SU909128A1 - Device for cementing flush casings - Google Patents

Description

one

FIELD OF THE INVENTION The invention relates to the oil industry and the water supply and can be used in the cementing of the blind casing.

A device for cementing blind casing strings is known, which includes a sleeve, a suspension assembly, a tubular rod, and a seal 1.

The disadvantage of the device is the possibility of the ball hanging in the drill pipe, which can lead to the exposure of the casing shoe.

Closest to the proposed " is a device for cementing the blind casing strings including a sleeve, a left nut, a tubular rod with a t2l seal.

A disadvantage of the known device is that the failure of the non-return valve disrupts the cementing process, as well as the impossibility of monitoring the cementing process.

The purpose of the inventions is to increase the reliability of the device operation by making it possible to control the disengagement process.

 This goal is achieved by the fact that the stem and the nut are made with interacting splines at the upper position of the stem, and the latter is plugged at the bottom and has radial holes.

The rod is made with radial bearing fingers, and the coupling - with shaped grooves under the fingers.

FIG. 1 shows the device in the position corresponding to the descent

15 casing, washing it with a solution, pumping cement and calculated (in, the amount of drill pipe) squeezing solutions; in fig. 2, section A-A in FIG. one; in fig. 3 .30 view B in FIG. 1 (the position of the bearing finger in the shaped groove); in fig. the device is in position when pushing cement mortar; in fig. 5 39 in FIG. i (the position of the bearing finger in the shaped groove). The device comprises a tubular rod 1, which is an advanced tip of a 2-pipe suspension string. Between the coupling (casing) 3 and the stem 1 there is a composite left gaika M with a sealing element 5, which interacts with the tubular rod 1 passing through it. The tubular rod 1 is blocked at its lower end by a stub 6, which has at its upper end slots 7; slots 7 correspond to the slots 8 on the lower end of the nut. The large joint is used to transmit the rotation from the suspended columns | on the left nut. At the same time, the nut 4 has a left-hand thread and is unscrewed from the casing 3 when mating the splines 7 and 8 and transmitting the rotation. On its side surface, the tubular rod 1 has radial holes 9 that connect the cavity of the casing 3 with the casing of the casing 2. The total area of the holes 9 ensures that fluids (cement and drilling mud) pass through them without additional resistance. In the rod 1, the radial bearing fingers 10 are symmetrically fastened, which are inserted into the shaped grooves 11, which are made on the side surface of the casing sleeve. Each of the shaped grooves 11 is made of two longitudinal displaced vertical umechik - top 12 and bottom 13 interconnected by a transverse section in such a way that the lower end of the longitudinal section 12 smoothly passes into section 1, and above the junction of the other end of section I with section 13 there is deadlock suit Section 12 of the figured groove (through) goes to the upper end of the coupling 3- On the outer surface of the coupling 3, the centralizers 15 are fastened, which ensure the centering of the casing head in the hole of the well. In the casing 16, a cement plug 17, made, for example, of rubber or other elastic material, is placed under the tubular rod 1. During the descent of the device, the plug 17 is placed between the groups of holes 18 and 19 in the casing, which are closed outside by an annular casing 20. The device operates as follows. A suspension consisting of a casing string 16 with a coupling 3 screwed on its upper end connected to the suspension string by means of carrying pins 10 is lowered into the well. The fingers 10 are placed in the figured grooves 11 of the coupling in dead ends of the grooves 13. Spline connection 7 -8 is open, and cement plug 17 is between holes 18 and 19 in the casing. The cavities of the casing and suspension columns are filled with flushing solution as the device descends. When the device reaches the casing installation interval, pressure in the pipes creates circulation of the washing solution through the lower end of the column. Next, pumped cement mortar and partially in the volume of the suspension column squeezing the liquid. Landing suspended column. In the hydrogeological wells, landing and casing strings are also carried out. When the tubular stem 1 is seated, the cement plug 17 moves downward until it closes the openings 19 in the casing. The pressure of the pump injecting the squeeze fluid provides further movement of the cementing plug 17 through the casing. After the injection fluid has been pumped and the pressure is obtained on the pressure gauge, the stop is restored. circulation For wells for oil and gas, the casing string is suspended on a wedge or thrust suspension device. For hydrogeological wells, a partial discharge of the weight of the casing string to the bottom is possible. Raise support column 2 while simultaneously applying a left-facing torque to it. This ensures horizontal displacement of the bearing fingers 10 along the intermediate sections of the shaped grooves 11. The holes 9 on the tubular rod fall into the area above the sealing element. The output of the bearing fingers 10 from the vertical sections 12 of the grooves 11 at the end face of the clutches 3 is marked by an increase in the load on the hook after lifting the suspension column. 2 at a predetermined known distance. This distance corresponds to the shift of the cementing plug 17 and is noted at the beginning of the unloading of the suspension string 2. In this case, an additional means of control is to restore the circulation of the solution at pressures lower than when circulating through the casing shoe.

In the circulation process, the head of the casing string is washed out of excess cement slurry. Circulation may be performed during the entire RPF period, but there must be no less than one flushing cycle. At the end of the RPT, turning the suspension string 2 to the right holds the lid of the stop nut i with the sealing element from the casing 16. Next, the suspension column 2 with the tubular stem 1 and the sealing element on it is removed from the well.

The use of the device makes it possible to reduce the accident rate during descending and cementing operations. secret casing strings and because of this increases the productivity of drilling operations.

Claims (2)

1. A device for cementing the blind casing strings, including a sleeve, a left nut, a tubular rod with a seal, characterized in that, in order to increase the reliability of the estimates, to ensure the control of the diversion process, the rod and nut are made with interacting splines at the upper position rod, and the latter is plugged from the bottom and has radial holes. 2. The device according to p. 1, about t l and -: that the tubular rod is made with radial bearing fingers, and the coupling - with figured grooves for fingers. Information sources, taken into account in the examination 1. Author's certificate of the USSR P 583283, cl. E 21 B 33/1, 197-5. 2. USSR author's certificate number 583282, cl. Е 21 В ЗЗ / 1t, 1976. (prototype). eight (Rig. G Zid (Rig.z Fig, 1