摘要
X油田为海上强底水油藏,由于海上开发开采的特殊性,为了油田保持高速开发,海上平台井槽有限,对于高含水但还有剩余油的井,有必要采用保留原井眼侧钻的方式,即原井眼暂时封堵压锥,侧钻至未动用区域,等一定时间后再进行原井眼开采,来保持产量最大化。同时为了满足高效开发的要求,部分井在还有剩余油的情况下,进行保留原井眼侧钻,而何时再打开原井眼,需要准确掌握关井后水锥的回落状况。本文利用油藏工程分析方法和数值模拟技术,在对底水油藏水锥回落规律影响因素分析的基础上,建立了底水油藏数值模型,研究油密度、油黏度、油层厚度、隔夹层、水平渗透率、垂向渗透率与水平渗透率比值等因素对关井后水锥回落高度的影响规律,得出不同因素下回落高度与关井的关系,为关井压锥提供参考,同时为保留原井眼的调整井制定开关井策略。
X oilfield is an offshore strong bottom water reservoir. Because of the particularity of offshore development and exploitation, in order to maintain high-speed development of the oilfield, offshore platform wells are limited. For wells with high water cut but remaining oil,it is necessary to retain the original wellbore sidetracking, that is, temporarily plugging the pressure cone in the original wellbore, sidetracking to the unused area, and then carrying out the original wellbore exploitation after a certain period of time to maintain the maximum production. At the same time, in order to meet the requirement of efficient development,some wells need to retain the original wellbore sidetracking in the case of remaining oil, and when to open the original wellbore, it is necessary to accurately grasp the water cone drop after shut-in. Based on reservoir engineering analysis and numerical simulation technology,this paper establishes a numerical model of bottom water reservoir on the basis of analyzing the influencing factors of water cone fall law of bottom water reservoir, and studies the effects of oil density, oil viscosity, reservoir thickness, interlayer, horizontal permeability, ratio of vertical permeability to horizontal permeability on water cone fall height after shut-in. The relationship between fall height and shut-in can provide reference for shut-in and cone killing, and formulate shut-in strategy for adjustment wells retaining original wellbore.
作者
谭捷
TAN Jie(Bohai Oilfield Research Institute,Tianjin Branch of CNOOC Ltd.,Tianjin 300452,China)
出处
《石油化工应用》
CAS
2019年第12期11-14,25,共5页
Petrochemical Industry Application
基金
“十三五”国家科技重大专项“渤海油田高效开发示范工程”，项目编号：2016ZX05058
关键词
底水油藏
关井压锥
回落高度
预测模型
bottom water reservoir
shut-in coning
back-off height
prediction model
