SU1615335A1 - Method and apparatus for repeated cementing of casings - Google Patents

Abstract

This invention relates to the cementing of casing boreholes. The goal is to reduce the labor intensity of work and improve the quality of cementing. The casing is lowered into the well and the plugging material is fed under pressure into the annular space. During the descent of the column, an additional portion of the material is simultaneously delivered, which is fed into the annular space in the RFQ process of the main portion. The device includes a housing 1, on which a hollow annular container (K) 2 is fixed, and pistons 3 and 4 are installed in it. Pistons 3 and 4 divide K 2 into cavities 5-7. The upper cavity 5 is filled with a plugging material. In the middle cavity 6, between the pistons 3 and 4, an elastic element 8 is placed. The cavities 5 and 7 are connected with annular space 11 through holes 9 and 10. The device on the pipes is lowered into the well. Under the action of the hydrostatic pressure of the drilling and then cement slurry element 8 is compressed, creating a reserve of potential energy in K 2. After the end of cementing the column in the RFQ process, the pressure in the space 11 drops. Element 8 expands and squeezes the material out of cavity 5 into space 11. 2 sec. Ff, 1 slug.

Description

divides K 2 into cavities 5-7. Upper cavity: & filled with plugging material. An elastic element 8 is placed in the middle cavity b between the pistons 3 and 4. The floors: ty 5 and 7 are communicated through the holes 9 and 10 with the annular space 11. The device on the pipes is lowered into the well. Hydrostatic pressure

element 8 is compressed, creating a reserve of potential energy in K 2. After the end of cementing the column in the RFQ process, the pressure in the space 11 drops. Element 8 unclenches and squeezes the material from the cavity 5 into the space 11 2 pf files, 1 sludge.

The invention relates to the field of well construction, namely to methods and devices for re-cementing.

 bsadnyh columns.

The purpose of the invention is to reduce labor costs and improve the quality of re-cementing.

The drawing shows the device with the view.

The method consists in running the casing elonna and injecting under pressure into the collar 10.

   tss akolonnge tamping material space. In the process of running the casing

J- rvvj d ijn ПЫ

at the same time, an additional portion of the implanting material is delivered, which is fed into the annular space

about nnnji 4t- -i / -H OJJ. "...„

th solution decreases to reservoir (and sometimes lower). Therefore, due to the energy of the elastic element 8, the pressure in the cavity 5

turns out to be larger than in the annular space 11. If there are 11 voids or cracks in the annular space in the device area, the tampon material is automatically squeezed out of the container 2 through the opening 9 into the annular space 11 to fill the voids or cracks. Thus, the casing is re-cemented.

15

process ozts main portion.

The device includes a housing 1, on which a hollow annular container 2 is fixed, in the latter two pistons 3 and 20 4 are installed which divide the latter into three cavities 5- | 7. The upper cavity 5 is filled with an additional portion of the plugging mat f.fl D P CJ Y f-. -; 1-m - .. one .

ala and in the cavity 6 between the pistons

PS

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The elastic element B is mounted, for example, the p-spring. The upper 5 and lower 7 cavities are communicated through the openings 9 and 10 with the outer space -) 11,

; The method with the use of the device LN is implemented as follows.

The device in the casing assembly is lowered into the well. Under the influence; hydrostatic pressure of the drilling fluid, and after-hem of cement slurry (when permeating the casing string, elastic 8 is compressed, creating potential energy in the container 2

 After the termination of the primary cement OE of the casing hydrostatic-C Koje pressure in the annular space 11 due to hardening of the cementing formula of the invention. 1. A method of re-cementing the casing, which consists in lowering the casing, injecting pressure into the regular space of the tamping material, compacting it and waiting for the cementing material to harden (RPM), and so on. that in order to reduce labor-intensive work and improve the quality of cementing, compaction is carried out by delivering an additional portion of the plugging material during the casing process and feeding it into the annular space during the RFQ process and plugging material.

2. A device for re-cementing the casing, comprising a hollow annular container, communicating in the upper and lower parts with a casing, characterized in that in order to reduce the labor intensity and improve the quality of cementing, it is equipped with two pistons an element between them, an annular container s 40 installed with the possibility of three cavities in it, the top of which is filled with plugging material.

25

thirty

35

0

th solution decreases to reservoir (and sometimes lower). Therefore, due to the energy of the elastic element 8, the pressure in the cavity 5

turns out to be larger than in the annular space 11. If there are 11 voids or cracks in the annular space in the device area, the tampon material is automatically squeezed out of the container 2 through the opening 9 into the annular space 11 to fill the voids or cracks. Thus, the casing is re-cemented.

Claims (2)

Claim 1. The method of re-cementing the casing strings, which consists in lowering the casing string, applying the plugging material under pressure into the annular space, compacting the latter and waiting for the cementing material to harden (BSC), characterized in that, in order to reduce the complexity of the work and improve the quality of cementing, sealing carried out by delivering during the descent of the casing string an additional portion of the plugging material and feeding it into the annular space in the process of the bcc of the main portion of the swab izing material. 2. A device for re-cementing casing strings, including a hollow annular container communicating in the upper and lower parts with an annular space, characterized in that, in order to reduce the complexity of work and improve the quality of cementing, it is equipped with two pistons with an elastic element between them, installed s an annular container with the possibility of forming three cavities in it, the upper of which is filled with plugging material.