Oil field annulus protection fluid and preparation method thereof

Abstract

The invention discloses an oil field annulus protection fluid and a preparation method thereof. The annulus protection fluid comprises, by mass percentage, 2-10% of organic phosphine, 1-8% of a polymer dispersant, 5-15% of a corrosion inhibitor, 2-10% of a sterilizing agent, 1-5% of a solubilizing agent, 10-20% of a buffering agent, 2-10% of a deoxidant and the balance water. The method includes the steps that (1) the raw materials are weighed separately according to the ratio, the solubilizing agent and the buffering agent are mixed and stirred to be uniform, and then the mixture is added todeionized water with the temperature of 35-40 DEG C to obtain a mixture I; (2) the deoxidant, the sterilizing agent, the polymer dispersant, the corrosion inhibitor and the organic phosphine are sequentially added to the mixture I obtained in step (1), and stirring is performed for 1.5-2 hours at a constant temperature to obtain the oil field annulus protection fluid. The invention provides the oil field annulus protection fluid which is excellent in performance and capable of ensuring the long-term safe use of an oil-string casing, and also discloses the preparation method of the oil field annulus protection liquid. The method is simple, low in equipment requirement and suitable for industrial production.

Description

technical field [0001] The invention relates to the development and application of oilfield additives, in particular to an annulus protection fluid used between oil pipes and oil formation casings and a preparation method thereof. Background technique [0002] Annulus protection fluid is a fluid filled between the oil pipe and the casing of the oil layer, which not only reduces the oil and gas pressure on the casing head or packer, but also plays a certain role in sealing to prevent the packer from puncturing; and It reduces the pressure difference between the oil pipe and the annular space, and can inhibit the corrosion, scale inhibition tendency and bacterial growth of the oil pipe and casing, that is, it has corrosion resistance, stability and bactericidal properties. [0003] According to the nature of the fluid continuous phase, the oilfield annular protection fluid can be divided into oil-based annular protection fluid and water-based annular protection fluid, wherein ...

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Problems solved by technology

At present, the annular space protection fluid products on the market have a single function and have defects in their ingredients, and the annular space protection fluid has not been widely promoted due to its own defects.

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