SU1357546A1 - Apparatus for reverse cementing of casings - Google Patents

Abstract

The invention relates to the field of mining and is intended for the construction of oil and gas wells. The purpose of the invention is the expansion of the technological capabilities of the device. It contains a hollow body (K) 1 with upper and lower chambers made on its inner surface, a hollow movable sleeve (PV) 2 with upper a, middle b and lower in rows of radial channels and clamps of its upper and lower positions in the form of shear 1 types 7 and 8. In HB 2, a landing saddle 4 was made under a drop e, 1ms11T, equipped with a lock 9 of the intermediate position of TsV 2. In the K 1 part, there is a ratchet mechanism, v1p1Onnen1P) P1, in the form of a spring ring 5, installed in the K1 groove, and the collar grooves on CV 2 in its lower part. Against the average row of channels and bridges in P2, there is a chamber with a ball-shaped element (CE) 3 placed in the terminal. It alternately overlaps the top and bottom holes in the chamber. The density of material CE 3 is less than the density of the washing liquid. The diameter of the HPS 3 MeneP1e G1OLO of the height of the CV 2. The movement of MF 2 under the action of the pressure pressure and the rejection element CE 3. Initially set as the return for direct circulation of the fluid, is transferred to the forward position (for reverse circulation ). When performing the reverse cementing, the CE 3 is set to the reverse position. In the process of reverse cementing, you can, if necessary, implement. 1 rinse the columns. 3 il. / iS (L Soel a -vj sd 4 a:

Description

The invention relates to the mining industry, is intended for the construction of oil and gas wells and can be used in the construction of the annulus by the method of reverse cementing.

The purpose of the invention is to expand the technological capabilities of the device.

FIG. Figure 1 shows the device, the initial position, as a non-return valve for preventing fluid from entering the well into the descending column and for drying, prior to cementing the flushing of the column; in fig. 2 - the same as the direct valve

Before descending into the well in the housing 1 with a spacer 6 screwed into it, in which the shear upper 7 and lower 8 pins are installed, as well as the spring ring 5,

5, the sleeve 2 is assembled with the seat 4, the intermediate position lock 9, the ball 3, the gasket 10, rubber seals 11 against the upper shear pins, while the split spring ring 5 snaps into the recesses of the e seat. In such an initial position, the upper annular cavity r is aligned with the lateral upper channel b and the lateral lower channel b, the valve operates as a reverse for direct circulation.

for performing reverse cementing; {5 Liquid passes sequentially from above.

down from the upper part of the casing pipes E is the lateral upper channel b, the annular cavity r, the lateral channel c, and further into the lower part of the casing pipe.

in fig. 3 is the same as a non-return valve to prevent the cement slurry from flowing as well as the formation fluid into the column and, moreover, to discharge the column from internal pressure. The device includes a housing 1 with an upper and lower chambers made on its inner surface, a hollow movable sleeve 2 with upper, middle and lower radial channels a, b, c, a seating seat under the rejection element and an overlapping channel element 3 of a bore channel located inside the hollow movable sleeve, saddle 4, connected to the E tulk on the thread and fixed relative to the body with a ratchet

20 Before starting the reverse cementing, the cast-iron ball, which blocks the central channel, is dropped into the casing string. Creating a pressure of 3-4 MPa on ycTiie, shears the studs 7, moving the sleeve 2 with the saddle 4 to the stop with the lower shear pins 8, while the split spring ring, having passed the saddle below, snaps on the calculated tuck. In the new position, the upper channel A moves downwards and the joint mechanism located in the lower part of JQ is protected by the upper annular cavity r, the channel b is lowered down the upper cavity, the channel B is lowered into the lower annular cavity e, the valve works as a forward for reverse circulation.

housing and made in the form of a spring ring 5 installed in the groove of the housing. The upper and lower chambers of the housing 1 with the surface of the sleeve 2 form cavities g, e. In the lower part, the corbel 6 goes down the upper cavity, the channel descends into the lower annular cavity g, the valve works as a direct flow for reverse circulation.

The fluid passes successively to the bottom 1 on a thread that is installed upwardly from the bottom of the casing 6, in which the clamps of the upper and lower positions of the sleeve 2, made in the form of shear pins 7 and 8, are provided, and the seat is provided with a clamp 9 of the intermediate position. A gasket 10 is installed between the bushing and the saddle. To seal the contacting surfaces of the housing and the E-pipe, rubber seals are installed. 11 For performing technological operations, a cast-iron niap 12 is used.

through the channel b, the annular cavity g, the upper channel a and further into the upper part of the casing, the cast-iron ball is raised.

At the end of the reverse cementing, a pressure of 8 to 10 MPa is created inside the column, the lower ityths 8 are cut off, moving the sleeve with the saddle further down against the pins of the pins 9 into the spacer 6, while the spring ring 5 snaps on the new outer surface of the movable sleeve 2 into the recesses. In the final lower part of it, ring 1KI passages are performed. In the hollow movable sleeve, the chamber 13 is made opposite the middle row of radial channels b. The overlapping element is made in the form of a ball 3 and is installed with the possibility of alternately forwarding the hub of the upper and lower inlet to the chamber, and the density of the material of the ball is less than the density of the washing liquid, and its diameter is less than half the height of the chamber of the movable hollow sleeve 2.

The upper annular cavity is aligned with the upper space of the casing and the upper channel a, the lower annular cavity g - with the beater channels, the rubber seals with sulfur - with the protrusion 3 - the valve works as a reverse for direct circulation. At the same time, if necessary, the liquid can flow from top to bottom from the top of the column to the bottom in the following way: through the top 55 ring 1, cavity d, top channel a, channel b, ring cavity d, channel c. After cutting the bottom pins and a small amount of test pumping fluid from the device, the device works as follows.

Before descending into the well in the housing 1 with a spacer 6 screwed into it, in which the shear upper 7 and lower 8 pins are installed, as well as the spring ring 5,

insert sleeve 2 assembled with seat 4, intermediate position lock 9, ball 3, gasket 10, rubber seals 11 against the upper shear pins, while the split spring ring 5 snaps into recesses of the seat. In such an initial position, the upper annular cavity r is aligned with the lateral upper channel b and the lateral lower channel b, the valve operates as a reverse for direct circulation.

Before starting the reverse cementing, the cast-iron ball, which closes the central channel, is dropped into the casing string. Creating a pressure of 3-4 MPa on ycTiie, shears off the shafts 7 by moving the sleeve 2 with the seat 4 to the stop with the lower shear pins 8, while the split spring ring, having passed the saddle below, snaps onto the calculated pull. In the new position, the upper channel A moves downwards and co-moves b downwards to the upper cavity, the channel B descends to the lower annular cavity g, the valve operates as a direct flow for reverse circulation.

The fluid passes successively upwards from the bottom of the casing through the channel b, the annular cavity g, the upper channel a and further into the upper part of the casing, lifting the cast iron ball.

At the end of the reverse cementing, a pressure of 8 to 10 MPa is created inside the column, the lower ityths 8 are cut off, moving the sleeve and the seat further down to the stop of the pins 9 into the spacer 6, while the spring ring 5 snaps on the new recessed recesses. In the final half of the sleeve

The upper annular cavity is aligned with the upper space of the casing and the upper channel a, the lower annular cavity g - with the beater channels, the rubber seals with sulfur - with the protrusion 3 - the valve works as a reverse for direct circulation. In this case, if necessary, the liquid can flow from top to bottom from the top of the column to the bottom in the following way: through the top 5 ring 1, cavity d, upper channel a, channel b, ring cavity d, channel c. After cutting the bottom pins and a small amount of test fluid pumping, relieve the overpressure from the column and check the tightness of the check valve.

Claims (1)

Invention Formula A device for re-cementing casing strings, comprising a hollow body with upper and lower chambers made on its inner surface, a hollow movable sleeve with upper, middle and lower rows of radial channels and a fitting saddle for the casing element in it, blocking the channel element of the hollow movable bushings, locks of the lower and upper positions of the hollow movable bushings, characterized in that, in order to expand the technological capabilities of the device, it is provided with an intermediate lock position of the hollow movable bushing and ratchet mechanism placed in the lower part of the body and made in the form of a spring ring installed in the bore of the body and annular bore on the outer surface of the hollow movable bushing in its lower part, with the locks of the middle and upper position of the hollow movable bushing - made in the form of cut-off pins, in a hollow movable bushing there is a chamber against the middle row of radial channels with an overlapping element made in the shape of a shara and installed with the ability to alternately overlap the upper and lower inlet openings into the chamber, and the density of the material of the ball is less than the density of the washing liquid. o 2 Editor S. Patrushev Order 5497/29 Compiled by N. Chepiga Tehred I. Veres Corrector L. Patay Circulation 533 Subscription VNIIPI USSR State Committee for Invention and Discovery 113035, Moscow, Zh-35, Raushsk emb. 4/5. Production and printing and printing plant, Uzhgorod, ul. Projects, 4 Fig.Z