Crack forming method for multiple scales of cracks
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A multi-scale, fracture-making technology, applied in the direction of earth drilling, production fluid, wellbore/well components, etc., can solve the problems of low fracturing success rate of complex fractures, increased fracture complexity and fracturing construction success rate, etc.
Active Publication Date: 2019-01-04
CHINA PETROLEUM & CHEM CORP +1
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[0004] One of the technical problems to be solved by the present invention is the low success rate of fracturing complex fractures at present. It provides a new multi-scale fracture fracturing technology, which can realize sequential fracturing of multi-scale fractures, increasing the complexity of fractures and fracturing. Crack construction success rate
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example 1
[0058] Example 1: Take a certain tight oil well X in China as an example to further illustrate the present invention:
[0059] (1) Precise evaluation of reservoirs before fracturing
[0060] Based on the results of the constant-speed mercury injection experiment, the microscopic pore-throat structure parameters of the core were obtained, and the basic parameters such as rock mechanical parameters and in-situ stress characteristics were obtained by using acoustic emission technology and dipole acoustic logging technology.
[0061] (2) Preparation of artificial rock samples
[0062] On the basis of (1), use natural quartz sand and cement with different particle sizes (100 mesh, 20 / 40 mesh, etc.) and mix them in different proportions to simulate the throat radius after classification in (1) to prepare a 300mm square large rock samples for use.
[0063] (3) Physical simulation experiment of core fracture rupture and expansion with different pore throat structure parameters
[0...
example 2
[0077] Example two: Take a certain tight gas well Y in China as an example to further illustrate the present invention:
[0078] (1) Precise evaluation of reservoirs before fracturing
[0079] According to the results of constant-speed mercury injection experiments, the microscopic pore-throat structure parameters of the core were obtained, and the basic parameters such as rock mechanical parameters and in-situ stress characteristics were obtained by using acoustic emission technology and dipole acoustic logging technology.
[0080] (2) Preparation of artificial rock samples
[0081] On the basis of (1), use natural quartz sand and cement with different particle sizes (100 mesh, 20 / 40 mesh, etc.) and mix them in different proportions to simulate the throat radius after classification in (1) to prepare a 300mm square large rock samples for use.
[0082] (3) Physical simulation experiment of core fracture rupture and expansion with different pore throat structure parameters
[...
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Abstract
The invention discloses a crack forming method for multiple scales of cracks. The crack forming method comprises the following steps that basic parameters comprising micro pore-throat structure parameters, rock mechanics parameters and ground stress characteristics of a rock core of a reservoir stratum are measured; artificial rock samples are prepared according to the basic parameters, physical simulation experiments for rock core crack rupture and extension are carried out on the artificial rock samples, and the rupture pressure characteristics and elongation characteristics of the artificial rock samples under different fracturing fluid viscosity and displacement combination are determined; based on the rupture pressure characteristics and elongation characteristics determined by the physical simulation experiments, a crack forming technology for the two or more levels of scales of cracks is determined through a reservoir crack extension physical simulation system; and sequential crack forming construction of the multiple scales of cracks is conducted according to the crack forming technology. According to the crack forming method, the complexity of the fracturing cracks can beincreased, the crack forming success rate of the complex cracks is increased, thus the reservoir transformation volume is increased, and efficient production increasing and stable production are achieved.
Description
technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to a fracture-making method for multi-scale fractures. Background technique [0002] The current hydraulic fracturing technology has transitioned from conventional single fracture fracturing to complex fracture and volume fracture fracturing technology. However, the formation of complex fractures and volume fractures depends on suitable geological conditions and supporting engineering conditions. The so-called suitable geological conditions refer to that the brittle mineral content of the rock (generally including quartz and carbonate rock) is relatively high (generally greater than 60%), and the horizontal principal stress difference coefficient (the difference between the maximum and minimum horizontal principal stress and the minimum horizontal principal stress The ratio of principal stress) is relatively small (generally less than 0.25), natural fractures should be relat...
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