Water-in-oil drilling fluid and preparation method thereof

A water-in-oil based drilling fluid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor suspension capacity and high temperature resistance, increased filtration loss, high oil solubility, etc., to achieve The effect of improving performance, simplifying production process and increasing yield

Active Publication Date: 2020-08-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the high oil solubility of bitumen particles in the process of applying water-in-oil based drilling fluid in the prior art, the lack of bitumen 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 In order to solve the problems such as poor high temperature resistance, the present invention intends to provide a modified high softening point asphalt particle, which is applied to oil-based drilling fluid. Good plugging, anti-slump and fluid loss reduction effects, while improving the rock-carrying ability of drilling fluid

Method used

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  • Water-in-oil drilling fluid and preparation method thereof

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Effect test

Embodiment 1

[0045] Heat 380g of asphalt with a softening point of 125.6°C to 165°C in an asphalt reactor, add 11.5g of maleic anhydride, and feed inert gas to keep the pressure of the asphalt reactor at 0.45MPa, and react for 3.5 hours to obtain grafted Activate asphalt; put 90g of sulfur powder in a closed sulfur reactor, heat to 290°C, add 0.09g of isoprene after 40 minutes, and feed N at the same time 2 Keep the pressure at 1.2MPa. After the asphalt grafting reaction is completed, open the valve of the reaction kettle at the same time, spray the two liquids into the contact tower, the molten sulfur enters from the upper part of the tower, and the molten asphalt enters from the lower part of the tower, so that the two can fully contact in countercurrent and keep 30 minute. Open the discharge valve at the bottom of the contact tower, quickly spray the liquid into cold water for quenching, and form uniform particles of asphalt and high elastic sulfur, which are suspended in the quenching...

Embodiment 2

[0048] Heat 400g of asphalt with a softening point of 135.5°C to 170°C in an asphalt reactor, add 16.5g of polyoxalic anhydride, and pass inert gas to keep the pressure of the asphalt reactor at 0.6MPa, and react for 4.5 hours to obtain graft activation Asphalt; put 80g of sulfur powder in a closed sulfur reactor, heat to 300°C, add 0.1g of 1-dodecene after 50 minutes, and feed N 2 Keep the pressure at 1.5MPa. After the asphalt grafting reaction is completed, open the valve of the reaction kettle at the same time, spray the two liquids into the contact tower, the molten sulfur enters from the upper part of the tower, and the molten asphalt enters from the lower part of the tower, so that the two can fully contact in countercurrent and keep 40 minute. Open the discharge valve at the bottom of the contact tower, quickly spray the liquid into cold water for quenching, and form uniform particles of asphalt and high elastic sulfur, which are suspended in the quenching liquid. Kee...

Embodiment 3

[0051] Heat 425g of asphalt with a softening point of 145.4°C to 185°C in an asphalt reactor, add 15.2g of polyisobutylene succinic anhydride, and feed inert gas to keep the pressure of the asphalt reactor at 0.9MPa, and react for 5.5 hours to obtain grafted Activate asphalt; put 120g of sulfur powder in a closed sulfur reaction kettle, heat to 320°C, add 0.24g of hexachloro-p-xylene after 55 minutes, and feed N 2 Keep the pressure at 1.2MPa. After the asphalt grafting reaction is completed, open the valve of the reaction kettle at the same time, spray the two liquids into the contact tower, the molten sulfur enters from the upper part of the tower, and the molten asphalt enters from the lower part of the tower, so that the two can fully contact in countercurrent and keep 45 minute. Open the discharge valve at the bottom of the contact tower, quickly spray the liquid into cold water for quenching, and form uniform particles of asphalt and high elastic sulfur, which are suspen...

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Abstract

The invention provides a water-in-oil based drilling fluid. The water-in-oil based drilling fluid comprises 0.5 to 5% of a main emulsifier, 0.1 to 3% of an auxiliary emulsifier, 1 to 3% of organic soil and 1 to 5% of a performance regulator, with the balance being base oil and water, wherein the performance regulator is a modified high-softening-point asphalt particle which comprises a core composed of grafted activated asphalt and a shell formed by a modifying agent; the asphalt particle is obtained through the following steps: respectively spraying melted grafted activated asphalt and meltedsulfur from the upper and lower ends of a reaction tower, carrying out countercurrent contact, spraying a product into a quenching liquid, and carrying out quenching; and the drilling fluid is obtained by mixing the above-mentioned components. The drilling fluid provided by the invention employs the high-softening-point asphalt particle as a regulator, and the high-softening-point asphalt particle can remain good particular state and high-temperature deformability in the water-in-oil based drilling fluid, so the effects of plugging and filtration reduction are improved.

Description

technical field [0001] The invention relates to a water-in-oil drilling fluid, in particular to a drilling fluid containing a modified 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-temperature deep wells and water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/36C09K8/035C09K8/467C09K8/508C09K8/514
CPCC09K8/035C09K8/36C09K8/426C09K8/467C09K8/508C09K8/514C09K8/90
Inventor 傅丽郭皎河姚汉荣刘树华张建锋
Owner CHINA PETROLEUM & CHEM CORP
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