任丘古潜山油藏开发后期优化井身结构的尝试

进入开发后期的任丘古潜山油藏,地下情况发生了根本性变化。文中论述了将原?444.5mm×?241.3mm的钻头程序和?339.7mm×?177.8mm的套管程序,改变为?444.5mm×?216mm的钻头程序和?339.7mm×?139.7mm的套管程序的设想。1997年实施了6口井,3口直井与原方案比较,平均机械钻述提高3.18m/h,平均钻井周期缩短10d,平均建井周期缩短12.5d。在可钻性较差的潜山井段,采用了美国休斯公司和瑞德公司的小直径三牙轮钻头,与研磨型钻头相比,平均每口井少用钻头4.6只,平均机械钻速提高1.16m/h(6.1倍),钻井周期减少12.07d,钻头成本减少2816元/m,平均潜山段成本减少12950元/m。在实施的6口井中,节约套管252.1t,价值209.24万元,在钻井液和环保方面也取得了不同程度的经济效益和社会效益。

AN ATTEMPT TO OPTIMIZE CASING PROGRAM DURING THE LATER DEVELOPMENT PERIOD IN BURIED HILL RESERVOIR OF RENQIU

The thorough changes took place in buried hill reservoir of Renqiu during the later development period. This paper discussed the assumption to change the previous bit program of ?444. 5× 241. 3mm and casing program of ?339. 7×177. 8mm into the bit pro gram of ?444. 5× 216mm and the casing program of ?339. 7×139. 7mm. It was performed in 6 wells in 1997. Compared to previous project in vertical sections of 3 wells, the average penetration rate increased 3. 18m/h, the average drilling cycle reduced 10d, the average wellconstruction period reduced 12. 5d. In the buried hill well section with bad drillability, small diameter three roller bit made by Hudges and Reed co. of America was used, compared to abrasive bits, 4. 6 pieces bit were saved in each well, the drilling cycle reduced 12. 07d, the penetration rate increased 6m/h(6. 1 times), the bit cost reduced 2816yuan/m and the periodic cost reduced 12950yuan/m. In 6 executive wells, 252. 1t casing were saved with a value of 2092- 4 thousand yuan. Economic and social benefits were also obtained in terms of drilling fluid and environmental protection.