A method and device for four-probe scattering gamma logging and nonlinear data inversion
A data inversion, non-linear technology, applied in inference methods, surveying, earthwork drilling, etc., can solve problems such as many influencing factors
Inactive Publication Date: 2019-12-17
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
Since there are many factors affecting scattered gamma logging in cased wells, there is no set of effective methods and devices that can simultaneously obtain parameters such as formation density, casing thickness, and cement sheath density. Therefore, it is necessary to study more effective, Inversion method and device for through-casing scattering gamma logging with wider application range
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[0050] The embodiments of the present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the embodiments of the present invention, but not to limit the embodiments of the present invention. In addition, it should be noted that, for ease of description, the drawings only show a part but not all of the structures related to the embodiments of the present invention.
[0051] reference figure 1 , figure 1 It is a schematic flowchart of a method for four-probe scatter gamma logging and data inversion provided by an embodiment of the present invention.
[0052] Such as figure 1 As shown, the four-probe scatter gamma logging and data inversion methods include:
[0053] Step 101: Simulate and calculate the response relationship of the four detectors with the casing, cement ring, and formation, including:
[0054] Obtain the response relationship of the f...
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Abstract
The invention discloses a four-probe scattering gamma logging and nonlinear datum inversion method and device. The method comprises the following steps that response relationships of four probers to a sleeve, a cement sheath and a stratum are obtained; according to the response relationships, a nonlinear forward equation set of measured values of the four probers is established; and the values of the thickness of the sleeve, the density of the cement sheath, the thickness of the cement sheath and the density of the stratum are calculated through an inversion method. According to the four-probe scattering gamma logging and nonlinear datum inversion method and device, the three parameters including the thickness of the sleeve, the density of the cement sheath and the density of the stratum can be accurately obtained under certain conditions, so that density logging and cement bonding evaluation in a cased well can be achieved, and the theoretical basis is provided for developing a scattering gamma logging instrument in the cased well.
Description
Technical field [0001] The embodiment of the present invention relates to the field of logging instrument development and later logging data processing in oil and gas exploration, in particular to a method and device for four-probe scatter gamma logging and nonlinear data inversion. Background technique [0002] As many domestic oil fields enter the later stages of development, in order to stabilize and increase production, it is becoming more and more important to conduct secondary measurements of old formations in cased wells. As a result, the logging method of open hole formation evaluation is gradually applied to cased holes. Cased hole scatter gamma logging can provide formation evaluation parameters for wells with poor borehole stability after casing is run; it can provide porosity measurement data for cased wells without porosity logging data or old wells with data quality problems. On the other hand, when there are micro-rings outside the casing, the traditional acoustic...
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IPC IPC(8): E21B47/00E21B47/005E21B49/00G06N5/04
CPCE21B47/00E21B47/005E21B49/00G06N5/042
Inventor 吴文圣李晓龙曲汉武
Owner CHINA UNIV OF PETROLEUM (BEIJING)