RU107276U1 - DEVICE FOR CLOSING VALVES OF THE DEPTH Sampler - Google Patents

Abstract

 A device for closing the valves of the sampler, containing two valves, a telescopic rod, a carriage with dogs, oil and ballast (air) chambers, separated by a hydraulic resistance unit to delay the closing of the valve in time, characterized in that the device contains two valves, of which the first valve is made spool with three rows of seals and mounted movably from the outside of a rod rigidly fixed to the housing having two rows of radial holes and connected by a telescopic rod to a piston installed in the oil chamber, and the second spool valve (pre-valve) is rigidly connected to the carriage and fixed to the housing from premature opening with a ball valve, and the hydraulic resistance unit is adjustable.

Description

The utility model relates to the oil industry, in particular to deep samplers used for sampling oil in order to use its properties in reservoir conditions.

A device for closing the valves of a deep sampler (RU 3638 U1 IPC 7 ЕВВ 49/08, 2003) is known. This device contains a carriage with slots in which pivotally mounted dogs are located. The carriage is mounted movably relative to the stem and is connected by a thrust to the slide valve. When the deep sampler goes down, the dogs, drawn by the springs, oscillate around their axes, describing the profile of the inner wall of the tubing (hereinafter tubing). When lifting, the dogs abut against the sleeve joint of the tubing and move downward relative to the stem, dragging the carriage along with them, the spool valve opens. While maintaining the stretch for a certain time, a breakdown of the chamber occurs. With a further increase in tension, the pin is cut off, rigidly connecting the carriage and the valve rod to the stem, after which the valve closes again under the influence of a spring. Dogs fold in the slots of the carriage. And then the carriage with the dogs lowers into the basket, without interfering with the upward sampling of the sampler.

This device has the following disadvantages:

- the complexity of accurate retention on the wire or cable of the downhole sampler with the valve open;

- the use of shear pins increases the preparation time of the deep sampler for work and the cost of spare parts.

A device for closing the valves of a deep sampler is known (a suction piston sampler VPP-300 of the Bugulminsky pilot plant "Nefteavtomatika" Operation manual BN.46-06 RE 2006 - Prototype).

This device includes body parts 1, 2, 4, 8, 10, 12. In the device inside the oil chamber 12 there is a movable piston 4 connected by a telescopic rod 5 with a fore valve 7 and a check valve 18. Between the ballast (air) chamber 2 and the oil chamber 12, the hydraulic resistance unit 3 is located in the form of a meter-long capillary tube, the check valve 18 being made in the form of a cone and spring loaded with a weak spring 21, the holes 6 for the inlet of the sample on which the filter is mounted are always open. When the sampler is lowered into the well, oil from the oil chamber 12 begins to flow through the hydraulic resistance block into the lower ballast chamber 2, as soon as even a slight pressure in the well begins to act on the piston 4, which is a significant drawback of this technical solution.

In addition, there are other disadvantages:

- under the check valve 18, made in the form of a cone, solid particles can fall during filling, which leads to non-closing of the valve;

- if a high-pressure oil sample is taken, it is very difficult to open a conical check valve for analysis;

- the hydraulic resistance block is made unregulated with a very long response time, so in wells with low pressure it takes about 2-3 hours to fill the receiving chamber, and in deep wells with high pressure and high temperature, the receiving chamber can be filled with a sample before the sampler will be lowered to a predetermined depth;

- there is no signal to fill the receiving chamber.

- the non-return valve is pressed to close with a weak spring, which does not always guarantee a tight valve closure.

The objective of the proposed technical solution is to expand the functionality and increase the reliability of the device for closing the valves of the deep sampler at any pressure of the well.

The problem is solved due to the fact that the device contains two valves, of which the first valve is made with a slide valve with three rows of seals and is mounted movably from the outside of a rod rigidly fixed to the body, having two rows of radial holes, and is connected by a telescopic rod with a piston mounted in an oil chamber, a carriage with dogs, oil and ballast (air) chambers separated by a hydraulic resistance unit to delay the valve closing by time, and another spool valve (fore valve) is rigidly connected to the carriages minutes and fixed on the casing from premature opening through the ball valve and hydraulic resistance unit is adjustable.

Figure 1 presents a device for closing the valves of the depth sampler as a whole.

Figure 2 - presents the claimed part of the device in an enlarged scale.

In general, the device includes a receiving chamber 1 connected to the ballast chamber 2 by means of an upper adapter 3, in which a time relay 4 with a screw 5 is mounted, fixed by a nut 6. Inside the receiving chamber 1, a movable piston 7 and a ball 8 are installed.

The inventive part of the device is connected to the sampling chamber 1 using the lower adapter 9. To the lower adapter 9 is rigidly connected to the rod 11 with two rows of radial holes "e", "e", on which the first slide valve 12 is mounted externally, having three rows of seals " Well. " The spool valve 12 is connected by a telescopic rod 27 with a piston 25 mounted in the oil chamber “c”. The oil chamber “c” and the ballast (air) chamber “g” are separated by a hydraulic resistance unit 26, and the hydraulic resistance unit is adjustable. The second spool valve 21, which is the inlet (pre-valve) includes several parts. It consists of a basket 13 with a cap 14, rigidly connected to the thread with the rod 15 and fixed by a screw 16. In the carriage 17 there are longitudinal slots in which the dogs 18 are located and pivotally mounted. The dogs 18 under the influence of the springs 19 tend to expand with increasing diameter, but this movement is limited by the ring 20. The carriage 17 is mounted movably relative to the stem 15 and is rigidly connected to an external spool valve (fore valve) 21, which is fixed from premature opening on the housing 22 by means of a ball valve 23. On the housing 24, ledge “a” is made, restricting the stroke of valve 21. There are radial holes “b” in the housing 24, which communicate with the receiving chamber 1 to the external space and are initially closed by a slide valve (fore valve) 21.

Depth Sampler Operation

Before the descent into the well, the receiving chamber is filled with engine oil, and the ballast chamber 2 and the ballast chamber “g” remain filled with air at atmospheric pressure. Spool valve 12 is in its highest (open) position. An in-depth sampler on a cable or wire is lowered into the tubing to a predetermined depth for sampling oil.

At the same time, pawls 18 pivotally mounted in the carriage 17 under the action of the springs 19 are constantly pressed against the inner walls of the tubing. When the sampler is lowered to a predetermined depth where the sample is to be taken, it begins to rise. When lifting, the dogs 18 abut against the sleeve joint of the tubing. At the wellhead, a short-term short wire tension will be fixed visually or with a device, which will indicate the beginning of filling of the receiving chamber 1. At the same time, the dogs 18 are shifted down relative to the rod 15, dragging the carriage 17 and the associated slide valve 21, then the dogs 18 are removed from the sleeve joint of the tubing, folding in the slots of the carriage 17 and go into the basket 13, holes "b" open and through them the oil begins to flow into the deep sampler. The receiving chamber 1 is filled through the central holes and the radial holes “e” and “e” made in the rod 11. As the receiving chamber 1 is filled with a breakdown of oil, the piston 7 moves up to the stop against the end of the upper adapter 3, displacing with resistance engine oil into the ballast chamber 2 through the timer 4. At the same time, under the pressure of the oil, the piston 25 moves down, displaces the oil from the oil chamber “c” through the hydraulic resistance unit 26 into the ballast chamber “g” and carries it away by means of bodies Eskopic rod 27 slide valve 12 down, toward the closing of the latter. The time switch 4 and the hydraulic resistance unit 26 are configured in such a way that the closing time of the slide valve 12 will be a multiple (3-5 times) longer than the filling time of the receiving chamber 1, which guarantees 100% filling of the receiving chamber with a representative sample of oil. An in-depth sampler with a sampled oil sample is removed to the surface with a closed slide valve 12, which closes the hole "e", that is, the sample in the receiving chamber 1 remains closed. An in-depth sampler is sent to the laboratory for research. In the laboratory, the ballast chamber 2 with the parts and the entire lower part, including the housing 24 and the nut 28 together with the stem 27, is disconnected from the sampler. The remaining receiving chamber with a fitting connected to the stem 11 is installed in the research unit, the temperature and pressure of which are brought to reservoir conditions and all the necessary studies of the selected oil sample are conducted according to the existing technology.

The solution to the technical problem is the constructive implementation of the device containing two valves, of which the first closing sample in the receiving chamber is made of spool with three rows of seals and is installed outside the rod rigidly fixed to the body with two rows of radial holes, which makes it much easier to control this valve during sampling and sample analysis in the laboratory. Moreover, the hydraulic resistance unit for delaying the closing time of the first spool valve is made adjustable, which reduces the time spent on sampling at low pressure in the well.

The second spool valve (fore valve) is rigidly connected to the carriage, fixed on the housing from premature opening with a ball valve, which ensures that the valve is opened only at the moment of engaging the dogs mounted on the carriage for pipe joints when lifting the sampler. This eliminates the unauthorized opening of the fore valve even in very deep wells.

Currently, bench tests have been carried out and a prototype prepared for testing in the well. Implementation is expected in the second half of 2011.

Claims (1)

A device for closing the valves of the sampler, containing two valves, a telescopic rod, a carriage with dogs, oil and ballast (air) chambers, separated by a hydraulic resistance unit to delay the closing of the valve in time, characterized in that the device contains two valves, of which the first valve is made spool with three rows of seals and mounted movably from the outside of a rod rigidly fixed to the housing having two rows of radial holes and connected by a telescopic rod to a piston installed in the oil chamber, and the second spool valve (pre-valve) is rigidly connected to the carriage and fixed to the housing from premature opening with a ball valve, and the hydraulic resistance unit is adjustable.