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Fracture network volumetric acid fracturing method of carbonate reservoir

A carbonate reservoir and carbonate technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problem of short production stabilization period, too fast oil and gas production decline, and poor acid fracturing effect of oil and gas wells and other problems, to achieve the effect of strong steering ability and reduce secondary damage

Inactive Publication Date: 2019-07-19
克拉玛依科美利化工有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a carbonate reservoir fracture network volumetric acid fracturing method, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the ineffective acid fracturing effect of oil and gas wells existing in the development technology of carbonate reservoir oil and gas reservoirs. Problems of good oil and gas production decline and short stable production period

Method used

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  • Fracture network volumetric acid fracturing method of carbonate reservoir

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Effect test

Embodiment 1

[0019] Embodiment 1: The carbonate reservoir fracture network volumetric acid fracturing method is carried out according to the following method: the first step, at 2m 3 / min to 3m 3 Under the pump injection displacement per minute, inject 50m 3 / section up to 100m 3 For the low-viscosity slick water acid fluid in the / section, replace the spacer fluid with a volume of one wellbore, and stop the pump for 20 to 60 minutes to reduce the migration resistance of the low-viscosity slick water acid fluid near the wellbore; the second step, at 4m 3 / min to 7m 3 Injection of 150m into wells in carbonate oil and gas fields 3 / section up to 200m 3 The low-viscosity milky-slick water acid fluid in the / section performs fracture network volumetric acid fracturing on the dominant fracture channels near the perforation section; the third step, when the reconstruction degree of the dominant fracture reaches the first stage in the low-viscosity milky-slick water acid fluid The injection...

Embodiment 2

[0023] Embodiment 2: The carbonate reservoir fracture network volumetric acid fracturing method is carried out according to the following method: the first step, at 2m 3 / min or 3m 3 Under the pump injection displacement per minute, inject 50m 3 / section or 100m 3 The low-viscosity slick water acid fluid in the / section is replaced with a wellbore volume of spacer fluid, and the pump is stopped for 20 minutes or 60 minutes to reduce the migration resistance of the low-viscosity slick water acid fluid near the wellbore; 3 / min or 7m 3 Injection of 150m into wells in carbonate oil and gas fields 3 / section or 200m 3 The low-viscosity milky-slick water acid fluid in the / section performs fracture network volumetric acid fracturing on the dominant fracture channels near the perforation section; the third step, when the reconstruction degree of the dominant fracture reaches the first stage in the low-viscosity milky-slick water acid fluid The injection volume is 100m 3 / sec...

Embodiment 3

[0024] Embodiment 3: As an optimization of the above embodiment, the raw material formula of the low-viscosity milky water acid liquid includes 10 to 25 parts of hydrochloric acid, 0.5 to 3 parts of corrosion inhibitor, and 0.5 to 1 part of lemon Acid, 0.5 to 3 parts of drainage aid, 0.5 to 3 parts of foaming agent, 0.1 to 1 part of acid thickener, 2 to 8 parts of emulsifier, 10 to 20 parts of emulsified oil, the low viscosity The milk-slick water acid solution is obtained by mixing the required amount of hydrochloric acid, corrosion inhibitor, citric acid, drainage aid, foaming agent, acid thickener, emulsifier and emulsified oil.

[0025] In the present invention, the viscous slick water acid solution dissolves the soluble minerals on the wall surface of the crack and in the crack to achieve the purpose of further expanding the pores and increasing the solubility of the opened micro-cracks. According to Darcy's law, the excessive Acid extension pressure at the end of microcr...

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Abstract

The invention relates to the technical field of carbonate oil and gas field development, and provides a fracture network volumetric acid fracturing method of a carbonate reservoir. The fracture network volumetric acid fracturing method includes the following steps that a low-viscosity emulsion slippery water acid solution is injected into a carbonate oil and gas field well, and migration resistance of the low-viscosity emulsion slippery water acid solution near the wellbore area is lowered; the low-viscosity emulsion slippery water acid solution is injected into the carbonate oil and gas fieldwell, and fracture network volumetric acid fracturing modification is conducted on a dominant fracture channel near the perforation section; vegetable glue liquid is pumped into the carbonate oil andgas field well, and the steering process of low-viscosity emulsion slippery water acid solution is completed; the low-viscosity emulsion slippery water acid solution is continuously pumped into the carbonate oil and gas field well, and the fracture network volumetric acid fracturing modification process is completed; and displacement fluid is injected into the carbonate oil and gas field well, and the oil and gas production is tested. According to the fracture network volumetric acid fracturing method of the carbonate reservoir, the low-viscosity emulsion slippery water acid solution can lower the migration resistance of acid liquor in fractures near the well to the distance, and a long and complex fracture system is formed advantageously; and meanwhile, the vegetable glue liquid has thehigh steering ability and glue is prone to being broken by oxygen, the secondary damage of steering fluid to the reservoir can be reduced, and the purposes of carbonate acid fracturing well stimulation and stable production are achieved.

Description

technical field [0001] The invention relates to the technical field of carbonate oil and gas field development, and relates to a carbonate reservoir fracture network volumetric acid fracturing method. Background technique [0002] my country is rich in carbonate oil and gas resources, such as the Lungu Oilfield and Tahe Oilfield in the Tarim Basin, the Lixian Buried Hill Oilfield in the Bohaiwan Basin, the Luojiazhai Gasfield and Puguang Gasfield in the Sichuan Basin, the Lower Paleozoic Oilfield in the Ordos Basin, Nanyishan Oilfield in Damu Basin, Qingxi Oilfield in Jiuquan Basin, etc., the lithology of these main oil and gas layers is carbonatite. Therefore, improving the development technology of carbonatite oil and gas reservoirs, especially acid fracturing technology, has become an important prerequisite for ensuring energy supply. [0003] In carbonate reservoirs, oil and gas mainly exist in fractures or caves. Therefore, how to increase the permeability of fractures ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27
CPCE21B43/26
Inventor 张仲春张瑞李建芳艾肯江·吾不力哈斯木
Owner 克拉玛依科美利化工有限责任公司
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