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Method and device for determining distance between bit and formation interface in geosteering while drilling

A stratum interface and geosteering technology, which is used in earth-moving drilling, wellbore/well components, etc., can solve problems such as the inability to quantitatively judge the distance between the drill bit and the stratum interface.

Active Publication Date: 2014-05-14
PETROCHINA CO LTD
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Problems solved by technology

[0004] The embodiment of the present invention provides a method and device for determining the distance between the drill bit and the formation interface in geosteering while drilling, which solves the technical problem that the distance between the drill bit and the formation interface cannot be quantitatively judged in the prior art

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  • Method and device for determining distance between bit and formation interface in geosteering while drilling

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Embodiment Construction

[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0032] In an embodiment of the present invention, a method for determining the distance between the drill bit and the formation interface in geosteering while drilling is provided, such as figure 1 As shown, the method includes:

[0033] Step 101: Obtain azimuth GR logging data in real time while drilling, and predict the relative angle between the formation boundary to be encountered and the drilling direction;

[0034] Step 102: Obtain the vertical distance between the preset position in the drilling direction and the formation interface to be encountered, wherein the preset position is chan...

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Abstract

The invention discloses a method and a device for determining distance between a bit and a formation interface in geosteering while drilling. The method includes the steps of acquiring documents of natural gamma-ray logging in position while-drilling in real time and predicting the relative included angle between the formation interface to be drilled and the drilling direction, acquiring the vertical distance between the preset position in the drilling direction and the formation interface to be drilled, and determining the distance from the bit to the formation interface to be drilled in the drilling direction according to the relative included angle and the vertical distance. The preset position is the position of a detector in the location of the natural gamma-ray curve varies at first when the bit drills to the formation interface to be drilled. According to the documents of the natural gamma-ray logging in position-while-drilling, the distance between the bit and the formation interface to be drilled is quantized, and thus, natural gamma-ray logging in position-while-drilling can facilitate geosteering well.

Description

technical field [0001] The invention relates to the technical fields of geosteering and geological exploration, in particular to a method and a device for determining the distance between a drill bit and a formation interface in geosteering while drilling. Background technique [0002] Geosteering technology is one of the cutting-edge drilling technologies developed in the 1990s. It uses geological or engineering parameters such as natural gamma ray, formation density, formation resistivity, ring pressure, temperature and pressure measured in real time during drilling to determine Adjust the drilling trajectory in time according to the formation encountered by the drill bit. The use of geosteering technology can ensure that the drill bit drills in the favorable reservoir as much as possible to achieve the purpose of increasing production and recovery. With the continuous increase of horizontal wells and directional wells, geosteering is an indispensable high-tech in the dri...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 袁超周灿灿张锋程相志胡松李华阳宋连腾孔强夫高斌
Owner PETROCHINA CO LTD
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