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首页> 外文期刊>Petroleum exploration and development >Practice and understanding of sidetracking horizontal drilling in old wells in Sulige Gas Field, NW China
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Practice and understanding of sidetracking horizontal drilling in old wells in Sulige Gas Field, NW China

机译：中国苏尔格气田旧井散水平钻井的实践与理解

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To seek effective ways of lowering development cost and tapping inter-well remaining reserves, sidetracking horizontal wells from old wells in Su10 and Su53 Block were conducted. The engineering and geological problems such as leakage, collapse and sticking in slim-hole sidetracking, and difficult evaluation of remaining gas were gradually overcome, and a set of drilling and completion technology, well deployment optimization technology and geo-steering technology suitable for sidetracking horizontal wells in tight sandstone gas reservoirs have been worked out. By making full use of the old well, sidetracking horizontal wells can greatly reduce development costs, enhance the producing degree of inter-well remaining reserves, and get production 3-5 times of that of adjacent vertical wells. Its production effect is influenced by encountered sandstone length, the position of the horizontal segment in the reservoir, produced effective reservoir thickness, gas saturation, controlled reserves and fracturing effect, etc. Up to now, in Block Su10 and Su53, 12 sidetracking horizontal wells have been drilled, which have an average drilling cycle of 49 days, average horizontal section length of 689 m, average effective drilling ratio of 61.5%, average well-head pressure of 16.2 MPa, and daily output of 4.7×104m3at the initial stage after production. By the end of 2017, the average yield increment was more than 1 000×104m3with good effect. With the increase of low yield old wells, wells in the enrichment regions tend to be saturated and the rest gas-bearing areas are lower in grade, therefore, sidetracking horizontal well can be used for optimization of well pattern, well deployment mode and exploitation of remaining oil areas.
机译：为了寻求降低开发成本和挖掘井间剩余储备的有效方法，进行了来自SU10和SU53块的旧井的水平孔。泄漏，坍塌和粘附的工程和地质问题，逐渐克服漏洞，难以评估剩余气体，以及一套钻井和完井技术，井部署优化技术和地理转向技术，适用于水平的侧链紧密砂岩煤气藏的井已经制定了。通过充分利用旧井，横向水平井可以大大降低开发成本，增强井间剩余储备的生产程度，并获得相邻垂直井的3-5倍的生产。其生产效果受到遇到的砂岩长度，储层中水平段的位置，产生有效的储层厚度，气体饱和度，受控储备和压裂效果等，其斜坡SU10和SU53,12侧面水平孔已经钻了，具有49天的平均钻孔周期，平均水平截面长度为689米，平均有效钻孔比率为61.5％，平均井头压力为16.2MPa，每日输出为4.7×104m3的初始阶段生产。到2017年底，平均产量增量超过1 000×104m 3，效果良好。随着低产量旧井的增加，富集区域中的孔趋于饱和，并且其级别的含水轴承区域较低，因此，侧面井井可用于优化井图案，井部署模式和开发剩余的石油区域。

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