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Foaming agent for efficiently carrying fluid and sand for gas well and preparation method and application of foaming agent

A foaming agent, gas well technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of liquid accumulation, gas well sand production, etc., achieve good thermal stability, low environmental pollution, easy to get effect

Active Publication Date: 2013-02-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to simultaneously solve the problems of sand production and liquid accumulation in gas wells, the purpose of the present invention is to provide a gas well foam discharge agent with high efficiency liquid and sand carrying, which also has the characteristics of strong foaming power, salt resistance, high temperature resistance, etc.

Method used

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  • Foaming agent for efficiently carrying fluid and sand for gas well and preparation method and application of foaming agent
  • Foaming agent for efficiently carrying fluid and sand for gas well and preparation method and application of foaming agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The consumption of each raw material component in the foam discharge agent CQS-1-1 of this embodiment is as follows:

[0024] Cocamidopropyl Betaine 48%, Lauryl Sultaine 12%, Cetyl Dimethyl Alkyl Ammonium Chloride 20%, Water 20%.

[0025] Its preparation method is: slowly pour cocamidopropyl betaine into a blender, and then slowly pour in successively the dodecyl sulfobetaine, hexadecyldimethylalkyl ammonium chloride and water etc. Finally, stir at a constant speed of 150rpm for half an hour.

[0026] The field application method is: the injection rate is 0.3% to 0.8% of the bottom fluid, and the dilution ratio with water is 1:6; for the water production qW3 For gas wells / d, the intermittent drainage method is adopted, and the foam drainage agent is added every 2 to 20 days according to the water output; for the water production qW>30m 3 For gas wells / d, the injection period is 1-2 days, and the balance tank is used for continuous injection.

Embodiment 2

[0028] The consumption of each raw material component in the foam discharge agent CQS-1-2 of this embodiment is as follows:

[0029] Cocamidopropyl Betaine 52%, Lauryl Sultaine 12%, Cetyl Dimethyl Alkyl Ammonium Chloride 16%, Water 20%.

[0030] The preparation method and field application are the same as in Example 1.

Embodiment 3

[0032] The consumption of each raw material component in the foam discharge agent CQS-1-3 of this embodiment is as follows:

[0033] Cocamidopropyl Betaine 60%, Lauryl Sultaine 15%, Cetyl Dimethyl Alkyl Ammonium Chloride 5%, Water 20%.

[0034] The preparation method and field application are the same as in Example 1.

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Abstract

The invention provides a foaming agent for efficiently carrying fluid and sand for a gas well and a preparation method and an application of the foaming agent. The foaming agent comprises the following components by weight percentage: 40-60% of cocamidopropyl betaine, 5-25% of dodecyl sulfobetaine, 5-25% of hexadecyl dimethyl alkyl ammonium chloride and 20% of water. The foaming agent has the following advantages: the foaming agent can be used for carrying the fluid and the sand efficiently, is good in thermostability and low in pungency and can be applied extensively on site, and the raw materials are cheap and easy to obtain.

Description

technical field [0001] The invention relates to a foam-discharging agent for highly efficient liquid-carrying and sand-carrying for gas wells, a preparation method and application. Background technique [0002] The gas reservoirs in the Sebei Gas Field have shallow burial, long gas-bearing well intervals, many gas layers, and complex gas-water distribution. With the strengthening of gas field exploitation, gas field water production has become a key issue restricting the normal production of gas wells. According to statistics, currently 542 production wells in Sebei Gas Field have water production greater than 1.0m 3 There are 122 gas wells per day, and the water-gas ratio of each gas field is increasing year by year. Foam drainage gas recovery technology has achieved good results in the Sebei Gas Field, and there is a large demand for foam drainage agents with excellent liquid-carrying properties. [0003] The lithology of the Sebei gas field is mainly composed of muddy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584E21B43/22
Inventor 刘治坚熊春明李文魁李隽冯胜利王云贾敏李楠廖丽
Owner PETROCHINA CO LTD
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