Variant-hydrochloric-acid-concentration acid fracturing method for carbonate reservoir

A carbonate rock reservoir, hydrochloric acid concentration technology, applied in chemical instruments and methods, earthwork drilling, production of fluids, etc., can solve the problems of lowering the cloud point of the demulsifier and weakening the demulsifier's demulsification ability.

Inactive Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP
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  • Abstract
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  • Claims
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Problems solved by technology

However, after the acid fracturing construction, the residual acid after the reaction between the acid liquid system and the carbonate rock reduces the cloud point of the demulsifier, enhances the lipophilicity of the demulsifier, and the demulsifier adsorbed on the oil-water

Method used

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  • Variant-hydrochloric-acid-concentration acid fracturing method for carbonate reservoir
  • Variant-hydrochloric-acid-concentration acid fracturing method for carbonate reservoir
  • Variant-hydrochloric-acid-concentration acid fracturing method for carbonate reservoir

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Embodiment

[0074] The acid fracturing method for variable hydrochloric acid concentration of carbonate rock reservoirs of the present invention will be described in detail below through the field test of Tahe Oilfield.

[0075] Firstly, the liquid composition involved in the acid fracturing pump injection process is described as follows, and the following percentages refer to mass % unless otherwise specified.

[0076] Slick water: Guar gum of model GRJ-11 sold by Jianghan Fracturing Company + additives sold by Xinjiang Luntai Like Oilfield Technical Service Co., Ltd., the composition is: 0.2% GRJ-11 guar gum + 0.1% GX-3 fungicide + 0.025% pH regulator, and the rest is water, wherein the guar gum is usually guar gum hydroxypropyl trimethyl ammonium chloride.

[0077] Fracturing fluid: the above-mentioned guar gum + additives sold by Xinjiang Luntai County Like Oilfield Technical Service Co., Ltd., the composition is: 0.5% GRJ-11 guar gum + 0.02% pH regulator + 1.0% HS-308 cracking fluid ...

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Abstract

The invention relates to variant-hydrochloric-acid-concentration acid fracturing method for a carbonate reservoir. The variant-hydrochloric-acid-concentration acid fracturing method is characterized by sequentially injecting high-concentration hydrochloric acid and low-concentration hydrochloric acid into the stratum and particularly comprises the following procedures: (1) injecting slick water into the stratum; (2) injecting a fracturing fluid into the stratum, wherein the viscosity of the fracturing fluid is 100-400 mPa.s; (3) injecting a gelled acid system in which the mass percent of HCL is 20 percent into the stratum; (4) injecting a gelled acid system in which the mass percent of HCL is 15 percent into the stratum; and (5) injecting slick water into the stratum. The volume ratios of liquid injected in the procedures (1), (2), (3), (4) and (5) in the total amount of liquid in the stratum are respectively 3-10 percent, 40-60 percent, 20-30 percent, 10-20 percent and 5-15 percent in sequence, and the volume unit is m<3>.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to an acid fracturing method for variable hydrochloric acid concentration in carbonate rock reservoirs. Background technique [0002] The main components of carbonate reservoirs are calcium carbonate and magnesium carbonate, and their mass percentages are above 95%. For such reservoirs, acid fracturing is usually used to achieve the purpose of stimulation. The acid fracturing process is also called the acid fracturing process. Its principle is that after the fracturing is hydraulically opened, the acid system with hydrochloric acid as the main component is injected, and the surface of the fracturing fracture is etched by the reaction of hydrochloric acid and carbonate rock. , so that the surface of the fracture becomes uneven, so that after the fracture is closed, a certain oil flow channel will be formed between the fracture walls, so that the formation fluid...

Claims

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Application Information

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IPC IPC(8): E21B43/27C09K8/74
Inventor 焦克波张雄赵海洋王雷耿宇迪秦飞孙同成李春月方彬唐清杨方政侯帆申成祎刘广燕孙桓米强波张泽兰宋志峰胡雅洁罗云方裕燕安娜
Owner CHINA PETROLEUM & CHEM CORP
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