Special Oil & Gas Reservoirs >

2022 , Vol. 29 >Issue 2: 149 - 156

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.02.022

Drilling & Production Engineering

Research and Practice of SRV Fracturing Technology for Inter-salt Shale Oil

  • Liu Honglei ,
  • Xu Shengqiang ,
  • Zhu Biwei ,
  • Zhou Linbo ,
  • Huang Yajie ,
  • Li Baolin
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  • 1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100101, China;
    2. Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China;
    3. PetroChina Yumen Oilfield Company, Jiuquan, Gansu 735000, China;
    4. Sinopec Jianghan Oilfield Company, Wuhan, Hubei 430035, China

Received date: 2021-01-18

  Revised date: 2021-10-11

  Online published: 2023-01-10

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Abstract

The inter-salt shale oil reservoirs are characterized by unclear creep characteristics of the upper and lower salt rocks, susceptibility to interference with the upper and lower plastic rocks during fracturing, multiple lithological components, complex sensitivity, poor pore connectivity, and unclear dissolution pattern of soluble salts. There are more stringent requirements for SRV fracturing due to reservoir characteristics. For efficient development of inter-salt shale oil, Well BYY1HF in Paleogene inter-salt shale oil reservoir, Qianjiang Sag was tested with such technologies as CO2 enhanced composite fracturing, acid-resistant fracturing fluid plus sanding, dense cutting plus forced-sanding fracturing, and temporary plugging fracturing with ball casting. CO2 enhanced composite fracturing had the advantages of increased flowback capacity, improved matrix porosity and permeability, strong penetration, and high flowback rate. The acid-resistant fracturing fluid system could maintain stable performance, strong sand carrying capacity and low damage to reservoirs in acidic environment (pH 2-6). The dense cutting plus forced-sanding fracturing technology could eliminate the "agglomeration effect", promote the uniform opening and propagation of each cluster of fractures, and improve the SRV fracturing effect. The construction results showed that the technical system was advantaged by enhancing the flowback capacity, improving the porosity and permeability of the reservoir, promoting the rock capacity of fracturing initiation, fracture complexity, etc., and improving the oil supply capacity of the matrix to a certain extent. The test of fracturing technology is of great significance in reference for the large-scale fracturing transformation of inter-salt shale oil.

Key words： inter-salt shale oil; acid-resistant fracturing fluid; CO2 complex SRV fracturing; dense cutting; temporary plug steering; Qianjiang Sag

Cite this article

Liu Honglei , Xu Shengqiang , Zhu Biwei , Zhou Linbo , Huang Yajie , Li Baolin . Research and Practice of SRV Fracturing Technology for Inter-salt Shale Oil[J]. Special Oil & Gas Reservoirs, 2022 , 29(2) : 149 -156 . DOI: 10.3969/j.issn.1006-6535.2022.02.022

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