Study on the rheological properties of barite-free drilling mud with high density

Abstract

Improved drilling and reservoir penetration efficiency is directly related to the quality of the drilling mud used. The right choice of mud type and its components will preserve formation productivity, stability of the well walls and reduce the probability of other complications. Oil and gas operators use barite, less often siderite or hematite weighting agent as a weighting component in the composition of drilling muds for the conditions of increased pressure. But the use of these additives for the penetration of the productive formation leads to the reduction of filtration characteristics of the reservoir, as it is almost impossible to remove them from the pore channels. Therefore, barite-free drilling mud of increased density based on formic acid salts with the addition of carbonate weighting agent as an acid-soluble bridging agent is proposed. The results of experimental investigations on rheological parameters of barite-free solutions are given and the obtained data are analyzed. Based on the comparison of results it is recommended to use high-density drilling mud on the basis of formic acid salts (sodium and potassium formate) and with the addition of partially hydrolyzed polyacrylamide with molecular mass of 27 million.

Waste Management during the Production Drilling Stage in the Oil and Gas Sector: A Feasibility Study

“…Waste includes drilling mud, buffer fluid, and drill cuttings [13]. The drilling mud is selected based on the geological conditions of the producing formation and the physical and chemical properties of the hydrocarbons [14]. Drilling muds are classified into aqueous (highly colloidal clay or polymer muds), oil (diesel fuel or crude oil), pneumatic (compressed dry air, natural gas, aerosol, or foamed gas) and synthetic (vegetable esters, olefins, linear paraffins, simple esters, or acetals) [15][16][17][18].…”

A novel integrated methodology for screening, assessment and ranking of promising oilfields for polymer floods

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