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Method to increase the effect of volume fracturing in complex oil and gas layer fracture network

A technology for volume fracturing and oil and gas formation, which is applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc. It can solve the problem of increasing the volume fracturing effect of the fracture network of complex oil and gas formations, rapid decline of pressure and production after fracturing, and increasing production. In order to improve the fracturing stimulation effect and the degree of reservoir production, improve the stable production period after fracturing, and maximize the stimulation effect of fracture network volume

Active Publication Date: 2021-09-28
克拉玛依科美利化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention provides a method for increasing the effect of fracture network volume fracturing in complex oil and gas layers, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problems of poor regularity of production stimulation effect and post-fracture failure of conventional fracture network volume fracturing technology. Problems of pressure and rapid production decline and short stable production period

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  • Method to increase the effect of volume fracturing in complex oil and gas layer fracture network
  • Method to increase the effect of volume fracturing in complex oil and gas layer fracture network
  • Method to increase the effect of volume fracturing in complex oil and gas layer fracture network

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Embodiment 1

[0027] Embodiment 1, the method for increasing the volume fracturing effect of the fracture network in complex oil and gas layers is characterized in that it is carried out according to the following steps: the first step, the planar fracture network is reformed, and the planar fractures of the fractured reservoir near the perforation point are sequentially Alternate injection of non-acid slick water and acid slick water; second step, formation of viscosified branch joints, viscosification of non-acid slick water and acid slick water and addition of support diversion agent; third step, formation of artificial cracks, injection of water base Fracturing fluid, forming artificial fractures with a fracture length of not less than 100 meters on both sides of the perforation point; the fourth step, three-dimensional fracture network reconstruction, alternately injecting non-acidic slick water and acidic slick water, and performing fracture network on the artificial fracture wall surfa...

Embodiment 2

[0029] Embodiment 2, as the optimization of above-mentioned embodiment, acid slippery water comprises the hydrochloric acid of 5 parts to 25 parts, the hydrofluoric acid of 0 part to 8 parts, the corrosion inhibitor of 1 part to 2 parts, the lemon of 0.5 part to 1 part Acid, 0.5 to 1 part of drainage aid, 0.5 to 2.5 parts of drag reducing agent, and the acidic slippery water needs to meet the corrosion inhibition rate ≤ 0.5g / m2 h, compared with clear water, the drag reduction rate ≥ 40% , The viscosity of the acid solution is ≤10mPa·s, the optimum viscosity is 2mPa·s to 8mPa·s, and the surface tension is ≤25mN / m. The acidic slick water of the present invention has a good corrosion inhibition effect, and in the case of the optimal dosage, the corrosion inhibition rate is ≤0.5g / cm 2 .h; to minimize the damage caused by acid corrosion of the oil casing.

Embodiment 3

[0030] Embodiment 3, as an optimization of the above-mentioned embodiment 2, the corrosion inhibitor in acidic slippery water is an imidazoline type corrosion inhibitor; or / and, the drainage aid is a fluorocarbon type drainage aid; or / and, the drag reducing agent It is an acid-resistant drag-reducing agent, which is formed by copolymerization of acrylamide monomer and other acid-resistant and salt-resistant monomers, with a molecular weight between 6 million and 10 million. The imidazoline type corrosion inhibitor is preferably KML-HS acidification corrosion inhibitor or ALS-2 acidification corrosion inhibitor, KML-HS acidification corrosion inhibitor is produced by Karamay Kemeili Chemical Co., Ltd., ALS-2 acidification corrosion inhibitor is produced by Produced by Shandong Anqiu Plasticizer Factory; the drainage aid is preferably KML-ZP acidification drainage aid or YL-103 acidification drainage aid, KML-ZP acidification drainage aid is produced by Karamay Kemeili Chemical C...

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Abstract

The invention relates to the technical field of oil field fracturing and acidification, and is a method for increasing the volume fracturing effect of complex oil and gas layer fracture networks. , the third step is the formation of artificial fractures, the fourth step is the reconstruction of the three-dimensional fracture network, the fifth step is filling sand in the artificial fractures; the sixth step is injecting displacement fluid and shutting down the well for a period of time to test the oil and gas production. The present invention can maximize fracture network volume fracturing reconstruction around the perforation point, maximally improve the fracture volume and the long-term effect of the diversion capacity and the stable production period after fracturing, and use the method of the present invention to save 10% To 30% of the working fluid, the present invention improves the fracture network volume fracturing effect of the irregular ellipse with a low thickness on the conventional plane to a fracture network volume fracturing effect with a higher three-dimensional degree, and the present invention is simple and convenient for on-site construction It is easy to implement, can reduce the amount of slippery water, and can be used for integrated construction in a ready-to-use and ready-to-mix mode.

Description

technical field [0001] The invention relates to the technical field of oil field fracturing and acidification, and relates to a method for increasing the volume fracturing effect of complex oil and gas layer fracture networks. Background technique [0002] Complex oil and gas formations in the present invention refer to: the lithology is shale, sandstone or volcanic rock, and the fracture filling materials are calcite minerals, clay minerals or other silicate minerals, etc., and these minerals each occupy a certain proportion in the reservoir to form fractures Sexual reservoir. These reservoirs are characterized by deep burial and complex lithology, mainly composed of mud, argillaceous carbonate rock and calcareous mudstone; sometimes they have the characteristics of high clay content, strong water sensitivity, and poor reservoir physical properties, so this kind of reservoir It is very difficult to select the formation reforming process, it is difficult to add sand to frac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/27
CPCE21B43/26
Inventor 张仲春张明马中国张瑞李建芳
Owner 克拉玛依科美利化工有限责任公司
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