气体钻井岩屑分离系统设计

DESIGN OF CUTTINGS SEPARATION SYSTEM USED FOR GAS DRILLING

现行气体钻井返出岩屑只能依靠降尘水分离,排砂管线出口必须接到污水池,地层出气后不具备点火条件。若将排砂管线接到燃烧池进行点火,岩屑又容易堆积,影响燃烧池后续使用。迫切需要研究能有效实现分离、点火的除尘方法。文章从常规的环境处理方案中开启思路,以气体钻井返出岩屑分离的总流程分析为基础,将岩屑处理系统分为分离系统和循环水处理系统。分析并计算分离系统入口岩屑粒径和浓度,将分离系统设计为两级:一级分离采用湿式、重力、惯性原理除去大颗粒和部分细颗粒岩屑;二级分离采用湿式原理除去较细小颗粒。通过岩屑分离系统除尘性能计算结果可知,分离出的气体能达到直接排放标准并直接排放至燃烧池。此套系统对进一步拓宽气体钻井的应用领域,为气体钻井储层钻井技术的发展奠定坚实基础。

Current cuttings separation in gas drilling only relied on dust- water separator,its sand discharge pipe outlet was connected to sewage tank,the ignition was impermissible after gas production. If the exhaust pipe was connected to the combustion pool ignition,the cuttings were easy to accumulate.Based on above causes,a new cuttings separation system was studied which could effectively separate cuttings and realize ignition. Based on the analysis of cuttings separation process in gas drilling,the cuttings separation system of gas drilling was divided into separation system and circulating water treatment system.The principle of the cuttings separation system of gas drilling was analyzed and the entry grain diameter and concentration of cuttings were calculated. Through calculating the dust removal effect of the system,results showed that the separated gas could achieve direct discharge standard and blow off directly into the combustion pools. This system further broadened the application field of gas drilling.