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Annulus protection liquid suitable for flue gas drive injection well and preparation method thereof

A technology for annular protection fluid injection into wells, applied in chemical instruments and methods, earthwork drilling and production, boreholes/well components, etc., can solve the problems of no annular protection fluid suitable for flue gas drive injection wells, and achieve The effect of prolonging the safe service life, sealing performance and mechanical strength is small, and easy to use

Inactive Publication Date: 2020-09-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide an annulus protection fluid suitable for flue gas drive injection wells and its preparation method to solve the technical problem in the prior art that there is no annulus protection fluid suitable for flue gas drive injection wells

Method used

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Examples

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Effect test

preparation example Construction

[0024] According to a typical embodiment of the present invention, a method for preparing the above-mentioned annulus protection fluid suitable for flue gas drive injection wells is provided. The preparation method comprises the following steps: S1, sequentially adding a density regulator, a corrosion and scale inhibitor and an oxygen scavenger into the water and stirring until dissolved; S2, then sequentially adding a bactericide, a pickling gas absorbent and a corrosion inhibitor, and mixing evenly The annulus protection fluid suitable for flue gas drive injection wells can be obtained. It can be seen that the preparation process of the annulus protection fluid suitable for flue gas drive injection wells of the present invention is simple, easy to operate, low in production cost, and convenient for large-scale popularization and use.

[0025] Typically, both S1 and S2 are carried out at normal temperature and pressure; preferably, stirring is carried out in a reactor, and de...

Embodiment 1

[0030] An annulus protection fluid suitable for flue gas drive injection wells, consisting of the following substances by weight percentage:

[0031] 1) Corrosion inhibitor: 1.0% oleic acid imidazoline quaternary ammonium salt, 0.5% propynyl alcohol; (the sum of the two items is 1.5%)

[0032] 2) Oxygen scavenger: 0.1% anhydrous sodium sulfite;

[0033] 3) Fungicide: 0.1% didodecyldimethylammonium bromide;

[0034] 4) Corrosion and scale inhibitor: 0.5% sodium ethylenediamine tetramethylene phosphonate;

[0035] 5) Gas absorbent: 0.5% N-methyldiethanolamine;

[0036] 6) The rest is water.

[0037] In this embodiment, the preparation method of the annulus protection fluid for the flue gas drive injection well is as follows:

[0038] 1) Under normal temperature and pressure, add a certain amount of water into the reaction kettle, start stirring, add sodium formate, sodium ethylenediamine tetramethylene phosphonate, and anhydrous sodium sulfite in sequence, and stir until com...

Embodiment 2

[0042] An annulus protection fluid suitable for flue gas drive injection wells, consisting of the following substances by weight percentage:

[0043] 1) Corrosion inhibitor: 2.0% oleic acid imidazoline quaternary ammonium salt, 1.0% propynyl alcohol;

[0044] 2) Oxygen scavenger: 0.5% anhydrous sodium sulfite;

[0045] 3) Fungicide: 0.5% didodecyldimethylammonium bromide;

[0046] 4) Corrosion and scale inhibitor: 1.0% sodium ethylenediamine tetramethylene phosphonate;

[0047] 5) Gas absorbent: 2.0% N-methyldiethanolamine;

[0048] 6) Density regulator: 15% sodium formate;

[0049] 7) The rest is water.

[0050] In this example, the preparation method of the annulus protection fluid for the flue gas flooding injection well is the same as that in Example 1.

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Abstract

The invention discloses an annulus protection liquid suitable for a flue gas drive injection well and a preparation method thereof. The annulus protection liquid comprises, by mass, 1.5 to 3.0 percentof a corrosion inhibitor, 0.1 to 0.5 percent of a deoxidant, 0.1 to 0.5 percent of a bactericide, 0.5 to 1.0 percent of a corrosion and scale inhibitor, 0.5 to 2.0 percent of a pickling gas absorbent, and 0 to 15 percent of a density regulator, with the balance being water. The annulus protection liquid is a water-soluble annulus protection liquid and is convenient to use, and the annulus protection liquid is directly injected into an annulus when the annulus protection liquid is used. The influence on the sealing performance and the mechanical strength of a packer rubber sleeve is small, therequirement of flue gas injection well oil sleeve protection can be met, corrosion of flue gas to an oil pipe can be inhibited, and the safety service lifetime of a flue gas drive injection well is prolonged.

Description

technical field [0001] The invention relates to the technical field of oil and gas well corrosion protection, in particular to an annulus protection fluid suitable for flue gas drive injection wells and a preparation method thereof. Background technique [0002] With the development of gas flooding enhanced oil recovery technology and the rise of natural gas prices, the R&D and application of flue gas flooding enhanced oil recovery technology have been vigorously carried out at home and abroad in recent years. Especially in recent years, greenhouse gas emission reduction has become a national After major problems at the oil and gas level, flue gas injection flooding has received unprecedented attention. Flue gas contains 80% to 85% N 2 and 10% to 15% CO 2 Gas. Injected flue gas not only has the same CO 2 Similar oil displacement characteristics, also has N 2 The advantages of oil displacement are of great significance in terms of increasing oil recovery and reducing envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54
CPCC09K8/54
Inventor 熊启勇石善志于会永易勇刚何小东郭长永王雅静田刚陈禹欣
Owner PETROCHINA CO LTD
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