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Pipe column for oil well downhole gas collecting multiphase pumping process

A process string and gas gathering technology, applied in wellbore/well components, production fluids, earth-moving drilling, etc., can solve the problems of difficult maintenance, restricted wellhead back pressure of the constant pressure casing gas valve, and high investment costs, and achieves The effect of reducing environmental pollution and safety hazards and eliminating emissions

Pending Publication Date: 2017-05-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problems that the existing constant pressure sleeve gas valve is limited by the back pressure of the wellhead, some wells cannot be effectively recovered; the investment cost of compressor pressurized recovery is high, and maintenance is difficult. The present invention provides an oil well downhole gas collection and mixed extraction process string , the present invention eliminates casing gas discharge and reduces environmental pollution and potential safety hazards by controlling and collecting crude oil associated gas from downhole

Method used

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  • Pipe column for oil well downhole gas collecting multiphase pumping process

Examples

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Effect test

Embodiment 1

[0019] In order to overcome the problems that the existing constant pressure sleeve gas valve is limited by the back pressure of the wellhead, some wells cannot be effectively recovered; the investment cost of compressor pressurized recovery is high, and the maintenance is difficult. The present invention provides such as figure 1 Shown is an oil well downhole gas collection and mixed pumping process string. The invention controls and collects crude oil associated gas from downhole, eliminates casing gas discharge, and reduces environmental pollution and safety hazards.

[0020] An oil well downhole gas collection and mixed pumping process string, comprising a casing 13, an upper oil pipe 2 and a lower oil pipe 11, the upper oil pipe 2 and the lower oil pipe 11 are located in the casing 13, the upper oil pipe 2 and the lower oil pipe 11 The oil-gas mixing pump 3, the drainer 4, the oil-gas separation string 12 and the packer 8 are sequentially connected from top to bottom, and ...

Embodiment 2

[0025] Based on the above embodiments, in this embodiment, the oil-gas separation string 12 includes an oil-gas separation string outer tube 6 and an oil-gas separation string inner tube 7, and the upper end of the oil-gas separation string outer tube 6 is connected to the drain The oiler 4 is connected, and the lower end of the outer tube 6 of the oil-gas separation string is suspended;

[0026] The fluid in the oil layer passes through the inner tube 7 of the oil-gas separation string and the outer tube 6 of the oil-gas separation string to communicate with the annulus of the upper casing 13 in a circuitous manner. The path for establishing the dynamic liquid level in the 13 annulus is tortuous, so the air pressure of the casing 13, the liquid column in the annulus of the casing 13, the density of the liquid column in the annulus of the oil-gas separation string 12, and the dissolved gas ratio can easily reach an approximate equilibrium. Then the gas is released.

[0027] A...

Embodiment 3

[0032] Based on the above-mentioned embodiments, in this embodiment, the lower oil pipe 11 is provided with an eye tube 9 , and the eye tube 9 is located between the packer 8 and the plug 10 .

[0033] The eye tube 9 is provided with a plurality of through holes.

[0034] The upper end of the upper oil pipe 2 is connected with a lifting nipple 1 , and the lifting nipple 1 is located in the casing 13 .

[0035] The upper end of the lifting nipple 1 of the pipe string in this process is threaded to the wellhead of the oil production well, the lower end is threaded to the oil pipe 2, the lower end of the oil pipe 2 is threaded to the oil-gas mixed pump 3, and the lower end of the oil-gas mixed pump 3 is threaded to the oil drain 4, the oil drain 4 The lower end of the fixed valve 5 is threaded to the fixed valve 5, the lower end of the fixed valve 5 is threaded to the outer pipe 6 of the oil-gas separation string, the lower end of the inner pipe 7 of the oil-gas separation string...

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Abstract

The invention provides a pipe column for an oil well downhole gas collecting multiphase pumping process. The pipe column comprises a sleeve, an upper oil pipe and a lower oil pipe. The upper oil pipe and the lower oil pipe are located in the sleeve. An oil gas multiphase-pumping pump, an oil draining device, an oil gas separating pipe column and a packer are connected in sequence from top to bottom between the upper oil pipe and the lower oil pipe. A plug is arranged at the lower end of the lower oil pipe. The packer on the lower portion of the process pipe column is used for separating an oil layer and a dynamic liquid level on the upper portion, by combining the oil gas separating pipe column, a circuitous liquid path is built, and the dynamic liquid level is built, so that gas is prevented from being discharged from an oil sleeve annulus. The oil gas multiphase pumping-pump on the upper portion of the pipe column extracts associated gas and crude oil in an oil gas multiphase state, so that the function of collecting the associated gas from downhole is achieved, emission is removed, and environmental pollution and potential safety hazards are reduced.

Description

technical field [0001] The invention relates to an oil well downhole gas collection and mixed pumping process string. Background technique [0002] At present, the recovery of associated gas in domestic oilfields is carried out through wellhead casing, mainly using technologies such as constant pressure sleeve gas valve and compressor pressurized recovery. The constant pressure sleeve gas valve is limited by the back pressure of the wellhead, and some wells cannot be recovered effectively; the investment cost of compressor pressurized recovery is high, and maintenance is difficult. At present, there is no effective and mature technology and experience for downhole control and collection of crude oil associated gas in China. Contents of the invention [0003] In order to overcome the problems that the existing constant pressure sleeve gas valve is limited by the back pressure of the wellhead, some wells cannot be effectively recovered; the investment cost of compressor pre...

Claims

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Application Information

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IPC IPC(8): E21B43/12E21B43/38
CPCE21B43/121E21B43/38
Inventor 覃川薛建强王林平郑刚魏立军程颢晏耿成张倩王曼杨会丰冯建设刘一山
Owner PETROCHINA CO LTD