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Liquid drainage system

A technology for draining and producing oil pipes, which is applied in the fields of production fluids, wellbore/well components, and earth-moving drilling, etc., can solve the problems of poor economic benefits, high mining difficulty, low productivity, etc., and achieves simple connection structure, liquid draining Good effect and strong practical effect

Inactive Publication Date: 2014-01-22
SHAANXI HI TECH ENERGY DEV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] Low-permeability oil and gas fields have the characteristics of complex geological conditions, difficult exploitation, low production capacity and poor economic benefits.

Method used

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  • Liquid drainage system

Examples

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Embodiment Construction

[0008] The drainage system of the present invention includes a production tubing 1 and a coiled tubing 2. The production tubing 1 is wrapped around the coiled tubing 2, and the top of the production tubing 1 is connected to a valve and an oil storage tank 3 in turn. The oil storage tank 3 A drain pipe is provided, a nitrogen recovery device is provided in the oil storage tank 3, and the top of the coiled tubing 2 is connected with a gas injection pump and a nitrogen tank 4. When working, lower the coiled tubing 2 to below the static liquid level in the well, turn on the gas injection pump 5, and inject nitrogen from the nitrogen tank 4 to the liquid surface. The nitrogen rises from the annulus of the production tubing 1 in the well, driving the liquid to overcome friction pressure and static liquid. The column pressure quickly rises to the well head, enters the oil storage tank 3, and separates the nitrogen from the liquid through the nitrogen recovery device in the oil storage ...

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Abstract

The invention relates to an oil well oil pumping system, in particular to a liquid drainage system which comprises production tubing and coiled tubing. The production tubing wraps the coiled tubing, the top portion of the production tubing is connected with a valve and an oil reservoir in sequence, a liquid drainage pipe is arranged on the oil reservoir, a nitrogen recycling device is arranged in the oil reservoir, and the top portion of the coiled tubing is connected with an injection pump and a nitrogen tank. The liquid drainage system is simple in connection structure, good in liquid drainage effect and strong in practicability.

Description

Technical field [0001] The invention relates to an oil well pumping system. Background technique [0002] Low-permeability oil and gas fields are characterized by complex geological conditions, difficult mining, low productivity, and poor economic benefits. Russia’s hard-to-explore oil reserves account for more than 40% of the remaining recoverable reserves, and most of these oil mines are low-permeability oil and gas fields. In recent years, my country’s low-permeability oil and gas production capacity has accounted for more than 70% of the total, and has become the main battlefield for oil and gas development and construction. In 2008 alone, low-permeability crude oil production accounted for 37.6% of total production, and low-permeability natural gas production accounted for 42.1% of the total production. After the low-permeability oil layer breaks into water, the fluid and oil production index drops sharply, which has a sharp impact on the stable production of the oilfield. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00
Inventor 张淑芬
Owner SHAANXI HI TECH ENERGY DEV
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