胜利油田海水钻井液技术的形成与发展

Seawater drilling fluid technology in Shengli Oilfield-its forming and development

胜利石油管理局海洋钻井公司23年来,在渤海湾4870 km2的海域内,已打井348口,完成钻井进尺737866m。在钻井实践中海水钻井液技术的形成过程为:1978-1985年为海水钻井液技术发展的初期,由于钻井液处理剂使用针对性不强,井下复杂情况较多;1985年至1988年使用淡水钻井液,为了打好探井,避免沥青类产品对地质荧光录井的影响,研制成功了MHP无荧光防塌剂,保证了荧光录井和固井质量,稳定了井壁,保护了油气层;1990年至今采用以PAC141为主处理剂的海水低固相不分散钻井液,钻井施工顺利,井身质量、固井质量合格,负压投产一次成功,表皮系数低,堵塞比小,LC50值大于10000 mg/L,达到了环境保护的要求。随着科学技术的发展,保护环境,保护油气层,适应恶劣的钻井条件,是今后新型海水钻井液的主攻方向。

A total of 348 wells and an overall footage of 737,866 m have been drilled by the Offshore Company of Shengli over the 23 years. Its history of using sea water drilling fluid technology in offshore drilling can be divided into several stages. The first stage was from 1978-1985, the early days of using seawater drilling fluid. Many downhole troubles were encountered during this stage because of improper use of mud additives. Form 1985 to 1988, fresh water drilling fluid was used, and MHP non-fluorescence sloughing control agent was developed for exploratory well drilling. It was good for mud logging and hole stability, and it improved cementing quality and protected formation. Since the year of 1990, low solids and non-dispersing seawater drilling fluid, with PAC-141 as the main additive has been used. By using this seawater system, drilling operations were smoothly carried out, and regular borehole, good cementing quality were achieved. At the same time, the skin factors and blocking ratio were low, and the value of LC50 was over 10,000 mg/L, which met the requirements of pollution control. The direction on R&D of novel seawater drilling fluid technology was proposed.