Construction and Performance Research of High Density Solid Free and Low Damage Well Killing Fluid Systems

Abstract

Well killing is an important work in oil and gas exploration and development, and high - performance well killing fluids are critical to the success of this work. In order to increase the density of solid free and low damage well killing fluid system, environmental friendly high density solid free and low damage well killing fluid systems SWJ - 1, SWJ - 2 and SWJ - 3 with a density of 1.60, 1.70 and 1.80 g/cm3 respectively were prepared by means of adding synthesized filtrate reducer PT - 1, solvent increasing agent, scale inhibitor and deoxidizer into a compound weighting agent which was comprised of inorganic salt weighting agent JZJ - 1 and organic salt weighting agent JZJ - 2. The systems had a clear and transparent appearance, a pH value in the range of 10 ～ 12, and excellent temperature resistance, rheological properties, filtration performance and system compatibility. In addition, the macro and micro analyses showed that the systems possessed the characteristic of low corrosion, presenting a certain application prospect.

Keywords

• oil and gas exploration and development|filtrate reducer|well killing fluid system|corrosion performance