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Drilling fluid and preparation method thereof

A technology of drilling fluid and polyamine polymer, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high inorganic potassium salt content, limited inhibitory performance and anti-slump performance, and achieve no biological toxicity, The effect of inhibiting the wall water absorption instability and inhibiting hydration

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This drilling fluid system not only has a high content of inorganic potassium salts, but also has problems in subsequent treatment, and also has shortcomings such as limited inhibition performance and anti-slump performance in practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The polyamine polymer is the product of the reaction of butylenediamine, butylene oxide and epoxychlorobutane. The preparation method is to add butylene oxide dropwise to butylenediamine under the condition of stirring and 100°C, react for 1h, and then Raise the temperature to 140°C, add epichlorobutane dropwise under stirring, add formic acid for 1 hour of reaction, and continue reaction for 1 hour to obtain a cationic polyamine polymer sample. Control the molar ratio of butanediamine, butylene oxide, epoxychlorobutane and formic acid to 1:4:0.4:0.8, and its kinematic viscosity is 456.4mm 2 / s, cationic degree is 0.906mmol / g. The specific mass fraction of each component is shown in Table 3.

[0016] Table 3 Strong inhibitory drilling fluid formula

[0017] components parts by weight 1 Bentonite 5 2 Low Viscosity Sodium Carboxymethyl Cellulose 0.7 3 Zwitterionic Sulfonate Copolymer 0.6 4 sodium hydroxide 0.2 5 polyamine ...

Embodiment 2

[0019] Polyamine polymer is the reaction product of pentamethylenediamine, propylene oxide and epibromohydrin. The preparation method is to add propylene oxide dropwise to pentamethylenediamine under the condition of stirring and 80°C, react for 4 hours, and then raise the temperature to To 98°C, add epibromohydrin dropwise under stirring condition, add glacial acetic acid for 3 hours of reaction, continue reaction for 2 hours, and obtain a cationic polyamine polymer sample. Control the molar ratio of pentamethylenediamine, propylene oxide, epibromohydrin and glacial acetic acid to 1:2:0.5:1.0, and its kinematic viscosity is 857.3 mm 2 / s, cationic degree is 1.568mmol / g. The specific mass fraction of each component is shown in Table 2.

[0020] Table 2 Drilling fluid formula

[0021] components parts by weight 1 Bentonite 4 2 Low Viscosity Sodium Carboxymethyl Cellulose 0.5 3 Zwitterionic Sulfonate Copolymer 0.4 4 sodium hydroxide 0....

Embodiment 3

[0023] The polyamine polymer is the reaction product of hexamethylene diamine, propylene oxide and epichlorohydrin. The preparation method is to add propylene oxide dropwise to hexamethylene diamine under the condition of stirring and 60°C, react for 4 hours, and then raise the temperature to To 90°C, add epichlorohydrin dropwise under stirring conditions, add hydrochloric acid for 4 hours of reaction, and continue reaction for 4 hours to obtain a cationic polyamine polymer sample. Control the molar ratio of hexamethylenediamine, propylene oxide, epichlorohydrin and hydrochloric acid to 1:0.8:0.7:2.0. The kinematic viscosity of the prepared polyamine polymer is 1203.3 mm 2 / s, the cationic degree is 2.986mmol / g. The specific mass fraction of each component in the drilling fluid is shown in Table 1.

[0024] Table 1 Drilling fluid formula

[0025] components parts by weight 1 Bentonite 3 2 Low Viscosity Sodium Carboxymethyl Cellulose 0.3 3 Z...

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Abstract

The invention discloses a drilling fluid and a preparation method thereof. The drilling fluid comprises, by weight, 2.0 to 6.0 parts of bentonite, 0.1 to 1 part of sodium carboxymethylcellulose, 0.2 to 0.8 part of a zwitter-ion sulphonate copolymer, 0.03 to 0.4 part of sodium hydroxide, 0.1 to 0.8 of a polyamine polymer, and 100 parts of water; the polyamine polymer is a polymer of terminal diamine, a cyclic ether, and an epoxy alkyl halide. The preparation method comprises following steps: the polyamine polymer is prepared firstly, wherein the polyamine polymer is prepared via copolymerization of terminal diamine, the cyclic ether, and the epoxy alkyl halide; and then an aqueous solution containing bentonite, sodium carboxymethylcellulose, the zwitter-ion sulphonate copolymer, sodium hydroxide, the polyamine polymer, and water is prepared according to the stoichiometric ratio so as to obtain the drilling fluid. The drilling fluid is excellent in system inhibition performance and collapse resistance, and contains no sylvite, so that subsequent processing on high salt content is unnecessary.

Description

technical field [0001] The invention relates to a drilling fluid and a preparation method thereof, in particular to a strongly inhibiting polymer drilling fluid and a preparation method and application thereof. Background technique [0002] In drilling engineering, 75% of the formations encountered are mud shale layers, and about 90% of wellbore instability problems occur in mud shale well sections. The application of drilling fluid containing potassium ions makes the shale dispersion and slurrying well controlled, the content of submicron particles and inferior solid phase in the drilling fluid is greatly reduced, and the mechanical speed of penetration is greatly improved. However, with the continuous application of technology, some shortcomings have also been exposed, such as poor drilling fluid suppression ability and limited anti-slump effect, and there are still some deficiencies in solving the problems of dispersed mud generation in shale formations and water absorpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
CPCC09K8/24C09K2208/12
Inventor 鲁娇杨超陈楠张喜文尹泽群赵景霞黎元生方向晨
Owner CHINA PETROLEUM & CHEM CORP
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