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

A water-in-oil drilling fluid, oil-water-based technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor suspension ability and high temperature resistance, increased filtration loss, and high oil solubility, Achieve good plugging, reduce high temperature and high pressure filtration loss, and improve high temperature resistance.

Active Publication Date: 2019-03-19
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 overcome the problems of poor high temperature resistance and other problems, the present invention provides a high-performance water-in-oil based drilling fluid to effectively overcome the above defects

Method used

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  • A kind of high-performance water-in-oil base drilling fluid and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0041] Take 30g of oxidized pitch with a softening point of 140.3°C and 70g of coal tar pitch with a softening point of 141.2°C, mix and heat to a molten state. Take 45g of styrene-butadiene rubber powder and preheat at 100°C for 25 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 35 minutes, and cooled to room temperature. Then place it in a freezer to freeze (freezing temperature -30°C, freezing time: 14 hours). After taking it out, put it into a vibrating sieve, and add 7g of cetyltrimethylammonium chloride. Use 80-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.

[0042] First, measure 5# white oil (oil-water ratio 70:30) with a measuring cylinder, put it into a container wi...

Embodiment 2

[0044] Take 50g of oxidized pitch with a softening point of 152.6°C and 50g of coal tar pitch with a softening point of 150.2°C, mix them and heat them to a molten state. Take 38g of nitrile rubber powder and preheat at 95°C for 20 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 30 minutes, and then cooled to room temperature. Then place it in a freezer to freeze (freezing temperature -35°C, freezing time: 10 hours). Put into vibrating sieve after taking out, add 6.2g calcium lignosulfonate. Use a 100-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.

[0045] First, measure 4# white oil (oil-water ratio 75:25) with a measuring cylinder, put it into a container with a stirring de...

Embodiment 3

[0047] Take 40g of oxidized pitch with a softening point of 168.2°C and 60g of coal tar pitch with a softening point of 170.5°C, mix and heat to a molten state. Take 56g of butyl rubber powder and preheat at 110°C for 20 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 155° C. for 30 minutes, and cooled to room temperature. Then place it in a freezer to freeze (freezing temperature -25°C, freezing time: 11 hours). After taking it out, put it into a vibrating sieve, and add 5.8g of sodium lignosulfonate. Use 80-mesh standard sieve as the bottom of the sieve, vibrate and pulverize for 40 seconds, and get the modified high softening point asphalt composition particles under the sieve.

[0048] First, measure 3# white oil (oil-water ratio 65:35) with a measuring cylinder, put it into a container with a stirring device...

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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, a modifier, 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, heat stability and electrical stability of the water-in-oil drilling fluid are substantially improved, so that the drilling liquid can be widely applied to the process of deep oil gas drilling operation.

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 Patents(China)
IPC IPC(8): C09K8/36C09K8/035
Inventor 傅丽郭皎河姚汉荣刘树华张建峰
Owner CHINA PETROLEUM & CHEM CORP
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