Anionic clean fracturing fluid and preparing method thereof

A clean fracturing fluid, anionic technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor temperature resistance, etc., to achieve the effect of complete gel breaking, high apparent viscosity and good compatibility

Active Publication Date: 2016-03-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide an anionic clean fracturin

Method used

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  • Anionic clean fracturing fluid and preparing method thereof
  • Anionic clean fracturing fluid and preparing method thereof

Examples

Experimental program
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Example Embodiment

[0026] Example 1

[0027] This embodiment provides an anionic clean fracturing fluid, which is prepared by the following steps:

[0028] Prepare 200 mL of an aqueous solution containing 0.8 wt% potassium hydroxide at room temperature to obtain an alkaline solution, the pH of the alkaline solution is 11;

[0029] Heat the alkali solution to 40-60°C, slowly add 5.0g oleic acid and 5.0g erucic acid successively, continue to add 0.8g octadecyldihydroxyethyl betaine and 1.5g cyclohexanol mixture, stir well , Add 4.0g butanol under continuous stirring to form a mixed solution;

[0030] Cool the mixture naturally to room temperature, then add 8.0 g of potassium chloride, and continue to stir until a uniform jelly is formed;

[0031] The jelly is aged at room temperature for 10-24 hours to form an anionic clean fracturing fluid.

[0032] The fracturing fluid in 170s -1 The viscosity-temperature curve under figure 1 As shown, at 150℃, 170s -1 The temperature resistance and shear resistance chara...

Example Embodiment

[0033] Example 2

[0034] This embodiment provides an anionic clean fracturing fluid, which is prepared by the following steps:

[0035] Prepare 200 mL of an aqueous solution containing 1.2 wt% potassium hydroxide at room temperature to obtain an alkaline solution, the pH of which is 13;

[0036] Heat the alkaline solution, raise the temperature to 40-60°C, slowly add 5.0g oleic acid and 7.0g erucic acid successively, continue to add 1.2g octadecyldimethylsulfopropyl betaine and 2.0g 2-ethylhexanol Mix the mixture evenly, add 5.0g propanol under continuous stirring to form a mixed solution;

[0037] Cool the mixture naturally to room temperature, then add 10.0 g of potassium chloride, and continue to stir until a uniform jelly is formed;

[0038] The jelly is aged at room temperature for 10-24 hours to form an anionic clean fracturing fluid.

[0039] The pH of the fracturing fluid is 12, at 30℃, 170s -1 The viscosity is 219mPa·s; at 150℃, 170s -1 The lower viscosity is 51.7mPa·s; the fr...

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Abstract

The invention provides anionic clean fracturing fluid and a preparing method thereof. The anionic clean fracturing fluid is prepared from, by weight, 1-3.5% of oleic acid, 1-3.5% of erucic acid, 1-2% of auxiliaries, 0.6-1.3% of potassium hydroxide, 2-5% of cosolvent, 3-7% of potassium chloride and the balance water. The anionic clean fracturing fluid can resist medium and high temperature, gel breaking can be achieved completely, no residue is left basically, apparent viscosity is quite high, sand carrying is achieved, the anionic clean fracturing fluid belongs to clean fracturing fluid and is highly compatible with stratums, and the requirement of an oil and gas field site for fracturing fluid is met.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and relates to a surfactant fracturing fluid for oilfield fracturing, in particular to an anionic clean fracturing fluid. Background technique [0002] Viscoelastic surfactant fracturing fluids have many advantages over conventional polymer systems. Generally, the molecular weight of surfactants mostly does not exceed 1000, which is only one millionth of that of polymers. It is a small molecule without solid phase and residue, and will not cause great damage to the formation like polymers, and is environmentally friendly. Fracturing fluid. In addition, as long as the surfactant fracturing fluid comes into contact with formation water, crude oil or natural gas in the fracture, it will break the gel by itself, no need to add a gel breaker, and the surfactant after the gel is broken is still active and has the function of helping drainage . [0003] At present, the surfactant fract...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/68C09K2208/30
Inventor 郭琳刘强李军李霞李玉印包放苏建
Owner PETROCHINA CO LTD
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