CN202832408U - Submersible screw pump gas lift composite pipe string for drainage and gas recovery - Google Patents

Abstract

The oil-submersible screw pump gas-lift composite pipe column for water drainage and gas production is applied to underground gas production in oil and gas fields. The screen pipe is positioned at the lowest end of the composite pipe column, the upper end of the screen pipe is connected with an oil-submersible screw pump, the upper end of the oil-submersible screw pump is connected with an automatic reversing device through an oil pipe, the upper end of the automatic reversing device is connected with a gas lifting tool through an oil pipe, the upper end of the gas lifting tool is connected with an oil pipe, and the oil pipe is always connected to a well head; a cable is arranged in the annular space between the sleeve and the oil pipe, and the lower end of the cable is connected with a motor of the submersible screw pump. The effect is as follows: the well can be drained continuously in the period before workover treatment; the well can be drained continuously under the condition that the original well pipe column is not moved.

Description

Submersible screw pump gas lift composite pipe string for drainage and gas recovery

technical field

The utility model relates to the technical field of gas recovery in oil and gas fields, in particular to an underground composite gas recovery pipe string, which is a gas lift composite pipe string with a submersible screw pump used in the implementation of drainage gas recovery technology.

Background technique

At present, the implementation of submersible screw pump drainage and gas recovery technology in water-producing gas wells can forcibly lower the bottom-hole flow pressure to achieve the purpose of opening the production pressure difference and removing bottom-hole fluid accumulation, ensuring drainage and revitalizing the gas well. The wells targeted by the submersible screw pump drainage and gas recovery process are gas reservoir drainage wells and water flooded wells. Once the submersible screw pump fails to work due to downhole failure, workover operations are required, otherwise production cannot continue. During the period before the workover, because the normal drainage cannot be guaranteed, the production of adjacent wells will be affected for drainage wells in gas reservoirs; and the resumption of production of the well will be affected for water-flooded wells. China Patent Office has disclosed a utility model patent named "full immersion oil production device of single screw submersible pump"; announcement number: 2081882. The output shaft of the submersible motor installed in the oil well is connected with the transmission shaft of the bevel gear planetary reducer through the spline sleeve, the motor casing and the reducer shell wall are connected through a detachable joint, and the output shaft of the reducer is connected through the spline The sleeve is connected to the drive shaft of the motor protector, the other end of the reducer shell wall is connected to the protector shell through a detachable joint, and the other end of the drive shaft of the motor protector is connected to the pump shaft of the single screw submersible pump through a spline sleeve to protect The connection between the other end of the housing and the pump body is a detachable joint. The oil outlet of the pump is connected to the oil delivery pipe through a threaded joint. And the drain valve, the other end of the oil pipeline is connected to the oil and gas separation device installed on the ground, and the submersible motor is connected to the mains through the downhole cable. To a certain extent, the device can achieve the purpose of widening the production pressure difference, removing the liquid accumulation at the bottom of the well, ensuring drainage and reviving the gas well. However, there is still a need to carry out workover operations when the well cannot work due to downhole failures, otherwise the production cannot continue. During the period before the workover, because the normal drainage cannot be guaranteed, the production of adjacent wells will be affected for drainage wells in gas reservoirs. Well flooding will affect the problem of resuming production of the well.

Utility model content

The purpose of the utility model is: to provide a submersible screw pump gas-lift composite pipe string for drainage and gas recovery, which can continue to drain the well before workover, and reduce the adverse effects caused by the failure of the submersible screw pump to work.

The technical solution adopted in the utility model is: a gas-lift composite pipe string of a submersible screw pump for drainage and gas recovery, including a gas lift tool, an automatic reversing device, a submersible screw pump, a downhole cable, a screen pipe and an oil pipe, and a screen pipe Located at the lowest end of the composite string, the upper end of the screen is connected to the submersible screw pump, the upper end of the submersible screw pump is connected to the automatic reversing device through the oil pipe, and the upper end of the automatic reversing device is connected to the gas lift tool through the oil pipe. The upper end of the lifting tool is connected with an oil pipe, and the oil pipe is connected to the wellhead; a cable is lowered through the annular space between the casing and the oil pipe, and the lower end of the cable is connected to the motor of the submersible screw pump. The cable provides electrical energy to the submersible screw pump. The automatic reversing device plays the role of communicating or closing the communication between oil pipe and casing. The automatic reversing device acts as a check valve and a drain valve.

The number of oil pipes between the automatic reversing device and the submersible screw pump is 1-2.

The distance between the gas lift tool and the automatic reversing device is between 80m and 120m.

The automatic reversing device is an automatic reversing valve or a sliding sleeve, and the gas lift tool is a gas lift mandrel and a gas lift valve.

Briefly describe the installation and use process of the submersible screw pump gas lift composite pipe string used for drainage and gas recovery. See Figure 1. During the well construction, the screen pipe 6 and the submersible screw pump 3 are lowered first, followed by the automatic reversing device 2 and the gas lift tool 1 in sequence. When the submersible screw pump 3 is working normally, the channel connecting the oil pipe and the oil jacket annulus in the automatic reversing device 2 is closed, and the fluid lifted by the submersible screw pump 3 passes through the internal channel of the automatic reversing device 2 and passes through the gas lift. The inner space of the tool 1 flows upwards along the oil pipe 5, and finally reaches the ground to complete the process of being lifted.

When the submersible screw pump 3 breaks down and fails to lift the fluid, the original well string is replaced with a gas lift process to continue drainage. After the submersible screw pump 3 stops working, the channel connecting the oil pipe and the oil jacket annulus in the automatic reversing device 2 is opened, and the gas can be injected from the oil pipe or the casing, and the gas lift tool 1 can be used as the gas injection channel. Lift continues to lift fluid.

When in normal operation, the submersible screw pump 3 lifts the liquid upward, and the automatic reversing device 2 (automatic reversing valve) closes the passage between the oil pipe and the casing, and the liquid passes through the internal passage of the automatic reversing device 2 along the oil pipe and through the gas The inner channel of the lifting mandrel is lifted upwards to the ground. When the unit fails to operate, the channel of the automatic reversing device 2 to communicate with the annular space between the oil pipe and the casing is opened, or the channel on the automatic reversing device 2 is opened by wire operation. When the gas lift production method is used instead, it can be Gas lift drainage is implemented by injecting gas into the casing or tubing.

Beneficial effects of the utility model: the gas-lift composite string of the submersible screw pump used for drainage and gas recovery of the utility model, compared with the single string of the traditional submersible screw pump, can be used in the period of time before the workover operation. , continue to implement drainage to the well; continue to implement drainage to the well without moving the original well string.

Description of drawings

Fig. 1 is a schematic structural diagram of a gas-lift composite pipe string of a submersible screw pump for drainage and gas recovery of the present invention.

In the figure, 1- gas lift tool, 2- automatic reversing device, 3- submersible screw pump, 4- downhole cable, 5- tubing, 6- screen.

Detailed ways

Embodiment 1: Taking a submersible screw pump gas-lift composite string used for drainage and gas recovery as an example, the utility model is further described in detail.

See Figure 1. The utility model is a submersible screw pump gas-lift composite pipe string used for drainage and gas recovery, comprising a gas lift tool 1, an automatic reversing device 2, a submersible screw pump 3, a downhole cable 4, a screen 6 and an oil pipe 5. The automatic reversing device 2 is an automatic reversing valve. The gas lift tool 1 is a gas lift mandrel and a gas lift valve. What oil pipe 5 adopts is the thickened oil pipe of 73mm.

The screen pipe 6 is located at the lowest end of the composite pipe string, and the depth of the bottom of the screen pipe 6 is 2300m. The screen pipe 6 has a length of 20m. The upper end of the screen pipe 6 is connected with the submersible screw pump 3, and the upper end of the submersible screw pump 3 is connected with the automatic reversing device 2 through two oil pipes 5; the upper end of the automatic reversing device 2 is connected with the gas lift tool 1 through the oil pipe 5, The distance between the gas lift tool 1 and the automatic reversing device 2 is 110m. An oil pipe 5 is connected to the upper end of the gas lift tool 1, and the oil pipe 5 is connected to the wellhead; a cable 4 is lowered through the annular space between the casing and the oil pipe, and the lower end of the cable 4 is connected to the motor of the submersible screw pump 3.

Claims (4)

1. A submersible screw pump gas lift composite pipe string for drainage and gas recovery, including gas lift tool (1), automatic reversing device (2), submersible screw pump (3), downhole cable (4), The screen (6) and the oil pipe (5) are characterized in that: the screen (6) is located at the lowermost end of the composite string, and the upper end of the screen (6) is connected to the submersible screw pump (3), and the submersible screw pump The upper end of (3) is connected to the automatic reversing device (2) through the oil pipe (5), and the upper end of the automatic reversing device (2) is connected to the gas lift tool (1) through the oil pipe (5). The oil pipe (5) is connected to the upper end, and the oil pipe (5) is connected to the wellhead; the cable (4) is lowered through the annular space between the casing and the oil pipe, and the lower end of the cable (4) is connected to the submersible screw pump (3). motor. 2. The gas-lift composite string of the submersible screw pump for drainage and gas production according to claim 1, characterized in that: the oil pipe (5) between the automatic reversing device (2) and the submersible screw pump (3) ) is 1 to 2 pieces. 3. The submersible screw pump gas-lift composite pipe string for drainage and gas recovery according to claim 1, characterized in that: the distance between the gas-lift tool (1) and the automatic reversing device (2) is between 80 and Between 120m. 4. The submersible screw pump gas lift composite pipe string for drainage and gas recovery according to claim 1, characterized in that: the automatic reversing device (2) is an automatic reversing valve or a sliding sleeve, and the gas lift tool (1) is the gas lift mandrel and gas lift valve.

Images