SU1133378A1 - Plugging apparatus - Google Patents

Abstract

{. SQUARE DEVICE, which is lowered on logging cabal, consisting of upper and lower cylinders, telescopically connected to one another, respectively) with an axial channel blocked by an electromechanical valve and a rod placed concentrically with the lower cylinder, an air chamber and a rubber plug overlapping the lower part the lower cylinder, which means that, in order to simplify the construction of the device, the piston is placed in the lower part of the upper cylinder, the rod is made of floors; it is rigidly connected in the lower part with the lower cylinder and locked The material is placed between the lower cylinder and the hollow rod, and the upper cylinder in the non-working position is marked with the middle element relative to the lower cylinder and filled with the cement material. 2. The device is up to claim 1, about tl and is often so that in order to increase the reliability of the operation of the device due to the tight installation of the rubber stopper, it is equipped with a shank for an elastic rubber stopper. & e cae so eo

Description

1 The invention relates to the mining industry, and more specifically to the oil and gas production, and can be used in well workover and technological operations to enhance oil recovery for installation in the wellbore plugs, block valves and others using elastic overlapping elements and hardening material. A grouting device containing a scrape, for cement slurry with an elastic blocking plug, is known in the hollow stem. The working body of the projectile consists of two air-filled chambers separated by a piston, which is connected to the hollow rod by means of a shaft, and the rod is connected to an elastic plug. Inclusion mechanism of the shock type has a razarayatuto sleeve and the anvil. Snar d - lowered into the well on the cable. After the projectile is lowered to the required depth, a weight is lowered into the borehole, which hits the anvil and destroys the sleeve and opens the channel in. cavity air chambers. Under the action of hydrostatic pressure, the piston creates a force on the drip plug transmitted by the shaft and rod, squeezes it into the well, and the cement slurry is discharged onto the plug from the choke m. However, the operation and operation of the device is not reliable and is not monitored, which reduces the effectiveness of its application. The device also has a small projectile capacity with large dimensions of the structure, only one third of the total volume of the device and is used for grouting material and the remaining 2/3 of the volume are air chambers. At the same time, it is impossible to install bridges in wells, where the diameter of the barrel is much larger than the diameter of the device itself, as it is not structurally provided for in the tunnel to allow large diameter plugs to be delivered to the well. In addition, due to the large size of the structure, it is not reliable in operation. The closest to the invention is a tamping device, descended on a wireline cable, consisting of upper and lower cylinders, 82 telescopically connected to each other, a piston with an axial Channel blocked by an electromechanical channel. and a rod placed concentric with the lower cylinder, the air chamber and the rubber of the plug overlapping the lower part of the lower cylinder 2J. A disadvantage of the prior art is the complexity of the design. The purpose of the invention is to simplify the design, as well as improve the reliability of the device due to the tight installation of the rubber stopper. Delivered; The goal is achieved by the fact that in a tamping device, descended on a logging cable, consisting of upper and lower cylinders, telescopically connected to one another, a piston with an axial channel blocked by an electromechanical valve and a rod located concentrically to the lower cylinder, air- The chamber and the rubber stopper, which overlaps the lower part of the lower cylinder, the piston is placed in the lower part of the upper cStyndr, the rod is made hollow, rigidly connected in the lower part with the lower cylinder and filled with cementing material. The shower chamber is located between the lower cylinder and the hollow rod, and the upper cylinder in the off position is fixed relative to the lower cylinder by the middle element and filled with cementing material. In addition, the device is equipped with a replaceable shank for an elastic rubber stopper. Figure 1 shows the device, a general view; figure 2 - scheme of the device. The device consists of the upper 1 and lower 2 cylinders, which are telescopically connected to one another, hermetically sealed by self-sealing cuffs 3, rigidly connected to the lower part of the lower cylinder 2 of the hollow stem D. The hollow stem 4 forms the air chamber A with the lower cylinder 2 in which pressure is equal to atmospheric. The cavity In the hollow stem 4 is filled with grouting material. In the lower part of the upper cylinder 1 there is a piston 5 with an axial channel blocked by an electromechanical valve 7 with a seat 8 separating the cavity B of the stem 4 from the cavity B of a high pressure

The one formed in the upper cylinder 1. The electromechanical valve 7 is connected to the actuator of the cable 9 of the command device located at the wellhead and constitutes the control circuit of the device. The device also consists of a shank 10, which is a hollow coius, onto which a rubber stopper 11 of the calculated size is pressed in to cover the well, the return valve; The valve 12 maintains the pressure in cavity B, equal to the pressure of the wells to facilitate the operation of the valve 7, the shear element 13 of the lower cylinder 2, the differential valve 14, the sub 15 connected to the tube 16.

The device is charged before descending. The shank 10 is pre-pressed elastic rubber stopper 11 is wrapped on the cylinder. Diameter

plugs 1 1 should be Ftsr F5ts + 10 mm, where j.g is the internal diameter of the well.

The height of the plug, 2 F. Cavity B and C are filled with the cement mix, valve 7 is closed. The device is connected to the logging cable and, using a winch, is lowered to the bridge installation interval.

The device works as follows.

As the device descends, pressure acts on it, the value of which is equal to .h, where C is the specific gravity of the well fluid, B is the depth of the descent of the device.

Axial compressive force, the value of which is equal to Р LРми where is the outer diameter of the cylinder 1, due to the presence of the air chamber A is transmitted through the hollow rod and the piston to the cement mix and creates pressure in the cavity B equal to

one

p ftpib.ll.

st T

 .Plbh

where Pg is the pressure in the cavity B;

D - inside diameter of cylinder

pal. Pg is always greater than l P,

2

because - i. "N

Since the cement mixture is not compressible, cylinders I and 2 remain in place. When the bridge installation interval is reached, an electrical current is applied to the drive of the electromechanical valve 7 through the logging cable, which communicates the cavities B and

The plugging mixture, which is located in cavity B, flows into cavity B, where the pressure is equal to P, creates a pressure equal to PgJ, which pushes the elastic rubber plug 11, and the cement mixture is squeezed out behind it. The accuracy of the bridge installation is equal to the accuracy of measuring the length of the logging cable and can be ensured up to several centimeters. When the pressure in the cavity C with the hydrostatic pressure of the well is equalized, the differential valve opens in the process of raising the device cavity B and B to Ibc,

The device allows to compare the known consumption of cement material by eliminating its mixing with the well fluid, allows materials with high adhesion properties to be used in the cement mixture, allows you to install a rubber plug in the wellbore with a diameter much larger than the diameter of the device itself. the volume of the lowered tampazhazhny mix in one flight increases with a decrease in the dimensions of the device itself, which reduces the number of trips, the reliability of operation of the mouth is increased oystva by simplifying the design.

BUT

m

7

, 5-2kgs / s #

F1lg.

Claims (2)

. 1. TUMPING DEVICE, lowered on a logging cable, consisting of upper and lower cylinders, telescopically connected to each other, a piston with an axial channel blocked by an electromechanical valve and a rod placed concentrically to the lower cylinder, an air chamber and a rubber plug overlapping the lower part of the lower cylinder, which entails the fact that, in order to simplify the design of the device, the piston is located in the lower part of the upper cylinder, the rod is hollow, rigidly connected in the lower part with the lower cylinder and filled cementing material, while the air chamber is placed between the lower cylinder and the hollow rod, and the upper cylinder in the idle position is locked away from the lower cylinder by the middle element and filled with cementing material. 2. The device according to π.1, characterized in that, in order to increase the reliability of the device due to the sealed installation of the rubber stopper, it is equipped with a shank for the elastic rubber stopper.