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Thermally stable scale inhibitor compositions

A composition and anti-scaling technology, which can be used in drilling compositions, water heaters, fluid heaters, etc., to solve problems such as reduced efficacy

Active Publication Date: 2018-01-02
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although water-soluble polymer antiscalants that include aliphatic sulfonic acids (i.e., vinyl sulfonate) in their backbones show good inhibition of calcite formation, when heat aged at moderate to high temperatures , the inhibitor showed a marked reduction in potency

Method used

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  • Thermally stable scale inhibitor compositions
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  • Thermally stable scale inhibitor compositions

Examples

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Effect test

example

[0046] Aqueous antiscalant solutions comprising a polycarboxylic acid copolymer of the invention (Example 1 ) and a polycarboxylate copolymer not of the invention (Comparative Example A) were evaluated in a test brine solution for inhibition effectiveness. Evaluations were performed on samples prepared at ambient conditions and on samples that had been aged under pressure in a Parr reactor at 200°C for five days. For each of Comparative Example A and Example 1, five different samples including varying antiscalant concentrations: 2, 4, 6, 10, and 20 parts per million (ppm) antiscalant were evaluated.

[0047] The antiscalant evaluated in Example 1 was a low molecular weight polyacrylic acid copolymer comprising 75% by weight acrylic acid and 25% by weight styrene sulfonic acid with a weight average Mw of about 27,000 Daltons).

[0048] The antiscalants evaluated in Comparative Example A were low molecular weight polyacrylic acid copolymers, including those available as ACCENT® ...

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Abstract

The present invention relates to a thermally stable polymeric scale inhibitor compositions and use thereof. Preferably, the polymeric scale inhibitor is a polycarboxylic acid copolymer comprising a styrene sulfonic acid group. The polymeric scale inhibitor compositions of the present invention are particularly suitable for high pressure / high temperature scale inhibition treatment of oil and gas production wells and / or subterranean formations.

Description

technical field [0001] The present invention relates to a thermally stable polymer antiscalant composition and its use. The polymeric antiscalant compositions of the present invention are particularly suitable for high pressure / high temperature applications. Background technique [0002] Antiscalant polymers are often used in water treatment and oilfield applications to minimize and / or prevent scale deposition. Deposition of scale can occur in the transport of aqueous mixtures and in subterranean formations due to the presence of aqueous alkaline earth metal cations such as calcium, barium, strontium, and anions such as phosphate, sulfate, carbonate, silicate, etc. When these ions are in sufficient concentration, deposits can form that accumulate on the interior surfaces of pipelines used for transportation or in subterranean formations, which restrict the flow of the target medium (eg, water or oil). [0003] In oilfield applications, commonly formed scales include calciu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/10C09K8/528C09K8/592
CPCC09K8/528C09K8/592C02F5/10C02F5/02E21B43/16F24H1/00C08F2500/02C08L25/18C08L33/02C08L41/00C09K8/524E21B37/06
Inventor A·I·帕迪利亚-阿塞韦多
Owner DOW GLOBAL TECH LLC