Wells – Processes – Distinct – separate injection and producing wells
Reexamination Certificate
2007-12-25
2007-12-25
Bagnell, David (Department: 3672)
Wells
Processes
Distinct, separate injection and producing wells
C166S309000
Reexamination Certificate
active
10905993
ABSTRACT:
An apparatus and method for injecting surfactant into a well for coal bed methane (CBM) recovery, tight sand gas extraction, and other gas extraction techniques provides for the mixing of surfactant and water near the downhole end of the well, maximizing water removal for gas recovery. The apparatus may include a check valve that feeds a nozzle to atomize the spray of surfactant into the well production tube. Surfactant is not sprayed directly into the formation, thereby protecting the formation from damage and recovering surfactant even in the case where water is not present. The capillary tube feeding surfactant to the check valve may be placed externally to the production tube to facilitate ease of cleaning and clearing of the production tube.
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