机采水平井低表面能防蜡技术研究与应用
|
摘要
长庆油田部分水平井开发区块随着生产时间的不断延续,生产过程中井筒出现了严重的结蜡现象。为保证油井正常生产,针对水平井的结蜡特点和影响结蜡的因素提出了一种水平采油井低表面能油管防蜡技术,通过在油管内表面涂覆具有疏油疏水、光滑内涂层,形成低表面能的油管内壁,阻止蜡晶吸附,起到防蜡目的。文章基于水平井产出液对油管涂层防蜡性能的影响,开展不同蜡质、含水、温度、压力等条件下油管涂层的优选及适应性评价研究,制定不同工况下油管防蜡涂层选用图版,同时针对机采井开展了防蜡涂层的耐磨性评价,指导现场应用。现场试验45口井,试验后在没有采取其它清防蜡措施情况下,到目前平均生产周期已达75 d,最长井达395d,尚未出现检泵作业。研究结果表明,机采水平井低表面能防蜡技术与传统清防蜡工艺相比,不需要周期性地进行清防蜡作业,可以有效降低管理风险,经济效益更好。
With the continuous production in horizontal wells at Changqing oilfield,serious waxing is observed in the wellbore during the production. In order to ensure the normal production of oil wells,according to the wax characteristics of the horizontal wells and the influencing factors,a thin hydrophobic,oil-phobic coating is added on the inside wall of the tubing to form a smooth low surface-energy internal tubing wall to prevent wax crystal adsorption. Based on the effects of horizontal well produced fluids on the performance of pipe coating,by conducting studies on different wax,water cut,temperature and pressure conditions to find the optimum coatings and evaluate the adaptability. A tubing paraffin coating selection chart is made for different working conditions. a wear evaluation is also made for the coatings to guide the field use. At present,it has been tested in 45 wells,the average production cycle has reached 75 days,and the longest one is 395 days. No pump repair has been needed. The research results show that the low surface energy dewaxing technology compared with traditional process does not need periodical dewax operations,can effectively reduce the management risk,and get better economic benefits.
With the continuous production in horizontal wells at Changqing oilfield,serious waxing is observed in the wellbore during the production. In order to ensure the normal production of oil wells,according to the wax characteristics of the horizontal wells and the influencing factors,a thin hydrophobic,oil-phobic coating is added on the inside wall of the tubing to form a smooth low surface-energy internal tubing wall to prevent wax crystal adsorption. Based on the effects of horizontal well produced fluids on the performance of pipe coating,by conducting studies on different wax,water cut,temperature and pressure conditions to find the optimum coatings and evaluate the adaptability. A tubing paraffin coating selection chart is made for different working conditions. a wear evaluation is also made for the coatings to guide the field use. At present,it has been tested in 45 wells,the average production cycle has reached 75 days,and the longest one is 395 days. No pump repair has been needed. The research results show that the low surface energy dewaxing technology compared with traditional process does not need periodical dewax operations,can effectively reduce the management risk,and get better economic benefits.
引文
[1]中国油气总公司.低渗透油田开发技术[M].北京:石油工业出版社,1996.
[2]叶勤友,林海霞,张超会,等.水平井压裂技术在低渗透油田开发中的研究与应用[J].钻采工艺,2008,31(增):57-59,76.
[3]刘爱华,章结斌,陈创前.油田清防蜡技术发展现状[J].石油化工腐蚀与防护,2009,26(1):1-3.
[4]敬加强,杨莉,秦文婷,等.含蜡原油结构形成机理研究[J].西南石油学院学报,2003,25(6):49-52.
[5]张立新.原油性质对油井结蜡程度的影响[J].油气田地面工程,2010. 29(8):12-13.
[6]王尊策,侯灵霞,刘志刚,等.井下液力自动清蜡装置设计及试验研究[J].机械设计,2013,30(12):58-61.
[7]都芳兰,等.固体防蜡块清防蜡技术应用[J].石油化工腐蚀与防护,2011,28(2):44-46.
[8]刘永明,施建宇,鹿芹芹,等.基于杨氏方程的固体表面能计算研究进展[J].材料导报,2013,27(6):123-128.
[2]叶勤友,林海霞,张超会,等.水平井压裂技术在低渗透油田开发中的研究与应用[J].钻采工艺,2008,31(增):57-59,76.
[3]刘爱华,章结斌,陈创前.油田清防蜡技术发展现状[J].石油化工腐蚀与防护,2009,26(1):1-3.
[4]敬加强,杨莉,秦文婷,等.含蜡原油结构形成机理研究[J].西南石油学院学报,2003,25(6):49-52.
[5]张立新.原油性质对油井结蜡程度的影响[J].油气田地面工程,2010. 29(8):12-13.
[6]王尊策,侯灵霞,刘志刚,等.井下液力自动清蜡装置设计及试验研究[J].机械设计,2013,30(12):58-61.
[7]都芳兰,等.固体防蜡块清防蜡技术应用[J].石油化工腐蚀与防护,2011,28(2):44-46.
[8]刘永明,施建宇,鹿芹芹,等.基于杨氏方程的固体表面能计算研究进展[J].材料导报,2013,27(6):123-128.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |