CN211314136U - Reverse circulation anti-blocking device - Google Patents

Abstract

This paper discloses anti-blocking device prevents with the cover and mills the coupling and be connected, including the main part, be equipped with the fluid chamber in the main part, the fluid chamber with the water hole intercommunication of cover and mill the coupling, the lateral wall of main part is equipped with a plurality of intercommunications the fluid chamber prevents stifled hole with external, the aperture of preventing stifled hole equals or is less than the diameter of water hole for can block up the junk of water hole and block up outside anti-blocking device is prevented in the reverse circulation. The utility model relates to an oil well bores workover fishing tool technical field, provides a stifled device is prevented in reverse circulation, can overcome the junk and cause the problem of suppressing pressure, and it can prevent that smallclothes junk shutoff water hole from causing suppressing pressure to can take out the pit shaft with some smallclothes junk, improve circulation cover and mill the efficiency of construction.

Description

Reverse circulation anti-blocking device

Technical Field

The utility model relates to an oil well bores workover fishing tool technical field, especially relates to a reverse circulation prevents stifled device.

Background

In the long-term production process of the oil-water well, a production pipe column in the well is corroded and damaged by formation fluid, so that a plurality of small objects are lost in the well repairing process, such as a cable clamp, a packer rubber, a pressure gauge pipeline and the like.

The falling objects can cause great obstruction in the later-stage overhaul milling construction process. And because the power of circulating equipment is low, the annular sediment and small pieces of falling objects cannot be taken out of the shaft by the normal circulating casing milling operation of some well repairing platforms, the sediment and the falling objects are suspended and deposited in the shaft, and the risk of drilling sticking is increased. If reverse circulation milling is adopted, the water hole of the upper joint of the milling pipe is easily blocked by massive falling objects in the operation process, so that the pressure is suppressed, the milling operation cannot be carried out, and the milling operation can only be stopped.

SUMMERY OF THE UTILITY MODEL

The utility model provides a stifled device is prevented in reverse circulation can overcome the junk and cause the problem of suppressing pressure, and it can prevent that smallclothes junk shutoff water hole from, avoids causing suppressing pressure to can take out the pit shaft with some smallclothes junk, improve the circulation and cover mills the efficiency of construction.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the utility model provides a stifled device is prevented in reverse circulation, is connected with the casing milling pipe joint, includes the main part, be equipped with the fluid chamber in the main part, the fluid chamber with the water hole intercommunication of casing milling pipe joint, the lateral wall of main part is equipped with a plurality of intercommunications the fluid chamber is with external stifled hole of preventing, the aperture of preventing stifled hole is equal to or less than the diameter of water hole for can block up the junk of water hole and block up outside the stifled device is prevented in reverse circulation.

In one possible design, a filtering member is arranged in the main body, the filtering member divides the fluid cavity into a fluid passage and a recovery bin which are arranged up and down, the anti-blocking hole is formed in the side wall of the fluid passage, and the recovery bin is used for precipitating residual falling objects.

The utility model provides a possible design, retrieve the storehouse and include the trompil section and the closed section that set up from top to bottom, the lateral wall of trompil section is equipped with the through-hole, the diameter of through-hole is less than prevent the aperture in stifled hole.

In one possible embodiment, the filter element has a plurality of filter openings, the size of which is equal to the size of the anti-clogging openings.

In one possible design, the body is provided as a straight metal tube open at one end and closed at the other.

In one possible embodiment, the main body comprises an upper tube and a lower tube which can be coupled together in a detachable manner, the filter element being arranged between the upper tube and the lower tube, the fluid passage and the recovery bin being arranged in the upper tube and the lower tube, respectively.

In one possible design, the body includes an upper fitting at an upper end thereof, the upper fitting being connected to the casing milling head.

In a possible embodiment, the upper connection is provided with an internal thread which cooperates with the milling tube connection and an external thread which cooperates with a housing outside the milling tube connection for a threaded connection.

The utility model discloses beneficial effect of embodiment:

the utility model discloses stifled device is prevented in reverse circulation is guaranteeing under the prerequisite that workover fluid accessible went back on it when the reverse circulation washes the operation, can stop the junk that blocks up the eye of a river again and prevent stifled device in reverse circulation outside, avoid causing the suppress pressure and unable circulation.

The utility model discloses anti-stifled device is equipped with and filters and retrieves the storehouse to the reverse circulation, can retrieve the junk that filters the sediment, takes out the pit shaft to circulation shell milling efficiency of construction has been improved.

The utility model discloses anti-stifled device is prevented in reverse circulation is connected with shell milling pipe joint and shell respectively, and firm in connection is stable.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The invention will be further explained with reference to the drawings:

FIG. 1 is a schematic view of a reverse circulation anti-clogging device;

FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;

FIG. 4 is a schematic view of a reverse circulation block prevention device according to another embodiment;

FIG. 5 is a schematic view of a reverse circulation block prevention device according to yet another embodiment.

Reference numerals: 1-main body, 2-anti-blocking hole, 3-filtering piece, 4-upper joint, 5-recovery bin, 6-fluid cavity, 7-fluid channel, 8-open section, 9-closed section, 10-through hole, 11-internal thread, 12-external thread, 13-filtering hole, 14-upper pipe, 15-lower pipe and 16-plug.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description of the embodiments of the present invention is provided with reference to the accompanying drawings, and it should be noted that, in the case of conflict, the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other.

Please refer to fig. 1 to fig. 3, which illustrate an anti-blocking device for reverse circulation according to an embodiment of the present invention. As shown in fig. 1, the upper end of the reverse circulation anti-blocking device can be connected with the milling pipe joint, and the reverse circulation anti-blocking device comprises a main body 1 with an open upper end and a closed lower end, wherein a fluid cavity 6 is arranged in the main body 1, the fluid cavity 6 can be communicated with the water hole of the milling pipe joint, the side wall of the main body 1 is provided with a plurality of anti-blocking holes 2 communicated with the fluid cavity 6 and the outside, the aperture of each anti-blocking hole 2 is equal to the diameter of the water hole, and small falling objects capable of blocking the water hole are blocked outside the anti-blocking holes 2. Therefore, when the reverse circulation anti-blocking device is used for reverse circulation flushing operation, workover fluid can return upwards through the anti-blocking hole 2 and the fluid cavity 6, and small drops blocking the water hole can be blocked outside the reverse circulation anti-blocking device, so that the situation that the small drops block the water hole to cause pressure building and cannot circulate is avoided.

Specifically, as shown in fig. 1 to 3, the main body 1 is a straight metal pipe with an open upper end and a closed lower end, and a transverse filter member 3 is disposed in the straight metal pipe, the filter member 3 separates a fluid chamber 6 into a fluid passage 7 and a recovery chamber 5 which are disposed up and down, a plurality of the anti-blocking holes 2 are uniformly disposed on the chamber wall of the fluid passage 7, and the anti-blocking holes 2 are not disposed on the chamber wall of the recovery chamber 5. During reverse circulation, fluid in the wellbore can pass from the anti-plugging holes 2 into the fluid passageway 7 and then be drawn into the port. The filter member 3 is a filter net covering the cross section of the fluid chamber 6 and having a plurality of filter holes 13 formed therein to communicate the fluid passage 7 with the recovery bin 5, and the filter holes 13 of this embodiment have a diameter equal to that of the anti-clogging holes 2. The recycling bin 5 specifically comprises an open section 8 and a closed section 9 which are arranged up and down, wherein the side wall of the open section 8 is provided with a through hole 10, the closed section 9 is not provided with any hole so as to accommodate deposited falling objects, and the diameter of the through hole 10 is smaller than the aperture of the anti-blocking hole 2. In the reverse circulation process, liquid in the shaft can enter the fluid channel 7 through the through hole 10 and the filter hole 13, small fallen objects can be precipitated in the recovery bin 5 and fall to the bottom of the recovery bin 5, and the small fallen objects can be carried out of the shaft by the reverse circulation anti-blocking device after the operation is finished, so that the construction efficiency of circular casing milling is improved. Notably, the anti-blocking holes 2, the filtering holes 10 and other openings of different anti-circulation anti-blocking devices are different in size, so that when the anti-blocking device is used, operators can select the anti-circulation anti-blocking devices with different openings according to different well conditions, and the filtering precision is improved.

In addition, the reverse circulation anti-blocking device of this embodiment adopts threaded connection with the casing milling pipe joint, and it is stable firm after connecting. Wherein the body 1 comprises an upper joint 4 at its upper end, the inner wall of the upper joint 4 being provided with an internal thread 11 for cooperation with a milling pipe joint, the outer wall thereof being provided with an external thread 12, which external thread 12 is engageable with a housing located outside the milling pipe joint, whereby the upper joint 4 forms a double-threaded connection. Therefore, the reverse circulation anti-blocking device can be detached and replaced, the maintenance is simple, and the service life of the tool is prolonged.

Experiments and experiences show that the reverse circulation anti-blocking device of the embodiment saves 2 days per well according to reverse circulation sleeve milling construction, the reverse circulation sleeve milling construction is carried out 10 wells per year, the offshore oilfield workover cost is calculated by 10 ten thousand per day, and the workover cost can be saved by 200 ten thousand yuan per year, so that the construction cost can be greatly reduced.

In another embodiment, shown in figure 4, the body comprises an upper tube 14 and a lower tube 15 which can be removably connected, wherein the lower end of the upper tube 14 and the upper end of the lower tube 15 are screwed and sealed, the filter element 3 is clamped between the upper tube 14 and the lower tube 15, the upper tube 14 forms the above-mentioned fluid passage 7 and the lower tube 15 forms the recovery bin 5. Therefore, the upper pipe 14, the filtering piece 3 and the lower pipe 15 can be detached, and cleaning and replacement after operation are facilitated.

In a further embodiment, the bottom of the main body 1 is provided with an opening, i.e. the bottom of the recycling bin 5 is open, and the opening is provided with a removable plug 16, wherein the plug 16 blocks the opening, is in threaded connection with the main body 1 and ensures sealing. Therefore, after the operation is finished, the operation personnel can disassemble the plug 16 to clean the recovery bin 5, so that the operation personnel is more convenient and faster, and the construction efficiency is improved.

In combination with the above embodiment, the utility model discloses anti-circulation prevents stifled device is guaranteeing under the prerequisite that workover fluid accessible went back on it when the anti-circulation washes the operation, can stop the junk that blocks up the water hole again and prevent stifled device in the anti-circulation outside, avoid causing the suppress pressure and unable circulation. The utility model discloses anti-stifled device is equipped with and filters and retrieves the storehouse to the reverse circulation, can retrieve the junk that filters the sediment, takes out the pit shaft to circulation shell milling efficiency of construction has been improved. The utility model discloses anti-stifled device is prevented in reverse circulation is connected with shell milling pipe joint and shell respectively, and firm in connection is stable.

In the description of the present application, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been described above, the description is only for the convenience of understanding the present invention, and the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. The reverse circulation anti-blocking device is connected with a casing milling pipe joint and is characterized by comprising a main body, wherein a fluid cavity is arranged in the main body and is communicated with a water hole of the casing milling pipe joint, a plurality of anti-blocking holes communicated with the fluid cavity and the outside are formed in the side wall of the main body, and the aperture of each anti-blocking hole is equal to or smaller than the diameter of the corresponding water hole and used for blocking falling objects capable of blocking the water hole outside the reverse circulation anti-blocking device.

2. A reverse circulation anti-clogging device according to claim 1, wherein a filter member is provided in said main body, said filter member dividing said fluid chamber into a fluid passage and a recovery bin arranged up and down, said anti-clogging hole being provided in a side wall of said fluid passage, said recovery bin being provided for settling residual debris.

3. The reverse circulation anti-blocking device according to claim 2, wherein the recycling bin comprises an open section and a closed section which are arranged up and down, the side wall of the open section is provided with a through hole, and the diameter of the through hole is smaller than the aperture of the anti-blocking hole.

4. A reverse circulation anti-clogging device according to claim 2, wherein said filter member is provided with a plurality of filter holes having a diameter equal to that of said anti-clogging hole.

5. A reverse circulation anti-clog device according to claim 2, wherein said body is provided as a straight metal tube having one end open and the other end closed.

6. A reverse circulation anti-clogging device according to claim 2, wherein said main body comprises upper and lower detachably connectable tubes, said filter element being disposed between said upper and lower tubes, said fluid passage and recovery bin being disposed in said upper and lower tubes, respectively.

7. A reverse circulation anti-clog device according to any one of claims 1 to 6, wherein said body comprises an upper fitting at an upper end thereof, said upper fitting being connected to said casing milling pipe fitting.

8. The reverse circulation anti-clog device according to claim 7, wherein said upper nipple is provided with an internal thread for engagement with said casing joint and an external thread for engagement with a housing located outside said casing joint for threaded engagement.

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