海上“双高”油田强化开采调控方法及应用

The Method and Application of Enhanced Exploitation Control for Offshore Oilfield with High Water Cut and High Recovery Degree

康凯 吴金涛 刘斌 卢美月 龚小龙

KANG Kai WU Jintao LIU Bin LU Meiyue GONG Xiaolong

中海石油（中国）有限公司天津分公司，天津　300459

CNOOC (China) Tianjin Branch, Tianjin 300459, China

针对渤海Q油田进入高含水率、高采出程度“双高”阶段的稳产难题，提出了强化开采调控方法，通过合理提高生产压差，提高层内水驱动用程度。基于对层内非均质性以及驱动压力梯度与启动压力梯度的关系分析，从低渗透率储层有效动用的角度出发，建立了不同井距下合理生产压差与流度的关系图版。应用该图版，提出渤海Q油田生产压差从2.0 MPa提高至5.0 MPa。该方法在渤海Q油田取得较好的成效，单井“降水增油”效果明显，实现日产量连续5年稳产200 m3/d，油田采收率提高4%。该方法能为后续油田开发提供借鉴。

Aiming at the problem of stable production in the "double high" stage of Bohai Q Oilfield entering high water cut and high recovery degree, the method of enhanced exploitation control is proposed to improve the water driving level in the layer by reasonably increasing the production pressure difference. Based on the analysis of the heterogeneity in the layer and the relationship between the driving pressure gradient and the threshold pressure gradient, from the perspective of the effective driving of low permeability reservoirs, the relationship between the reasonable production pressure difference and the mobility under different well spacings is established. Applying this relationship, it is proposed that the production pressure difference of Bohai Q Oilfield will increase from 2.0 MPa to 5.0 MPa. This method has achieved good results in Bohai Q Oilfield. The effect of single well "precipitation and oil increase" is obvious. The daily production is stable at 200 m3/d for 5 years and the oil recovery ratio is increased by 4%.This method can provide reference for subsequent oilfield development.

https://doi.org/10.3969/j.issn.1008-2336.2022.03.041