SU836338A2 - Device for cementing flush casing strings - Google Patents

Description

I

The invention relates to the field of drilling of oil and gas wells, and the pipelines to devices for cementing the blind casing strings.

According to the main author. St. hfe 571585, a device for cementing casing strings is known, which consists of a disconnector with a nozzle, a piston, and separating plugs. Moreover, the nozzle and the piston are made with side windows and the piston in the nozzle is re-substituted above the elastic pin I3

A disadvantage of this device is that it is not possible to use bottom separation plugs when cementing the casing of the casing. This reduces the quality of a & b (orientation.

The purpose of the invention is to increase the quality of cementing.

This chain is achieved that the device for cementing the casing blind columns is provided with an additional plug located in the pag

The piston and the retainer position of the piston installed between the traffic jams, and in the piston above the side windows, additional side windows are made at a distance of equal to the piston stroke to the retainer.

Such an embodiment of the device permits the use of upper and lower separating plugs, and the presence of a piston retainer provides an indication of the moment when the lower plug is ejected; devices in a secret casing string.

FIG. I - device obdly view; in fig. 2 - the same, at the moment when the lower plug leaves the casing / in FIG. 3 the same, at the time of the upper tube in the casing.

Claims (1)

The device for cementing the casing blind columns contains a pipe I, rigidly connected to the separator 2, on which the casing 3 of the casing pipes (casing liner) is suspended. Nozzle I has 38 Neither end of bead 4 to limit movement of piston 5, secured to nozzle t with shear element 6. The top of piston 5 is completed in the form of sleeve 7. In piston 5 there are two Rus of side windows 8 and 9, the lower of which is coBMiesaeH with side The windows 10 of the nozzle I. In the nozzle t below the piston 5 there are elastic separable helical puffs: upper II and lower 12. Between the plugs II and 12 in the nozzle I, I will install the fixture 5, clamped in the ring 13, reinforced with shear pins 14. The device is lowered into the well on the drill pipe 15. After washing the well ins drill pipe is lowered elastic stopper 16, and after evacuation of solution 1entnogo q - schyubku 17. The apparatus operates as follows. After descending the secret column 3 of the casing pipe to the required depth and flushing the well, the elastic tube 16 is inserted into the brown pipe 15 (see Fig. 2) and cement mortar is pumped before receiving the Stop signal alert) that the elastic plug 16 has entered the piston 5 and blocked side windows 8. By increasing the pressure, I cut off the elements 6 and the piston 5 goes down before landing on the latch position 13. Clow down and the piston moves the plug 11 to the place of the lower plug 12, and the latter is pushed into the casing 3. the windows 9 of the pistons 5 are aligned with the side windows of the Yu pipe I, since the stroke of the piston 5 to the clamp 13 is equal to the height distance between the domes of the side windows 8 and 9 of the piston 5. Through the side windows 9 and Yu, the cement mortar begins to flow from the inner cavity of the device into the annular channel formed by the outer surface of the nozzle t and the inner surface of the secret column 3. Under the pressure @ 1 of cement mortar Ш1, the separating plug 12 begins to move VSH13 ds when it enters into the ring. For this purpose, a stop ring is used in the arrangement of the casing 3, allowing the use of the lower plugs as well. After pumping out the cement slurry, an elastic plug 17 is inserted into the drill pipes and a squeeze fluid is pumped in until a second stop signal is received (see Fig. 3), indicating that the plug went into the piston 5 and blocked the upper cross of the side windows 9, by means of increased pressure cuts off elements 14 securing the retainer 13 of the piston 5, the latter descends downward instead of with the retainer 13 before landing on the collar 4. Clown down, the propeller 5 pushes the upper separation plug II from the nozzle I into the secret column 3. In the lower position the piston 5, side windows 10 of nozzle I open and the squeeze fluid begins to flow from the internal cavity of the device into the annular space between nozzle I and casing 3. Under the influence of squeezing fluid, the stopper II begins to move along the secret column 3 before it enters the retaining ring, what a resistive increase in pressure indicates. After the cementing is completed, the disconnector 2 is disconnected from the standpipe 3 and the device is removed on the drill pipe 15 from the well. After appropriate reassembly device. The property can be reused, for which it is necessary to remove the auxiliary plugs 16 and 17 and insert separating plugs 11 and 12 inside the tube. The use of the device allows to improve the quality of well fixing in secret, columns, which are lowered both by shanks and sections. cementing and reliable separation of the cement slurry at the lower boundary from the drilling mud reduces the costs of fixing the wells in secret columns. The invention The device for cementing the casing blind columns according to ed. St. No. 571585, characterized in that, in order to improve the quality of cementing the secret column, it is provided with an additional elastic stopper located in the nozzle and a piston position lock installed between the plugs, and additional windows are made in the piston above the side windows equal to the stroke of the piston to the latch. Sources of information taken into account under I. USSR Author's Certificate NJ 571585, cl. E 21b 33/14, 1975. 6 J S / ft / J / 2 phage / -IS // / ff fug.