Optimization and Application of Efficient Drilling Technologies for Large-Scale Well Cluster Fields in Dagang Oilfield
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摘要: 为了解决大港油田大型井丛场开发过程中井间防碰风险大、轨道优化难和钻井提速难等问题，根据地质工程一体化研究思路，进行了井网部署、井眼轨道及防碰设计、井身结构及配套提速工具等关键技术研究，建立了井口–靶点匹配关系、剖面类型设计优先级层序、 造斜点“V”形设计法则、井身结构与一趟钻提速工艺模板，形成了大港油田大型井丛场高效钻井技术。该技术在大港油田进行了现场应用，其中港西二号大型井丛场作为大港油田陆上最大规模井丛场，实现了56口井的安全规模开发，节约井场征地、钻井搬迁等费用1 200万元，平均单井钻井周期4.42 d，机械钻速48.64 m/h。研究与现场应用表明，大型井丛场高效钻井技术在提升井场利用率、缩短钻井周期、提高机械钻速及降低成本方面效果显著，为大港油田效益开发提供了技术支撑。Abstract: The development of large-scale well cluster fields in Dagang Oilfield encounters problems such as the high risk of collision between wells, difficulties in trajectory optimization and drilling acceleration, etc. According to the idea of integrating geology and engineering, the key technologies involved were studied, including well pattern deployment, wellbore trajectory and anti-collision design, casing program, and supporting drilling acceleration tools. This paper established the wellhead-target matching relationship, the priority sequence of profile type design, the V-shaped design rule for kick-off points, the casing program, and the acceleration process template of one-trip drilling. In this way, efficient drilling technologies were developed for the large-scale well cluster fields in Dagang Oilfield, and were applied to the Dagang Oilfield. The large-scale well cluster field Gangxi No.2 is the largest among the onshore well cluster fields in Dagang Oilfield. In this well cluster field, safe and scaled development of 56 wells were achieved, with a cost saving of CNY 12 million in aspects such as land expropriations for well sites and drilling relocation, and an average single-well drilling cycle of 4.42 d, and rate of penetration (ROP) of 48.64 m/h. The research and applications showed that the developed technologies displayed outstanding performance in raising the utilization rate of well sites, shortening the drilling cycle, increasing ROP, and lowering the costs. The results can provide technical support for the profitable development of Dagang Oilfield.
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图 4 J23-52井防碰分离系数随造斜点变化情况
Figure 4. Variation of anti-collision coefficients with kick-off points of Wwll J23-52
表 1 港西一号平台原部署方案某井设计剖面
Table 1 Design profile for a well of the originally deployed plan on the Gangxi No. 1 Platform
关键点 井深/
m井斜角/
（°）方位角/
（°）垂深/
m全角变化率 /
（（°）·（30m）–1）井斜角变化率/
（（°）·（30m）–1）方位角变化率/
（（°）·（30m）–1）视平移/
m造斜点 100.00 0 0 100.00 0 0 0 0 造斜终点 251.12 12.09 0 250.00 2.400 2.400 0 –11.19 增斜点 870.65 62.78 140.07 764.71 3.500 2.455 6.783 253.46 增斜终点 1 122.73 62.78 140.07 880.00 0 0 0 476.68 井底点 1 302.02 62.78 140.07 962.00 0 0 0 635.44 
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表 2 羊三木一号平台某井不同剖面参数对比
Table 2 Parameters comparison of different profiles for a well on the Yangsanmu No. 1 Platform
剖面类型 造斜点/m 造斜率/（（°）·（30m）–1） 井斜角/（°） 单增剖面 785.25 2.67 90.00 双增剖面 270.00 3.60 20.08 1 199.52 3.00 90.00
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表 3 某页岩油井场井眼轨道参数设计结果
Table 3 Design results of wellbore trajectory parameters for a shale oil well field
井号 造斜点/m 井斜角/（°） 靶前位移/m 井底位移/m 井深/m 第一 第二 第三 第一 第二 第三 第四 1-1H 650.00 3 280.00 2 482.00 6.00 0 23.41 84.35 84.35 781.52 4 300.00 1-2H 400.00 3 225.75 3 385.56 7.00 0 10.41 86.45 393.88 794.00 4 300.00 1-3H 500.00 3 000.00 3 507.79 8.00 0 27.01 85.47 521.38 858.29 4 293.00 1-4H 600.00 3 100.00 3 633.63 8.50 0 86.93 90.13 560.00 2 126.53 5 526.00 1-5H 900.00 3 000.00 3 654.02 5.00 9.52 85.79 87.87 432.66 1 442.62 4 990.00 1-6H 800.00 2 900.00 3 489.64 6.00 0 18.39 84.69 470.99 1 418.81 4 934.00
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