Hydraulic pressure type coring tool

A hydraulic and coring technology, which is used in the extraction of undisturbed core devices and earthwork drilling, etc., can solve the problems of backward coring tools, adverse effects of geological exploration, and low average coring yield, and achieve the effect of maintaining integrity.

Active Publication Date: 2014-11-19
CCDC PETROLEUM CORING TECH
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  • Abstract
  • Description
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Problems solved by technology

The coring tools used in coring operations for soft and broken strata in the prior art are still relatively b

Method used

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  • Hydraulic pressure type coring tool
  • Hydraulic pressure type coring tool
  • Hydraulic pressure type coring tool

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Embodiment Construction

[0032] Such as figure 1 , figure 2 , image 3 with Figure 4 As shown, a hydraulic pressurized coring tool includes a safety joint 1, a hydraulic pressurization device, an outer cylinder assembly, an inner cylinder assembly 5 and a core claw assembly, wherein the safety joint 1 is hollow at the bottom and top Small conical shape, the middle part of the safety joint 1 is threadedly connected with the outer cylinder assembly, and the lower part is threaded with the hydraulic pressure device; the inner cylinder assembly 5 is suspended below the hydraulic pressure device through the suspension device, and the core claw assembly is arranged on the inner cylinder assembly 5 below; the hydraulic pressure device, the inner cylinder assembly 5 and the core claw assembly are located in the outer cylinder assembly. After the hydraulic pressure is applied by the hydraulic pressure device, the suspension device falls off, and the inner cylinder assembly 5 and the core claw assembly des...

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Abstract

The invention discloses a hydraulic pressure type coring tool which comprises a safe joint, a hydraulic pressurizing device, an outer cylinder assembly, an inner cylinder assembly and a core catcher assembly. The safe joint is of a big-end-up cone shape, the bottom and the top of the safe joint are opened, the middle of the safe joint is connected with the outer cylinder assembly through threads, the lower portion of the safe joint is connected with the hydraulic pressurizing device through threads, the inner cylinder assembly is hung below the hydraulic pressurizing device through a hanging device, the core catcher assembly is arranged on the lower side of the inner cylinder assembly, and the hydraulic pressurizing device, the inner cylinder assembly and the core catcher assembly are located in the outer cylinder assembly. After the hydraulic pressurizing device exerts hydraulic pressure, the hanging device falls off, the inner cylinder assembly and the core catcher assembly fall along with the hanging device, and the core catcher assembly clamps under the action of hydraulic pressure to achieve the aim of completely wrapping a smashing core. When plastic deformation of a core sealing sleeve reaches a certain degree, drilling fluid is discharged from a gap between the core sealing sleeve and a connection sleeve, so that the core can not be compressed excessively, and integrity of the core is guaranteed.

Description

technical field [0001] The invention belongs to the field of drilling and coring, and in particular relates to a hydraulic pressurized coring tool. Background technique [0002] In the coring operation of soft and broken formations, there are mainly the following problems: the low strength of formation cement makes it difficult for the core to form and it is difficult to enter the coring tool. When the core cement has strong water sensitivity, the bearing capacity of the core is reduced under the erosion of water-based drilling fluid, and it is easy to collapse and break, resulting in core plugging and core grinding, thereby affecting the core technical indicators. During the coring process of loosely cemented and heterogeneous pebble-containing glutenite, the vibration of the core drill bit and tools can easily cause the core to break and break. During the core extraction process, due to changes in the stress state of the core column, the core is easily collapsed and broke...

Claims

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Application Information

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IPC IPC(8): E21B25/00
Inventor 胡畔刘彬何超李伟成
Owner CCDC PETROLEUM CORING TECH
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