Guar gum clean fracturing fluid for oil well and preparation method thereof

A technology for cleaning fracturing fluid and guar gum, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as thermodynamic instability, chemical incompatibility, production of a large number of packaging barrels, and reduction of permeability, etc., to achieve Reduce water lock effect, reduce transportation and packaging, and reduce reservoir damage

Inactive Publication Date: 2020-08-25
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

[0003] ① There are many kinds of supporting additives, such as drainage aids, clay stabilizers, bactericides, and demulsifiers, which often have compatibility problems with various products. After the construction is completed, a large number of packaging barrels will be produced, causing certain pollution to the environment
[0004] ② Ammonium persulfate is commonly used as a gel breaker, and the sulfate formed after the gel breaks is easy to form permanent precipitation with barium and strontium in the formation, blocking the pores and throats, preventing the outflow of oil flow, and reducing the permeability
[0005] ③Conventional fracturing fluid water and formation water both contain different scaling ions. Due to the thermodynamic instability and chemical incompatibility of water, unstable and easy-to-precipitate substances will be produced after the scaling ions interact, and As a result, equipment corrosion and serious scaling and clogging of formations are caused

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A guar clean fracturing fluid for oil wells, comprising the following formula in mass percentage: 0.25% hydroxypropyl guar gum, 0.25% multi-effect fracturing aid, 0.015% chelating agent, 0.2% cross-linking agent, 0.01% % breaker, 99.275% water. Its preparation method is as follows: add water to a mixer with a capacity of 2000mL, turn on the mixer, use a voltage regulating transformer to control the voltage at 50V, first add a chelating agent and a multi-effect fracturing aid, and then slowly add hydroxypropyl guar glue and stir for 30 minutes to make a homogeneous solution. The solution was poured into a 1000ml wide-mouth bottle and placed in a 30°C constant temperature water bath for hydration and expansion for 4h. Take the above-mentioned base solution, add a low amount of guar gum polynuclear cross-linking agent, and make it into a jelly that can be hung by a glass rod. A breaker was added to the prepared jelly, stirred evenly, and kept at a constant temperature in...

Embodiment 2

[0034] 0.26% hydroxypropyl guar gum, 0.30% multi-effect fracturing aid, 0.025% chelating agent, 0.22% crosslinking agent, 0.5% breaker, 98.695% water. Its preparation method is as follows: add water to a mixer with a capacity of 2000mL, turn on the mixer, use a voltage regulating transformer to control the voltage at 50V, first add a chelating agent and a multi-effect fracturing aid, and then slowly add hydroxypropyl guar glue and stir for 30 minutes to make a homogeneous solution. The solution was poured into a 1000ml wide-mouth bottle and placed in a 30°C constant temperature water bath for hydration and expansion for 4h. Take the above-mentioned base solution, add a low amount of guar gum polynuclear cross-linking agent, and make it into a jelly that can be hung by a glass rod. A breaker was added to the prepared jelly, stirred evenly, and kept at a constant temperature in a 30°C water bath. After 2 hours, the jelly was completely hydrated, and the viscosity of the breakin...

Embodiment 3

[0041] 0.275% hydroxypropyl guar gum, 0.35% multi-effect fracturing aid, 0.03% chelating agent, 0.3% crosslinking agent, 1% breaker, 98.045% water. Its preparation method is as follows: add water to a mixer with a capacity of 2000mL, turn on the mixer, use a voltage regulating transformer to control the voltage at 50V, first add a chelating agent and a multi-effect fracturing aid, and then slowly add hydroxypropyl guar glue and stir for 30 minutes to make a homogeneous solution. The solution was poured into a 1000ml wide-mouth bottle and placed in a 30°C constant temperature water bath for hydration and expansion for 4h. Take the above-mentioned base solution, add a low amount of guar gum polynuclear cross-linking agent, and make it into a jelly that can be hung by a glass rod. A breaker was added to the prepared jelly, stirred evenly, and kept at a constant temperature in a 30°C water bath. After 2 hours, the jelly was completely hydrated, and the viscosity of the breaking l...

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Abstract

The invention relates to guar gum clean fracturing fluid for an oil well and a preparation method of the guar gum clean fracturing fluid. The guar gum clean fracturing fluid is composed of the following components in percentage by mass: 0.25 to 0.28% of hydroxypropyl guar gum; 0.25 to 0.40% of multi-effect fracturing auxiliary agent; 0.015 to 0.04% of chelating agent; 0.20 to 0.35% of cross-linking agent; 0.01 to 3% of gel breaker; and the balance being water. The selected multi-effect fracturing additive has good foaming capacity and is beneficial to flowback, meanwhile, a water locking effect can be reduced through low surface and interface tension, reservoir clay expansion can be prevented, multiple effects can be realized with such an agent is achieved, the overall performance of the fracturing fluid is improved, and operation is easy. The chelating agent improves the compatibility of the fracturing fluid and formation water; and the gel breaker can solve the problem of corrosion of ammonium persulfate to equipment. The guar gum clean fracturing fluid system is low in use concentration and good in temperature resistance and shearing resistance, and has the advantages of low residue, small damage to a reservoir stratum, and bright application and popularization prospect.

Description

technical field [0001] The invention relates to a guar clean fracturing fluid for oil wells, belonging to the field of oilfield chemical fracturing fluids. Background technique [0002] Fracturing fluid is a key formulation to ensure successful fracturing and enhance oil recovery. At present, water-based fracturing fluids are basically used in the fracturing construction of domestic oil fields, mainly based on guar gum and its derivatives, adding a variety of additives, and combining with cross-linking agents and gel breakers. This fracturing fluid has the advantages of wide application range and good comprehensive performance. But like many other water-based fracturing fluids, it also has certain deficiencies, which are mainly manifested in: [0003] ① There are many types of supporting additives. There are often compatibility problems with various products in drainage aids, clay stabilizers, fungicides and demulsifiers. After the construction is completed, a large number...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/88C09K8/90
CPCC09K8/685C09K8/887C09K8/905C09K2208/24
Inventor 王佳李俊华谢元沈燕宾许磊路建萍周渝李辰
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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