RU2733341C2 - Device for treatment of cavity of annular space of a casing string - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and can be used for cleaning wells. Device includes upper and lower housing. Upper housing is made with adapter adapter for connection by its upper part by means of external threaded connection with tubing string suspension, and internal threaded connection – with filter for cleaning of flow of working agent flowing along production string, and lower part upper housing is connected with upper internal threaded connection of lower housing device to form inner annular vortex working chamber. In the working chamber there is a hollow cylindrical central body with a conical fairing and holes in its side wall for provision of working medium flow from the vortex chamber to the lower end confuser hydrodynamic generator having an inlet cone hole, which is connected by threaded connection with cylindrical central body in its lower end part. Inlet taper hole of generator smoothly changes into critical hole, changing into exhaust channel for outlet of working fluid into processed cavity of annular space of casing string. Annular units with generators of hydrodynamic pulses in form of diffusers are installed in outer closed wall of lower housing with tiers at acute angle to vertical axis of device with confuser sections with inlet channels to allow flow of working agent from vortex chamber, changing into exhaust channels for outlet of working agent into processed cavity of annular space of casing string.

EFFECT: increased efficiency of device operation by generation of powerful high-frequency hydraulic impacts and increased amplitudes of shock wave and reduced time of treatment of annular space of the casing string.

4 cl, 6 dwg

Description

The invention relates to the oil and gas industry, namely to devices in the oil and gas industry in the development of hard-to-recover and unprofitable hydrocarbon reserves, and can be used for decolmating filters and near-filter zones of hydrogeological wells, for cleaning and flushing the casing with hydrodynamic pulses of the working fluid.

A device for cleaning is known, comprising a hollow body with an inlet channel, a tip with an axial channel rigidly attached to the hollow body, and a hydrodynamic pulse generator located coaxially with it, hydraulically connected through an axial channel with an input channel, characterized in that it is equipped with additional hydrodynamic pulse generators, placed in the tip around the circumference relative to the axial channel and hydraulically connected to the inlet channel, with each generator of hydrodynamic impulses made in the form of sequentially placed confuser, critical opening and diffuser (RU 2047740/1 /).

This device is ineffective, since it creates weak hydraulic shocks of low frequency, weakly erodes plug-forming sediments, does not have the effect of cutting off deposits and sagging from the surface of pipes and well walls. The device weakly provides dispersion of particles that form sediment and plugs, does not contribute to the formation of stable highly dispersed suspensions, which can be easily and without consequences removed from the casing.

The technical problem of the invention is the creation of a device design that provides the creation of a shearing and erosion effect on the walls of the casing by directing a jet of working fluid and hydraulic shocks at an angle to the wall along the entire perimeter of the casing and on the sump.

The technical problem is solved by the fact that the device for processing the cavity of the annular space of the casing string has an upper and a lower body. The upper body is made with an adapter-adapter for connecting its upper part by means of an external threaded connection with a tubing hanger (tubing). And the internal threaded connection - with a filter for cleaning the flow of the working agent flowing through the tubing. The lower part of the upper body is articulated with the upper internal threaded connection of the lower body of the device to form an internal annular vortex working chamber, in which a hollow cylindrical central body with a conical fairing and holes in its side wall is installed to ensure the flow of the working agent from the vortex chamber to the lower end confuser a hydrodynamic generator with an inlet conical opening, which is threadedly connected to a cylindrical central body in its lower end part. The inlet conical opening of the generator smoothly passes into the critical opening, which turns into the discharge channel for the outlet of the working fluid into the cavity of the casing annulus to be treated, in the outer closed wall of the lower housing, in tiers at an acute angle to the vertical axis of the device, there are annular blocks with generators of hydrodynamic impulses in the form of converging diffusers with inlet channels to ensure the flow of the working agent from the vortex chamber, passing into the exhaust channels for the working agent to exit into the cavity of the casing annulus to be treated.

The technical result achieved by the above set of essential features is to increase the efficiency of the device by generating powerful high-frequency hydraulic shocks and increased shock wave amplitudes and reducing the processing time of the annular space of the casing.

In this case, the blocks with generators on each tier can be installed evenly around the perimeter of the body by threaded connection with cavities in the walls of the lower body.

In this case, the angle of installation of blocks with generators on each tier can be different from the installation angles on each of the other tiers.

In this case, the exhaust ducts of at least one of the diffusers can be made with stepped outlets

The invention is illustrated by drawings.

FIG. 1 shows the claimed device assembled;

FIG. 2 shows a detail of the claimed device;

FIG. 3 shows the claimed device 1 attached to the leading tubing and installed in the perforation interval;

FIG. 4 shows a diagram of equipment piping at the well and the action of generators during operation of the device;

FIG. 5 shows the device in the process of its operation with a diagram of the functions performed.

FIG. 6 shows the location of the hydrodynamic generators 12, 13, 14 and a description of the filter design.

Positions in the drawings:

1 - the claimed device;

2 - the upper body of the device 1;

3 - the lower body of the device 1;

4 - a hollow cylindrical central body;

5 - filter nut 6;

6 - filter;

7 - filter plug 6;

8 - the upper end of the lower housing 3 with a thread;

9 - lower tier of the lower building 3;

10 - middle tier of the lower building 3;

11 - upper tier of the lower building 3;

12 - annular confuser diffuser installed in the lower tier 9;

13 - annular confuser diffuser installed in the middle tier 10 and in the upper tier 11;

14 - confuser hydrodynamic generator installed at the lower end of the central body 4 by means of a threaded connection in the generator head;

15 - the location of the annular converging diffuser 13, on the upper tier 11 of the lower housing 3.

16 - inlet channel of the diffuser 12 in the form of a conical hole;

17 - annular chamber of the diffuser 12, forming a critical hole;

18 - outlet channel of the diffuser 12;

19 - the inlet channel of the diffuser 13 in the form of a tapered hole;

20 - an annular chamber of the diffuser 13, forming a critical hole;

21 - exhaust stepped channel of the diffuser 13;

22 - inlet channel of the diffuser 14 in the form of a conical hole;

23 - annular chamber of the diffuser 14, forming a critical hole;

24 - discharge stepped channel of the diffuser 14;

25 - generator input channel 13 (enlarged), in the form of a tapered hole;

26 - annular chamber of the generator 13 (enlarged), forming a critical hole;

27 - generator outlet 13 (enlarged);

28 - mounting head;

29 - sealing washer of the fastening head 28 of the body 4;

30 - direction of movement of device 1 inside the tubing;

31 - direction of movement of the working fluid;

32 - tubing;

33 - threaded connection of tubing 32 and upper body 2;

34 - casing string;

35 - threaded connection of the filter 6 and the upper body 2;

36 - inner annular vortex working chamber;

37 - threaded connection of the upper body 2 and the lower body 3;

38 - interval of perforation in the walls of the casing 34;

39 - wellhead;

40 - tiers 9, 10 and 11 with diffusers 12, 13 and 14;

41 - conical fairing;

42 - garbage bin chamber;

43 - annular space;

44 - inlet channels on the side wall of the fairing 41;

45 - flushing gland;

46 - gate valves;

47 - discharge line;

48 - sampler;

49 - manometer;

50 - container with working fluid;

51 - supply line;

52 - pumping unit;

53 - discharge line;

54 - elevator;

55 - swivel;

56 - processing area;

57 - sump;

58 - cement stone;

59 - oil-bearing porous layer;

60 - destroyed sump;

61 — dispersed suspension.

The claimed device 1 for processing the cavity of the annular space 43 of the casing 34 has an upper body 2 and a lower body 3. The device 1 is installed at the wellhead 39 of the well and is connected to the tubing hanger 32 by means of an external threaded connection 33 with the upper body 2. Filter 6 for cleaning the flowing through The tubing 32 of the working fluid flow, by means of the nut 5, is connected by an internal threaded connection 35 to the upper body 2. The upper body 2 is made with a chamber 42 of the waste receptacle. The filter 6 has a plug 7. The lower part of the upper body 2 is articulated by means of a threaded connection 37 with the lower body 3 of the device 1 to form an internal annular vortex working chamber 36, in which a hollow cylindrical central body 4 with a conical fairing 41 and with inlet holes 44 on it is installed the side wall to ensure the flow of the working fluid from the vortex chamber 36 to the lower end confuser hydrodynamic generator 14. The side wall of the body 4 can be made in the form of a fine-mesh filter, fixed by the fastening head 28 with a sealing washer 29. The generator 14 is connected to the end of the body 4 by means of a threaded connection ... The generator 14 has an inlet conical channel 22 in the form of a conical hole, which smoothly turns into a critical hole 23, to prepare for a break in the continuity of the fluid flow, passing into an exhaust channel 24 for the outlet of the working fluid into the cavity to be processed in the annular space 43 of the casing 34, including the sump 57 In the outer closed wall of the lower housing 3, tiers 9, 10 and 11 are installed blocks of hydrodynamic impulse generators in the form of circular annular confuser diffusers 12, 13, 14. The diffuser 12 has an inlet channel 16 in the form of a conical hole, smoothly turning into a critical hole 17a formed the annular chamber 17, which passes into the exhaust channel 18. The diffuser 13 has an inlet 19 in the form of a conical opening, smoothly turning into a critical hole 20a formed by an annular chamber 20, which passes into a stepped exhaust channel 21. The diffuser 14 has an inlet 22 in the form conical hole, smoothly turning into critical from a hole 23a formed by an annular chamber 23, which passes into a stepped discharge channel 24. Through holes formed by said inlet channels 16, 19, 22 and discharge channels 18, 21, 24 provide the flow of the working fluid from the vortex chamber 36 through diffusers 12, 13, 14 for the outlet of the working fluid into the processed cavity of the annular space 43 of the casing string 34.

The device works as follows.

Before treating a well, we study its history and technical characteristics: year of operation, reservoir pressure, gas-oil ratio, level, waterlessness, flow rate, number of PIs, perforations and other parameters that are necessary to form a work schedule for the well.

1. Before make-up, tubing 32 must be inspected, patterned, tested for thread and pressure.

2. Screw the assembled device 1 into the assembly with a special filter 6 until it stops on the first leading pipe of tubing 32. Pass the assembled structure of device 1 through the wellhead 39 and allow it to be installed on the elevator of the tubing leading pipe coupling.

3. Build the benchmark (branch pipe) at least 1.5-2.5 meters long.

4. Device 1 is lowered by means of an elevator 54, a swivel 55 on a tubing hanger 32 and is installed at the level of the lower hole of the lower perforation interval 38. The planned tolerance of device 1 is predicted by calling a well logging batch in order to bind with a magnetic collar locator (MLM), by displaying it on the logging chart tape of the bench mark and kelly couplings. The production of geophysical tie is carried out in the presence of a representative of the company - the executor

5. By comparative analysis and comparison of the manual measure and the electronic meter of the GIS equipment, the location of the device 1 in the well is established. It is documented, signed by the interpreter, with an entry in the journal, the length of the total lowered assembly: device 1, sub, tubing, bench mark minus the length of the head of special. filter and taking into account the temperature stretch of the suspension.

6. Installation (assembly) of the technological lift (suspension) is carried out with the measurement of all suspension pipes with a metal tape measure.

7. Documentary confirm the measurements of the manual measure taken on the working platform with the display in the work log in columns of 10 measured pipes.

8. Produce suspension tolerance in the perforation interval 38 of the reservoir.

9. Before screwing the last driven tubing pipe 32, a sealing flush head is mounted on the wellhead 39 of the well.

10. Screw on the driven tubing 32 and pass it through the sealing head or through the gland of the flat-bottom blowout preventer, install the coupling of the driven tubing 32 on the elevator 54.

11. Screw the swivel 55 onto the coupling of the driven pipe or a branch pipe with a Haliburtan end connected through a high-pressure tap (gate valve) with the installation of a pressure gauge 49 with a division value of not more than 1 MPa.

12. Assemble by connecting the discharge line 47 (mud hose) from the wellhead 39 of the well to the inlet upper hatch of the buffer tank 50, the tensile strength is not lower than the pressure test.

13. Install a pressure gauge 49 with a valuable division of at least 1 MPa on the valve of the annular (outside the pipe) space 43.

14. Tamp the line of the pump unit 52 to the buffer tank 50.

15. Knock the inlet pipe (ratchet, intake sleeve) of the pump unit 52 to the lower gate valve of the container 50 with the working agent, or place it in an intermediate container with a volume of at least 5 m ³ , of a closed type with a drain pipe (tube).

16. Mount the discharge line 53 of the pipe space and connect it to the outlet valve of the pump unit 52, and knock the other end, connect it to the swivel 55. The tank 50 with the working agent, the discharge lines 53 and discharge lines 47 should not contain sand, other suspensions, foreign items. We make the system (process) closed.

17. Check (control) the tightness of the discharge line 53 by closing the high-pressure valve (valve 46) installed on the pipe space.

18. Pressurize the system in order to check the tightness of the deflated technological lift - (suspension) 32 by closing the valve of the wellhead valve of the annular (outside the pipe) space and opening the high pressure valve (valve) of the pipe space, but it is imperative to take into account the permissible pressure, which should not be higher than the casing pressure test.

19. After the circulation is restored, we pressurize the pumping unit 52 of the discharge line 53 and the discharge line 57. We eliminate leakage.

20. Unit 52 is located at a maximum distance from the intermediate tank 50 and the drilling rig, against the wind (resulting), the direction of the wind is determined before installing the equipment on the day of the OPZ.

21. Determine the injectivity of the well before its treatment, by setting the pressure not exceeding the pressure test when the space behind the pipe is closed.

22. With a smooth set of operating pressure of the pump unit 52, with an open annulus, we inject a working agent (fluid) of at least 20 MPa and begin to process the bottomhole zone of the well by slowly walking the device in the zone of the working perforation interval 38, thus we produce, carry out the BHT of the well with the device 1. Device 1 carries out cavitation-wave effects on the perforated strata of the formation by means of reciprocating movement of the pipe string along the perforation interval 38, where device 1 acts with the energy of its generators on the productive formation, clearing it from the products of removal, decolumates. At the same time, the powerful mechanism of hydraulic impulse generators - diffusers 13, 14, 15, located at certain angles to the axis of the well, activates the flow of the working agent, giving it a rotational motion, which cuts off the body of the sump 57, its crushing and removal by the working fluid flow at the wellhead 39 of the well ...

23. Due to the energy of the spent caverns, swabbing occurs, i.e. a decrease in the pressure of the static liquid column at the bottomhole, which leads to an additional inflow of oil or liquid.

24. In the process of processing, stop (stop) the unit 52 and monitor the level in the intermediate tank 50. In critical cases, download, drain excess liquid into an additional trough or tank, but with an open space behind the pipe. Thus, we provide additional processing of the oil-bearing formation.

25. When carrying out BHT, we determine the injectivity of the well using the working agent.

26. We draw up an act-protocol.

27. Removing the device 1.

29. The well is to be mastered no later than three days.

30. To remove the true indicators of oil production with reflection in the documents.

31. Unscrew the device 1 and place it in a container with a cleaning solution.

Device 1 carries out a powerful cavitation-wave effect on the entire perforated stratum of the formation, acts with its energy on the productive formation, cleansing it from the products of removal, decolmates, cleans the intervals of perforation, cuts off the sump, disperses it with the subsequent release of decay products at the wellhead, thereby producing intensification of the bottomhole zone of the well, which makes it possible to obtain an increase in fluid inflow (increase in production rate), additionally extracting oil, water, fluids, gas condensate from the earth's crust. This invention provides an opportunity for an integrated solution to increase the production rate of wells using a multifactorial mechanism for influencing the near-wellbore zone. The device is compatible with other technological designs.

Device 1 simultaneously generates a powerful cavitation beam, creating a cavitation cloud, providing simultaneous treatment of the bottomhole zone of the well circumferentially by 360 ° and 180 ° in the direction of the end part towards the head of the sump 57. The cavitation energy generated by the device provides 100% processing of the perforation interval 38. This design feature of the device 1 is provided by blocks of converging diffusers 12, 13 and 14, located in tiers 9, 10, 11 to obtain such a powerful and versatile energy and mechanical effects.

The number of converging diffusers 12, 13 and 14, their power of impact on the BHZ, can be calculated individually for each treated well and are determined by the operators and geologists of the fields when solving the tasks they perform.

The device 1 simultaneously acts on the sump 57 with an end generator 14 with a display in dynamics on (Fig. 5), coupled with the central body 4, destroying the sump 57. Simultaneously with it, another block of diffusers 12 located on the lower tier 9 works to destroy the sump 57 They are processed at an angle of forty-five degrees. Further, converging diffusers 13, located on the upper and middle tiers 10, 11, which are displaced along the tiers relative to the centerline of the device 1 by 30 degrees, operate at different angles to the casing and the holes of the perforation interval 38, clearing all the channels of the perforation interval 38 from deposits, and also cleaned through the channels the nearest layer of the formation. This occurs under the action of the sound-capillary effect and intense microflows, the liquid penetrates into pores and cracks, where, when the cavitation bubbles collapse, a powerful shock wave arises, contributing to the destruction of materials, sediments and layers that clog the well. Simultaneous treatment of the bottomhole zone of the well and cutting off the sump 57 is carried out due to the constructive twisting of the working agent flow by device 1, which rotates the flow of annular fluid, then destroys the sump 57 and flushes it with the flow of the working agent at the wellhead 39.

Thus, the claimed device unites generators of various types into a powerful energy device, a universal supercavitation generator, using a simultaneous combination of several technological processes at once - dispersion, shearing off deposits and sagging, destruction of crystallization centers, excitation of low and high frequency shock waves, cleaning the power supply, cutting off the sump , swabbing, flushing and removal of destroyed particles, suspension, at the wellhead.

Claims (4)

1. A device for treating the cavity of the annular space of the casing, having an upper and a lower body, while the upper body is made with an adapter-adapter for connecting its upper part by means of an external threaded connection with the tubing hanger, and an internal threaded connection with a filter for cleaning the flowing through The tubing of the working agent flow, and the lower part of the upper body is articulated with the upper internal threaded connection of the lower body of the device to form an inner annular vortex working chamber, in which a hollow cylindrical central body with a conical fairing and holes in its side wall is installed to ensure the flow of the working agent from the vortex chamber to the lower end confuser hydrodynamic generator, which has an inlet conical opening, which is threadedly connected to a cylindrical central body in its lower end part, while the inlet conical opening of the generator smoothly turns into a critical f the hole that passes into the discharge channel for the working fluid outlet into the treated cavity of the casing annulus, in the outer closed wall of the lower body, in tiers at an acute angle to the vertical axis of the device, there are annular blocks with hydrodynamic impulse generators in the form of diffusers with converging sections with inlet channels for ensuring the flow of the working agent from the vortex chamber, passing into the discharge channels for the working agent to exit into the treated cavity of the annular space of the casing. 2. The device according to claim. 1, characterized in that the blocks with generators on each tier are installed evenly along the perimeter of the body by threaded connection with cavities in the walls of the lower body. 3. The device according to claim 1, characterized in that the angle of installation of blocks with generators on each tier is different from the angles of installation on each of the other tiers. 4. A device according to claim 1, characterized in that the exhaust ducts of at least one of the diffusers are made with stepped outlets.

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