一种含有动力学抑制剂的深水水基钻井液的研制

Development of Water-based Deepwater Drilling Fluid Containing Kinetic Inhibitor

刘卫红 俞 玲 许明标 王 鼎

LIU Weihong YU Ling XU Mingbiao WANG Ding

气体水合物的生成是深水条件下钻井作业公认的危害，同时深水低温也会导致钻井液的流变性能发生变化。为提高深水条件下钻井液对气体水合物的抑制性能以及钻井液在低温下的流变稳定性能，通过室内研究，建立了一套含有动力学抑制剂的深水水基钻井液体系（配方为：3%搬土+处理海水+6%流型调节剂UFLOW+0.05%增黏剂VIS-HX+20%NaCl+7%聚合醇GLYCOL+3%降滤失剂Flocat+0.5%动力学抑制剂PVP）。研究了该体系的水合物相平衡、流变性、滤失性、抗温性、抗侵污性、抑制性等。研究结果表明，该体系在水深2000 m、水温3℃左右的环境下，可有效地抑制气体水合物的生成；在低温条件下钻井液体系能保持良好的流变性能，钻井液的PV、YP在作业范围的温度段内变化较小，具有恒流变的特性；钻井液体系具有较好的抗温能，在60~130℃的温度范围内热滚老化后，其流变参数和滤失性基本保持稳定，同时钻井液体系具有较好的抗污染能力以及良好的抑制性能，能够满足深水钻井的要求。图3表3参10

Gas hydrate formation during deepwater drilling is a well-recognized operational hazard，and the rheological properties of drilling fluid will be changed at deepwater low temperature environment. In order to solve the problems of formation of gas hydrate and improve the rheological properties of the deepwater drilling fluid at low temperature，a water-based deepwater drilling fluid containing kinetic inhibitor was established in laboratory，composed of 3% bentonite，treated seawater，6% flow pattern modifier UFLOW， 0.05% viscosifier VIS-HX， 20% NaCl，7% polyol GLYCOL， 3% filtrate reducer Flocat and 0.5%thermodynamic inhibitor PVP. The hydrate phase equilibrium，rheology，filtration，temperature resistance，anti-contamination and inhibition of the drilling fluid was measured. The results showed that the drilling fluid could suppress the formation of gas hydrate effectively at the water depth of 2000 m and at the temperature of 3℃. Meanwhile，the drilling fluid could keep good rheological properties at low temperature and the PV，YP of the drilling fluid had little changes among the operating temperature ranges，which exhibited constant rheological properties. The drilling fluid could keep stable rheological and filtration properties after hot rolling at the temperature of 60—130℃ and possessed good anti-contamination and shale inhibitive properties，which indicated that the drilling fluid could satisfy the requirements of deepwater drilling.

10.19346/j.cnki.1000-4092.2019.04.002