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Strain energy-based method and apparatus to determine the coefficient of resilience of lost circulation materials

A technology of rebound coefficient and plugging materials, applied in the direction of testing material strength, analyzing materials, measuring devices, etc. by applying stable tension/pressure

Inactive Publication Date: 2020-08-18
SAUDI ARABIAN OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In extreme cases, lost circulation problems may force the well to be abandoned

Method used

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  • Strain energy-based method and apparatus to determine the coefficient of resilience of lost circulation materials
  • Strain energy-based method and apparatus to determine the coefficient of resilience of lost circulation materials
  • Strain energy-based method and apparatus to determine the coefficient of resilience of lost circulation materials

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0069] Example 1 (Sample A)

[0070] Sample A was tested at a strain percentage of 20%. Figure 9 A plot 900 of force versus displacement is depicted for the resiliency test of Sample A, showing the determination of the coefficient of restitution of the sample. Such as Figure 9 As shown, the y-axis 902 depicts force and the x-axis 904 depicts the distance moved by the probe. Line 906 in graph 900 corresponds to the force-displacement curve generated during the compression cycle of the test of sample A, and line 908 corresponds to the force-displacement curve generated during the compression cycle of the test of sample A. Shaded area 910 below line 906 represents the absorbed strain energy during the compression cycles of the test. The absorbed strain energy was calculated to be 29.11 kgf-mm. Shaded area 912 below line 908 represents the strain energy released during the decompression cycle of the test. The released strain energy was calculated to be 11.58 kgf-mm.

[007...

example 2

[0072] Example 2 (Sample B)

[0073] Sample B was tested at a strain percentage of 30%. Figure 10 Depicted is a graph 1000 of force versus displacement for the resiliency test of Sample B, showing the determination of the coefficient of restitution of the sample. Such as Figure 10 As shown, the y-axis 1002 depicts force and the x-axis 1004 depicts the distance moved by the probe. Line 1006 in graph 1000 corresponds to the force-displacement curve generated during the compression cycle of the test of Sample B, and line 1008 corresponds to the force-displacement curve generated during the compression cycle of the test of Sample B. As discussed above with respect to Sample A, shaded area 1010 below line 1006 represents strain energy absorbed during the compression cycle of the test, and shaded area 1012 below line 1008 represents strain energy released during the decompression cycle of the test. The absorbed strain energy corresponding to the shaded region 1010 was calculate...

example 3

[0075] Example 3 (Sample C)

[0076] Sample C was tested at a strain percentage of 40%. Figure 11 Depicted is a graph 1100 of force versus displacement for the resiliency test of Sample C, showing the determination of the coefficient of restitution of the sample. Such as Figure 11 As shown, the y-axis 1102 depicts force and the x-axis 1104 depicts the distance moved by the probe. Line 1106 in graph 1100 corresponds to the force-displacement curve generated during the compression cycle of the test of sample C, and line 1108 corresponds to the force-displacement curve generated during the compression cycle of the test of sample C. As discussed above with respect to Samples A and B, the shaded region 1110 below line 1106 represents the strain energy absorbed during the compression cycle of the test, and the shaded region 1112 below line 1108 represents the strain released during the decompression cycle of the test energy. The absorbed strain energy corresponding to shaded r...

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Abstract

A portable resilience testing apparatus for lost circulation materials (LCMs) is provided. The portable resilience testing apparatus includes a test cell and a probe that moves and applies a force toa sample of LCM contained in the test cell. The portable resilience testing apparatus may be used to perform a compression cycle and decompression cycle on the LCM sample. A coefficient of resilienceof the LCM sample is determined from the desorbed strain energy released during the decompression and the absorbed strain energy stored during the compression cycle. A method of determining the coefficient of resilience is also provided.

Description

technical field [0001] The present disclosure generally relates to the testing and evaluation of lost circulation materials (LCMs) for controlling lost circulation in a wellbore during drilling with drilling fluids. More specifically, the disclosed embodiments of the present invention relate to determining rebound behavior or lost circulation material (LCM). Background technique [0002] Lost circulation is one of the common challenges encountered during drilling operations. Lost circulation can be encountered during any phase of operation and occurs when drilling fluid (or drilling mud) pumped into the well returns partially or not to the surface. While some fluid loss is expected, excessive fluid loss is undesirable from a safety, economical or environmental standpoint. Lost circulation is associated with problems associated with well control, wellbore instability, stuck pipe, unsuccessful production testing, poor hydrocarbon production after completion, and formation da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08E21B21/00
CPCE21B43/12G01N11/00G01N2203/0092G01N3/08G01B21/16
Inventor 穆迪·阿马努拉穆罕默德·K·阿尔法吉图尔基·阿尔苏拜
Owner SAUDI ARABIAN OIL CO
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