樊试U1井组远端连通关键技术

Key techniques for far connection of fan U1 test well group U-shaped well-Fanshi U1 well group

樊试U1井组是渤海钻探在山西沁水地区承接的第1口U型水平连通井,其设计水平位移近千米,远远超过该地区之前施工的连通井。煤层气开发实践证明U型井可有效地导通煤储层的裂隙系统,增加气、水导流能力,相比直井和普通定向井大幅度提高了单井产量和采收率,而相比较于多分支水平井又大幅减少了投入成本,是开发煤层气资源的优选手段。介绍了U型井设计施工方案及?50.8 mm PVC筛管完井工艺。通过分析该地区15号煤储层地质特点,介绍了通过"二维"地震图计算着陆点处15号煤层垂深的方法。通过建立仪器系统误差累积数学模型,提出磁偏角校正系数,成功完成了远端一次性连通。

The Fan U1 test well group was the ifrst U-shaped horizontally connected well drilled by Bohai Drilling Engineering Company Limited in Qinshui, Shanxi Province. Its designed horizontal displacement is nearly 1 000 m, much longer than the connected wells drilled previously. Coalbed methane development practices show that the U-shaped connected well can effectively connect the ifssure system in the coal reservoir, increase the gas and water conductivity. Compared with vertical wells and ordinary directional wells, the U-shaped wells have greatly increased the single-well production and recovery rate, compared with multi-branch horizontal wells, the investment is greatly reduced. So this U-shaped well is a top option in the development of coalbed methane. This paper introduces the design and drilling philosophy of U-shaped well and the completion technology with ?50.8 mm PVC screen pipe. By analyzing the geological characteristics of #15 Coal Reservoir, this paper presents a method to calculate the vertical depth of landing point in #15 Coal Reservoir through 2D seismic graph. By building a mathematical model for error accumulation of instrument system, the magnetic declination correction coefifcient is presented in this paper, and far-end connection was realized successfully at one time.