Optimized design method of reducing sonic system sound insulator of acoustic logging-while-drilling drill collar

A design method and optimized technology, applied in surveying, earthmoving, wellbore/well components, etc., can solve the problems of high cost, unfavorable promotion and use of drilling sonic technology, high R&D and processing costs, etc.

Active Publication Date: 2015-04-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the existing sonic while drilling technology adopts grooves on the drill collar for sound insulation. The high cost of well logging is not conducive to the promotion and use of acoustic wave technology while drilling

Method used

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  • Optimized design method of reducing sonic system sound insulator of acoustic logging-while-drilling drill collar
  • Optimized design method of reducing sonic system sound insulator of acoustic logging-while-drilling drill collar
  • Optimized design method of reducing sonic system sound insulator of acoustic logging-while-drilling drill collar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The optimization design method for the sound insulation of the variable diameter acoustic system of the drill collar with a variable diameter while drilling sonic logging, such as figure 1 As shown, including the following steps:

[0065] Step 1. According to the design requirements, determine the best sound insulation stopband frequency range and the inner diameter of the water eye

[0066] Figure 2a Shown are the transmitting sound source transducer T and the receiving transducer R 1 , R 2 , R 3 ,.....R N-1 , R N Schematic diagram of the acoustic system of a change in diameter. The inner diameters of the drill collars from the transmitting sound source transducer T to the receiving transducer are d 1 And P, starting from the sound source transducer T, the reduced diameter lengths are respectively L 1 And L 2 , In the figure, T is the transmitting sound source transducer, the receiving transducer array is N, respectively R 1 , R 2 , R 3 ,.....R N-1 , R N .

[0067] 1. Accord...

Embodiment 2

[0080] The optimization design method for the sound insulation of the secondary variable diameter acoustic logging while drilling drill collar variable diameter acoustic system, such as figure 1 As shown, including the following steps:

[0081] Step 1. Determine the best sound insulation stop band frequency range and the inner diameter of the water eye according to the design requirements.

[0082] Figure 2b Shown is a schematic diagram of the acoustic system of the secondary diameter reduction between the transmitting sound source transducer T and the receiving transducer. The inner diameters of the drill collars from the transmitting sound source transducer T to the receiving transducer array are d respectively 1 , D 2 And P, starting from the sound source transducer T, the reduced diameter lengths are respectively L 1 , L 2 And L 3 , In the figure, T is the transmitting sound source transducer, the receiving transducer array is N, respectively R 1 , R 2 , R 3 ,.....R N-1 , R N . ...

Embodiment 3

[0096] The optimization design method for the sound insulation of the three-time variable diameter acoustic logging while drilling drill collar variable diameter acoustic system, such as figure 1 As shown, including the following steps:

[0097] Step 1. According to the design requirements, determine the best sound insulation stopband frequency range, drill collar wall thickness and inner diameter of the water eye

[0098] Figure 2c Shown is a schematic diagram of the acoustic system of a diameter reduction between the transmitting sound source transducer T and the receiving transducer. The inner diameters of the drill collars from the transmitting sound source transducer T to the receiving transducer are d respectively 1 , D 3 , D 2 And P, starting from the sound source transducer T, the reduced diameter lengths are respectively L 1 , L 2 , L 3 And L 4 , In the figure, T is the transmitting sound source transducer, the receiving transducer array is N, respectively R 1 , R 2 , R 3 ,...

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Abstract

The invention belongs to the field of applied geophysics / acoustic logging and relates to an optimized design method of a reducing sonic system sound insulator of an acoustic logging-while-drilling drill collar. The optimized design method of the reducing sonic system sound insulator of the acoustic logging-while-drilling drill collar comprises the following steps of: step 1, determining an optimal sound insulation resistance band frequency range of the sound insulator and an inner diameter of a water hole according to the design requirement; step 2, establishing a target function of the inner diameter of a reducing position of the drill collar, solving an overall situation minimal value of the target function and determining the optimized inner diameter; and step 3, further adjusting the combination of reducing lengths and establishing a target function; and solving an overall situation minimal value of the target function and determining the optimized combination of the reducing lengths. According to the optimized design method disclosed by the invention, the machining difficulty and cost are reduced and the mechanical strength of the drill collar is enhanced; the problems that a sound insulation effect of an etching groove sound insulator is controlled by a plurality of parameters including a groove width, a groove depth, a groove distance, the quantity of etching grooves and the like, the method only can be designed by experiences and a numerical simulation method and an optimize etching groove structure is difficult to find can be avoided.

Description

Technical field [0001] The invention belongs to the field of applied geophysical / acoustic logging, and specifically relates to an optimized design method for a sound insulation body of a variable-diameter acoustic system of a drill collar while drilling sonic logging. Background technique [0002] The purpose of sonic logging while drilling is to determine the longitudinal and transverse wave velocity of the formation during the drilling process, and provide important information for the exploration and development of oil and gas fields. For example, by combining the measured elastic wave velocity model with seismic exploration data, the position of the formation interface can be determined in real time, and the formation pore pressure can be estimated. Sonic logging while drilling can be used instead of conventional cable sonic logging, and can save a lot of derrick time, which is especially important in deep-sea drilling. [0003] One of the key technologies of sonic logging whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/14E21B49/00
Inventor 苏远大唐晓明庄春喜黑创
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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