A kind of water-in-oil drilling fluid and preparation method thereof

Abstract

The invention provides a water-in-oil based drilling fluid. The water-in-oil based drilling fluid comprises the following components by weight: 0 to 3 parts of an emulsifier, 1 to 3 parts of organic soil, 1 to 5 parts of a performance regulator, 100 parts of an oil-water base, and a weighting agent which enables the density of the drilling fluid to reach 1.50 to 2.10 g / cm<3>, wherein the performance regulator is a modified asphalt particle which contains asphalt and a modifier; the modifier contains polymeric sulfur and free sulfur; the content of a sulfur element accounts for 10 to 40% of thetotal amount of the modified asphalt particle by weight; the content of the polymeric sulfur accounts for 30 to 70% of the total amount of the sulfur element by weight; and the total particle size ofthe modified asphalt particle is no more than 150 [mu]m. The drilling fluid provided by the invention utilizes the modified asphalt particle as the regulator, and the asphalt particle with a high softening point can maintain good particle state and high-temperature deformation ability in the water-in-oil based drilling fluid, so the effects of plugging and filtrate loss reduction are improved.

Description

technical field

[0001] The invention relates to a water-in-oil drilling fluid, in particular to a drilling fluid containing a modified high softening point asphalt composition, and belongs to the technical field of petroleum drilling and production. Background technique

[0002] With the gradual development of oil and gas exploration to deep layers, the chances of drilling high-temperature and high-pressure formations are gradually increasing. All of these put forward higher requirements on the drilling fluid system. Compared with water-based drilling fluid, oil-based drilling fluid has strong anti-pollution ability, good lubricity, strong inhibition, is conducive to maintaining the stability of the well wall, can protect oil and gas layers to the greatest extent, and is easy to maintain. The excellent high-temperature stability and inhibition of oil-based drilling fluid make it more advantageous in drilling complex wells, especially in high-temperature deep wells and water...

Examples

Embodiment 1

[0045] Add 425g of oxidized asphalt with a softening point of 128.6°C to water, crush it with a high shear machine for 20 minutes, then add 10.6g of fatty alcohol polyoxyethylene ether (AEO-7) and 0.15g of diisopropyl xanthate disulfide , to obtain bituminous liquid; heat 75g of sulfur to 130°C, and after 15 minutes, heat to 520°C, while feeding N 2 , keep the pressure at 1.0MPa for 60 minutes to form polymerized sulfur vapor. Spray polymerized sulfur steam into the above asphalt liquid to form asphalt particles coated with modifier and suspend in the asphalt liquid, keep at 20°C for 40 minutes to fully stabilize and solidify, then dehydrate and dry. The obtained solid is sieved with a vibrating sieve to obtain modified asphalt granules.

[0046] Prepare drilling fluid according to oil-water ratio (80:20): First, measure 800ml 3# white oil with a measuring cylinder, add 0.8 parts of lauroyldiethanolamine, stir for 15 minutes, add 1.5 parts of organic soil, and stir for 5 minu...

Embodiment 2

[0048] Add 400g of oxidized asphalt with a softening point of 134.8°C to water, crush it with a high shear machine for 25 minutes, then add 13.2g of octadecylamine polyoxyethylene ether and 0.1g of isopropanol to obtain asphalt liquid; heat 100g of sulfur to 135 ℃, heated to 550℃ after 10 minutes, while feeding N 2 , keep the pressure at 1.6MPa for 50 minutes to form polymerized sulfur vapor. Spray polymerized sulfur steam into the above asphalt liquid to form asphalt particles coated with modifier and suspend in the asphalt liquid, keep at 25°C for 60 minutes to fully stabilize and solidify, then dehydrate and dry. The obtained solid is sieved with a vibrating sieve to obtain modified asphalt granules.

[0049] Prepare the drilling fluid according to the oil-water ratio (65:35): First, measure 650ml of 5# white oil with a graduated cylinder, add 0.2 parts of polyoxyethylene stearate, stir for 20 minutes, add 1.0 parts of organic soil, and stir for 10 minutes. Mix 25% calciu...

Embodiment 3

[0051] Add 375g of oxidized asphalt with a softening point of 145.8°C to water, crush it with a high shear machine for 25 minutes, then add 17.6g of alkylphenol polyoxyethylene ether (OP-10) and 0.25g of 4-chloro-1-butanol, To obtain asphalt liquid; heat 125g of sulfur to 145°C, and then heat to 540°C after 15 minutes, while feeding N 2 , and keep the pressure at 1.5MPa for 45 minutes to form polymerized sulfur vapor. Spray polymerized sulfur steam into the above asphalt liquid to form asphalt particles coated with modifier and suspend in the asphalt liquid, keep at 30°C for 50 minutes to fully stabilize and solidify, then dehydrate and dry. The obtained solid is sieved with a vibrating sieve to obtain modified asphalt granules.

[0052] Prepare the drilling fluid according to the oil-water ratio (70:30): First, measure 700ml of 5# white oil with a graduated cylinder, add 0.6 parts of oleoyldiethanolamine, stir for 15 minutes, add 1.6 parts of organic soil, and stir for 10 mi...

technical field

[0001] The invention relates to a water-in-oil drilling fluid, in particular to a drilling fluid containing a modified high softening point asphalt composition, and belongs to the technical field of petroleum drilling and production. Background technique

[0002] With the gradual development of oil and gas exploration to deep layers, the chances of drilling high-temperature and high-pressure formations are gradually increasing. All of these put forward higher requirements on the drilling fluid system. Compared with water-based drilling fluid, oil-based drilling fluid has strong anti-pollution ability, good lubricity, strong inhibition, is conducive to maintaining the stability of the well wall, can protect oil and gas layers to the greatest extent, and is easy to maintain. The excellent high-temperature stability and inhibition of oil-based drilling fluid make it more advantageous in drilling complex wells, especially in high-temperature deep wells and water...

Examples

Embodiment 1

[0045] Add 425g of oxidized asphalt with a softening point of 128.6°C to water, crush it with a high shear machine for 20 minutes, then add 10.6g of fatty alcohol polyoxyethylene ether (AEO-7) and 0.15g of diisopropyl xanthate disulfide , to obtain bituminous liquid; heat 75g of sulfur to 130°C, and after 15 minutes, heat to 520°C, while feeding N 2 , keep the pressure at 1.0MPa for 60 minutes to form polymerized sulfur vapor. Spray polymerized sulfur steam into the above asphalt liquid to form asphalt particles coated with modifier and suspend in the asphalt liquid, keep at 20°C for 40 minutes to fully stabilize and solidify, then dehydrate and dry. The obtained solid is sieved with a vibrating sieve to obtain modified asphalt granules.

[0046] Prepare drilling fluid according to oil-water ratio (80:20): First, measure 800ml 3# white oil with a measuring cylinder, add 0.8 parts of lauroyldiethanolamine, stir for 15 minutes, add 1.5 parts of organic soil, and stir for 5 minu...

Embodiment 2

[0048] Add 400g of oxidized asphalt with a softening point of 134.8°C to water, crush it with a high shear machine for 25 minutes, then add 13.2g of octadecylamine polyoxyethylene ether and 0.1g of isopropanol to obtain asphalt liquid; heat 100g of sulfur to 135 ℃, heated to 550℃ after 10 minutes, while feeding N 2 , keep the pressure at 1.6MPa for 50 minutes to form polymerized sulfur vapor. Spray polymerized sulfur steam into the above asphalt liquid to form asphalt particles coated with modifier and suspend in the asphalt liquid, keep at 25°C for 60 minutes to fully stabilize and solidify, then dehydrate and dry. The obtained solid is sieved with a vibrating sieve to obtain modified asphalt granules.

[0049] Prepare the drilling fluid according to the oil-water ratio (65:35): First, measure 650ml of 5# white oil with a graduated cylinder, add 0.2 parts of polyoxyethylene stearate, stir for 20 minutes, add 1.0 parts of organic soil, and stir for 10 minutes. Mix 25% calciu...

Embodiment 3

[0051] Add 375g of oxidized asphalt with a softening point of 145.8°C to water, crush it with a high shear machine for 25 minutes, then add 17.6g of alkylphenol polyoxyethylene ether (OP-10) and 0.25g of 4-chloro-1-butanol, To obtain asphalt liquid; heat 125g of sulfur to 145°C, and then heat to 540°C after 15 minutes, while feeding N 2 , and keep the pressure at 1.5MPa for 45 minutes to form polymerized sulfur vapor. Spray polymerized sulfur steam into the above asphalt liquid to form asphalt particles coated with modifier and suspend in the asphalt liquid, keep at 30°C for 50 minutes to fully stabilize and solidify, then dehydrate and dry. The obtained solid is sieved with a vibrating sieve to obtain modified asphalt granules.

[0052] Prepare the drilling fluid according to the oil-water ratio (70:30): First, measure 700ml of 5# white oil with a graduated cylinder, add 0.6 parts of oleoyldiethanolamine, stir for 15 minutes, add 1.6 parts of organic soil, and stir for 10 mi...

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