氮气泡沫在海上高含水油田选择性堵水中的应用

Application of nitrogen foam in selective water plugging of offshore high water content oil field

孙鹏霄 苏崇华 孟伟斌

SUN Pengxiao SU Chonghua MENG Weibin

中国海洋石油国际有限公司

CNOOC Limited, Beijing 100016, China

国外海上合作油田在合同期内都以最快的采油速度生产，以追求效益最大化为目的，破坏性开采在所难免，印尼W 油田就是如此。该油田为砂岩边底水层状油藏，边底水能量充足，依靠天然能量开发，投产2 年后综合含水率高达70%。全油田共有采油井190 口，因水淹关井33 口，生产井的含水在97%~99% 之间，平台空间小，限制了一些成熟控水技术的应用。针对这些问题，经过多套技术优化研究，探索了一套适合特高含水开发油藏的氮气泡沫选择性控水技术。现场实施32 口井，成功率78.1%，累计增油116 513 m3，其中具有正韵律特征的油藏井作业成功率高达88%。

Since foreign cooperative offshore oilfields pursue the quickest oil production rate for the purpose of profitability maximization, irrational extraction can hardly be avoided, and the W oilfield in Indonesia was extracted so. W oilfield is a sandstone edge-bottom aqueous lamellar oil reservoir with sufficient edge-bottom water. It was developed by virtue of natural energy. Its average water cut reached 70% after putting into operation for 2 years. There were totally 190 production wells, 33 of which were closed for water logging. Water cut of production wells was between 97%~99%, and some mature water control techniques were not used due to small platform space. To solve these problems, a set of selective water control techniques with nitrogen foam suitable for ultra-high water cut reservoirs after multiple technique optimization researches. This technique was implemented for 32 wells onsite and achieved a success rate of 78.1%. Besides, the operation success rate of application in reservoir wells with characteristics of positive rhythm was 88%, and oil of 116 513 m3 was increased accumulatively.

10.13639/j.odpt.2016.01.022