海洋钻井中常用钻井液体系及其应用

COMMON DRILLING FLUID SYSTEMS AND THEIR APPLICATION IN OFFSHORE DRILLING

简述了海洋钻井中常用的4种钻井液体系,其中改进型PEC钻井液体系具有软抑制、低粘高切的特点宜适用于海洋钻井上中部地层;PEM钻井液体系具有抑制、防塌、润滑、抗温性强的特点宜适用于海洋钻井的中深部地层及大位移和水平井;EZFLOW钻井液体系具有携砂能力强、油层保护好、抗污染能力强的特点宜适用于海洋钻井中大位移井、水平井及油层保护;隐形酸完井液体系具有油层保护及抗腐蚀能力强的特点,宜适用于海洋钻井中完井作业。介绍了4种钻井液体系在海洋钻井应用取得的效果。

Four kinds of drilling fluid systems commonly used in offshore drilling are briefly described in this paper.Among them,the improved PEC drilling fluid system has the characteristics of soft inhibition,low viscosity and high cut,which is suitable for the upper and middle strata of offshore drilling.The PEM drilling fluid system has the characteristics of inhibition,anti-collapse,lubrication and temperature resistance,which is suitable for the middle and deep strata of offshore drilling and the extended displacement and horizontal wells.EZFLOW drilling fluid system has the characteristics of strong sand carrying ability,good reservoir protection and strong anti-pollution ability,which is suitable for large displacement wells,horizontal wells and oil reservoir protection in offshore drilling.The invisible acid completion fluid system has the characteristics of strong reservoir protection and corrosion resistance,which is suitable for the completion of offshore drilling.The paper also introduced the effects achieved by these four drilling fluid systems in offshore drilling applications.