SU1493767A1 - Method and apparatus for cementing wells - Google Patents

Abstract

The invention relates to the mining industry. The purpose of the invention is to improve the quality of cementing wells by simultaneously eliminating gas saturation of the cement slurry and hydraulic shock during the process of forcing. Into the casing / OK /, the cement slurry is terminated with a density greater than the density of the drilling mud, and is forced out into the annulus of the well by squeezing fluid. The separation plug in the OK is started immediately at the end of the completion of the cement slurry. Between the separation plug and the squeeze fluid is placed a portion of air before the last feed. A device for implementing the method includes a housing / K / 1 with an emphasis 2 and lateral taps 3. An isolation plug / RP / 4 is installed on the stop 2 with the formation of an overcapsule 5 and a secondary part 6 chambers. A cover 7 is installed in K 1, and a crane 8 is installed in chamber 5. A bypass connection 9 is installed in a coaxial outer surface K 1, pneumatically connecting chambers 5 and 6. In K 1, a radial hole 10 is made opposite the crane 8. A crane 8 is installed with the possibility of simultaneous shut off the pipe 9 and the radial hole 10 K 1. In OK through the lateral taps 3 end the cement slurry. At the end of its injection, the overspout space is connected to the atmosphere, RP 4 moves after the cement slurry, and a portion of air is formed above RP 4. After washing the lines, the radial hole 10 is blocked. Through the lateral taps 3, a cement slurry is added. Placing RP 4 directly above the cement slurry eliminates saturation of the latter with air. The presence of a portion of air between the RP 4 and the squeezing fluid eliminates hydraulic shocks both during the process of forcing the cement slurry and at the time of its termination. 2 sec. f-ly, 2 ill.

Description

Set

mediated at the time of completion of the cement slurry. Between the separation plug and the marketable liquid, a portion of the nostril is stirred; - nrobovochnaya 6 ka.mer. In K 1, a cover 7 is installed, and 13 of chamber 5 is a crane 8. A circumferential pipe 9 is mounted axially to the outer surface of K 1, a pneumatic connection of chamber 5 and 6 is made pneumatically, and K 8 has a radio hole 10 opposite the edge a 8. The crane 8 is installed with the possibility of simultaneously blocking the nozzle 9 and the radial

10 k 1 mA and OK through side taps 3 pump the cement slurry, at the end of its injection, the overspout space is connected to the atmosphere, RP 4 moves after the grouting solution, and a portion of air is formed above RP A. After washing the lipium, the radial opening 10 is closed off. A side of the cement slurry is added through the lateral taps 3. Placing RP 4 directly above the tonnage solution makes it possible to exclude the latter being saturated with air. The presence of air pistons between RP 4 n squeezing fluid eliminates hydraulic shocks both in the process of forcing a pumping solution and at the time of its completion. 2 s, n. F1-ly, 2 an,

The invention relates to the mining industry, and more specifically to the oil and gas industry, and can be used in casing cementing.

The purpose of the invention is to improve the quality of cementing wells by simultaneously eliminating the gas pressure of the hydraulic fluid and hydraulic shock during its development.

Pa fpgo 1 scheme} ppu presents ycTpoi icTBO for well cementing, longitudinal section; in fig. 2 - ce ieniie LL in FIG. 1 o

The cyinHOCTb of the method consists in pumping a tamping into the casing string, the density of the solution, which is the density of the drilling mud, and displacing it into the casing nj JOCTpaHCTBO well with a liquid, while separating the plug into the casing starts directly at the moment of injection into the casing string at the moment of completion of the injection with the liquid, while separating the plug into the casing starts directly at the moment of injection into the casing string when the injection tube is injected at the end of the injection. P1 cement slurry, and between the separation plug and the squeezing fluid is placed a portion of air before the last feed

The device includes a housing 1 with an emphasis 2 1 side branches 3, a separating plug 4 installed on the stop 2 of the lateral branches 3 with the formation of the oversampling 5 and the subcapital 6 chambers, kraoka 7, rotary crane 8, turned out in the oversampling chamber 5, and a bypass pipe 9 installed coaxial1, but the outer surface 1 and the pneumatic and joint uish overmount 5 and subchisel 6 of the chamber o The body 1 is made with a radial hole 10 against the rotary crane 8, and the stop is made in the form of an annular ledge behind

one new :: with housing 1. The rotary valve 8 is installed with the possibility of simultaneously closing the bypass pipe 9 and opening the radial hole 10 of the housing 1.

The device works as follows

After the descent of the column, it is not installed a device, in the housing 1 of which a separator plug 4 is placed on the support 2 (Fig. 1 and 2). In the process of cementing, the oversampling 5 and the subsampling 6 chambers in the coopus are connected to each other by the bypass pipe 9c. This ensures that the

the stop 2 of the separation plug 4, since the pressures above and below the plug are equal. After the injection of the injected volume of the cement slurry, the rotary valve 8 is installed in

the position at which the bypass pipe 9 overlaps and opens the radial hole 10 "Under the action of its own weight, the column of cement slurry in the column is lowered, under

five

separation plug U almost instantly creates a vacuum and under atmospheric pressure it passes through the support 2 of the device and moves directly behind the cement slurry column. After washing the injection line, the radial hole 10 is closed and the squeezing fluid is fed into the column in the usual order.

It is advisable to start pumping the squeezing fluid into the casing after flushing the cement grout injection lines from the cement slurry residues from flushing

The amount of air that should be placed between the squeezing fluid and the separation plug depends on the flushing time of the pumping lines from the cement slurry remains. ..

Placing the separation plug directly above the cement slurry eliminates the latter's saturation with air, and the presence of a portion of air between the separation plug and the squeezing fluid eliminates hydraulic shocks both during the forcing of the cement slurry and at the time of its completion.

Claims (1)

1. Method of cementing wells, including injection into the casing of cement slurry raft 937676 greater than the density of the bored mortar, displacing it into the annular space of the well by pumping a squeezing fluid into the casing with preliminary placement between the last and cement slurry portions of air and the release of the separation plug is different in order to improve the quality of cementing wells by simultaneous} elimination of gas saturation of the cement slurry and hydraulic shock in the process 15, its separation plug is allowed into the casing immediately at the end of the injection of the tampon solution, and a portion of the air is placed between the separating plug and the liquid to be poured before it is supplied. 2 Device for cementing wells, including a housing with an emphasis 25 and lateral taps, a separating plug, mounted on the stop, pulling out lateral taps with the formation of a supra-cork and tamper chambers, and a cap that is different 0 in that it is equipped with a rotary valve placed in the overbinding chamber and a bypass connection installed coaxially to the outer surface of the housing and pneumatically connecting the overpressure and the cutting-through chamber, while the housing is made with a radial bore against the rotating crane, and the stop is in the form of an annular ledge in one piece with the body, Q wherein the rotary valve is installed with the possibility of simultaneous closing of the bypass pipe and opening the radial opening of the housing 35