高压盐水层控压放水模拟计算研究  

Simulation Computation of Pressure-controlled Water Drainage in High-pressure Brine Layer

作　　者：张朝举[1] 李军[2] 杨宏伟 柳贡慧 刘金璐 邓昌松[3] ZHANG Chaoju;LI Jun;YANG Hongwei;LIU Gonghui;LIU Jinlu;DENG Cangsong(Sinopec Southwest Petroleum Engineering Co.Ltd,Chengdu,Sichuan 610000,China;College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;Petro China Tarim Oilfield Company,Korla,Xinjiang 841000,China)

机构地区：[1]中国石化西南石油工程有限公司 [2]中国石油大学石油工程学院(北京) [3]中国石油塔里木油田公司

出　　处：《钻采工艺》2021年第3期1-4,共4页Drilling & Production Technology

基　　金：国家自然科学基金重点项目“深水油气钻采井筒压力控制基础研究”(编号:51734010);中国石油大学(北京)科研基金(编号:2462020XKBH011)联合资助。

摘　　要：控压放水工艺是解决高压盐水层钻进难题的关键技术,对该技术进行理论研究具有重要意义。文章根据实际情况给出了地层盐水流动及渗流机理,基于多相多组分流动理论及地层渗流理论,建立了控压放水多相流模型,使用有限差分法对模型进行迭代求解。以克深X井为例,使用模型模拟了控压放水过程中各参数的变化趋势,对模拟结果中的套压、排水量、地层压力当量密度等参数进行了分析。地层压力当量密度由2.58g/cm^(3)降低至2.40g/cm^(3),预测结果与现场实验数据基本一致,研究结果表明,井口节流管汇系统的承压极限是制约单次排水量的主要因素,因此需要控压、控量、多次放水;整个放水过程中,初始阶段的地层压力降低速率较快;随着排水量的增加,地层压力逐渐趋于稳定,当地层压力波传播到含水透镜体边界后,地层压力又开始近似线性降低。此研究可以为控压放水的现场作业提供良好的理论指导。The pressure-controlled water drainage technology is the key technology to solve the drilling challenges in high-pressure brine layers,so it’s significant to study the technology theoretically.According to the actual situation,the formation brine flow and seepage mechanism are given.Based on the theory of multiphase and multi-component flow and formation seepage theory,a multiphase flow model of pressure-controlled water drainage is established,and the finite difference method is used to solve the equation iteratively.Taking Well Keshen X as an example,the model is used to simulate the variation trend of various parameters in the process of pressure-controlled drainage,and the parameters such as casing pressure,displacement and equivalent density of formation pressure in the simulation results are analyzed.Formation pressure equivalent density is decreased from 2.58 g/cm3 to 2.40 g/cm3,which is consistent with the field experimental data.The results of the case analysis show that the pressure limit of the throttling manifold system at the wellhead is the main factor affecting the single displacement,so pressure control,volume control and multiple water release are required in the process.In the whole process of drainage,formation pressure decreases faster in the initial stage,and then gradually tends to be stable with the increase of displacement.After the local pressure wave propagates to the boundary of the water-bearing lens,the formation pressure begins to decrease approximately linearly.This study can provide theoretical guidance for the field operation of controlled pressure water drainage.

关 键 词：高压盐水层 控压放水 多相流 有限差分法 

分 类 号：TE24[石油与天然气工程—油气井工程]