high temperature resistant 2 Foam clean associative fracturing fluid and its preparation method and application

A fracturing fluid and association technology, applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc., can solve the problem of difficult control of crosslinking performance stability, unsuitability for medium and high temperature reservoirs, cost and durability It can effectively delay the crosslinking effect, facilitate the preparation, and reduce the viscosity of the base fluid.

Active Publication Date: 2022-08-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Viscoelastic surfactant fracturing fluid is the system used in the early foam fracturing fluid. It has good elasticity and low damage. However, due to the cost and temperature resistance of surfactants, it is not suitable for medium and high temperature reservoirs, so its promotion is limited.
The commonly used guar gum fracturing fluid system is usually an alkaline cross-linking environment, and CO 2 There are compatibility problems in the required acidic environment, and the acidic cross-linking system of guar gum is greatly affected by water, the stability of cross-linking performance is not easy to control, and the sand-carrying performance is poor

Method used

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  • high temperature resistant <sub>2</sub> Foam clean associative fracturing fluid and its preparation method and application
  • high temperature resistant <sub>2</sub> Foam clean associative fracturing fluid and its preparation method and application
  • high temperature resistant <sub>2</sub> Foam clean associative fracturing fluid and its preparation method and application

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Experimental program
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Embodiment 1

[0059] This embodiment provides a fracturing fluid base fluid A, calculated on the basis of the total weight of the fracturing fluid base fluid as 100%, comprising:

[0060] 0.25% thickener;

[0061] 0.5% foaming agent;

[0062] 0.2% crosslinking regulator;

[0063] and the balance of water;

[0064] Wherein, the mass percentage of each monomer component of the thickener: 15% of acrylamide monomer, 4% of N-vinylpyrrolidone, 3% of polydiene dimethyl ammonium chloride, 7% of acrylic acid, persulfuric acid Ammonium is 0.05%, sodium acetate is 0.04%, and the rest is water.

[0065] The preparation method of this thickening agent comprises the following steps:

[0066] The reaction conditions of ternary copolymerization were used to synthesize, and nitrogen was used to remove oxygen. The reaction temperature was 55℃, and the reaction time was 4h. After the reaction is completed, the polymerized product is dried, granulated, and pulverized into a desired mesh to prepare a fract...

Embodiment 2

[0071] The present embodiment provides a fracturing fluid base fluid B, which includes:

[0072] 0.4% thickener;

[0073] 0.5% foaming agent;

[0074] 0.3% crosslinking regulator;

[0075] and the balance of water;

[0076] Wherein, the mass percentage of each monomer component of the thickener: 17% of acrylamide monomer, 3% of N-vinylpyrrolidone, 5% of alkyl methacrylate, 6% of sodium p-styrene sulfonate, Ammonium persulfate is 0.08%, sodium acetate is 0.04%, and the rest is water.

[0077] The preparation method of this thickening agent comprises the following steps:

[0078] The reaction conditions of ternary copolymerization were used to synthesize, and nitrogen was used to remove oxygen. The reaction temperature was 55℃, and the reaction time was 4h. After the reaction is completed, the polymerized product is dried, granulated, and pulverized into a desired mesh to prepare a fracturing fluid thickener. When the concentration of the thickener was 0.4%, the viscosity ...

Embodiment 3

[0082] The present embodiment provides a fracturing fluid base fluid C, which includes:

[0083] 0.6% thickener;

[0084] 0.5% foaming agent;

[0085] 0.5% crosslinking regulator;

[0086] and the balance of water;

[0087] Among them, the mass percentage of each monomer component of the thickener: 21% of acrylamide monomer, 5% of N-tris(hydroxymethyl)methyl-acrylamide, 5% of polydiene dimethyl ammonium chloride, 2-Acrylamido-2-methyl-1-propanesulfonic acid is 7%, potassium thiosulfate is 0.06%, sodium acetate is 0.03%, and the rest is water.

[0088] The preparation method of this thickening agent comprises the following steps:

[0089] The reaction conditions of ternary copolymerization were used to synthesize, and nitrogen was used to remove oxygen. The reaction temperature was 60℃, and the reaction time was 4h. After the reaction is completed, the polymerized product is dried, granulated, and pulverized into a desired mesh to prepare a fracturing fluid thickener.

[...

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Abstract

The invention provides a high temperature resistant CO 2 Foam clean associative fracturing fluid, preparation method and application thereof, comprising fracturing fluid base fluid, cross-linking agent, gel breaker and liquid CO 2 , wherein the cross-linking agent and the gel breaker account for 0.3-0.8% and 0-0.05% of the fracturing fluid base fluid in parts by mass; the liquid CO 2 account for the CO 2 Foam cleans 30-70% of the total volume of the associated fracturing fluid. The high temperature resistant CO provided by the present invention 2 Foam clean associative fracturing fluid has the characteristics of few additives, simple preparation, controllable cross-linking, low residue, low damage, low friction, high foaming efficiency, high flowback rate and high temperature resistance.

Description

technical field [0001] The invention relates to a high temperature resistant CO 2 The invention relates to a foam clean associative fracturing fluid and a preparation method and application thereof, belonging to the technical field of oilfield exploitation. Background technique [0002] Low-permeability unconventional oil and gas reservoirs have the characteristics of strong heterogeneity, low pressure sensitivity, and low elastic energy, and it is difficult to effectively improve their single-well production. Foam fracturing fluid is a kind of liquid CO mixed with conventional fracturing fluid. 2 or N 2 The two-phase air-in-liquid emulsion, the bubbles provide high viscosity and excellent proppant carrying capacity, reducing the amount of fluid entering the well. In the reservoir, as the temperature increases, under the right pressure, liquid CO 2 or N 2 Converted to gaseous state, the foam quality is usually between 65-85%, and the internal phase bubble particles are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C09K8/70E21B43/26C08F271/00C08F220/56C08F226/10C08F220/06C08F220/18C08F212/14C08F220/58
CPCE21B43/26C09K8/685C09K8/703C08F220/56C08F271/00C09K2208/26C08F226/10C08F220/18C08F212/14C08F220/585C08F220/58
Inventor 王丽伟邱晓惠段瑶瑶翟文卢拥军崔伟香明华刘萍刘玉婷梁丽
Owner PETROCHINA CO LTD
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