金川矿区复杂地层钻探冲洗液配方研究与应用

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

摘要:

针对金川矿区强水敏性、强破碎、强涌水及高地应力复杂地层钻探所遇缩径、掉块造成的卡钻和埋钻等孔内事故，对冲洗液提出了低失水量、强抑制性、强封堵性、合适的密度以及优良流变性能等要求。首先优选合适的冲洗液处理剂，包括降失水抑制剂FLI-1、封堵防塌剂FDC-1、抑制剂LHK和封堵剂FG-1；然后通过正交试验，研制了适用于金川矿区复杂地层的冲洗液配方，并针对冲洗液配方开展了常规性能、抑制性、封堵性和润滑性评价。现场应用试验结果表明，该冲洗液配方具有优良的流变性能，还兼具较好的抑制性、封堵性及润滑性，能够有效预防矿区钻探遇复杂地层引发钻孔事故，提高钻探效率，支撑矿区钻探施工。

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.