CN207673333U - A kind of rotary well bore sidewall core taker - Google Patents

Abstract

The utility model provides a rotary well wall coring device, which comprises a coring motor pump unit (1) and a pushing motor pump unit (2). The rotary well wall coring device is characterized in that the coring The motor pump group (1) includes a first DC brushless motor and a gear pump connected to the first DC brushless motor, and the pushing motor pump group (2) includes a second DC brushless motor and a gear pump connected to the first DC brushless motor. The second DC brushless motor is connected to the plunger pump. The rotary well wall coring device provided by the utility model has strong versatility and can well meet the needs of oil well logging with small well diameters.

Description

A rotary well wall corer

technical field

The utility model relates to the technical field of petroleum well logging, in particular to a rotary well wall coring device.

Background technique

For nearly a century, with the increasing demand for oil and natural gas in human society, the exploration and development of oil and gas has become more and more important. During the exploration and development of oil and gas fields, cores are used to analyze the lithology and physical parameters of reservoirs. Waiting is a very important job.

The rotary borehole coring device is a petroleum logging instrument specially used for fixed-point continuous sampling, calibration and storage of components such as wellbore rocks in oil and gas fields. The rotary borehole coring device generally uses hydraulic transmission technology to complete the pushing of the instrument. , Drilling, core pushing and coring, etc. rely on the motor pump unit to provide power for the hydraulic system. However, the current rotary well wall coring device uses an AC motor to form a motor pump unit, and the steering of the AC motor in the downhole The control and speed regulation are difficult to realize, the efficiency is low and the volume is large, so the outer diameter of the rotary sidewall coring device is too large, which seriously restricts the oil production capacity of the rotary sidewall coring device in small wells. applications in well logging.

Therefore, how to improve the versatility of the rotary sidewall corer to meet the needs of small diameter oil well logging has become a technical problem to be solved urgently in this field.

Utility model content

In view of this, the utility model provides a rotary borehole wall coring device, which has strong versatility and can well meet the needs of small diameter oil well logging.

In order to achieve the above object, the utility model provides the following technical solutions:

A rotary well wall coring device, comprising a coring motor pump set and a pushing motor pump set, the coring motor pump set includes a first DC brushless motor and a The connected gear pump, the pushing motor pump set includes a second DC brushless motor and a plunger pump connected to the second DC brushless motor.

Preferably, in the above-mentioned rotary borehole wall coring device, the coring motor pump set is connected to the coring branch of the hydraulic transmission system, and the pushing motor pump set is connected to the pushing branch of the hydraulic transmission system, The hydraulic transmission system includes a control branch for connecting the coring branch and the pushing branch, and a check valve, a two-position three-normally closed solenoid valve and a bypass valve are sequentially connected in series on the control branch The one end of the one-way valve away from the two-position three-position normally-closed solenoid valve and the bypass valve is an inlet, and one end of the entrance of the one-way valve is connected to the pushing branch.

Preferably, in the above-mentioned rotary borehole wall core remover, neither the first brushless DC motor nor the second brushless DC motor includes a Hall sensor.

Preferably, in the above-mentioned rotary borehole wall core remover, the first brushless DC motor is installed on one side of the first mounting base, and the gear pump is installed on the other side of the first mounting base, A first coupling for connecting the first brushless DC motor and the gear pump is arranged in the first installation seat.

Preferably, in the above-mentioned rotary borehole wall core remover, the second brushless DC motor is installed on one side of the second mounting base, and the plunger pump is installed on the other side of the second mounting base, A second coupling for connecting the second brushless DC motor and the plunger pump is arranged in the second installation seat.

According to the above-mentioned technical scheme, in the rotary well wall coring device provided by the utility model, the core motor pump unit and the push motor pump unit all adopt DC brushless motors, and DC brushless motors have a smaller volume than AC motors. At the same time, the push motor pump unit uses a compact plunger pump to output power, so the technical solution of the utility model can reduce the shape of the hydraulic power section of the rotary well wall corer size, and the outer diameter of the hydraulic power section is the main factor restricting the maximum outer diameter of the rotary borehole wall coring device. needs, and has strong versatility.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description It is only an embodiment of the utility model, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a schematic diagram of a power section of a rotary well wall coring device provided by an embodiment of the present invention;

Fig. 2 is the schematic diagram of part 1 in Fig. 1;

Fig. 3 is the schematic diagram of part 2 in Fig. 1;

Fig. 4 is a schematic diagram of the hydraulic transmission system of the rotary borehole wall corer provided by the embodiment of the present invention.

Labeled in the figure:

1. Coring motor pump set; 11. The first brushless DC motor; 12. The first screw; 13. The first mounting seat; 14. The first coupling; 15. Gear pump; 2. Pushing motor pump Group; 21. The second DC brushless motor; 22. The second screw; 23. The second mounting seat; 24. The second coupling; 25. The plunger pump; 3. The fixed seat; , Coring branch; 52, Pushing branch; 6, Two two three normally closed solenoid valve; 7, Bypass valve.

Detailed ways

For ease of understanding, the utility model will be further described below in conjunction with the accompanying drawings.

Referring to Figures 1 to 3, Figure 1 is a schematic diagram of a power section of a rotary shaft wall coring device provided by an embodiment of the present utility model; Figure 2 is a schematic diagram of part 1 in Figure 1; Figure 3 is a schematic diagram of part 1 in Figure 1 2 schematic.

The fixed seat 3 in the power joint casing 4 of the rotary well wall coring device provided by the embodiment of the utility model is equipped with a coring motor pump unit 1 and a push motor pump unit 2, wherein the coring motor pump unit 1 includes The first DC brushless motor 11 and the gear pump 15 that is connected with the first DC brushless motor 11, as shown in Figure 2; The plunger pump 25 connected with the brushless motor 21 is shown in FIG. 3 .

In the rotary well wall coring device provided by the utility model, both the coring motor pump group 1 and the pushing motor pump group 2 adopt DC brushless motors, and the DC brushless motors have the advantage of small volume compared to AC motors, and at the same time , the push motor pump unit 2 adopts the plunger pump 25 with the characteristic of compact volume to output power, so the technical solution of the utility model can reduce the external dimensions of the hydraulic power section of the rotary well wall corer, The outer diameter of the hydraulic power section is the main factor restricting the maximum outer diameter of the rotary borehole wall coring device. Therefore, the rotary borehole wall coring device provided by the utility model can well meet the needs of small diameter oil well logging , has strong versatility.

Referring to Fig. 4, it is a schematic diagram of the hydraulic transmission system of the rotary borehole wall coring device provided by the embodiment of the utility model. The coring motor pump unit 1 is connected to the coring branch 51 of the hydraulic transmission system, and pushes against the motor pump unit 2 The pushing branch 52 of the hydraulic transmission system is connected, and the hydraulic transmission system includes a control branch for communicating with the coring branch 51 and the pushing branch 52. On the control branch, there are one-way valves (not marked in the figure) connected in series. ), the two-position three-normally closed solenoid valve 6 and the bypass valve 7, the end of the check valve far away from the two-position three-normally closed solenoid valve 6 and the bypass valve 7 is the inlet, and the inlet end of the check valve is connected to the push branch 52.

When in use, set PG2 (pressure sensor) to be consistent with the sequence valve pressure when the drilling cylinder is in motion. The pressure in the branch 52 rises, and when the pressure in the push branch 52 reaches the set value of PG2, PG2 feeds back the signal to the controller, and then controls the two-position three-normally closed solenoid valve 6 to change direction, so that the push branch The hydraulic oil in 52 is used as the control oil to change the direction of the bypass valve 7, so that the coring branch 51 is pressed up, and then the coring action is completed.

The rotary well wall coring device provided by the utility model directly controls the action of the coring branch 51 by pushing against the pressure of the branch 52, which is beneficial to improving the reliability and accuracy of the overall action.

In specific practical applications, the first brushless DC motor 11 and the second brushless DC motor 21 can adopt a position feedback brushless DC motor, that is, the Hall sensor is not included in the brushless DC motor. The temperature index of the Hall sensor is often difficult to meet the temperature requirements of the downhole, so the use of a non-position feedback DC brushless motor will help to enhance the adaptability of the rotary sidewall corer.

As shown in Figure 2, in this embodiment, the first brushless DC motor 11 is installed on one side of the first mounting base 13 through the first screw 12, and the gear pump 15 is installed on the other side of the first mounting base 13, A first coupling 14 for connecting the first brushless DC motor 11 and the gear pump 15 is arranged in the first mounting base 13 .

As shown in Figure 3, the second DC brushless motor 21 is installed on one side of the second mounting base 23 through the second screw 22, and the plunger pump 25 is installed on the other side of the second mounting base 23, and the second mounting base 23 A second coupling 24 for connecting the second DC brushless motor 21 and the plunger pump 25 is arranged inside.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (5)

1. a kind of rotary well bore sidewall core taker, including coring motor pump group (1) and backup motor pump group (2), which is characterized in that institute Coring motor pump group (1) is stated to include the first DC brushless motor (11) and with first DC brushless motor (11) be connected Gear pump (15), the backup motor pump group (2) are electric including the second DC brushless motor (21) and with second brush DC The plunger pump (25) that machine (21) is connected.

2. rotary well bore sidewall core taker according to claim 1, the coring motor pump group (1) is connected to Hydraulic Power Transmission System Coring branch (51), the backup motor pump group (2) is connected to the backup branch (52) of the Hydraulic Power Transmission System, and feature exists In, the Hydraulic Power Transmission System includes the controlling brancher for being connected to the coring branch (51) and the backup branch (52), It is remote that check valve, two-bit triplet normally closed solenoid valve (6) and by-passing valve (7), the check valve have been sequentially connected in series on the controlling brancher It is entrance from one end of the two-bit triplet normally closed solenoid valve (6) and by-passing valve (7), and entrance one end of the check valve connects The backup branch (52).

3. rotary well bore sidewall core taker according to claim 1 or 2, which is characterized in that first DC brushless motor (11) and second DC brushless motor (21) does not include Hall sensor.

4. rotary well bore sidewall core taker according to claim 3, which is characterized in that first DC brushless motor (11) Side mounted on the first mounting base (13), the gear pump (15) are mounted on the other side of first mounting base (13), institute State the be provided in the first mounting base (13) for connecting first DC brushless motor (11) and the gear pump (15) One shaft coupling (14).

5. rotary well bore sidewall core taker according to claim 4, which is characterized in that second DC brushless motor (21) Side mounted on the second mounting base (23), the plunger pump (25) are mounted on the other side of second mounting base (23), institute State the be provided in the second mounting base (23) for connecting second DC brushless motor (21) and the plunger pump (25) Two shaft couplings (24).