SU1456540A1 - Hole-bottom pressure pulser - Google Patents

Abstract

The invention relates to devices for the production of wells in the oil-producing industry. The goal is to expand the functionality by creating cycles of depression and repression without unpacking. The downhole pressure pulsator contains a sleeve B with annular grooves e made on its inner and outer surfaces and interconnected radial channels (RK) d. The sleeve 8 is installed in an annular gap between the housing 4 and the sleeve 6, in which additional RCs are made. In this case, the RC in the sleeves b, d of the sleeves 8 and g of the body 4 are connected with each other during axial displacements. With the right rotation of the pipe string,., I.e. the rod 1 relative to the housing 4, the bracket 7 slides along the screw groove and moves the sleeve 6 upwards. At the same time, the R 6 of the sleeves 6 are combined with the radial RK and the stem 1, and the additional RH in the sleeves 6 come out of the sleeve and are separated from the RK, d and e. A depression is created on the layer. With further rotation of the rod 1, the sleeve 6 moves down, the RC g, g and the annular grooves e are aligned, and the bottomhole pressure is aligned with the hydrostatic, i.e. repression is created on the seam. By adjusting the speed of rotation, the frequency of pressure fluctuations at the bottomhole hole is changed, 3 sludge. (L cd FidL

Description

The invention relates to devices for the initiation of wells in the oil and gas industry.

The purpose of the invention is the expansion of functional capabilities through the creation of cycles of depression and repression. without depressurization of packer.

Fig. 1 shows a structural diagram of the downhole pressure pulsator of Fig. 2, a sectional view. A-A in FIG. 1} in FIG. 3 illustrates the interaction of additional radial openings of the liner with the radial openings of the sleeve and body in the position of the pulsator to create repression on the formation.

The downhole pressure pulsator includes a hollow rod 1, an upper junction-- nick 2, in which the thrust bearing-3 is installed, a cylindrical body 4, a guide pin 5 fixed in it, a sleeve 6 with a clip 7, a sleeve 8 and a lower adapter 9, onto the outer surface of the stem 1 is cut to the right and the left-hand rectangular thread that forms the endless helical groove with which the clamp 7 of the sleeve 6 connects to form a mechanism for converting the rotary movement of the stem into reciprocating movement of the sleeve. Stem 1 and sleeve 6 have radial holes a and 5 that interact with each other (first valve). In addition, additional channels B are made in sleeve 6. The cylindrical case 4 has radial channels t. The sleeve 8 has annular grooves e on the inner and outer surfaces, which are interconnected by radial grooves. Radial channels B of the sleeve 6, j of sleeve 8 and r of the body 4 communicate with each other during axial displacements of the sleeve (second

3

valve). The sealing of movable and unresolved joints is carried out by dart rubber rings of circular cross section.

Pulsator works as follows.

The pulsator is in the position of disconnecting the radial channels 5 of the sleeve 6 (FIG. 3 and the stem 1 (first valve closed) and combining the radial channels 6 of the sleeve 6, g of the housing 4 and sleeve 8 (the second valve is open) is screwed onto the packer and lowered into the well) to a given depth, Performs a packer (packer installation).

d;

35

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25

thirty

40

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45

50

55

With this, the spline splines t out of the grooves in the adapter 2 and the protrusion of the rod 1 rests on the thrust bearing 3,

With the right rotation of the pipe string, stem 1 relative to the housing 4, the bracket 7 slides along the helical groove and moves the sleeve 6 upwards. In this case, the radial channels 6 sleeves 6 together. (Fig. 1) with radial channels on stem 1 (-first valve open), and additional channels in sleeves 6 exit from sleeve 8 and are separated from radial channels i of the body and sleeve (second valve closed). the device, reservoir 5, the sub packer space) is in communication with the in-line space, the pressure P under the valves is equalized with the pressure P in the cavity of the pipes above the valves and depressing is created on the formation. si

With further right rotation of the rod 1, the sleeve 6 moves down, the first valve closes and the second valve opens. In this case, the pressure P, (FIG. 3) is aligned through the radial holes in, g. And the annular grooves e with the hydrostatic pressure Pj of the liquid column in the well and the formation is repressed. With further right rotation of the rod 1, the sleeve 6 moves up, the first valve opens, the second valve closes and a depression is again created on the formation. With continuous rotation of the stem 1 onto the formation, alternately depressed and repressed are created. Thus, the reservoir is affected by a pulsating pressure with the greatest amplitude of co-. Lebani from the minimum possible to the maximum possible.

The regulation of the frequency of pressure oscillations at the bottomhole (near-well zone of the formation) is carried out by changing the speed of rotation of the columns; Tpy6i

When the tubing rotates to create a series of depressive-repressive cycles, the compressive load on the packer on the weight of the tubing string is constantly preserved and therefore the packer is not depressurized. Tie and re-install the packers, premature destruction of the rubber sealing of the packers and the associated unsuccessful operations;

By

314565

Compared with the known use of the proposed, the pulsator provides for the creation of a sufficient number of cycles of formation of depression and repressions on the formation, the required and controlled alternation of cycles and pressure oscillation frequency to influence the formation, elimination of unsuccessful operations and the resultant additional tool runs into the well, / reduced consumption of rubber packing cuffs.

Claims (1)

Invention Formula A downhole pressure pulsator comprising a cylindrical body with radial channels, upper and lower adapters, a thrust bearing mounted in the body, a hollow rod, and a gizgB 0 five 0 A memory device installed with a clearance relative to the housing, with periodically interconnected radial holes, and a mechanism for converting the rotary motion of the rod into reciprocating: a sleeve movement, characterized in that, in order to expand functionality by creating cycles of depression and repression without depressurization of the packer, it is equipped with a sleeve made from ring rings by grooves on the outer and inner surfaces and hydraulically connected to each other by radial channels and installed in the annular gap, the meseda has a body and a sleeve, while in the sleeve additional radial channels are made for hydraulic communication with the radial channels of the sleeve and the body. FIG. 2