METHOD OF DRILLING WELLS WITH ACTIVE BRINE MANIFESTATION Russian patent published in 2024 - IPC E21B43/12 E21B21/08 E21B43/00 

FIELD: oil and gas industry.

SUBSTANCE: technology for eliminating brine manifestations. The method of drilling wells with active brine manifestations includes drilling to the roof of the brine-bearing formation, running and cementing the casing, pressure testing of the casing, opening and drilling of the brine-bearing formation. A pre-prepared cross-linking solution is pumped into the well, the well is kept under pressure for a period of time to prevent the drill string from sticking, an impenetrable screen is formed in the brine=bearing formation as a result of sedimentation after the chemical interaction of the cross-linking solution with formation water in the brine-bearing zone, and monitoring of success of operations to ensure circulation in the well when mud pumps are not working is carried out. In this case, opening and drilling is carried out with back pressure. Backpressure is created and controlled by gradually closing the annular space at the wellhead using the ram preventer's hand wheels. The amount of back pressure is regulated by the degree of overlap of the annular space. In case of excessive intensity of brine manifestation, back pressure is increased. Once an impenetrable screen has formed, back pressure is reduced.

EFFECT: improved reliability of isolation of fractured pressure strata.

1 cl, 3 dwg