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A nitrogen foam fracturing fluid system suitable for low-pressure water-poor coalbed methane wells

A nitrogen foam, coalbed methane well technology, which is applied in the directions of production fluids, wellbore/well components, drilling compositions, etc., can solve problems such as coal seam adsorption damage, and achieve the effects of reducing adsorption damage, simple formula and increasing production.

Active Publication Date: 2020-10-16
BEIJING JIUZUN ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to increase the foam stabilization time in the conventional foam fracturing fluid, a macromolecular foam stabilizer is added, which will cause great adsorption damage to the coal seam

Method used

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  • A nitrogen foam fracturing fluid system suitable for low-pressure water-poor coalbed methane wells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A foam fracturing fluid system suitable for low-pressure water-poor coalbed methane wells, consisting of 2.0% anti-swelling agent + 0.3% composite foaming agent + clear water. The anti-swelling agent is potassium chloride, and the composite foaming agent is a compound of alkylphenol polyoxyethylene ether OP-10, alkyl polyglycoside APG, and cetyl alcohol in a mass ratio of 1:1.5:0.7.

[0033] The preparation method is as follows: adding 2.0% anti-swelling agent into clear water, mixing evenly, then adding 0.3% composite foaming agent, stirring evenly to form foam fracturing fluid.

[0034] The experimental results show that the foam volume is 480ml, the foam quality is 79.2%, and the foam half-life is 3100s.

Embodiment 2

[0036] A foam fracturing fluid system suitable for low-pressure water-poor coalbed methane wells, consisting of 2.0% anti-swelling agent + 0.3% composite foaming agent + clear water. The anti-swelling agent is potassium chloride, and the composite foaming agent is a compound of alkylphenol polyoxyethylene ether OP-10, alkyl polyglycoside APG, and cetyl alcohol in a mass ratio of 1:1.2:1.2.

[0037] The preparation method is as follows: adding 2.0% anti-swelling agent into clear water, mixing evenly, then adding 0.3% composite foaming agent, stirring evenly to form foam fracturing fluid.

[0038] The experimental results show that the foam volume is 470ml, the foam quality is 78.0%, and the foam half-life is 3600s.

Embodiment 3

[0040] A foam fracturing fluid system suitable for low-pressure water-poor coalbed methane wells consists of 1.0% anti-swelling agent + 0.4% composite foaming agent + clear water. The anti-swelling agent is potassium chloride, and the compound foaming agent is a compound of alkyl glucosamide APA, Tween-60, and cetyl alcohol in a mass ratio of 1.0:2.0:1.0.

[0041] Add 1.0% anti-swelling agent to clean water, mix well, then add 0.4% composite foaming agent, stir well to form foam fracturing fluid.

[0042] The experimental results show that the foam volume is 460ml, the foam quality is 78.3%, and the foam half-life is 3800s.

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Abstract

The invention relates to a nitrogen foam fracturing fluid system suitable for a low-pressure water-containing coal-bed gas well. The system is prepared from the following raw materials in percentage by weight: 1.0 to 2.0 percent of anti-swelling agent, 0.2 to 0.5 percent of foaming agent and 97.5 to 98.8 percent of water. In the fracturing fluid system, the foam volume is 400 to 480 ml, the half-life period of the foam is 2500 to 4000 s; furthermore, the fracturing liquid system does not contain a macromolecular polymer, is quick in flowback, small in liquid use amount, low in injury, simple in formula and low in cost; and moreover, in the nitrogen fracturing process, methane partial pressure can be reduced, rapid desorption of coal-bed gas is benefited and the yield is increased.

Description

technical field [0001] The invention belongs to the field of unconventional natural gas development, and relates to a nitrogen foam fracturing fluid system, in particular to a nitrogen foam fracturing fluid system suitable for low-pressure, water-poor coal seam gas wells. Background technique [0002] The accumulation mechanism of coalbed methane is complex, and the reservoir matrix has obvious characteristics of low porosity, low permeability, and low gas saturation; Young's modulus is small, Poisson's ratio is large, and deformation is easy to occur; coal seam joints and micro-fractures are well developed; coal seam It has strong adsorption capacity and is extremely vulnerable to damage. These characteristics of the coal seam make the coal seam extremely easy to absorb foreign fluids, causing the clogging of the coal seam voids and the expansion of the matrix, thus affecting the production of coalbed methane. [0003] At present, the most widely used active water fracturi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/70C09K8/68E21B43/26
CPCC09K8/602C09K8/604C09K8/68C09K8/703C09K8/885E21B43/26
Inventor 孙良田韩志强杜良军王一兵李兆彬贾佳妮邢小松
Owner BEIJING JIUZUN ENERGY TECH