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Flexible Coring Tool

A technology of coring and tools, which is applied in the direction of extracting undisturbed core devices, earthwork drilling and mining, etc., can solve the problems of inability to realize fixed-point and fixed-point coring, unusable, etc.

Active Publication Date: 2018-12-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] All kinds of sealed coring tools for horizontal wells currently used cannot be used in ultra-short-radius horizontal wells or highly-inclined wells with a sidetracking radius of less than 3m, and cannot achieve fixed-point and azimuth coring

Method used

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Embodiment Construction

[0034] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0035] It should be noted that when an element is referred to as being “disposed on” another element, it may be directly on the other element or there may also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening element...

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PUM

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Abstract

The invention discloses a flexible core taking tool, which comprises a core taking drill bit mechanism and a flexible drill rod in sequential connection, wherein a rock core inner barrel is arranged in the flexible drill rod in a penetrating way; the front end of the rock core inner barrel is provided with a hanging mechanism; the front end of the rock core inner barrel is supported in the core taking drill bit mechanism by the hanging mechanism; the back end of the rock core inner barrel is provided with a righting mechanism for righting the rock core inner barrel. The flexible drill rod comprises a first drill rod joint, a second drill rod joint and a plurality of drill rod short sections; the drill rod short sections are positioned between the first drill rod joint and the second drill rod joint and are in head-to-tail connection; the flexible drill rod is connected with the core taking drill bit mechanism through the first drill rod joint.

Description

technical field [0001] The application relates to the field of oilfield exploration and development, in particular to a flexible coring tool. Background technique [0002] Oilfield exploration and development requires accurate acquisition of important geological data such as original oil saturation and formation porosity in order to formulate a reasonable exploration and development plan. In the middle and late stages of oilfield development, it is necessary to check the water injection effect, quantitatively analyze the oil-water dynamics of the reservoir, the situation of the water-flooded reservoir and the effect of water flooding, so as to formulate effective measures to tap potential, increase efficiency and increase production, and improve the development plan. Coring and core analysis, as one of the most direct and important methods to obtain oil and gas data and understand reservoirs, can provide an important basis for the formulation and adjustment of development pl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B25/06
CPCE21B25/06
Inventor 孙强李涛刘合明尔扬张绍林黄守志陈强
Owner PETROCHINA CO LTD