Applicability of a new type of ceramic screen in the sand producing gas wells in Keshen gas reservoir

Keshen gas reservoir is characterized by large burial depth, high temperature, high pressure and corrosion gas of high CO₂ content and its gas wells are of high yield and strong erosion. As a result, the metal screen which is commonly used in oilfields cannot satisfy the need of sand control after sand is produced in the gas wells. A new type of ceramic screen was selected after the sand control cases of similar sand producing wells in foreign countries were analyzed. In addition, its applicability and running feasibility to the gas wells in Keshen gas reservoir were analyzed from the aspects of downhole CO₂ corrosion, acid corrosion and sand erosion. It is indicated that this new type of ceramic screen can satisfy the needs of sand control under the erosion of high-speed sand carrying fluid in the environment of high temperature, high CO₂ content and strong acid corrosion in Keshen Block. The slot size of existing ceramic screen can reach the sand control precision of sandstone reservoir in Keshen gas reservoir. Ceramic screen is structurally simple overall and its completion skin factor after running into the hole is low and can satisfy the stimulation needs of Keshen Block. The mechanical strength of the ceramic screen can bear the downhole confining pressure in Keshen gas reservoir, and its bending strength is high enough to ensure the running feasibility in ultra deep gas wells. It is concluded that this new type of ceramic screen is advantageous with strong erosion resistance, high temperature resistance, corrosion resistance and low completion skin factor and its application prospect to sand control completion in Keshen gas reservoir is promising.