High-acidity gas well oil-based annulus protection fluid

An annular protective fluid and acid gas technology, applied in wellbore/well components, drilling composition, earth-moving drilling, etc. Corrosion damage, lower oil and gas production costs, formulation cost savings

Active Publication Date: 2016-01-13
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 aim at the low corrosion resistance to carbon steel pipes in the above-mentioned water-based annulus protection fluid and oil-based annulus protection fluid, which are not suitable for high acid gas environments, and the oil-water stratification in the p

Method used

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  • High-acidity gas well oil-based annulus protection fluid
  • High-acidity gas well oil-based annulus protection fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0013] In terms of mass percentage, the liquid is formulated according to the component formula: the corrosion inhibitors are ethylenediamine and ethyl orthosilicate, the dosages are respectively 0.5% and 0.5%; the dosage of dithiocyanomethane is 0.5%; the balance is 7#white Oil, stir evenly to obtain oil-based annulus protection liquid.

Embodiment 2

[0014] Example 2: Calculated by mass percentage, formulating liquid according to component formula: corrosion inhibitors are ethylenediamine and ethyl acetate, the dosages are 0.5% and 0.5% respectively; the dosage of dithiocyanomethane is 0.5%; the balance is 7# white oil, stir evenly to obtain oil-based annulus protection liquid.

[0015] Other examples are the same as the above examples, and the specific formulations are shown in Table 1:

[0016] Table 1 Formulation ingredient list of inventive examples 3-10

[0017]

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Abstract

The invention relates to a high-acidity gas well oil-based annulus protection fluid and belongs to the field of oil field chemical technology. The high-acidity gas well oil-based annulus protection fluid is composed of following components, by mass, 1.0-1.5% of a corrosion inhibitor, 0.5-1.5% of dithiocyanomethane and the balanced being white oil. The annulus protection fluid has good thermal stability and strong anti-high-temperature performance. Under an environment with total pressure being 7 MPa, H2S partial pressure being 1 MPa and CO2 partial pressure being 1 MPa, the annulus protection fluid is not more than 0.0018 mm/a in corrosion rate on A3 steel sheets and is not more than 0.0047 mm/a in corrosion rate on N80 steel sheets, is not more than 3/ml in sterilization effects on saprophytic bacteria, iron bacteria and sulfate reducting bacteria. The annulus protection fluid can effectively prevent corrosion and destroy on oil pipelines in the well environment, can provide a durable protective function and greatly prolongs service life of annulus tubular column in the well. An oil phase is formed by the industrial-grade white oil so that the annulus protection fluid has low damage on human body and environment.

Description

Technical field [0001] The invention relates to an oil-based annulus protection fluid suitable for high-acid oil and gas wells, belonging to the technical field of oil field chemistry, in particular to a completion fluid system for corrosion protection of the annular space of oil and casing pipes in the production process of high-acid oil and gas wells. Background technique [0002] As an important technology for protecting oil and casing of highly acidic gas wells, annulus protection fluid has been widely used at home and abroad in recent years. Commonly used annulus protective liquids can be divided into water-based annulus protective liquids and emulsion annulus protective liquids according to the nature of their continuous phase, while oil-based annulus protective liquids are less used in the field due to their high price. Water-based annulus protection fluid is more commonly used after completion of wells due to its low cost and low damage to the reservoir. However, when use...

Claims

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Application Information

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IPC IPC(8): C09K8/54
CPCC09K8/54C09K2208/32
Inventor 刘晶刘亚勇乔欣张庆生曾浩石岩王平强彦龙
Owner CHINA PETROLEUM & CHEM CORP
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