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A device for evaluating the hydration properties of layered hard and brittle shale

A shale hydration and evaluation device technology, which is applied in wellbore/well components, earthwork drilling and production, etc., can solve the problems of inability to truly restore the rock expansion state, micro-cracks swelling with water, etc., and achieve simple and easy-to-understand equipment, Accurate test results and convenient operation

Active Publication Date: 2018-03-27
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the core is crushed, the micro-cracks existing in the original core are destroyed, so this method ignores the expansion of the micro-cracks in the original rock when it encounters water, and cannot truly restore the expansion state of the rock
In particular, there are micro-fractures of graptolite in marine sedimentary shale, the width of which is extremely small and difficult to observe with the naked eye, but these micro-fractures are severely swelled by water.

Method used

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  • A device for evaluating the hydration properties of layered hard and brittle shale
  • A device for evaluating the hydration properties of layered hard and brittle shale
  • A device for evaluating the hydration properties of layered hard and brittle shale

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Effect test

Embodiment 1

[0058] Such as figure 1 As shown, a device for evaluating the hydration characteristics of layered hard and brittle shale includes a base 1 and a sealed base 2, and also includes a high-temperature and high-pressure three-axis servo press system, a pore pressure chemical fluid displacement system, and an acoustic wave testing system. The high temperature and high pressure three-axis servo press system is connected with a pore pressure chemical fluid displacement system and an acoustic wave testing system.

[0059] The high temperature and high pressure triaxial servo press system includes an axial loading device 3 , a loading frame 4 , a triaxial pressure chamber 5 , an upper ram 6 , a lower ram 7 , a confining pressure booster 8 and a confining pressure cylinder 9 . The bottom of the loading frame 4 is provided with a base 1 , the confining pressure cylinder 9 is placed above the base 1 , and the lower end of the confining pressure cylinder 9 is provided with a sealing base 2...

Embodiment 2

[0082] A device for evaluating the hydration characteristics of layered hard and brittle mud shale, its structure, connection relationship between components, working principle, applied evaluation method and beneficial effect are the same as those in Embodiment 1, the difference is:

[0083]In step one, three core samples were drilled. The shape of the core sample is cylindrical and the length is 3 times the diameter. After grinding, the diameter is 25mm and the length is 75mm. The diameter of the core sample is 20 times the diameter of the largest grain in the rock. Two mutually perpendicular diameters are measured at the bottom, middle and upper part of each core sample, and the average value of the measurement results is the final diameter of the core sample.

[0084] In step 2, the method for restoring the core sample to the saturation state of the in-situ pore fluid in the formation is to prepare a potassium chloride solution with the same properties as the pore fluid i...

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Abstract

The invention discloses a device for evaluating the hydration characteristics of layered hard and brittle mud shale, which includes a base and a sealing base, and also includes a high-temperature and high-pressure three-axis servo press system, a pore pressure chemical fluid displacement system and an acoustic wave testing system. system connected. The high temperature and high pressure triaxial servo press system includes an axial loading device, a loading frame, a triaxial pressure chamber, an upper pressing head, a lower pressing head, a confining pressure booster and a confining pressure cylinder. The pore pressure chemical fluid displacement system includes a pore pressure chemical fluid displacement purification device, a pore fluid pipeline I and a pore fluid pipeline II. The acoustic wave testing system includes an acoustic wave probe I and an acoustic wave probe II, the acoustic wave probe I is connected to the upper indenter, and the acoustic wave probe II is connected to the lower indenter. The evaluation device of the invention is simple and easy to understand, convenient to operate, and has accurate test results, can quantitatively evaluate the hydration characteristics of rocks, and provides a device basis for designing a method for evaluating the hydration characteristics of layered hard and brittle mud shale.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling engineering, and relates to an evaluation device for the hydration characteristics of mud shale, in particular to an evaluation device for the hydration characteristics of layered hard and brittle mud shale. Background technique [0002] In recent years, the wellbore stability encountered in layered hard and brittle shale during drilling has always been a major problem in oil and gas drilling engineering. The layered hard and brittle shale has abnormal bedding development and high expansive clay content, which can easily lead to serious wellbore instability during drilling, such as wellbore shrinkage, wellbore collapse, drilling fluid loss and reservoir damage And other issues. Therefore, it is of great economic and social significance to evaluate the hydration characteristics of layered hard and brittle shale. [0003] At present, in the process of evaluating the hydration characte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 卢运虎陈勉董京楠金衍刘铭侯冰杜晓雨
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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