A deep-water constant-rheology oil-based drilling fluid

An oil-based drilling fluid and deep water technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as low-temperature viscosity increase and lower equivalent circulation density of drilling fluid, so as to achieve low cost and avoid excessive equivalent circulation density. High, reduce workload and cost effect
CN104861944BActive Publication Date: 2018-04-17CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Publication Date
2018-04-17

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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.
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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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