Pulverized coal stabilizer for coal bed gas reservoir and application method thereof

A stabilizer and coalbed methane technology, which is applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problems of high requirements for use, stratum blockage, short validity period, etc., and achieve good water solubility , good weather resistance, simple on-site construction

Inactive Publication Date: 2015-07-01
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although inorganic salts can temporarily stabilize clay, their validity period is short; inorganic polymers, such as hydroxyaluminum, have a long validity period, but they require higher conditions for use; organic quaternary ammo

Method used

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  • Pulverized coal stabilizer for coal bed gas reservoir and application method thereof
  • Pulverized coal stabilizer for coal bed gas reservoir and application method thereof
  • Pulverized coal stabilizer for coal bed gas reservoir and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A coal powder stabilizer used in coalbed methane reservoirs is prepared according to the following mass percentages: 40% of 2-chloroethyltrimethylammonium chloride, 5% of zirconium oxychloride, 25% of methanol and 30% of water.

[0034] Its preparation method is to directly mix all raw materials in proportion and evenly, and then it can be used directly.

[0035] Its method of use includes the following situations:

[0036] In the pre-fluid stage, the pulverized coal stabilizer is prepared and then pumped into the formation;

[0037] During the fracturing process, the pulverized coal stabilizer is prepared and then pumped into the formation;

[0038] After fracturing, the pulverized coal stabilizer is pumped into the formation as a displacement fluid;

[0039] In the production process, when the wellbore is blocked, the pulverized coal stabilizer is prepared and pumped into the formation.

[0040] The performance test of the pulverized coal stabilizer of the present ...

Embodiment 2

[0050] A coal powder stabilizer for coalbed methane reservoirs, configured according to the following mass percentage: the synthetic product of epichlorohydrin and dimethylamine (synthetic conditions are: epichlorohydrin: dimethylamine is 1:1.2) 35% , zirconium oxychloride 5%, methanol 25%, water 35%.

[0051] The performance test of the pulverized coal stabilizer of the present embodiment is as follows:

[0052] Zeta potential test

[0053] The product of embodiment 2 is added water and is made into the tensio-active agent dilute solution of different concentrations. After the coal sample was taken and pulverized, surfactants of different concentrations were added, stirred at high speed for 30 minutes, and allowed to stand for 24 hours to reach equilibrium, and the Zeta potential was measured. The experimental test temperature was room temperature. as shown in Table 3.

[0054] table 3

[0055] concentration(%) 0 0.25 0.5 0.75 1 2 4 Zeta potential -2...

Embodiment 3

[0062] A coal powder stabilizer for coalbed methane reservoirs is prepared according to the following mass percentages: 30% of octadecyltrimethylammonium bromide, 5% of zirconium hydroxy, 25% of methanol, and 40% of water.

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Abstract

The invention discloses a pulverized coal stabilizer for a coal bed gas reservoir and an application method thereof. The pulverized coal stabilizer disclosed by the invention consists of the following components in percentage by weight: 20-40% of an organic quaternary ammonium surfactant or polyquaternary ammonium surfactant, 1-10% of an inorganic cationic polymer, 5-30% of alcohol and the balance of water. In the backflow stage or drainage stage during and after fracturing construction, a large amount of pulverized coal stabilizer solution can be injected, and cations are adsorbed on the negative-charge coal surface, so that the Zeta potential of the coal rock is increased to about zero, and the repulsive force of the negative charges in the pulverized coal and between the pulverized coal and a coal matrix is reduced to fix the pulverized coal. The pulverized coal stabilizer disclosed by the invention has the characteristics of convenience and easiness to get, no toxicity, convenience in transportation and easiness in field construction; and the applicable temperature is 10-60 DEG C, and the application range is wide.

Description

technical field [0001] The invention relates to the field of development and mining of coal bed gas reservoirs, in particular to a coal powder stabilizer for coal bed gas reservoirs and a use method thereof. Background technique [0002] CBM fracturing is an important link in the mining process of CBM wells. However, unreasonable fracturing technology and flowback measures will cause the migration of coal powder in the coal seam, and form coal powder plugging in natural fractures, artificial fractures and wellbore. Not only does it increase the construction pressure and cause harm to the fracturing equipment, but it also reduces the conductivity of the mesh, making it difficult for the drainage and pressure reduction of the gas well to achieve an ideal state. Therefore, pulverized coal treatment is one of the core issues in the fracturing of coalbed methane wells. [0003] Coal powder can be divided into primary coal powder and secondary coal powder according to the source...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/575E21B43/26
CPCC09K8/5753C09K8/68C09K8/882C09K2208/30E21B43/26
Inventor 杨宇林璠罗陶涛张昊曹煜
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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