摘要
南阳油田的浅层稠油分布面积大,深度一般为200～1000 m,常温下稠油粘度为9050～52000 mPa·s,钻井中井漏、井壁坍塌时有发生,钻井液密度难以控制,固井合格率一直在80%左右,优良率不到60%,固井质量严重影响了油田的产能建设和合理开发.经过对浅层稠油井固井技术的研究、试验,形成了一套适合于浅层稠油井固井的工艺技术措施和水泥浆体系.一般情况下,采用密度为1.90 g/cm3加砂双凝水泥浆体系,该体系性能满足了稠油井低温固井、后期高温注蒸汽开采作业的特殊要求;在30 ℃左右时,长段水泥浆稠化时间控制为90～120 min,短段为50～60 min,失水量小于50 Ml.经现场应用表明,该体系在南阳古城和井楼地区共固稠油井70余口,平均井深为400 m,水泥浆全部返至地面,固井质量合格率达96%,优良率达82%,取得了好的效果.
In Nanyang oilfield, shallow heavy oil reservoir of large area is buried in depth from 200 m to 1000 m, and at atmospheric temperature, the heavy oil viscosity is 9050~52000 mPa·s. During the drilling process, lost circulation and hole collapse often occurs, the drilling fluid density was out of control, the cementing qualification rate was about 80%, and the high quality rate was less than 60%. Based on researches and tests, a set of technology and relevant cement slurry system were formed. In general, separable setting sand-cement slurry system with the density of 1.90 g/cm 3 was employed because it meets the special requirements of cementing at low temperature and later steam processing at high temperature in heavy oil wells; and at 30 ℃, the thickening time of the cement slurry for long section is conditioned within 90~120 min and the cement slurry for short section within 50~60 min, and the filtrate volume below 50 mL. This system has been used in 70 + wells with average depth of 400 m. Results showed that cement returned to the surface in all the wells. The cementing qualification rate was 96%, and the high quality rate was 82%.
出处
《钻井液与完井液》
CAS
北大核心
2005年第2期44-46,共3页
Drilling Fluid & Completion Fluid
