Efficient Development Technologies for Tight Oil in Tuffite Reservoirs in Tiaohu Formation of Santanghu Basin

doi:10.7657/XJPG20200612

Abstract

Abstract:

The tight oil in the tuffite reservoir of Tiaohu formation in Santanghu basin is distributed stably. The reservoir is characterized by medium to high porosity, ultra-low permeability and high oil saturation and developed natural fractures. Based on the achievements of tight oil exploration in the study area in recent years, technical problems related to efficient development were analyzed. It was found that the technology system of horizontal well plus volume fracturing could stimulate the overall producing of reserves, but the production decline was fast, the primary recovery was low and the development benefit was poor. Finally several technologies were proposed, such as cyclic water injection for rapidly replenishing formation energy, infill wells for reducing well spacing and expanding fracture controlled reserves. After well pattern infilling, cyclic water injection in individual wells was converted to well-group water flooding. Finally, the oil production has been improved in many wells, the recovery has been increased from 2.5% to 10.2%, and the production rate has been kept at 1.0%. Efficient and profitable reservoir development has been realized. The results can be references for developing similar tight reservoirs.

Key words: Santanghu basin, Permian, Tiaohu formation, tuffite, tight oil, geological characteristic, efficient development, key technology

CLC Number:

TE341

YU Jiayi, LI Daoyang, HE Bobin, XIE Shijian. Efficient Development Technologies for Tight Oil in Tuffite Reservoirs in Tiaohu Formation of Santanghu Basin[J]. Xinjiang Petroleum Geology, 2020, 41(6): 714-720.

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