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Whole oil-based drilling fluid and preparation method thereof

A drilling fluid, all-oil-based technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high oil solubility, poor suspension ability and high temperature resistance, and increased filtration loss. The effect of improving high temperature resistance, improving rock-carrying ability, 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

[0008] Aiming at the high oil solubility of asphalt particles in the process of applying full oil-based drilling fluid in the existing technology, 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 Problems such as poor high temperature resistance

Method used

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  • Whole oil-based drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take 65g of oxidized pitch with a softening point of 142.5°C and 35g of coal tar pitch with a softening point of 145.6°C, mix and heat to a molten state. Take 75g of styrene-butadiene rubber powder, preheat at 100°C for 40 minutes, add 6.5g of hydrotalcite, put the melted high softening point asphalt in the watering can, and evenly spray the high softening point asphalt on the preheated particles On, turning while spraying. After spraying, it was left to stand at 135° C. for 30 minutes, and then cooled to room temperature. Then place it in a freezer to freeze (freezing temperature -35°C, freezing time: 12 hours). After taking it out, put it into a vibrating sieve, and add 7.8g of cetyltrimethylammonium chloride. Use 80-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.

[0042] Take 90 parts by weight of 5# white oil, add 5 parts by weight of ol...

Embodiment 2

[0044] Take 50g of de-bitumen with a softening point of 156.4°C and 50g of coal tar pitch with a softening point of 153.6°C, mix and heat to a molten state. Take 48g of butyl rubber powder, preheat at 105°C for 30 minutes, add 8g of hydrotalcite, put the melted high softening point asphalt in a watering can, and evenly spray the high softening point asphalt on the preheated particles , turning while spraying. After spraying, it was left to stand at 150° C. for 25 minutes, and cooled to room temperature. Then place it in a freezer to freeze (freezing temperature -30°C, freezing time: 15 hours). Put it into a vibrating sieve after taking it out, and add 8.2g sodium lignosulfonate. 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 92 parts by weight of 3# white oil, add 2 parts by weight of polyoxyethylene laurate, stir at a high ...

Embodiment 3

[0047] Take 40g of oxidized pitch with a softening point of 171.5°C and 60g of coal tar pitch with a softening point of 173.1°C, mix and heat to a molten state. Take 55g of neoprene rubber powder, preheat at 110°C for 25 minutes, add 7.6g of hydrotalcite, put the melted high softening point asphalt in a watering can, and evenly spray the high softening point asphalt on the preheated particles On, turning while spraying. After spraying, it was left to stand at 165° C. for 30 minutes, and cooled to room temperature. Then place it in a freezer to freeze (freezing temperature -25°C, freezing time: 16 hours). Put into vibrating sieve after taking out, 9.3g secondary alcoholic sodium sulfate. Use a 120-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.

[0048] Take 92 parts of 4# white oil, add 3.5 parts of nonylphenol polyoxyethylene ether, stir at room te...

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Abstract

The invention provides whole oil-based drilling fluid and a preparation method thereof. The drilling fluid comprises base oil and an additive, and the additive comprises a performance modifier. The performance modifier contains modified high-softening point asphalt composition particles, and the asphalt composition particles comprise the following components in parts by weight: 50-80 parts of high-softening point asphalt, and 20-50 parts of rubber powder particles; the high-softening point asphalt covers the rubber powder particles, and the softening point is 120-220 DEG C. 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. The drilling fluid can be widely applied to a deep oil gas drilling operation process.

Description

technical field [0001] The invention relates to an all-oil-based drilling fluid and a preparation method thereof, in particular to a drilling fluid containing 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-temperat...

Claims

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Application Information

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