Research on Overflow Monitoring Mechanism Based on Downhole Microflow Detection

Ge, Liang; Hu, Ze; Chen, Ping; Shi, Lei; Yang, Qing; Liao, Junbi

doi:10.1155/2014/676290

Cited by 4 publications

(3 citation statements)

References 14 publications

(11 reference statements)

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“…When people design the string, in order to increase the effective flow area of drilling fluid in the drill pipe, flat copper wire is used as the cable in the drill pipe and special insulating material is used to wrap the wire into a "sandwich", then put it into the pipe bore [10]. The wire section is shown in Figure 1.…”

Section: Summarization Of Intelligent Drill Stringmentioning

confidence: 99%

Research on Impedance Model of Intelligent Drill String Based on the Average Transformation Theory

Hu¹,

Liang²,

Xiaohui³

et al. 2017

JRST

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Cable transmission has its intrinsic advantages and it is the development tendency of intelligent drilling among all kinds of signal transmission. according to the structure characteristics of the intelligent drill string, this paper analyzes the transmission line distribution parameters of intelligent drill string combined with average transmission theory; transfer matrixes of single drill pipe, drill pipe joint and that of cascaded transmission line between them are all calculated by the transmission line transfer function; impedance model of intelligent drill string communication channel model are built according to that transfer matrix based on the two-port network, then this model is simulated by experiment and the result is analyzed; curve of error rate is got and the influence of different signal-noise ratio, different transmission rate and different transmission distance on signal transmission performance are analyzed. This model simplifies the calculation, and the frequency characteristics and attenuation characteristics of transmission line are obtained under the analog signal and the digital signal, then the average transmission signal characteristics of intelligent drill string is analyzed by intuitive squiggle. Maybe this paper could provide some theoretical guidance for intelligent drill string.

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Section: Summarization Of Intelligent Drill Stringmentioning

confidence: 99%

Research on Impedance Model of Intelligent Drill String Based on the Average Transformation Theory

Hu¹,

Liang²,

Xiaohui³

et al. 2017

JRST

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“…Aiming at the special downhole environment in oil and gas while drilling, the limitation of borehole space to measurement system size, as well as the effect of downhole pressure, temperature, multiphased fluids containing oil and gas bubbles and solid particles plus the variations of downhole fluid domain on measurement, instrument measurement accuracy, and response characteristics, needs comprehensive consideration. In the literature, the researchers proposed different methods and solutions such as acoustics [2][3][4], pressure difference [5,6], and electromagnetics [7,8] for the downhole annular flow measurement while drilling. These methods have achieved some successes but have some problems.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Annular Flow for Drilling Engineering by Electromagnetic Flowmeter Based on Double-Frequency Excitation

Tian

et al. 2019

Journal of Sensors

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Using downhole annular electromagnetic flow measurement to obtain annular flow in real-time is a foundation of microflow control drilling technology. The existing annular flow electromagnetic measurement method based on low-frequency rectangular excitation is affected by slurry interference and formation fluid invasion, which results in large noise generated on the electrode output signal. These noise causes the instability of the flow measurement system output and lower accuracy. Double-frequency rectangular wave excitation has the advantages of excellent zero-point stability attributed to low-frequency rectangular wave excitation and fast response speed with great ability to suppress slurry interference. First, the double-frequency rectangular wave excitation for annular flow electromagnetic measurement is researched, and its corresponding electromagnetic induction signal process is investigated. In order to verify the feasibility of downhole annular electromagnetic flow measurement, a flow verification platform for comparison of standard and detected parameters is established for simulation experiment, and the ability to suppress slurry interference and response speed of the technology in downhole slurry flow measurement are analyzed. The test results show that the downhole annular electromagnetic flow measurement based on double-frequency rectangular wave excitation can not only satisfy the requirements of regular electromagnetic flow measurement but also suppress the annular slurry interference effectively.

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“…J. Wei et al investigated the subsea ultrasonic annular flow measuring system using the principal of time difference and Doppler, and completed some relevant experiments in 2011 [6].However, this kind of annular flow measuring system cannot measure non-Newtonian fluids with large numbers of solid particles. P. Chen developed a downhole annular flow measuring system based on a differential pressure type flow measurement in 2012, and completed a downhole site test [7][8].A downhole differential pressure annular flow measuring system can be widely applied, and as it is almost completely insensitive to fluid properties it can be used in two-phase or multiphase flow. However, due to the chock part in measuring system, it will cause pressure loss and blocking problems in the chock part.…”

Section: Introductionmentioning

confidence: 99%