China Petroleum Exploration ›› 2019, Vol. 24 ›› Issue (2): 260-266.DOI: 10.3969/j.issn.1672-7703.2019.02.015

• PETROLEUM ENGINEERING • Previous Articles    

Infill-well volume fracturing of tight oil reservoirs in Santanghu Basin

Xiang Hong1, Wang Zhiping2, Shen Yong1, Liu Zhi1, Dou Rui1   

  1. 1 Research Institute of Engineering Technology, PetroChina Tuha Oilfield Company;
    2 Lukeqin Oil Production Plant, PetroChina Tuha Oilfield Company
  • Received:2018-09-09 Revised:2019-03-02 Online:2019-03-15 Published:2019-03-15
  • Supported by:
     

Abstract: In Block Ma 56 of the Santanghu Basin, a large quantity of tight oil in place remains unrecovered after stimulated by horizontal well volume fracturing, suggesting an overall recovery of only 3%. A considerable volume of remaining oil near wells and in fractures can be developed. In order to further improve the single-well productivity and recovery, the practices of volume fracturing of tight oil reservoirs around the world were reviewed. On this basis, a technology of densely-spaced wells + partitioned volume fracturing was proposed under the guidance of geological and engineering integration, that is, the densities of both well pattern and induced fractures are increased to ensure the wellbore and fracture system to cover all reserves in the reservoir, so that the reservoir productivity can be maximized. Moreover, five supporting techniques were developed, i.e. well infilling, long horizontal section drilling, partitioned and staggered fracture initiation, water injection, and low-cost volume fracturing. Application in 41 wells shows the effective rate is up to 100%, the average daily oil production per well is 26.2 tons, and the cumulative oil production increases by 39.7%. The technology is helpful to improving single-well productivity and recovery of tight reservoirs in Block Ma 56.

 

Key words: tight reservoir, infill well, volume fracturing, Block Ma 56, oil recovery

CLC Number: