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塔东北地区在钻井施工中,常出现与泥页岩有关的缩径、卡钻、电测失败及固井质量不高等问题。通过吸附膨胀及分散实验,对该地区5个构造上6口井的泥页岩样品进行了水敏性测试。该区不同构造上泥页岩的水化性能和特征相似,水敏性的纵向变化均大致呈上、下部地层差,中部地层强的趋势。泥页岩水敏性在地理位置上大致呈北低、南高和东西相近的分布趋势。中生界及部分古生界地层泥页岩的水敏性较强,最易出现井眼失稳问题。
In the northeastern part of the tower, drilling, drilling and shale-related shrinkage, stuck pipe, failure of electrical measurement and poor cementing quality often occur. Through the experiments of adsorption, swelling and dispersion, the water sensitivity of shale samples from 5 structures in 6 wells in this area was tested. The hydration characteristics and characteristics of mud shale in different tectonic settings in this area are similar. The longitudinal changes of water sensitivity are roughly the upper and lower strata are poor and the middle strata are strong. Shale water sensitivity in the geographical location is generally north low, south high and things similar to the distribution trend. Mesozoic and some Paleozoic formation shale water-sensitive, the most prone to borehole instability problems.