Water Injection Development Strategies for the Reservoirs of Xishanyao Formation in

doi:10.7657/XJPG20200613

Abstract

Abstract:

The reservoirs of Xishanyao formation in Niujuanhu block of Santanghu oilfield are sandstone reservoirs with the characteristics of low permeability, low pressure and low mobility. In the early stage of development, there were problems such as poor water injection effects, low production of oil wells, and etc. In order to improve development effects of water injection, through the analysis of production performance statistics and the study on reservoir engineering and simulation methods, the technical and strategic limits for water injection were redefined, and the moderately advanced water injection was implemented. Meanwhile, reasonable well patterns and well spacing were discussed, the adjustment and the infilling in well patterns were implemented, and the favorable areas were depicted to prepare for rolling production. After the implementation of a series of strategies, the water injection development status for the reservoirs of Xishanyao formation in Niujuanhu block has gradually become better. At present, the reservoir pressure stays stable, the water content is controlled within 55%, and the natural decline rate of oil production drops to about 10%. The oil production remains stable and the maximum oil production rate can reach as high as 1.04%, which is still above 0.70% currently. It is predicted that the oil recovery rates of the southern and eastern areas of the reservoir in Xishanyao formation in the Niujuanhu block are 24.5% and 18.1%, respectively, both of which are higher than 18.0% calibrated in the development plan.

Key words: Santanghu oilfield, Niujuanhu block, Xishanyao formation, sandstone reservoir, advanced water injection, water injection intensity, layered water injection, well pattern infilling, rolling production

CLC Number:

TE341

PAN Youjun, XIE Jun, MENG Pengfei, YANG Zhen, YANG Yongxia. Water Injection Development Strategies for the Reservoirs of Xishanyao Formation in[J]. Xinjiang Petroleum Geology, 2020, 41(6): 721-728.

Figures/Tables 8

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开发阶段	开发技术	注水理念	压力系数	注水强度/ [m³·（d^-1·m^-1）]	注水量/ （m³·d^-1）	注采比	注水方式	注水压力/MPa	增产方式
开发初期	超前注水、提升压力、压裂投产	强化注水	1.00~1.40	3.0~6.0	50~100	5.0~10.0	未避射油干层, 笼统注水	大部分井超破压注水	注水见效
优化调整	超前注水、提升压力、压裂投产	温和注水	1.00	1.5~2.5	10~30	1.5~3.0	避射油干层, 实施分注	严格控制超破压注水	注水见效、重复（转向）压裂、热化学解堵