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Full oil base drilling fluid and preparation method thereof

A drilling fluid, all-oil-based technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of solid phase damage, formation damage, large difference in water phase activity, strong water sensitivity, etc. Small loss, excellent temperature resistance, good stability

Active Publication Date: 2019-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that the emulsified droplets and organic soil particles in the oil-based drilling fluid in the prior art cause unconventional low pressure and low permeability, strong water sensitivity, large difference in water phase activity, and easy to cause solid phase damage. Formation damage problem, providing an all-oil-based drilling fluid can solve this problem, to meet the special needs of conventional drilling, extended-reach special wells, offshore horizontal wells, etc.

Method used

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  • Full oil base drilling fluid and preparation method thereof
  • Full oil base drilling fluid and preparation method thereof
  • Full oil base drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (a) Synthesis of N, N'-bisstearyl hydroxyethyl ethylenediamine (x=2)

[0044] Add 49 parts of N-hydroxyethylethylenediamine and 2.7 parts of KOH into a reactor equipped with a sealed mechanical stirrer, a thermometer, a straight condenser tube, and a receiving bottle. After stirring at 145°C for 1 hour, slowly add hard 270 parts of fatty acid methyl esters were added dropwise within 1 hour. React at 165°C for 12 hours, and the methanol generated in the reaction is collected into a receiving bottle through a straight condenser. The remaining low-boiling products and reaction raw materials were distilled off under reduced pressure to obtain the target product N,N'-bisstearyl hydroxyethyl ethylenediamine.

[0045] (b) Synthesis of N, N'-distearoyl hydroxyethyl ethylenediamine polyoxypropylene ether (y=1, z=10)

[0046] 203 grams of N, N'-distearoyl hydroxyethyl ethylenediamine and 185.4 parts of propylene oxide under the action of 7.6 parts of calcium oxide and calcium h...

Embodiment 2

[0056] (a) Preparation of N, N'-dierucic acid acyl hydroxyethyl propylenediamine (x=3)

[0057] Add 47.13 parts of N-hydroxyethylpropylenediamine and 5.6 parts of KOH into a reactor equipped with a sealed mechanical stirrer, a thermometer, a straight condenser tube, and a receiving bottle. After stirring at 150°C for 1 hour, slowly add 281.3 parts of methyl erucate were added dropwise within 1 hour. The reaction was stopped after 10 hours at 170°C, and the methanol generated in the reaction was collected into the receiving bottle through a straight condenser. The remaining low-boiling products and reaction raw materials were distilled off under reduced pressure to obtain the target product N, N'-dierucic acid acyl hydroxyethyl propylenediamine.

[0058] (b) Synthesis of N, N'-dierucic acid acyl hydroxyethyl propylenediamine polyoxyethylene polyoxypropylene ether (y=10, z=20)

[0059] Add 320 parts of N,N'-dierucic acid acyl hydroxyethyl propylenediamine synthesized in step (...

Embodiment 3

[0065] (a) Synthesis of N, N'-diplant oleic acid acyl hydroxyethyl propylene diamine (x=3)

[0066] Add 55.3 parts of N-hydroxyethylpropylenediamine and 8.33 parts of KOH into a reactor equipped with a sealed mechanical stirrer, a thermometer, a straight condenser tube, and a receiving bottle. After stirring at 150°C for 1 hour, slowly increase the Soybean fatty acid methyl ester (in terms of mass percentage, soybean fatty acid methyl ester contains the following components: methyl myristate 0.557%, methyl palmitate 18.250%, methyl palmitoleate 1.402%, methyl stearate 5.495% fat, 30.203% methyl oleate, 36.000% methyl linoleate, 3.587% methyl linolenate, and the rest.) 277.6 parts, the dropwise addition was completed within 1 hour. React at 165°C for 8 hours, and the methanol generated in the reaction is collected into the receiving bottle through a straight condenser. The remaining low-boiling products and reaction raw materials were distilled off under reduced pressure to ob...

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Abstract

The invention relates to a whole oil base drilling fluid and a preparation method thereof, and mainly solves the problems that in the prior art, due to the emulsified droplets and organic soil particles in oil base drilling fluid, abnormal low pressure and low penetration exist, the differences of water sensitivity and water phase activity are large, solid phase that damages the stratum can be easily formed, and the oil base drilling fluid has a bad performance on resisting water invasion. The whole oil base drilling fluid comprises the following components (1) 100 parts of base oil; (2) not less than 0.5 part of composite emulsifier comprising a main emulsifier (I) and an auxiliary emulsifier (II); (3) 0.1 to 5 parts of tackifier; (4) 0.5 to 5 parts of fluid loss reducer; (5) 0 to 5 parts of alkaline substances. The whole oil base drilling fluid can be applied to drilling wells having the problems mentioned above.

Description

technical field [0001] The invention relates to an all-oil-based drilling fluid and a preparation method thereof, which is suitable for unconventional drilling and completion processes with low pressure and low permeability, water sensitivity, large difference in water phase activity, and easy to cause solid phase damage to formation oil and gas reservoirs. Background technique [0002] With the continuous reduction of oil reserves and the difficulty of mining, countries all over the world have increased investment in the exploration and development of oil and gas resources in complex formations. The development of new oil reservoirs has become an urgent requirement for the development of major oil companies today. At present, oil fields at home and abroad, especially large domestic oil fields, have entered the later stage of development, and gradually began to explore and develop some low-pressure and low-permeability reservoirs, water-sensitive formations with large differe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/34
Inventor 高磊裘鋆沙鸥
Owner CHINA PETROLEUM & CHEM CORP