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A method for improving the sand-carrying capacity of fracturing fluid and its fiber-containing fracturing fluid

A fracturing fluid and cleaning fracturing fluid technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problem that the fracturing fluid is difficult to meet the requirements, improve the sand-carrying capacity, reduce the dosage, and be easy to break glue effect

Active Publication Date: 2017-12-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But on the other hand, with the deepening of oil and gas reservoir development, the number of medium and low permeability reservoirs is increasing, and the fracturing fluid is required to have low residue and low damage, and the fracturing fluid with a high amount of thickening agent is difficult to meet the requirements.

Method used

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  • A method for improving the sand-carrying capacity of fracturing fluid and its fiber-containing fracturing fluid
  • A method for improving the sand-carrying capacity of fracturing fluid and its fiber-containing fracturing fluid
  • A method for improving the sand-carrying capacity of fracturing fluid and its fiber-containing fracturing fluid

Examples

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Embodiment 1

[0031] This embodiment provides a fiber-containing guar gum fracturing fluid, the preparation method of which is as follows:

[0032] Step 1: under stirring condition, add 0.2 weight part of thickener hydroxypropyl guar gum (China Petroleum Substances Kunshan Company), 0.12 weight part of sodium carbonate, 0.1 weight part of potassium chloride to 100 weight parts of water, then stir for 20min, Obtain guar thickener aqueous solution;

[0033]Step 2: During the fracturing operation, under stirring conditions, add 0.2 parts by weight of crosslinking agent FAL-120 (Langfang Vanke Petroleum and Natural Gas Technology Engineering Co., Ltd.) Ammonium sulfate, obtains guar gum fracturing fluid (does not contain fiber guar gum fracturing fluid);

[0034] Step 3: Add 0.5 parts by weight polyacrylonitrile fiber (the tensile strength is 100MPa, and the real density is 0.98g / cm2 in the above-mentioned guar gum fracturing fluid) 3 , the length is 5 mm, and the diameter is 78 μm), and stir...

Embodiment 2

[0037] This embodiment provides a fiber-containing polymer fracturing fluid, the preparation method of which is as follows:

[0038] Step 1: under stirring condition, add 0.3 weight part thickening agent nonionic synthetic polymer FA92 (Langfang Vanke Petroleum Technology Engineering Co., Ltd.), 0.02 weight part cross-linking regulator FAH-2 (Langfang City) to 100 weight parts water Vanke Petroleum and Natural Gas Technology Engineering Co., Ltd.), 0.1 parts by weight of potassium chloride, and then stirred for 20min to obtain an aqueous polymer thickener solution;

[0039] Step 2: During the fracturing operation, under stirring conditions, add 0.3 parts by weight of crosslinking agent FAG18 (Langfang Vanke Petroleum and Natural Gas Technology Engineering Co., Ltd.), 0.03 parts by weight of gel breaker ammonium persulfate to the above-mentioned thickener aqueous solution , to obtain polymer fracturing fluid (excluding fiber polymer fracturing fluid);

[0040] Step 3: Add 0.35...

Embodiment 3

[0043] This embodiment provides a fiber-containing clean fracturing fluid, the preparation method of which is as follows:

[0044] Step 1: under stirring condition, add 0.1 weight part of thickener gemini cationic surfactant SF-A (Langfang City Vanke Petroleum and Natural Gas Technology Engineering Co., Ltd.) to 100 weight parts of water, 0.1 weight part of sodium chloride, then stir for 20min, Get clean fracturing fluid (clean fracturing fluid without fibers);

[0045] Step 2: During the fracturing operation, under stirring conditions, add 0.4 parts by weight of gel breaker SF-C (Langfang Vanke Petroleum and Natural Gas Technology Engineering Co., Ltd.), 0.5 parts by weight of soluble polyethylene fiber to the above-mentioned clean fracturing fluid (The tensile strength is 110MPa, the real density is 1.12g / cm 3 , with a length of 8 mm and a diameter of 102 μm) were stirred and mixed evenly to obtain a fiber-containing clean fracturing fluid.

[0046] The fiber-containing cl...

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Abstract

The invention provides a method for improving sand-carrying capacity of fracturing fluid and fiber-containing fracturing fluid. The method for improving the sand-carrying capacity of the fracturing fluid comprises the step of adding fibers into the fracturing fluid, wherein the addition amount of the fibers is 0.3-0.8 weight part based on 100 weight parts of the fracturing fluid; the fibers have the tensile strength of 20-300MPa, the true density of 0.98-1.33g / cm<3>, the length of 3-15mm and the diameter of 25-150 microns; and the fibers refer to soluble fibers. The fiber-containing fracturing fluid provided by the invention refers to fracturing fluid prepared by the method. According to the method for improving the sand-carrying capacity of the fracturing fluid, the sand-carrying capacity can be improved, the amount of a thickening agent is reduced, the viscosity of base solution is reduced, and the damage and cost of the fracturing fluid can be further reduced. Moreover, residues of the fracturing fluid can be reduced, and gel breaking is easily realized by virtue of the fracturing fluid.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a method for improving the sand-carrying capacity of fracturing fluid and the fiber-containing fracturing fluid. Background technique [0002] Fracturing fluid is a liquid used in the process of oil and gas extraction to improve the conductivity of fractures. Its main function is to rupture the formation, create fractures of a certain geometric size, and carry proppant into the fracture to the predetermined position. With the emergence of large-scale fracturing technologies such as horizontal wells and industrial fracturing, new requirements are put forward for the sand-carrying capacity of fracturing fluids. The common practice is to increase the amount of thickener to achieve higher base fluid viscosity and gel Strength to achieve high sand ratio carrying sand. But on the other hand, with the deepening of oil and gas reservoir development, the number...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/68C09K8/685C09K8/882C09K8/90C09K8/905C09K2208/08C09K2208/26
Inventor 刘玉婷管保山王丽伟梁利翟文刘萍邱晓惠王海燕崔伟香明华
Owner PETROCHINA CO LTD
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