海上平台弃置含油污水现场处理回用技术
Technology for on-site treatment and reuse of oily sewage from offshore platform well abandonment
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- 引用格式:
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林家昱,张晓诚,谢涛,霍宏博,岳明,任安琪,郭小明.海上平台弃置含油污水现场处理回用技术[J].天然气与石油,2022,40(6):123-128.doi:10.3969/j.issn.1006-5539.2022.06.018
LIN Jiayu, ZHANG Xiaocheng, XIE Tao, HUO Hongbo, YUE Ming, REN Anqi, GUO Xiaoming.Technology for on-site treatment and reuse of oily sewage from offshore platform well abandonment[J].Natural Gas and Oil,2022,40(6):123-128.doi:10.3969/j.issn.1006-5539.2022.06.018
- DOI:
- 10.3969/j.issn.1006-5539.2022.06.018
- 作者:
- 林家昱 张晓诚 谢涛 霍宏博 岳明 任安琪 郭小明
LIN Jiayu, ZHANG Xiaocheng, XIE Tao, HUO Hongbo, YUE Ming, REN Anqi, GUO Xiaoming
- 作者单位:
- 中海石油(中国)有限公司天津分公司, 天津 300459
CNOOC China Ltd., Tianjin Branch, Tianjin, 300459, China
- 关键词:
- 弃井;含油污水;小型橇装化;高效分离;就地处理
Abandoned well; Oily sewage; Small skid-mounted; High-efficiency separation; On-site treatment
- 摘要:
- 随着渤海油田的不断开发,部分老油田超过设计周期,进入弃置阶段,同时油田低效井及长停井治理使得以井槽重复利用为目的的弃井作业不断增多,在油气井弃井刮管、洗井、磨料水射流切割等过程中,会产生大量污水,运回陆地处置费用高昂,因此含油污水处理成为亟需解决的难题。通过分析对比目前海上平台常用履带式负压振动筛、絮凝压滤一体机、油基钻屑热处理装置等废弃物处理装置,综合考虑海洋环保法律法规,研究了利用现有海上平台条件就地处置含油污水的措施,研制了小型橇装化含油污水高效分离装置。将前端储存在储油罐内的含油污水抽至高效分离设备,经调质、絮凝、气浮、过滤等技术措施处理后，污水含油量仅0.04 mg/L,可再利用于洗井液循环配制,油液部分污油含量达90%,装污油罐经拖轮运回陆地;利用小型橇装化含油污水高效分离装置的含油污水现场处理回用技术已应用于渤海油田,效果良好,平均单井可节省费用46万元,为导管架钻井及弃井等无生产流程海洋平台含油污水就地处理提供了新的技术手段。
With the continuous development of the Bohai oilfield, some old oilfields have exceeded the design life of the oilfield and entered the abandonment stage. At the same time, due to the management of low efficiency wells and long shutdown wells in the oil field, the number of well abandonment operations for the purpose of reusing well slots is increasing. In the process of scraping, cleaning, abrasive water jet cutting, etc. in oil and gas wells, a large amount of sewage will be generated, and the cost of transporting it back to onshore for disposal is high. Therefore, the treatment of oily sewage has become an urgent problem to be solved. By analyzing and comparing three kinds of waste treatment units such as crawler-type negative pressure vibrating screen and flocculation filter-press integrated machine and oil-based drilling cuttings thermal treatment device commonly used in offshore platforms, this study comprehensively considers marine environmental protection laws and regulations, assesses the measures to utilize the existing platform to dispose of oily waste liquid on-site, and develops a small skid-mounted high-efficiency separation device for oily sewage. The oily sewage stored in the upstream oil storage tank is pumped to high-efficiency separation equipment, and after conditioning, flocculation, air flotation, filtration and other technical treatment measures, the treated sewage oil content reaches 90%, and the treated sewage oil tank is transported by tugboat back to shore. The treated effluent has an oil content of only 0.04 mg/L, which can be used as the well washing recycling fluid. This study provides effective technical support for the disposal of oily sewage from well abandonment on offshore platforms. The high-efficiency separation device and sewage on-site treatment and reuse technology for oily sewage has been applied in Bohai oilfield with good results. On average, saving in treatment cost of a single well is up 460 000 yuan. This study provides a new way for the onsite treatment of sewage for offshore platforms without production processes, such as drilling jackets and abandoned wells.
