Drawing method of LWD (logging while drilling) curve

A logging-while-drilling and curve technology is applied in the field of formation feature display and logging-while-drilling curve drawing.

Active Publication Date: 2018-12-07
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

[0004] The object of the present invention is to solve the above-mentioned difficult problems in the prior art, and provide a method for drawing logging-while-drilling curves, so as to overcome the problem that the projected curves are repetitive when the logging trajectory is repeatedly traversed back and forth in the upper and lower formations. However, the characteristics of the formation cannot be distinguished, and the vertical projection method loses its function, so as to guide the drilling personnel to quickly and accurately adjust the dip angle of the drilling trajectory, prevent the target layer from being penetrated, and ensure that the trajectory passes through the target layer

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  • Drawing method of LWD (logging while drilling) curve
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  • Drawing method of LWD (logging while drilling) curve

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Embodiment Construction

[0035] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0036] The invention proposes a method for automatically searching for an inflection point and automatically displaying lanes based on second-order derivatives. In the method, after the model is established, the calculation software can automatically search for the inflection point and display it in lanes automatically, so as to realize the drawing of the logging curve under the condition of drilling.

[0037] The present invention is achieved by adopting the following technical solutions:

[0038] The first step is to select the longitudinal stratigraphic projection section

[0039] Take the line AC connecting the kickoff point A and the bit position C, draw a vertical line through point A, and point B is a point on the vertical line, and then make a plane connecting the line ABC, which is called the longitudinal stratigraphic profile here, marked is ABCD; the prof...

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Abstract

The invention provides a drawing method of an LWD (logging while drilling) curve, and belongs to the field of oil and gas development and exploration. The method comprises the following steps: 1) establishing a longitudinal stratigraphic section; 2) projecting wellbore trajectory data to the longitudinal stratigraphic section; 3) constructing a two-dimensional vertical depth-logging response datapair sequence along a wellbore trajectory; 4) constructing a two-dimensional vertical depth-horizontal displacement pair sequence along the wellbore trajectory; 5) establishing a curve drawing coordinate drawing path, and drawing a first point N0 in the two-dimensional vertical depth-logging response data pair sequence; 6) along the wellbore trajectory, based on M successive points in the two-dimensional vertical depth-horizontal displacement pair sequence after the current drawing point, forming a regression equation through a cubic spline algorithm; 7)carrying out second-order derivation onthe regression equation, then, searching a turning point, and drawing a logging curve in a separate-path manner at the turning point; and 8) end. The method can realize clearer vertical stratigraphiccharacteristic display.

Description

technical field [0001] The invention belongs to the field of oil and gas development and exploration, and in particular relates to a method for drawing logging-while-drilling curves to realize clearer vertical formation feature display. Background technique [0002] Petroleum logging curves are the main means to visually analyze formation lithology, physical properties and fluid properties. Logging data has always been displayed in the form of a curve according to the vertical depth; that is, the position of the wellhead is specified as the zero point, and the vertical depth and the amplitude of the logging physical quantity at a certain depth point are the Cartesian coordinates. The above position, and connect point by point to form the logging curve. In a vertical well, this display method can truly reflect the change of a certain physical parameter of the formation according to the amplitude change of the logging curve. [0003] At present, in the field of drilling expl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/20
CPCG06T11/203
Inventor 王卫倪卫宁
Owner CHINA PETROLEUM & CHEM CORP
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