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Carbon dioxide drive injection well annular protective liquid and preparation method and use method thereof

An annular protective fluid and carbon dioxide technology, which is applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc. Reduce casing damage, facilitate large-scale application, and facilitate on-site maintenance

Active Publication Date: 2018-07-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these above-mentioned prior art all have not considered low temperature and CO 2 The effect of dissolving in water on the pipe and annular protection fluid cannot meet the requirements of CO 2 Injection well oil casing protection requirements

Method used

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  • Carbon dioxide drive injection well annular protective liquid and preparation method and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A carbon dioxide flooding injection well annulus protection fluid is composed of the following substances by weight percentage:

[0047] 2% modified imidazoline derivatives;

[0048] 1% alkylphenol polyoxyethylene ether phosphate;

[0049] 5% hexamethylenetetramine;

[0050] 3% diethylenetriaminepentamethylene phosphoric acid;

[0051] 89% diesel.

[0052] Wherein, the modified imidazoline derivative is imidazoline phosphate.

[0053] In this example, the preparation method of the annulus protection fluid for carbon dioxide flooding injection wells is as follows:

[0054] 1) Under normal temperature and pressure, first stir the modified imidazoline derivative and alkylphenol polyoxyethylene ether phosphate with diesel oil in the reactor until completely dissolved;

[0055] 2) Under continuous stirring, add hexamethylenetetramine and diethylenetriamine pentamethylene phosphoric acid to the step-by-step reactor, stir while adding, and mix well to obtain the product. ...

Embodiment 2

[0065] A carbon dioxide flooding injection well annulus protection fluid is composed of the following substances by weight percentage:

[0066] 1% modified imidazoline derivatives;

[0067] 3% Alkylphenol Ethoxylate Phosphate;

[0068] 2% hexamethylenetetramine;

[0069] 1% diethylenetriaminepentamethylene phosphoric acid;

[0070] 93% diesel.

[0071] Wherein, the modified imidazoline derivative is mercaptobenzothiazole imidazoline.

[0072] In this example, the preparation method of the annulus protection fluid of the carbon dioxide flooding injection well is the same as that in Example 1.

[0073] In this example, the performance test of the annulus protection fluid of the carbon dioxide flooding injection well was carried out using the method and conditions in Example 1, and the test results showed that:

[0074] In the experiment, CO 2 The partial pressure is 10MPa, the experiment time is 14d, and the injected water is 10%. The experimental results show that when t...

Embodiment 3

[0077] A carbon dioxide flooding injection well annulus protection fluid is composed of the following substances by weight percentage:

[0078] 0.5% modified imidazoline derivatives;

[0079] 5% alkylphenol ethoxylate phosphate;

[0080] 3% hexamethylenetetramine;

[0081] 2% diethylenetriaminepentamethylene phosphoric acid;

[0082] 89.5% diesel.

[0083] Wherein, the modified imidazoline derivative is thioureidoimidazoline benzoate.

[0084] In this example, the preparation method of the annulus protection fluid of the carbon dioxide flooding injection well is the same as that in Example 1.

[0085] In this example, the performance test of the annulus protection fluid of the carbon dioxide flooding injection well was carried out using the method and conditions in Example 1, and the test results showed that:

[0086] In the experiment, CO 2 The partial pressure is 10MPa, the experiment time is 14d, and the injected water is 10%. The experimental results show that when ...

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Abstract

The invention provides carbon dioxide drive injection well annular protective liquid and a preparation method and a use method thereof, and belongs to the technical field of oil exploration. The protective liquid is prepared from the following substances in mass percent: 2.5-7% of sustained release agent, 1-5% of surfactant; 1-3% of anti-slugging agent, and the balance of diesel oil. The total cost of the carbon dioxide drive injection well annular protective liquid is effectively reduced by adopting a massive dose of diesel oil as the solvent, so that the cost is reasonable and acceptable, and the carbon dioxide drive injection well annular protective liquid is easy to popularize and apply in large scale. The protective liquid is good in low-temperature stability, and capable of effectively reducing CO2 injection well tubular column corrosion rate.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a carbon dioxide flooding injection well annulus protection fluid and a preparation method and application method thereof. Background technique [0002] In the process of oil and gas field development, in order to reduce the pressure difference between the tubing and the casing annulus and prevent corrosion of the tubing and casing, it is necessary to inject protective fluid into the casing annulus. Annulus protection fluid can be divided into water-based annulus protection fluid and oil-based annulus protection fluid according to the nature of its continuous phase. Water-based annulus protection fluids are easy to construct and low in cost, but corrosion problems are common; oil-based annulus protection fluids are non-corrosive, but are usually limited by their high unit cost and cannot be widely used. [0003] The invention application with the appli...

Claims

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Application Information

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IPC IPC(8): C09K8/54
CPCC09K8/54C09K2208/32C23F11/149
Inventor 何淼何治武周佩姜毅刘宁董俊唐泽玮邱筱琳
Owner PETROCHINA CO LTD
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