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公开(公告)号：US20180128094A1
公开(公告)日：2018-05-10
申请号：US15570085
申请日：2016-04-29
Applicant: STATOIL PETROLEUM AS
Inventor： Ioan-Alexandru MERCIU
Abstract: A method of identifying a material and/or condition of a material in a borehole is described, together with related apparatus. The material may either be between first and second tubulars or between a first tubular and a wall of the borehole. The method may include providing a reference quality factor (Qreference) for one or more known materials in one or more known conditions and measuring a downhole quality factor (Qmeasured) of the material and/or material condition to be identified. A spectral ratio α=(Qmeasured/Qreference) may then be computed for one or more known materials under one or more known conditions followed by an analysis of the spectral ratios to identify the material and/or condition of the material in the borehole.
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公开(公告)号：US20160041287A1
公开(公告)日：2016-02-11
申请号：US14776528
申请日：2013-03-15
Applicant: STATOIL PETROLEUM AS
Inventor： Ioan-Alexandru MERCIU
CPC classification number: G01V1/46 , E21B47/0005 , E21B47/091 , E21B47/14
Abstract: An acoustic measurement tool comprises a transmitter for generating acoustic signals and at least one acoustic receiver spaced from the transmitter and configured to receive an acoustic signal, generated by the transmitter, and which has encountered a medium of interest. Moreover, at least one acoustic reference receiver is located adjacent the transmitter and is configured to receive an acoustic signal, generated by the transmitter, prior to the acoustic signal encountering the medium of interest.
Abstract translation: 声学测量工具包括用于产生声学信号的发射器和与发射器间隔开并被配置为接收由发射器产生并且已经遇到感兴趣的介质的声学信号的至少一个声学接收器。 此外，至少一个声学参考接收机位于发射机附近，并被配置为在声学信号遇到感兴趣的介质之前接收由发射机产生的声学信号。
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公开(公告)号：US20170350999A1
公开(公告)日：2017-12-07
申请号：US15539308
申请日：2015-12-21
Applicant: STATOIL PETROLEUM AS
Inventor： Ioan-Alexandru MERCIU
CPC classification number: G01V1/50 , E21B33/14 , E21B47/00 , E21B47/0005 , G01V1/44 , G01V1/48 , G01V2210/1299 , G01V2210/1429
Abstract: A downhole installation comprises: a first pipe layer 8, a second pipe layer 10 about the first pipe layer 8, an annulus 12 between the first pipe layer 8 and the second pipe layer, and a geological formation out-side of the second pipe layer 10. A logging system for evaluation of the downhole installation comprises: a logging tool 4 including an angled acoustic transmitter 20 for exciting a flexural wave in the first pipe layer 8, and three or more 10 angled acoustic receivers 14, 16, 38, 40, 42 spaced apart along the tool 4 such that, in use, the receivers are at different locations along the length of the pipe layers 8, 10, the receivers 4, 16, 38, 40, 42 each being for obtaining third interface echo data from the second pipe layer 10; and a processor arranged to process acoustic data from the receivers in order to: identify trends in the amplitude of the third interface echo as it propagates along the length of 1 the pipes, calculate an estimated exponential decay for the third interface echo when reinforcement from other acoustic energy is disregarded, use this estimation to predict if the material behind the second pipe layer 10 is fluid or solid, and analyse the third interface echo data in light of the determined material state in order to thereby evaluate material conditions in the annulus 12 outside the second pipe layer 10.
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公开(公告)号：US20170350231A1
公开(公告)日：2017-12-07
申请号：US15539299
申请日：2015-12-21
Applicant: STATOIL PETROLEUM AS
Inventor： Ioan-Alexandru MERCIU
Abstract: A downhole installation comprises: a first pipe layer 8, a second pipe layer 10 about the first pipe layer 8, an annulus 12 between the first pipe layer 8 and the second pipe layer, and a geological formation outside of the second pipe layer 10. A method for evaluating the downhole installation comprises: exciting a flexural wave in the first pipe layer 8 using an angled acoustic transmitter 20; receiving third interface echo data using a plurality of angled acoustic receivers 14, 16 at different locations along the longitudinal extent of the pipe layers 8, 10; generating acoustic resonance across the thickness of the first pipe layer 8 and the second pipe layer 10 by use of full waveform excitation; receiving the acoustic response wave field generated by the full waveform; identifying a suitable component of the acoustic response wave field as being representative of the material state behind the second pipe layer 10; determining, based on the amplitude of the identified component and a suitable threshold value, if the material outside the second pipe layer 12 is fluid or solid; and analysing the third interface echo data in light of the determined material state in order to thereby evaluate material conditions in the annulus 12 outside the second pipe layer 10.
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