摘要
文23气田地层压力降至15 MPa,压力系数降至0.5,作业过程中大量液体漏失,气层污染严重,作业后返排困难,降低了气井措施效果。该文分析了低压低渗砂岩气层的伤害因素,围绕降低作业过程中的压井液漏失量,开展了泡沫压井液、凝胶暂堵、旋转抽砂泵、不压井作业等一系列工艺技术试验和应用,取得了一定效果,并针对应用中出现的新情况和新问题,从室内研究和现场应用2个方面,不断实验、改进和完善,降低了泡沫压井液的密度,延长了凝胶暂堵的作用时间,加快了旋转抽砂泵的捞砂速度,提升了不压井作业的安全性能,从而进一步拓宽了各项储层保护技术的应用范围和适应性,提高了低压气层保护效果,形成了低渗砂岩气田低压储层的配套保护技术系列,具有良好的推广应用前景。
The formation pressure of Wen 23 gas reservoir has reduced to 15 MPa and the pressure coefficient has inclined below 0.5. In addition, because a lot of liquids lost, the gas reservoir was seriously contaminated and the killing fluids were hard to flow back during the operation, the effect of workover was decreased. In this paper, the factors to damage the low pressure and permeability sand gas reservoir were analyzed. In order to pull down the leakage of killing fluid, the technologies such as foam killing fluid, temporary blocking gel, rotational sand pump and no killing operations were implemented, which had a good result in actual application. According to the new problems occurred in the application, we tried to improve and perfect the technologies by laboratory study and field application. In application, we successfully decreased the density of foam killing fluid, extended the action time of temporary blocking gel, accelerated the speed of sand-bailing with rotational sand pump and improved the safety performance of no killing operations. These measures widened the application range and adaptability of varies reservoir protection methods, and improved the protection effect of low pressure gas reservoir and developed a technical series of low-pressure protection supplementary technologies for low-permeability sandsatone gas reservoir, having a good application prospect.
出处
《断块油气田》
CAS
北大核心
2011年第1期97-99,共3页
Fault-Block Oil & Gas Field
关键词
低压
污染
保护
泡沫液
凝胶
不压井
low pressure
pollution
protection
foam liquid
gel
no killing operation
