RU62253U1 - THE INDUCTION LOGGING DEVICE FOR RESEARCHING HORIZONTAL WELLS IN THE DRILLING PROCESS - Google Patents

Abstract

Usage: geophysical studies of directional and horizontal wells during drilling. Purpose: improving the reliability of the device, expanding the range of wells under study in the direction of reducing their diameter, increasing the manufacturability of the container. The inventive container for the induction logging device is made by special molding of the cross section of the pipe.

Description

The invention relates to geophysical surveys of directional and horizontal wells during drilling.

A device is known for researching horizontal wells during drilling (RF patent No. 2236583, E 21 B 47/00, 2004), in which the delivery of a geophysical instrument into the well and research is carried out on a drilling tool inside the container, which is used as the bottom drill pipe.

In this part, the device is reliable in operation and ensures the delivery of the device to the bottom of the well and extraction to the surface, since the work is carried out on metal drill pipes. However, it is unacceptable for work with induction logging tools, where the electrical transparency of the container is required. Attempts to use plastic pipes as a container do not provide reliability, as fiberglass does not withstand dynamic shock loads during drilling, which can lead to emergency situations in the well.

A device for the study of horizontal wells (catalog "GEOLINK (UK) LTD", AB21 OGZ, Scotland, UK, 2002), taken as a prototype. In this device, the induction logging tool is delivered to the bottom of the well in a metal container located at the lower end

drill pipe in front of the downhole motor. The container is made of solid metal round timber with a longitudinal external groove for accommodating an induction logging tool and longitudinal cannon drilling for drilling mud passage. At the ends of the container, a thread is made for connection with a drilling tool. This device provides research, reliable delivery of the induction device into the well and its extraction to the surface, but has significant disadvantages.

The main disadvantage is a significant narrowing of the hydraulic channel compared to the drilling tool, which creates additional hydraulic resistance and adversely affects the flushing and operation of the downhole motor. With a decrease in the diameter of the container, there comes a moment when the cross section of the hydrochannel can no longer be reduced, and therefore wells with small diameters cannot be explored. In addition, the container is difficult to manufacture, metal-consuming, as it is necessary to perform cannon drilling in a solid metal round log.

The objective of the present invention is: to increase the reliability of the device, expanding the range of the studied wells in the direction of reducing their diameter, increasing the manufacturability of the container.

The problem is solved as follows:

In the induction logging device for the study of horizontal wells during drilling, containing the drilling tool in the form

bits, a downhole motor and drill pipes, a container with a longitudinal external groove for accommodating the induction logging tool and a longitudinal internal channel for drilling mud passage, an induction logging tool, a longitudinal external groove for hosting the induction logging tool and an internal channel for drilling mud passage pipes.

The proposed technical solution has the following significant differences and advantages compared to the prototype:

- The implementation of a longitudinal external groove to accommodate the induction logging tool and the internal channel for the passage of the drilling fluid by molding the pipe wall ensures that the channel is made of the maximum possible cross section based on the specific size of the device and container, subject to minimal distortion of the electromagnetic field of the device.

From a comparison of figure 1 and figure 2 it is obvious that the cross-sectional area And will always be less than the area B with the same D and d. From figure 2 it is also seen that it is possible to increase the area of the passage section B if the shape indicated by the dotted line is fulfilled, but at the same time the device is deeper “embedded” into the metal and there is a greater distortion of the magnetic field of the device. Therefore, the optimal shape is obtained by "pressing" the device into the pipe.

- The proposed technical solution allows you to expand the range of the studied wells in the direction of reducing the diameter, which is achieved by reducing the diameter of the container, compared with the prototype with one and

the same cross section of the device due to the possibility of maintaining the necessary channel section for the drilling and flushing process.

- The proposed technical solution allows to improve the manufacturability of the container due to the fact that it is much easier to mold the container from the pipe than to perform a longitudinal groove and channel by machining from a whole round log.

Compared to the prototype:

- with the same dimensions of the cross section of devices and containers, provides a larger section of the channel for the passage of drilling fluid;

- ensures that the channel cross section for the passage of drilling fluid is maximally possible for specific dimensions of the cross section of the device and container with minimal distortion of the electromagnetic field of the device;

- with the same dimensions of the transverse dimensions of the cross-sections of the devices provides the study of wells with smaller diameters.

The design of the proposed container is economical and easy to implement.

The proposed induction logging device for studying horizontal wells during drilling, represented by figure 3, contains: a drill pipe 1, on the lower lock of which a container 2 is fixed, a downhole motor 3 with a diverter and a bit (not shown in the figure), and an induction logging tool 4, installed in the outer groove of the container 2 on the shock absorbers 5.

Information from the induction logging tool 4 to the surface can be transmitted via a cable communication line, through a hydraulic, electromagnetic or acoustic communication channel.

Well research using the proposed device is carried out in the following sequence:

- on the container 2 install the induction logging tool 4 on the shock absorbers 5;

- lower into the well at the lower end of the drill pipe 1 container 2 with a downhole motor 3 with a diverter and a bit;

- start the drilling process, while the information from the induction logging tool 4 through any of the communication channels is transmitted to the surface.

The obtained information is used for operational control of the wellbore trajectory during drilling.

The use of the proposed device can be carried out in conjunction with other devices, for example, with a container in which the inclinometer is located. Moreover, the container with the inclinometer can be located both in front and behind the proposed device, depending on the tasks being solved.

As a result of the implementation of the proposed device, it was possible to create a metal container with a diameter of 90 mm, with an induction logging tool with a diameter of 42 mm placed in its longitudinal external groove for working on a boring tool with locks with a diameter of 108 mm. Possible use

a container with locks with a diameter of 95 mm, while the cross-sectional area of the channel for the passage of drilling mud of a container made of steel pipe with a wall thickness of 7.5 mm was approximately equal to the area of the internal section of the castle (054 mm) with a diameter of 108 mm.

Bench and downhole tests of the container were carried out, which were carried out in the Neftekamsk UBR. Taking into account emergencies arising during the drilling process, the container was tested for an internal pressure of 150 kg / cm ² and a torque of 800 kg. During borehole tests for permissible mechanical loads, the container was included in the layout of the lower part of the drill string. Within 24 hours, drilling was carried out on site No. 1900 of the Baysarovskaya area in the interval 1397-1470 m, with a curvature angle of 33-38 °. At the same time, the parameters of the drilling process were: axial load on the bit - up to 8 t, flushing pressure - 80-85 kg / cm ² .

Tests have shown that the container ensures the operability of the device under real mechanical loads that arise during the drilling of the well.

Downhole tests of the induction logging device together with the ORBI-3 inclinometric system were carried out on directional well No. 354 of the Chekmagushevskaya area. The well was drilled with a bit with a diameter of 123.8 mm. Information was transmitted by

cable communication technology for wet contact. In the process of drilling, a continuous electrical resistivity measurement of the rocks was carried out while the bottom hole was deepened in the interval 1786-1862 m. When drilling a section of the well with an zenith angle of 41.4-43.8 °, the drilling process parameters were: axial load on the bit - up to 6 tons, flushing pressure - up to 100 kg / cm ² , penetration rate - from 1 to 2.5 m / h.

Well testing in the horizontal section was carried out jointly with ORBI-3 at well No. 11512 of Arlan Square. The well was drilled with a bit with a diameter of 123.8 mm, information was transmitted via a cable communication line. At the same time, the proposed device provided measurements by induction logging for 68 hours during the drilling of a horizontal wellbore. During this time, 213 meters of rock were drilled.

All of the above confirms the effectiveness of the proposed induction logging device in the process of drilling horizontal wells.

Claims (1)

An induction logging device for studying horizontal wells during drilling, containing a drilling tool in the form of a bit, a downhole motor and drill pipes, a container with a longitudinal external groove for accommodating the induction logging tool and a longitudinal internal channel for the passage of the drilling fluid, the induction logging device, characterized in that the longitudinal external groove for accommodating the induction logging tool and the internal channel for the passage of the drilling fluid are made by molding the pipe wall.