摘要
MHR封隔器是一种液压坐封永久式封隔器,广泛应用于高温高压气井分段压裂、试气和完井。针对MHR封隔器在常规打捞时存在封隔器易成散件、磨套铣产生大量碎屑堵塞井筒、打捞时效低等问题,开展了水平气井MHR封隔器磨套铣打捞工艺的优化。通过对MHR封隔器结构及工作原理的认识,预先在封隔器坐落短节处投入堵塞器,采用先磨铣封隔器棘齿密封筒,再套铣封隔器上卡瓦的打捞工艺,优选了高黏度氯化钙无固相修井液满足携屑需要,并对打捞过程中可能出现的碎屑返出不彻底的情况,制订了强磁和负压捞筒打捞措施。现场应用表明,使用高效引子磨鞋、特殊铣鞋、可退式加长型卡瓦打捞矛等工具的MHR封隔器磨套铣打捞工艺较常规打捞工艺可提高打捞时效30%。该工艺的成功应用,提高了打捞针对性,保证了井筒清洁。
MHR packer is a kind of permanent packer,set by hydraulic pressure,which has been widely used in horizontal gas wells under high temperature and high pressure environment for separate layer fracturing,gas test and completion.In conventional fishing,some problems happen such as packers being easily to split into parts;large number of debris blocking the wellbore while milling and washover;and low fishing efficiency,etc.Due to the problems when fishing MHR packers,the optimization of fishing technology with milling and washover for MHR packer in the horizontal gas well has been carried out.Through the understanding of the structure and working principle of MHR packer,a blanking plug was dropped into the landing nipple in advance,and the fishing technology of milling the ratchet seal gland firstly,and then washover the upper slips of the packer was used.In addition,the high viscosity solid free workover fluid with calcium chloride has been optimized to meet the need of carrying cuttings,and the fishing measures of strong magnetic and negative pressure were taken to remove the fallen debris when the debris cannot totally flushed out of the wellbore.Field application showed that the fishing technology for MHR packer in horizontal gas well could improve the fishing efficiency 30%higher than that of conventional fishing method by using high efficient lead milling shoe,special milling shoe,retrievable lengthening slip spear and other tools.Its successful application has improved the fishing pertinence,and kept the wellbore cleaned.
出处
《采油工程》
2017年第4期7-9,75-76,共4页
Oil Production Engineering
