Method for simulating horizontal well staged fracturing fracture expanding track
A technology of staged fracturing and fracture propagation, used in earth-moving drilling, wellbore/well components, production fluids, etc.
Active Publication Date: 2017-04-26
SOUTHWEST PETROLEUM UNIV
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[0003] The existing fracture propagation simulation techniques for horizontal wells assume that hydraulic fractures are straight fractures in advance, which is quite different from the actual situation of the fracture propagation trajectory in staged fracturing of horizontal wells. The induced stress generated by the loss will change the in-situ stress field, causing the subsequent hydraulic fracturing fractures to continuously turn during the expansion and extension process, so that the fractures formed by subsequent fracturing will bend instead of being a vertical fracture to the wellbore
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[0093] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0094] see figure 1 , an embodiment of the present invention provides a method for simulating the growth trajectory of fractures in staged fracturing of a horizontal well, comprising the following steps:
[0095] S100 collects reservoir, fracture and fracturing operation parameters.
[0096] S200, based on the collected parameters, establish a hydraulic fracture induced stress field model.
[0097] S300 is to combine the hydraulic fracture induced stress field model and apply the stress intensity factor theory to establish a hydraulic fracture propagation trajectory model of the horizontal well.
[0098] In this embodiment, the collected parameters include three-dimensional principal stress, reservoir thickness, porosity, Poisson's r...
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The invention discloses a method for simulating a horizontal well staged fracturing fracture expanding track and belongs to the field of oil and gas reservoir exploitation. The method comprises the following steps that the reservoir stratum, fracture and fracturing construction parameters are collected; a hydraulic fracture induced stress field model is established based on the collected parameters; and a horizontal well hydraulic fracture expanding track model is established through application of the stress intensity factor theory according to the hydraulic fracture induced stress field model. According to the method for simulating the horizontal well staged fracturing fracture expanding track, influence of induced stress generated by the well shaft inner pressure, a prior fracturing fracture and fracturing fluid loss on the subsequent hydraulic fracture expanding track is fully considered, and the horizontal well staged fracturing fracture expanding track can be simulated quantitatively and veritably.
Description
technical field [0001] The invention relates to the field of oil and gas reservoir development, in particular to a method for simulating the expansion trajectory of fractures in staged fracturing of horizontal wells. Background technique [0002] Staged fracturing of horizontal wells is a key technology for industrial development of low-permeability oil and gas reservoirs. [0003] The existing fracture propagation simulation techniques for horizontal wells assume that hydraulic fractures are straight fractures in advance, which is quite different from the actual situation of the fracture propagation trajectory in staged fracturing of horizontal wells. The induced stress generated by the loss will change the in-situ stress field, causing the subsequent hydraulic fracturing fractures to continuously turn during the expansion and extension process, so that the fractures formed by subsequent fracturing will bend instead of being a vertical fracture to the wellbore. Therefore, ...
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Inventor 曾凡辉唐波涛郭建春王小魏陶亮程小昭
Owner SOUTHWEST PETROLEUM UNIV