公开(公告)号：US10584569B2

公开(公告)日：2020-03-10

申请号：US15955125

申请日：2018-04-17

Applicant: CONOCOPHILLIPS COMPANY

Inventor： Siluni L. Gamage ,  T. J. Wheeler ,  Robert S. Redman

IPC: E21B43/24

Abstract: A method starts wells with electrical downhole heating and injects solvent(s) or NGL mixes as a preconditioning for a steam injection process. The downhole electrical heating and solvent injection recovers oil and reduces the reservoir pressure. Once oil has been recovered for a period of time and the operating pressure and temperature has been reduced, steam or steam and solvent(s) may be injected to produce high oil recoveries at faster production rates than downhole heating or downhole heating and solvent(s) injection alone. The method reduces heat losses due to steam injection at lower pressure and temperature and therefore, improves efficiency and lowers operating costs. Operating at lower pressure and temperature also reduces the risk of melting the permafrost and consequent well failure issues.

公开(公告)号：US10161221B2

公开(公告)日：2018-12-25

申请号：US14557709

申请日：2014-12-02

Applicant: CONOCOPHILLIPS COMPANY

Inventor： James A. Mills ,  Robert S. Redman ,  David L. Lee

IPC: E21B36/00 ,  E21B43/24

Abstract: A method and system for insulating wells using dual concentric vacuum insulated tubing layers with joints staggered with respect to one another. The method can be combined with other insulating methods, and well as with other subsidence mitigation techniques.