SU939749A1 - Multicycle shut-off valve - Google Patents

Description

one

The invention relates to the oil and gas industry, namely, well testing equipment.

A multi-cycle shut-off valve is known that allows an unlimited number of recording cycles of the pressure recovery curve. In this case, the assessment of the information recorded by the depth gauge can be carried out only at the end of the work l.

A well-known multi-cycle shut-off valve for testing wells using remote depth gauges, lowered into the study area on the cable, consists of mounted with the possibility of mutual axial movement of the hollow core, the stem placed inside the body and the overlapping element 12}.

However, in the process of recording the recovery curve (pressure pressure at significant pressure drops on the valve body), permanent deformations of the elastic element occur, which leads to a decrease in the diameter of the axial channel, difficult removal of the trunk (x devices from the well and leads to destruction of the element, and therefore , and the need to lift the tool to the surface to replace the element.

ten

The aim of the invention is to improve the performance of the shut-off valve when using a sealing head rigidly mounted on the cable as a closing element and with a significant pressure drop.

The goal is achieved by the fact that the housing has a stop outlet on which a removable sealing sleeve with a retainer is installed under the closing element, while the housing has openings.

a stem and bushing - grooves for bushing retainer.

Fig. 1 shows the valve in a stretched position before the start of packing, the general view; in fig. 2 - valve in a compressed position when conducting research during the period of inflow of formation fluid.

The multi-cycle shut-off valve consists of body 1, stem 2, spring 3 supporting the valve in extended position, chamber k connected by radial channels 5 to the annulus, and chamber connected by radial channels 7 to in-line space to form a hydraulic balancing unit the action of the force ejector on the rod 2 (the system is hydraulically balanced under the condition D Вд - D). On stock 2 and body

1 there are radial channels 8 and 9 which form a bypass channel for equalizing pressure above and below the removable sealing sleeve TO. The sleeve 10 has a sealing ring 11,

and the housing 1 has holes 12, the rod

2 is provided with a larger 13 and smaller Ø annular grooves for the ball clamps 15 and has a cylindrical surface 16 for the seals 11 of the sleeve 10. The sleeve 10 has the grooves 17. The clamps 15 freely move inwards in the radial direction for a distance equal to 1/3 of the diameter of the ball. In addition, on the inner surface of the housing 1 there is a stop protrusion 18 for fitting the removable sleeve 10. On the logging cable 19, a sealing head 20 is attached, provided with a mechanical seal 21 and a stuffing sealing 22, sealing the head 20 with a guide 23 relative to the cable 19.

Multi-cycle shut-off valve operates as follows.

A multi-cycle shut-off valve is installed above the test instrument kit, which has a through axial passage for the passage of instruments. During the descent process, the valve is in the extended position due to the hydraulic balancing assembly, and the minor tool landings are compensated by the spring 3.

Upon reaching the specified interval. before packing, i.e. while the valve is in the extended position, in the well filter zone below the valve

5, the downhole cable is lowered on the logging cable 19 with a sealing head 20 installed above it and a loose sleeve 10, while the head 20 passes through the valve and the sleeve 10 is retained on the ledge 18 of the housing 1,

In the process of packing under the influence of axial load from the weight of the overhead pipes exceeding the force of the spring 3, the shut-off valve is compressed, and first the rod 2, displaced relative to the housing 1, with its groove H moves the ball catches 15 into the cylindrical groove 17

0 sleeve 10 and holds the sleeve 10 relative to the housing 1. With further displacement of the rod 2 seals 11 are installed in the area bounded by the cylindrical surface 16.

After opening the inlet valve of the formation tester, the formation fluid flowing into the interior of the pipes passes through the annular gap between the cable 19 and the sleeve 10.

During the inflow process, a logging instrument can be performed, and to record the pressure recovery curve, the head 20 is lifted

 the cable 19 is inserted into the sleeve 10 and with the end seal 21 closes the axial channel. The guide 23 enters into the sleeve 10 with a minimum clearance, which allows the seal 21 to withstand significant pressure drops without residual deformations. To re-open the valve, the tool is tensioned, the seal 11 comes out of contact

 with the surface 16 and through the channels 8 and 9, the pressure above and below the sleeve 10 is equalized, while the axial load from the spring 3 provides the open position of the inlet valve of the formation tester, and ka (5el 19 can move relative to the shut-off valve.

After subsequent compression of the check valve, the next cycle of the pressure recovery curve can be recorded.

Claims (2)

In the event of failure of the cycle of the pressure recovery curve, in the event that the seals 11, 21 and 22 break down after numerous loading of the shut-off valve without lifting the tool to the surface, they are replaced by removing the logging tool together with the sleeve 10 and the sealing head 20. work. The use of a multi-cycle shut-off valve with a more reliable shut-off organ will allow long-term studies of productive formations with significant pressure drops and eliminate frequent ascents of the test tool caused by the destruction of the seals in the shut-off organ, which during the selective testing of several objects by one descent will lead to significant savings in time and material . The invention has a multi-cycle shut-off valve for testing wells using 9 remote depth gauges lowered into the study area on the cable, consisting of mounted with the possibility of mutual axial movement of the hollow body, the rod placed inside the body and the overlapping element, characterized in that the purpose of improving the reliability of the shut-off valve when using a sealing head fixed on a cable as a closing element and with considerable epade pressure body has a lip on which a removable sealing sleeve with a retainer for the closing member, wherein the housing has openings, and the rod and the sleeve - a sleeve retainer grooves. Sources of information taken into account in the examination 1. Sukhonosov GD Open hole test. M., Nedra, 1978, p. 69 2. USSR author's certificate on application no.2707857, cl. E 21 B, 1979 Gprotioty).