基于激光传感器的变形套管内部形态三维重构

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关键词：页岩气套管；内变形；自动检测；三维重构；激光测距；三次条样插值；套管检测中图分类号：TE937 文献标识码：A DOI：10.12473/CPM.202410016

Abstract：Shale gas casing may deform under the influence ofengineering and geological factors.Changes in the internal structure of the casing can cause damages such as reduced fluid flow capacity and blockage.The diameterof shale gascasing isusuall around139.7mm，and itis diffcult for general detection equipment to enteror directly detectthe internal deformation process and structural characteristics after deformation.Inthe paper，under experimental conditions，a deformed casing was obtained by simulating the stress situation of the casing，and a non-contact casing internal deformation automatic measurement device based on laser ranging sensor was designed.Then，a circumferential traversal detection method for the internal profileofsmal-sizedcasing that is compatible with the device was proposed to conduct screening on alarge number of sample points obtained from he detection.Finally，the cubic spline interpolation algorithm was used to conduct smoothing processing on the discrete data，thereby reconstructing a clear and intuitive three-dimensional image of the casing interior.The research and testresults show thatthe designed device enables direct internal detection of casing，with convenient replacementof lasersensor toaccommodate internal detectionof differentsizes of pipelines.The ploted 3Dreconstruction image clearlyand intuitivelycharacterizes the internal specific dataand morphology of deformation locations，achieving automatic and precise detection of theradius at any point in thecasing，with adetection accuracy of less than ±0 .1 mm. The conclusions drawn provide reference for the detection of shale gas casing.

Keywords：shalegas casing； internal deformation；automatic detection；3D reconstruction； laser ranging;cubic spline interpolation；casing detection

0 引言

页岩气开采过程中，受固井质量、套管质量、井眼狗腿度等工程因素及岩石力学特性、非均匀地应力、天然裂缝/断层滑移等地质因素的影响，套管易发生变形[1-3]。（剩余10567字）