Rotary-focusing gamma measuring apparatus and method

A technology of gamma measurement and rotational focusing, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve problems such as easy sticking of drilling tools, increased wear resistance of drilling tools, and irregular wellbore trajectory, etc. The effect of increasing speed, increasing limit displacement, and improving trajectory quality

Inactive Publication Date: 2009-07-15
SHENGLI PETROLEUM ADMINISTRATION BUREAU DRILLING TECH ACAD SINOPEC
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Problems solved by technology

However, the disadvantages are: since the drilling tool is in a sliding or stationary state, as the inclination angle of the drilled wellbore and the borehole displacement increase, the friction resistance between the drilling tool and the wellbore wall increases significantly, and the drilling pressure cannot be effectively applied to the drill bit. , the drilling time is slow, the drilling tool is easy to stick, the drilling depth of the wellbore is limited, and the wellbore trajectory drilled by sliding drilling at the same time is irregular

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  • Rotary-focusing gamma measuring apparatus and method

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[0037] Now in conjunction with the accompanying drawings of the description, the present invention will be further described.

[0038] Such as figure 1 , figure 2 As shown, the drill collar (1) is used as the installation skeleton of the gamma ray measuring device and a part of the downhole drilling tool. A group of U-shaped grooves are arranged on the shell surface of the drill collar (1) at intervals of 90 degrees, and wire holes (7) are arranged between the U-shaped grooves. The upper gamma sensor (6) and the lower gamma sensor (12) are respectively installed in U-shaped grooves inlaid with metal shielding layers (5) with a difference of 180 degrees. The borehole attitude measurement sensor (9) is installed in the U-shaped installation groove (8) below the upper gamma sensor installation groove (4), and is aligned with the marking line (2) on the drill collar (1). Microprocessor module (14), power supply module (16), signal short transmission module (18) are installed i...

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Abstract

The invention discloses a rotating focusing gamma measuring device and a method which is used for geosteering in the oil drilling project. The invention comprises a drill collar, a U-shaped installation trough, a shielding layer, a cover, a sealing ring, two gamma sensors, a borehole attitude measurement sensor, a signal short pass module, a microprocessor module, a power module, a data communication port, a drilling fluid diversion channel, a wire hole, a fixing bolt, and a device sign line. The microprocessor module uses the real-time measurement data off the borehole attitude measurement sensor to calculate the position of the sign line, the rotation speed and the angular acceleration of a downhole drilling tool. Comparing the position of the sign line with a set position, the time of opening, measuring and closing the gamma when the drilling tool rotates within a cycle is calculated by the microprocessor by using the rotation speed of the drilling tool, moreover, the gamma value is recorded, the stratum gamma value and the gamma measurement time are accumulated, and the azimuth measuring for the stratum gamma value in rotating drilling is achieved.

Description

Technical field: [0001] The invention relates to a rotating focusing gamma measuring device and method for geosteering in petroleum drilling engineering. Background technique: [0002] At present, in the field of measurement-while-drilling in the drilling industry, the known formation lithology identification method is to determine the formation lithology by measuring the gamma rays emitted by the formation rocks according to the different natural radioactive intensities of different formation lithologies. Natural gamma ray logging methods and instruments have been widely used in wireline logging engineering. In terms of the measurement principle of formation lithology, the measurement-while-drilling method is consistent with the wireline logging method, but there are great differences in the instrument structure, noise processing, signal extraction and technical implementation. The measurement-while-drilling instrument is greatly affected by the drill collar . The natural...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B49/08
Inventor 杨锦舟杨全进肖红兵张海花崔海波
Owner SHENGLI PETROLEUM ADMINISTRATION BUREAU DRILLING TECH ACAD SINOPEC
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