Research and application on the flushing fluid formula for drilling in the complex strata of Jinchuan mining area

Abstract:

In response to the hole-inside accidents such as drill jamming and burying caused by hole shrinkage and chipping encountered during drilling in the complex strata of Jinchuan mining area， which are characterized by strong water sensitivity， intense fragmentation， severe water inrush， and high ground stress， requirements for the flushing fluid have been set， including low water loss， strong inhibition， strong sealing， appropriate density， and excellent rheological properties. Firstly， suitable flushing fluid treatment agents were selected， including the water loss reducing inhibitor FLI-1， the sealing and anti-collapse agent FDC-1， the inhibitor LHK， and the sealing agent FG-1. Then， through orthogonal experiments， a flushing fluid formula suitable for the complex strata of Jinchuan mining area was developed， and the conventional performance， inhibition， sealing， and lubricity of the formulated flushing fluid were evaluated. The results of field application tests showed that this flushing fluid formula possesses excellent rheological properties， along with good inhibition， sealing， and lubricity. It can effectively prevent drilling accidents caused by complex strata encountered in the mining area drilling， improve drilling efficiency， and support drilling construction in the mining area.