Annular protecting liquid for oil and gas well

An annulus protection fluid and well annulus technology, applied in wellbore/well parts, earthwork drilling and production, etc., can solve the problems of inability to maintain long-term stability and poor high temperature stability, and achieve high temperature resistance and thermal stability Good, low formation damage rate effect

Active Publication Date: 2012-10-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an annulus suitable for high-sulfur oil and gas wells with simple preparation process, convenient on-site maintenance and reasonable cost in view of the defects of poor high temperature stability and inability to maintain long-term stability in the above-mentioned prior art. Protective fluid system

Method used

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  • Annular protecting liquid for oil and gas well

Examples

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Effect test

Embodiment 1

[0019] Embodiment 1: the present invention comprises density regulator, corrosion inhibitor, antibacterial agent, oxygen scavenger, desulfurizer, water, wherein: density regulator is KCOOH, consumption is 20.0%; Corrosion inhibitor is CT2-12, The dosage is 5.0%; the antibacterial agent is dodecyltrimethylammonium chloride, the dosage is 1.5%; the oxygen scavenger is sodium erythorbate, the dosage is 4.1%; the balance is water.

Embodiment 2

[0020] Embodiment 2: Density regulator is NaCOOH, and consumption is 20.0%; Corrosion inhibitor is CT2-12, and consumption is 5.0%; Antibacterial agent is dodecyl dimethyl tertiary amine, and consumption is 1.5%; Oxygen scavenger It is sodium ascorbate, the dosage is 4.1%; the desulfurizer is basic zinc carbonate, the dosage is 1.0%; the balance is water.

Embodiment 3

[0021] Example 3: The density regulator is a compound of KCOOH and NaCOOH, the dosage of KCOOH is 20.0%, and the dosage of NaCOOH is 13.0%; the corrosion inhibitor is CT2-12, and the dosage is 4.0%; the antibacterial agent is dodecyl trimethyl Ammonium chloride, the dosage is 1.5%; the oxygen scavenger is sodium erythorbate, the dosage is 2.0%; the sulfur removal agent is the iron complex compound, the dosage is 1.5%; the balance is water.

[0022] Other embodiments are identical with above-mentioned embodiment preparation method, and concrete formula is as shown in table 1:

[0023] Table 1 is the embodiment of the present invention

[0024] components Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 KCOOH 20.0 0 20.0 0 0 10.0 0 20.0 20.0 20.0 33.0 33.0 NaCOOH 0 20.0 13.0 0 0 0 10.0 0 0 0 0 0 CT2-12 5.0 5.0 4.0 3.0 3.0 3.0 3...

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Abstract

The invention relates to an annular protecting liquid for oil and gas wells and belongs to the chemical technology field. In the liquid, a solution of organic acid salts is used as a density modifier, an imidazoline quaternary ammonium salt is used as a corrosion inhibitor, a quaternary ammonium salt cationic surfactant is used as a bacteriostatic agent and an isoascorbic acid alkali metal salt or an optical isomer thereof is used as a deoxidant. And an iron-centric coordination compound with two-valence ion or basic zinc carbonate can be added as a Desulphurizing Reagent, according to the sulfur-containing situation of a casing annulus. With a corrosion rate to N80 steel discs of 0.070mm/a and a corrosion rate to TP110SS steel discs of 0.0105mm/a, the annular protecting liquid, which is capable of prolonging the service life of an annular tubular column of a shaft by over 50% and decreasing the safety accidents resulted from corrosion perforation by over 30%, satisfies the requirements of annular protecting liquid for wells with different depths, has the characteristics of low stratum damage rate and no pollution and is applicable to the annular protection of oil and gas wells with high content of sulfur or other oil and gas wells.

Description

Technical field [0001] The present invention involves a kind of oil -gas shaft circular protection liquid, which is the field of chemical technology in the oil field. Especially after the construction of a sulfur -containing oil and gas well, it has corrosion and protection of the tube tube circular space. Background technique [0002] Circle protection liquid can be divided into water -based circular protection liquid and oil -based circular protection liquid according to its continuous phase.Because of its simple construction, convenience, and low cost, the water -based cycle protection solution is more commonly used after finishing the well, but it is generally corrosive, and the system itself has certain limitations.The oil -based cyclone protection solution is non -corrosive, and the heat stability of the water base is good. Due to problems such as high cost and serious environmental pollution, it is difficult to promote application widely.The "Drilling Liquid and Wells" edi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54
Inventor 孙清德党丽旻刘亚勇林伟民赵斌刘晶王肯堂乔欣李同峰
Owner CHINA PETROLEUM & CHEM CORP
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