Real-time while-drilling gamma forward modeling geo-steering drilling method

A geosteering and gamma logging technology, applied in directional drilling, special data processing applications, instruments, etc., can solve problems such as slow speed and large amount of calculation

Active Publication Date: 2014-05-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
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Problems solved by technology

[0004] At present, the Monte Carlo method is mostly used for the forward modeling of the gamma ray logging response, but this method has a large amount of calculation and a slow speed, and geosteering drilling requires a timely proposal of the formation model and the adjustment plan of the wellbore trajectory within a limited time, which is also a problem. It is determined that it is difficult to use the Monte Carlo method for fast real-time forward modeling of the gamma-ray logging response while drilling during the geosteering drilling process, so it is necessary to find a real-time gamma-ray forward geosteering drilling method while drilling

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Embodiment Construction

[0055] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0056] figure 1 It is a flow chart when the present invention is used for real-time geosteering drilling. During the actual drilling process, the formation model and wellbore trajectory are updated and adjusted according to this flow chart. The following will be described in conjunction with specific embodiments.

[0057] The specific content of the inventive method comprises:

[0058] In the process of geosteering drilling, based on the pilot formation model and the actual drilling trajectory, the real-time forward simulation of the response of the gamma ray logging while drilling is carried out and compared with the measured gamma ray logging data, and the formation is determined according to the comparison results interface and occurrence, providing a basis for formation model update and wellbore trajectory adjustment. figure 1...

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Abstract

The invention provides a real-time while-drilling gamma forward modeling geo-steering drilling method which includes the steps of in the geo-steering drilling process, based on a pilot stratum model, carrying out real-time forward modeling on while-drilling gamma logging response according to an actually-drilled well track, and carrying out comparative analysis on actually-measured while-drilling gamma logging data to provide the basis for updating the stratum model and adjusting the well track. A while-drilling gamma logging real-time forward modeling computing method based on the stratum model is provided and includes the steps of decomposing the stratum model according to a contact relation between a gamma logging detecting range and a stratum interface, and based on the attenuation law of gamma rays in a stratum, respectively analyzing and computing gamma ray fluxes of areas after the model is decomposed at the positions of detectors. When the real-time while-drilling gamma forward modeling geo-steering drilling method is used for real-time geo-steering, rapid real-time forward modeling can be carried out on a while-drilling gamma logging curve, and therefore the basis is provided for updating the stratum model and adjusting the well track.

Description

technical field [0001] The invention belongs to the field of petroleum exploration and development, and in particular relates to a method for geosteering drilling by using gamma-ray logging while drilling real-time forward modeling simulation. Background technique [0002] During the drilling process of directional wells and horizontal wells, due to factors such as insufficient pre-drilling data or complex geological conditions, the pilot stratum model has certain uncertainties, and it is difficult to accurately judge the stratum boundary and stratum lithology. Therefore, it is usually necessary to use geosteering drilling technology to guide the drilling of horizontal wells: to update the formation model in real time and adjust the well trajectory according to the logging-while-drilling data, thereby reducing drilling risks, increasing the drilling rate of oil layers, and maximizing geosteering The role of technology in drilling. [0003] In the process of geosteering dril...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04G06F17/50
Inventor 邵才瑞曹先军张福明
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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