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Acrylamide/polymerizable microsphere composite gel as well as preparation method and application thereof

A technology of acrylamide and polymerized microspheres, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of long gel formation time, difficult injection into wellbore, high viscosity of gel base fluid, etc., and can achieve tensile stress. And the effect of high compressive stress, strong adhesion and good mechanical strength

Inactive Publication Date: 2020-08-18
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the disadvantages that the viscosity of the gel base fluid of the existing polymer composite gel is too large, it is difficult to inject into the wellbore, and the long gelation time required to achieve the ideal high strength is provided. Acrylamide / polymerizable microsphere composite gel and its preparation method and application

Method used

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  • Acrylamide/polymerizable microsphere composite gel as well as preparation method and application thereof
  • Acrylamide/polymerizable microsphere composite gel as well as preparation method and application thereof
  • Acrylamide/polymerizable microsphere composite gel as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0066] Embodiment 1 The preparation of AM / HEMA (acrylamide / hydroxyethyl methacrylate) copolymerized microspheres

[0067] Acrylamide / hydroxyethyl methacrylate copolymerized microspheres (AM / HEMA copolymerized microspheres) were synthesized by low temperature inverse microemulsion method. The specific method is as follows: first prepare the oil phase, weigh a certain amount of Span 80 (span 80), Tween 60 (Tween 60) and No. 10 white oil in a three-neck flask, stir in a water bath at 50 ° C for 0.5 h at a constant temperature, The rotating speed is 300r / min; then the water phase is prepared, and a certain amount of acrylamide (AM), hydroxyethyl methacrylate (HEMA), N,N-methylenebisacrylamide (MBA), over Potassium sulfate (KPS), deionized water, stirred at room temperature until completely dissolved; then, at 20°C, add the water phase to the oil phase dropwise at a rate of 2-3 drops / s, and the stirring rate is 500r / s min, after emulsification for 0.5h, cool down to 18°C, add sodi...

Embodiment 2

[0070] The processing of embodiment 2 AM / HEMA copolymerized microspheres

[0071] Weigh 2g of the AM / HEMA copolymerized microspheres prepared in Example 1 in a three-necked flask, add 40mL of acetone as a solvent, and stir for 0.5h at 40°C and 300r / min, then add 5mL of methacryloyl chloride, continue Stir for 0.5h, add 0.05g anhydrous Na 2 CO 3 ;Continue to stir and react for 12h; then wash with deionized water for 3 times, and continue to centrifuge with a centrifuge to obtain the desired microspheres, because the surface of the microspheres contains carbon-carbon double bonds, which can be polymerized with itself or acrylamide monomers , so named polymerizable AM / HEMA copolymer microspheres.

Embodiment 3

[0072] Example 3 Preparation of acrylamide / polymerizable microsphere composite gel

[0073] Slowly add microspheres while stirring in deionized water (one is the AM / HEMA copolymerized microspheres (WQ) prepared in Example 1, and the other is the polymerizable AM / HEMA copolymerized microspheres (CQ) prepared in Example 2 ), ultrasonically oscillated for 20 min and then stirred for 30 min to ensure a uniform solution. Add acrylamide to the above solution and continue to stir for 2h, then add 0.04wt% N,N-methylenebisacrylamide and 0.04wt% potassium persulfate, and continue to stir for 30min. The cross-linking system was kept at a constant temperature of 70° C. for 4 hours to obtain an acrylamide / polymerizable microsphere composite gel. The specific formulation of the acrylamide / polymerizable microsphere composite gel is shown in Table 2 and Table 3.

[0074] Table 2 Acrylamide / AM / HEMA copolymerized microsphere composite gel formula

[0075]

[0076] Table 3 Acrylamide / Polym...

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Abstract

The invention discloses acrylamide / polymerizable microsphere composite gel as well as a preparation method and application thereof, and belongs to the technical field of oilfield chemistry. The acrylamide / polymerizable microsphere composite gel is prepared from the following raw materials in percentage by mass: 2-10% of acrylamide, 0-6% (0 is not inclusive) of polymer microspheres, 0.02-0.1% of across-linking agent, 0.02-0.08% of an initiator; and the balance being water. The acrylamide / polymerizable microsphere composite gel has good mechanical strength, high tensile stress and compressive stress, and strong adhesive force, moreover, the base fluid viscosity is low, and thus the composite gel can be easily inject into a wellbore, and has a good application prospect.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to an acrylamide / polymerizable microsphere composite gel and its preparation method and application. Background technique [0002] Underbalanced drilling technology is a new drilling technology that developed rapidly in the 1990s and was widely used. Before the 1990s, oil companies in the United States mainly used conventional oil and gas layer protection technologies such as oil-based drilling fluids and water-based drilling fluids with high costs; after the 1990s, underbalanced drilling and horizontal well drilling technologies were widely used. The application mainly includes methods such as gas drilling, foam drilling, atomization drilling, air-filled drilling, etc., which method to choose depends on the characteristics of the reservoir. Foreign underbalanced drilling technologies mainly focus on drilling fluid, program design, well control, special tools and so on. The under...

Claims

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Application Information

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IPC IPC(8): C08J9/40C08F220/56C08F220/20C08F222/38C08F2/34C09K8/035C08L33/26
CPCC08F2/34C08F220/56C08J9/405C08J2333/26C09K8/035C09K2208/10C08F220/20C08F222/385
Inventor 林梅钦张储桥杨子浩董朝霞张娟
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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