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Magnesium oxychloride cement paste, preparation method and application thereof in prevention of oil base drilling fluid loss

A technology of magnesium oxychloride cement and oil-based drilling fluid, applied in the directions of drilling compositions, chemical instruments and methods, reagents, etc., can solve problems such as failure to meet the requirements of plugging strength, and achieve the effect of high compressive strength

Pending Publication Date: 2018-11-06
YANGTZE UNIVERSITY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a magnesium oxychloride cement slurry and its preparation method and its application in preventing the loss of oil-based drilling fluid. It has high compressive strength, which solves the problem in the prior art that the cement slurry cannot meet the plugging strength requirements after being polluted by drilling fluid

Method used

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  • Magnesium oxychloride cement paste, preparation method and application thereof in prevention of oil base drilling fluid loss
  • Magnesium oxychloride cement paste, preparation method and application thereof in prevention of oil base drilling fluid loss
  • Magnesium oxychloride cement paste, preparation method and application thereof in prevention of oil base drilling fluid loss

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[0030] The present invention also provides the preparation method of magnesium oxychloride cement slurry described in above-mentioned technical scheme, comprises the following steps:

[0031] (1) Magnesium oxide, fluid loss reducer, dispersant and retarder are mixed to obtain dry powder;

[0032] (2) fresh water and magnesium chloride are mixed to obtain a magnesium chloride solution;

[0033] (3) The dry powder obtained in the step (1) is mixed with the magnesium chloride solution obtained in the step (2) to obtain the magnesium oxychloride cement slurry.

[0034] In the present invention, magnesium oxide, fluid loss reducer, dispersant and retarder are preferably mixed to obtain dry powder.

[0035] In the present invention, there is no special limitation on the mixing method of the magnesium oxide, the fluid loss reducer, the dispersant and the setting retarder, and the mixing method commonly used by those skilled in the art can be adopted.

[0036] The present invention ...

Embodiment 1

[0048] Weigh 56 parts by weight of magnesium oxide, 1 part by weight of water loss reducer, 2 parts by weight of dispersant, and 5 parts by weight of retarder and mix them evenly into dry powder; measure 16 parts by weight of fresh water and weigh 20 parts by weight Mix the magnesium chloride with fresh water to obtain a magnesium chloride solution, stir the magnesium chloride solution at a speed of 4000r / min, after the magnesium chloride is fully dissolved, add the mixed dry powder within 15 seconds, and continue stirring for 35 seconds at a speed of 12000r / min , to obtain the magnesium oxychloride cement slurry used for oil-based drilling fluid plugging according to the present invention.

Embodiment 2

[0050] Weigh 50 parts by weight of magnesium oxide, 1 part by weight of water loss reducer, 1 part by weight of dispersant, and 6 parts by weight of retarder and mix them uniformly to form a dry powder; measure 20 parts by weight of fresh water in a mixing cup, Take by weighing 22 parts by weight of magnesium chloride and mix it with fresh water to obtain a magnesium chloride solution, stir the magnesium chloride solution at a speed of 4500r / min, after the magnesium chloride is fully dissolved, add the mixed dry powder within 10 seconds, cover the stirrer lid, and Stirring is continued for 35 seconds at a rotating speed of 12500r / min, and the magnesium oxychloride cement slurry for oil-based drilling fluid plugging of the present invention is obtained.

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Abstract

The invention provides a magnesium oxychloride cement paste. The magnesium oxychloride cement paste is prepared from the following raw materials in parts by weight: 16 to 25 parts of fresh water, 45 to 60 parts of magnesium oxide, 20 to 30 parts of magnesium chloride, 1 to 3 parts of a fluid loss agent, 1 to 3 parts of a dispersing agent and 3 to 8 parts of a retarder. The magnesium oxychloride cement paste provided by the invention has preferable strength, and can be used for blocking large and medium sized drilling fluid loss. Moreover, the magnesium oxychloride cement paste provided by theinvention also has preferable compressive strength under the invaded pollution of oil base drilling fluids.

Description

technical field [0001] The invention relates to the technical field of oil drilling engineering loss control, in particular to a magnesium oxychloride cement slurry, a preparation method thereof and an application in preventing oil-based drilling fluid loss. Background technique [0002] Compared with water-based drilling fluid, oil-based drilling fluid has the advantages of strong clay hydration inhibition, good lubricating performance, high temperature resistance, stable performance, and easy maintenance. The preferred drilling fluid system for rock formation drilling. At present, in the process of shale gas development in my country, oil-based drilling fluid has been widely used in field operations and achieved good results. However, the leakage of oil-based drilling fluid is also an urgent problem to be solved. Due to the high price of oil-based drilling fluid, once it leaks, it will cause large economic losses. At the same time, repeated leaks will also affect the pro...

Claims

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Application Information

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IPC IPC(8): C04B28/32C09K8/487C04B111/70
CPCC04B28/32C04B2111/00724C04B2111/70C04B2201/20C04B2201/50C09K8/487C04B22/002C04B24/163C04B24/22C04B2103/22Y02P20/141
Inventor 许明标刘卫红王晓亮
Owner YANGTZE UNIVERSITY
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