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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 fracturing fluid, which can solve the problem of poor temperature resistance of the fracturing fluid system in the prior art

Method used

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

Examples

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Embodiment 1

[0027] This embodiment provides an anionic clean fracturing fluid, which is prepared through 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 which is 11;

[0029] Heat the alkali solution to 40-60°C, slowly add 5.0g oleic acid and 5.0g erucic acid in sequence, continue to add a mixture of 0.8g octadecyl dihydroxyethyl betaine and 1.5g cyclohexanol, and stir evenly , add 4.0g butanol under continuous stirring to form a mixed solution;

[0030] The mixed solution was naturally cooled to room temperature, then 8.0 g of potassium chloride was added, and the stirring was continued until a uniform jelly was formed;

[0031] The gel 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 a...

Embodiment 2

[0034] This embodiment provides an anionic clean fracturing fluid, which is prepared through 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 alkali solution to 40-60°C, slowly add 5.0g oleic acid and 7.0g erucic acid in turn, continue to add 1.2g octadecyldimethylsulfopropyl betaine and 2.0g 2-ethylhexanol The mixture was stirred evenly, and 5.0 g of propanol was added under continuous stirring to form a mixed solution;

[0037] The mixed solution was naturally cooled to room temperature, then 10.0 g of potassium chloride was added, and the stirring was continued until a uniform jelly was formed;

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

[0039] The pH value of the fracturing fluid is 12, at 30°C, 170s -1 The viscosity at 219mPa·s; at 150℃, 170s -1 The viscosit...

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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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