CN215595551U - Reverse filling tool - Google Patents

Abstract

The utility model discloses a reverse filling tool, which is integrally of a tubular structure, wherein a lower joint is sequentially in threaded connection with a valve sleeve, an inner pipe, an upper joint and an oil pipe column from bottom to top, a spring seat is arranged in the lower joint, a return spring is arranged on the spring seat, the upper part of the return spring is sleeved on the lower part of a valve seat of a bottom valve, a valve ball is arranged on the valve seat, a baffle is arranged on the upper valve seat of the valve ball, the valve seat is arranged in a valve body II, the bottom valve is arranged in the valve sleeve, the upper part of the bottom valve is sequentially in threaded connection with a middle sleeve and a pressing sleeve through threads, the middle upper part of an inner hole of the upper joint is connected with a spring valve through threads, a flushing pipe is in threaded connection with an insertion pipe through an inner coupling, the insertion pipe is inserted into the middle sleeve through a center hole of the oil pipe column, the spring valve and the pressing sleeve, and a sealing element is arranged between the insertion pipe and the middle sleeve. The utility model has novel design, unique structure, convenient operation, stable liquid flow and good directional consistency, and can meet the sand prevention requirement of the horizontal well of the viscous oil, high argillaceous and fine sand unconsolidated sandstone reservoir.

Description

Reverse filling tool

Technical Field

The utility model relates to the technical field of oil extraction downhole tools in oil fields, in particular to a reverse filling tool.

Background

The exploitation of domestic oil fields gradually enters the middle and later stages, the exploitation difficulty is increased, and the sand production is more serious. The bottom-fill technology is slowly accepted and used because it has the advantages of no sand setting, no formation of sand bridges, etc. The high-pressure filling has the advantages of short well occupying time, long sand prevention effective period, high fluid production strength, good sand filtering effect and the like, and is more and more popular with users. However, the current partial bottom filling tool still has the phenomenon that the opening and closing of the filling channel by the service tool are failed, and can not adapt to the technical process of high-pressure filling. The existing reverse filling tool has single function, and can back-wash the well after the pipe column is lifted by the operation lifting equipment after filling is finished, so that the construction difficulty is increased, the production efficiency is reduced, and the complex conditions such as sand blockage and the like are not easy to timely treat. At present, China enters a high-quality development stage, an oil field also provides a high-quality development target, wherein a concept of effective primary sand prevention throughout the life is provided, and the well time of a sand prevention pipe column needs to be greatly prolonged. Because the unconsolidated sandstone reservoir is rich in argillaceous silty fine sand, the filling barrier can be slowly blocked in the production process, and when the filling barrier is blocked to a certain degree and the liquid production amount is influenced, the sand control pipe column can be replaced normally to prevent sand again, so that the sand control period is shortened. Therefore, at present, the oil field needs to research on prolonging the well time of the sand control pipe column, and high-quality development is realized through process progress, material updating, method lifting and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects and provide a reverse filling tool. The problem of failure of opening and closing a filling channel by a bottom filling tool is solved, the sand prevention requirements of a horizontal well of a heavy oil, high-mud and fine sand loose sandstone reservoir are met, and meanwhile, the sand prevention period is greatly prolonged by a method of refilling clean gravel after cleaning a polluted gravel layer without pulling a sand prevention pipe column in the later period.

The purpose of the utility model is realized by the following technical scheme:

the utility model comprises the following steps: the device comprises a flushing pipe, a tubing string, an inner coupling, an insertion pipe, an upper joint, a spring valve, a pressing sleeve, a sealing element, an inner pipe, a middle sleeve, a bottom valve, an inner filling port, an outer filling port, a pin, a valve sleeve, a lower joint, a return spring, a spring seat and a backwashing channel; the method is characterized in that: the utility model provides a reverse filling tool is the tubular structure, the lower clutch from bottom to top in proper order with the valve barrel, the inner tube, the top connection, tubing string threaded connection, be equipped with the spring holder in the lower clutch, be equipped with reset spring on the spring holder, reset spring's upper portion cover is in the lower part of the disk seat of bottom valve, be equipped with the valve ball on the disk seat, be equipped with the baffle on the upper portion disk seat of valve ball, the disk seat is established in valve body II, the bottom valve is established in the valve barrel, the upper portion of bottom valve pass through the screw thread in proper order with middle cover, press cover threaded connection, upper portion passes through threaded connection spring valve in the top connection hole, the washing pipe passes through inner collar and intubate threaded connection, the intubate passes through tubing string centre bore, the spring valve, press the cover, insert in the middle cover, be equipped with the sealing member between intubate and the middle cover.

Further, the lower part of the valve body I of the spring valve is provided with an oblique opening, the upper part of the valve body I is provided with an external thread matched with the upper joint, the lower part of the external thread is provided with an annular boss, the lower part of the boss is provided with a valve plate hinged through a hinge, and the valve plate blocks the oblique opening at the lower part of the valve body I through a torsion spring arranged on a hinge shaft of the hinge.

Furthermore, the pressing sleeve is a combination of a round pipe and a conical pipe, the round pipe part at the lower part is provided with an external thread connected with the middle sleeve, and the conical pipe part at the upper part is provided with a spline.

Furthermore, two upper sealing rings are arranged on the upper portion between the valve body II of the bottom valve and the valve seat, two lower sealing rings are arranged on the lower portion of the bottom valve, and a blind hole of a pin is formed in the valve seat between the two lower sealing rings.

Furthermore, the valve sleeve is cylindrical, an outer filling port is formed in the middle of the valve sleeve, an inner thread matched with the inner pipe is formed in the upper portion of the valve sleeve, and an inner thread matched with the lower connector is formed in the lower portion of the valve sleeve.

Furthermore, the middle part of the valve body II is provided with an inner filling opening, and 4 backwashing channels are uniformly distributed between the inner filling openings.

Furthermore, the baffle is circular, and 3-4 overflowing holes are formed outside the central hole.

Furthermore, after the valve sleeve and the valve body II are assembled, the outer filling port is communicated with the inner filling port oppositely, and the valve sleeve and the valve body II are fixed by penetrating through the blind hole in the valve seat through the pin.

Furthermore, the pin is made of copper or aluminum alloy materials.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second", "third", "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", "fourth" may explicitly or implicitly include at least one such feature.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," "fixed," "screwed" and the like are to be understood broadly, and for example, may be fixedly connected, or may be detachably connected or integrated; the components can be mechanically connected, directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other or the two components can interact with each other, and unless otherwise specifically limited, the specific meaning of the terms in the present invention can be understood by those skilled in the art according to specific situations.

Compared with the prior art, the reverse filling tool provided by the utility model has the following beneficial effects:

the utility model has novel design, when the sand control operation of an oil well is carried out, the spring valve of the reverse filling tool seals the inclined port at the lower part of the spring valve through the valve plate, thereby effectively preventing the liquid in the well from returning upwards, and the insert pipe is put into the sand control pipe column after the sand control pipe column is put into the designed well depth, thereby having convenient operation, more flexible use, stable liquid flow and good direction consistency. The unique structural design ensures that the fixed pipe column can be used for washing the well, reduces the influence of complex conditions such as sand blockage on the sand prevention quality, and is favorable for realizing dense filling. And has the function of later-period sand supplement. The sand prevention requirement of the horizontal well with the thickened oil, high argillaceous quality and loose sandstone reservoir with the fine sand can be met.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below, and the same reference numerals will be used throughout the drawings to designate the same components, which are for the purpose of illustrating the preferred embodiments only and are not to be construed as limiting the present invention.

FIG. 1 is a schematic view of a front view of a full-section structure of the present invention

FIG. 2 is a schematic structural view of the spring valve 5

FIG. 3 is a schematic view of the front view of the pressing sleeve 6

FIG. 4 is a schematic top view of the pressing sleeve 6

FIG. 5 is a schematic cross-sectional view A-A of the valve body 10;

in the figure, 0 is a flushing pipe, 1 is an oil pipe column, 2 is an inner collar, 3 is an insertion pipe, 4 is an upper connector, 5 is a spring valve, 501 is a valve body I, 502 is a valve plate, 503 is a hinge, 504 is a torsion spring, 6 is a pressing sleeve, 7 is a sealing element, 8 is an inner pipe, 9 is an intermediate sleeve, 10 is a bottom valve, 101 is a valve body II, 102 is a valve ball, 103 is a valve seat, 104 is a lower sealing ring, 105 is an upper sealing ring, 106 is an overflowing hole, and 107 is a baffle; 11. the device comprises an inner filling port, 12 outer filling ports, 13 pins, 14 valve sleeves, 15 lower connectors, 16 return springs, 17 spring seats and 18 backwashing channels.

Detailed Description

To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, with the specific understanding that: both a and B may be included, a may be present alone, or B may be present alone, and any of the three cases can be provided.

The utility model will be further described with reference to the following figures and embodiments:

as shown in fig. 1, a reverse fill tool, comprising: the device comprises a flushing pipe 0, an oil pipe column 1, an inner ferrule 2, an insertion pipe 3, an upper joint 4, a spring valve 5, a pressing sleeve 6, a sealing element 7, an inner pipe 8, a middle sleeve 9, a bottom valve 10, an inner filling port 11, an outer filling port 12, a pin 13, a valve sleeve 14, a lower joint 15, a return spring 16, a spring seat 17 and a backwashing channel 8. The reverse filling tool is of a tubular structure, a lower connector 15 is sequentially in threaded connection with a valve sleeve 14, an inner tube 8, an upper connector 4 and a tubing string 1 from bottom to top, a spring seat 17 is arranged in the lower connector 15, a return spring 16 is arranged on the spring seat 17, the upper portion of the return spring 16 is sleeved on the lower portion of a valve seat 103 of a bottom valve 10, a valve ball 102 is arranged on the valve seat 103, a baffle 107 is arranged on the upper portion valve seat 103 of the valve ball 102, the valve seat 103 is arranged in a valve body II 101, the bottom valve 10 is arranged in the valve sleeve 14, the upper portion of the bottom valve 10 is sequentially in threaded connection with a middle sleeve 9 and a pressing sleeve 6 through threads, the upper portion of an inner hole of the upper connector 4 is connected with a spring valve 5 through threads, a flushing pipe 0 is in threaded connection with an insertion pipe 3 through an inner coupling 2, the insertion pipe 3 is inserted into the middle sleeve 9 through a central hole of the tubing string 1, the spring valve 5, the pressing sleeve 6 is inserted into the middle sleeve 9, and a sealing element 7 is arranged between the insertion pipe 3 and the middle sleeve 9.

The cannula 3 can slide freely inside the seal 7 and seal well at a pressure of 30 MPa.

Specifically, the sealing element 7 is a graphite sealing packing.

Specifically, the lower part of the valve body I501 of the spring valve 5 is provided with an oblique opening, the upper part of the valve body I501 is provided with an external thread matched with the upper joint 4, the lower part of the external thread is provided with an annular boss, the lower part of the boss is provided with a valve plate 502 hinged through a hinge 503, and the valve plate 502 blocks the oblique opening at the lower part of the valve body I501 through a torsion spring 504 arranged on a hinge shaft of the hinge 503.

Specifically, the pressing sleeve 6 is a combination of a round pipe and a conical pipe, the round pipe at the lower part is provided with an external thread connected with the middle sleeve 9, and the conical pipe at the upper part is provided with a spline.

Specifically, two upper sealing rings 105 are arranged on the upper portion between the valve body II 101 and the valve seat 103 of the bottom valve 10, two lower sealing rings 104 are arranged on the lower portion, and a blind hole of the pin 13 is formed in the valve seat 103 between the two lower sealing rings 104.

Specifically, the valve sleeve 14 is cylindrical, the middle part of the valve sleeve is provided with an external filling port 12, the upper part of the valve sleeve is provided with an internal thread matched with the inner pipe 8, and the lower part of the valve sleeve is provided with an internal thread matched with the lower joint 15.

Specifically, the middle part of the valve body II 101 is provided with 4 inner filling ports 11, and 4 backwashing channels 18 are uniformly distributed between the inner filling ports 11.

Specifically, the baffle 107 is circular, and 4 overflowing holes 106 are formed outside the central hole.

Specifically, after the valve sleeve 14 and the valve body II 101 are assembled, the outer filling port 12 is communicated with the inner filling port 11 oppositely, and the pin 13 penetrates through a blind hole in the valve seat 103 to be fixed.

Specifically, the pin 13 is made of a copper material so as to be cut off in operation.

A reverse filling tool is connected below a sand control screen pipe column, a packer capable of losing hands is connected above the sand control screen pipe column, an insertion pipe 3 is connected at the tail end of a washing pipe 0 below a central pipe in the packer capable of losing hands, and the insertion pipe 3 passes through a central hole of an oil pipe column 1, a spring valve 5, a pressing sleeve 6, an inserting sealing element 7 and a middle sleeve 9. Under the action of the valve ball 102, the liquid of the bottom valve 10 can only flow from bottom to top in a one-way mode. And (3) shearing the pin 13 downwards from the oil pipe column 1 through a cement truck from the wellhead in a forward direction, moving the valve seat 103 downwards to the lower part of the inner filling port 11, opening a filling channel, and performing sand prevention filling operation on the oil well while setting an upper packer. After the sand-proof filling operation of the oil well is finished and the pressurizing is stopped, the valve body moves upwards to reset under the elastic force of the reset spring 16, and the inner filling opening 11 is sealed.

The reverse filling tool is more flexible to use, stable in liquid flow and good in directional consistency during sand prevention operation of an oil well, so that the sand prevention requirement of a horizontal well with thick oil, high argillaceous and fine sand loose sandstone oil reservoir is met.

While preferred embodiments of the present invention have been described above, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted to embrace the preferred embodiments and all such variations and modifications as fall within the scope of the utility model.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims (9)

1. A reverse fill tool, comprising: the device comprises a flushing pipe (0), an oil pipe column (1), an inner ferrule (2), an insertion pipe (3), an upper joint (4), a spring valve (5), a pressing sleeve (6), a sealing element (7), an inner pipe (8), a middle sleeve (9), a bottom valve (10), an inner filling port (11), an outer filling port (12), a pin (13), a valve sleeve (14), a lower joint (15), a return spring (16), a spring seat (17) and a backwashing channel (18); the method is characterized in that: the reverse filling tool is of a tubular structure, a lower joint (15) is in threaded connection with a valve sleeve (14), an inner pipe (8), an upper joint (4) and an oil string (1) from bottom to top in sequence, a spring seat (17) is arranged in the lower joint (15), a return spring (16) is arranged on the spring seat (17), the upper portion of the return spring (16) is sleeved on the lower portion of a valve seat (103) of a bottom valve (10), a valve ball (102) is arranged on the valve seat (103), a baffle plate (107) is arranged on the upper portion of the valve ball (102), the valve seat (103) is arranged in a valve body II (101), the bottom valve (10) is arranged in the valve sleeve (14), the upper portion of the bottom valve (10) is in threaded connection with a middle sleeve (9) and a pressing sleeve (6) in sequence through threads, the middle upper portion of an inner hole of the upper joint (4) is in threaded connection with a spring valve (5), a flushing pipe (0) is in threaded connection with an insertion pipe (3) through an inner coupling (2), the insertion tube (3) is inserted into the middle sleeve (9) through a central hole of the tubing string (1), the spring valve (5) and the pressing sleeve (6), and a sealing element (7) is arranged between the insertion tube (3) and the middle sleeve (9).

2. A reverse filling tool according to claim 1, wherein: the lower part of the I (501) of the valve body of the spring valve (5) is provided with an oblique opening, the upper part of the I (501) of the valve body is provided with an external thread matched with the upper joint (4), the lower part of the external thread is provided with an annular boss, the lower part of the boss is provided with a valve plate (502) hinged through a hinge (503), and the valve plate (502) blocks the oblique opening at the lower part of the I (501) of the valve body through a torsion spring (504) arranged on a hinge shaft of the hinge (503).

3. A reverse filling tool according to claim 1, wherein: the pressing sleeve (6) is a combination of a round pipe and a taper pipe, the round pipe part at the lower part is provided with an external thread connected with the middle sleeve (9), and the taper pipe part at the upper part is provided with a spline.

4. A reverse filling tool according to claim 1, wherein: two upper sealing rings (105) are arranged on the upper portion between the valve body II (101) and the valve seat (103) of the bottom valve (10), two lower sealing rings (104) are arranged on the lower portion, and a blind hole of the pin (13) is formed in the valve seat (103) between the two lower sealing rings (104).

5. A reverse filling tool according to claim 1, wherein: the valve sleeve (14) is cylindrical, an outer filling opening (12) is formed in the middle of the valve sleeve, internal threads matched with the inner pipe (8) are formed in the upper portion of the valve sleeve, and internal threads matched with the lower connector (15) are formed in the lower portion of the valve sleeve.

6. A reverse filling tool according to claim 1, wherein: the middle part of the valve body II (101) is provided with 4 inner filling ports (11), and 4 backwashing channels (18) are uniformly distributed between the inner filling ports (11).

7. A reverse filling tool according to claim 1, wherein: the baffle (107) is circular, and 3-4 overflowing holes (106) are formed outside the central hole.

8. A reverse filling tool according to claim 1, wherein: after the valve sleeve (14) and the valve body II (101) are assembled, the outer filling port (12) is communicated with the inner filling port (11) oppositely, and the valve sleeve is fixed by penetrating through a blind hole in the valve seat (103) through a pin (13).

9. A reverse filling tool according to claim 1, wherein: the pin (13) is made of copper or aluminum alloy materials.

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