在煤田钻探中，常常遇到以粉砂岩、砂质泥岩以及泥岩为主的大段煤系地层。这类地层水敏性较强，遇水膨胀，剥蚀，往往在钻进过程中，地层自然造浆，冲洗液粘度升高很快，比重增大，岩粉沉淀不好，固相含量难以控制，泥浆流变性能差，从而严重影响了钻进效率的进一步提高。针对上述情况，我们对如何控制大段煤系地层的自然造浆，降低泥浆中的 In the coalfield drilling, often encountered siltstone, sandy mudstone and mudstone based large coal measure strata. This kind of strata has strong water sensitivity, water swelling and denudation. During the drilling process, the strata naturally produce pulp, the viscosity of the rinsing fluid increases rapidly, the specific gravity increases, the precipitation of rock dust is not good and the solid content is difficult to control , Mud rheology is poor, thus seriously affecting the further improvement of drilling efficiency. In response to the above situation, we are on how to control the large section of the natural coal slurry formation, reducing the mud