Competitive crack initiation and expansion simulation method and device for multi-cluster perforation in unconventional reservoirs
An unconventional, showering technology, applied in earthwork drilling, wellbore/well components, design optimization/simulation, etc. Unclear understanding of the law of multi-cluster perforation competition in high-quality reservoirs, and the law of fracture initiation and expansion, restricting the effect of staged multi-cluster fracturing in horizontal wells in unconventional reservoirs, etc., to achieve the effect of improving the effect of fracturing
Active Publication Date: 2021-10-22
SOUTHWEST PETROLEUM UNIV
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Therefore, the current research has not fully considered the effects of in-situ stress, reservoir heterogeneity, and fracture-induced stress on the subsequent perforation cluster initiation and fracture initiation sequence; The multi-cluster perforation and competitive fracture initiation of the reservoir are coupled together as a whole for research
Unclear understanding of multi-cluster perforation competitive fracture initiation and propagation laws in heterogeneous reservoirs restricts the fracturing effect of segmented multi-cluster horizontal wells in unconventional reservoirs
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[0106] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0107] Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furth...
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The invention provides a simulation method and device for multi-cluster perforation competitive crack initiation and expansion in unconventional reservoirs. The method includes: generating a wellbore stress prediction model based on in-situ stress, wellbore induced According to the percolation characteristics in the cracking fluid injection process, the seepage-stress crack initiation pressure prediction model is generated according to the stress prediction model around the well; The wellbore stress prediction model, the pressure prediction model, the flow dynamic distribution during the multi-fracture initiation process, the flow dynamic distribution during the multi-fracture expansion process, the fracture-induced stress generated by the extension of the perforation cluster that initiates the fracture first, and the formation Induced stresses generated by fluid pressure changes generate a multi-cluster perforation competitive crack initiation and propagation model. The invention can better improve the fracturing effect of segmented and multi-cluster unconventional reservoirs.
Description
technical field [0001] The invention relates to the technical field of exploration and development of oil and gas fields, in particular to the technical field of development of unconventional oil and gas fields, and in particular to a simulation method and device for multi-cluster perforation competitive crack initiation and expansion in unconventional reservoirs. Background technique [0002] Unconventional oil and gas resources have a large proportion of energy and have great potential for exploration and development. Unconventional oil and gas resources will become an important strategic replacement for conventional oil and gas resources in the future, and heterogeneity is the fundamental characteristic of unconventional reservoirs. Horizontal well staged multi-cluster fracturing is a key technology for the efficient development of unconventional oil and gas. Reservoir volume fracturing is realized through staged multi-cluster perforation fracturing and acidizing stimulat...
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IPC IPC(8): E21B43/26E21B43/116E21B49/00G06F30/20
CPCE21B43/26E21B43/116E21B49/00G06F30/20
Inventor 曾凡辉郭建春张宇张蔷
Owner SOUTHWEST PETROLEUM UNIV