, through which a pipeline is connected, and the other end of the pipeline is connected to the outlet of the one-way valve 9, The inlet of the one-way valve 9 has a pipeline connected to the outlet of the gas flow meter 8 . A pressure gauge 7 is connected to the inlet pipeline of the gas flow meter 8 . The inlet pipeline of the gas flowmeter 8 is connected with the casing joint 5 . There is a tee on the pipeline between the gas flowmeter 8 and the one-way valve 9, and the gas booster pump inlet pipe 11 is connected through this tee, and the gas booster pump inlet pipe 11 is connected with the gas booster pump 12 inlet.

An airtight casing 6 is welded, and the casing 6 is welded on the casing joint 5 . Pressure gauge 7 , gas flowmeter 8 , one-way valve 9 , gas booster pump outlet pipe 10 , gas booster pump inlet pipe 11 and gas booster pump 12 are inside the box body 6 .

Claims (2)

1. well casing gas boosting recovery device, mainly form by valve discharging gas under certain pressure (2), high-pressure hose (4), casing joint (5), pressure meter (7), gas flowmeter (8), one way valve (9) and gas booster pump (12), it is characterized in that: production tree well head petroleum pipeline (1) connects valve discharging gas under certain pressure (2), and the air inlet port of valve discharging gas under certain pressure (2) connects high-pressure hose (4); The other end of high-pressure hose (4) connects gas boosting pump discharge pipe (10), and gas boosting pump discharge pipe (10) connects the outlet of gas boosting pump (12); The gas boosting pump discharge pipe has threeway on (10), be connected with pipeline by threeway, the other end of pipeline connects the outlet of one way valve (9), and the inlet of one way valve (9) has pipeline to connect gas flowmeter (8) outlet, is connected with pressure meter (7) on gas flowmeter (8) suction line; The suction line of gas flowmeter (8) is connected with casing joint (5); On the pipeline between gas flowmeter (8) and the one way valve (9) threeway is arranged, be connected with gas boosting pump inlet pipe (11) by threeway, gas boosting pump inlet pipe (11) is connected with gas boosting pump (12) import.

2. well casing gas boosting recovery device according to claim 1, it is characterized in that: be welded with airtight casing (6), casing (6) is welded in the casing joint (5), and pressure meter (7), gas flowmeter (8), one way valve (9), gas boosting pump discharge pipe (10), gas boosting pump inlet pipe (11) and gas booster pump (12) are arranged in the casing (6).

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