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Temporary plugging agent assisted carbon dioxide huff and puff oil extraction method

A technology of carbon dioxide and temporary plugging agent, applied in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve the problems of poor sealing performance, long plugging validity period, and reduced plugging ability of dominant seepage channels in reservoirs. It is beneficial to the recovery of reservoir permeability, has a wide range of applications, and improves the plugging strength.

Pending Publication Date: 2022-03-01
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The existing granular plugging agent has poor injectability, and because each particle is dispersed, the plugging performance of the dominant seepage channel in the reservoir is poor, and the plugging period is long, which is not conducive to the flow of crude oil after huffing and puffing
[0007] (2) The existing cross-linked polymer gel plugging agent is not resistant to shearing. When subjected to the shearing action of pipelines, pumps, and porous media, the plugging capacity is greatly reduced, and the plugging validity period is also longer
[0008] (3) The existing foam plugging agent has a moderate plugging validity period, but the plugging strength is low

Method used

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  • Temporary plugging agent assisted carbon dioxide huff and puff oil extraction method

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1: the preparation of temporary plugging agent

[0042] In the present invention, 50 g of deionized water and 10 g of acrylic acid are added to a 500 ml round bottom flask, the pH value is adjusted to 7 to 7.5 with sodium hydroxide, and then 16 g of acrylamide, 0.15 g of allyl sodium sulfonate, and 0.03 g of dipropylene glycol diacrylic acid are added. After fully stirring, add a certain amount of deionized water to form a solution with a mass concentration of 30%, and ventilate nitrogen to remove oxygen; add 0.07g ammonium persulfate-sodium bisulfite initiator, stir to dissolve it, and obtain the obtained The temporary blocking agent.

Embodiment 2

[0043] Embodiment 2: Polymerization of temporary plugging agent

[0044] Seal the temporary blocking agent obtained in Example 1 and place it in a thermostat at 60°C, take it out after 24 hours, dry it and pulverize it to obtain the polymerization product of the temporary blocking agent.

Embodiment 3

[0045] Embodiment 3: Characterization of temporary plugging agent polymerization product

[0046] The infrared spectrogram of the temporary plugging agent polymerization product of embodiment 2 gained is as follows figure 2 As shown, the N-H stretching vibration absorption peak is located at 3434cm -1 ; C-H stretching vibration absorption peak in methylene is located at 2927cm -1 ; The C-H antisymmetric stretching vibration absorption peak in the methyl group is located at 2855cm -1 ;C=O stretching vibration absorption peak is located at 1629cm -1 ; The C-H in-plane bending vibration absorption peak in the methyl group is located at 1460cm -1 ; The C-N stretching vibration absorption peak in the primary amide is located at 1407cm -1 ; The C-O stretching vibration absorption peak of the carboxyl group is located at 1325cm -1 ; C-O-C stretching vibration absorption peak in dipropylene glycol diacrylate is located at 1176cm -1 ; Primary amides -NH 2 The in-plane rocking v...

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Abstract

The invention belongs to the technical field of medium and low permeability oil field recovery efficiency improvement, and discloses a temporary plugging agent assisted carbon dioxide huff and puff oil extraction method which comprises the steps of injecting a temporary plugging agent slug, injecting clear water for replacement and waiting for setting. Injecting a carbon dioxide slug, and injecting clear water for replacement; soaking the well; and opening the well for production. According to the temporary plugging agent assisted carbon dioxide huff and puff oil extraction method provided by the invention, a dominant seepage channel in a reservoir can be effectively plugged, and carbon dioxide is prevented from forming gas channeling along the dominant seepage channel, so that the swept volume of the carbon dioxide can be enlarged, and the carbon dioxide can enter a remaining oil enriched area and play a role; in the well opening production process, the temporary plugging agent can be degraded under the reservoir condition, so that permanent damage to the reservoir is avoided, the plugging strength is greatly improved, and flowing of crude oil after huff and puff is facilitated. In addition, the temporary plugging agent assisted carbon dioxide huff and puff oil extraction method provided by the invention also has the characteristics of simple process, wide application range and the like.

Description

technical field [0001] The invention belongs to the technical field of enhanced oil recovery in medium and low permeability oil fields, and in particular relates to a temporary plugging agent-assisted carbon dioxide huff and puff oil recovery method. Background technique [0002] At present, my country's medium and low permeability oilfields are rich in reserves. At present, the middle and low permeability blocks that can establish a reasonable injection-production relationship are mainly developed by water injection, while a large number of medium and low permeability blocks that are difficult to establish a reasonable injection-production relationship lack effective development methods. Carbon dioxide huff and puff can supplement formation energy, reduce oil-water interfacial tension, reduce crude oil viscosity, and improve mobility ratio, thereby improving reservoir development effects, and has potential application in the development of medium and low permeability oilfiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/138E21B43/16C09K8/508
CPCE21B33/138E21B43/164C09K8/5083
Inventor 覃孝平李翠霞杨悦
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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