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Detection method and device for forecasting formation interface position in real time by in-well while drilling radar

A technology of formation interface and detection device, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve the problems of unrecognizable interface, limitation of real-time imaging function of radar in the well, and limitation of real-time imaging, etc., and achieve the effect of convenient operation

Inactive Publication Date: 2017-12-01
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the radar in the well uses a galvanic source in the same direction as the drilling, so it can only detect the non-orthogonal interface beside the well, but cannot identify the interface orthogonal to the well, which undoubtedly limits its real-time imaging function fundamentally
In addition, the effects of drill bits, cables and other metals cause many inclined events on the radar profile. These events are very strong and cover the effective events of the formation interface. Current scholars regard them as noise and filter them out, or Improving instrument materials to compensate for the influence of this abnormal event, which also severely limits the real-time imaging function of the radar in the well

Method used

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  • Detection method and device for forecasting formation interface position in real time by in-well while drilling radar
  • Detection method and device for forecasting formation interface position in real time by in-well while drilling radar
  • Detection method and device for forecasting formation interface position in real time by in-well while drilling radar

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Effect test

Embodiment 1

[0032] Such as Figure 1-8 As shown, the detection method and device for real-time prediction of the formation interface position by radar while drilling in the well include a metal rod 1 connected to a drill bit 3 at one end, and a radar instrument 2 in the well is connected to the other end of the metal rod 1. The metal rod 1 is of a solid structure or Hollow structure; when the solid structure is selected, the stability of the whole device is enhanced; the whole device is more stable during drilling, and it is more difficult to deviate from the preset trajectory; when the hollow structure is selected, the weight of the device can be reduced, and when used on more complex terrain , can be easily transported.

[0033] The metal rod 1 has a length of 2-3 meters and a cylindrical shape. The cylindrical type is selected for use with the drill bit, and can be matched with the drill bit. The length is set at 2 to 3 meters, which is the best length selection based on computer simu...

Embodiment 2

[0041] Such as Figure 6-8 As shown, the present embodiment is verified by preset values, assuming that the length of the metal drill pipe is 2.5m, the radius is 3cm, and its lower end point is consistent with the ordinate of the bottom of the well. Above the upper end of the metal rod is a vertical electric dipole source with a length of 0.2m, which excites a differential Gaussian voltage pulse with a center frequency of 75MHz. The distances from the bottom of the well to the z=0m interface are 1.5m and 0.2m, respectively. The relative permittivity of the two-layer medium is 16 and 8, and the conductivity is 1mS / m and 0.1mS / m, respectively. The radius of the well is 5cm, the relative permittivity of the medium in the well is 60, the conductivity is 0.1S / m, and the radius is 5cm. Figure 4 is the simulation result of the profile response of the radar in the well with metal waveguide. For comparison, Figure 5 It is the simulation result of the traditional well radar. Appar...

Embodiment 3

[0043] The difference between this embodiment and Embodiment 1 is that the diameter of the metal rod is smaller than the diameter of the mine, the length of the metal rod is 2 to 3 meters, and the shape is cylindrical, and the wall thickness of the hollow structure of the metal rod is greater than 1 cm. It is connected to the radar instrument in the well through bolt connection. Bolted connections allow for easy disassembly, allowing the borehole radar to be shipped separately from the metal pole and assembled on site.

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Abstract

The invention discloses a metal guided wave detection method for forecasting a formation interface position in real time by in-well while drilling radar. As in-well radar uses a couple source along the drilling direction, common in-well radar only can detect an interface in a non-orthogonal direction next to the well and cannot detect the interface vertical to the well. Common in-well radar technology cannot detect the formation interface orthogonal to the drilled well and a new method or technology is needed to forecast front interface in real time. A metal guided wave is added between a radar emitting source and a drill. The metal guided wave is a cylindrical metal rod. In the radar drilling process, a metal rod or a metal drill will lead to generation of a lot of inclined reflective guided waves on the section of the radar. Common processing staff mainly removes the reflective guided waves as noises. The method disclosed by the invention forecasts the front interface by means of the reflective guided waves, so that the method is novel in concept and obvious in effect.

Description

technical field [0001] The invention relates to a radar metal guide detection method, in particular to a detection method and a device for real-time forecasting of the formation interface position by a radar while drilling in a well. Background technique [0002] In-hole radar can detect the wellside medium in mines or oil wells, while drilling radar can image the surrounding rocks in the drilling process to obtain real-time detection results. Therefore, it has a wide range of applications in construction and production with drilling safety problems. Value. We hope that during the excavation process, the radar while drilling can obtain the interface of the surrounding rock in real time, and according to the simple interface imaging process, it can quickly identify the dangerous medium boundary in front (such as water, mud or gas, etc.) in real time. However, the radar in the well uses a galvanic source in the same direction as the drilling, so it can only detect the non-ort...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 毛立峰
Owner CHENGDU UNIVERSITY OF TECHNOLOGY