Modifying agent for preventing calcium halide scaling

A modifier, the technology of aminotrimethylene phosphonic acid, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of clogging, aggravated corrosion, stratum scaling, etc., and achieve low consumption and strong flowback ability , Improve the effect of flowback performance

Active Publication Date: 2016-03-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects existing in the prior art, the present invention provides a modifier for preventing calcium halide scaling, which uses the effects of various chemical components to prevent calcium halide well killing fluid from scaling, and solves the problem that calcium halide is currently used as a well killing agent. Problems such as stratum scaling, clogging and aggravated corrosion occurred during the application of liquid

Method used

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Examples

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Embodiment 1

[0027] This embodiment provides a modifier for preventing calcium halide fouling. Its formula consists of: 15-25 parts of aminotrimethylene phosphonic acid, 4-8 parts of dioctyl sodium sulfosuccinate, cetyl tris 2-3 parts of methyl ammonium chloride, 0.1-0.3 parts of tributyl phosphate, and the rest is water (distilled water).

[0028] For example, in terms of parts by mass, 20 parts of aminotrimethylene phosphonic acid, 5 parts of dioctyl sodium sulfosuccinate, 2 parts of cetyltrimethylammonium chloride, 0.2 parts of tributyl phosphate, and 72.8 parts of distilled water Prepare 5kg of the modifying agent for preventing calcium halide scaling. During application, the modifier for preventing calcium-halide scaling is mixed into the calcium-halogen workover fluid at a ratio of 2%, and injected into the well with a cement truck along with the workover fluid. The interfacial tension is 5.82mN / m, the anti-swelling rate is 96%, and the scale-inhibiting rate is 97.1%.

[0029] For ...

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Abstract

The invention discloses a modifying agent for preventing calcium halide scaling. The modifying agent is prepared from, by mass, 15-25 parts of amino trimethylene phosphonic acid, 4-8 parts of docusate sodium, 2-3 parts of cetyltrimethylammonium chloride, 0.1-0.3 part of tributyl phosphate and the balance water. The modifying agent has the advantages of being high in scaling resistance, small in use amount, easy to construct, not capable of increasing operation workloads, high in flow-back capacity, capable of saving cost, and the like.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a modifier for preventing calcium halide scaling. Background technique [0002] In the process of oilfield development, workover operation is an important means to maintain the productivity of production wells and slow down the natural decline. Killing fluid is needed to balance the formation pressure during its operation, and calcium halide has a certain application proportion as killing fluid. [0003] The application of calcium halide as a well killing fluid has the advantages of certain clay expansion inhibition, low price, and high density. However, it is reflected in its use that it is easy to cause formation scaling and often cause blockage; after entering the formation, it will emulsify with the formation fluid, and in the middle and low permeability layers, it will also form water lock damage, resulting in a decline in formation production; at the same time Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528
CPCC09K8/528C09K2208/32
Inventor 胡成亮陈建光王兴伟宋玉文韩项勇饶富培李倩杜会尧季庆荣
Owner PETROCHINA CO LTD
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