拟瞬态井内波动压力预测模型

本文基于对井内瞬态波动压力预测模式中的影响因素的敏感性分析,及近几年对井内波动压力理论和全尺寸井实测研究,提出了新的预测井内波动压力的“瞬态化的稳态”预测模型．该模型考虑了井内流体的压缩性、流道弹性、运动管柱底端空井眼长度和运动管柱纵向应变及惯性力影响。该模型预测值比目前广为应用的稳态模型预测值更接近并内实际波动压力值,这将有助于井身结构设计的科学性、钻井液密度确定和井下复杂事故的控制。

A Prediction Model for Quasi-Momentary State Well Fluctuation Pressure

Basing on the sensitive analysis of the influence factors in the prediction model of well momentary fluctuation pressure,and the study of well fluctuation pressure and the actual measurement of a full size well, a new prediction model is proposed to predict “the momentary state processing steady state” of the well fluctuation pressure. The model takes into account the influence of fluid compressibility, flow channel elasticity, the empty bottom hole distance under the moving pipes and their longitudinal strain and inertial force.The model can prediet the actual fluetuation pressure value more accurately than the now widely used steady state model,which will be helPful to the scientific hole structure design,the determination of drilling fluid density and the control of the complex problems in a hole.