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Acid group viscoelastic fluid and preparation method thereof as well as oil and gas reservoir or coal seam treatment method

An oil and gas reservoir and viscoelastic technology, applied in the fields of production fluids, chemical instruments and methods, and earthwork drilling, etc., can solve the problems of no viscosity, hinder surfactants, and cannot carry proppants, and achieve the increase of pores, The effect of increasing permeability and increasing pore structure

Active Publication Date: 2014-05-21
CHINA UNITED COALBED METHANE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in the initial state, the acid prevents the surfactant from forming viscous micelles, so the viscoelastic acid in the initial state has no viscosity and cannot carry the proppant

Method used

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  • Acid group viscoelastic fluid and preparation method thereof as well as oil and gas reservoir or coal seam treatment method
  • Acid group viscoelastic fluid and preparation method thereof as well as oil and gas reservoir or coal seam treatment method
  • Acid group viscoelastic fluid and preparation method thereof as well as oil and gas reservoir or coal seam treatment method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0061] The invention discloses a preparation method of the acid-based viscoelastic fluid described in the above technical scheme, which comprises the following steps:

[0062] Mix the surfactant, organic acid salt and water uniformly to obtain component A;

[0063] Mix formaldehyde, ammonium chloride, organic carboxylate and water uniformly to obtain component B;

[0064] The A component of 5.0wt%-15.0wt%, the component B of 15.0wt%-25.0wt% and the water of 60.0wt%-80.0wt% are uniformly mixed to obtain an acid-based viscoelastic fluid.

[0065] The selection of the raw materials in the A component and the B component is the same as the above technical solution, and will not be repeated here. The present invention does not have any restriction on the device used for mixing, and any device commonly used in the art can be used, such as a stirring pump and a fracturing truck pump.

[0066] Preferably, in the present invention, a proppant can be added when the A component, the B component a...

Embodiment 1

[0096] AI, BI and water are mixed uniformly according to 10.0kg, 20.0kg and 70.0kg to obtain acid-based viscoelastic fluid.

[0097] At 30°C, test the viscosity and pH changes of the acid-based viscoelastic fluid in different time periods, and see the results figure 2 , figure 2 It is the change chart of the viscosity and pH of the viscoelastic fluid obtained in Example 1 at 30°C. figure 2 in, Is the shear rate of 170S -1 The viscosity curve below, It is the pH change curve.

[0098] At 50℃, test the viscosity and pH changes of the acid-based viscoelastic fluid in different time periods, and see the results image 3 , image 3 It is the change chart of the viscosity and pH of the viscoelastic fluid obtained in Example 1 at 50°C. image 3 in, Is the shear rate of 170S -1 The viscosity curve below, It is the pH change curve.

[0099] After heating the obtained acid-based viscoelastic fluid at 50°C, it was evaluated by a dual-core split flow test. The permeability of the high-perm...

Embodiment 2

[0101] Mix AII, BII and water according to the ratio of 5.0kg, 25.0kg and 70.0kg to form an acid-based viscoelastic fluid.

[0102] At 30°C, test the viscosity and pH changes of the acid-based viscoelastic fluid in different time periods, and see the results Figure 5 , Figure 5 It is the change chart of the viscosity and pH of the viscoelastic fluid obtained in Example 2 at 30°C. Figure 5 in, Is the shear rate of 170S -1 The viscosity curve below, It is the pH change curve.

[0103] At 50℃, test the viscosity and pH changes of the obtained viscoelastic fluid in different time periods, see the results Image 6 , Image 6 It is the change chart of the viscosity and pH of the viscoelastic fluid obtained in Example 2 at 50°C. Image 6 in, Is the shear rate of 170S -1 The viscosity curve below, It is the pH change curve.

[0104] After heating the obtained viscoelastic fluid at 50℃, the dual core split flow test was used to evaluate the high permeability core permeability from 25.6×...

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Abstract

The invention provides acid group viscoelastic fluid. The acid group viscoelastic fluid comprises 5.0wt %-15.0wt % of component A, 15.0wt %-25.0wt % of component B and 60.0wt%-80.0wt % of component C, wherein the component A is a viscoelastic surface active agent system which is prepared from a surface active agent, organic acid salt and water, the component B is a self-generation acid system which is prepared from formaldehyde, ammonium chloride, organic carboxylate and water, and the component C is water. The acid group viscoelastic fluid provided by the invention has the characteristics of only having viscoelasticity on ground and having both viscoelasticity and acidity under a formation condition, can carry a propping agent to enter a hydrocarbon reservoir or a coal seam, is capable of improving the filtration capacity of the oil and gas reservoir or the coal seam and is suitable for capacity increasing revamp construction of the oil and gas reservoir or the coal seam.

Description

Technical field [0001] The invention relates to the field of oil and gas reservoirs or coalbed methane exploitation, in particular to an acid-based viscoelastic fluid, a preparation method thereof, and a method for processing oil and gas reservoirs or coal seams. Background technique [0002] Medium and low temperature oil and gas reservoirs or coal seams, that is, oil and gas reservoirs or coal seams with a temperature of 30 to 80°C. In our country, inhomogeneous, low-permeability oil and gas reservoirs or coal beds at medium and low temperatures occupy a large proportion of oil and gas fields or coalbed methane fields. When exploiting such oil and gas reservoirs or coal seams, acidification or fracturing technology is generally used to reform the reservoir to improve the seepage capacity of the reservoir. [0003] The acidification technology uses hydrochloric acid or hydrofluoric acid to inject into the reservoir, which reacts with carbonate, sandstone or clay minerals in the r...

Claims

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Application Information

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IPC IPC(8): C09K8/74E21B43/27
CPCC09K8/74C09K2208/30E21B43/283
Inventor 吴建光冯文光张平杨宇孙晗森张晓朋左景栾
Owner CHINA UNITED COALBED METHANE
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