渤海油田定向井井身结构优化及应用

Optimization of the casing program of directional well and its application in the Bohai Oilfield

刘小刚 赵少伟 马英文 刘宝生 何瑞兵

LIU Xiaogang ZHAO Shaowei MA Yingwen LIU Baosheng HE Ruibing

中海石油(中国)有限公司天津分公司 海洋石油高效开发国家重点实验室油田钻完井室

CNOOC China Limited Tianjin Branch, Tianjin 300452, China Oilfield Well Drilling and Completion Department, State Key Laboratory of Offshore Oil Exploitation, Tianjin 300452, China

井身结构优化是钻完井降本提效的主要措施之一。论证了目前渤海油田常规定向井所采用的Ø444.50 mm井眼(Ø339.73 mm表层套管)+Ø311.15 mm井眼(Ø244.47 mm生产套管)、Ø444.50 mm井眼(Ø339.73 mm表层套管)+Ø250.82 mm井眼(Ø177.80 mm生产套管)两种井身结构组合的优缺点，提出了Ø311.15 mm井眼(Ø273.05 mm表层套管)+Ø241.30 mm井眼(Ø193.67 mm生产套管)的井身结构，并论证了该组合的钻完井可行性。现场应用表明，与邻井相比，采用优化后的井身结构机械钻速可提高35.8%，单井可节约钻井成本约200万元，降本增效成果显著，具有非常广阔的应用前景。

The optimization of casing program is one of the important measures for the cost reduction and efficiency increase of well drilling and completion. The advantages and disadvantages of two casing programs which are currently used in the conventional directional wells of Bohai Oilfield were demonstrated, i.e., Ø444.50 mm hole (Ø339.73 mm surface casing)+Ø311.15 mm hole (Ø244.47 mm production casing), and Ø444.50 mm hole (Ø339.73 mm surface casing)+Ø250.82 mm hole (Ø177.80 mm production casing). Then, the casing program of Ø311.15 mm hole (Ø273.05 mm surface casing)+Ø241.30 mm hole (Ø193.67 mm production casing) was put forward and its feasibility of drilling and completion was demonstrated. Field application indicates that compared with the neighboring wells, the rate of penetration (ROP) of the well with optimized casing program is increased by 35.8% and the single-well drilling cost is reduced by RMB 2×10 yuan, presenting remarkable achievement of cost reduction and efficiency increase. Therefore, its application prospect is promising.

10.13639/j.odpt.2019.04.009