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A simulation test device for valve port characteristics of a continuous wave signal generator

A signal generator and simulation test technology, applied in measuring devices, instruments, buildings, etc., can solve the problems of rotary valve erosion, valve port over-flow area limited by space, large power consumption, etc., and achieve a large adjustable range of pressure. , reduce the number of experiments, the effect of strong purpose

Inactive Publication Date: 2018-03-13
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In China, the research types of continuous wave signal generators mainly include rotary valve signal generators and swing rotary valve signal generators. Disadvantages of flow area limited by space

Method used

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  • A simulation test device for valve port characteristics of a continuous wave signal generator
  • A simulation test device for valve port characteristics of a continuous wave signal generator
  • A simulation test device for valve port characteristics of a continuous wave signal generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] (1) Derivation based on the shape of the valve port that generates a continuous wave pressure signal. Parameters maximum and minimum pressure difference ΔPmax, ΔPmin, continuous pressure wave frequency Hz, spool reciprocating motion equation h=g(t), pump flow Q, drilling fluid density ρ, valve port flow coefficient Cd, number of single-layer valve ports n, The number of layers L of the valve port is a preset value, and Matlab is used for simulation calculation to obtain a certain valve port shape such as image 3 . The X-axis direction in the coordinates is the direction of the central axis of the spool, and a complete valve port includes the curve in the figure and a curve symmetrical to the curve about the X-axis;

[0031] (2) Carry out fitting processing according to the valve port shape deduced from the theory, and finally process the processed valve port shape on the pipe wall of the valve seat 05, and expand the valve port on the side of the valve seat pipe wall ...

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Abstract

The invention provides a simulated tester for a valve port characteristic, generating continuous waves, of a signal generator, and relates to a downhole information transmission technology of oil gas drilling, especially to a continuous wave signal generation technology of a drilling fluid. The tester is mainly composed of a flange connecting pipe assembly, a valve port test assembly, a data measuring device and a data collecting device; the valve port test assembly serves as the core body of the tester, and comprises a valve structure and a driving mechanism; the valve structure is mainly comprises a valve core, a valve seat and a central shaft, and ports distributed in multiple rows are formed in cylindrical sidewalls of the valve core and the valve seat; the driving mechanism is mainly composed of a push shaft and a disk seat; and the push shaft is in threaded connection with the disk seat, the push shaft is rotated so that rotation movement of the push shaft is converted into reciprocal movement, and further the central shaft is pushed to drive the valve core to move. The tester can test valve ports of different shapes, a valve port flow coefficient is measured, the characteristic of generating continuous pressure waves of the valve port is verified, and thus, basis is provided for rapid high-efficient downhole information transmission.

Description

technical field [0001] The invention relates to a device for generating a drilling fluid pressure pulse signal in oil and gas measurement while drilling or logging while drilling, especially a device for generating a continuous wave signal of drilling fluid. , Efficient dissemination. Background technique [0002] In the late 1980s, the drilling activities of highly deviated wells, directional wells and horizontal wells were very active, and the measurement-while-drilling technology also began to develop rapidly. Judging from the current application situation, drilling fluid pressure pulse signal transmission is widely used. According to the signal generation mechanism, MWD hydraulic signal generators can be divided into discharge type (negative pulse signal generator) and throttle type (including positive pulse and continuous signal generator) two basic types. However, the transmission rate of the positive pulse and negative pulse transmission methods is low, and there is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D21/02E21B47/20
CPCE21B47/20G01D21/02
Inventor 房军王正旭王宴滨裴科飞
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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