RU1810501C - Device for lowering and cementation of liner - Google Patents

Abstract

Usage: cementing secret casing strings for fastening oil and gas wells. The inventive device for fixing the left thread of the device is made in the form of fingers with end bevels, the barrel, the coupling and the bell have coaxial radial windows for accommodating the fingers, the radial windows in the bell are made at an angle to the radius of the bell for the window wall to interact with the end bevels of the fingers, gold

Description

the nickel sleeve is made with a seat for a throw ball and mounted with the possibility of overlapping fingers, moreover flushing

the holes are located above the coupling.

FIELD OF THE INVENTION The invention relates to devices used for drilling wells for launching and cementing blind casing strings.

The purpose of the invention is to simplify the design of the device and increase its reliability in operation.

Figure 1 shows the complete assembly; figure 2 is a complete assembly when disconnecting the drill string of the drill pipe from the casing; in Fig.Z - section aa in Fig.1; in Fig.4 - section bB in Fig.2

A device for lowering and cementing countersunk casing strings includes a bearing barrel 1 with flushing holes 2 and a socket 3, interconnected by a left-hand thread 4 and a connecting sleeve 5, a spool sleeve 6 with a seat 7 for seating the ball valve 8, the lower and upper sections of the squeezing spacer plugs 9 and 10, respectively, and fingers 11, located in the windows 12-14, respectively made in the socket of the coupling and the barrel with the possibility of interaction of the fingers with the spool sleeve 6.

The bearing barrel 1 is connected to the thread with the drill string 15 and the socket is the 3rd blind casing 16. The lower section 9 of the separation plug is fixed on the barrel 1 on the shear pin 17 and the spool sleeve 6 on the pin 18. The flushing holes 2 are located on the barrel 1 above the coupling 5, the wall 19 of the window 12, interacting with the finger 11, is made at an angle to the radius, and the outer end of the finger with a reciprocal bevel 20.

A device for lowering and cementing blind casing works as follows.

The device assembly with the drill string 15 and the casing 16 is lowered into the well to the design depth with periodic turning in case of landings or puffs. In this case, the torque is transmitted from the drill to the collar through the barrel 1, fingers 11 and socket 3 ,

During cementing, the upper section 10 of the prodrug plug is introduced over the cement slurry into the launch column. This section freely passes through the spool sleeve and fits into the lower section 9. After that, the stud 17 is cut off and both sections of the plug are pressed, along the countersunk string to the Stop ring, and the grout is pushed out of the casing

the column, while the countersunk column is rotated in the same way as when it was lowered into the well. Then, ball 8 is thrown into the launch column, they are waiting for it to be placed on the seat 7, after which an additional pressure drop

the pin 18i is cut off from above, mixing the sleeve 6 down, the washing holes 2 are opened. Next, circulation is restored through these holes and the excess cement slurry is washed out of the well, raised above the countersunk column.

After the OZC, fingers 11 are first pushed into the inside of the device, by rotating the launch column to the right by the wall 19 of the socket window on the drift of the finger 20, and

then, after unscrewing the bearing barrel from the socket in the left threaded connection 4, the launching column with the released part of the device is raised to the surface. After resetting

The position of this part of the device can be used repeatedly for lowering and cementing other countersunk columns. The application of the invention will improve the reliability of the device in operation for

by eliminating the occurrence of spontaneous disengagement of the launch and casing strings when trying to rotate during cementing.

Claims (1)

The claims A device for lowering and cementing countersunk casing strings, including a bearing barrel with flushing holes and a socket connected between a left-hand thread, the upper and lower sections of the squeezing dividing plug, a spool sleeve for blocking the flushing holes, and a left-hand thread fixing unit containing a connecting a coupling, characterized in that, in order to simplify the design of the device and increase its reliability, the left-hand thread fixing unit is made in the form of fingers with end bevels, the barrel, the coupling and the socket have coaxial radial windows for accommodating the fingers, the radial windows in the socket are made at an angle to the radius of the socket for the window wall to interact with the end bevels of the fingers, the spool sleeve is made with a saddle under the throw ball and installed with the possibility of overlapping fingers in the original the position of the device, with flushing holes placed above the coupling. Riga 2. U6-6