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Reusable resistance diminishing water system

A water resistance reduction and system technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor salt resistance, poor drainage performance, low resistance reduction rate, etc., to achieve low damage rate and increase production The effect is obvious and the effect of avoiding corrosion

Inactive Publication Date: 2018-11-23
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the existing problems of low resistance reduction rate, poor drainage performance, poor salt tolerance and non-recyclability, the present invention proposes a reusable water resistance reduction system. One of the purposes of the present invention is the drag reduction agent and The regulators are all liquid, and the thickening time is less than 10 seconds, which can realize online mixing

Method used

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Embodiment 1

[0037] In order to overcome the existing problems of low resistance reduction rate, poor drainage performance, and poor salt tolerance, the present invention proposes a reusable resistance reduction water system, which is mainly used for volume fracturing of tight oil and gas sandstone reservoirs in Changqing. The water resistance reducing water system can be thickened within 10s, and can be mixed with clean water or flowback liquid with a salt content within 100,000ppm. On-site construction adopts online mixing, and can realize instant conversion from low viscosity to high viscosity according to construction requirements, and has Better yield increase effect.

[0038] A reusable water resistance reducing system, which is formulated according to the following mass component ratios:

[0039] Drag reducing agent: 1.5 parts;

[0040] Regulator: 1 part;

[0041] The balance is the dosing water.

[0042] The drag reducing agent described in the present invention is 40-55% surfac...

Embodiment 2

[0045] Based on the above embodiments, in this embodiment, a reusable water resistance reducing system is formulated according to the following mass component ratios:

[0046] Drag reducing agent: 1 part;

[0047] Regulator: 0.5 parts;

[0048] The balance is the dosing water.

[0049] The drag reducing agent described in this embodiment is 40-55% surfactant, 4-15% salicylic acid, 10-20% solvent, and the balance is water. The solvent is one or more mixtures of methanol, isobutanol, ethylene glycol, and glycerin. The surfactant is one or more mixtures of lauryl tertiary amine oxide, oleic acid amidopropyl dimethylamine, erucic acid amidopropyl dimethylamine.

[0050] The regulator is acidic. The dosing water is clear water or fracturing flowback fluid with a salt content within 100,000 ppm. The fracturing flowback fluid with a salt content within 100,000ppm is the flowback fluid of reducing water resistance, corrupted or uncorrupted guar gum flowback fluid, corrupted or un...

Embodiment 3

[0052] In this embodiment, a reusable water resistance reducing system is formulated according to the following mass component ratios:

[0053] Drag reducing agent: 0.2 parts;

[0054] The balance is the dosing water.

[0055]Among them, the drag reducing agent is 40-55% surfactant, 4-15% salicylic acid, 10-20% solvent, and the balance is water. In this embodiment, the drag reducing agent is selected as 50% surfactant, 10% salicylic acid, 15% solvent, and the balance is water. The solvent is one or more mixtures of methanol, isobutanol, ethylene glycol, and glycerin. The surfactant is one or more mixtures of lauryl tertiary amine oxide, oleic acid amidopropyl dimethylamine, erucic acid amidopropyl dimethylamine. The dosing water is clear water or fracturing flowback fluid with a salt content within 100,000 ppm. The fracturing flowback fluid with a salt content within 100,000ppm is the flowback fluid of reducing water resistance, corrupted or uncorrupted guar gum flowback f...

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Abstract

The invention provides a reusable resistance diminishing water system. Te reusable resistance diminishing water system is prepared from the following components in parts by mass: 0.2 to 1.5 parts of aresistance diminishing agent, 0 to 1 part of a regulating agent and the balance of solution preparation water. Compared with conventional resistance diminishing water, the reusable resistance diminishing water system provided by the invention is better in water hardness, putrefying bacteria tolerance, acid-base adaptation, saltness, sand carrying ability and the like, and has the characteristicsof strong water adaptation, low friction, low damage, high swelling resistance and high emission assistance; by adopting reusable resistance diminishing water, online blending construction can be realized, solution preparation in advance and continuous blending equipment are omitted, and a larger popularization and application prospect is obtained.

Description

technical field [0001] The invention relates to a reusable water resistance reducing system, which is mainly used for volume fracturing reconstruction of tight oil and gas sandstone reservoirs. Background technique [0002] The resistance-reducing water system mainly utilizes the low-friction effect of the drag-reducing agent to realize low-pressure construction in tight reservoirs, and the resistance-reducing rate is the key index of the drag-reducing agent. At present, the drag-reducing agents used for water-resistance-reducing water systems at home and abroad are mainly polyacrylamide polymers. According to different production and processing methods, such drag-reducing agents can be subdivided into two types: emulsion type and powder type. During on-site construction, the powder-type drag-reducing agent must be formulated into an aqueous solution manually or with liquid-mixing equipment, which brings a lot of inconvenience to large-scale fracturing operations in tight re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/665C09K8/68C09K2208/32
Inventor 王改红高燕张冕李泽锋马新东王亚军安子轩尹国勇武志学陈亚联王新强宇文昔涵
Owner BC P INC CHINA NAT PETROLEUM CORP
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