Coal-bed gas well flushing fluid and preparation method and application thereof

A coalbed methane well and flushing fluid technology, which is applied in wellbore/well components, chemical instruments and methods, earthwork drilling and production, etc., can solve the problems of environmental protection pressure, difficulty in degradation, high impurity content, etc., and achieve improved viscosity and shear Strength, improved rheology, good water solubility

Inactive Publication Date: 2021-04-20
王建宇 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] ①The chemicals used in the existing well flushing fluid are artificially synthesized chemicals, which are difficult to degrade under natural environmental conditions, and bring greater environmental protection pressure to the subsequent harmless treatment of drainage wastewater, especially in water resources such as Northwest China and Xinjiang In relatively scarce areas, the pressure on environmental protection is more prominent
On the one hand, the actual use of ionic surfactants is more sensitive to water quality. When the content of calcium, magnesium ions and other impurities in the water is high, it is difficult for the surfactant to fully exert its due effect
The untreated raw well water produced in the formation is mainly used in coalbed methane drainage, and the content of various impurities is relatively high, which makes it difficult to achieve the desired effect in the dispersion and cleaning of coal powder by surfactants
On the other hand, due to the surface activity of the surfactant, the well flushing fluid is prone to foam during use, which affects the pumping efficiency of the drainage pump.
[0006] ③Existing well-flushing fluids are mainly aimed at the dispersion and suspension removal of pulverized coal, especially small-sized pulverized coal (particle size<0.2mm). It is difficult for the well flushing fluid formulated with surfactants to effectively discharge them out of the wellbore

Method used

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  • Coal-bed gas well flushing fluid and preparation method and application thereof
  • Coal-bed gas well flushing fluid and preparation method and application thereof
  • Coal-bed gas well flushing fluid and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Weigh the required raw materials according to the mass ratio of 0.5% sodium alginate, 0.35% gelatin, 0.5% hydroxypropyl starch, 0.3% konjac gum, 0.25% xanthan gum, 0.1% scleroglucan, and 98% tap water, at room temperature Add sodium alginate, gelatin, hydroxypropyl starch, konjac gum, xanthan gum, and scleroglucan into water under certain conditions, and stir until all the added materials are dissolved. The solution obtained is the well-flushing fluid of the present invention.

Embodiment 2

[0049] According to 0.5% sodium alginate, 0.35% gelatin, 0.5% hydroxypropyl starch, 0.3% konjac gum, 0.25% xanthan gum, 0.1% scleroglucan, 98% of the original well produced water of the coalbed methane well in the Baode exploration area Weigh the required raw materials, mix sodium alginate, gelatin, konjac gum, xanthan gum, hydroxypropyl starch, and scleroglucan at room temperature, add them to the original well produced water of the coalbed methane well in the Baode exploration area, and stir The solution obtained until all the added materials are dissolved is the well washing fluid of the present invention.

Embodiment 3

[0051] According to 0.02% sodium alginate, 0.04% gelatin, 0.02% hydroxypropyl starch, 0.01% konjac gum, 0.2% xanthan gum, 0.01% scleroglucan, and 99.7% of the original well produced water of the coalbed methane well in the Baode exploration area Mass ratio Weigh the required raw materials, mix sodium alginate, konjac gum, hydroxypropyl starch, xanthan gum, gelatin, and scleroglucan at room temperature, add them to water, and stir until all the added materials are dissolved. That is the well washing fluid of the present invention.

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Abstract

The embodiment of the invention relates to coal-bed gas well flushing fluid as well as a preparation method and application thereof. The coal-bed gas well flushing fluid comprises one or more of the following core components dissolved in water: sodium alginate, gelatin, hydroxypropyl starch, konjac glucomannan, xanthan gum, scleroglucan and the balance of water. The coal-bed gas well flushing fluid is environmentally friendly and high in universality, has excellent dispersing, suspending and carrying performance on coal-bed gas well products such as pulverized coal, sand and soil, is insensitive to water quality, does not easily generate foam, is wide and easily available in raw material source, and has market competitiveness in cost.

Description

technical field [0001] The invention relates to the technical field of coalbed gas well flushing, in particular to a coalbed gas well flushing fluid and a preparation method and application thereof. Background technique [0002] Coalbed methane is a natural gas resource that is symbiotic and associated with coal. Effective exploitation and utilization of coalbed methane can partially alleviate the contradiction of insufficient supply of oil and natural gas in my country. However, due to the fact that most coal reservoirs are soft, poorly clamped, and coal is easily broken and pulverized, coal powder, sand, and soil are generally produced in the process of coalbed methane extraction. The output of coal powder, sand, and soil etc. are inevitably brought into the wellbore by coalbed methane and formation water. Due to the limited ability of coalbed methane and formation water to disperse, suspend, and carry coal powder, sand, and soil, it is difficult to lift coal powder, sand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52C09K8/528E21B37/00
Inventor 王建宇
Owner 王建宇
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