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In the conditions of depletion of traditional energy resources, the development of hardto- recover hydrocarbon resources is becoming increasingly important in the world economy. One of these potential sources of tight gas can be in carbonate-clay fractured reservoirs of the Cambrian deposits of Kazakhstan, located at the depth of about 6 km.
The reservoir rocks consist of quartz, muscovite, albite, calcite, mixed layered clays, and chlorite. It is assumed that, the deposited particles from barite mud, which are used in deep drilling, can clog the cracks, thereby blocking the gas outlet. Cracks, acting as a filter, pass water, but block the particles from getting inside, causing a thick crust to form up to 5 mm of drilling fluid on the surface of the reservoir in the well, which makes it difficult to escape the gas.
The action on the barite mud crust of an aqueous solution of the Atren B-Solv complexing agents at a temperature of 100° C and background pressure of 20 MPa for 24 hours, almost completely dissolves the crust, partially leaving a clay fraction on the surface.Read more in the article.
Placement Source: International Scientific Council SGEM.