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Quantitative evaluation method for hydration damage of shale based on acoustic wave velocity test

A technology for shale hydration and sonic wave velocity, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, processing of detected response signals, instruments, etc. The effect of ensuring test accuracy

Active Publication Date: 2021-07-16
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects and deficiencies in the above-mentioned prior art, the present invention provides a method for quantitative evaluation of shale hydration damage based on acoustic wave velocity testing. Quantitative evaluation of hydration damage requires high operational accuracy, complicated operation, and high cost

Method used

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  • Quantitative evaluation method for hydration damage of shale based on acoustic wave velocity test
  • Quantitative evaluation method for hydration damage of shale based on acoustic wave velocity test
  • Quantitative evaluation method for hydration damage of shale based on acoustic wave velocity test

Examples

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Embodiment 1

[0039] A method for quantitative evaluation of mud shale hydration damage based on acoustic wave velocity testing, comprising the following steps:

[0040] Step S10, drilling at least three shale cylindrical rock samples, and putting them into a constant temperature drying oven at 45-60°C to dry for 24 hours, taking them out after drying, measuring the density of the rock samples, and putting them into a drying dish for later use.

[0041] Step S20, using a rock acoustic wave parameter tester to test the longitudinal and shear wave velocities of all shale cylindrical rock samples; screen out at least 3 rock samples with similar longitudinal wave velocities and similar shear wave velocities to form a rock sample group for use in shale Hydration experiment; simultaneously record the mass, longitudinal wave velocity and shear wave velocity of each dry rock sample in the rock sample group, and calculate the initial average mass of the selected rock sample group m 0 , initial avera...

Embodiment 2

[0051] A method for quantitative evaluation of shale hydration damage based on acoustic wave velocity testing, comprising the following steps:

[0052] Step S10. Drill a cylindrical rock sample of mud shale, the size of which is Φ25×50mm, and put it in a constant temperature drying oven at 60°C for 24 hours. The average density of the rock sample is 2.75g / cm when taken out. 3 , and then put it in a desiccator for later use;

[0053] Step S20, using a rock acoustic wave parameter tester to test the longitudinal and transverse wave velocities of all the rock sample mud shale samples, screen out three mud shale samples with similar longitudinal and transverse wave velocities, and test the initial mass and longitudinal and transverse wave velocities of the three dry samples to find Take the initial average mass m 0 , the average longitudinal wave velocity V p0 is 3953m / s, the average shear wave velocity V s0 is 2372m / s, and then calculate the dynamic elastic modulus E of the dr...

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Abstract

The invention discloses a shale cement damage quantitative evaluation method based on an acoustic wave velocity test and relates to the technical field of unconventional oil-gas exploration and development. The method comprises the following steps of drying drilled rock samples, screening out at least three rock samples with similar longitudinal and transverse wave velocities to form a rock sample group, calculating the initial average longitudinal and transverse wave velocity and density of the rock sample group, and calculating an initial dynamic elastic modulus; soaking the rock sample group, taking out the rock sample group every time t, and calculating the water content and the dynamic elastic modulus of the soaked rock sample; calculating a damage variable of the rock sample group; and fitting by adopting a nonlinear fitting method to obtain a shale water content evolution equation and a shale hydration damage evolution equation. According to the method, the influence of rock sample quality change caused by free water invasion on hydration damage is considered, meanwhile, the influence of drilling shaft pressure and shaft temperature is also considered, defects of an existing method are overcome, the shale hydration damage process can be reflected more truly, and the method is simpler, more convenient, more economical and more practical.

Description

technical field [0001] The invention relates to the technical field of unconventional oil and gas exploration and development, in particular to a quantitative evaluation method for shale hydration damage based on acoustic wave velocity testing. Background technique [0002] The mineral composition of shale is rich in clay minerals, and clay minerals usually have strong water sensitivity. During the drilling process, after the drilling fluid filtrate contacts the shale, shale hydration reaction will occur, mainly due to the hydration of water-sensitive clay minerals in the shale, and the hydration of the clay will cause the shale rock to expand Or scattered, which in turn affects the stability of the shale well wall, leading to the collapse and instability of the well wall, which is very easy to cause complex downhole accidents such as drilling sticking and buried drilling, and even leads to the scrapping of the wellbore in severe cases, resulting in huge economic losses. ...

Claims

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Application Information

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IPC IPC(8): G01N29/07G01N29/44
CPCG01N29/07G01N29/44G01N2291/011G01N2291/023
Inventor 范生林马天寿白璟乔李华杨博仲余来洪张千贵陈颖杰
Owner BC P INC CHINA NAT PETROLEUM CORP
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