High-temperature resistant water-based drilling fluid and preparation method thereof

A water-based drilling fluid, high temperature resistant technology, applied in drilling fluid and its preparation, drilling fluid field containing high softening point bitumen composition, can solve the problems of difficult dispersion of particles, difficult crushing of bitumen, etc., to reduce high temperature and high pressure filtration loss The effect of increasing the amount of use, increasing the performance, and improving the density

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the existing problems in the prior art that asphalt with a high softening point is not easily crushed and the crushed particles are difficult to stably disperse in water-based drilling fluids, the present invention provides a high-temperature-resistant water-based drilling fluid and a preparation method thereof. In the base drilling fluid, the asphalt particles with high softening point are dispersed evenly and stably, the drilling fluid has strong resistance to high temperature filtration loss, the preparation method is simple, cost-saving, and has a wide range of applications

Method used

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  • High-temperature resistant water-based drilling fluid and preparation method thereof

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Effect test

Embodiment 1

[0030] Add 50g of oxidized asphalt with a softening point of 146.6°C and 50g of deasphalted asphalt with a softening point of 143.3°C into 85g of water, use a high-shear emulsifier to shear for 40 minutes, add 15g of cetyltrimethylammonium chloride, and continue After shearing for 20 minutes, a high softening point asphalt solution (average particle size of asphalt is 96 μm) is obtained.

[0031] Put 24g of high softening point asphalt fluid into 400ml of the prepared drilling fluid base slurry, add carboxymethyl starch accounting for 3% of the drilling fluid mass, and shear at high speed for 15 minutes to obtain a high temperature resistant water-based drilling fluid.

Embodiment 2

[0033] Add 115g of oxidized asphalt with a softening point of 161.6°C to 50g of water, use a high-shear emulsifier to shear for 40 minutes, add 25g of neoprene latex (solid content 30%) and 10g of modified sodium lauryl sulfate, and continue shearing After 25 minutes, high softening point asphalt liquid (average particle size of asphalt 90μm) was obtained.

[0034] Put 20g of high softening point asphalt fluid into 400ml of prepared drilling fluid base slurry, and shear at high speed for 20 minutes to obtain high temperature resistant water base drilling fluid.

Embodiment 3

[0036]Add 90g of oxidized asphalt with a softening point of 153.0°C to 80g of water, use a high-shear emulsifier to shear for 30 minutes, add 16g of styrene-butadiene latex (solid content 40%) and 14g of sodium lignosulfonate and continue to shear for 15 minutes , to obtain high softening point asphalt liquid (average particle size of asphalt 108μm).

[0037] Put 18g of high softening point asphalt fluid into 400ml of the prepared drilling fluid base slurry, add phosphate ester starch accounting for 1.5% of the drilling fluid mass, and shear at high speed for 10 minutes to obtain a high temperature resistant water-based drilling fluid.

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Abstract

The invention discloses a high-temperature resistant water-based drilling fluid and a preparation method thereof. The high-temperature resistant water-based drilling fluid comprises the following components in percentage by mass: 85%-97% of basic mud and 3%-15% of asphaltic liquid of a high softening point. The preparation method comprises the following steps: (1), adding asphaltic raw materials of a high softening point into water for performing crushing, adding a stable dispersant, and uniformly mixing the crushed asphaltic raw materials and the stable dispersant so as to obtain the asphaltic liquid of the high softening point; (2),uniformly mixing the asphaltic liquid of the high softening point, a performance modifying agent and the basic mud so as to obtain the high-temperature resistant water-based drilling fluid. In the water-based drilling fluid disclosed by the invention, the dispersion of asphaltic particles of a high softening point is uniform and stable; the water-based drilling liquid is high in high temperature resistance and filtration resistance; the preparation method is simple and convenient, the cost is reduced, and the applied range is wide.

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] 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 on the performance of drilling fluid, especially the ability to resist high temperature. As an important drilling fluid treatment agent, asphalt products have good comprehensive effects such as anti-slumping, lubrication, reducing fluid loss and high temperature stability. However, the general softening point bitumen cannot meet the high-temperature operation r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/20
CPCC09K8/20C09K8/22
Inventor 傅丽姚汉荣郭皎河张建峰刘树华
Owner CHINA PETROLEUM & CHEM CORP
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