Di-kalium ion-polymer drilling fluid with strong rejection capability

Abstract

The invention relates to a strong inhibition double-kalium ion, namely polymer drilling fluid, which is characterized in that the strong inhibition double-kalium ion, namely polymer drilling fluid comprises the following materials in weight percentage: A. 7 to 9 percent of inorganic kali salt used as an inorganic inhibitor; B. 0.5 to 0.6 percent of organic kali salt used as an organic inhibitor; C. 0.3 to 0.5 percent of viscidity improving agent; D. 0.3 to 0.5 percent of filter loss reducing agent; E. 0.3 to 0.5 percent of alkalinity controlling agent; F. 0.03 to 0.1 percent of preservative agent; G. 0.1 to 0.2 percent of antifoaming agent; H. 1 to 8 percent of weight additive; and the balance being water. The drilling fluid has stronger functions of inhibiting hydration, expansion and dispersion of clay mineral, and also has better rheological property, so that the drilling fluid is low filter loss non-solid phase polymer drilling fluid.

Description

technical field [0001] The invention belongs to a drilling fluid, in particular to a water-based drilling fluid with strong inhibitory dipotassium ion-polymer drilling fluid that inhibits the hydration expansion of mud shale. Background technique [0002] As we all know, drilling fluid is the blood of drilling and plays a very important role in oil drilling. Water-based drilling fluid has experienced the development process from coarse dispersion drilling fluid, fine dispersion drilling fluid to non-dispersion drilling fluid. At present, coarse dispersion and fine dispersion drilling fluid systems are mostly used in drilling operations. This system has the following disadvantages: high solid phase content, low mechanical penetration rate, easy hydration expansion and cross collapse of mudstone, resulting in wellbore shrinkage. diameter, the tripping and tripping encounter resistance or the torque is too large when drilling, and in severe cases, the well wall collapses, and ...

AI Technical Summary

Problems solved by technology

At present, coarse dispersion and fine dispersion drilling fluid systems are mostly used in drilling operations. This system has the following disadvantages: high solid phase content, low mechanical penetration rate, easy hydration expansion and cross collapse of mudstone, resulting in wellbore shrinkage. diameter, the tripping and tripping encounter resistance or the torque is too large when drilling, and in severe cases, the well wall collapses, and even the downhole accidents such as falling of the drilling tool are caused by the collapse

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