A Drying Agent for Reducing Water Locking Effect in Tight Reservoirs

Abstract

A drying agent for reducing a tight reservoir water blocking effect is composed of a nanometer drying main agent, a dispersing agent and a synergist. The nanometer drying main agent is composed of aluminum carbide and sodium acetylide. The dispersing agent is a low molecular weight organic solvent. The synergist is a mixture of an anti-settling stabilizer, tackifier and potassium carbonate at any proportion. A method for manufacturing the drying agent comprises the steps of mixing aluminum carbide and sodium acetylide at a proportion of 1:4, dispersing the mixture, adding the synergist, and obtaining the nanometer drying agent after high-speed stirring. After the drying agent consumes formation water, sodium metaaluminate in a formation water reaction resultant is dissolved in remaining formation water, methane and acetylene in the products are gas and are discharged along cracks, no new blocking object is generated on the basis of eliminating the formation water, and the drying agent is very high in efficiency, clean and environmentally friendly.

Description

technical field The invention relates to the technical field of oil and gas field development, in particular to a drying agent for reducing the water locking effect of tight reservoirs. Background technique Due to the characteristics of tight reservoirs such as small pore throat radius, high primary water saturation, and developed natural fractures, such reservoirs show high damage potential and are prone to capillary self-imbibition, so the dry core permeability of tight gas reservoirs is often It is more than 10 times the permeability of cores containing irreducible water. This difference is mainly caused by the geological characteristics of tight gas reservoirs. On the one hand, the pore throat radius of tight reservoirs is small; And the intrusion of foreign fluids leads to high water saturation in the reservoir, which leads to a large number of pore throats being blocked by water film, and the gas flowability in the reservoir becomes poor. This increase in irreducible ...

AI Technical Summary

Problems solved by technology

With the method of the existing technology, the formation water itself is still not consumed, and the problem of water lock cannot be solved from the root cause. If the passive physical driving effect is not good, the formation water will still affect the gas flow in the rock fractures

Images