SU1514905A1 - Packer - Google Patents

Abstract

The invention relates to the oil industry and can be used to divide the annulus while isolating the mud absorption zones during the drilling process. The goal is to increase the packer reliability in operation by eliminating blockage of its bore through hole during injection of plugging mixtures with a high content of large-sized and fibrous fillers into the well when the bore through hole is made equal to the internal channel of the drill pipe string. For this, the casing 7 of the core assembly is made with windows 16 under the dies 12, with internal grooves 11 under the ti 13 and an internal groove with an emphasis under the holder 14 and is located in the upper part of the hydraulic cylinder 15. The packer has a nipple tip 25, the surface of the side channel 26 is formed by two intersecting surfaces. The area of the channel 26 is made larger than the cross-sectional area of the passage channel of the barrel 1, and its inclined surface is made at an angle to the packer axis in the range of 25-30 °. To check the leak tightness, the squeezing fluid is injected into the drill pipe. Then the plugging mixture is pumped into the absorption zone. A large passage opening in the barrel 1 allows the use of high-performance, fast-setting mixtures with a high content of large-size and fibrous fillers. 1 hp f-ly, 7 ill.

Description

one

(21) 4174429 / 23-03

(22) 01/04/87

(46) 15-.10.89, Bull. Number 38

(71) State Almetyevsk Drilling Department

(72) P. G. Pugin, T.N. Bikchurin and R.S. Gabidullin

(53) 622.245.4 (088.8).

(56) Investigation and isolation of absorption zones using packers. M .: VNIIOENG, 1984, p. 29-31.

USSR author's certificate

No. 1321803, cl. E 21 V 33/12, 1985.

. (54) PACK

(57) The invention relates to the oil producing industry, and may be. is used. It is designed to separate the annulus while isolating the mud absorption zones during the drilling process. The goal is to increase the reliability of the packer in operation by eliminating blockage of the bore through its barrel during injection of plugging mixtures with a high content of large-sized and fibrous fillers into the well while executing the trunk bore with an equal size

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With an internal channel of a column of bore pipes. For this, the housing 7 of the core assembly is complete with windows 16 under the dies 12, with internal grooves 11 under the tubes x and 13 and an internal groove with an emphasis under the sleeve 14 and is located in the upper part of the hydraulic cylinder 15. The packer has a nipple tip 25, the surface of the side channel 26 formed by two intersecting surfaces. The channel 26 is larger than the bore through passage area

 The invention relates to oil production and can be used to disconnect the annulus when isolating zones of drilling mud concentration during the drilling of a well. : The purpose of the invention is to increase the reliability of the packer by eliminating blockage of the fgo trunk bore channel during injection into the borehole of plugging mixtures with a high content of large-sized and fibrous fillers making the bore bore equally sized with the inner pipe string of drill pipe.

FIG. 1 shows the packer in the trans-TNOM position; in fig. 2-5 are sections of individual packer units in its transport position; figure 6 packer in the working position; in fig. 7 section of the lower part of the packer at its caretand position;

The packer contains a hollow barrel 1 with a sub 2 and a radial channel 3, sealing elements 4 and 5 with an emphasis 6, a housing 7 of the core assembly with radial windows 8 and axial grooves 9, zsonus. I with grooves 11, dies 12, connected gami 13 with yoke 14, unit 1 of an idrivodrive, which includes a hydraulic cylinder 15 rigidly connected to the housing 7 of the root node 15 with sealing windows 16, a ring 17, the cavity 18 of which is hydraulically connected in its initial position to the cavity 19 of the barrel 1 through its radial channel 3 located in the cylinder 15, the piston 20 with the cuff 21 and the spring 29 rigidly connected to the yoke 14, the housing 23 installed on the hydraulic cylinder 15 and the lower end 24 of the barrel 1 under it for the sake of

Is-and its nak-pon surface is made at an angle to the axis of the packer in the range of 25-30. To check the leakage dissociation, squeezing fluid is injected into the drill pipes. Then the plugging mixture is pumped into the absorption zone. The large bore in the barrel 1 allows the use of high-performance quick-release mixes with a high content of large-sized and fibrous fillers. 1 z.p, f-ly, 7 ill.

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A channel 25 and a shunting tip 25 placed in the casing with a side channel 26 with a surface 27 inclined to the axis of the packer and a choke pipe 28. The hydraulic head 20 is rigidly connected to the casing with a housing 7 of the core assembly, made with the inner annular groove 29 with the stop 30 under the yoke 14. The inclined surface 27 of the side channel 26 of the choke tip 25 is formed by two intersecting surfaces at an angle of 25-30 ° to the axis of the packer, and the cross-sectional area of the side channel 26 is larger than the cross-sectional area of the bore 1 of the packer

Packer works as follows.

On a string of drill pipe, the packer is lowered into the well to a predetermined depth. Drilling fluid is injected into the pipe string. Before the choke hole 28, a pressure differential occurs, which is transmitted through the hole 3 into the cavity 18 of the hydraulic cylinder 15 and the piston 20 with the cuff 21 and the sleeve 14, compressing the spring 22, rises and pushes the dies 12 all the way to the borehole wall 31 .. When the tool is set, the weight of the packer and a part of the weight of the tool is transferred to the sealing elements 4.5. Then the injection of the solution is stopped and the load is adjusted to the maximum calculated value. The compression of the sealing elements 4 and 5 is accompanied by moving the barrel 1 of the packer to the lower position, in which the cavity 18 of the hydraulic cylinder 15 is sealed by the sealing ring 17, and the tip 25 with the side channel 26 emerges from under the housing 23 and communicates the cavity 19 of the packer and drill pipes with sub-packer zone 32. To check the leak-proofness of the separation of the obtrusion space, a squeezing fluid is injected into the drill pipes: if no overflow from the well is observed or the fluid level in the annulus does not increase, then the packer perekryp reliably absorption zone from the rest of the wellbore. Convinced of the tightness of the packer installation, a plugging mixture is pumped into the absorption zone, and the large bore hole in the packer barrel allows the use of highly efficient quick-setting blend, which is different.

si with a high content of large-size and fibrous fillers. After the mixture is pumped into the well, the mixture is forced into the absorption zone with the calculated amount of squeezing fluid and held until set.

Removing the packer is carried out by lifting the drill pipe, while the axial load from the sealing elements

4, b is removed and they accept the first 25 pipes, the core assembly is made

.the initial form, and the spring 22 returns the yoke 14 with the dies 12 and the piston 20 to its original position.

Claims (2)

1. A packer containing a hollow barrel with a sub and a radial channel, a sealing element mounted on the barrel with stops, a core assembly located under it, including a cone with grooves and dies mounted in them, connected with the holder, hydraulic drive unit including a hydraulic cylinder connected rigidly with the housing of the root node with a cavity hydraulically connected in the initial position with the trunk cavity through its radial channel, and a spring-loaded piston located therein rigidly connected to the holder of the root mechanism mounted below the packer on the hydraulic cylinder at the bottom end of the cylinder. its radial channel and the nipple tip disposed in the casing with a side channel with a surface inclined to the axis of the packer and choke pipe In order to increase the reliability of the packer in operation by eliminating blockage of the bore through its bore when injecting plugging mixtures with a high content of large-size and fibrous fillers into the borehole when making the 1st bore of the trunk equidistant with the inner bore of the drill string, ABOUT with windows for dies, internal grooves for ti and internal groove with an emphasis under the holder and placed in the upper part of the hydraulic cylinder, while the inclined surface of the side channel of the choke tip is formed by two intersecting surfaces mi-. 2. The packer according to claim 1, characterized in that the cross-sectional area of the lateral channel of the choke tip is made larger than the cross-sectional area of the bore through passage, and its inclined surface is made at an angle to the axis of the packer in the range of 25-30 °. -A fioBepf yma L W figl Editor O. Obsessive Compiled by L, Farukshin Tehred D. KravchukCorrector S. Cherni y-y 5 years P /five ji