Water-in-oil based drilling fluid with high temperature resistance and preparation method thereof

A technology of water-in-oil drilling fluid and high temperature resistance, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve problems such as poor suspension capacity and high temperature resistance, high oil solubility, and increased fluid loss. , to achieve the effects of improving rock-carrying capacity, improving high-temperature resistance, and reducing high-temperature and high-pressure filtration loss

Active Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the high oil solubility of asphalt particles in the application of water-in-oil drilling fluid in the prior art, the lack of asphalt particles in the drilling fluid system can effectively seal the formation pores and fractures, so that the filtration rate increases, and the suspension capacity and In order to solve the problems such as poor high temperature resistance, the present invention provides a kind of composite particle made of high softening point asphalt and rubber powder into oil-based drilling fluid, and adding appropriate emulsifier to make high softening point asphalt Part of the particles can dissolve into the drilling fluid to enhance adhesion, shear and lubricate, but also maintain a certain particle state in the drilling fluid, which plays a good role in plugging, anti-slumping and fluid loss reduction, and at the same time improves the Rock Carrying Ability of Drilling Fluid

Method used

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  • Water-in-oil based drilling fluid with high temperature resistance and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0041] Take 60g of oxidized pitch with a softening point of 139.6°C and 40g of coal tar pitch with a softening point of 141.2°C, mix and heat to a molten state. Take 70g of neoprene rubber powder and preheat at 110°C for 30 minutes. Put the melted high softening point asphalt in the watering can, evenly spray the high softening point asphalt on the preheated granules, and stir while spraying. After spraying, it was left to stand at 130° C. for 25 minutes, and cooled to room temperature. Then place it in a freezer to freeze (freezing temperature -35°C, freezing time: 14 hours). Put into vibrating sieve after taking out, add 8.5g octadecyltrimethylammonium chloride. Use 80-mesh standard sieve as the bottom of the sieve, vibrate and pulverize for 30 seconds, and get the modified high softening point asphalt composition particles under the sieve.

[0042] Take 5# white oil and calcium chloride aqueous solution (concentration 20%), prepare base liquid according to oil-water volu...

Embodiment 2

[0044] Take 35g of oxidized pitch with a softening point of 154.0°C and 65g of coal tar pitch with a softening point of 152.3°C, mix and heat to a molten state. Take 50g of butyl rubber powder and preheat at 90°C for 40 minutes. Put the melted high softening point asphalt in the watering can, evenly spray the high softening point asphalt on the preheated granules, and stir while spraying. After spraying, it was left to stand at 145° C. for 35 minutes, and then cooled to room temperature. Then place it in a freezer to freeze (freezing temperature -30°C, freezing time: 10 hours). Put into vibrating sieve after taking out, add 6.5g sodium lauryl sulfate. Use a 100-mesh standard sieve as the bottom of the sieve, vibrate and pulverize for 35 seconds, and get the modified high softening point asphalt composition particles under the sieve.

[0045] Take 4# white oil and calcium chloride aqueous solution (concentration 20%), prepare the base liquid according to the volume ratio of ...

Embodiment 3

[0047] Take 50g of oxidized pitch with a softening point of 168.9°C and 50g of coal tar pitch with a softening point of 165.6°C, mix and heat to a molten state. Take 38g of butyl rubber powder and preheat at 100°C for 30 minutes. Put the melted high softening point asphalt in the watering can, evenly spray the high softening point asphalt on the preheated granules, and stir while spraying. After spraying, it was left to stand at 150° C. for 45 minutes, and cooled to room temperature. Then place it in a freezer to freeze (freezing temperature -25°C, freezing time: 16 hours). After taking it out, put it into a vibrating sieve, and add 7.0 g of sodium lignosulfonate. Use a 120-mesh standard sieve as the bottom of the sieve, vibrate and pulverize for 25 seconds, and get the modified high softening point asphalt composition particles under the sieve.

[0048] Take 5# white oil and calcium chloride aqueous solution (concentration 20%), prepare base liquid according to oil-water v...

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Abstract

The invention provides water-in-oil drilling fluid and a preparation method thereof. The drilling fluid comprises an oil phase, a water phase and an additive; the additive comprises high-softening point asphalt composition particles, a promoter, and an emulsifier. Addition of the high-softening point asphalt composition particles is 1-5% of the total mass of the drilling fluid. Average particle size of the high-softening point asphalt composition particles is less than 60 mesh. The drilling fluid solves the problems of plugging and bad leak-off reduction effect, because good particle state and high temperature deformation capability cannot be kept due to extra high oil solubility, when the high-softening point asphalt is applied to oil base drilling fluid. At the same time, when the water content in the water-in-oil drilling fluid is high, the problems that heat stability and electrical stability become bad are solved by means of synergistic effects of the appropriate main emulsifier, the auxiliary emulsifier and the high-softening point asphalt composition particles; the drilling fluid can be widely applied to the deep oil gas drilling operation process.

Description

technical field [0001] The invention relates to a water-in-oil base drilling fluid and a preparation method thereof, in particular to a drilling fluid containing a 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-tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/36
Inventor 傅丽姚汉荣宁爱民刘树华张建峰
Owner CHINA PETROLEUM & CHEM CORP
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