The control method of drilling deviated horizontal wells

 

(57) Abstract:

The invention relates to drilling, and in particular to methods of monitoring wells. The method includes drilling the wellbore composition of the drill string, consisting of drill pipe, drill bit, downhole motor and bent sub, which is located downhole with the installed sensor and telemetry system with a downhole device located above the downhole motor, the transmission of information from the sensor wirelessly downhole telemetry system and then to the surface. Downhole tool with a sensor placed in the sub between the bit and the shaft of the downhole motor, the sensor measure the frequency of rotation of the bit. In mathematical terms determine the amount of axial load. As a wireless communication channel using ultrasonic or any other wireless communication channel. The application of the method allows to obtain information about the magnitude of the axial load. 1 C.p. f-crystals.

The invention relates to the field of drilling, and in particular to methods of process control downhole drilling motors deviated horizontal wells.

A known method of controlling the Lotto and parameters of drilling fluid, depending on the parameters of drill cuttings.

However, this method does not allow you to quickly get information about the loads on the bit during drilling inclined and horizontal wells.

The closest in technical essence and the achieved result is a control method of drilling deviated horizontal wells, including drilling of the wellbore composition of the drill string, consisting of drill pipe, drill bit, downhole motor and bent sub, which is located downhole with the installed sensor and telemetry system, the downhole tool which is located above a downhole motor, and the transmission of information from the sensor wirelessly downhole telemetry system and then follow the cable to the surface. /2/.

The known method does not allow you to get complete information about the location of the bottom hole in space, about the size of the axial load on the bit during drilling deviated horizontal wells and insufficiently accurate measurements.

The aim of the present invention is the ability to complete information about the magnitude of the axial load on the bit during drilling deviated horizontal wells and increased precision ismono-horizontal wells, it includes drilling the wellbore composition of the drill string, consisting of drill pipe, drill bit, downhole motor and bent sub, which is located downhole with the installed sensor and telemetry system with a downhole device located above the downhole motor, the transmission of information from the sensor wirelessly downhole telemetry system and then to the surface, according to the invention, a downhole tool with a sensor placed in the sub between the bit and the shaft of the downhole motor, and the sensor measures the rotational speed of n bits, which determine the magnitude of the axial load on the bit by the formula:< / BR>
< / BR>
where nx- frequency of rotation of the bit at idle mode,

n is the frequency of rotation of the bit,

K - coefficient of proportionality, which is determined empirically during benchmark testing downhole motors.

In addition, as a wireless communication channel using ultrasonic or any other wireless communication channel.

The method consists in the following.

Drilling deviated horizontal section of the wellbore lead layout drill quinny device with the installed sensor, and telemetry system with a downhole device that is installed above the downhole motor. Information is transmitted from the sensor wirelessly downhole telemetry system and then to the surface.

In the process of drilling measure the frequency of rotation of the bit by means of the sensor, which is installed in the Autonomous downhole tool, located in the sub between the bit and the shaft of the downhole motor. Information from the sensor wirelessly, for example by ultrasonic channel, or any other, is transmitted downhole telemetry system installed above the downhole motor. Further information is transmitted over cable (or other way) to the surface.

The dependence of the axial load on the bit can be represented as the following expression:

G=U(nx,n),

where nx- frequency of rotation of the bit when idle,

n is the frequency of rotation of the bit,

U - function.

The function U can linearize with sufficient accuracy in the form:

< / BR>
where nx- frequency of rotation of the bit during idle mode (G=0) - passport characteristic of the shaft hole of the engine,

n is the frequency of rotation of the bit, superensemble engines.

When conducting bench tests take the load on the bit G=0, then the value of the frequency of rotation of the bit during idle mode is equal to the passport.

In the presence of axial load on the bit appears braking and the amount of speed it decreases.

If n=0, then the value of the load is considered to be the brake, whereby rotation of the shaft in the downhole motor stops.

nx- passport size, i.e. the frequency of idling rotation (G=0).

Example.

If the passport value of nxof rotation of the bit (shaft mud motor) is equal to 250 rpm and in the process of drilling the frequency of rotation of the bit (shaft mud motor), measured by the sensor is equal to n=150 rpm

Bench tests showed that K=15 rpm, then the axial load is equal to:

< / BR>
The use of the invention allows to obtain complete information about the magnitude of the axial load on the bit while drilling directional horizontal section of the wellbore, which will allow control of the drilling process.

Sources of information

1. A. C. the USSR 1693235, CL E 21 In 44/00, publ. 1991, BI 3.

2. Bulatov, A. I. and other Control processes drilling is I deviated horizontal wells, it includes drilling the wellbore composition of the drill string, consisting of drill pipe, drill bit, downhole motor and bent sub, which is located downhole with the installed sensor and telemetry system with a downhole device located above the downhole motor, the transmission of information from the sensor wirelessly downhole telemetry system and further to the surface, wherein the downhole tool with a sensor placed in the sub between the bit and the shaft of the downhole motor, and the sensor measures the rotational speed n of the bit, which determine the magnitude of the axial load on the bit by the formula

< / BR>
where nx- frequency of rotation of the bit when idle,

n is the frequency of rotation of the bit,

K - coefficient of proportionality, which is determined empirically during benchmark testing downhole motors.

2. The method according to p. 1, characterized in that the quality of the wireless communication channel using ultrasonic or any other wireless communication channel.

 

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