RU194160U1 - Deep sampling device - Google Patents

Abstract

The utility model relates to the oil and gas industry, in particular to the technique of sampling liquid and gas in wells. An urgent problem is the planned sampling of conditioned samples of petroleum products without stopping the production process. It is known that to ensure the condition of the sample, sampling should be performed in the well. The production equipment installed in the well forces the use of devices for sampling deep samples of small diameter. The objective of the utility model is a small-diameter device (not more than 30 mm) for taking deep samples in wells with installed equipment for oil product extraction.

Description

The utility model relates to the oil and gas industry, in particular to the technique of sampling liquid and gas in wells. An urgent problem is the planned sampling of conditioned samples of petroleum products without stopping the production process. It is known that to ensure the condition of the sample, sampling should be performed in the well. The production equipment installed in the well forces the use of devices for sampling deep samples of small diameter.

The objective of the utility model is a small-diameter device (not more than 30 mm) for taking deep samples in wells with installed equipment for oil product extraction.

Known RF patent No. 2344290, describing a sampler of the suction type. The disadvantage of this patent is the large diameter of 38 - 42 mm., As well as the presence of a ballast chamber. If you count the design by a diameter of 30 mm, the length will significantly increase up to 3 - 4 meters, which creates difficulties in operation, especially when descending into the well.

Known RF patent No. 2265123, describing a flow-type sampler. The disadvantage is the high degree of contamination of the deep sample. There are designs of this type with a diameter of 30 mm and a length of 2.5 meters. Nevertheless, it is difficult to run a device of this length into the well between the production string and tubing. Jams and, as a result, equipment failure are possible. The problem is solved:

1) the use of a suction-type sampling chamber, as the most progressive method for taking in-depth samples;

2) rejection of the ballast chamber;

3) the inclusion of a pump device.

There are a number of patents of the Russian Federation 2371577, 2465457, 2686885 using sample reception chambers and pumps. The disadvantage is the large dimensions of the devices, since they are designed in the early stages of work in wells.

The proposed device is shown in Fig. 1: 1 — inlet channel, 2 — pump check valve, 3 — space under the piston, 4 — pump piston, 5 — pressure compensation openings, 6 — sealed sampler case, 7 — control module, 8 electric drive. 9 - hermetic seal, 10 - rod, 11 - borehole fluid supply channel, 12 - valve body of the intake chamber, 13 - check valve of the intake chamber, 14 - magnet, 15 - medium separation piston, 16 - supporting sleeve, 17 - calibrated cylinder, 18 - flashlight, 19 - leaky sampler body, 20 - hole.

In Fig. 1, a device for sampling in-depth samples is shown in a state ready for launching into the well. The medium separation piston 15 is adjacent to the valve body of the sampling chamber 12 and held in this position thanks to the magnet 14 despite jerks and vibrations accompanying the descent of any device into the well. Upon reaching the point of sampling a deep sample using the control module 7, the electric actuator 8 forces the rod 10 to reciprocate, which is transmitted to the piston of the pump 4. The rod 10 is rigidly mounted on the piston of the pump 4. For reliable operation, the electric actuator 8 is installed in a sealed housing of the sampler 6, and the rod 10 is protected by a hermetic seal 9. The holes of the pressure compensation 5 in the leaky housing of the sampler 19 are designed to freely move the piston of the pump 4. When the piston of the pump 4 moves uphole the bone enters the inlet channel 1, then through the non-return valve of the pump 2 into the space under the piston 3. When the piston of the pump 4 moves downward, the liquid from the space under the piston 3 through the supply channel of the borehole fluid 11 enters through the non-return valve of the sample chamber 13 into the space bounded by the medium separation piston 15 , a calibrated cylinder 17 and the valve body of the sample chamber 12. For a few reciprocating movements of the piston of the pump 4, the sample chamber is filled, while the medium separation piston 15 is supported and the support sleeve 16. The wellbore penetrated by the medium separation piston 15 exits through the hole 20. The process of sampling completion is easily fixed both by the number of reciprocating and translational movements of the pump, and by the current consumption of the electric drive 8. The proposed design eliminated the second check valve of the pump , the function of which is performed by the check valve of the sampling chamber 13, which further reduced the length of the device. It should be noted the time of taking a deep sample. Table 1 shows the comparative results of different suction type samplers with the same sample chamber volume of 300 cubic meters. cm and a pressure of about 30 MPa.

In working with the customer, claims have been made more than once about the quick filling of the sampling chamber, which leads to a higher gas content in the deep sample. This was noted in the above two prototypes. In the proposed device, as can be seen from the table, these claims can be removed. After removing the device from the well, the valve body of the sample chamber is disconnected from the leaky body of the sampler 19, as well as the lamp 18 is disconnected from the calibrated cylinder 17 and the sample chamber is sent for analysis. It was possible to create a device for sampling deep samples with a diameter of 30 mm and a length of 1.6 meters, capable of operating at pressures of up to 100 MPa. The sample volume is 300 cubic meters. cm.

Claims (1)

Device for sampling deep samples, consisting of a sampling chamber, including a calibrated cylinder, a housing with a non-return valve and a medium separation piston, a housing including a pump, consisting of a rod, piston, check valves, control electronics and an electric drive, characterized in that the housing of the sampler contains a sealed and parts that are open to the borehole fluid, a sampling chamber is attached to the leaky housing of the sampler, control electronics and an electric drive are located in the sealed part, connected to a rod, which is connected through a tight seal to a piston located in an unpressurized part of the sampler housing, the space under the pump piston is hydraulically connected to a pump valve communicating with the well fluid and to a sample chamber valve communicating with a deep sample limited by the sample chamber valve body , a calibrated cylinder and a medium separation piston, wherein the medium separation piston contains a magnet.

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