Continuous logging method and device

Patent metadata

Field	Value
Publication number	US-12498307-B2
Application number	US-202318345936-A
Country	US
Kind code	B2
Filing date	Jun 30, 2023
Priority date	Jul 6, 2022
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

A continuous logging method and device is provide, where the method includes obtaining drilling fragment samples and full-diameter core samples, and screening out target rock cuttings from the drilling fragment samples; performing a micro-indentation experiment on the target rock cuttings to obtain a static parameter thereof; performing a triaxial compression experiment on the full-diameter core samples to obtain a dynamic parameter and a static parameter thereof; determining a first correspondence between the static parameter of the target rock cuttings and the dynamic parameter of the full-diameter core samples; determining a second correspondence between logging data and the static parameter of the target rock cuttings based on the first correspondence; and drawing a formation mechanical property profile based on the second correspondence. The method solves the problem of conventional methods which cannot draw a continuous and complete profile of the mechanical property of the whole well section.

First claim

What is claimed is:

1 . A continuous logging method, comprising:
obtaining drilling fragment samples and full-diameter core samples, and screening out target rock cuttings from the drilling fragment samples; performing a micro-indentation experiment on the target rock cuttings to obtain a static parameter thereof, performing a triaxial compression experiment on the full-diameter core samples to obtain a dynamic parameter and a static parameter thereof, and determining a first correspondence between the static parameter of the target rock cuttings and the dynamic parameter of the full-diameter core samples; determining a second correspondence between logging data and the static parameter of the target rock cuttings based on the first correspondence; and drawing a formation mechanical property profile based on the second correspondence.

2 . The method according to claim 1 , wherein the step of obtaining drilling fragment samples comprises:
obtaining drilling fragment samples by sampling at an equal spacing and/or by continuous sampling.

3 . The method according to claim 1 , wherein before screening out the target rock cuttings from the drilling fragment samples, the method further comprises:
performing a whole rock analysis on the drilling fragment samples to obtain a mineral composition thereof, making casting sheets of the drilling fragment samples to obtain a microstructure characteristic thereof, performing a whole rock analysis on the full-diameter core samples to obtain a mineral composition thereof, and making casting sheets of the full-diameter core samples to obtain a microstructure characteristic thereof.

4 . The method according to claim 3 , wherein the step of screening out the target rock cuttings from the drilling fragment samples comprises:
comparing the mineral composition of the drilling fragment samples with the mineral composition of the full-diameter core samples, and the microstructure characteristic of the drilling fragment samples with the microstructure characteristic of the full-diameter core samples, to obtain comparison results; and screening out, based on the comparison results, drilling fragment samples with a mineral composition that differs from the mineral composition of the full-diameter core samples by less than a first preset difference value, and with a microstructure characteristic that differs from the microstructure characteristic of the full-diameter core samples by less than a second preset difference value, from the drilling fragment samples as the target rock cuttings.

5 . The method according to claim 1 , wherein before determining a first correspondence between the static parameter of the target rock cuttings and the dynamic parameter of the full-diameter core samples, the method further comprises:
calibrating the result of the micro-indentation experiment with the result of the triaxial compression experiment to judge whether the result of the micro-indentation experiment is reliable.

6 . The method according to claim 5 , wherein the step of calibrating the result of the micro-indentation experiment with the result of the triaxial compression experiment to judge whether the result of the micro-indentation experiment is reliable comprises:
performing a deconvolution on the result of the micro-indentation experiment to obtain the calibrated static parameter of the target rock cuttings; and comparing the calibrated static parameter of the target rock cuttings with the dynamic parameter of the full-diameter core samples, and determining that the result of the micro-indentation experiment is reliable if a difference value between the calibrated static parameter of the target rock cuttings and the dynamic parameter of the full-diameter core samples is less than a third preset difference value.

7 . The method according to claim 1 , wherein the step of determining a first correspondence between the static parameter of the target rock cuttings and the dynamic parameter of the full-diameter core samples comprises:
determining a third correspondence between the static parameter of the target rock cuttings and the static parameter of the full-diameter core samples; determining a fourth correspondence between the static parameter of the full-diameter core samples and the dynamic parameter of the full-diameter core samples; and determining a first correspondence between the static parameter of the target rock cuttings and the dynamic parameter of the full-diameter core samples based on the third correspondence and the fourth correspondence.

8 . The method according to claim 1 , wherein the step of determining the second correspondence between the logging data and the static parameter of the target rock cuttings based on the first correspondence comprises:
determining a fifth correspondence between the logging data and the dynamic parameter of the full-diameter core samples; and determining a second correspondence between the logging data and the static parameter of the target rock cuttings based on the fifth correspondence and the first correspondence.

9 . The method according to claim 1 , further comprising:
determining, based on the formation mechanical property profile, a distribution of a sweet spot region and a non-sweet spot region of a formation from which the drilling fragment samples and the full-diameter core samples are obtained; determining, based on the formation mechanical property profile, fracturing methods for the sweet spot region and the non-sweet spot region, respectively; fracturing the sweet spot region and the non-sweet spot region for oil recovery, respectively, by using the corresponding fracturing methods.

10 . A computer-readable storage medium storing computer instructions, wherein when executed by a processor, the computer instructions implement the steps of the method according to claim 1 .

11 . A continuous logging device, comprising:
a screening module configured to obtain drilling fragment samples and full-diameter core samples, and screen out target rock cuttings from the drilling fragment samples; an experimental module configured to perform a micro-indentation experiment on the target rock cuttings to obtain a static parameter thereof, perform a triaxial compression experiment on the full-diameter core samples to obtain a dynamic parameter and a static parameter thereof, and determine a first correspondence between the static parameter of the target rock cuttings and the dynamic parameter of the full-diameter core samples; a determination module configured to determine a second correspondence between logging data and the static parameter of the target rock cuttings based on the first correspondence; and a drawing module configured to draw a formation mechanical property profile based on the second correspondence.

12 . The device according to claim 11 , further comprising:
a sweet spot analysis module configured to determine, based on the formation mechanical property profile, a distribution of a sweet spot region and a non-sweet spot region of a formation from which the drilling fragment samples and the full-diameter core samples are obtained, and configured to determine, based on the formation mechanical property profile, fracturing methods for the sweet spot region and the non-sweet spot region, respectively; a fracturing module configured to fracture the sweet spot region and the non-sweet spot region for oil recovery, respectively, by using the corresponding fracturing methods.

Assignees

• Univ China Petroleum Beijing

Inventors

• Zhang Guangqing
• Zhang Min
• Chen Xinran

Classifications

• G01N2203/0286

  Miniature specimen; Testing on microregions of a specimen · CPC title

• G01N2203/0256

  Triaxial, i.e. the forces being applied along three normal axes of the specimen · CPC title

• G01N2203/0078

  using indentation · CPC title

• G01N33/24 Primary

  Earth materials (G01N33/42 takes precedence) · CPC title

• G01N3/08

  by applying steady tensile or compressive forces (G01N3/28 takes precedence) · CPC title