Study on the Acid Fracturing Technology for High-inclination Wells and Horizontal Wells of the Sinian System Gas Reservoir in the Sichuan Basin

doi:10.11885/j.issn.1674-5086.2017.07.03.01

Abstract

Abstract: The carbonate rock reservoir of the Dengying subgroup of the Sinian System in the Sichuan Basin is characterized by complex types of reservoir spaces as a result of its well-developed dissolution pores, fractures, and holes, and it is characterized by high buried depth, high temperature, high pressure, high heterogeneity, and high contents of such acid gases as H₂S and CO₂. These features and characteristics present challenges to the current reservoir reform processes. The key to reservoir reform for high-inclination and horizontal wells is the deployment of acid liquid and in-depth permeation of acid dissolution fractures in long well sections to link the natural fractures and pores in the reservoir into a connected system. The current reservoir reform processes with mechanical stratification and segmentation for high-inclination/horizontal wells were improved in light of the geological characteristics and geostress distribution patterns as follows. open-hole sections with a big difference between vertical layers or horizontal segments in physical properties were reformed with packers in a segment-by-segment manner, while perforation segments with a big intralayer or intrasegmental difference in physical properties were reformed with degradable filling materials in a layer-by-layer manner. Fracture-hole-type reservoirs with well-developed natural fractures and holes were reformed with retarded-acid based acid fracturing technology to link the fractures and holes into a connected system, while fracture-pore-type and pore-type reservoirs were reformed with pad-fluid-based acid fracturing technology to form deep acid dissolution fractures to link isolated fractures and pores into a connected system. As demonstrated by on-site tests, the two types of acid fracturing technology developed for high-inclination and horizontal wells can improve reservoir reform efficiency. An exploratory study was also conducted on self-generating acid and slick water-based acid fracturing technology for complex networks of fractures, with some degree of success in improving reservoir reform efficiency.

Key words: Sichuan Basin, Dengying Formation, carbonate rock, high-inclination wells and horizontal wells, deep acid fracturing, stratification segmentation

CLC Number:

TE371

LI Song, MA Huiyun, ZHANG Hua, YE Jiexiao, HAN Huifen. Study on the Acid Fracturing Technology for High-inclination Wells and Horizontal Wells of the Sinian System Gas Reservoir in the Sichuan Basin[J]. 西南石油大学学报(自然科学版), 2018, 40(3): 146-155.

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