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A kind of seawater-based instant fracturing fluid and preparation method thereof

A fracturing fluid and base velocity technology, applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of serious water production in offshore formations, limited large-scale fracturing, and high fracturing control fractures, so as to reduce costs and reduce costs. Construction risks, promotion of large-scale applications, and overall cost reduction effects

Active Publication Date: 2017-02-15
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the influence of the construction environment, the cost and construction risk are increased, which limits the large-scale application
Transportation of equipment, transformation of tugboats; placement and application of equipment on the platform, large-scale fracturing is limited; water in offshore formations is serious, and fracture height control during fracturing is a big challenge

Method used

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  • A kind of seawater-based instant fracturing fluid and preparation method thereof
  • A kind of seawater-based instant fracturing fluid and preparation method thereof
  • A kind of seawater-based instant fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0028] A seawater-based instant fracturing fluid is composed of 97 parts of base fluid and 3 parts of cross-linking fluid; the base fluid is composed of 98.1 parts of water, 0.2 parts of thickening agent, 1.0 part of colloidal protective agent, 0.2 parts of synergist and 0.1 part of demulsification and drainage aid; the cross-linking liquid is composed of 49.6 parts of water, 50 parts of cross-linking agent and 0.4 part of gel breaker.

[0029] The preparation method of this fracturing fluid, the steps are as follows:

[0030] 1) Preparation of base liquid: Add the formula thickener, colloid protective agent, demulsification aid and synergist into the powder tank of the continuous mixing vehicle used on site, mix and pour into the formula In the water tank with a large amount of water, the mixing vehicle adjusts the powder feeding speed of the powder tank according to the construction requirements. The speed is 6-12kg / min and the suction speed of the water base material suctio...

Embodiment ２

[0040] Basically the same as Example 1, the difference is:

[0041] The fracturing fluid is composed of 97 parts of base fluid and 3 parts of crosslinking fluid; the base fluid is composed of 98.5 parts of water, 0.6 parts of thickener, 1.0 part of colloidal protective agent, 0.2 part of synergist and 0.1 part of demulsifier Drainage aid composition; The cross-linking solution is composed of 49.6 parts of water, 50 parts of cross-linking agent and 0.4 part of gel breaker.

[0042]The colloidal protective agent used in this example is an organic phosphine series scale inhibitor, specifically 2-phosphonic acid butane-1,2,4-tricarboxylic acid PBTCA; the crosslinking agent used in this example is zirconium oxychloride. What the gel breaking agent of present embodiment adopts is potassium persulfate; Described demulsification aid drainage agent is made of water, fluorocarbon surfactant FC-211, sodium dodecyl sulfate SDS, nonylphenol polyoxyethylene ether OP -10 is compounded accor...

Embodiment ３

[0044] Basically the same as Example 1, the difference is:

[0045] The fracturing fluid is composed of 97 parts of base fluid and 3 parts of cross-linking fluid; the base fluid is composed of 98.3 parts of water, 0.4 parts of thickener, 1.0 part of colloidal protective agent, 0.2 parts of synergist and 0.1 part of Composition of demulsification and drainage aids; the cross-linking liquid is composed of 49.6 parts of water, 50 parts of cross-linking agent and 0.4 part of gel breaker.

[0046] The colloidal protective agent used in this example is a polycarboxylic acid scale inhibitor dispersant, specifically polyepoxysuccinic acid (sodium) PESA; the crosslinking agent used in this example is tetrabutyl zirconate. The breaker used in the present embodiment is ammonium persulfate; the demulsification and drainage aid is composed of water, fluorocarbon surfactant FC-211, sodium dodecyl sulfate SDS, nonylphenol polyoxyethylene ether OP -10 is compounded according to the mass rati...

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Abstract

The present invention relates to a seawater-based quick-dissolving fracturing liquid and a preparation method therefor. The fracturing liquid consists of 65 - 99.99 parts of a base liquid and 0.01 - 35.0 parts of a cross-linking liquid, wherein the base liquid consists of 95.0 - 99.6 parts of water, 0.1 - 1.0 part of a thickening agent, 0.1 - 2.0 parts of a colloidal protective agent, 0.1 - 1.0 part of a synergist and 0.1 - 1.0 part of a demulsifying-cleanup agent; and the cross-linking liquid consists of 0 - 99.9 parts of water, 0.1 - 100.0 parts of a cross-linking agent and 0.001 - 0.5 part of a gel breaker. The prepared seawater-based quick-dissolving fracturing liquid has properties of quick dissolution, salinity resistance, high temperature resistance etc., which can meet the requirement of a mode in which a blending truck self-absorbs seawater for fracturing while compounding, thereby reducing the cost and the risk of construction, promoting large-scale applications, reducing the overall cost by not less than 30% of that of a conventional mode, innovating the off-shore fracturing mode, having a good economic benefit and tremendous social benefit, and having a broad application prospect.

Description

technical field [0001] The invention relates to a seawater-based instant fracturing fluid used in offshore seawater-based instant fracturing fluid fracturing stimulation technology and a preparation method thereof. Background technique [0002] Offshore fracturing technology has been widely used in oil and gas fields in the North Sea of ​​Europe, the Gulf of Mexico, Brazil, and Southeast Asia since the 1980s. Especially in North Sea oil fields, fracturing has become an important technical means for well completion, sand control, and production stimulation. [0003] China is substantially increasing offshore oil extraction, and deep-water oil extraction will be one of the priorities of the global oil strategy in the future. my country's deep-water oil exploration and development is still in its infancy, and the possession of large-scale deep-water equipment will enable China's offshore oil fields to have the ability to conduct offshore operations in various deep-water fields ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/90C09K8/528C09K8/602C09K8/685C09K8/88C09K2208/24C09K2208/26
Inventor 孙虎王祖文张冕廖乐军郭伟林陈亚联赵文钢李婧高燕李楠高红平魏晓龙李环向王科萌陈飞马捷包霞
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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