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Airtight coring tool and airtight coring drilling process

A technology of airtight coring and coring bits, which is applied in the direction of extracting undisturbed core devices, earthwork drilling, etc., can solve problems such as core pollution and impact on core quality, increase credibility, improve exploration efficiency and accuracy, shorten The effect of exploration time

Pending Publication Date: 2018-03-20
CCDC PETROLEUM CORING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main purpose of rock cores is to study formations, oil and gas layers and oil source layers. Therefore, drilling and coring is an important way to provide underground original resources, and it is also a direct means to obtain data such as formation lithology and oil content. In order to accurately obtain these underground The original resource information needs to ensure that the obtained core is not polluted. During the drilling and coring process, there will be a certain amount of drilling fluid in the well, which will pollute the core and affect the quality of the core.

Method used

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  • Airtight coring tool and airtight coring drilling process
  • Airtight coring tool and airtight coring drilling process
  • Airtight coring tool and airtight coring drilling process

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: A closed coring tool, including an outer cylinder 1, an inner cylinder 2, a sealing device 3, a core claw assembly 4 and a core bit 5, and the inner cylinder 2 is set in the outer cylinder 1 , the bottom end of the inner cylinder 2 is threaded with the core jaw assembly 4, the bottom end of the outer cylinder 1 is threaded with the core bit 5, and the sealing device 3 is connected with the core The inner wall of the claw assembly 4 is sealed and connected, and the sealing device 3 includes a body 31 and a first sealing ring 32. The top end of the body 31 is located in the inner cylinder 2, and the bottom end is located in the extraction. Outside the core bit 5 , the first seal ring 32 is arranged on the body 31 , and the body 31 is sealingly connected with the inner wall of the core jaw assembly 4 through the first seal ring 32 . At the beginning of coring, the bottom of the sealing device 3 first contacts the bottom of the well, and the rock at the bottom...

Embodiment 2

[0023] Embodiment 2: Preferably, on the basis of Embodiment 1, a notch 33 is provided on the top of the body 31, and a positioning pin 34 is also provided on the body 31, and the body 31 is positioned by The pin 34 is fixedly connected with the core bit 5 . By setting the gap 33, the core sealing fluid can overflow from the gap 33, and when the first sealing ring 32 fails, the sealing fluid can pass through the gap 33, quickly flow out from the inner cylinder 2 and wrap the core. By arranging the positioning pin 34, the first sealing device is fixed on the core bit 5, which enhances the stability of the sealing device 3, and avoids the first sealing device from being unstable from the coring tool when the coring tool is lowered. The middle slides out, causing the first sealing ring 32 to fail early, affecting the coring process. The positioning pin 34 can not only fix the sealing device 3, but also not affect the failure of the first sealing ring 32, because in the coring pro...

Embodiment 3

[0024] Embodiment 3: Preferably, on the basis of Embodiment 1 or 2, a balance piston 6 is arranged on the top of the inner cylinder 2 , and the balance piston 6 is used to seal the inner cylinder 2 . By setting the balance piston 6 on the top of the inner cylinder 2, the top of the inner cylinder 2 is sealed to prevent the core sealing fluid from overflowing from the top of the inner cylinder 2 during the coring process, damaging the coring tool and affecting the coring effect.

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Abstract

The invention discloses an airtight coring tool comprising an outer cylinder, an inner cylinder, a sealed device, a core catcher assembly and a core drilling bit; the inner cylinder is sleeved by theouter cylinder; a bottom end of the inner cylinder is connected with the core catcher assembly in a screwed mode; a bottom of the outer cylinder is connected with the core drilling bit in a screwed mode; the sealed device comprises a body and a first sealing ring; a top end of the body is installed inside the inner cylinder; the bottom end is positioned outside the core drilling bit; the first sealing ring is installed on the body; the body is sealingly connected with an inner wall of the core catcher assembly through the first sealing ring. When the airtight coring tool is used, coring sealing liquid is poured into the inner cylinder, the coring tool is connected to the drilling tool, and the coring tool is drilled downward to recycle drilling fluid and coring tools are released; when the sealing device fails, tree core parameters and coring drilling parameters are set. After the coring stage is completed, the core is cut and the drill is recovered. The airtight coring tool of the present invention can more accurately and comprehensively understand the formation lithology, and increase the credibility of the core analysis and prospecting well reserve prediction.

Description

technical field [0001] The invention belongs to the technical field of drilling and coring, and in particular relates to a closed coring tool and a closed coring drilling process. Background technique [0002] The core is a rock sample that is taken out of the downhole rock through coring tools and other equipment for researchers to study, analyze and test. The main purpose of rock cores is to study formations, oil and gas layers and oil source layers. Therefore, drilling and coring is an important way to provide underground original resources, and it is also a direct means to obtain data such as formation lithology and oil content. In order to accurately obtain these underground The original resource information needs to ensure that the obtained core is not polluted. During the drilling and coring process, there will be a certain amount of drilling fluid in the well, which will pollute the core and affect the quality of the core. Contents of the invention [0003] The ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B25/08
CPCE21B25/08
Inventor 胡畔陈文才李伟成刘彬何超
Owner CCDC PETROLEUM CORING TECH
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