E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/22 (2006.01) C09K 8/62 (2006.01) C09K 8/74 (2006.01)
Patent
CA 2217659
The improved recovery of hydrocarbons from subterranean formations by hydraulically fracturing a subterranean formation is accomplished. Fracturing fluids using a viscoelastic surfactant fluid containing wormlike micelles are useful to improve recovery of hydrocarbons and limit the loss of fracturing fluid into the formation fracture face. The invention further relates to novel fracturing methods useful for increasing hydrocarbon production, limiting connate water production, resisting fracturing fluid loss into the subterranean formation, and reducing the equipment requirements in mixing and pumping fracturing fluid. The action of micelles of surfactant in aqueous zones of the subterranean formation facilitates the flowback of increased amounts of hydrocarbons once a fractured well is placed back on production.
Cette invention concerne une méthode améliorée d'extraction d'hydrocarbures faisant appel à la fracturation hydraulique des formations souterraines. L'emploi de liquides de fracturation additionnés d'agents tensio-actifs visco-élastiques renfermant des micelles vermiformes rehausse le rendement d'extraction tout en limitant les pertes de liquides de fracturation dans la formation à exploiter. L'invention concerne en outre des méthodes novatrices de fracturation permettant de hausser la production, de limiter l'extraction d'eau de gisement, d'éviter les pertes de liquide de fracturation dans la formation souterraine et de réduire les besoins en équipement de mélange et de pompage desdits liquides de fracturation. Les micelles de l'agent tensio-actif ont pour effet de favoriser la remontée de quantités accrues d'hydrocarbures dans les zones aquifères, une fois le puits remis en production.
Brown J. Ernest
Card Roger J.
Nelson Erik B.
Schlumberger Canada Limited
Smart & Biggar
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