公开(公告)号：US09803132B2

公开(公告)日：2017-10-31

申请号：US14768874

申请日：2014-02-18

Applicant: CHEVRON U.S.A. INC.

Inventor： Michael James Fuller ,  Maricel Marquez ,  William David Norman

IPC: E21B43/267 ,  C09K8/80 ,  C09K8/68 ,  E21B43/26

CPC classification number: C09K8/685 ,  C09K8/80 ,  C09K2208/10 ,  E21B43/26 ,  E21B43/267

Abstract: A method includes placing a treatment fluid including a crosslinked gel in a wellbore penetrating a subterranean formation, the crosslinked gel including a gelling agent and a borate crosslinking agent, de-crosslinking a portion of the crosslinked gel, the de-crosslinking induced by a sufficient change in operating pressure, the de-crosslinking providing a release of active sites on the borate crosslinking agent and reducing the viscosity of the treatment fluid, and providing a borate-affinity agent to capture the released active sites on the borate crosslinking agent. A fracturing fluid includes a gelling agent, a borate crosslinking agent, a latent borate-affinity agent, and a proppant.