西南石油大学学报(自然科学版)

• 石油与天然气工程 • 上一篇    下一篇

安塞地区加密井地层压力预测研究

王勇茗1,2 *,吴学升1,2,周文军1,2   

  1. 1. 中国石油长庆油田公司油气工艺研究院,陕西西安710018;2. 低渗透油气田勘探开发国家工程实验室,陕西西安710018
  • 出版日期:2016-08-01 发布日期:2016-08-01
  • 通讯作者: 王勇茗,E-mail:wyongm_cq@petrochina.com.cn
  • 基金资助:

    国家自然科学基金(51274168)。

Research on Formation Pressure Predictionin in Ansai Area Infilling

WANG Yongming1,2*, WU Xuesheng1,2, ZHOU Wenjun1,2   

  1. 1. Research Institute of Oil and Gas Technics,ChangQing Oilfield Company,PetroChina,Xi′ an,Shaanxi 710018,China
    2. State Project Laboratory of Low permeability Oil and Gas Exploration and Development,Xi′ an,Shaanxi 710018,China
  • Online:2016-08-01 Published:2016-08-01

摘要:

安塞油田王窑加密试验区位于王窑区块中西部,开发时间较长,综合含水58.9%,地质储量采出程度11.8%,
地层压力系统紊乱,且同时存在天然裂缝和压裂裂缝,加密试验井地层压力预测难度大,安全钻井风险高。在分析安
塞加密试验区地质特征的基础上,针对注水过程中地层压力与原始地层压力差异较大,且经过注水后的地层压力分布
难以准确确定的问题,将裂缝性地层渗流理论引入到注水后地层压力预测过程中,给出了复杂裂缝地层加密井地层渗
透率的张量计算方法和加密井地层压力预测方法,对安塞试验区加密井地层压力进行了预测,预测结果精度较高,能
够满足确定安全钻井液密度窗口的需要;并分析了裂缝特征对加密井地层压力的影响,可为加密井安全钻井提供实际
指导。

关键词: 安塞油田, 加密井, 地层压力, 安全钻井, 密度窗口

Abstract:

Ansai Oilfield infill experimental zone is located in the mid-west Wangyao zone. After long-time development,the
composite water cut reaches 58.9%,geological reserves recovery degree 11.8%;formation pressure system is in disorder,and
natural fracture and fracture cracks co-exist. Therefore,the prediction of formation pressure of encryption test wells is difficult
and drilling safety is at risk. Based on the analysis of Ansai experimental area and on the basis of geological characteristics,we
studied the difference between formation pressure in the process of water injection and the original formation pressure,trying
to accurately determine reservoir pressure distribution water after injection. We introduced the seepage theory of fractured
formation after water injection in the process of the formation pressure prediction,and suggest calculation method for infilled
wellbore formation permeability tensor of complex crack formation and prediction methods for infilling of formation pressure.
Applying these methods to the prediction of formation pressure of experimental zone in Ansai produced highly accurate results
that satisfy the need of safe drilling fluid density window The influence of the characteristic of cracks on infill well formation
pressure is also analyzed,which can provide practical guidance for infill well drilling safety.

Key words: Ansai Oilfield, infill well, formation pressure, safe drilling, density window

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