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Seawater-based fracturing fluid and preparation method thereof

A fracturing fluid and seawater technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient viscosity increasing performance, inability to meet continuous mixing, poor salt resistance and shear resistance, etc. Good shear thinning, preventing seawater pollution, improving salt resistance and shear resistance

Active Publication Date: 2016-02-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a seawater-based fracturing fluid and a preparation method of seawater-based fracturing fluid, which solves the problems of the seawater-based fracturing fluid in the prior art that cannot satisfy continuous mixing, insufficient viscosity increasing performance, and salt resistance. and technical problems of poor shear resistance

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  • Seawater-based fracturing fluid and preparation method thereof

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Embodiment 1

[0035] In this embodiment, a seawater-based fracturing fluid is provided, and the components included in 100 parts of the fracturing fluid and the weight ratio of the components are:

[0036] 0.3-0.8 part of thickener, 0.1-0.6 part of cross-linking agent, 0.05-0.1 part of oxygen scavenger, 0.02-0.05 part of viscosifying aid and 0.05-0.2 part of gel breaker, and all or part of the rest is sea water;

[0037] The thickener is specifically modified polyacrylamide; wherein, the modified polyacrylamide is formed by copolymerization of acrylamide, hydrophobically modified monomer and sulfonate; the hydrophobically modified monomer is dodecane Haloalkane; the sulfonate is 2-acrylamido-2-methylpropanesulfonic acid; wherein, the fracturing fluid has the hydrophobicity of the hydrophobic group through the hydrophobic association of the hydrophobic modification monomer function, to obtain good viscosity-increasing property and improve viscosity-increasing ability; through the copolymeriz...

Embodiment 2

[0065] In this embodiment, a preparation method of seawater-based fracturing fluid is provided, including:

[0066] Proportion by weight:

[0067] Weigh 98.3-99.3 parts of seawater into the mixer;

[0068] Add 0.3-0.8 parts of thickener into the mixer and stir;

[0069] Add 0.05-0.1 part of oxygen scavenger, 0.02-0.05 part of tackifier, 0.3-0.5 part of drainage aid, 0.1-0.3 part of retarder, 0.05-0.2 part of gel breaker and 0.1 part of - 0.6 parts of cross-linking agent, and stirred until the liquid level in the mixer rises slightly to obtain the seawater-based fracturing fluid.

[0070] Specifically, you can use a graduated cylinder to weigh 98.4-99.3 parts of filtered seawater and add it to the mixer, adjust the voltage of the mixer to 50V-55V, then add 0.3-0.8 parts of thickener, set the mixer to stir at high speed for 3 minutes ;

[0071] Then add 0.05-0.1 part of oxygen scavenger, 0.02-0.05 part of tackifier, 0.3-0.5 part of drainage aid, and 0.1-0.3 part of retardant...

example

[0075] 1. The specific ratio of seawater-based fracturing fluid in this example is:

[0076] The base fluid is based on 100 parts of the total solution mass of the prepared seawater-based fracturing fluid, wherein: the filtered seawater accounts for 99.3 parts of the total solution mass, the thickener accounts for 0.3 parts of the total solution mass, and the oxygen scavenger accounts for the total solution mass. 0.05 parts by mass, 0.02 parts of the total solution mass by the tackifier, 0.3 parts by the total solution mass by the drainage aid, and 0.1 part by the total solution mass by the retarder;

[0077] The gel breaker is based on the 0.05% mass fraction of the total solution of the base liquid, and the gel breaker is 0.05 parts.

[0078] The cross-linking agent is based on 0.1% mass fraction of the total solution of the prepared seawater-based fracturing fluid, and the cross-linking agent is 0.1 part.

[0079] The specific preparation method of the above-mentioned seaw...

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Abstract

The present invention discloses a seawater-based fracturing fluid and a preparation method thereof. 100 parts of the fracturing fluid comprises, by weight, 0.3-0.8 part of a thickener, 0.1-0.6 part of a cross-linking agent, 0.05-0.1 part of an oxygen scavenger, 0.02-0.05 part of a tackifying auxiliary agent, 0.05-0.2 part of gel breaker, and the balance or part of seawater, wherein the thickener modified polyacrylamide is formed by carrying out copolymerization on acrylamide, a hydrophobically modified monomer and a sulfonate, the hydrophobically modified monomer is dodecyl alkyl halide, and the cross-linking agent is an organic zirconium cross-linking agent or an organic titanium-zirconium composite cross-linking agent. According to the present invention, with the seawater-based fracturing fluid and the preparation method thereof, the technical problems of being incapable of continuously mixing, insufficient tackifying performance, poor salt resistance and poor shearing resistance of the seawater-based fracturing fluid in the prior art are solved; and the seawater-based fracturing fluid with characteristics of good tackifying, strong salt resistance, strong shearing resistance and continuous mixing and suitable for offshore oil fields is provided.

Description

technical field [0001] The invention relates to the technical field of drilling and production of oil and gas wells, in particular to a seawater-based fracturing fluid and a preparation method of the seawater-based fracturing fluid. Background technique [0002] At this stage, large-scale, factory-style fracturing has become an important technical means for developing low-permeability oilfields. The fracturing fluid used in offshore low-permeability oilfields is mainly mixed with fresh water in batches. Due to the limited space of the fracturing vessel, the limited volume of fracturing fluid, and the need for long-distance transportation of fresh water, there are disadvantages such as restricting the scale of fracturing, limiting the fracturing process, and high cost. It cannot meet the needs of large-scale and industrialized fracturing; my country's fresh water resources are scarce, and how to save fresh water resources is an urgent problem to be solved. Using seawater to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/665C09K8/685C09K8/882C09K8/887C09K2208/26
Inventor 陈紫薇张胜传贾云鹏刘学伟付大其周震曾晓辉
Owner PETROCHINA CO LTD
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