Hydrate inhibitor polymer and preparation method

A hydrate inhibitor and polymer technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of high cost, and achieve the effects of improving temperature resistance, strong adsorption, and simple and feasible preparation methods

Inactive Publication Date: 2010-09-01
SOUTHWEST PETROLEUM UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Although all oil-based drilling fluids can reduce the formation of hydrates (WilliEM Halliday. New Gas Hydrate Inhibitors for Deepwater Drilling Fluids. IDAC/SPE 39316, 201-211; Ning Fulong, Zhang Ling, Jiang Guosheng, etc. in deepwater oil-based drilling fluids Experimental research on inhibiting hydrate formati

Method used

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  • Hydrate inhibitor polymer and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example 1 Preparation method of EM / ACD / DMDAAC / NVP polymer

[0018] Take 3.8mL of 0.5g / mL dimethyldiallylammonium chloride (DMDAAC) aqueous solution in a 150mL beaker, accurately add 1.2g of ethyl methacrylate (EM) under magnetic stirring, and then stir at high speed for 10-20min Make it a lotion.

[0019] The above emulsion and 5 mL of NVP aqueous solution with a concentration of 0.5 g / mL were added to 50 mL of an allyl β-cyclodextrin (ACD) aqueous solution with a concentration of 0.01 g / mL. Then, 0.6g disodium ethylenediaminetetraacetic acid (EDTA) chelating agent, 0.6g potassium persulfate oxidizing agent and 0.6g sodium bisulfite reducing agent were added in sequence. Fully stir and mix on a magnetic stirrer, then fill with nitrogen for 40 minutes to remove oxygen, and react at 50°C for 9 hours to obtain EM / ACD / DMDAAC / NVP quaternary polymer.

[0020] Determine the intrinsic viscosity of the EM / ACD / DMDAAC / NVP polymer according to the standard described in GB12005.1-89, and...

Example Embodiment

[0021] Example 2 The inhibitory effect of EM / ACD / DMDAAC / NVP polymer in drilling fluid hydrate

[0022] In order to evaluate the inhibitory effect of EM / ACD / DMDAAC / NVP polymers on hydrates in drilling fluids, a visual high-pressure fluid testing system was used. The system consists of an autoclave with sapphire double windows, a constant temperature bath, a temperature control system, a pressure control system and a measurement system.

[0023] Although the formation of hydrate can be observed through a window, the present invention uses sudden changes in pressure and temperature in the kettle to judge. Because the hydrate formation reaction is exothermic, the temperature will rise and the pressure will drop significantly. The experimentally determined hydrate formation time is the time from when gas is introduced into the kettle and the pressure is constant at 16Mpa to the point of pressure drop.

[0024] The polymer evaluation of the present invention is carried out separately in ...

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Abstract

The invention relates to a hydrate inhibitor polymer used in petroleum marine deep water drilling fluid and a preparation method. The hydrate inhibitor polymer for the petroleum marine deep water drilling fluid can capture natural gases permeated in the drilling fluid to form super molecular combinations and achieve effect of high effectively inhibiting the hydrates. The technical scheme is that the hydrate inhibitor is a polymer consisting of ethyl methacrylate (EM), allylcyclodextrin (ACD), dimethyldiallylammonium chloride (DMDAAC) and N-Vinylpyrrolidone (NVP); EM is added into the DMDAAC aqueous solution while stirring, high speed stirring is carried out for 10-20 min to form an emulsion, and the emulsion and the NVP solution are added in the ACD aqueous solution; a chelating agent, an oxidant and a reductant are added in turn; at last, nitrogen is charged for 20-40 min after evenly stirring and mixing for deoxygenation, and the reaction is carried out for 6-12 h at a temperature of 30-60 DEG C to obtain the hydrate inhibitor polymer product. The polymer has the advantages of simple and feasible preparation method, moderate reaction condition and good hydrate inhibiting effect. The polymer is used in the petroleum marine deep water drilling fluid.

Description

technical field [0001] The invention relates to a hydrate inhibitor polymer used in marine deep water drilling fluid of petroleum and natural gas drilling engineering and a preparation method. Background technique [0002] With the development of oil and gas exploration and development to the ocean, the number and depth of offshore drilling are increasing year by year. When drilling in fractured formations during offshore deepwater drilling operations, the drilling fluid can easily form hydrates with formation natural gas, hindering well control operations. Although all oil-based drilling fluids can reduce the formation of hydrates (WilliEM Halliday. New Gas Hydrate Inhibitors for Deepwater Drilling Fluids. IDAC / SPE 39316, 201-211; Ning Fulong, Zhang Ling, Jiang Guosheng, etc. in deepwater oil-based drilling fluids Experimental research on inhibiting hydrate formation, Acta Petroleum Sinica, 2009, 30 (5) 440-443), but the cost is significantly higher than that of water-base...

Claims

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Application Information

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IPC IPC(8): C08F226/10C08F220/18C08F226/02C08F216/14C08B37/16C09K8/24C09K8/12C09K8/20C09K8/08
Inventor 邹长军张锐张凌志张菊
Owner SOUTHWEST PETROLEUM UNIV
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