一种新型完井液高温高压静态沉降稳定性评价方法

A New Method for Evaluating the Stability of High Temperature and High Pressure Static Settlement of Completion Fluids

摘要: 完井液体系高温高压下沉降稳定性的好坏直接关系到后续下管柱测试、再次开泵等作业的开展，目前国内外对完井液沉降稳定性的评价没有统一的方法，虽然国内外学者提出了近9种方法，然而没有能够直观动态展示完井液在高温高压条件下沉降时整浆密度的变化情况，本文提出高温高压沉降密度测试法，并基于室内评价实验，横向对比落棒法、针入式沉实度法、静态稳定分层指数法以及高温高压沉降密度测试法的测试结果，得出高温高压沉降密度测试法直观性好、可视化强，能够模拟高温高压条件下完井液静沉降时整浆密度随时间的变化，对评价完井液沉降稳定性具有更好的指导意义。

Abstract: The stability of the settlement of the completion fluid system under high temperature and pressure is directly related to the subsequent testing of the string and the reopening of the pump. Currently, there is no unified method for evaluating the settlement stability of the completion fluid at home and abroad. Although scholars at home and abroad have proposed nearly 9 methods, they have not been able to visually and dynamically display the changes in the density of the entire slurry during the settlement of the completion fluid under high temperature and pressure conditions. This article proposes a high temperature and high pressure settlement density testing method, and based on indoor evaluation experiments, compares the test results of rod drop method, needle penetration settlement method, static stability stratification index method, and high temperature and high pressure settlement density testing method horizontally. It is concluded that the high temperature and high pressure settlement density testing method has good intuitiveness and strong visualiza-tion, and can simulate the changes in the overall slurry density with time during the static settle-ment of completion fluid under high temperature and high pressure conditions. It has better guid-ing significance for evaluating the settling stability of completion fluids.