不完全驱替条件下提高固井质量应用研究

Application research on improving cementing quality under incomplete displacement condition

摘要:

随着勘探开发的不断深入，超深井末开次固井中完井深已超过7400 m。地质结构复杂与井身结构多样化给固井带来了诸多质量控制难点，尾管固井均具有“二高一小一低”的特点 ，即易漏风险高、施工压力高、注替浆排量小、顶替效率低的特点，造成了固井期间浆体的不完全驱替。本文通过顺北油田固井技术应用实例，寻求在不完全驱替条件下提高固井质量的方法，达到提高该区块固井质量的目的，提高油井寿命。

Abstract:

With the deepening of exploration and development, the completion depth of the ultra-deep well during the final stage cementation has exceeded 7400m. The complex geological structure and variety of borehole structures bring many quality control difficulties for cementing. Liner cementing has the characteristics of “two highs, one small and one low”, that is, high risk of leakage, high working pressure, small displacement of slurry and low displacement efficiency, leading to incomplete displacement of slurry during cementing. Through a field case of application of cementing technology in Shunbei Oilfield, this paper investigates the method to improve the cementing quality under the condition of incomplete displacement, so as to improve the cementing quality in this block and increase the service life of oil wells.