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High-temperature resistant CO2 foam cleaning and associated fracturing fluid and preparation method and application thereof

A fracturing fluid and CO2 technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problem of difficult control of cross-linking performance stability, unsuitability for medium and high temperature reservoirs, cost and temperature resistance problems and other problems, to achieve a good effect of stable production, increase single well production, and convenient preparation

Active Publication Date: 2017-05-17
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 CO2 foam cleaning and associated fracturing fluid and preparation method and application thereof
  • High-temperature resistant CO2 foam cleaning and associated fracturing fluid and preparation method and application thereof
  • High-temperature resistant CO2 foam cleaning and associated fracturing fluid and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] This embodiment provides a fracturing fluid base fluid A, which includes:

[0060] 0.25% thickener;

[0061] 0.5% foaming agent;

[0062] 0.2% cross-linking modifier;

[0063] and the remainder of the water;

[0064] Wherein, the mass percent 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] It was synthesized under the reaction conditions of ternary copolymerization, nitrogen was passed through to remove oxygen, the reaction temperature was 55° C., and the reaction time was 4 hours. After the reaction, the polymerization product is dried, granulated, and crushed into the required mesh to make a fracturing fluid thickener.

[0067] Based on the calculation that the total mass o...

Embodiment 2

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

[0072] 0.4% thickener;

[0073] 0.5% foaming agent;

[0074] 0.3% cross-linking modifier;

[0075] and the remainder of the water;

[0076] Wherein, the mass percent of each monomer component of the thickener: 17% of acrylamide monomer, 3% of N-vinylpyrrolidone, 5% of alkyl methacrylate, 6% of sodium p-styrenesulfonate, 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] It was synthesized under the reaction conditions of ternary copolymerization, nitrogen was passed through to remove oxygen, the reaction temperature was 55° C., and the reaction time was 4 hours. After the reaction, the polymerization product is dried, granulated, and crushed into the required mesh to make a fracturing fluid thickener. When the concentration of the thickener is 0.4%, the viscosity is 2...

Embodiment 3

[0082] This embodiment provides a fracturing fluid base fluid C, which comprises:

[0083] 0.6% thickener;

[0084] 0.5% foaming agent;

[0085] 0.5% cross-linking modifier;

[0086] and the remainder of the water;

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

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

[0089] It was synthesized under the reaction conditions of ternary copolymerization, nitrogen was passed to remove oxygen, the reaction temperature was 60° C., and the reaction time was 4 hours. After the reaction, the polymerization product is dried, granulated, and crushed into the required mesh to make a fracturing fluid thickener.

[0090] Ass...

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Abstract

The invention provides high-temperature resistant CO2 foam cleaning and associated fracturing fluid and a preparation method and application thereof. The high-temperature resistant CO2 foam cleaning and associated fracturing fluid comprises a fracturing fluid base solution, a cross-linking agent, a gel breaker and liquid CO2, wherein the cross-linking agent and the gel breaker account for 0.3%-0.8% and 0-0.05% of the fracturing fluid base solution in parts by weight separately; and the liquid CO2 accounts for 30%-70% of total volume of the CO2 foam cleaning and associated fracturing fluid. The high-temperature resistant CO2 foam cleaning and associated fracturing fluid provided by the invention has the characteristics of being few in additive types, simple in preparation, controllable in crosslinking, low in residue, low in damage, low in friction, high in foaming efficiency, high in flowback rate and resistant to high temperature.

Description

technical field [0001] The invention relates to a high temperature resistant CO 2 The foam cleaning association fracturing fluid and its preparation method and application belong 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 small elastic energy, so it is difficult to effectively increase their single well production. Foam fracturing fluid is a kind of liquid CO mixed on the basis of conventional fracturing fluid. 2 or N 2 The two-phase gas-in-liquid emulsion, the air bubbles provide high viscosity and excellent proppant carrying capacity, reducing the amount of fluid entering the well. In the reservoir, with increasing temperature, at moderate 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 small, so that sta...

Claims

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Application Information

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Patent Type & Authority Applications(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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