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Pressurized dry drilling coring method

A drilling and drilling technology, which is applied to drill bits, drilling equipment, earthwork drilling, etc., can solve the problems of low success rate of coring, damage and change, and achieve the effect of avoiding damage and high success rate of coring

Inactive Publication Date: 2013-06-26
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] In geotechnical engineering and petroleum engineering, the mechanical properties of rock are the most basic data for engineering design. It is often necessary to obtain the mechanical parameters of engineering rock through a large number of mechanical experiments, and the drilling of rock samples is the first step in the whole process, which also affects the experimental data. The first step of data validity leads to a problem: the coring process must contain damage, which has a certain impact on the later parameter measurement. For some hard or high-strength rocks, this effect can be ignored, while for For some weakly cemented, layered or fractured rocks, the success rate of coring is extremely low, and even if a complete core is obtained, the impact of damage on rock properties is also significantly changed

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Embodiment Construction

[0058] In order to better understand the present invention, a preferred embodiment of the structure of the dry core bit with pressure according to the first aspect of the present invention will be described in detail below with reference to the accompanying drawings.

[0059] figure 1 It is a structural schematic diagram of a preferred embodiment of the pressure dry core bit according to the first aspect of the present invention. In this embodiment, the pressure dry core bit includes a drill column 6, a piston A2, a piston B7, and a spring 1. Wherein, the drill column 6 includes two cylinders with different diameters, the spring 1 is embedded in the top of the drill column 6, the upper end of the spring 1 is in contact with the inner surface of the cylinder with a smaller diameter of the drill column 6, and the lower end of the spring 1 is connected with the piston A2, The drill string 6 includes a liquid injection port 4 and a liquid discharge port 3 , the lower end of the pi...

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Abstract

Provided is a pressurized dry drilling coring method. The pressurized dry drilling coring method comprises the following steps: injecting liquid in a drill hydraulic pressure cavity through a liquid injection port; sealing the liquid injection port; pushing a piston B and enabling the piston B to make contact with a rotating joint; pushing the rotating joint to make contact with a rock; pressing a drill towards a rock bedrock direction; and moving the drill to cut the rock. The steps are conducted in sequence. A piston A and a spring form a pressure limiting device, the pressure limiting device ensures that a certain pressure is satisfied inside the hydraulic pressure cavity, and the certain pressure is imposed on the piston B, and then the certain pressure is transmitted to a rock core. The pressurized dry drilling coring method has the advantages of being capable of avoiding damage to the rock core, good in coring integrity, and necessary for extracting site survey data and laboratory research data.

Description

technical field [0001] The invention relates to a method for coring a rock sample in geotechnical engineering, in particular to a coring method using a pressure dry drilling coring bit. Background technique [0002] In geotechnical engineering and petroleum engineering, the mechanical properties of rock are the most basic data for engineering design. It is often necessary to obtain the mechanical parameters of engineering rock through a large number of mechanical experiments, and the drilling of rock samples is the first step in the whole process, which also affects the experimental data. The first step of data validity leads to a problem: the coring process must contain damage, which has a certain impact on the later parameter measurement. For some hard or high-strength rocks, this effect can be ignored, while for For some weakly cemented, layered or fractured rocks, the success rate of coring is extremely low, and even if a complete core is obtained, the impact of damage o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/04
Inventor 张广清
Owner CHINA UNIV OF PETROLEUM (BEIJING)