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1. (WO2018038635) DOWNHOLE ACOUSTIC EMITTER

Pub. No.:    WO/2018/038635    International Application No.:    PCT/RU2017/000301
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Fri May 12 01:59:59 CEST 2017
IPC: E21B 43/25
E21B 28/00
B06B 1/08
Applicants: FEDERALNOE GOSUDARSTVENNOE BUDZHETNOE UCHREZHDENIE NAUKI INSTITUT FIZIKI METALLOV IMENI M.N. MIKHEEVA URALSKOGO OTDELENIYA ROSSIISKOI ACADEMII NAUK (IFM URO RAN)
ФЕДЕРАЛЬНОЕ ГОСУДАРСТВЕННОЕ БЮДЖЕТНОЕ УЧРЕЖДЕНИЕ НАУКИ ИНСТИТУТ ФИЗИКИ МЕТАЛЛОВ ИМЕНИ М.Н. МИХЕЕВА УРАЛЬСКОГО ОТДЕЛЕНИЯ РОССИЙСКОЙ АКАДЕМИИ НАУК (ИФМ УРО РАН)
OBSHCHESTVO S OGRANICHENNOI OTVETSTVENNOSTIU "NPO "PROMRESURS" (OOO "NPO "PROMRESURS")
ОБЩЕСТВО С ОГРАНИЧЕННОЙ ОТВЕТСТВЕННОСТЬЮ "НПО "ПРОМРЕСУРС" (ООО "НПО "ПРОМРЕСУРС")
SERVICIOS Y SUMINISTROS WEAVER DE MEXICO, SA DE CV
СЕРВИСИОС И СУМИНИСТРОС ВИВЕРДЕ МЕХИКО, СА ДЕ СВ
Inventors: TARAKANOV, Valeriy Viktorovich
ТАРАКАНОВ, Валерий Викторович
KUZNETSOV, Mikhail Innokentyevich
КУЗНЕЦОВ, Михаил Иннокентьевич
PATSERKOVSKIY, Roman Petrovich
ПАЦЕРКОВСКИЙ, Роман Петрович
Title: DOWNHOLE ACOUSTIC EMITTER
Abstract:
A downhole acoustic emitter comprises a supporting housing with a cavity and ports, in which housing are disposed a rod-type magnetostrictive transducer with an electrical coil on the rods, and an acoustic waveguide in the form of a cylinder which transitions into a tapering cone. The cylindrical portion of the acoustic waveguide is disposed inside the supporting housing, and the conical portion is disposed outside the housing. The upper end surface of the acoustic waveguide is coaxially joined to the lower emitting surface of the magnetostrictive transducer by soldering, and the acoustic waveguide is joined at its middle portion, which coincides with the zero vibration point of the waveguide, to the supporting housing by a threaded joint. The downhole acoustic emitter is provided with an emitting element, the upper end of which is coaxially joined to the lower end of the acoustic waveguide by a threaded joint. The magnetostrictive transducer has a length of 200-280 mm and is made of permendur, and the ports are arranged around the perimeter of the supporting housing in two rows, the first of which is level with the top turns of the electrical coil of the magnetostrictive transducer, and the second row is level with the bottom turns of the coil. The emitting element is in the form of a cylinder or a prism with a square cross-section.