RU2014144565A - Method for determining magnetic azimuth in a downhole inclinometer during drilling - Google Patents
Method for determining magnetic azimuth in a downhole inclinometer during drilling Download PDFInfo
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- RU2014144565A RU2014144565A RU2014144565A RU2014144565A RU2014144565A RU 2014144565 A RU2014144565 A RU 2014144565A RU 2014144565 A RU2014144565 A RU 2014144565A RU 2014144565 A RU2014144565 A RU 2014144565A RU 2014144565 A RU2014144565 A RU 2014144565A
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- inclinometer
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- Geophysics And Detection Of Objects (AREA)
Abstract
1. Способ измерения магнитного азимута в скважинном инклинометре, работающем в условиях воздействия магнитных помех со стороны магнитного окружения буровой колонны, основанный на использовании показаний проекций H, H, hклассической триады феррозондов и двух дополнительных датчиков поля, пространственно разнесенных вдоль продольной оси Z инклинометра, отличающийся тем, что в качестве дополнительных феррозондов используют одноосные с направленными вдоль оси Z осями чувствительности датчики поля, вырабатывающие соответственно текущие значения проекций суммарного поля h=H+Hи h=H+H, где H- проекция поля Земли на ось Z инклинометра, a H, H- напряженности поля помехи, фиксируемые дополнительными датчиками 1 и 2, и затем производят вычисление величин H(1), H(2), H(3), представляющих собой три независимые реализации одного и того же значения проекции H, очищенной от влияния магнитных помех, в соответствии с выражениями H(1)=h-(h-h)/1-К, H(2)=h-(h-h)/1-К, H(3)=h-(h-h)/1-K, где (h-h) характеризует разность показаний первичных измерителей, характеризующих локальный градиент поля между датчиками i и j, а величина K- масштабные коэффициенты, являющиеся постоянными величинами на всем протяжении времени проводки скважины и которые экспериментально определяют на начальном этапе проведения буровых работ, для чего колонну в собранном виде устанавливают в вертикальное положение со значением зенитного угла в диапазоне (0÷15)° и опускают на такую глубину, при которой приращение разности показаний δ(h-h) магнитометров в телесистеме при движении колонны вниз не превышает одной-двух отсчетных единиц, после чего находят коэффициенты в форме выраженийгде- проекция поля Земли на ось Z инклинометра в режиме калибровки;Н- модуль поля Зе1. The method of measuring magnetic azimuth in a borehole inclinometer operating under the influence of magnetic interference from the magnetic environment of the drill string, based on the use of the projections H, H, h of the classical triad of flux gates and two additional field sensors spatially spaced along the longitudinal axis Z of the inclinometer, characterized in that, as additional flux probes, uniaxial field sensors with axes of sensitivity directed along the Z axis are used, which respectively generate current values the projections of the total field h = H + H and h = H + H, where H is the projection of the Earth's field onto the Z axis of the inclinometer, and H, H are the interference field strengths detected by additional sensors 1 and 2, and then the values of H (1 ), H (2), H (3), which are three independent implementations of the same value of the projection H, cleared of the influence of magnetic interference, in accordance with the expressions H (1) = h- (hh) / 1-K, H (2) = h- (hh) / 1-K, H (3) = h- (hh) / 1-K, where (hh) characterizes the difference in the readings of the primary meters, characterizing the local field gradient between the sensors i and j, and the value of K is coefficients that are constant values throughout the time of well drilling and which are experimentally determined at the initial stage of drilling, for which the assembled column is installed in a vertical position with a zenith angle in the range (0 ÷ 15) ° and lowered to such a depth at which the increment of the difference in the readings δ (hh) of the magnetometers in the television system when the column moves down does not exceed one or two reference units, after which the coefficients in the form of expressions are found where the projection of the field Z Earth on the Z axis of the inclinometer in calibration mode; H is the field module Ze
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RU2014144565/03A RU2586341C2 (en) | 2014-11-05 | 2014-11-05 | Method to define magnetic azimuth in well inclinometer in process of drilling |
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RU2014144565/03A RU2586341C2 (en) | 2014-11-05 | 2014-11-05 | Method to define magnetic azimuth in well inclinometer in process of drilling |
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RU2014144565A true RU2014144565A (en) | 2016-05-27 |
RU2586341C2 RU2586341C2 (en) | 2016-06-10 |
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RU2014144565/03A RU2586341C2 (en) | 2014-11-05 | 2014-11-05 | Method to define magnetic azimuth in well inclinometer in process of drilling |
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Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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GB2317454B (en) * | 1996-08-14 | 2001-03-07 | Scient Drilling Int | Method to determine local variations of the earth's magnetic field and location of the source thereof |
CA2484104C (en) * | 2004-10-07 | 2012-08-21 | Scintrex Limited | Method and apparatus for mapping the trajectory in the subsurface of a borehole |
RU2290673C2 (en) * | 2005-03-10 | 2006-12-27 | Федеральное государственное унитарное предприятие Центральный научно-исследовательский институт "Электроприбор" | Method for measuring magnetic azimuth in well inclination meter (variants) and device for realization of method |
RU2291294C1 (en) * | 2005-06-17 | 2007-01-10 | Федеральное государственное унитарное предприятие Центральный научно-исследовательский институт "Электроприбор" | Ferro-probe well tilt meter |
RU2349938C1 (en) * | 2007-07-24 | 2009-03-20 | Общество с ограниченной ответственностью Нефтяная научно-производственная компания "ЭХО" | Method of magnetic azimuth measurement while drilling |
RU2387827C1 (en) * | 2009-01-26 | 2010-04-27 | Общество с ограниченной ответственностью Нефтяная научно-производственная компания "ЭХО" | Method to determine magnetic azimuth in drilling |
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