RU2232861C1 - Method for preventing intersection of shafts during multiple drilling of oil and gas wells - Google Patents

Abstract

FIELD: mining industry.

SUBSTANCE: method includes registration of resilient oscillations coming from vibration of chisel during drilling of well by means of devices, received signal is amplified and then transferred to recording device. Additionally filtering of incoming signal is performed with separation of signal from chisel and numbering of separated signal. Then approaching and moving away of well shafts intersection is determined by comparing received signal to limiting values of signal from chisel. Information about signal from chisel is concurrently transferred onto recording device and notification device.

EFFECT: higher reliability due to control of approaching and moving away of chisel of drilled well relatively to column of well in operation for one plurality of wells and column of well in operation placed on adjacent pluralities of wells, lesser material and laborer costs and easier mounting and maintenance of drilled well.

Description

The invention relates to the mining industry and can be used in cluster well drilling, providing for control of the curvature of the well.

A known method of directional drilling of wells, involving the application of shock-pulse force from a deflecting element in the bottomhole space of the well during drilling, continuously monitors its location during the drilling process, for which geophones are pre-installed around the wellhead, using which pulses are recorded and compared between by itself (AS No. 1740603, Е 21 В 7/04, dated April 27, 88).

The disadvantage of the above method is that it requires more material and human costs, the approximation or removal of the meeting of the bit of the well being drilled and the column of the production well (for one well) is not determined, the approach or removal of the meeting of the bit of the well being drilled and the column of the production well located on neighboring well bushes.

Closest to this invention is a method of preventing the occurrence of trunks during cluster drilling of oil and gas wells, which uses instruments to record casing vibrations in a drilled well coming from vibration of a bit in a drilled well, amplified by an electronic amplifier, and then transferred to a recording device (a S. S. No. 163138, E 21 B 7/04, 47/12, dated 17.12.62, prototype).

The disadvantage of this method is that the approach or removal of the meeting of the drill bit of the well being drilled and the production well string located on neighboring bushes is not determined, in addition, data from the devices is received only on paper, there is no warning system at the driller's post, signals are transmitted via wired communication, and this is possible gusts, the difficulty of laying long distances.

The proposed method for preventing the occurrence of trunks during cluster drilling of oil and gas wells is devoid of the above drawbacks and is highly reliable.In addition, it allows you to control the approach or removal of the meeting of wellbores not only on the drilled well, but also on previously drilled ones, it allows you to prevent the occurrence of trunks.

A method for preventing the occurrence of trunks during cluster drilling of oil and gas wells includes recording elastic vibrations coming from the vibration of the bit during drilling, using instruments, amplifying, and then transmitting to the recording device, in addition, the incoming signal is additionally filtered to isolate the signal from the bit , digitizing the selected signal and determining the approximation or removal of the meeting of the wellbores by comparing the incoming signal with the threshold values of the signal from the bit and transmitting information about the signal from the bit simultaneously to the recording device and the warning device.

The drawing shows a diagram of the implementation of the proposed method.

In the method for preventing the occurrence of shafts during cluster drilling of oil and gas wells, a vibration sensor 1 is installed at the mouth of the production well.

To quickly determine the approximation or removal of the meeting of the well being drilled and the production string, a signal is received from the bit in the well being drilled. When drilling a well, the bit creates elastic vibrations in the environment, which are transmitted to the production string, where vibration sensor 1 is located, which records elastic vibrations and converts these vibrations into an electrical signal, followed by filtering in signal amplifier-converter 2 and digitizing, decomposing and comparing the signal in the technological controller 3.

The magnitude of the incoming signal from the vibration sensor determines the approximation or removal of the meeting of the wellbores by comparing this value with the threshold values of the signal from the bit and the received information about the signal is simultaneously transmitted to the recording device 4 and to the notification device 5.

The method is as follows.

In the process of drilling a well, when the bit interacts with rocks, elastic vibrations arise, which are transmitted in the form of longitudinal and transverse waves through the rock and production casing to the wellhead, where they are detected by vibration sensors 1 and converted into an electrical signal. This signal is amplified and normalized to a standard 4-20 mA electric signal in the signal converter 2, and then it is fed to the analog inputs of the technological controller 3, where the signal from the analog (current) is converted to digital (or the digital signal is digitized). The digital signal is processed in the processor module of the technology controller 3, i.e. carry out the decomposition of the incoming signal into components - harmonics, then the selection of the signal from the bit. The extracted signal is compared with the threshold values of the signal from the bit in the network processor module of the technological controller 3. After that, a control signal is supplied to the relay module of the technological controller 3, which, under the influence of the control signal, closes the corresponding relay contacts and supplies power to the warning device 5.

Threshold values of the signal from the bit - these are the experimentally determined boundary values of the signal from the bit, the output of which corresponds to a particular situation (approximation or removal of the meeting of the trunks).

The control signal from the technological controller 2 simultaneously arrives at the recording device (PC) 4 and the notification device 5. In the recording device - the PC 4, information about the signal from the bit is entered into the database for subsequent use, for example, displaying information in the form of graphs, tables on a monitor screen, output to a printer. In the notification device 5, depending on the size of the incoming signal from the bit, the light and sound alarms are turned on.

There are four operating modes of the notification device 5:

1 mode - the green lamp lights up - removal of the bit from the production well;

2 mode - the yellow lamp lights up - the bit is approaching the production well;

3 mode - the red lamp lights up - emergency mode, the bit of the well being drilled has approached the production well at an unacceptable distance;

4 mode - the sound siren is turned on - emergency mode, the bit of the well being drilled has approached the production well at an unacceptable distance;

the third and fourth modes are turned on simultaneously.

With the help of signaling modes, the drilling personnel are informed about the situation (approaching or removing the borehole meeting) in the process of drilling the well.

Communication between elements (devices for receiving, transmitting and processing a signal from a bit) of a system for preventing the occurrence of trunks during cluster drilling of oil and gas wells can be carried out via wired or combined (for example, wired and radio communication) lines.

Thus, the method for preventing the occurrence of trunks during cluster drilling of oil and gas wells makes it possible to determine, control the approach or removal of the meeting of the bit of the well being drilled and the production string not only on the drilled well, but also on previously drilled, i.e. to prevent the meeting of trunks during cluster drilling of oil and gas wells. This method does not require large material and human costs.

This method of preventing the occurrence of trunks during cluster drilling of oil and gas wells was tested when drilling wells in the Tyumen region.

Claims (1)

A method for preventing the occurrence of trunks during cluster drilling of oil and gas wells, including recording elastic vibrations coming from the vibration of the bit during drilling of a well, using instruments, amplification, and then transmitting to a recording device, characterized in that the signal is additionally filtered with a signal from bit, then digitizing the selected signal and determining the approximation or removal of the meeting of the wellbores by comparing the signal with the threshold values of the signal from the bit and gears information about the signal from the bit simultaneously to the recording device and the notification device.