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Oil production method and device of high oil-gas ratio well

A technology of oil-gas ratio and oil-gas, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as failure to lift out, and achieve the effects of improving pump efficiency, improving liquid extraction efficiency, and wide adaptability

Inactive Publication Date: 2007-02-14
OIL EXTRACTION TECH INST OF SINOPEC SHENGLI OILFIELD
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  • Abstract
  • Description
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Problems solved by technology

However, due to the limitation of the oil well pocket and the depth of the lower pump, the practical application of this method has great limitations. Even if it can be lowered below the oil layer, it still faces the risk that the sand-buried pipe string cannot be pulled out.

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  • Oil production method and device of high oil-gas ratio well
  • Oil production method and device of high oil-gas ratio well
  • Oil production method and device of high oil-gas ratio well

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Embodiment Construction

[0014] A method for recovering oil from a well with a high oil-gas ratio, comprising the steps of: (A) installing a submersible motor 6 and its protector 5 and a submersible centrifugal pump 3 downhole, extracting the downhole oil-gas mixed fluid from the ground, and extracting the downhole oil-gas mixed fluid Going out of the ground also includes the following steps: (B) at least one stage of oil-gas separation device is installed on the upper part of the submersible centrifugal pump, leading the downhole oil-gas mixture to the upper end of the oil-gas separation device, and the oil and gas are separated during this process; (C) dissociating The gas ascends from the oil jacket annulus and is discharged by the casing valve; (D) The degassed fluid enters the upper part of the oil-gas separation device, descends along the double-layer pipe annulus, and is further separated by gravity and rotational centrifugal force in the double-layer annulus, so that Dissolved gas is precipitat...

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Abstract

An oil recovering method of high oil-gas ratio well includes setting oil submersible centrifugal pump and motor in the pit, setting at least one stage of oil-gas separation device on said pump for separating oil from gas, up warding free gas by annulus on oil jacket then venting it out by sleeve valve, entering degasified fluid into double annulus on said separation device to separate dissolved gas out by gravity and rotary centrifugal, down warding degasified fluid into liquid entrance and recovering it up to ground by said pump.

Description

1. Technical field [0001] The invention relates to a method and equipment for lifting oil and gas from a well, in particular to a method and a device for recovering oil from a well with a high oil-gas ratio. 2. Background technology [0002] In the process of mechanical oil recovery in oilfields, the fluid entering the wellbore is mainly two-phase gas and oil or a three-phase mixture of gas, oil and water. Due to the existence of the gas phase, the gas has strong compressibility, which becomes the main factor affecting the lifting efficiency of the oil well pump. Two methods are commonly used to solve the above problems, that is, one is to increase the submergence of the pump; the other is to install a downhole gas separator. Chinese patent 962448664 discloses a "submersible electric pump air anchor device", which is a cylinder structure installed on the electric pump unit, and uses the difference in air density to separate gas and liquid. However, due to the structure, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00
Inventor 王民轩徐建礼张雷刘丙生孙衍东张俊清
Owner OIL EXTRACTION TECH INST OF SINOPEC SHENGLI OILFIELD
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