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Novel inhibitor for drilling fluid and preparation method

A technology of inhibitors and drilling fluids, applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of not fully satisfying drilling needs, polluting the environment, poor inhibition, etc., and achieves easy mass production and low cost of raw materials. , the effect of inhibiting hydration swelling

Active Publication Date: 2020-06-09
新乡市振华钻井液材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new type of inhibitor for drilling fluid and its preparation method to solve the technical problems that the drilling fluid inhibitor in the prior art cannot fully meet the needs of drilling, has poor inhibition, is difficult to control, and pollutes the environment.

Method used

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preparation example Construction

[0022] The present invention also provides a method for preparing a novel drilling fluid inhibitor, comprising the following steps,

[0023] (1) take each raw material by weight ratio;

[0024] (2) Inject ethylenediamine into the reactor, and slowly raise the temperature in the reactor to 70°C-75°C;

[0025] (3) Slowly add ethylene dichloride dropwise in ethylenediamine under continuous stirring conditions, stop heating after the dropwise addition, and continue to react under continuous stirring conditions;

[0026] (4) After the reaction finishes, the reaction solution is gradually returned to room temperature, then potassium chloride and water are added to the reaction system successively, and the mixture is homogeneously obtained to obtain the product;

[0027] (5) Take the above-mentioned products for inspection. After passing the inspection, fill and determine the weight and seal the package.

[0028] Preferably, the dropwise addition time of dichloroethane in the step ...

Embodiment 1

[0032] A novel inhibitor for drilling fluid. The raw materials of the inhibitor include: 30 parts of ethylenediamine, 20 parts of dichloroethane, 10 parts of potassium chloride, and 20 parts of water.

[0033] Ethylenediamine is kept in excess to avoid the reaction to generate quaternary ammonium salt by-products; potassium chloride is used as a drilling fluid inhibitor, and it can still remain very stable under high temperature, high pressure, and wide acid-base conditions. Potassium chloride inhibitor ionizes potassium ions in water. Potassium ions can enter between clay sheets and be fixed by the lattice of ions to make the clay layer form a compact structure, reduce the distance between clay layers, inhibit the internal hydration expansion of clay, and inhibit the clay osmotic hydration.

[0034] The preparation method of above-mentioned novel drilling fluid inhibitor, comprises the following steps:

[0035] (1) take each raw material by weight ratio;

[0036] (2) Inject...

Embodiment 2

[0042] A novel inhibitor for drilling fluid, the raw materials of the inhibitor include: 60 parts of ethylenediamine, 50 parts of ethylene dichloride, 30 parts of potassium chloride, and 40 parts of water.

[0043] The preparation method of above-mentioned novel drilling fluid inhibitor, comprises the following steps:

[0044] (1) take each raw material by weight ratio;

[0045] (2) Inject ethylenediamine into the reactor, and slowly raise the temperature in the reactor to 70°C-75°C;

[0046] (3) Slowly add dichloroethane dropwise to ethylenediamine under the condition of continuous stirring, the dropwise addition time of dichloroethane is 40min, pay attention to control the reaction temperature in the range of 70°C-75°C during the dropwise addition, Stop heating after dropwise addition, continue to react 20min under constant stirring condition;

[0047] (4) After the reaction is over, the reaction solution is gradually returned to room temperature, potassium chloride is add...

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Abstract

The invention relates to a novel inhibitor for drilling fluid and a preparation method thereof, and belongs to the technical field of drilling fluid treatment agents. The inhibitor comprises the following raw materials by weight: 30-60 parts of ethylenediamine, 20-50 parts of dichloroethane, 10-30 parts of potassium chloride, and 20-40 parts of water. The preparation method of the inhibitor comprises the following steps: heating ethylenediamine to 70-75 DEG C, slowly dropwise adding dichloroethane into the ethylenediamine, stopping heating after dropwise adding, continuing reaction, graduallyrecovering the reaction liquid to room temperature after the reaction is finished, sequentially adding potassium chloride and water into the reaction system, uniformly mixing to obtain a product, finally taking and inspecting the product, and after the product is inspected to be qualified, carrying out filling, weight fixing, sealing and packaging. The inhibitor is formed by compounding the polyamine compound and the potassium chloride according to a certain proportion, the polyamine compound and the potassium chloride have a good synergistic effect, an obvious inhibiting effect on clay expansion in shale is achieved, the influence on rheological property and wall-building property of drilling fluid is small, no pollution is caused to the environment, the preparation process is simple, andthe production cost is low.

Description

technical field [0001] The invention belongs to the technical field of treatment agents for drilling fluids, in particular to a novel inhibitor for drilling fluids and a preparation method. Background technique [0002] Well wall instability is a serious problem in the process of oil and natural gas drilling and production. Well wall instability will lead to a series of problems such as diameter shrinkage, collapse and sticking, and hole expansion, which will bring great harm to drilling engineering. When drilling wells, about 75% of the drilled formations are shale formations, and 90% of wellbore instability occurs in shale formations. Because the shale formation is rich in water-absorbing clay minerals and has a remarkable nano-pore structure, it is easy to hydrate and swell and disperse. [0003] Commonly used mud shale inhibitors in the prior art mainly include polymers, inorganic salts, asphalt and humic acids, etc., but these shale inhibitors all have some shortcoming...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/03C08G73/02
CPCC09K8/032C09K8/035C08G73/02C09K2208/12
Inventor 周瑜葛赵录亮周庆丰
Owner 新乡市振华钻井液材料有限公司
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