Preservation of the filtration capacity of the formation by increasing the strength of the crust and colmatating ability of the drilling fluid
Abstract
Abstract The insufficient density and low strength of the mudcake does not ensure the complete cessation of drilling fluid penetration into the reservoir capillary volume. At the same time, the penetrating components of the solutions, upon contact with the formation components, lead to clogging of the capillary volume due to physicochemical processes. The experiments were carried out on cores made from carbonate rocks of a similar composition of the productive formation and on artificial cores made from carbonate rocks, 30 mm in diameter and 40 mm long. The initial gas permeability of artificial samples was approximately the same (3.6-3.7 m) According to the results, the high strength of the colmatation barrier created by WC-Y736-A polyethylene powder and the low strength of the bonfire-kenaf and cotton cellulose. The resulting deep clogging of the pores and sufficient strength of the polyethylene colmatation barrier was achieved due to their high degree of swelling and physico-chemical effect of the colmatant with the rock.