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Modified cationic compound and preparation method thereof, and solid phase chemical cleaning agent for drilling fluids

A cationic compound, solid-phase chemical technology, applied in the field of its preparation, solid-phase chemical cleaners for drilling fluids, and modified cationic compounds, can solve the problems of reduced solid phase removal efficiency, increased mechanical removal of solid phase, and limited inhibition ability , to achieve the effects of inhibiting clay hydration and dispersion, controlling formation slurry, and protecting oil and gas layers

Active Publication Date: 2019-06-21
SINOPEC SSC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current non-dispersible drilling fluid has insufficient inhibition performance and cannot effectively inhibit the hydration expansion and dispersion of cuttings, which will inevitably increase the difficulty of mechanically removing solid phase, resulting in a decrease in solid phase removal efficiency
At the same time, there is a common contradiction between "drilling fluid performance stability" and "formation well wall stability" in drilling fluids, that is, while improving the drilling fluid inhibition, it affects or even destroys the colloidal stability of the drilling fluid
[0004] Therefore, the suppression ability of the existing drilling fluid system is limited, and it is not enough to control the solid phase content well.

Method used

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  • Modified cationic compound and preparation method thereof, and solid phase chemical cleaning agent for drilling fluids
  • Modified cationic compound and preparation method thereof, and solid phase chemical cleaning agent for drilling fluids
  • Modified cationic compound and preparation method thereof, and solid phase chemical cleaning agent for drilling fluids

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preparation example Construction

[0035] Correspondingly, the present invention provides a method for preparing a modified cationic compound, comprising: reacting tetraalkyldiamine and epihalohydrin in water in the presence of a catalyst to obtain a modified cationic compound; Tetraalkyldiamine is R 2 N-CH 2 (CH 2 ) t CH 2 -NR 2 ; The modified cationic compound has a formula I structure:

[0036]

[0037] Wherein, R is a C1-C5 alkyl group; X is a halogen; t is any integer between 0-6.

[0038] The preparation method of the present invention takes tetraalkyldiamine and epihalohydrin as reaction raw materials, and the molecular structure general formula of described tetraalkyldiamine is: R 2 N-CH 2 (CH 2 ) t CH 2 -NR 2 wherein, R is an alkyl group of C1-C5, preferably methyl or ethyl; t is any integer between 0-6, preferably 0, 1 or 2. In an embodiment of the present invention, the tetraalkyldiamine is preferably tetramethylethylenediamine, tetraethylethylenediamine, tetramethylpropylenediamine or...

Embodiment 1

[0059] 1. Preparation of modified cationic compound: Based on 100 parts by mass of raw materials, add 50 parts of water and 1 mol of tetramethylethylenediamine into the reaction kettle, and slowly add 2 mol of epichlorohydrin and 0.1 part of dodecyl under stirring Dimethyl benzyl ammonium chloride was added for 30 minutes, and reacted at 35° C. for 9 hours after the addition was completed; after the reaction time was up, vacuum dehydration was performed, and drying was performed to obtain 300 g of compound A.

[0060] The structure of compound A obtained in this example is uniquely determined, as shown in formula (1), wherein X is Cl.

[0061]

[0062] 2. The preparation method of the solid-phase chemical cleaner for drilling fluid comprises the following steps:

[0063] (1) In parts by mass, 1 part of ferric sulfate and 0.1 part of sodium silicate are mixed and ground uniformly to obtain the first mixture;

[0064] (2) Mix 100 parts of obtained Compound A with 10 parts of...

Embodiment 2

[0067] 1. Preparation of modified cationic compound: based on 100 parts by mass of raw materials, add 100 parts of water and 1 mol of tetraethylethylenediamine into the reaction kettle, and slowly add 2.1 mol of epichlorohydrin and 1 part of dodecane under stirring Dimethyl benzyl ammonium chloride was added for 60 minutes. After the addition was completed, it was reacted at 60°C for 3 hours; The structure of Compound A obtained in this example is shown in Formula I, wherein R is ethyl, X is Cl, and t is 0.

[0068] 2. The preparation method of the solid-phase chemical cleaner for drilling fluid comprises the following steps:

[0069] (1) In parts by mass, 5 parts of ferrous sulfate and 3 parts of potassium silicate are mixed and ground uniformly to obtain the first mixture;

[0070] (2) Mix 100 parts of obtained compound A with 40 parts of ammonium citrate to obtain a second mixture;

[0071] (3) Mix the first mixture and the second mixture uniformly, dry at 120° C. for 4 h...

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Abstract

The invention belongs to the technical field of water-soluble cationic compounds in petroleum drilling oilfield chemistry, and provides a modified cationic compound and a preparation method thereof, and a solid phase chemical cleaning agent for drilling fluids, wherein the modified cationic compound has a structure represented by a formula I, R is C1-C5 alkyl, X is halogen, t is an arbitrary integer selected from 0-6, and the solid phase chemical cleaning agent comprises an iron salt, an ammonium salt, a silicate and the modified cationic compound. According to the present invention, the solidphase chemical cleaning agent for drilling fluids is obtained by using the modified cationic compound, wherein the modified cationic compound has the structure represented by the formula I, and has double effects of flocculation and inhibition, such that the inhibition ability of drilling fluids and the drilling fluid solid phase removal efficiency can be improved so as to achieve low solid phaserapid drilling. The formula I is defined in the specification.

Description

technical field [0001] The invention belongs to the technical field of chemical water-soluble cationic compounds for petroleum drilling and oil fields, and in particular relates to a modified cationic compound, a preparation method thereof and a solid-phase chemical cleaning agent for drilling fluid. Background technique [0002] In petroleum drilling, the solid phase content has a direct impact on the density, viscosity, filter cake, oil and gas layers and environment of drilling fluid. Drilling fluid solid phase control technology mainly removes useless inert solid phase in drilling fluid through chemical and mechanical methods, and at the same time controls the active solid phase within a certain range. The useless solid phase and part of the active solid phase mainly come from drilling cuttings; too high solid phase content in the drilling fluid will easily lead to lower drilling speed, pollution of oil and gas layers, difficult maintenance of drilling fluid performance,...

Claims

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Application Information

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IPC IPC(8): C07D303/36C07D301/27C09K8/03C09K8/035C09K8/52
Inventor 王中华
Owner SINOPEC SSC
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