AM-DAAM-AMPS ternary polymer gel particle drive-adjusting reagent and synthesis method thereof

A technology of ternary polymers and gel particles, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of pre-crosslinked particle plugging agent difficult deep profile control, etc., to achieve enhanced molecular rigidity, good Profile control and water shutoff ability, increase the effect of temperature resistance and salt resistance

Inactive Publication Date: 2015-01-14
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing pre-crosslinked particle plugging control agent is difficult to apply to deep profile control of high temperature and high salinity reservoirs

Method used

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  • AM-DAAM-AMPS ternary polymer gel particle drive-adjusting reagent and synthesis method thereof
  • AM-DAAM-AMPS ternary polymer gel particle drive-adjusting reagent and synthesis method thereof
  • AM-DAAM-AMPS ternary polymer gel particle drive-adjusting reagent and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Synthesis of Ternary Polymerized Gel Particles AM-DAAM-AMPS

[0013] Weigh 14g AM, 2g DAAM, and 4g AMPS respectively into jars, and take a certain amount of pure water to prepare an aqueous solution with a concentration of 20% of the total monomer mass. Titrate with NaOH solution to pH 7, then add initiator ammonium persulfate solution and sodium bisulfite solution (molar ratio is 1:1), the amount of initiator added is 0.4% of the total mass of monomer; add crosslinking agent MBA , the cross-linking agent addition is 0.07% of the total mass of monomers. The jar was put into a water bath at 50°C for 3 hours to react, and finally washed with absolute ethanol, pulverized, and dried to obtain AM-DAAM-AMPS ternary polymer gel particles.

Embodiment 2

[0014] Example 2: Characterization of AM-DAAM-AMPS terpolymer gel particle structure

[0015] The infrared spectrogram of the terpolymer AM-DAAM-AMPS synthesized by embodiment 1 is as follows figure 1 shown; From the figure, we can see that the stretching vibration peak of C-S is located at 629cm -1 ; The characteristic absorption peak of the sulfonic acid group is located at 1041cm -1 、1208cm -1 ; The methyl absorption peak is located at 2925cm -1 、1350cm -1 and 1425cm -1 , and at 1350cm -1 and 1425cm -1 A bifurcation occurs at the place, and it can be identified that there are two gem-dimethyl groups with different chemical environments, that is, DAAM and AMPS; 1642cm -1 Be the C=O absorption peak in AM; 1662cm -1 Be the C=O absorption peak of DAAM; 3220cm -1 It is the absorption peak of -NH, 3422cm -1 for-NH 2 the absorption peak.

Embodiment 3

[0016] Example 3: Investigation on temperature resistance of AM-DAAM-AMPS terpolymer gelling agent particles

[0017] The gel particles synthesized in Example 1 were soaked and aged in 8000 mg / L formation water for 30 days at 40°C, 50°C, 60°C, 70°C, and 80°C to measure their water absorption and gel strength. figure 2 It can be seen that the pre-crosslinked particles aged in standard saline at 80°C for 30 days have a water absorption multiple of 40, a gel strength of 0.14 MPa, good toughness, and good temperature resistance (the determination method of strength and toughness: after absorbing water The sample of the profile control agent, after being filtered by a sieve, deformed without breaking when squeezed hard, and returned to its original shape after being loosened, indicating that the profile control agent has good toughness. The laboratory made a set of evaluation gel strength The device, pour the gel particles to be tested into the intermediate container, turn on the ...

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Abstract

The invention relates to an AM-DAAM-AMPS ternary polymer gel particle drive-adjusting reagent and a synthesis method thereof. According to the technical scheme, the polymer drive-adjusting reagent takes acrylamide (AM), diacetone-acrylamide (DAAM), 2-acrylamide-2-methyl-2-propene-1-sulfonic acid (AMPS) as monomers, and the optimal added amount for synthesis is as follows: concentration of the monomers is 20% (percent accounting for the total mass of reactants), and monomer ratio of AM to DAAM to AMPS is 7:1:2 (mass ratio); the added amount of a crosslinking agent is 0.07% (percent accounting for the total mass of the monomers); and the added amount of an initiating agent is 0.4% (percent accounting for the total mass of the monomers). The synthesis method of the AM-DAAM-AMPS ternary polymer gel particle drive-adjusting reagent comprises the following steps: weighing monomers AM, DAAM and AMPS according to the optimal added amounts, putting the monomers into a wide-mouth bottle, adding a certain amount of purified water to prepare a solution, titrating with a NaOH solution until pH value is 7, then adding an initiating agent and a crosslinking agent, and reacting in a water bath at the temperature of 50 DEG C for 3 hours; and finally washing with absolute ethyl alcohol, smashing, and drying, so that AM-DAAM-AMPS ternary polymer gel particles are obtained. The AM-DAAM-AMPS ternary polymer gel particles have good heat resistance, salt tolerance and plugging property and can be applied to oilfield flooding development as a drive-adjusting reagent.

Description

technical field [0001] The invention relates to the technical field of oil field enhanced oil recovery, in particular to an AM-DAAM-AMPS ternary polymer gel particle plugging regulator and a synthesis method thereof. Background technique [0002] With the development of tertiary oil recovery, the understanding of thick oil layers has increased, and the research on the deep treatment of oil layers using chemical reagents has become more and more in-depth. Among them, various underground gelling systems based on polyacrylamide are the most widely used. However, its own shortcomings limit its wide application, mainly due to the severe gelation conditions, weak plugging degree, inapplicability to large pores and fractured reservoirs, poor temperature resistance and salt resistance, etc., which lead to underground gelation. The situation has become more complicated, and some cross-linked systems have even failed to form gels; at the same time, most of the blocks that need to be a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508C08F220/56C08F220/58
CPCC08F220/56C08F220/585C09K8/512C08F220/58
Inventor 赖南君黄攀叶仲斌王洪江吴涛刘凡
Owner SOUTHWEST PETROLEUM UNIV
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