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Self-gas-production solid-foam liquor drainage ball of watered gas well

A foam drainage and self-generating technology, which is applied to the direction of production fluid, wellbore/well components, drilling composition, etc., can solve the problems of poor liquid carrying capacity, poor foam stability, weak foaming ability, etc., to achieve Strong oil resistance, stable foam, improved high temperature resistance

Active Publication Date: 2012-03-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, conventional foam liquid drainage agents have problems such as weak foaming ability, small amount of foam, poor liquid carrying ability, poor foam stability, and short half-life in gas wells with high crude oil content.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The liquid-flooded gas well self-generating solid foam drainage ball is prepared in a well whose well temperature is less than 70°C: configure according to the weight of each component.

[0027] Ball A is composed of 138 parts of sodium nitrite and 20 parts of betaine (AC). Sodium nitrite and foaming agent betaine (AC) are compressed to a diameter of about 38mm and a density of about 3.48g / cm 3 solid ball.

[0028] Ball B: 107 parts of ammonium chloride; 5 parts of hydroxyethyl cellulose (HEC); 36 parts of citric acid; 10 parts of ethylenediaminetetraacetic acid. Compress ammonium chloride, foam stabilizer hydroxyethyl cellulose (HEC), catalyst citric acid and ethylenediaminetetraacetic acid into a diameter of 38mm and a density of 3.38g / cm 3 solid ball.

[0029] When in use, the weight ratio of A balls to B balls is 1:1, and the total amount of A balls and B balls added is calculated as 15% of the weight of water contained in the actual gas well effusion. In wells ...

Embodiment 2

[0032] The liquid-flooded gas well self-generating solid foam drainage ball is prepared in a well whose well temperature is less than 70°C: configure according to the weight of each component.

[0033] Ball A: 120 parts of sodium nitrite; 15 parts of betaine (AC).

[0034] Ball B: 100 parts of ammonium chloride; 5 parts of hydroxyethyl cellulose (HEC); 25 parts of citric acid; 5 parts of ethylenediaminetetraacetic acid.

[0035] When in use, the weight ratio of A balls to B balls is 1:1, and the total amount of A balls and B balls added is calculated as 18% of the weight of water contained in the actual gas well effusion. The method of pressing the A ball and the B ball is the same as in Example 1. For wells with pressure but low pressure and low production, alternately open and close the wax removal gate and the main gate of the Christmas tree, and use the space between the wax removal gate and the main gate of the Christmas tree to alternately add A balls and B balls.

[0...

Embodiment 3

[0037] Example 3: Liquid-flooded gas well self-generating solid foam liquid drainage balls, prepared in wells with a well temperature below 70°C: configure according to the weight of each component.

[0038] Ball A: 150 parts of sodium nitrite; 30 parts of betaine (AC).

[0039] Ball B: 120 parts of ammonium chloride; 10 parts of hydroxyethyl cellulose (HEC); 40 parts of citric acid. 10 parts of ethylenediaminetetraacetic acid.

[0040] When in use, the weight ratio of A balls to B balls is 1:1, and the total amount of A balls and B balls added is calculated as 12% of the weight of water contained in the actual gas well effusion. The method of pressing the A ball and the B ball is the same as in Example 1.

[0041] Experiment in the laboratory, add A ball and B ball in 50ml of water in equal amounts, add a total of 12 grams, raise the temperature to 60°C, and react for 6 minutes, then the maximum foam volume can reach 1110ml, the drainage is 41.3ml, and the half-life is 76mi...

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Abstract

The invention relates to a self-gas-production solid-foam liquor drainage ball of a watered gas well, which is applied to the technical field of the foam drainage gas-production technique. The liquor drainage ball mainly consists of a ball A and a ball B and is characterized in that the ball A contains the components by the weight ratio: 100-150 parts of sodium nitrite and 10-30 parts of foaming agent; and the ball B contains the components by the weight ratio: 100-120 parts of ammonium chloride, 5-10 parts of foam stabilizer, 25-40 parts of catalyst and 5-10 parts of ethylene diamine tetraacetic acid (EDTA). The liquor drainage ball has the effects that the foaming capacity is very good, and the liquor in the gas well can produce the over ten times of foam after the liquor drainage ball is put into the well; in addition, the foam is steady, the half-life period is long, and the liquor carrying capacity is very good. Both the ball A and the ball B are non-toxic, and the inertia and non-toxic gas can be produced after reaction. Moreover, the special high-pressure injection equipment is not needed in the process of the oil field operation, therefore, the technique is simple, and theoperation is convenient.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a foam drainage gas recovery technology, in particular to a foam drainage reagent processed into a solid spherical shape and capable of self-gasification. Background technique [0002] At present, foam drainage gas recovery is a commonly used gas recovery method in oilfields. This method is to lift the water in oil and gas wells that are flooded during the gas recovery process of old wells and make gas recovery impossible to the surface through foaming. , and a method of causing water to drain from the well. Most oil and gas field drainage is carried out by foam drainage, and now surfactants are used as foaming agents for drainage, mainly by adding foaming surfactants, such as alkyl (olefin, benzene) sulfonic acid Salts, alkyl (olefin, benzene) sulfates, etc., alkyl phosphates, etc., polyoxyethylene alkylphenol ethers, etc., and synthetic polymers such as p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58E21B43/22
Inventor 朱志宏徐小辉马喜平张传新韩红雁刘利易勇刚哈丽丹
Owner PETROCHINA CO LTD
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