Geosteering Drilling Techniques of Horizontal Sidetracking Well JA, Southeast Sichuan
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摘要: 川东南焦石坝及其外围页岩地层地质导向钻井存在井震矛盾突出、岩屑代表性差、地质设计与实钻地层之间往往存在较大偏差等技术难点。针对上述技术难点,基于地震及邻井资料,建立了钻前地质导向模型,以预测可能钻遇的地层;在入靶前的地质导向阶段,根据随钻测井资料和录井资料,进行地层精细对比,并修正地质导向模型,调整靶点深度,确保水平井安全、高效着陆;在水平段地质导向阶段,充分利用随钻测井、气测、钻时、岩性等数据,准确判断钻头位置,并实时修正地质导向模型,以确保钻头始终处于目的层,形成了适用于该地区的页岩水平井地质导向钻井技术。该技术在焦石坝外围的JA侧钻水平井进行了应用,气层钻遇率达到100%,优质气层钻遇率85.5%,取得了良好的应用效果。现场应用表明,该页岩水平井地质导向钻井技术适用于川东南地区页岩水平井钻井,能够有效提高气层钻遇率,对国内类似页岩气区块地质导向钻井也有借鉴作用。Abstract: Geosteering drilling through shale formations at Jiaoshiba and outside in Southeast Sichuan are characterized by technical difficulties such as the obvious contradiction and poor correlation between logging and seismic data, poor representativeness of cuttings, and larger deviation between geological designs and drilled formations. To solve these technical difficulties, pre-drilling geosteering models were first established based on seismic data and offset well data to predict the formations to be drilled. At the geosteering stage prior to entering the target, MWD and mud logging data were used for in-depth comparison of the formations, and subsequent modification the geosteering model and adjustment of the target depth to ensure safe and efficient landing of the horizontal well. At the geosteering stage for the horizontal section, MWD, gas logging, drilling time, lithology and other data were employed to accurately determine the position of the bit and correct the geosteering model in real-time to keep the bit in the target zone all the time, which is applicable to the geosteering drilling technology of horizontal shale wells in the area. The technology was applied to the horizontal sidetracking Well JA outside Jiaoshiba. The rate of drilling through gas formations for Well JA was 100% and the high quality rate of gas formation drilling was 85.5%, which showed a good application effect. The application results showed that the geosteering drilling technology is suitable for horizontal shale drilling in Southeast Sichuan. It could effectively improve the rate of gas formation drilling and could be also taken as a reference for geosteering drilling in other similar shale gas blocks in China.
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Keywords:
- geosteering drilling /
- shale /
- horizontal wells /
- geological model /
- formation comparison /
- Southeast Sichuan Area
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