Preparation and application of anionic clean fracturing liquid and gel breaker thereof

A technology for cleaning fracturing fluids and anions, which can be used in drilling compositions, production fluids, boreholes/well components, etc., and can solve the problem of high cost of zwitterionic surfactants, increased resistance to oil and gas flow, and difficulty in large-scale promotion and use and other problems, to achieve the effect of good sand carrying performance, high safety, and satisfying large-scale promotion and use

Inactive Publication Date: 2017-04-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, clean fracturing fluids mainly use cationic quaternary ammonium salt surfactants and zwitterionic surfactants as fracturing fluid thickeners, such as CTAB (cetyltrimethylammonium bromide), betaine, etc., usually on the surface Cationic active agents will face two problems: first, cationic quaternary ammonium salt surfactants are strongly irritating and will cause certain harm to water bodies; Adsorption occurs, causing surface wettability changes and pore throat size reduction, reducing formation permeability, increasing oil and gas flow resistance, and may cause adsorption damage
However, the cost of zwitterionic surfactants is too high to be widely used

Method used

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  • Preparation and application of anionic clean fracturing liquid and gel breaker thereof
  • Preparation and application of anionic clean fracturing liquid and gel breaker thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Dissolve 15g of sodium lauryl polyoxyethyl ether sulfate in 437g of water as liquid A, dissolve 110g of sodium chloride in 437g of water as liquid B, add liquid A into liquid B and stir fully to obtain a viscoelastic fluid and stir until uniform, forming The clear and translucent anion cleaning fracturing fluid of the present invention has a certain viscosity.

[0039] After the fracturing is completed, weigh 2 g of sodium dimethylbenzene sulfonate, and add the weighed sodium dimethylbenzene sulfonate into water of the same volume as the proppant used in the actual site to form a clear and transparent gel breaker.

[0040] During fracturing, the pre-fluid, sand-carrying fluid, and displacement fluid are injected in sequence, and the clean fracturing fluid of the present invention is used for the pre-fluid, sand-carrying fluid, and displacement fluid. The rheological curve of the viscoelastic fluid after adding the breaker is as follows figure 1 shown.

Embodiment 2

[0042] Dissolve 15g of sodium lauryl polyoxyethyl ether sulfate in 457g of water as liquid A, dissolve 70g of potassium chloride in 457g of water as liquid A, add liquid A into liquid B and stir fully to obtain a viscoelastic fluid and stir until uniform, forming The clear and translucent anion cleaning fracturing fluid of the present invention has a certain viscosity.

[0043]After the fracturing is completed, weigh 1g of cetyltrimethylammonium bromide, and add the weighed cetyltrimethylammonium bromide into water with the same volume as the proppant used in the actual site to form a clarified Transparent breaker. During fracturing, the pre-fluid, sand-carrying fluid, and displacement fluid are injected in sequence, and the clean fracturing fluid of the present invention is used for the pre-fluid, sand-carrying fluid, and displacement fluid. The rheological curve of the viscoelastic fluid after adding the breaker is as follows figure 1 shown.

Embodiment 3

[0045] Dissolve 15 g of sodium lauryl polyoxyethyl ether sulfate in 437 g of water as liquid A, and dissolve 110 g of ammonium chloride in 437 g of water as liquid B. Add liquid A into liquid B and stir thoroughly to obtain a viscoelastic fluid. Stir until uniform, forming The clear and translucent anion cleaning fracturing fluid of the present invention has a certain viscosity.

[0046] The preparation and injection sequence of the gel breaker is the same as in Example 1. During fracturing, the pre-fluid, sand-carrying fluid, and displacement fluid are injected in the order, and the pre-fluid, sand-carrying fluid, and displacement fluid all use the clean fracturing fluid of the present invention . The viscosity-temperature curve of anionic viscoelastic fluid fracturing fluid is as follows: figure 2 shown.

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Abstract

The invention relates to the technical field of oil filed fracturing, and specifically relates to an anionic clean fracturing liquid, which is composed of 0.5 to 10% of anionic surfactant, 5 to 20% of counter-ion salts, and the balance being water. The provided clean fracturing liquid preserves all advantages of conventional clean fracturing liquids. The species of additives can be reduced and the requirements on liquid blending equipment can be lowered by using the clean fracturing liquid. The fracturing liquid can be used in oil fields with a high mineralization degree. The gel breaking time can be well controlled by using a gel breaker and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of oil field fracturing, in particular to the preparation and use of an anionic clean fracturing fluid and a gel breaker thereof, which can be used in oil field fracturing and gel breaking operations. Background technique [0002] Through the inaccurate statistics of my country's oil and natural gas reserves, it is found that low-permeability oil and gas reservoirs account for more than 50% of the total oil and gas reservoir resources and reserves. Although the reserves of low-permeability oil and gas reservoirs in my country are huge, the recoverability and development effect are not ideal. Among them, there are two key problems: one is the low production capacity of a single well; the other is the high cost of oil well exploitation. Therefore, developing low-permeability oil and gas reservoirs to the greatest extent has become the main goal to solve the contradiction between oil and gas supply and demand ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68E21B43/267
CPCC09K8/68C09K2208/26E21B43/267
Inventor 李科晶张晓杰方波
Owner EAST CHINA UNIV OF SCI & TECH
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