ALEXANDRIA, Va., March 19 -- United States Patent no. 12,252,957, issued on March 18, was assigned to SAUDI ARABIAN OIL COMPANY (Dhahran, Saudi Arabia).

"Pressure-pulsing for effective mudcake removal" was invented by Rayan A. AlRabaei (Jeddah, Saudi Arabia), Abdulhamid N. AlSousy (Dhahran, Saudi Arabia), Akram R. AlBarghouti (Dammam, Saudi Arabia) and Mohammed H. AlKhaldi (Dammam, Saudi Arabia).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for clearing an obstruction in a wellbore may include opening a first choke that is in fluid communication with the wellbore. This may create a first pressure in the wellbore. The first choke may then be closed. If the choke is adjustable, the choke size may be a...