发明名称 |
pH DEPENDENT PROCESS FOR RETARDING THE GELATION RATE OF A POLYMER GEL UTILIZED TO REDUCE PERMEABILITY IN OR NEAR A SUBTERRANEAN HYDROCARBON-BEARING FORMATION |
摘要 |
A process and composition are provided for permeability reduction in a treatment region to improve hydrocarbon recovery from a hydrocarbon-bearing formation. The process includes placement of a crosslinked polymer gel in the treatment region preceded by surface preparation of a gelation solution which is the gel precursor. The gelation solution contains a crosslinkable polymer, a chromium(III)/carboxylate complex crosslinking agent, a carboxylate salt delaying agent and an aqueous solvent. The gel is placed in the treatment region by injecting the gelation solution into a well bore in fluid communiction with the treatment region, displacing it into the desired treatment region and gelling the solution to completion forming the permeability-reducing gel in situ. The gelation rate is retarded in a controlled manner by adjusting the composition or concentration, and correspondingly the pH, of the delaying agent in the gelation solution. |
申请公布号 |
WO9518910(A2) |
申请公布日期 |
1995.07.13 |
申请号 |
WO1994US14999 |
申请日期 |
1994.12.29 |
申请人 |
MARATHON OIL COMPANY;SYDANSK, ROBERT, D. |
发明人 |
SYDANSK, ROBERT, D. |
分类号 |
C09K8/512;(IPC1-7):E21B33/138;E21B43/25 |
主分类号 |
C09K8/512 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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