起下钻引发的环空瞬态波动压力计算方法  

Improved Calculation of Transient Surge Pressure in Wellbore while Tripping Operations

作　　者：赵岩龙 任传杰 冯智 祝宏平 米翔 尹俊轩 ZHAO Yan-long;REN Chuan-jie;FENG Zhi;ZHU Hong-ping;MI Xiang;YIN Jun-xuan(China University of Petroleum Beijing at Karamay, Karamay 834000, China;China University of Petroleum (Beijing), Beijing 102249, China;Operation Area of Shixi Oilfield, PetroChina Xinjiang Oilfield Company, Karamay 834000, China)

机构地区：[1]中国石油大学(北京)克拉玛依校区石油学院,克拉玛依834000 [2]中国石油大学(北京)石油工程学院,北京102249 [3]中国石油天然气股份有限公司新疆油田分公司石西油田作业区,克拉玛依834000

出　　处：《科学技术与工程》2022年第13期5198-5204,共7页Science Technology and Engineering

基　　金：国家自然科学基金青年科学基金(52004301);新疆维吾尔自治区自然科学基金(2020D01B65);中国科学院“西部青年学者”(2021-XBQNXZ-033)。

摘　　要：准确计算并预测井筒波动压力对保证钻井安全至关重要。通过井筒流道分析,建立了井筒环空瞬态波动压力计算模型,采用特征线法进行数值求解,获得了环空波动压力值及波动压力的时间分布特征。以现场一口井为基础数据进行下钻过程计算。结果表明:压力波以弹性波的形式在井筒流道内进行传播;随着钻杆运行速度的增加,环空中瞬态波动压力增加。现场钻井作业过程中,在保证钻井安全的前提下,可通过降低钻井液密度、减小起下钻速度以减小瞬态波动压力的影响。Accurate calculation and prediction of wellbore transient surge pressure is essential to ensure drilling safety.Through the analysis of the wellbore flow path,a calculation model of the transient surge pressure in the wellbore annulus was established.The characteristic line method was used for numerical solution,and the transient surge pressure value and the time distribution characteristics of the transient surge pressure in the annulus could be obtained.The calculation results of the drilling process based on the data of a well on site show that the pressure wave propagates in the wellbore flow channel in the form of elastic wave.As the operating speed of the drill pipe increases,the transient surge pressure in the annulus increases.During on-site drilling operations,under the premise of ensuring drilling safety,the impact of transient pressure fluctuations can be reduced by reducing the density of the drilling fluid and the tripping speed.

关 键 词：瞬态波动压力 偏微分方程 特征线法 钻井工程 

分 类 号：TE21[石油与天然气工程—油气井工程]