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Hydraulic automatic sealing joint of through-casing resistivity logging tool

A technology of resistivity logging and sealing joints, which is applied in the direction of pipes/pipe joints/fittings, passing components, wellbore/well parts, etc., which can solve the problems of loss of hydraulic oil, inconvenient cleaning and maintenance of logging tools, environmental pollution, etc. , to achieve the effect of reducing workload, avoiding a large amount of loss and reducing pollution

Active Publication Date: 2017-09-12
CNPC GREATWALL DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This situation will not only lose the hydraulic oil, but also easily cause environmental pollution, and it is inconvenient to clean and maintain the logging tool

Method used

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  • Hydraulic automatic sealing joint of through-casing resistivity logging tool

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Embodiment Construction

[0016] figure 1 It is a schematic cross-sectional view of a hydraulic automatic sealing joint of a through-casing resistivity logging tool according to a preferred embodiment of the present invention. A section of spring 6 is arranged in the hydraulic sealing chamber 3 of the tail part 10 of the hydraulic section. Preferably, the central axis of the spring 6 coincides with the central axis of the male joint 5 of the sealing joint of the upper power supply head 20 .

[0017] At the end of the spring 6 is provided a sealing ball 4 which can move along the longitudinal central axis of the sealing joint as the spring 6 expands and contracts. The sealing ball 4 is generally preferably a steel ball, preferably having a diameter of about 9 mm.

[0018] When the hydraulic control system on the logging tool is working normally, the upper power supply head 20 is connected to the tail part 10 of the hydraulic section, and the male joint 5 of the sealing joint of the upper power supply ...

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Abstract

The invention discloses an automatic seal joint for hydraulic pressure of a through casing resistivity logging unit. The automatic seal joint comprises an upper power supply head and a hydraulic section tail, wherein a spring is arranged in a hydraulic seal chamber of the hydraulic section tail; a ball sealer is arranged on the tail end of the spring; when the upper power supply head is connected with the hydraulic section tail, a male joint of the seal joint of the upper power supply head penetrates through an outlet of the hydraulic seal chamber and stretches into the hydraulic seal chamber, and the ball sealer is jacked; when the hydraulic section tail is detached from the upper power supply head, the male joint of the seal joint of the upper power supply head is withdrawn from the hydraulic seal chamber, the ball sealer is jacked to the outlet of the hydraulic seal chamber by the spring, and the outlet is sealed. The automatic seal joint is simple in structure, the massive loss of hydraulic oil is effectively avoided in the logging unit detachment process, the pollution to the environment caused by the hydraulic oil is reduced, and the workload of instrument maintenance is reduced.

Description

technical field [0001] The invention relates to petroleum testing technology, and more particularly relates to a hydraulic automatic sealing joint of a through-casing resistivity logging instrument. Background technique [0002] The through-casing resistivity logging tool is a tool for measuring the formation resistivity behind the casing. When the electrode of the logging tool is pushed against the casing wall, the electrode energizes the casing. Since the casing and formation are conductors, the potential can be detected elsewhere on the casing wall. The current is mainly in the casing, and only a small part flows into the formation. The amount of current entering the formation is determined by the conductivity of the formation. Since the potential difference of the leakage current from the casing is proportional to the conductivity of the formation, the resistivity distribution of the cased well can be obtained by measuring the potential difference of the leakage curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L29/02E21B49/00
CPCE21B49/00F16L29/02
Inventor 赵宝成陈小安关振显惠冲李进强陆宁刘轶
Owner CNPC GREATWALL DRILLING ENG