RU2348803C2 - Method of whipstock orientation in drilling string assembly and running, and related device for implementation thereof - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: group of inventions refers to directed and horizontal well-drilling. Method consists that laser beam is directed sideways the whipstock, while on measuring panel, laser incidence point is registered, and angular distance of incidence point and whipstock mark is measured. Laser beam is rotated around and in parallel to the axis of downhole inclinometering system body until angle on the measuring panel between laser incidence point and whipstock mark is equal to zero. Then internal surface of downhole inclinometering system body in its end face is marked so that it lays the same radius of external laser. Then locating fixture designed as rod with its one end resting on removed mark and its another end resting on its antipode is mounted inside of the body within its cross plane. After the first antipode is attached and assembly is run the length of the attached pipe, in the pipe two parallel beams are directed towards the locating fixture along the axis. Then beam plane is rotated until the locating fixture reaches the beam plane, the mark is remove to the internal surface of the first pipe in its face end by position of the beam, illuminating half of the locating fixture resting on the previous mark. The second locating fixture is mounted similarly. After the following pipe is attached, mark removing along the internal surface is performed again on the basis of the previous locating fixture until drilling string is considered to be assembled completely. The device for method implementation contains three laser sources, downhole inclinometering system, prograduated measuring panel perpendicularly to the axis of whipstock turbo-drill in the same plane of whipstock direction mark. Three lasers are mutually parallel in diametral plane of the drilling string on the platform rotating around the drilling string axis. Herewith two of them are symmetrised within the string relative to its axes with one being outside. The device is supplied with locating fixtures designed as rods providing that one rod end rests on the removed mark on the internal surface of pipe drill with its second end resting on the antipode. Furthermore to identify the mark, half of the locating fixture resting on the mark is painted with one bright luminescent colour with another half painted with the other colour. The platform accommodates optical system equipped with monitor and compass on the empty seat of the platform to evaluate whipstock angle when the locating fixture reaches within plane of internal laser beams, as well as internal temperature stabilisation system.

EFFECT: higher accuracy and reduced time to evaluate whipstock orientation in drilling string running.

2 cl, 5 dwg

Description

The invention relates to the field of inclined and horizontal drilling, as well as to the field of workover.

A known method for continuously monitoring the position of the diverter during the descent of the drill string [1], widely used in practice. Moreover, in practice, the detection of the geometry of the drill string is performed visually, i.e. subjectively. The authors did not find any recommendations, methods, or devices for defecting the geometry of the drill string assembly together with the downhole inclinometric system in available information sources.

The essence of the known method is obvious and is as follows. At the ends of each element, the layout of the string, namely the drill pipe, marks are applied located in one axial plane. For this purpose, drill strings are rolled out onto the walkways and a special template with a level gauge is used. After labeling, the technologist proceeds with the assembly of the drill string. There is a mark on the diverter indicating the direction of action of the diverter. Upon completion of the assembly, it is necessary to measure the offset of the diverter angle. To this end, using the previously applied marks, the mark of the direction of action of the diverter is drilled to the upper end part of the downhole inclinometric system. Thus, on each element of the drill string, i.e. on the layout of the bottom of the drill string with the downhole inclinometric system and each drill pipe there is a mark, and therefore, when assembling the drill string at the points of their connection, there are two marks, between which either the angular distance or linear is measured with further conversion to angular. When this is used, as a rule, a paper tape or protractor when switching from element to element, with which the distance (angular or linear) between the previously applied marks is noted.

The disadvantages of this method are the following: a significant error in the measurement of the diverter angle, due to the need for successive removal of the label from element to element, which leads to the accumulation of errors, significant time expenditures. For reliability, it is necessary to repeatedly check the drift of marks, and this increases the total duration of tripping and lifting and increases the risk of column rotation. The method does not allow to objectively control the straightness of the layout area, significantly affecting the offset of the deflector angle.

The closest way to the proposed one is the method claimed in [2]. The content of the known method is as follows. The laser beam is directed towards the deflector and the point of incidence of the laser beam is fixed on the measuring panel. Then measure the angular distance between the point of incidence of the beam and the bottom mark - label deflector. The angle measurement process is repeated each time a regular drill pipe is connected. The total angle is calculated taking into account the signs of the measured angles. The final drift of the deflector mark is made according to the last mark and the total angle.

The disadvantages of this method are the following.

1. The need to take into account intermediate angles, which increases the measurement error.

2. Under adverse weather conditions (snow, rain, fog, wind), the total error of the demolition of the angle mark of the diverter can be significant, because the work on the demolition of the marks is carried out in the open air.

3. The maximum length by which the mark can be demolished is essentially equal to the length of the attached drill string element. The accuracy of label drift over long lengths is less. The ideal option is the demolition of the diverter tag to the very top of the drill string.

4. Label demolition work should be carried out at two levels - bottom and top, ie two people are needed for quality work.

5. The complexity of the work at the second level - at an altitude of more than 20 meters, especially in adverse weather conditions.

The known device includes [2] (see figure 1) three laser sources

1, 2, 3, mounted on a composite cylindrical rim 4 in radial planes, between which 120 degrees, parallel to the axis of the rim, a graduated measuring panel 6.

The disadvantages of this device is the following.

1. Low measurement accuracy due to adverse weather conditions (snow, rain, wind, fog).

2. The need to coordinate the actions of two people when working with a known device.

The technical result of the invention is to increase the accuracy and reduce the time to determine the orientation of the diverter during the launch of the drill string.

The technical result is achieved in that in the method of orienting the diverter during assembly and lowering of the drill string, the laser beam is directed towards the diverter and the point of incidence of the laser beam is fixed on the measuring panel, the angular distance between the point of incidence of the beam and the diverter mark is measured, and the laser beam is rotated around and parallel the axis of the bottomhole inclinometer system body until the angle between the point of incidence of the laser beam and the deflector mark on the measuring panel becomes zero, then to the inside On the front surface of the bottomhole inclinometric system case, a mark lying on its radius with an external laser is marked in its end part, after which a fixing element is made in the transverse plane inside the case, made in the form of a rod, abutting one end with a demarcated mark and the other diametrically opposite point, after connecting the first drill pipe and lowering the assembly to the length of the attached pipe inside the pipe, two parallel beams are directed along the axis towards the fixing element, then they draw the plane of the rays until the fixing element enters the plane of the rays, carry the mark on the inner surface of the first pipe to its end part according to the position of the beam illuminating the half of the fixing element, abutting against the previous mark and similarly install the second fixing element, after connecting another pipe, repeat the process the demolition of the label on the inner surface on the basis of the previous fixing element to the complete assembly of the drill string, the device includes three laser sources , a downhole inclinometric system, a graduated measuring panel mounted perpendicular to the axis of the turbodrill with the diverter in the same plane with the direction mark of the diverter, with three lasers mounted parallel to each other in the diametrical plane of the drill string on a platform mounted to rotate around the axis of the drill string, two of they are located inside the column symmetrically with respect to its axis, and one outside, while the device is equipped with fixing elements made in the form rods, with the possibility of stopping one end of the rod in a demolished mark on the inner surface of the drill pipe, and its second end on a diametrically opposite point, moreover, to identify the mark, half of the fixing element resting on the mark is painted in one bright luminescent color, and the other half is in another, while on the platform there is an optical system with a monitor and a compass in a free place on the platform to determine the angle of the deflector when the fixing element falls into the plane of the internal laser beams, and also a temperature stabilization system inside the device.

The advantages of the invention are as follows.

1. Operations to determine the spatial position of the diverter during the launch of the drilling tool are carried out inside the pipe ("in laboratory conditions"). Therefore, in all weather conditions, high measurement accuracy is achieved.

2. Measurements may not be made at each link of the drill string, but several mounted pipes may be “shot through" at once, which increases the accuracy of the measurement.

3. Measurements are carried out by the technologist on the ground (at zero level) in comfortable conditions. This ensures the safety of work, comfort, high quality measurements.

4. All measurement work can be done by one person.

Figure 1 shows: 1, 2, 3 — lasers, 4 — the device’s body, 5 — the fixing platform, 6 — the measuring panel, 7 — the stencil, 8 — the mirror, 9 — the body of the downhole inclinometer system with a deflector, B — the mark of the downhole inclinometric system, OS - the direction of the deflector, Bc - the projection of point B (drift of point B).

Figure 2 shows: 9 - the casing of the downhole inclinometric system with a deflector (see Fig. 1), 10 - the mark of the deflector, 11 - the laser beam (external), 12 - the demolished mark, 13 - the fixing element (first).

Figure 3 shows:

9 - housing downhole inclinometric system with a deflector (see figure 1), 12 - demolished mark (see figure 2), 13 - fixing element (see figure 2), 14 - the first drill pipe, 15 - laser beams (internal), 16 - demolished label, 17 - locking element (second).

Figure 4 shows:

1, 2, 3 - lasers (see figure 1), 11 - laser beam (external) (see figure 2), 15 - laser beams (internal) (see figure 3), 17 - fixing element ( see figure 3), 18 is a rotating platform, 19 is an optical surveillance system.

Figure 5 shows:

1, 2, 3 — lasers (see FIG. 1), 18 — rotating platform (see FIG. 4), 19 — optical surveillance system (see FIG. 4), 20 — monitor, 21 — compass.

Consider an example of a sequence of actions when implementing the inventive method (figure 2). The first lowering link is the BHA with a downhole inclinometric system 9. This link hangs vertically in the air. The mark of the diverter 10 is located at the lower level (ground level), and the upper end face of the downhole inclinometric system is approximately at an altitude of 20-25 meters. A measuring panel 6 is installed at the level of the mark. From the upper end of the downhole inclinometric system, a laser beam 11 is sent parallel to the body axis to the measuring panel. The incidence point and the angle between the incidence point and the deflector mark are fixed on the measuring panel. Turn the laser beam 11 until then, until the measured angle becomes equal to zero. At this moment, on the inner surface of the casing of the downhole inclinometric system, a mark 12 is marked in the end part thereof, lying on the same radius with the laser beam, after which a fixing element 13 is made inside the casing in the transverse plane thereof, made in the form of a rod, resting against the demolished mark at one end 12, and the other at a diametrically opposite point. After installing the locking element 13, the measuring panel 6 is removed and the bottom of the drill string with the downhole inclinometric system is lowered to their length, the first drill pipe 14 is connected and the first drill pipe is lowered again (Fig. 3). Thus, the locking element 13 is at a depth of the length of the first drill pipe 14, and its end is at ground level. Inside the pipe, two parallel beams 15 are directed along the axis towards the fixing element, then the plane of the rays is rotated until the fixing element 13 enters the plane of the rays. Then, the mark 16 is demolished on the inner surface of the first pipe to its end part according to the position of the beam illuminating the half of the fixing element, abutting against the previous mark 12 and the second fixing element 17 is similarly installed.

After attaching the second drill pipe and lowering the assembly to the length of the connected pipe, the label demolition process is repeated on the inner surface based on the previous fixing element until the drill string is fully assembled. The last mark indicates the position of the diverter mark.

A device that implements this method is shown in FIGS. 4 and 5. At the upper end of the assembled drilling tool, on a platform 18 rotating around its axis, three parallel lasers 1, 2, 3 are installed, located in one diametrical plane of the body, two of which are internal 1, 2 are located inside the body of the drill string symmetrically about its axis, and one external laser 3 is located outside the body (figure 4). The locking element 17 abuts at one end in a demolished mark, and the other at a diametrically opposite point. In addition, on a rotating platform 18 are located (Fig. 5) an optical surveillance system 19 with a monitor 20, a compass 21 for determining the angle of the deflector mark, and a stabilization system inside the device.

Information sources

1. L.Ya.Sushon, P.V. Emelyanov, R.T. Mullagaliev. - Management of deviation of deviated wells in Western Siberia. - M., Nedra, 1988.

2. The method of orientation of the diverter during assembly of the bottom of the drill string with the inclinometric system and a device for its implementation.

Authors: Fedechkin A.S., Tyan V.K., Tyan V.K. Patent 2237806.

Claims (2)

1. The method of orienting the deflector during assembly and lowering of the drill string, in which the laser beam is directed towards the deflector and the point of incidence of the laser beam is fixed on the measuring panel, the angular distance between the point of incidence of the beam and the mark of the deflector is measured, characterized in that the laser beam is rotated around and parallel to the axis of the casing of the downhole inclinometric system until the angle between the point of incidence of the laser beam and the deflector mark on the measuring panel becomes zero, then on the inside In the end part of the body of the bottomhole inclinometric system, a mark is marked that lies on the same radius as the external laser, after which a fixing element is made in the transverse plane inside the body, made in the form of a rod, one end resting against the demolished mark, and the other end diametrically opposite point, after attaching the first drill pipe and lowering the assembly to the length of the attached pipe inside the pipe, two parallel beams are directed along the axis towards the fixing element, then turn the rays of the rays until the fixing element falls into the plane of the rays, carry the mark on the inner surface of the first pipe to its end part according to the position of the beam illuminating the half of the fixing element, abutting against the previous mark, and in the same way set the second fixing element, after connecting another pipe repeat the process the demolition of the label on the inner surface on the basis of the previous locking element to the complete assembly of the drill string. 2. Orientation device for assembling and lowering the drill string, including three laser sources, a downhole inclinometer system, a graduated measuring panel mounted perpendicular to the axis of the turbodrill with a deflector in the same plane as the direction indicator of the deflector, characterized in that the three lasers are mounted parallel to each other in the diametrical plane of the drill string on a platform mounted to rotate around the axis of the drill string, two of which are located internally the column is symmetrical about its axis, and one is outside, while the device is equipped with fixing elements made in the form of rods, with the possibility of stopping one end of the rod in a demolished mark on the inner surface of the drill pipe, and its second end in a diametrically opposite point, and for identification half of the fixing element resting on the mark is painted in one bright luminescent color, and the other half is in the other, while on the platform there is an optical system with a monitor and compass free SG place the platform to determine the angle of contact with the deflector of the locking element into the plane of internal laser beams, and system stabilization temperature within the device.

Images