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High-temperature heat-response bentonite and high-temperature heat-response bentonite drilling fluid

A technology of bentonite and drilling fluid, which is applied in the field of high-temperature heat-responsive bentonite and high-temperature heat-responsive bentonite drilling fluid. Excellent thermal response, rheological stability

Active Publication Date: 2019-06-04
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention intends to solve the problem that the conventional bentonite-based film-forming technology cannot effectively prevent the loss of drilling fluid, and builds a thermally responsive polymer molecular brush on the surface of the bentonite. When the formation temperature is higher than the phase transition temperature of the polymer, the polymer molecular brush can self-polymerize , enhance the high temperature sealing performance of the mud cake

Method used

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  • High-temperature heat-response bentonite and high-temperature heat-response bentonite drilling fluid

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Experimental program
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Effect test

Embodiment 1

[0046] A kind of high temperature thermal response bentonite, the preparation method comprises the following steps:

[0047] Step 1, bentonite acid activation to build activation sites.

[0048] Mix 3g of bentonite with 100mL of 7wt% hydrochloric acid aqueous solution to dredge the clay pores, build hydroxyl adsorption sites, and improve the adsorption of bentonite.

[0049] Step 2, drying and processing the bentonite.

[0050] Dry the bentonite at 120-150°C for 10-24 hours to remove hydrochloric acid and moisture in the bentonite.

[0051] Step three, ATRP modification.

[0052] The activated bentonite was miscible with 0.5mL (3-aminopropyl)trimethoxysilane (ATMS) and 10mL of methanol, and magnetically stirred at 42°C for 12-16h to provide ATRP modified activation sites.

[0053] Then, 10 mL of dichloromethane (containing 2% (v / v) pyridine) and 5 mL of 2-bromoisobutyryl bromide were added for ATRP modification. During the ATRP modification, add a solution containing 5 g o...

Embodiment 2

[0057] A kind of high temperature thermal response bentonite, the preparation method comprises the following steps:

[0058] Step 1, bentonite acid activation to build activation sites.

[0059] Mix 1g of bentonite with 100mL of 10wt% hydrochloric acid aqueous solution to dredge the clay pores, build hydroxyl adsorption sites, and improve the adsorption of bentonite.

[0060] Step 2, drying and processing the bentonite.

[0061] Dry the bentonite at 120-150°C for 10-24 hours to remove hydrochloric acid and moisture in the bentonite.

[0062] Step three, ATRP modification.

[0063] The activated bentonite was miscible with 0.5mL (3-aminopropyl)trimethoxysilane (ATMS) and 10mL methanol, and magnetically stirred at 35°C for 12h to provide ATRP modified activation sites.

[0064] Then, 10 mL of dichloromethane (containing 3% (v / v) pyridine) and 5 mL of 2-bromoisobutyryl bromide were added for ATRP modification. During ATRP modification, add 5-10 mL of p-xylene containing 5 g of ...

Embodiment 3

[0068] A kind of high temperature thermal response bentonite, the preparation method comprises the following steps:

[0069] Step 1, bentonite acid activation to build activation sites.

[0070] Mix 3g of bentonite with 100mL of 15wt% hydrochloric acid aqueous solution to dredge the clay pores, build hydroxyl adsorption sites, and improve the adsorption of bentonite.

[0071] Step 2, drying and processing the bentonite.

[0072] Dry the bentonite at 120-150°C for 10-24 hours to remove hydrochloric acid and moisture in the bentonite.

[0073] Step three, ATRP modification.

[0074] The activated bentonite was mixed with 1mL (3-aminopropyl)trimethoxysilane (ATMS) and 40mL of methanol, and magnetically stirred at 45°C for 16h to provide ATRP modified activation sites.

[0075] Then, 20 mL of dichloromethane (containing 5% (v / v) pyridine) and 10 mL of 2-bromoisobutyryl bromide were added for ATRP modification. During ATRP modification, add a solution containing 10 g of phenyl ...

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Abstract

The invention provides high-temperature heat-response bentonite and a preparation method thereof, and a high-temperature heat-response bentonite drilling fluid. A high-temperature heat-response bentonite core is a rigid bentonite particle, and the exterior of the high-temperature heat response bentonite core is a flexible high-temperature heat-response molecular brush. The preparation method comprises the following steps: activating bentonite with an acid, drying, carrying out ATRP modification, rinsing and drying to obtain the high-temperature heat-response bentonite. The modification methodcomprises the following steps: mixing activated bentonite and a (3-aminopropyl) trimethoxysilane (ATMS) and methanol solution, carrying out magnetic stirring to provide a modified activation site, adding dichloromethane (containing (v / v) piperidine) and 2-bromoisobutyryl bromide to carry out ATRP modification, and meanwhile, adding phenyl methacrylate and p-xylene (copper bromide and N, N, N', N '', N '''-pentamethyldivinyl triamine), and stirring under nitrogen protection. The high-temperature heat-response bentonite is high in temperature sensitivity, the high-temperature self-healing capability is achieved, and the high-temperature plugging property of a mud cake is enhanced. The drilling fluid has the advantages of good self-repairing performance, stable rheological property, excellentheat responsiveness and excellent plugging property.

Description

technical field [0001] The invention relates to a high-temperature heat-responsive bentonite and a high-temperature heat-response bentonite drilling fluid, belonging to the technical field of drilling. Background technique [0002] Bentonite is an economical and environmentally important industrial raw material. Its main clay mineral component is montmorillonite, and its crystal structure is mainly composed of silicon-oxygen tetrahedron and aluminum-oxygen octahedron. Clay particles have a large specific surface area, are rich in hydroxyl polar adsorption groups, and have strong adsorption properties for chemical treatment agents and water molecules. Therefore, in recent years, scholars at home and abroad have widely used bentonite as the main raw material in film formation, which plays the role of protection, anti-seepage and anti-pollution. He Shichong used natural sodium-based bentonite as the main material to construct a geomembrane as an anti-seepage liner for landfill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C09K8/508C01B33/40C01B33/44
Inventor 蒲晓林董汶鑫任研君翟玉芬王梓豪冯雪飞高峰周欣瑜肖梦丽邱筱媛龚兴宇尹启新尹明宇郭文晴
Owner SOUTHWEST PETROLEUM UNIV
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