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Preparation method of ultra-microcapsule breaker for shale gas fracturing fluid

A gel breaker and air pressure technology, applied in the fields of chemical materials and oil fields, can solve problems such as sufficient gel breaking of fracturing fluid, and achieve the effects of increasing gas production rate, small particle size and low material cost

Active Publication Date: 2016-08-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a preparation method of an ultramicrocapsule gel breaker for shale gas fracturing fluid; the particle size of the ultramicrocapsule gel breaker obtained by the method of the present invention is only 5-50 μm ; It can solve the problem of fully breaking the fracturing fluid in the micro-fractures of the rock formation

Method used

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  • Preparation method of ultra-microcapsule breaker for shale gas fracturing fluid
  • Preparation method of ultra-microcapsule breaker for shale gas fracturing fluid
  • Preparation method of ultra-microcapsule breaker for shale gas fracturing fluid

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Embodiment 1

[0052] The preparation method of embodiment 1, ethyl cellulose microsphere, carries out following steps successively:

[0053] ①. Dissolve 0.8g of ethyl cellulose in 10g of ethyl acetate, and use a magnetic stirrer to fully stir at 1000rpm for 1h, as an oil phase precursor;

[0054] ②. Dissolve 2g of SDS (sodium dodecylsulfonate) in 100g of ethyl acetate saturated aqueous solution, and use a magnetic stirrer to fully stir at 1000rpm for 1h, as an aqueous phase reaction system;

[0055] ③. Slowly add the oil phase precursor obtained in step ① (the addition is completed in about 1-3 minutes) to the aqueous phase reaction system obtained in step ②, and continue stirring for 1 hour to obtain an emulsion dispersion of ethyl cellulose microspheres;

[0056] ④. Dissolve 1g of SDS in 300g of deionized water to form an aqueous solution; then add the milky dispersion obtained in step ③; use a magnetic stirrer to continue stirring at 1000rpm for 1 hour;

[0057] ⑤. The resultant of step...

Embodiment 2

[0060] Embodiment 2, the preparation method of ultramicrocapsule gel breaker for shale gas fracturing fluid, the following steps are carried out successively:

[0061] 1), formula:

[0062]

[0063] 2), Porous microsphere loading:

[0064] Add the porous microspheres into the saturated solution of the gel breaker, and keep stirring for 0.5 hours in a constant temperature water bath that maintains a temperature of 5-10°C above the melting point of the hot-melt material, so that the gel breaker is loaded on the porous microspheres;

[0065] Remarks: The melting point of palm wax is 81-86°C.

[0066] 3), the formation of hot-melt coating:

[0067] In step 2), add hot-melt material, anionic emulsifier, and cationic emulsifier for uniform mixing, and heat until the hot-melt material melts (that is, heat to above the melting point of the hot-melt material); to obtain a milky dispersion;

[0068] 4), cladding layer stabilization:

[0069] Cool the milky dispersion obtained in...

Embodiment 3

[0072] Embodiment 3, formula is changed into following content, all the other are with embodiment 2.

[0073] 1), formula:

[0074]

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Abstract

The invention discloses a preparation method of a superfine-capsule-type gel breaker for a shale gas fracturing fluid. The method comprises the following steps: preparing a formula containing 65% to 75% of gel breaker saturation solution, 9% to 11% of porous microspheres, 5.5% to 10.5% of hot-melting material, 5.5% to 10.5% of cationic emulsifier or neutral emulsifier and 2% to 6% of anionic emulsifier; then, sequentially carrying out porous microsphere loading, formation of hot-melting coating and stabilization of a coating layer; and finally, carrying out suction filtration, washing and drying. The particle diameter of the obtained superfine-capsule-type gel breaker is only between 5mu m and 50mu m. According to the superfine-capsule-type gel breaker, the problem that the gel breaking of the fracturing fluid in a micropore channel of a rock stratum cannot be fully carried out is effectively solved; the gas yield of a shale gas is obviously increased. The method is simple in preparation process, good in repeatability, free of pollution and low in energy consumption.

Description

technical field [0001] The invention belongs to the technical fields of chemical materials and oil fields, in particular to a production process of a gel breaker in shale gas well fracturing. Background technique [0002] Shale gas is a typical unconventional natural gas, which is produced in reservoir rock series dominated by organic-rich shale with extremely low porosity and permeability. The formation and enrichment of shale gas are self-generated and self-storage, mainly free gas and adsorbed gas, and in-situ saturated and enriched in the micro-nano pores, fractures and mineral particle surfaces of the shale-dominated reservoir rock series mouth. Shale gas is often referred to as "man-made gas reservoirs". The exploitation of shale gas requires large-scale man-made fractures (networks) to form industrial production capacity. [0003] Shale gas generally has high initial production, rapid decline in the early stage, low and stable production in the later stage, and a lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/62
CPCC09K8/602C09K8/604C09K8/706C09K2208/26
Inventor 郭兴忠韩达新杨辉骆仲泱王涛
Owner ZHEJIANG UNIV