发明名称 |
Well drilling and servicing fluids and methods of increasing the low shear rate viscosity thereof |
摘要 |
<p>A well drilling and servicing fluid comprising a brine having dissolved therein a formate salt selected from the group consisting of potassium formate, cesium formate, and mixtures thereof, a biopolymer viscosifier, and a pre-gelatinized amylopectin derivative, and optionally a bridging agent and magnesium oxide. The amylopectin starch derivative is a crosslinked amylopectin starch (waxy) which has been crosslinked to the extent that the viscosity of an aqueous amylopectin starch suspension undergoing crosslinking is within about 25% to about 60%, preferably from about 25% to less than about 50%, of the maximum viscosity which can be obtained, and gelatinized.</p><p>A process of increasing the low shear rate viscosity at ambient temperatures of the aqueous formate brine which comprises adding to the brine a biopolymer and the pre-gelatinized crosslinked amylopectin starch in amounts such that they interact to synergistically increase the low shear rate viscosity of the brine.</p> |
申请公布号 |
EP0884369(A1) |
申请公布日期 |
1998.12.16 |
申请号 |
EP19980304506 |
申请日期 |
1998.06.08 |
申请人 |
TEXAS UNITED CHEMICAL COMPANY, LLC. |
发明人 |
CASHION, JAMES P.;DOBSON, JAMES W.;BELLEW, BRANDON B. |
分类号 |
C09K8/08;C09K8/90;(IPC1-7):C09K7/02;E21B43/25 |
主分类号 |
C09K8/08 |
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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