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Low concentration guanidine gum fracturing fluid for gas well

A guar gum fracturing fluid and low-concentration technology, applied in the field of guar gum fracturing fluid, can solve the problems of wide-spectrum drug resistance, unreasonable addition of gel breaker, and high concentration of thickening agent, etc., and achieve a solution Drug resistance, low cost, and obvious economic benefits

Inactive Publication Date: 2017-12-26
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic gas well fracturing construction basically uses water-based fracturing fluid, which is mainly composed of guar gum and its derivatives, and is formed by adding a variety of additives, bactericides, and combined with cross-linking agents and gel breakers. Although this fracturing fluid has many advantages such as good shear resistance, good thermal stability, and strong fluid loss control ability, it also has certain shortcomings like many other water-based fracturing fluids. The main manifestations are: ①The concentration of the thickener in the fracturing fluid is high, and the dosage of the gel breaker is unreasonable, which seriously affects the gel breaking; ②There are many residues after fracturing, which has caused certain damage to the reservoir; ③Bacteria are sterilized in the fracturing fluid 1227, glutaraldehyde, isothiazolinone, etc. are used as agents, which are prone to drug resistance and insufficient broad-spectrum in use; ④ With the straight-line increase in the price of guar gum in 2012, and the single supply channel, the fracturing construction has caused high cost and supply instability

Method used

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  • Low concentration guanidine gum fracturing fluid for gas well
  • Low concentration guanidine gum fracturing fluid for gas well
  • Low concentration guanidine gum fracturing fluid for gas well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 986.5mL of water to the 2000mL mixer, turn on the mixer, use a voltage regulating transformer to control the voltage at 50V, and first add 0.5g of the fungicide (specifically, the application number is 201610606565.3 in the example fungicide sample 1 in the specification text) Recorded substance), then slowly add 3.5g of hydroxypropyl guar gum, stir for 30 minutes to make it become a uniform solution, pour the solution into a 1000ml jar, and place it in a constant temperature water bath at 30℃ to hydrate and swell for 4 hours; then Add the regulator 1.0g sodium carbonate, and at the same time add 0.3g temperature stabilizer (specifically, the substance described in Example 2 in the specification text of the application number 201610939583.3), 5g anti-swelling stabilizer (composition: polymethacryloxyethyl) Trimethyl ammonium chloride 40%, ammonium chloride 10%, octadecyl trimethyl ammonium chloride 5% and water 45%, preparation method: add water and polymethpropylene ...

Embodiment 2

[0025] Add 986.2mL of water to the 2000mL mixer, turn on the mixer, use a voltage-regulating transformer to control the voltage at 55V, and first add 0.5g of the fungicide (specifically, the application number is 201610606565.3 in the example fungicide sample 3 in the specification text) Recorded substance), then slowly add 2.8g of hydroxypropyl guar gum, stir for 30 minutes to make it a uniform solution, pour the solution into a 1000ml jar, and place it in a 30℃ constant temperature water bath to hydrate and swell for 4h; then Adding regulator 2.0g sodium bicarbonate, at the same time adding 0.3g temperature stabilizer (specifically the substance described in Example 2 in the specification text of the application number 201610939583.3), 5g anti-swelling stabilizer (composition: polymethacryloxy ethylene) Trimethylammonium chloride 40%, ammonium chloride 10%, octadecyltrimethylammonium chloride 5% and water 45%. Preparation method: Add water and polymethyl ammonium chloride into...

Embodiment 3

[0028] Add 983mL of water to the mixer with a capacity of 2000mL, turn on the mixer, use a voltage-regulating transformer to control the voltage at 50V, and first add 1.0g of the fungicide (specifically, the application number is 201610606565.3 in the example fungicide sample 2 in the specification text) Substances), then slowly add 3.0g of hydroxypropyl guar gum, stir for 30 minutes to make it a homogeneous solution, pour the solution into a 1000ml jar, and place it in a 30℃ constant temperature water bath to hydrate and swell for 4h; then add 2.0g sodium bicarbonate, 0.8g temperature stabilizer (specifically, the substance described in Example 2 in the specification text of the application number 201610939583.3), 7g anti-swelling stabilizer (composition: polymethacryloxyethyl trimethyl) 40% ammonium chloride, 10% ammonium chloride, 5% octadecyl trimethyl ammonium chloride and 45% water. Preparation method: Add water and polymethacryloxy in a stirred reactor After mixing ethyl...

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Abstract

The invention relates to a low concentration guanidine gum fracturing fluid for gas well. The fracturing fluid is composed of hydroxypropyl guar gum, an anti-swelling stabilizer, a bactericide, a foaming cleanup additive, a conditioning agent, a temperature stabilizing agent, a chelating agent, a crosslinking agent, a gel breaker, and water. The provided fracturing fluid overcomes the shortages of a conventional fracturing fluid for gas well such as a large using amount of thickening agent, a large amount of residues after gel breaking, and the like. The preparation cost is low. The performance on resisting temperature and shearing is good. The using concentration of guanidine gum is greatly reduced. The damage on stratum is obviously reduced. Prominent economic benefit is created, and the application prospect is wide.

Description

Technical field [0001] The invention belongs to the technical field of preparation of petrochemical products, and relates to a guar gum fracturing fluid used for gas wells. Background technique [0002] Fracturing fluid is the liquid used in the fracturing measures of oil and gas wells with the use of liquid conduction force. Its performance directly affects the success or failure of fracturing construction and will have a great impact on the effect of reservoir reconstruction. At present, the domestic gas well fracturing construction basically uses water-based fracturing fluid, which is mainly formed by guar gum and its derivatives, and is formed by adding a variety of additives, fungicides, and combining crosslinking agents and gel breakers. Although this fracturing fluid has many advantages such as good shear resistance, good thermal stability, and strong fluid loss control ability, it also has certain shortcomings like many other water-based fracturing fluids. Mainly manifes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/90
CPCC09K8/685C09K8/90C09K2208/12C09K2208/26
Inventor 王佳李俊华周渝谢元李辰沈燕宾路建萍李轶司伟
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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