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A kind of water base fracturing fluid and preparation method thereof

A technology of water-based fracturing and gel breaker, applied in the field of fracturing fluid, can solve the problems of gel clogging pores, blocking throats, difficult flowback, etc., to achieve small amount of gel residue, reduce damage, and easy flowback Effect

Active Publication Date: 2016-04-27
BEIJING RECHSAND SCI & TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first technical problem solved by the present invention is the problem that the residual metal ions in the fracturing fluid in the prior art easily form precipitation with sulfate ions or carbonate ions in the formation to block the throat. The second technical problem is that after the fracturing fluid is injected into the formation, it is difficult to break the gel, and it is difficult to flow back, so that the remaining gel blocks the pores, and then provides a water-based fracturing fluid that does not use metal cross-linking agents and is easy to break.

Method used

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  • A kind of water base fracturing fluid and preparation method thereof
  • A kind of water base fracturing fluid and preparation method thereof
  • A kind of water base fracturing fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Measure 500mL of water, add 5g of carboxymethyl cellulose and 2.5g of partially hydrolyzed polyacrylamide (degree of hydrolysis 30%, viscosity average molecular weight 3-12 million), stir to fully dissolve and prepare a jelly.

[0030] (2) Add 10 g of potassium chloride to the jelly formed in step (1), and stir evenly. During the stirring process, the viscosity of the jelly increases gradually.

[0031] (3) Weigh 3g of ammonium persulfate and 2g of citric acid, add them to the jelly formed in step (2), and stir evenly to obtain the required water-based fracturing fluid.

Embodiment 2

[0033] (1) Measure 500mL of water, add 10g of hydroxyethyl cellulose and 2.5g of partially hydrolyzed polyacrylamide (degree of hydrolysis 20%, viscosity average molecular weight 8-12 million), stir well to dissolve and prepare a jelly.

[0034] (2) Add 5g of sodium chloride and 5g of sodium dodecylbenzenesulfonate to the jelly formed in step (1), and stir evenly. During the stirring process, the viscosity of the jelly increases gradually.

[0035] (3) Weigh 2.5g of ammonium persulfate and add it to the jelly formed in step (2), and stir evenly to obtain the required water-based fracturing fluid.

Embodiment 3

[0037] (1) Measure 500mL of water, add 2.5g of carboxymethyl hydroxyethyl cellulose and 2.5g of partially hydrolyzed polyacrylamide (degree of hydrolysis 50%, viscosity-average molecular weight 3-8 million), stir well to dissolve and prepare jelly.

[0038] (2) Add 0.25 g of sodium lauryl sulfate to the jelly formed in step (1), and stir evenly. During the stirring process, the viscosity of the jelly increases gradually.

[0039] (3) Weigh 1.25g of ammonium persulfate and 1.25g of acetic acid into the jelly formed in step (2), and stir evenly to obtain the required water-based fracturing fluid.

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Abstract

The invention provides a water-base fracturing fluid without containing a metallic cross linker and a method for preparing the water-base fracturing fluid. The water-base fracturing fluid comprises the following components: 1-2.5wt% of thickener, 0.5-2wt% of gel breaker and water, wherein the thickener is composed of a cellulose derivative and part of hydrolyzed polyacrylamide, the gel breaker comprises persulfate, and the mass percent regards the water as a standard. A three-dimensional reticular gel structure is formed between the cellulose derivative and the part of hydrolyzed polyacrylamide through the hydrogen-bonding association among molecules without being attached to the metallic cross linker no longer so as to effectively avoid the precipitation of the heavy metal ions in the stratum and reducing the damage to the stratum. Furthermore, in the process of injecting the fracturing fluid into the stratum, the anti-shear ability of the fracturing fluid is further improved and the fracturing fluid gel structure is less destroyed during the transmission process as the hydrogen bond can be reformed after being cut.

Description

technical field [0001] The invention relates to a fracturing fluid, in particular to a water-based fracturing fluid not containing a crosslinking agent, and a preparation method of the water-based fracturing fluid. Background technique [0002] Hydraulic fracturing is an important technical measure for increasing production of oil and gas wells and increasing injection of water wells. When the surface high-pressure pump unit injects high-viscosity liquid into the well at a displacement that greatly exceeds the absorption capacity of the formation, and the pressure near the bottom of the well exceeds the ground pressure near the well wall and the tensile strength of the rock, then a fracture is formed in the formation. As the proppant-laden fluid is injected into the fracture, the fracture gradually propagates forward. In this way, sand-filled fractures that are long enough and have a certain width and height are formed in the formation. Because of its high permeability, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
Inventor 秦升益王中学胡宝苓王光许智超钟毓娟
Owner BEIJING RECHSAND SCI & TECH GRP