Method for indoor evaluation of cementing quality of cement-formation interface by using ultrasonic waves

A technology for indoor evaluation and cementation quality, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves. It can solve problems such as complicated operations, and achieve the effect of simple operation and good data repeatability.

Active Publication Date: 2015-02-11
PETROCHINA CO LTD
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Problems solved by technology

[0005] In the existing technology of indoor evaluation of the cementing quality of the cementing interface by mechanical shearing method, since the cementing model of the cementing interface will be destroyed at one time, it cannot be judged that the cementing quality of the cementing interface of the same sample will change with the curing process. The time changes continuously; at the same time, the method is complicated to operate and is not suitable for a large number of experiments in the laboratory

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  • Method for indoor evaluation of cementing quality of cement-formation interface by using ultrasonic waves
  • Method for indoor evaluation of cementing quality of cement-formation interface by using ultrasonic waves
  • Method for indoor evaluation of cementing quality of cement-formation interface by using ultrasonic waves

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preparation example Construction

[0044] During the preparation process of the cementing interface cementation model, parameter values ​​are selected according to the influence of parameters such as core permeability, curing temperature, and curing time on the quality of the cementing interface cementation model. It is a routine choice for technicians when preparing the cementing model of the cementing interface.

[0045] In the embodiment of the present invention, the artificial core is in the shape of a cylinder, and the cementation model of the two cementing interfaces formed is in the shape of a cube.

[0046] Step 103, see image 3 , place the cementing model of the cementing interface between the transmitting transducer and the receiving transducer of the ultrasonic instrument. The present invention uses the acoustic wave method to judge the cementing quality of the cementing interface. Therefore, when using an ultrasonic instrument to detect the first wave amplitude and sound velocity of the cementing ...

example

[0067] This embodiment provides a method for indoor evaluation of the bonding quality of the cementing-two interface by using the ultrasonic method.

[0068] This experimental example can be operated according to the following steps:

[0069] In the first step, five cylindrical artificial cores made of quartz sand are selected. The length of the five artificial cores is 50 mm, the diameter is 25 mm, the porosity is 34%, and the permeability is 0.6 Darcy. Number the 5 artificial cores and mark them as 1 # -5 # .

[0070] In the second step, the 1 selected in the first step # -5 # Cylindrical artificial rock cores are put into five high-temperature and high-pressure filter cake forming devices respectively (see figure 2 ), pour the configured drilling fluid (drilling fluid commonly used in the drilling operation in the experimental example of the present invention) into the surroundings of the above-mentioned 5 artificial rock cores respectively, and prepare 5 artificial r...

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Abstract

The invention discloses a method for indoor evaluation of the cementing quality of a cement-formation interface by using ultrasonic waves, and belongs to the cement-formation interface field. The method is operated according to the following steps: firstly, a cement-formation interface cementing model is bonded with the surfaces of a transmitting transducer and a receiving transducer of an ultrasonic device, then the head wave amplitude and the sound velocity of the cement-formation interface cementing model are measured by the ultrasonic device, finally the head wave amplitude and the sound velocity of the cement-formation interface cementing model are measured according to the method, and thus change conditions of the cementing quality of the cement-formation interface along with the curing time is determined. The method is adopted for indoor evaluation of the cementing quality of the cement-formation interface, damage on a cement-formation interface sample cannot be caused, and the sample can be used repeatedly, so as to realize determination of change conditions of the cementing quality of the cement-formation interface along with the curing time; and in addition, the method is simple to operate, good in data repeatability, and suitable for use when a lot of experiments are performed in a laboratory.

Description

technical field [0001] The invention relates to the field of two cementing interfaces, in particular to a method for evaluating the bonding quality of two cementing interfaces in an ultrasonic chamber. Background technique [0002] Well cementing refers to the operation of running a casing of a certain size into the drilled wellbore and injecting cement slurry into the annular space between the casing and the well wall for sealing. During the cementing process, after injecting cement slurry into the annular space between the casing and the well wall, a cement sheath (stone) will be formed, and the cemented surface between the cement sheath (stone) and the formation (or casing) is the cemented surface. Well 2 interface, the schematic diagram of the model is as follows figure 1 shown. The purpose of cementing is to seal off complex formations such as loose, easy to collapse, and easy to leak; to seal off the oil, gas, and water layers in the annular space outside the casing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 胥志雄李晓春梁红军袁中涛李键郭小阳李早元李明周超程小伟
Owner PETROCHINA CO LTD
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