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A submersible direct drive screw pump huff and puff oil recovery device

A technology of oil production equipment and screw pump, which is applied in the direction of wellbore/well valve device, production fluid, earthwork drilling and production, etc. It can solve the problems of low construction efficiency, high safety and environmental protection risks, and achieve the improvement of repair-free period and low safety and environmental protection risks , The effect of simple operation process

Active Publication Date: 2018-03-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will inevitably determine the need for frequent tripping and tripping during multiple throughput cycles, resulting in low construction efficiency and high safety and environmental risks

Method used

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  • A submersible direct drive screw pump huff and puff oil recovery device
  • A submersible direct drive screw pump huff and puff oil recovery device
  • A submersible direct drive screw pump huff and puff oil recovery device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] see figure 2 and image 3 , the present invention provides a submersible direct drive screw pump huff and puff oil production device, including an automatic downhole water injection switch 6 used to switch between water injection and oil production channels and a submersible direct drive screw pump; wherein the upper end of the downhole automatic water injection switch 6 is liquid Port 9 is connected to oil pipe 4, and its lower end liquid inlet 10 is connected to the oil outlet of the upper end of the submersible direct-drive screw pump through oil pipe 4; said submersible direct-drive screw pump includes a screw pump coaxially connected from top to bottom 7. Flexible shaft 18, upper protector 19, lower protector 20, submersible motor 8 and centralizer 21; the upper end of the screw pump 7 is connected to the lower end of the downhole automatic water injection switch 6; the screw pump 7 and the submersible motor 8 are respectively Electric connection leads to the sub...

Embodiment 2

[0022] On the basis of Embodiment 1, the downhole automatic water injection switch 6 includes four functional components of downhole power supply, control circuit, drive motor and mechanical switch located in its working cylinder 11; Connection, the control circuit is electrically connected with the driving motor; the control circuit mainly controls the rotation direction of the motor to realize the conversion of the "water injection-oil production" process. The downhole power supply adopts high-temperature lithium battery, and the ambient temperature range is -20ºC~+150ºC, which can realize high-current continuous discharge and high-pulse current discharge.

[0023] Such as figure 1 As shown, the mechanical switch includes a bridge channel 12, a lower piston cylinder 13, an upper piston cylinder 14, a piston 15 and a pressure gauge 16, wherein the upper piston cylinder 14 and the lower piston cylinder 13 are located in the working cylinder 11, and the upper piston cylinder 14...

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Abstract

The invention provides a huff-and-puff oil production device with a submersible directly-driven screw pump. The huff-and-puff oil production device comprises an underground automatic water injection switch for realizing water injection and oil production channel switching and a submersible directly-driven screw pump, wherein a liquid outlet in the upper end of the underground automatic water injection switch is connected with an oil pipe, and a liquid inlet in the lower end of the underground automatic water injection switch is connected with an oil outlet in the upper end of the submersible directly-driven screw pump through the oil pipe; the submersible directly-driven screw pump comprises a screw pump, a flexible shaft, an upper protect tor, a lower protector, a submersible motor and a centralizer which are non-coaxially connected from top to bottom; the upper end of the screw pump is connected with the lower end of the underground automatic water injection switch; and the screw pump and the submersible motor are respectively electrically connected to a submersible cable outside a wellhead. The huff-and-puff oil production device is free of repeatedly tripping and has the characteristics of simple and convenient operation flow, high construction efficiency, safety, environment friendliness, low risk and the like; and due to the adoption of the lifting way, the huff-and-puff oil production device has the characteristics of low rotating speed and large torque and is suitable for a well with low liquid quantity, the eccentric wear of pipe poles is eliminated, the maintenance-free period of an oil well is prolonged, and the economic benefit can be effectively increased.

Description

technical field [0001] The invention relates to the technical field of mechanical oil recovery, in particular to a submersible direct drive screw pump huff and puff oil recovery device. Background technique [0002] The water injection huff and puff oil production technology is to inject water into the production well when the formation pressure drops and the production is very low, and then shut down the well for a certain period of time, relying on the self-absorption of capillary force and the replacement of oil in the matrix, and using the pressure drop of the well to make The replacement oil is produced together with part of the injected water, which is an effective method for developing small oil reservoirs without energy supplementation to enhance recovery. So far, this adopted technology has been applied in some domestic oil fields and achieved certain economic benefits, and has the prospect of further popularization and application. Most of the water injection huff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00E21B43/20E21B34/06
CPCE21B34/066E21B43/121E21B43/20
Inventor 刘天宇甘庆明庞洁周志平黄伟李佰涛张磊杨海涛辛宏魏韦呼苏娟
Owner PETROCHINA CO LTD
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