Sensitivity Analysis of Mechanical Parameters of Collapse Roof of Carbonate Rock Deep Buried Oilfield

Yanzhi Ding, Qiangyong Zhang (), Wen Xiang, Xinrui Lyu and Longyun Zhang
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Yanzhi Ding: Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China
Qiangyong Zhang: Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China
Wen Xiang: School of Civil Engineering, Shandong University, Jinan 250061, China
Xinrui Lyu: Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
Longyun Zhang: Logistics Department, Shandong University, Jinan 250100, China

Energies, 2023, vol. 16, issue 10, 1-16

Abstract: Carbonate rock oilfields account for two-thirds of proven marine carbonate oilfield reserves, which are the primary way to increase future oil and gas energy reserves. Cave collapses occur during the process of oil reservoir development, seriously affecting oil production. In order to reveal the collapse failure mechanism of carbonate karst caves and predict whether the fracture cave type oil reservoir will collapse before drilling, a binary depth reduction method for determining the critical collapse depth of karst caves is proposed based on the Tahe fracture cave type oil reservoir. The sensitivity of karst cave collapses to multiple factors is analyzed, and a prediction formula for the critical collapse depth of karst caves with changes in the deformation modulus, the internal friction angle, and the cohesion is established through multiple regression analysis. By calculating and analyzing the numerical values of a large number of operating conditions under different mechanical parameters, the failure process, failure mode, and the change law of collapse depth during the Tahe oilfield destruction process were obtained. We used the established formula for predicting the collapse depth of karst caves to predict and analyze the actual distribution of karst caves in the Tahe oilfield. The calculation and analysis results showed that in the karst cave failure mode characterized by vertical shear failure, the cohesive force is the most sensitive factor affecting cave collapse, followed by the internal friction angle. The deformation modulus is hardly sensitive to the influence of the karst collapse. Through the geomechanical model test, the result verified the accuracy and reliability of the calculation results. The research results will provide necessary theoretical support for the large-scale safe extraction of deep petroleum resources, increase oil production in China, and have important theoretical significance and engineering application value.

Keywords: deep oilfield cave; roof collapses; analysis of mechanical parameters’ sensitivity; critical collapse depth; geomechanical model test (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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