Deepwater constant-rheology oil base drilling fluid

An oil-based drilling fluid and deep-water technology, which is applied in the direction of drilling compositions, chemical instruments and methods, can solve the problems of reducing the equivalent circulating density of drilling fluid and increasing viscosity at low temperature, so as to avoid excessively high equivalent circulating density and cost Low, the effect of meeting the technical requirements of marine deepwater drilling

Active Publication Date: 2015-08-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a constant rheology oil-based drilling fluid, which can provide stable rheology in the deep water drilling wellbore temperature range (4 ~ 65 ℃), and solve the problem of low-temperature viscosity increase that may be caused by traditional oil-based drilling fluids. Reduce the bottom hole excitation pressure when the pump is turned on during deepwater drilling operations, reduce the equivalent circulating density of drilling fluid, and avoid leakage; it has filtration loss reduction and anti-pollution performance, and solves technical problems in deepwater drilling fluids

Method used

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  • Deepwater constant-rheology oil base drilling fluid
  • Deepwater constant-rheology oil base drilling fluid

Examples

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Embodiment 1

[0029] Deepwater constant rheology oil-based drilling fluid includes the following components in parts by mass:

[0030] 80 parts of 5# white oil, 20 parts of calcium chloride aqueous solution, 3.5 parts of flow regulator, 3 parts of emulsifier, 2 parts of wetting agent, 1 part of organic soil for drilling fluid, 2 parts of fluid loss reducer, 0.4 parts of calcium oxide Parts, 50 parts of weighting agent.

[0031] The mass fraction of the calcium chloride aqueous solution used in the present embodiment is 25%.

[0032] The flow regulator used in this example is made by mixing trimer acid and diethylene propylene rubber in a mass ratio of 1:1.

[0033] The emulsifier used in this example is formed by mixing oxyethyl alkylphenol ether and a copolymer formed by the reaction of oleic acid and ethanolamine in a mass ratio of 2:1.

[0034] The wetting agent used in this example is prepared by mixing naphthenic acid amide and polyoxyethylene alkylphenol ether in a mass ratio of 1:1...

Embodiment 2

[0039] Deepwater constant rheology oil-based drilling fluid includes the following components in parts by mass:

[0040] 75 parts of 0# white oil, 25 parts of calcium chloride aqueous solution, 3.5 parts of flow regulator, 3 parts of emulsifier, 2 parts of wetting agent, 1 part of organic soil for drilling fluid, 3 parts of fluid loss reducer, 0.5 parts of calcium oxide Parts, weighting agent 100 parts.

[0041] The mass fraction of the calcium chloride aqueous solution used in the present embodiment is 20%.

[0042] The flow regulator used in this example is formed by mixing dimer acid, a copolymer formed by the reaction of ethanolamine and triethylenetetramine, and ethylene-propylene-diene rubber in a mass ratio of 2:1.

[0043] The emulsifier used in this example is formed by mixing oleic acid amide and sodium alkylbenzene sulfonate in a mass ratio of 1.5:1.

[0044] The wetting agent used in this example is prepared by mixing naphthenic acid amide and octylphenol ethoxyl...

Embodiment 3

[0049] Deepwater constant rheology oil-based drilling fluid includes the following components in parts by mass:

[0050]80 parts of 3# white oil, 20 parts of calcium chloride aqueous solution, 4 parts of flow regulator, 3.5 parts of emulsifier, 2.5 parts of wetting agent, 1 part of organic soil for drilling fluid, 3 parts of fluid loss reducer, 0.6 parts of calcium oxide Parts, 260 parts of weighting agent.

[0051] The mass fraction of the calcium chloride aqueous solution used in the present embodiment is 20%.

[0052] The flow regulator used in this example is a copolymer produced by the reaction of dimer acid, ethanolamine and diethylenetriamine and a copolymer produced by the reaction of N-hexadecyl acrylamide, styrene and methacrylic acid according to 2:1 mass ratio mixed.

[0053] The emulsifier used in this example is formed by mixing oleic acid amide and oxyethyl alkylphenol ether in a mass ratio of 1.5:1.

[0054] The wetting agent used in this example is prepared...

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Abstract

The invention discloses a deepwater constant-rheology oil base drilling fluid applicable for deep sea drilling. The deepwater constant-rheology oil base drilling fluid applicable for deep sea drilling comprises the following components in parts by weight: 70-100 parts of white oil, 0-30 parts of a calcium chloride aqueous solution, 1.5-5 parts of a fluid type conditioning agent, 1-4 parts of an emulsifying agent, 0.5-2.5 parts of a wetting agent, 1-3.5 parts of organic soil used for drilling fluid, 1.5-5 parts of a filtrate reducer, 0.2-0.6 parts of calcium oxide and 0-260 parts of a weighting agent. The fluid type conditioning agent is at least one of ethylene-propylene copolymer, polymethacrylate, trimeric acid, phenolic resin, copolymer generated from reaction of dimer acid, cholamine and polyethylene polyamine and copolymer generated from reaction of acrylamide, styrene and methacrylic acid. The movable shearing force and six-speed viscometer of the oil base drilling fluid is respectively less than 6 r/min and 3 r/min, and the 10-min static shearing force can be kept steady within 4-65 DEG C; constant eheology is realized in the temperature range of the barrel of the deepwater drilling, technical demands on sea deepwater drilling can be satisfied, requirements on base oil raw material are loose, and the cost is low.

Description

technical field [0001] The invention relates to a drilling fluid for petroleum drilling, in particular to a constant rheological oil-based drilling fluid suitable for deep-water drilling and capable of maintaining stable rheology within the temperature range of the deep-water drilling wellbore. Background technique [0002] In marine deepwater drilling operations, the low-temperature and high-pressure environment on the deep seabed and complex geological conditions have brought a series of technical difficulties to marine deepwater drilling fluid technology, including difficulty in controlling the low-temperature rheology of drilling fluid, clogging caused by the formation of natural gas hydrate, Wellbore instability in complex formations, etc. Oil-based drilling fluid or synthetic-based drilling fluid can provide excellent wellbore stability and maximize ROP, and is the first choice for drilling in complex formations. However, the rheological properties of traditional oil-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32
CPCC09K8/32
Inventor 邱正松赵欣刘扣其曹杰黄维安钟汉毅邢晓东
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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