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During-drilling well logging instrument circuit protection device

A circuit protection and logging-while-drilling technology, applied in circuit devices, emergency protection circuit devices, automatic disconnection emergency protection devices, etc. Good versatility and the effect of improving oil logging efficiency

Inactive Publication Date: 2016-11-23
CNPC GREATWALL DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this kind of fuse can only protect once, and it needs to be replaced if it is blown. When replacing the fuse, the construction needs to be interrupted, and the whole string of instruments should be lifted up from the wellhead, which is time-consuming and laborious.
At present, the operating temperature range of most resettable fuses on the market is between -40°C and 85°C, which cannot meet actual needs.

Method used

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  • During-drilling well logging instrument circuit protection device
  • During-drilling well logging instrument circuit protection device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] See figure 1 , figure 2 , the embodiment of the present invention provides a logging-while-drilling instrument circuit protection device, including a housing 1, a circuit board 4, a first joint 2, a second joint 3, and a cover plate 5; The groove 7 of the circuit board 4, the circuit board 4 is set in the groove 7, the first joint 2 and the second joint 3 are respectively set at both ends of the shell 1, and the first Both the joint 2 and the second joint 3 are connected to the circuit board 4, and the circuit board 4 is provided with a current detection module 41, a logic gate circuit 42 and a relay 43, wherein,

[0028] The current detection module 41 is connected to the power supply interface 81 of the downhole petroleum logging instrument 8, and is used to measure the output current of the power supply interface 81 of the downhole petroleum logging instrument 8;

[0029] The relay 43 is connected in the power supply output circuit of the downhole petroleum loggin...

Embodiment 2

[0042] See figure 1 , figure 2, the embodiment of the present invention provides a logging-while-drilling instrument circuit protection device, including a housing 1, a circuit board 4, a first joint 2, a second joint 3, and a cover plate 5; The groove 7 of the circuit board 4, the circuit board 4 is set in the groove 7, the first joint 2 and the second joint 3 are respectively set at both ends of the shell 1, and the first Both the joint 2 and the second joint 3 are connected to the circuit board 4, and the circuit board 4 is provided with a current detection module 41, a logic gate circuit 42 and a relay 43, wherein,

[0043] The current detection module 41 is connected to the power supply interface 81 of the downhole petroleum logging instrument 8, and is used to measure the output current of the power supply interface 81 of the downhole petroleum logging instrument 8;

[0044] The relay 43 is connected in the power supply output circuit of the downhole petroleum logging...

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Abstract

The invention discloses a circuit protection device for a logging-while-drilling instrument, which includes a casing, a circuit board, a first joint, a second joint and a cover plate; a current detection module, a logic gate circuit and a relay are arranged on the circuit board, wherein the current The detection module is used for measuring the output current of the power supply interface of the downhole petroleum well logging instrument; the logic gate circuit is respectively connected with the current detection module and the relay. Through the overcurrent protection device of the present invention, the petroleum logging instrument can disconnect the circuit in time to protect the petroleum logging instrument when the working current of the system suddenly increases during downhole drilling. It will automatically control the relay to resume conduction, so that the circuit can be powered normally, and there is no need to manually replace the fuse, which saves manpower and material costs and greatly improves the efficiency of oil logging.

Description

technical field [0001] The invention relates to the field of petroleum exploration and well logging, in particular to a circuit protection device for logging while drilling. Background technique [0002] LWD (Logging While Drilling) in the petroleum industry generally refers to measuring formation petrophysical parameters during the drilling process, and using the data telemetry system to send the measurement results to the ground in real time for processing. Due to the limitations of current data transmission technology, a large amount of data is stored in the memory of downhole tools and played back after drilling. MWD (Measurement While Drilling) generally refers to the measurement of drilling engineering parameters, such as the measurement of well deviation, azimuth and tool face. Sometimes, MWD refers to all downhole measurements while drilling. [0003] Since the formation parameters obtained by logging while drilling are the formation parameters just drilled, it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08H02H3/06
CPCH02H3/08H02H3/06
Inventor 刘策姜亚竹郝永杰
Owner CNPC GREATWALL DRILLING ENG
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