Well wall crack printing device

A technology for printing devices and fissures, which is used in wellbore/well components, earth-moving drilling, etc., can solve the problems of low resolution, inability to obtain the number and distribution of fissures, and difficulty in determining the development status of fissures and holes, and achieves convenient operation. , the effect of simple structure

Active Publication Date: 2020-10-09
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

In the prior art, the parameters at the time of leakage are used to calculate the amount of leakage and the surface pressure drop, but the number and distribution of fractures cannot be obtained; however, the calculation of wells with successful plugging involves not only the number and distribution of fractures, but also the number and distribution of fractures. It involves the filling quantity of particles of different particle sizes and expansibility under the combined effects of different temperatures and pressures; moreover, the use of imaging logging to determine fractures will be limited by low resolution, and it is difficult to determine the location of fractures and holes. development status

Method used

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specific example

[0059] In a specific example of the present invention, a specific example of a wellbore fracture printing device designed for a wellbore with a diameter of 215.9mm is as follows:

[0060] The inner frame structure 1 is a stainless steel pipe with a length of 2709 mm, such as figure 1 As shown, from left to right are the upper joint 14, the printing mechanism 2, the centralizing ring 13, the printing mechanism 2 and the lower joint 15. in:

[0061] The outer diameter of the left end of the upper joint 14 is 165mm, which is processed with a 5" drill pipe box. The outer diameter of the right end of the upper joint 14 is 210mm, and there are four angles respectively -30°~30°, 60°~120°, 150° ° ~ 210 °, 240 ° ~ 300 ° upper liquid flow tank 143, such as Figure 8As shown, the outer diameter D1 of the upper liquid flow tank 143 is 210 mm, and the inner diameter D2 is 192 mm.

[0062] Such as figure 1 with Figure 8 As shown, the inner diameter d1 of the installation ring groove 1...

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Abstract

The invention provides a well wall crack printing device which comprises an inner frame structure body with a central passage and at least one printing mechanism which can be radially and movably installed in at least one mounting ring groove, wherein the inner frame structure body is provided with at least one mounting ring groove along an axial direction, the printing mechanism comprises at least three mounting brackets arranged in a circumferential direction, and the outer side of each of the mounting brackets is provided with a printing structure layer. According to the well wall crack printing device, cracks and holes of different lithology in a well wall in a formation can be obtained, such as parameters of shape, length, width, number distribution and direction, and the well wall crack printing device has the advantages of simple structure and convenient operation.

Description

technical field [0001] The invention relates to the technical field of oil and gas and geothermal exploration and development, in particular to a well wall fissure printing device. Background technique [0002] In oil and gas wells and mid-deep geothermal wells, the shape, length, width, number distribution and direction of fractures and holes on the well wall of different lithologies in the formation have always been difficult problems that people want to see directly but cannot achieve. , because it is extremely important for the accurate understanding of oil and gas reservoirs and thermal reservoir formations and the choice of development methods. For petroleum and geothermal drilling projects, when drilling wells, a large amount of drilling fluid will be lost due to the existence of rock cracks or holes. When plugging, it is necessary to know a series of parameters of cracks and holes in order to make targeted selections. The gradation of particles in the plugging paddl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 张逸群季璐王琦刘亚宋先知史怀忠王海柱盛茂李敬彬
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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