Responsive interpenetrating network gel particles for preventing CO2 gas channeling of compact oil reservoirs and preparation method thereof

A technology of gel particles and interpenetrating networks, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of matrix start-up difficulties, excessive permeability differences, etc., and achieve good response reversibility and increased regulation Intensity, the effect of increasing intensity

Active Publication Date: 2020-08-18
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when regulating tight oil reservoirs, conventional pre-crosslinked gel particles regulate fractures by bridging, trapping, accumulating, and elastically sealing. After the regulation, the difference in permeability between the fracture and the matrix is ​​still too large. CO 2 Matrix priming remains difficult during flooding

Method used

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  • Responsive interpenetrating network gel particles for preventing CO2 gas channeling of compact oil reservoirs and preparation method thereof
  • Responsive interpenetrating network gel particles for preventing CO2 gas channeling of compact oil reservoirs and preparation method thereof
  • Responsive interpenetrating network gel particles for preventing CO2 gas channeling of compact oil reservoirs and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Dissolve 48g of acrylamide, 6g of methacryloyl chloride-modified alkylphenol polyoxyethylene ether and 0.2g of N,N-methylenebisacrylamide into 150mL of distilled water using ultrasound;

[0037] (2) Slowly add 0.01 g of ammonium persulfate into the system, blow N2 for 30 minutes to remove oxygen in the system, raise the temperature to 50°C, and react for 4 hours to obtain a pre-crosslinked gel.

[0038] (3) The obtained gel is granulated, dried at 70° C., and then pulverized to obtain pre-crosslinked gel particles (ASSAP).

[0039] (4) Add the pre-cross-linked gel particles obtained in step (3) to the solution of 10g dimethylaminoethyl methacrylate, 0.03g 4,4'-azobis(4-cyanopentyl) under stirring condition acid) and 0.2g of N,N-methylenebisacrylamide in 100ml of deionized aqueous solution, let the mixture absorb water to swell for 24 hours, then raise the temperature to 70°C again, and react for 4 hours to obtain it.

[0040] (5) The obtained gel is granulated, dri...

Embodiment 2

[0044] Preparation of CO 2 The method of the responsive interpenetrating network gel particle is the same as that of Example 1, the only change is that in step (2), 0.1 g of ammonium persulfate is changed to 0.08 g of azobisisobutylamidine hydrochloride.

Embodiment 3

[0046]Preparation of CO 2 The method of the responsive interpenetrating network gel particle is the same as that in Example 1, the only change is that in step (4), dimethylaminoethyl methacrylate is replaced with dimethylaminopropyl methacrylamide.

[0047] (2) Performance test:

[0048] 1. CO 2 Responsive performance testing

[0049] In order to test the CO of the present invention 2 Responsive interpenetrating network gel particles for CO 2 Responsiveness, take the CO in Example 1 2 Responsive interpenetrating network gel particles, using a laser particle size analyzer to measure CO influx into gel particles 2 The size distribution before and after is measured, and the specific test results are as follows figure 1 shown.

[0050] from figure 1 It can be seen that the CO 2 Before, the size distribution of the gel particles was 0.6 μm to 55 μm, and the median particle size was 18.24 μm; CO was introduced at a rate of 10ml / min 2 After 30 minutes, the size distribution...

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Abstract

The invention discloses a responsive interpenetrating network gel particle for preventing CO2 gas channeling of compact oil reservoirs and preparation method thereof. The gel particle is prepared from, in percentage by mass, 15 to 25 percent of acrylamide monomer, 0 to 5 percent of temperature-resistant and salt-resistant monomer, 3 to 6 percent of a CO2 responsive monomer; and a cross-linking agent, an initiator I, an initiator II and water. Gel particles are prepared from acrylamide and a temperature-resistant and salt-resistant monomer, and the prepared gel particles, a CO2 response monomerand the gel particles are dissolved in water and react for a period of time to obtain the temperature-resistant and salt-resistant hydrogel. According to the invention, the cross-linking density of the particles in unit volume is increased by the interpenetrating network structure, so that the strength of the particles is increased; after the CO2 responsive interpenetrating polymer network gel particle is in contact with CO2, the particle size is increased, and CO2 responsiveness is shown, so that the regulation and control strength in the CO2 displacement process is improved; meanwhile, whenthe CO2 responsive interpenetrating polymer network gel particle is not in contact with CO2, the particle size is reduced, and good reversibility is shown.

Description

technical field [0001] The invention relates to the technical field of drilling and production, in particular to a method for preventing CO in tight oil reservoirs. 2 Bleeding CO 2 Responsive interpenetrating network gel particle and its preparation method. Background technique [0002] Tight oil reservoirs are characterized by low permeability, complex pore structure, and high start-up pressure. The main development method is horizontal well volume fracturing. The remaining oil is high, so further enhanced recovery is needed. After the depletion development of conventional reservoirs, water injection is usually used to enhance recovery, but tight reservoirs are highly water-sensitive, and it is difficult for injected water to enter the matrix. while CO 2 Due to the lower miscibility pressure and higher recovery after miscibility, flooding has gradually become a research hotspot in the development of tight oil reservoirs. However, after volume fracturing, the reservoir ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/34C08F220/60C08F220/56C08F222/38C08F220/28C09K8/512
CPCC08F290/062C08F220/34C08F220/60C08F220/56C09K8/512C08F222/385
Inventor 杜代军蒲万芬陈博文樊桓材刘锐
Owner SOUTHWEST PETROLEUM UNIV
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