Models for Conductivity and Productivity of Hydraulic Fractures in Tight Oil Reservoirs in Sedimentary Rocks

doi:10.7657/XJPG20230408

Abstract

Abstract:

In order to clarify the variation in the conductivity of different types of sedimentary rocks after fracturing, post-frac conductivity tests were conducted on the sedimentary rocks such as turbidite, beach-bar sandstone, and sandy conglomerate to identify the relationship between lithology and conductivity, and a conductivity model was constructed. The conductivity model was then incorporated into the primary fracture pressure control equation to obtain an analytical solution for primary fracture pressure. A semi-analytical model for predicting the productivity of multi-stage fractured horizontal wells was developed by using the distributed volume source method. The new productivity model was applied to the tight oil reservoirs in the Chaoyanggou oilfield in the periphery of Changyuan, Daqing. It is found that the calculation errors from a numerical model, a productivity model without considering lithology and the new productivity model considering lithology are 6.5%, 22.7% and 4.6%, respectively. The new model focuses on the impact of different sedimentary rock lithologies on productivity, which can improve the accuracy of productivity prediction for tight oil reservoirs.

Key words: Chaoyanggou oilfield, tight oil reservoir, multi-stage fracturing, lithology analysis, long-term conductivity, productivity model, horizontal well development, volume source method

CLC Number:

TE33

WANG Xiaobing, HU Yanshe, LI Sen, CHEN Min, WANG Lu, ZHU Chenyang. Models for Conductivity and Productivity of Hydraulic Fractures in Tight Oil Reservoirs in Sedimentary Rocks[J]. Xinjiang Petroleum Geology, 2023, 44(4): 442-449.

Figures/Tables 11

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岩性		石英含量	长石含量	岩屑含量
砂砾岩	粉细砂岩	35.1	34.3	30.6
	含砾砂岩	18.9	30.4	50.7
	砾质砂岩	20.8	25.4	53.8
	砾状砂岩	19.3	22.4	58.3
浊积岩		33.4	38.1	28.5
滩坝砂		68.9	11.4	19.7