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Full oil base drilling fluid and preparation method thereof

A drilling fluid and all-oil-based technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of shortage, increased fluid loss, high oil solubility, etc., to improve the performance, simplify the production process, The effect of increasing the yield

Active Publication Date: 2020-11-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the high oil solubility of asphalt particles in the process of applying full oil-based drilling fluid in the prior art, the lack of asphalt particles in the drilling fluid system can effectively block the formation pores and fractures, so that the filtration rate increases, and the suspension capacity and anti-corrosion In order to solve problems such as poor high temperature capability, the present invention intends to provide a modified high softening point asphalt particle, which is applied in oil-based drilling fluid, and has a certain high temperature resistance and a certain high temperature deformability, which plays a very good role. Excellent plugging, anti-slump and fluid loss reduction effects, while improving the rock-carrying ability of drilling fluid

Method used

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  • Full oil base drilling fluid and preparation method thereof

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Effect test

Embodiment 1

[0041] Put 120g of sulfur powder in a closed reaction kettle, heat it to 285°C, add 0.12g of 1-tetradecene after 40 minutes, and feed N at the same time 2 Keep the pressure at 1.0MPa. Heat 380g of asphalt with a softening point of 135.4°C in a closed raw material tank to a molten state, and pass N 2 Keep the pressure of the raw material tank at 0.8MPa, and react for 60 minutes. After the sulfur in the reactor melts and polymerizes, open the valves of the reactor and the asphalt raw material tank at the same time, spray the two liquids into the contact tower, and the molten sulfur enters from the upper part of the tower. , The molten bitumen enters from the lower part of the tower, so that the two are fully contacted in countercurrent and kept for 30 minutes. Open the discharge valve at the bottom of the contact tower, quickly spray the liquid into the quenching liquid containing 0.18g 6-chloro-1-hexanol for rapid cooling, and form uniform particles of asphalt and high-elastic...

Embodiment 2

[0044] Put 90g of sulfur powder in a closed reaction kettle, heat it to 295°C, add 0.18g of isoprene after 50 minutes, and feed N 2 Keep the pressure at 1.4MPa. Heat 410g of asphalt with a softening point of 147.6°C in a closed raw material tank to a molten state, and pass N 2 Keep the pressure of the raw material tank at 0.8MPa, and react for 55 minutes. After the sulfur in the reactor melts and polymerizes, open the valves of the reactor and the asphalt raw material tank at the same time, spray the two liquids into the contact tower, and the molten sulfur enters from the upper part of the tower. , The molten bitumen enters from the lower part of the tower, so that the two are fully contacted in countercurrent and kept for 40 minutes. Open the discharge valve at the bottom of the contact tower, quickly spray the liquid into the quenching liquid containing 0.16g of isopropanol for rapid cooling, and form uniform particles of asphalt and high elastic sulfur, which are suspende...

Embodiment 3

[0047] Put 160g of sulfur powder in a closed reaction kettle, heat it to 320°C, add 0.25g of 1-octadecene after 55 minutes, and feed N at the same time 2 Keep the pressure at 1.2MPa. Heat 340g of asphalt with a softening point of 158.4°C in a closed raw material tank to a molten state, and pass N 2 Keep the pressure of the raw material tank at 1.0MPa, and react for 90 minutes. After the sulfur in the reactor is melted and polymerized, open the valves of the reactor and the asphalt raw material tank at the same time, spray the two liquids into the contact tower, and the molten sulfur enters from the upper part of the tower. , The molten bitumen enters from the lower part of the tower, so that the two are fully contacted in countercurrent and kept for 50 minutes. Open the discharge valve at the bottom of the contact tower, quickly spray the liquid into the quenching liquid containing 0.20g of 4-chloro-1-butanol for rapid cooling, and form uniform particles of asphalt and high e...

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Abstract

The invention provides an all-oil based drilling fluid. The all-oil based drilling fluid comprises 90 to 95 parts of base oil, 1 to 3 parts of organic soil, 1 to 5 parts of an emulsifier and 1 to 6 parts of a performance regulator, wherein the performance regulator is a modified high-softening-point asphalt particle which comprises 7 to 9 parts of a core composed of base asphalt and 1 to 3 parts of a shell formed by a modifying agent in parts by mass; the modifying agent comprises polymeric sulfur and free sulfur with a weight ratio of 3: 7 to 7: 3; the asphalt particle is obtained through thefollowing steps: respectively spraying melted base asphalt and melted sulfur from the upper and lower ends of a reaction tower, carrying out countercurrent contact, spraying a product into a quenching liquid, and carrying out quenching; and the drilling fluid is obtained by mixing the above-mentioned components. The drilling fluid provided by the invention employs the high-softening-point asphaltparticle as a regulator, and the high-softening-point asphalt particle can remain good particular state and high-temperature deformability in the all-oil based drilling fluid, so the effects of plugging and filtration reduction are improved.

Description

technical field [0001] The invention relates to an all-oil-based 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 wat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/32C09K8/035
CPCC09K8/035C09K8/32C09K2208/12
Inventor 傅丽姚汉荣郭皎河宁爱民刘树华
Owner CHINA PETROLEUM & CHEM CORP
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