渤海稠油油田高含水期低产低效井综合治理技术

S油田是渤海典型的水驱开发稠油油田，目前油田已经进入高采出程度、高含水率的“双高”阶段，随着油田含水上升，油田低产低效井逐年增多，严重影响油田开发效果。针对S油田地质特征和开发特征，对低产低效井成因进行分析，从剩余油、砂体发育、储层非均质性、注采关系、钻完井污染及井筒完整性等方面开展研究，并对低产低效井进行分类，针对不同类型低产低效井开展治理对策研究，制定了“平面分区、纵向分层、分类研究、治理与挖潜调整同步”的治理策略，最大限度发挥油田潜力和提高经济效益。近3年通过对S油田低产低效井治理技术的研究和应用，形成了高含水砂体挖潜、薄层挖潜、高含水期水平井产能评价、注采井网调控、潜力储量评价等技术，成功指导了渤海S油田51口低产低效井的治理研究，新增探明储量300×104 m3。2017—2019年已治理33口低产低效井，2019年7月实现日增油近1200 m3，预测到开发期末累增油近240×104 m3，提高采收率近1%，低产低效井治理效果显著。该低产低效井综合治理技术的研究和应用，对海上稠油油田高含水期低产低效井治理具有一定的指导和借鉴意义。

Comprehensive treatment technologies for the stripped and deficient wells of Bohai heavy oil field in high water cut stage

S Oilfield is a typical waterflooding heavy oil field in Bohai Sea, and by now, it has stepped into the two-high stage (high degree of reserve recovery and high water cut). With the rise of water cut, the number of stripped and deficient wells increases year after year, which seriously impacts the development effect of S Oilfield. Based on the geological and development characteristics of S Oilfield, this paper analyzed the causes of stripped and deficient wells from the aspects of remaining oil, sandbody development, reservoir heterogeneity, injection-production relationship, drilling & completion contamination and wellbore integrity. In addition, the stripped and deficient wells were classified. And based on the classification, the corresponding treatment countermeasures were studied, and the treatment strategies of “areal zoning, vertical layering, classification based research, and simultaneous treatment and potential tapping adjustment” were developed, so as to give full play to the oilfield potential and improve the economic benefit to the utmost. Based on the research and application of stripped and deficient well treatment technologies in S Oilfield in the last three years, a series of technologies have been developed, including high water cut sandbody potential tapping, thin bed potential tapping, high-water-cut horizontal well productivity evaluation, injection/production well pattern adjustment and control, and potential reserve evaluation, which have successfully guided the treatment of 51 stripped and deficient wells in S Oilfield, achieving new proved reserves of 300×104 m3. 33 stripped and deficient wells were treated during 2017-2019, and the daily oil increment was 1 200 m3 in July 2019. It is predicted that the cumulative oil increment by the end of development stage will be nearly 240×104 m3 and the recovery factor will be increased by about 1%, indicating remarkable treatment results of stripped and deficient wells. The research and application of these comprehensive stripped and deficient treatment technologies is of certain guidance and reference significance to the treatment of stripped and deficient wells of offshore heavy oil fields in high water cut stage.