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Polyacrylamide/microsphere composite gel and preparation method thereof

A technology of polyacrylamide and composite gel, which is applied in the field of polyacrylamide/microsphere composite gel and its preparation, and can solve the problems of reservoir damage and expensive construction costs

Active Publication Date: 2018-04-13
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic jelly is used to form a high-strength colloid section in the wellbore between the middle of the reservoir and the bottom of the tubing string to achieve safe isolation of the wellbore during drilling, completion and workover, and to separate mud, drilling fluid and storage Layers can be effectively separated, which can effectively prevent the killing fluid from entering the formation, and at the same time prevent the hydrogen sulfide and other gases accumulated in the formation from escaping.

Method used

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  • Polyacrylamide/microsphere composite gel and preparation method thereof
  • Polyacrylamide/microsphere composite gel and preparation method thereof
  • Polyacrylamide/microsphere composite gel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1, the preparation of acrylamide / hydroxyethyl methacrylate composite microspheres (AM\HEMA composite microspheres)

[0041] AM\HEMA composite microspheres were synthesized by low temperature inverse microemulsion method.

[0042] First prepare the oil phase, weigh a certain amount of span80, tween60 and No. 10 white oil in a three-necked flask, stir in a water bath at 50 ° C for 0.5 h at a constant temperature, and the rotation speed is 350 r / min. In the oil phase, the mass fraction of span80 is 22.09 %, the mass fraction of tween60 is 12.47%; then the water phase is prepared, and a certain amount of AM, HEMA, MBA, KPS, deionized water is weighed in a beaker, and stirred at room temperature until completely dissolved; then at 20°C, the The water phase is added dropwise to the oil phase at a rate of 2-3 drops / s. At this time, the stirring rate is 350r / min. After emulsification for 0.5h, cool down to 18°C, observe the heating process, record the highest tempera...

Embodiment 2

[0046] Embodiment 2, the preparation of polyacrylamide / microsphere composite gel

[0047]Add 2 g of 10% thiourea solution to the deionized water solution, and slowly add the acrylamide / hydroxyethyl methacrylate composite microspheres prepared in Example 1 under stirring conditions, ultrasonically oscillate for 20 minutes and then stir for 30 minutes to make the solution as uniform as possible. Afterwards, 2 g of HPAM powder was added to the above suspension and continued to stir for 4 h, and then 2 g of chromium acetate aqueous solution with a mass concentration of 10% was added to the above mixture and continued to stir for 30 min. The cross-linking system was gelled at a constant temperature of 70° C. for 3 hours to obtain a polymer composite gel.

[0048] According to the above steps, keep the mass fraction of HPAM and chromium acetate constant, and change the concentration of acrylamide / hydroxyethyl methacrylate composite microspheres from 0% to 10%, to investigate the inf...

Embodiment 3

[0053] Embodiment 3, the mechanical performance test of polyacrylamide / microsphere composite gel

[0054] 1. Scanning electron microscope

[0055] Use the scanning electron microscope (SEM) mode of the Quanta 200F environmental scanning electron microscope to observe the cross-sectional structure of the gel sample, freeze the sample with liquid nitrogen, dry it, spray gold, and then observe.

[0056] The microscopic morphology of acrylamide / hydroxyethyl methacrylate composite microspheres and microspheres / polyacrylamide composite gel was observed by scanning electron microscopy, as shown in figure 1 (A) and figure 1 (B) shown.

[0057] The morphology of acrylamide / hydroxyethyl methacrylate composite microspheres is shown. The size of acrylamide / hydroxyethyl methacrylate composite microspheres is different, and the particle size ranges from hundreds of nanometers to tens of microns. Shape and smooth surface without impurities, good dispersion, no particle aggregation, the co...

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Abstract

The invention discloses a polyacrylamide / microsphere composite gel and a preparation method of the polyacrylamide / microsphere composite gel. The polyacrylamide / microsphere composite gel is formed by crosslinking polyacrylamide and a polymeric microsphere; the polymeric microsphere is an acrylamide / hydroxyethyl methylacrylate composite microsphere; and the mass ratio of the polyacrylamide to the polymeric microsphere is 2:(1-10). As the conventional polymer gel is in a three-dimensional hole network structure, the main ingredient of the conventional polymer gel is water molecule, the chain structure of the gel is loose, and the gel is relatively low in strength, has certain mobility, and cannot reach the required strength of a gel valve in the application of an oil field. Particularly for the high-pressure stratum, the conventional gel cannot effectively prevent the oil gas from overflowing. Aiming at the situation, the organic microsphere is added in the polymer gel to reach the effectof improving the strength, so that the mechanical strength of the gel valve is improved, and the property of the gel valve in a sleeve is improved. The interaction between the organic microsphere andthe polymer is also investigated, and the polyacrylamide / microsphere composite gel has a guiding significance for improving the mechanical property of the gel valve.

Description

technical field [0001] The invention relates to a polyacrylamide composite gel and a preparation method thereof, in particular to a polyacrylamide / microsphere composite gel and a preparation method thereof. Background technique [0002] In order to meet the demand for oil in the world's economic development, the current focus of oil exploration and development has shifted to medium and small oil fields, oil fields with complex geological and surface conditions, unconventional oil and gas resources, and the transformation and potential tapping of oil fields in the middle and later stages. This form increases the difficulty of exploration and development, and increases the input cost. There is an urgent need for new technologies for oil and gas exploration and development. Reducing the cost of oil exploration and development is one of the important tasks in the upstream field of the petroleum industry. As far as my country is concerned, special oil and gas resources are distri...

Claims

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Application Information

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IPC IPC(8): C08L33/26C08J3/24C08J3/075C08F220/56C08F220/20C08F222/38
CPCC08F220/56C08J3/075C08J3/246C08J2333/26C08J2433/26C08F220/20C08F222/385
Inventor 杨子浩张储桥王梦涵宋夏林梅钦董朝霞张娟
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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