四川固井技术

WELL CEMENTING TECHNOLOGY FOR SICHUAN REGION

四川地区的固井技术主要是针对碳酸盐岩裂缝性气藏表现出的压力层系多 ,各层压力系数相差大 ;地层压力高、含硫化氢高 ,井深等地质特点而进行的。经几十年的努力 ,形成了具有特色且行之有效的复杂地质条件下的防气窜、施工设计、注水泥工艺、工具、水泥浆外加剂及试验方法、地面施工技术等 ,解决了一系列的生产技术难题 ,推动了四川固井技术进步。文章介绍了四川地区深井固井中常见的低压漏失井、高压气井的固井工艺及相关的配套技术。以及泥浆转化为固井液 (MTC)技术开发应用的情况和大斜度井、长封固段和小井眼短套管柱尾管固井的成功经验。文章还介绍了四川地区地面施工技术 ,该项技术的应用 ,保证了工艺措施的有效实施和固井质量。

The well cementing technology for Sichuan region is mainly aimed at the fractured carbonate gas reservoirs which are characterized by the multiple pressure systems,the greatly different pressure coefficient among the beds,the high formation pressure,the high content of H 2S and the great well′s depth,etc.Through efforts for tens of year,the anti-gas-channelling cementing technology and tools,the cement slurry additives and their test methods and surface operation technique,etc.which are of characteristics and are effective under the complex geological condition have been formed,solving a series of diffcult technical problems and promoting the progress in well cementing technology in Sichaun.In this paper,the well cementing technology and relative technique for the low-pressure absorption wells and high-pressure gas wells met frequently in deep well cementing in Sichuan region,the development and application situation of mud to cement and the successful experiences in the well cementing for high-angle well,long cementing interval and slim-hole short casing string are presented,and the operation technique in Sichuan region is presented also.The application of this technique makes the technological measures be effectively carried out and the well cementing quality be ensured.