A kind of water base drilling fluid and preparation method thereof

A water-based drilling fluid and base slurry technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low softening point, complex asphalt process, high cost, improve yield and stability, and improve Conducive to the effect of stable dispersion and simplified production process

Active Publication Date: 2021-03-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] According to the existing technology, the process of preparing high softening point asphalt is complicated and costly, and the asphalt products used in water-based drilling fluids have low softening points and large particles, and their dispersion performance in drilling fluids is not good, so they cannot meet the needs of drilling fluids. For problems such as plugging, anti-collapse, stabilizing the well wall, and reducing fluid loss, the invention provides a water-based drilling fluid and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Heat 250g of residual oil with a softening point of 37.2°C to 120°C in an asphalt reactor, add 21.6g of hexadecyldimethyl tertiary amine and 0.05g of DMP-30 and stir evenly, then add 42.5g of CYD-128 ring epoxy resin, continue to stir for 15 minutes, keep the temperature at 120°C for 6 hours, and cool to obtain epoxy pitch. Epoxy asphalt was added to 350g of water and pulverized with a high shear emulsifier for 30 minutes, then 15.5g of stearylamine polyoxyethylene ether and 0.1g of isopropanol were added to continue mixing for 10 minutes, so that the asphalt particles were evenly dispersed in water; 55g of sulfur powder is placed in a sulfur melting kettle and heated to 140°C, kept for 20 minutes, then enters the reactor, the temperature of the reactor is controlled at 520°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 polym...

Embodiment 2

[0052] Heat 320g of residual oil with a softening point of 44.5°C to 125°C in an asphalt reactor, add 38.4g of cocoyl 1,3-propylenediamine and 0.10g of DDM and stir evenly, then add 70.4g of CYD-128 ring epoxy resin, continue to stir for 18 minutes, keep the temperature at 125°C for 8 hours, and cool to obtain epoxy asphalt. Add epoxy asphalt to 550g water and use a high-shear emulsifier to pulverize for 20 minutes, then add 17.2g fatty alcohol polyoxyethylene ether (AEO-7) and 0.28g diisopropyl xanthate disulfide and continue mixing for 20 minutes Minutes, so that the asphalt particles are uniformly dispersed in water; 100g of sulfur powder is placed in a sulfur melting tank and heated to 140°C, kept for 20 minutes, and then put into the reactor. The temperature of the reactor is controlled at 540°C, and N 2 , keep the pressure 0.9MPa. Maintain this condition for 50 minutes. Then open the discharge valve at the bottom of the reaction kettle, quickly spray the steam containi...

Embodiment 3

[0055] Heat 200g of deasphalt with a softening point of 52.4°C to 140°C in an asphalt reactor, add 30.5g of hydrogenated tallow propylene diamine and 0.06g of DMP-30 and stir evenly, then add 54.2g of E-44 type epoxy resin , continue to stir for 20 minutes, keep the temperature at 130° C. for 7.5 hours, and cool to obtain epoxy pitch. Add epoxy asphalt to 380g water and use a high shear emulsifier to pulverize for 30 minutes, then add 18.2g dodecylamine polyoxyethylene ether and 0.07g 4-chloro-1-butanol and continue mixing for 10 minutes to make the asphalt particles uniform Disperse in water; heat 85g of sulfur powder in a sulfur melting kettle to 130°C, keep it for 20 minutes, and then enter the reaction kettle. The temperature of the reaction kettle is controlled at 560°C, and N 2 , keep the pressure at 1.4MPa. 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 su...

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Abstract

The invention discloses a water-based drilling fluid and a preparation method thereof. The water-based drilling fluid includes base slurry and modified epoxy asphalt fluid. The modified epoxy asphalt fluid includes modified epoxy asphalt particles, water, stable dispersant and stabilizer. The modified epoxy asphalt particles include epoxy asphalt The core formed and the shell formed by the modifier, in terms of parts by mass, the core is 7 to 9 parts, and the shell is 1 to 3 parts; the modifier includes polymerized sulfur and free sulfur, and the polymerized sulfur in the modifier The weight ratio to free sulfur is 3:7~7:3. The modified epoxy asphalt fluid is added to the water-based drilling fluid of the present invention, wherein the asphalt particles are a mixture of high-elastic polymeric sulfur and free sulfur coated with a layer of epoxy asphalt, which not only has a small particle size, but also has a certain Elastic deformation ability, and excellent high temperature resistance. The drilling fluid has good rheological properties and high temperature and high pressure fluid loss reduction effect when used at high temperature.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling and production, and in particular relates to a water-based drilling fluid and a preparation method thereof. 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 requirements in deep wells due to excessive softening or even fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24
CPCC09K8/24
Inventor 傅丽姚汉荣宁爱民郭皎河张建峰刘树华
Owner CHINA PETROLEUM & CHEM CORP
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