Controlling the formation of crystalline hydrates in fluid systems

a technology of crystalline hydrate and fluid system, which is applied in the direction of pipeline system, chemistry apparatus and processes, other chemical processes, etc., can solve the problems of preventing or controlling the formation of hydrates, affecting the economic benefits of the operation, and affecting the operation of the pipelin

Inactive Publication Date: 2006-10-05
GRAHAM DAVID E
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] Thus, there is a need for an economical, highly efficient process for controlling the formation of crystalline hydrate crystals in various fluid systems,

Problems solved by technology

These solid hydrates, once formed, will grow in size to eventually plug flow lines, and have high potential to block fluid flow and in the worst case cause rupture of the pipe line.
Thus, the formation of hydrates is a costly and potentially environmental challenge for the oil and gas industry.
As global offshore deepwater production of oil and gas increases, the challenges of preventing or controlling the formation of hydrates remains the industry technical challenge.
Of these, methanol, ethanol and glycol are currently practiced but the environmental and financial costs are high.
The costs are high but the logistics for supply and s

Method used

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Examples

Experimental program
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Effect test

examples 2 to 10

[0033] The protocol was identical to that carried out under Example 1, except that 2500 ppm of the corresponding inhibitor was added to the test solution unless stated otherwise. The simple evaluation was carried out identically to that set forth in Example 1 above. The test thus used the same protocol as above with the hydrate anti-agglomerate additives shown in the table below. Examples 2 to 5 correspond to the prior art whereas Examples 6 and 7 relate to the process substrates without hyperbranched polymer coating and Examples 8 through 10 relate to inhibitors designed according to this invention that are silica substrates that have the polymer immobilized on the surface.

HydrateExampleConcentrationGrowth #Inhibitorppm by weightRate gm / hour1NilNil˜252methanol2500˜243isobutanol2500˜1042-butoxyethanol25004.652-isobutoxyethanol250011.2690 micron silica2500˜25720 nm silica2500˜20890 micron silica + 10%250012hyperbranched polymer9Product 1 = 20 nm25001.1silica + 10%hyperbranched poly...

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Abstract

Controlling the formation of crystalline hydrates in various fluid systems, most notably, gas and oil transmission pipeline systems by contacting the systems with certain polymers or polymers associated with solid particles. The polymers useful are chelating polymers capable of interacting with charged gaseous molecules such as carbon dioxide, by removing the carbon dioxide, or more practically by scavenging for the carbon dioxide, to prevent the methane or ethane hydrate structures from forming since they require carbon dioxide to stabilize their structures.

Description

BACKGROUND OF THE INVENTION [0001] The invention disclosed and claimed herein deals with compositions that control the formation of crystalline hydrates in various systems, most notably, gas and oil transmission pipeline systems. The compositions are comprised of carbon dioxide sorbing polymers that also have the capability of driving the formation of hydrate crystals into the polymeric matrix. [0002] Crystalline hydrates can form in oil and gas pipelines carrying oil and gas if the chemical composition of the produced fluids includes water, either or both of ethane or methane with carbon dioxide and sometimes, other hydrocarbon gases and / or sulfur dioxide. In addition to the chemical composition, there is a need for a driving force for such hydrate nucleation involving the physical and environmental conditions. [0003] The fluid composition generally is at an elevated temperature, typically above 70° C. and it will cool to a lower temperature, typically below 16° C., whereby the gas...

Claims

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Application Information

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IPC IPC(8): C10L1/32C09K3/00C10GF17D1/05
CPCC09K8/52F17D1/05C10L3/003C09K2208/22
Inventor GRAHAM, DAVID E.
Owner GRAHAM DAVID E
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