Double-fiber fine blocking agent along with drilling, and preparation method thereof

The present invention provides a double-fiber fine blocking agent along with drilling, wherein the components comprise, by mass, 100 parts of mica, 30-80 parts of wood fiber, and 20-60 parts of brucite fiber. According to the present invention, the double-fiber fine blocking agent along with drilling provides good rapid leakage blocking effects for osmotic leakage loss or micro-fracture leakage loss, especially for the leakage loss in the Luohe Formation stratum and the Liujiagou formation stratum, can prevent the leakage loss of the drilling fluid in the low pressure bearing stratum, has characteristics of easily available raw material, simple preparation process and low use cost, and does not affect the rheology of the drilling fluid. 本发明提供了种双纤维随钻细堵剂，包括以下组分：按质量份计，100份云母、30-80份木质纤维、20-60份水镁石纤维，该双纤维随钻细堵剂，对于渗透性漏失或微裂缝性漏失，特别针对洛河组和刘家沟组地层的漏失，具有很好的快速堵漏的效果，对于低承压地层，可防止钻井液的漏失，而且原料易得，制备工艺简单，使用成本低廉，还不影响钻井液的流变性。