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Method of transmitting down order for well drilling and its system

A technology for drilling and downhole tools, which is applied to the automatic control system of drilling, drilling equipment, earthwork drilling and production, etc. It can solve the problems of low receiving sensitivity and fault tolerance, complex system structure, and narrow application range, etc., and achieves wide application range, The effect of accurate measurement signal and low installation requirements

Inactive Publication Date: 2007-04-18
XI'AN PETROLEUM UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a method and system for transmitting downlink commands for drilling, so as to effectively solve the problems existing in the prior art such as narrow adaptability, low receiving sensitivity and fault tolerance, high installation requirements and complex system structure

Method used

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  • Method of transmitting down order for well drilling and its system
  • Method of transmitting down order for well drilling and its system
  • Method of transmitting down order for well drilling and its system

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1, a method for transmitting downhole commands for drilling, is to use the acceleration sensor installed near the downhole drill bit to sense the change of drilling fluid displacement at the wellhead, and encode the change to transmit a control signal to the downhole tool. The specific method is: when the drilling fluid, such as mud, circulates (by controlling the bypass valve on the standpipe to control the displacement of the ground mud or directly switching the pump), the water eye of the drill bit connected to the drill string generates corresponding vibrations, and the acceleration sensor receives Vibration information, for the decoder, define the input as logic "1" at this time; when the mud circulation stops or has a smaller displacement than the pump, the acceleration sensor is not sensitive to vibration information, for the decoder, At this time, the input is defined as logic "0"; encoding "1" and "0" conveys different information.

[0027] Referring...

Embodiment 2

[0051] Embodiment 2, a method for transmitting downlink commands for drilling, is to use the acceleration sensor installed near the downhole drill bit to sense the vibration change caused by the rock breaking energy of the drill bit, and transmit the control signal to the downhole tool after encoding the change method. The specific method is: use the drill string to drill to generate vibration. When the drill string is drilling, the vibration energy caused by the drill bit breaking the rock is very large, while the ground stops, the drill string is in a static state, and the vibration energy in the downhole is the smallest. Utilize the vibration energy difference caused by the rotation of the drill string and the static downhole to determine the code of the source, thus forming the instruction information. When the drill bit breaks the rock, the acceleration sensor receives the vibration information. For the decoder, the input is defined as Logic "1"; when the drill string is ...

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Abstract

This invention relates to information transmission channel equipment technology from ground to underground in underground closed loop guide intelligent borehole system, specifically relates to a kind of method and system for borehole that delivering down order. The existing technology is in narrow scope, its incept sensitivity and fault tolerant is low, the demand of installation is high and system structure is complex. To overcome the shortcomings of existing technology, the invention provides a kind of method for borehole that delivering down order. It is a kind of signal transmission and control method that uses the sensitivity libration change of the acceleration sensor which is set around the aiguilles in the down-hole, and coding this change to the tools in the down-hole. The invention also provides a kind of system for borehole that delivering down order, includes the sensors and decoding identification module set in the drill collar, its characteristic is: it includes signal adjustment module, the said sensor is acceleration sensor.

Description

Technical field: [0001] The invention relates to the technical field of information transmission channel equipment from the ground to the downhole in an downhole closed-loop rotary steerable intelligent drilling system, in particular to a method and system for transmitting downlink commands for drilling. Background technique: [0002] In recent years, petroleum downhole equipment gradually reflects the trend of intelligence and automation, and this trend is still in the process of vigorous development. For example, intelligent drilling steering system, downhole intelligent water injection control system, etc. The common feature of these systems is that the measurement and control are all completed in the downhole by an intelligent actuator controlled by a microcomputer, and at the same time, the ground can also be remotely controlled. As a means of realizing remote control, the data transmission method from the surface to the underground is also one of the hot research issue...

Claims

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Application Information

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IPC IPC(8): E21B47/12E21B44/00
Inventor 傅鑫生周静尚海燕傅刚刘惠恩雷诚傅杰姜伟蒋世全
Owner XI'AN PETROLEUM UNIVERSITY
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