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A kind of high temperature resistant water base drilling fluid and preparation method thereof

A water-based drilling fluid and high-temperature-resistant technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as poor dispersion performance, low asphalt softening point, large particles, etc., to achieve increased yield and stability Good for stability, dispersion, and performance improvement

Active Publication Date: 2019-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The asphalt product used in the drilling fluid in the prior art has a low softening point, large particles, and poor dispersion performance in the drilling fluid, which cannot well meet the plugging and anti-collapse of the drilling fluid, stabilize the well wall, and reduce filtration. In order to solve problems such as loss of use performance, the present invention provides a water-based drilling fluid that can withstand high temperatures, which includes a kind of asphalt fluid containing modified high-softening point asphalt particles. The asphalt particles have a small particle size and can be used in water-based drilling Stable dispersion in the fluid, greatly improving the performance of drilling fluid plugging, anti-slumping, stabilizing the well wall, and reducing fluid loss

Method used

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  • A kind of high temperature resistant water base drilling fluid and preparation method thereof
  • A kind of high temperature resistant water base drilling fluid and preparation method thereof

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Effect test

Embodiment 1

[0038]Take 400g of oxidized asphalt with a softening point of 123.4°C and add it to 360g of cold water and use a high-shear emulsifier to pulverize it for 30 minutes, then add 20g of stearylamine polyoxyethylene ether and 0.1g of isopropanol and continue mixing for 10 minutes to make the asphalt particles Disperse evenly in water; heat 100g of sulfur powder in a sulfur melting kettle to 135°C, keep it for 20 minutes, and then enter the reaction kettle. The temperature of the reaction kettle is controlled at 540°C, and N 2 , keep the pressure at 1.0 MPa. This condition was maintained for 30 minutes. Then open the discharge valve at the bottom of the reaction kettle, quickly spray the steam containing polymerized sulfur into the cold water containing bitumen prepared above for rapid cooling, and keep it at 50°C for 40 minutes to fully solidify and stabilize, and obtain the improved High softening point asphalt liquid (average particle size of asphalt is 115mm, measured for modi...

Embodiment 2

[0041] Take 425g of solvent-deoiled asphalt with a softening point of 138.5°C and add it to 450g of cold water and use a high-shear emulsifier to pulverize it for 35 minutes, then add 25.5g of fatty alcohol polyoxyethylene ether (AEO-7) and 0.35g of diisosulfide disulfide Propyl xanthate continued to mix for 20 minutes to disperse the asphalt particles evenly in the water; put 75g of sulfur powder in a sulfur melting tank and heat it to 140°C, keep it for 25 minutes, and then put it into the reactor, and the temperature of the reactor was controlled at 550 ℃, while feeding N 2 , to maintain a pressure of 0.8 MPa. This condition was maintained for 30 minutes. Then open the discharge valve at the bottom of the reaction kettle, quickly spray the steam containing polymerized sulfur into the cold water containing bitumen prepared above for rapid cooling, keep it at 55°C for 50 minutes, fully solidify and stabilize, and obtain the improved Bituminous liquid with high softening poi...

Embodiment 3

[0044] Take 350g of natural asphalt with a softening point of 143.6°C and add it to 400g of cold water and use a high-shear emulsifier to pulverize it for 40 minutes, then add 17.5g of dodecylamine polyoxyethylene ether and 0.2g of 4-chloro-1-butanol to continue mixing For 25 minutes, the asphalt particles were evenly dispersed in the water; 150g of sulfur powder was placed in a sulfur melting kettle and heated to 130°C, kept for 45 minutes, and then entered into the reactor, the temperature of the reactor was controlled at 580°C, and N 2 , keep the pressure at 0.6 MPa. This condition was maintained for 40 minutes. Then open the discharge valve at the bottom of the reaction kettle, quickly spray the steam containing polymerized sulfur into the cold water containing bitumen prepared above for rapid cooling, keep it at 60°C for 40 minutes, fully solidify and stabilize, and obtain the improved Bituminous liquid with high softening point (the average particle size of bitumen is 9...

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Abstract

The invention discloses high-temperature resistant water-based drilling fluid and a preparation method thereof. The high-temperature resistant water-based drilling fluid comprises base slurry and a modified high-softening point asphalt liquid, wherein the modified high-softening point asphalt liquid comprises modified high-softening point asphalt granules, water, a stable dispersing agent and a stabilizer; the particle size of the modified high-softening point asphalt granules is less than or equal to 120 mum; the modified high-softening point asphalt granules comprise 7-9 parts by mass of kernels consisting of basic asphalt and 1-3 parts by mass of shells formed by a modifier; the modifier comprises poly-sulfur and free sulfur; the weight ratio of the poly-sulfur to the free sulfur is (3:7)-(7:3). As the modified high-softening point asphalt liquid is added into the drilling fluid disclosed by the invention, and the asphalt granules are prepared in a mode that the base asphalt is coated by a layer of mixture of high-elasticity poly-sulfur and free sulfur, the drilling fluid is small in particle size, has a certain elastic deformation property, is excellent in high temperature resistance and can be stably stored at normal temperature, therefore, the viscosity / yield boosting of the drilling fluid and the dynamic shearing force and the high-temperature high-pressure de-filtration property of the system can be improved.

Description

technical field [0001] The invention relates to a drilling fluid and a preparation method thereof, in particular to a drilling fluid containing modified high-softening point asphalt, and belongs to the technical field of petroleum drilling and production. Background technique [0002] With the development of petroleum exploration and development, the drilling depth continues to deepen, the formations encountered become more and more complex, and the number of special craft wells such as directional wells and horizontal wells is gradually increasing. This makes drilling engineering put forward higher requirements on the performance of drilling fluid, especially the ability to resist high temperature. As an important drilling fluid treatment agent, asphalt products have good comprehensive effects such as anti-slumping, lubrication, reducing fluid loss and high temperature stability. However, the general softening point bitumen cannot meet the high-temperature operation requir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/20C09K8/24
CPCC09K8/206C09K8/24
Inventor 傅丽郭皎河姚汉荣李志军张建峰
Owner CHINA PETROLEUM & CHEM CORP
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