Long-acting anti-swelling agent for fracturing and preparing method and application thereof

An anti-swelling agent, long-acting technology, applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve problems such as poor long-term anti-swelling effect, and achieve inhibition of particle migration and adsorption damage Small, strong washout effect

Inactive Publication Date: 2016-08-10
PETROLEUM ENG TECH RES INST OF JIANGHAN OILFIELD BRANCH OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As described in the patent No. CN102786924A "an anti-swelling agent and its production process", the anti-swelling agent is mainly composed of 0.1-2.0% cationic polymer and 20-30% BCS-851 clay stabilizer. Mainly, it can effectively prevent the hydration expansion, dispersion and migration of clay minerals, resist water erosion, prolong the water injection cycle, and achieve good effects of oil well increase and water well injection increase, but its long-term anti-swelling effect is not good

Method used

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  • Long-acting anti-swelling agent for fracturing and preparing method and application thereof

Examples

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Effect test

Embodiment 1

[0018] A long-acting anti-swelling agent for fracturing, in terms of mass percentage, including the following components: surfactant OP-10 50%, organic anti-swelling agent BSF 4%, inorganic anti-swelling agent KCl 15% and 31% water.

[0019] The preparation method of the above-mentioned long-acting anti-swelling agent for fracturing is as follows:

[0020] Take 31ml of water, 50g of OP-10 surfactant (from Wuhan Longruida Technology Development Co., Ltd.), and 4g of organic anti-swelling agent BSF (from Hubei Xingzhongcheng Technology Co., Ltd.) at room temperature and normal temperature. Add 15g of inorganic anti-swelling agent KCl (from Wuhan Huachuang Chemical Co., Ltd.) after cooling to 25°C, and stir for 1 hour to prepare 100g of long-acting anti-swelling agent for fracturing, marked as long-acting anti-swelling agent No. 1.

Embodiment 2

[0022] A long-acting anti-swelling agent for fracturing, in terms of mass percentage, including the following components: surfactant OP-10 60%, organic anti-swelling agent BSF 3%, inorganic anti-swelling agent KCl 8% and 29% water.

[0023] The preparation method of the above-mentioned long-acting anti-swelling agent for fracturing is as follows:

[0024] Take 29ml of water surfactant OP-10 60g and organic anti-swelling agent BSF 3g into the airtight pressure reactor at room temperature and pressure, start stirring, gradually raise the temperature to 100℃ and react for 3 hours, then cool to 25℃ and add 8g inorganic Anti-swelling agent KCl was stirred for 0.5 hours to prepare 100g of long-acting anti-swelling agent for fracturing, which was marked as long-acting anti-swelling agent No. 2.

Embodiment 3

[0026] A long-acting anti-swelling agent for fracturing, in terms of mass percentage, including the following components: surface active agent OP-10 65%, organic anti-swelling agent BSF 2%, inorganic anti-swelling agent KCl 5% and 28% water.

[0027] The preparation method of the above-mentioned long-acting anti-swelling agent for fracturing is as follows:

[0028] Take 28ml of water, 70g of OP-10 surfactant and 2g of organic anti-swelling agent BSF at room temperature and pressure, add them into the closed pressure reactor, start stirring, gradually increase the temperature to 100°C and react for 3 hours, then cool 25 After ℃, add 5g of inorganic anti-swelling agent KCl and stir for 0.5 hours to prepare 100g of long-acting anti-swelling agent for fracturing, which is marked as long-acting anti-swelling agent No. 3.

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Abstract

The invention provides a long-acting anti-swelling agent for oil field fracturing and a preparing method and application thereof .The long-acting anti-swelling agent is prepared from, by mass, 50-65% of surfactant, 2-5% of an organic anti-swelling agent, 5-15% of inorganic anti-swelling agent and 15-43% of water .The formation damage rate of the long-acting anti-swelling agent is smaller than 8.6%, and the long-acting anti-swelling agent is small in formation damage, long in anti-swelling cycle and high in compatibility with fracturing liquid.

Description

Technical field [0001] The present invention relates to the field of oil fields and oil wells, and more particularly, to a long-acting anti-swelling agent for fracturing and its preparation method and application. Background technique [0002] In some blocks of the oilfield, the content of clay minerals is relatively high, with an average clay mineral content reaching 13.13%. The clay minerals are mainly composed of clay minerals that are easy to expand and kaolinite, which is easy to migrate. Blocking the pore channels of the formation and reducing the permeability of the reservoir may also cause sand production, which affects the stability of oil well production and the effectiveness of measures. At present, oilfields mainly use clay stabilizers as KCl in fracturing fluids. Although such inorganic salt anti-swelling agents have good short-term anti-swelling effects, they are short-term anti-swelling agents due to their poor erosion resistance and short validity period. Molecul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/86C09K8/88C09K8/68E21B43/267
CPCC09K8/03C09K8/68C09K8/86C09K8/882C09K2208/12E21B43/267
Inventor 陆昌盛李亚林张凡陈晖唐芳袁用波汪晋饶翔
Owner PETROLEUM ENG TECH RES INST OF JIANGHAN OILFIELD BRANCH OF
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