Miniature electric submersible pump device for oil testing operation

Abstract

The utility model discloses a miniature electric submersible pump device for oil testing operation. Comprising a testing tubular column which is used for being put into a casing pipe and is matched with a testing packer in the casing pipe to be set in the casing pipe; the sealing cylinder is arranged on the inner wall of the lower part of the test tubular column; the electric submersible pump unit comprises a cable, a cable head, a monitoring short section, a micro motor, a micro protector and a micro electric submersible pump which are sequentially connected from top to bottom, and the micro motor is electrically connected with the micro electric submersible pump; the electric submersible pump unit is used for entering the test tubular column; and the positioning insertion seal is arranged below the micro electric submersible pump and is used for being matched with the sealing cylinder to seal the electric submersible pump unit in the test tubular column. The beneficial effects of the utility model are that the test tubular column, the sealing cylinder, the electric submersible pump unit and the positioning insertion seal are arranged; the electric submersible pump unit comprises a cable, a cable head, a monitoring short section, a micro motor, a micro protector and a micro electric submersible pump which are sequentially connected from top to bottom; a cable crossing process is not needed, the field operation time is saved, and the reliability of the system is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical engineering, in particular to a micro electrical submersible pump device for well testing operation. Background Art

[0002] In the process of oil exploration and development, in order to clarify relevant data such as the production, pressure, and fluid physical properties of underground oil and gas layers, well testing operations are required. During the operation, generally, a negative pressure is created inside the test tubing string to induce underground oil and gas flows out of the well. In the case where the formation energy is insufficient and creating a negative pressure inside the tubing string still cannot induce the oil and gas to flow out of the well, artificial lift operations need to be carried out for induction. Common artificial lift methods include jet pumps, screw pumps, gas lift, electrical submersible pumps, etc. Conventional electrical submersible pumps need to be connected to the test tubing string and lowered into the well together with the test tubing string, and cable penetration needs to be made, which not only has complex processes but also poor reliability. Content of the Utility Model

[0003] The purpose of the utility model is to provide a micro electrical submersible pump device for well testing operation, which is provided with a test tubing string, a sealing cylinder, an electrical submersible pump unit, and a positioning insertion seal. The electrical submersible pump unit includes a cable, a cable head, a monitoring short joint, a micro motor, a micro protector, and a micro electrical submersible pump, which are connected in sequence from top to bottom; no cable penetration process is required, saving on-site operation time and enhancing the reliability of the system.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions, including:

[0005] A test tubing string, which is used to be lowered into the casing and cooperate with a test packer inside the casing to be seated and sealed inside the casing;

[0006] A sealing cylinder, which is arranged on the inner wall of the lower part of the test tubing string;

[0007] An electrical submersible pump unit, which includes a cable, a cable head, a monitoring short joint, a micro motor, a micro protector, and a micro electrical submersible pump, which are connected in sequence from top to bottom. The cable head is electrically connected to the micro motor, and the shaft of the micro motor is connected to the micro electrical submersible pump; the electrical submersible pump unit is used to be lowered into the test tubing string;

[0008] A positioning insertion seal, which is arranged below the micro electrical submersible pump and is used to cooperate with the sealing cylinder to seat and seal the electrical submersible pump unit inside the test tubing string.

[0009] Preferably, a weight and length matching tubing string is arranged below the positioning insertion seal.

[0010] Preferably, the cable is a high-strength three-phase AC pipe-packaged cable dedicated to electrical submersible pumps; the cable head is a three-phase quick plug connector.

[0011] Preferably, the monitoring sub-section is integrated with the micro-motor; a temperature sensor, a pressure sensor, a voltage sensor, a current sensor and a vibration monitoring sensor are integrated inside the monitoring sub-section.

[0012] Preferably, the micro-motor is a micro permanent magnet three-phase synchronous motor.

[0013] Preferably, the micro electrical submersible pump is a centrifugal pump.

[0014] Preferably, the weight and length matching pipe string is threadedly connected with the positioning insertion seal; the micro electrical submersible pump is flange-connected or threadedly connected with the positioning insertion seal; the micro protector is flange-connected with the micro electrical submersible pump; the micro-motor is flange-connected with the micro protector.

[0015] The beneficial effects of the present utility model are as follows: a test pipe string, a sealing cylinder, an electrical submersible pump unit and a positioning insertion seal are provided. The electrical submersible pump unit includes a cable, a cable head, a monitoring sub-section, a micro-motor, a micro protector and a micro electrical submersible pump which are connected in sequence from top to bottom; there is no need for a cable crossing process, saving on-site operation time and enhancing the reliability of the system. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of a micro electrical submersible pump device for well testing operation of the present utility model.

[0017] Figure 2 It is a schematic diagram of the principle of a micro electrical submersible pump device for well testing operation of the present utility model. Detailed Embodiments

[0018] The following further elaborates on the utility model in conjunction with the drawings, so that those skilled in the art can implement it with reference to the text of the specification.

[0019] It should be understood that terms such as "having", "including" and "comprising" used herein do not exclude the presence or addition of one or other elements or their combinations.

[0020] As Figure 1-2 shown, a micro electrical submersible pump device 1 for well testing operation of the present utility model includes:

[0021] The test pipe string 110 is used to be lowered into the casing 2 and cooperate with the test packer 210 in the casing 2 to be set in the casing 2;

[0022] The sealing cylinder 111 is arranged on the inner wall of the lower part of the test pipe string 110.

[0023] The electric submersible pump unit includes a cable 120, a cable head 130, a monitoring nipple 140, a micro motor 150, a micro protector 160, and a micro electric submersible pump 170, which are connected in sequence from top to bottom. The micro motor 150 is electrically connected to the micro electric submersible pump 170; the shaft of the micro motor 150 is connected to the micro electric submersible pump 170; the electric submersible pump unit is used to be lowered into the test string 110.

[0024] A positioning insert seal 180 is arranged below the micro electric submersible pump 170 and is used to cooperate with the seal barrel 111 to set the electric submersible pump unit in the test string 110. As a preference, a weight and length matching pipe string 190 is arranged below the positioning insert seal 180.

[0025] During use, first connect the seal barrel 111 to the test string 110 and lower it into the downhole casing 2 in advance. The test string 110 cooperates with the test packer 210 in the casing 2 to be set in the casing 2; then lower the electric submersible pump unit. The positioning insert seal 180 cooperates with the seal barrel 111 to seal the pipe string below the seal barrel 111. After the cable 120 is energized, the micro motor 150 starts and generates a high-speed rotational motion, driving the micro electric submersible pump 170 to rotate at a high speed. The liquid in the casing 2 enters the electric submersible pump unit from the suction port of the lower weight and length matching pipe string 190 under the action of centrifugal force, and is discharged from the discharge port at the upper part of the micro electric submersible pump 170 and then enters the annulus between the electric submersible pump unit and the test string 110. Under the continuous lifting action of the micro electric submersible pump 170, it is lifted to the wellhead. During the whole process, the monitoring nipple 140 is used to monitor the downhole temperature, pressure, voltage, current, and vibration parameters in real time.

[0026] In another embodiment, a weight and length matching pipe string 190 is arranged below the positioning insert seal 180.

[0027] In another embodiment, the cable 120 is a high-strength three-phase AC pipe-packaged cable dedicated to the electric submersible pump; the cable head 130 is a three-phase quick connector.

[0028] In another embodiment, the monitoring nipple 140 and the micro motor 150 are integrated into one; a temperature sensor 141, a pressure sensor 142, a voltage sensor 143, a current sensor 144, and a vibration monitoring sensor 145 are integrated inside the monitoring nipple 140.

[0029] In another embodiment, the micro motor 150 is a micro permanent magnet three-phase synchronous motor.

[0030] In another embodiment, the micro electric submersible pump 170 is a centrifugal pump.

[0031] In another embodiment, the counterweight and length-adjusting pipe string 190 is threadedly connected to the positioning and inserting seal 180; the micro electrical submersible pump 170 is flange-connected or threadedly connected to the positioning and inserting seal 180; the micro protector 160 is flange-connected to the micro electrical submersible pump 170; and the micro motor 150 is flange-connected to the micro protector 160.

[0032] In summary, the micro electrical submersible pump device 1 for well testing operation of the present utility model is provided with a test pipe string, a sealing cylinder, an electrical submersible pump unit and a positioning and inserting seal. The electrical submersible pump unit includes a cable, a cable head, a monitoring nipple, a micro motor, a micro protector and a micro electrical submersible pump, which are connected in sequence from top to bottom; there is no need for a cable crossing process, saving on-site operation time and enhancing the reliability of the system.

[0033] Although the embodiments of the present utility model have been disclosed as above, it is not limited to only the applications listed in the description and embodiments. It can be fully applied to various fields suitable for the present utility model. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and their equivalents, the present utility model is not limited to the specific details and the illustrated examples herein.

Claims

1. A micro electrical submersible pump device for oil testing operation, characterized in that, Comprising: A test string, which is used to be lowered into the casing and cooperate with a test packer in the casing to be set in the casing; A seal cylinder, which is arranged on the inner wall of the lower part of the test string; An ESP unit, which includes a cable, a cable head, a monitoring sub, a micro motor, a micro protector and a micro ESP connected in sequence from top to bottom. The cable head is electrically connected to the micro motor, and the shaft of the micro motor is connected to the micro ESP. The ESP unit is used to be lowered into the test string; A positioning insertion seal, which is arranged below the micro ESP and is used to cooperate with the seal cylinder to set the ESP unit in the test string.

2. The miniature electric submersible pump device for well testing operations according to claim 1, characterized in that: A weight and length matching pipe string is arranged below the positioning insertion seal.

3. The miniaturized electric submersible pump device for well testing operations according to claim 1, wherein: The cable is a special high-strength three-phase AC pipe-packaged cable for ESP; the cable head is a three-phase quick plug-in type master bushing.

4. The miniaturized electric submersible pump device for well testing operation according to claim 1, characterized in that: The monitoring sub is integrated with the micro motor; a temperature sensor, a pressure sensor, a voltage sensor, a current sensor and a vibration monitoring sensor are integrated inside the monitoring sub.

5. The miniaturized electric submersible pump device for well testing operation according to claim 1, characterized in that: The micro motor is a micro permanent magnet three-phase synchronous motor.

6. The miniaturized electric submersible pump device for well testing operation according to claim 1, wherein: The micro ESP is a centrifugal pump.

7. The miniaturized electric submersible pump device for well testing operation according to claim 2, wherein: The weight and length matching pipe string is connected to the positioning insertion seal by threads; the micro ESP is connected to the positioning insertion seal by a flange or threads; the micro protector is connected to the micro ESP by a flange; the micro motor is connected to the micro protector by a flange.

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