A system and method for detecting accident wells

A technology for accident wells and rescue wells, which is applied in earthwork drilling, wellbore/well components, construction, etc., and can solve the problem of unsure of the convergence current of metal pipe strings in accident wells, unknown current consumed by electrodes, and inability to converge metal in accident wells. String and other issues

Inactive Publication Date: 2019-01-22
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the downhole three electrodes are three electrodes with the same polarity, and the polarity of the surface electrode is opposite, a current path will still be formed between the downhole electrode and the surface electrode through the well fluid, and the current cannot be converged to the metal pipe string of the accident well. , so that it is impossible to generate converging current on the accident well
[0006] Therefore, the current consumed between the electrodes is unknown, and the resistivity of the combined formation is unknown; thus, even if the total current supplied by the power source is known, it is still impossible to determine the converging current on the metal pipe string of the accident well, which in turn affects the Accuracy of the distance and azimuth between the rescue well and the accident well measured by the secondary field generated by the converging current

Method used

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  • A system and method for detecting accident wells
  • A system and method for detecting accident wells
  • A system and method for detecting accident wells

Examples

Experimental program
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Effect test

Embodiment 1

[0062] see figure 1 , which shows a system 1 for detecting accidental wells provided by an embodiment of the present invention, the system 1 may include: a low-frequency power supply 10, a mode control switch 20, a surface electrode 30, a downhole focusing electrode system 40, a sensor 50, The ground data processing unit 60, and the cable 70 that connects the above-mentioned devices; it can be understood that the cable 70 can specifically select transmission lines or cables of different models, specifications and functions according to the different devices that need to be connected. I won’t go into details here;

[0063] Among them, the low-frequency power supply 10 is used to provide current for the surface electrode 30 and the downhole focusing electrode system 40 according to the control of the mode control switch 20;

[0064] The mode control switch 20 is used to control the working mode of the system; and, when the system 1 is in the formation resistivity measurement mo...

Embodiment 2

[0087] Based on the above scheme, the equivalent circuit corresponding to the circuit system composed of the low-frequency power supply 10, the mode control switch 20, the surface electrode 30, and the downhole focusing electrode system 40 is as follows: Figure 6 shown. exist Figure 6 , the circuit component numbers are consistent with the component numbers appearing in the foregoing embodiments. It should be noted that the mode control switch 20 can be controlled by the switch K 0 and switch K 1 Realize, R 1 to R 5 is the stray impedance of the formation.

[0088] Based on this equivalent circuit, when the switch K 0 open, switch K 1 When closed, the system is in the formation resistivity measurement mode, that is, the shallow lateral mode. At this time, the ammeter A can 1 The current measured to obtain the main electric stage 41 is I 0 , can be passed through the ammeter A 2 The total current that is measured and obtained by the first shielding electrode pair 46,...

Embodiment 3

[0092] Based on the same technical idea of ​​the foregoing embodiments, see Figure 7 , which shows a method for detecting an accidental well provided by an embodiment of the present invention, the method is applied to a system for detecting an accidental well, and the system includes a low-frequency power supply, a mode control switch, a ground electrode, a downhole focusing electrode system, The sensor, the ground data processing unit, and the cables that connect the above devices in sequence, wherein the ground electrode 30 is set on the ground where the accident well is connected to the reverse extension line in the direction of the rescue well and the first distance is preset from the accident well , the focusing electrode system is arranged under the rescue well, and the sensor is arranged at a second distance below the focusing electrode system, and the method includes:

[0093] S701: When the system is in the formation resistivity measurement mode, the mode control swi...

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Abstract

The embodiment of the invention discloses a system and method for detecting an accident well. The system comprises a low-frequency power supply, a mode control switch, a ground electrode, an underground focusing electrode system, a sensor and a ground data processing unit. According to the system, current consumed between electrodes due to the electrical conductivity of drilling fluid in a rescue well is reduced through the method of designing the focusing electrode system, and the electrical resistivity of a stratum can be obtained through the method of adjusting the mode control switch, so that gathered current gathered on a metal pipe column of the accident well is obtained accurately, and the azimuth accuracy of the accident well measured through a secondary field generated by the gathered current is further improved.

Description

technical field [0001] The invention relates to the safety technology of oil exploitation, in particular to a system and method for detecting accidental wells. Background technique [0002] In offshore and land drilling operations, once a blowout occurs out of control, oil and gas resources will be severely damaged, and it is easy to cause fire, causing casualties, equipment damage, oil and gas well scrapping, environmental pollution and many other adverse effects. In the field of oil exploitation, the oil well that has a blowout accident is called an accident well; in order to rescue and control the accident well, the directional well that is designed and constructed in a safe area at a certain distance from the accident well is called a rescue well. After a blowout accident, high-density well killing fluid is usually injected from the rescue well to control and seal the accident well. Therefore, detecting and locating accident wells in rescue wells is one of the key techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/092E21B49/00
CPCE21B47/092E21B49/00
Inventor 党博李峰飞蒋世全周建良刘容陈嘉辉安百新刘红兰王登岳
Owner XI'AN PETROLEUM UNIVERSITY
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