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Drilling fluid and preparation method thereof

A drilling fluid and particle technology, used in chemical instruments and methods, drilling compositions, etc., can solve the problems of stable dispersion, difficult stable dispersion, and difficult asphalt particles.

Active Publication Date: 2013-05-15
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 problems in the prior art that high softening point asphalt particles are difficult to disperse stably and are easy to rebond after dispersion in the process of applying water-based drilling fluids, the present invention provides a method by adding high softening point asphalt composition particles Drilling fluid, and add appropriate performance modifiers, surfactants, and film-forming additives to make high-softening point asphalt particles uniformly and stably dispersed in drilling fluid
The invention solves the problem that asphalt particles with high softening point are difficult to disperse stably in water-based drilling fluid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The oxidized asphalt with a softening point of 154.0°C accounts for 35% of the base asphalt, and the deasphalt with a softening point of 155.2°C accounts for 65% of the base asphalt, and graphite accounts for 16% of the total material and bentonite accounts for 4% of the total material. , put it into a high-speed pulverizer, mix for 5 seconds, put it in a freezer at a freezing temperature of -25°C, freeze for 8 hours, grind for 25 seconds, add water-soluble acrylic resin accounting for 1.2% of the total amount of materials, and mix for 4 seconds to obtain high softening Point bituminous composition particles with an average particle size of 80 μm.

[0027]According to 2% of the total mass of the drilling fluid, the high softening point asphalt composition particles were placed in 400ml of the prepared drilling fluid base slurry (the base slurry mainly consists of: adding 2.75g of anhydrous sodium carbonate per 1000mL of water, and then adding 60g of calcium bentonite, S...

Embodiment 2

[0032] The oxidized asphalt with a softening point of 168.4°C accounts for 55% of the base asphalt, and the dissolved asphalt with a softening point of 165.9°C accounts for 45% of the base asphalt, and graphite accounts for 12% of the total material and Mongolian material accounts for 6%. Remove the soil, add it to a high-speed pulverizer, mix for 5 seconds, put it in a freezer at a freezing temperature of -30°C, freeze for 6 hours, and pulverize for 20 seconds, add polyvinylpyrrolidone accounting for 1.0% of the total material, and mix for 5 seconds to obtain a high The softening point bituminous composition particles have an average particle size of 62 μm.

[0033] According to 3% of the total mass of drilling fluid, put high softening point asphalt composition particles into 400ml of prepared drilling fluid base slurry, add sulfonated phenolic resin accounting for 16% of asphalt mass, shear at high speed for 15 minutes, and then add Sodium lauryl sulfate with a liquid mass ...

Embodiment 3

[0038] The oxidized asphalt with a softening point of 181.6°C accounts for 70% of the base asphalt, and the dissolved asphalt with a softening point of 180.2°C accounts for 30% of the base asphalt, and graphite accounts for 12% of the total material, and Mongolian material accounts for 4%. Desoiling and bentonite, which accounts for 4% of the total material, are added to a small high-speed pulverizer, mixed for 5s, placed in a freezer at a freezing temperature of -20°C, frozen for 9 hours, crushed for 30s, and 1.5% of the total material is added. Alkyd resin was mixed for another 5 seconds to obtain high softening point asphalt composition particles with an average particle size of 106 μm.

[0039] By 2.5% of the total mass of the drilling fluid, the high softening point asphalt composition particles are placed in 400ml of the prepared drilling fluid base slurry, add sulfonated phenolic resin accounting for 16% of the asphalt composition particle quality, shear at high speed fo...

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Abstract

The invention provides a drilling fluid and a preparation method thereof. The drilling fluid comprises base slurry and additives, wherein the additives include a high-softening point asphalt composition particle, a performance regulator, a stable dispersant and a stable dispersing aid, the addition amount of the high-softening point asphalt composition particle is 2% to 5% of the total mass of the drilling fluid, and the average particle size of the high-softening asphalt composition particle is 10 to 120 mm. The preparation method comprises the following steps: (1) preparing the high-softening point asphalt composition particle; and (2) adding the high-softening point asphalt composition particle into the drilling fluid and then adding proper additives like the performance regulator, a surfactant and a film-forming additive so as to allow the high-softening point asphalt particle to be uniformly and stably dispersed into the drilling fluid. The drilling fluid provided by the invention overcomes the problem that high-softening point asphalt is hard to be crushed into fine particles and has difficulty in stable dispersion in a water-based drilling fluid, and the drilling fluid can be widely used in the process of drilling operation for deep oil and gas.

Description

technical field [0001] The invention relates to a 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] Asphalt products are widely used in oil and gas drilling, and can be used as an important part of drilling fluid (commonly known as mud). It is one of the indispensable important agents for modern drilling projects at home and abroad, and has good comprehensive effects such as anti-slumping, lubrication, reducing fluid loss and high temperature stability. 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 for b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/20
Inventor 傅丽宁爱民郭皎河李明林
Owner CHINA PETROLEUM & CHEM CORP
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