VISCOSITY REDUCTION OF VISCOELASTIC SURFACTANT BASED FLUIDS
摘要
Methods and compositions are disclosed for controlled addition of components that decrease the viscosity of the viscoelastic surfactant fluids or for controlled changes in the electrolyte concentration or composition of the viscoelastic surfactant fluids. One aspect of the invention relates to the u se of internal breakers with a delayed activation. Another aspect of the invention relates to the use of precursors that release a breaking system su ch as alcohol by a process such as melting, slow dissolution, reaction with a compound present in the fluid or added to the fluid during or after the step of injecting, rupture of an encapsulating coating and de-adsorption of a breaking agent absorbed into solid particles. In another aspect of the invention, alcohols are included in a pad to reduce the low-shear viscosity and reduce the resistance to flow of the treatment fluids during a desired phase of the treatment.
申请公布号
CA2405256(A1)
申请公布日期
2001.10.18
申请号
CA20012405256
申请日期
2001.04.03
申请人
SCHLUMBERGER CANADA LIMITED
发明人
TUSTIN, GARY J.;DISMUKE, KEITH;HUTCHINS, RICHARD;SAMUEL, MATHEW;FU, DIANKUI;PARRIS, MICHAEL;HUGHES, TREVOR L.;SALAMAT, GOLCHI;LUNGWITZ, BERNHARD;FLETCHER, PHILIP;LEE, JESSE C.;NELSON, ERIK B.