Method for inhibiting hydrate formation

A technology of hydrates and clathrate hydrates, applied in the direction of hydrocarbons, drilling compositions, chemical instruments and methods, etc., can solve the problems of handling, storage, recovery toxicity, etc.

Inactive Publication Date: 2001-03-21
EXXON PROD RES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such quantities present handling, storage, recycling and potential toxicity issues
Additionally, it is difficult to fully recover these solvents from manufacturing or delivery streams

Method used

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Examples

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Embodiment Construction

[0010] method invention

[0011] The method of the present invention inhibits the formation of clathrate hydrates in fluids having hydrate-forming components. Formation of clathrate hydrates means the nucleation, growth and / or condensation of clathrate hydrates. Whether such a clathrate hydrate is mobile or substantially stationary, it can be formed in a fluid, but tends to be most problematic in mobile fluid streams conveyed in pipes. For example, flow restriction caused by partial or complete blockage in a fluid stream occurs when scorpion hydrates adhere to and accumulate along the interior walls of pipes used to transport fluids. However, the present invention can be used to inhibit the formation of clathrate hydrates in substantially stationary fluids.

[0012] In one embodiment of the invention, a concentrated solution or mixture of one or more of the types of inhibitors described below is added to a petroleum fluid stream having an aqueous phase. Since the inhibitor ...

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Abstract

A method for inhibiting the formation of clathrate hydrates in a fluid having hydrate-forming constituents involves treating the fluid with an inhibitor comprising a substantially water soluble polymer having a polymer backbone with a pendant C1-C3 alkyl group; the polymer having an average molecular weight between about 1,000 and about 6,000,000. Preferably, the pendant alkyl group is a methyl group. The rate of nucleation, growth, and / or agglomeration of gas hydrate crystals in a petroleum fluid stream is reduced using the alkylated polymer backbone inhibitor, thereby inhibiting the formation of a hydrate blockage in the pipe conveying the petroleum fluid stream. Test results are disclosed which unexpectedly show that alkylating the polymer backbone with a methyl group will produce a subcooling for the alkylated polymer that is at least about 2 DEG F. (about 1.1 DEG C.) greater than its nonalkylated counterpart. The inhibitor can be used conveniently at low concentrations, for example in the range of from about 0.01% to about 5% by weight of the water present in the oil or gas stream, to effectively treat a petroleum fluid having a water phase.

Description

[0001] This application is based on co-pending U.S. Provisional Patent Application No. 60 / 000070 filed June 8, 1995 in the name of K.S. Colle et al. and related to co-pending U.S. Regular Patent Application No. 08 / 624277, which Based on U.S. Provisional Patent Application No. 60 / 0000065, and based on U.S. Provisional Patent Application No. 60 / 000071, each filed June 8, 1995. field of invention [0002] The present invention relates to a method of inhibiting the formation of clathrate hydrates in a liquid. In particular, the present invention relates to a method of suppressing the formation of gas hydrates in pipes used to transport oil or gas. Background of the invention [0003] Carbon dioxide, hydrogen sulfide, and various hydrocarbons such as methane, ethane, propane, n-butane, and isobutane are present in natural gas and other petroleum fluids. However, water is typically found mixed with such petroleum fluid components in various amounts. When such petroleum fluid con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D1/00C07C7/20C08F20/56C08F26/00C08F26/02C08F26/06C09K8/52C10L3/10F17D1/05
CPCC09K2208/22C09K8/52C10L3/10F17D1/05
Inventor K·S·科勒C·A·科斯泰洛L·D·塔利R·H·奥福克E·伯卢彻
Owner EXXON PROD RES CO
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