治理安全隐患 综合利用低效小气井天然气

RECOVERY OF LOW-PRODUCTION SMALL GAS WELLS BY PREVENTING POTENTIAL RISKS

Q/SH0003.1-2004《天然气井工程安全技术规范》标准规定:无工业开采价值的废弃井,必须采取封堵措施。废弃井中的低效小气井天然气产量低、井口压力高,既无经济开采价值,又是一个安全隐患;同时由于这些低效小气井采用带压固井封堵,投资较高,因而既造成了经济损失,又浪费了宝贵的资源。为此,根据低效井天然气气质组分,针对性地选择脱硫—脱水—深度脱水—增压—运输—用户的工艺方案,合理开发利用小气井天然气后再封井。这样做一是可以将已征用的井场土地还耕还林;二是变长期闲置的低效小气井天然气为有用资源;三是治理了安全隐患,保障了小气井附近居民的安全;四是摸清了这些含气构造储层情况,为进一步勘探开发打下基础。

According to Safety Technical Codes for Engineering Works in Natural Gas Wells, Q/SH0003.1-2004 in oil industry, those abandoned wells without any value on industrial production must be killed and plugged in order to avoid any possible damage or dangers. Though it is a fact that those abandoned wells have been threatened the vicinity security at well sites, adopting pressurized cementing means in order to kill and plug those wells will not only increase the cost input but completely lose any possibility to get much more potential source. Therefore, according to different compositions of natural gas from an individual well, this study selected the technology accordingly by the chart of desulfurization → dehydration → further dehydration → boost pressure → transmission → customers. If killing wells followed after much more gas being fully explored, this paper concluded that benefits would be obtained from this way as follows: (1) the occupied well sites would be revived to lands for crops and trees; (2) more and more deserted gas would be recovered; (3) residents nearby the well sites would be protected from any possible dangers; (4) gas-bearing formations would be further studied for future exploration and development around this area.