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Method for long-acting protection of reservoir and improvement of permeability of reservoir

A polyether, alkyl imidazole technology, applied in chemical instruments and methods, drilling compositions, organic chemistry, etc., can solve problems such as poor anti-swelling effect and anti-scouring effect, and achieve excellent washing resistance and long-term performance. Effective performance, good anti-swelling effect, and the effect of improving sand carrying capacity

Active Publication Date: 2021-12-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a class of polyether-bridged alkylimidazolium salts and a preparation method thereof; this type of compound can be used as an additive for stabilizing clay minerals, solving the problems of poor anti-swelling and erosion-resistant effects of existing clay stabilizers, and achieving The effect of long-term protection of the reservoir; at the same time, this type of compound can also be used as an additive to increase the permeability of the reservoir, improve the oil-water relative permeability ratio and gas-water relative permeability ratio, and then improve oil and gas recovery; this type of compound Benefits in one dose

Method used

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  • Method for long-acting protection of reservoir and improvement of permeability of reservoir
  • Method for long-acting protection of reservoir and improvement of permeability of reservoir
  • Method for long-acting protection of reservoir and improvement of permeability of reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1 Preparation of a polyether bridged alkyl imidazolium salt

[0037] The polyether-bridged alkylimidazolium salts of the present invention have the following properties: figure 1 shown. figure 1 Among them, n is an integer from 0 to 17, m is a positive integer from 1 to 99, X is one of Cl and Br, and R is H or CH 3 One of them, R' is H, CH 3One of.

[0038] In this embodiment, select n to be 11, m to be 3, X to be Cl, R to be CH 3 , R' is CH 3 Take the corresponding compound as an example, the code name is PO4-DImC12, its chemical structure is shown in formula (5), and its synthesis method and characterization are introduced in detail.

[0039]

[0040] The reaction process of the compound PO4-DImC12 involved in this embodiment is as follows figure 2 As shown, the specific preparation method is as follows.

[0041] Preparation of PO4-Cl

[0042] The PO4-Cl preparation method of the present embodiment comprises the following steps:

[0043] (1) We...

Embodiment 2

[0064] The structural characterization of a kind of polyether bridged alkyl imidazolium salt of embodiment 2

[0065] The IR characterization of the polypropylene glycol-bridged alkylimidazolium salt representative PO4-DImC12 prepared in Example 1 was carried out.

[0066] IR Characterization of PO4-DImC12

[0067] IR characterization was performed on the PO4-DImC12 prepared in the above examples. Select the sample prepared in Example 1, adopt the KBr tablet method, and use the WQF-510A Fourier Transform Infrared Spectrometer to characterize the PO4-DImC12 structure, and the IR spectrum is as follows image 3 shown.

[0068] From image 3 As can be seen in the 3539cm -1 Indicates that the sample absorbed a certain amount of moisture in the air during the sample preparation process, 3132cm -1 and 3062cm -1 C—H stretching vibration on the imidazole ring, 2924cm -1 and 2856cm -1 for—CH 2 —and—CH 3 The C—H stretching vibration, 1639 and 1562cm -1 is the stretching vibra...

Embodiment 3

[0069] Example 3 Anti-expansion performance test of a polyether bridged alkyl imidazolium salt

[0070] The PO4-DImC12 prepared in the above-mentioned Example 1 was tested for anti-expansion performance. Select the sample prepared in Example 1, and refer to the petroleum industry standard "SYT 5971-2016 Oil and Gas Field Fracturing Acidification and Water Injection Clay Stabilizer Performance Evaluation Method" to evaluate the anti-swelling performance of the sample. The specific operations are as follows:

[0071] (1) Prepare 0.45mol / L KCl solution and 0.45mol / L NH solution respectively 4 Cl solution, 0.10mol / L PO4-DImC12 solution as clay stabilizer solution.

[0072] (2) Weigh 0.50g of sodium bentonite, accurate to 0.01g, put it into a 10mL centrifuge tube, add 10mL of clay stabilizer solution, shake well, place it at room temperature for 2h, put it into a centrifuge, and put it in a centrifuge at a speed of 1500r / Centrifuge for 15 minutes at 1 min, read the volume V of t...

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Abstract

The invention discloses a method for long-acting protection of a reservoir and improvement of permeability of the reservoir. The method comprises the following steps: firstly, preparing dihalogenated polyether from polyether glycol and a halogenating agent, then preparing long-chain alkyl imidazole from halogenated alkane and imidazole, and finally, carrying out quaternization reaction on the dihalogenated polyether and the long-chain alkyl imidazole to prepare the novel polyether-bridged alkyl imidazolium salt. The polyether-bridged alkyl imidazolium salt prepared by the invention can be used as an additive for long-acting protection of the reservoir and improvement of the permeability of the reservoir.

Description

technical field [0001] The invention relates to the technical field of oil field reservoir protection and enhanced recovery, in particular to a method for long-term protection of reservoirs and improvement of reservoir permeability. Background technique [0002] Water sensitivity of oil and gas reservoirs has been a major concern due to swelling and migration of clay minerals. As the understanding of oil and gas reservoirs has developed, experts have developed many clay stabilizers. Himes et al pointed out that the clay stabilizer should contain the appropriate cationic charge, appropriate molecular weight and characteristics that do not change the wettability of the reservoir. Currently, the most commonly used clay stabilizers are inorganic and organic chloride salts, including KCl, NH 4 Cl, tetramethylammonium chloride (TMAC) and choline chloride, these products are cheap and abundant, effective in most oil and gas reservoirs, and have been used for many years. However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58C09K8/588C09K8/68C09K8/72C09K8/74C09K8/88C07D233/60
CPCC09K8/58C09K8/588C09K8/72C09K8/725C09K8/74C09K8/68C09K8/885C07D233/60C09K2208/12
Inventor 周利华武元鹏何杨苟绍华王犁李振宇向东赵春霞李辉王斌
Owner SOUTHWEST PETROLEUM UNIV
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