CN219492236U - Integrated sand setting well-flushing protection device - Google Patents

Abstract

The utility model relates to an integrated sand setting well flushing protection device, which relates to the technical field of oil and gas well drilling development and comprises a central pipe, wherein an upper joint is connected with the upper end of the central pipe in a threaded manner, an inner separation pipe is connected with the lower end of the central pipe in a threaded manner through an outer sleeve, two ends of the outer sleeve are respectively connected with the central pipe and the inner separation pipe in a threaded manner, an outer sleeve liquid inlet hole is formed in the outer sleeve, an inner separation pipe liquid inlet hole is formed in the inner separation pipe, a vortex accelerating spiral is arranged in an interlayer of the outer sleeve and the inner separation pipe, and the vortex accelerating spiral is fixedly arranged on the outer wall of the inner separation pipe.

Description

Integrated sand setting well-flushing protection device

Technical Field

The utility model relates to the technical field of oil and gas well drilling development, in particular to an integrated sand setting well-flushing protection device.

Background

According to the domestic oil field oil layer distribution form and exploitation development type, some well oil wells are developed and produced in the later stage, the oil layer pressure is reduced, the layer sand is seriously produced, and in the oil extraction production process, on one hand, in order to prevent stratum sand particles from entering an oil extraction pump, pumping liquid is needed to carry out sand removal treatment; on the other hand, because the energy of the oil layer is reduced, the stratum is seriously lost in the well flushing operation process of the oil well, and the oil layer is polluted, so that the well flushing effect and the subsequent continuous and effective exploitation cannot be ensured.

In the prior art, a production pipe column under a pump is required to be connected with a well flushing protection device and a sand removing and setting device at the same time, and two tools directly influence the integral configuration of the production pipe column, so that the complexity of the production technology pipe column is increased.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide an integrated sand-setting well-flushing protection device, which can solve the technical problems that the existing production pipe column under a pump needs to be connected with the well-flushing protection device and the sand-removing and sand-setting devices at the same time, the two tools directly influence the integral configuration of the production pipe column, and the complexity of the production technology pipe column is increased.

In order to achieve the above object, the present utility model provides the following technical solutions:

the utility model provides an integral type sand setting well flushing protection device, includes the center tube, center tube upper end threaded connection has the top connection, and the lower extreme is connected with the interior separation pipe through the outer tube, the both ends of outer tube respectively with center tube and interior separation pipe threaded connection, outer tube inlet opening has been seted up on the outer tube, interior separation pipe inlet opening has been seted up on the interior separation pipe, be equipped with vortex acceleration helix in the intermediate layer of outer tube and interior separation pipe, vortex acceleration helix sets firmly on the outer wall of interior separation pipe.

Preferably, the well flushing channel is arranged on the upper joint, the well flushing channel is perpendicular to the through hole in the upper joint, a spring seat is arranged in the through hole in the upper joint, a spring is arranged on the spring seat, one end of the spring is abutted against the spring seat, the other end of the spring is abutted against the well flushing valve, the well flushing valve is matched with the well flushing channel, and a sealing leather cup is connected to the outer wall of the upper joint in a threaded manner.

Preferably, the center tube outside cover is equipped with the packing element, packing element upper end threaded connection has a packing element seat, the other end and the sealed leather cup clearance fit of packing element seat, packing element lower extreme threaded connection has a lower packing element seat, the other end and the outer tube clearance fit of lower packing element seat, the packing element is linked together with inner chamber circulation passageway, the inner chamber circulation passageway is seted up on the upper joint.

Preferably, an upper valve and a lower valve are arranged in the inner cavity of the central tube, and are clamped on the conical surface of the inner wall of the central tube.

Preferably, the end face of the vortex speed-increasing spiral adopts a trapezoid drainage sloping dike, and the pitch of the trapezoid drainage sloping dike gradually reduces from the liquid flow inlet end to the liquid flow outlet end.

Compared with the prior art, the utility model has the beneficial effects that: the technical scheme of the utility model is that the structure design integrating well flushing protection, sand removal and sand setting simplifies the complexity of the tool under the pump and improves the operation and construction efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.

Fig. 1 is a sectional view of an integrated sand-setting well-flushing protection device provided by the utility model.

Reference numerals illustrate:

the device comprises a 1-spring seat, a 2-upper joint, a 3-spring, a 4-well flushing valve, a 5-well flushing channel, a 6-inner cavity circulation channel, a 7-sealing leather cup, an 8-upper valve, a 9-upper rubber cylinder seat, a 10-rubber cylinder, a 11-central tube, a 12-lower rubber cylinder seat, a 13-lower valve, a 14-outer sleeve, a 15-outer sleeve liquid inlet hole, a 16-vortex acceleration screw, a 17-inner separation tube and a 18-inner separation tube liquid inlet hole.

Detailed Description

The utility model will now be described in detail, by way of example, with reference to the accompanying drawings, wherein it is evident that the embodiments described are only some, but not all, of the embodiments of the utility model.

As shown in fig. 1, the integrated sand-setting well-flushing protection device comprises a central pipe 11, wherein the upper end of the central pipe 11 is in threaded connection with an upper joint 2, the lower end of the central pipe is connected with an inner separation pipe 17 through an outer sleeve 14, two ends of the outer sleeve 14 are respectively in threaded connection with the central pipe 11 and the inner separation pipe 17, an outer sleeve liquid inlet hole 15 is formed in the outer sleeve 14, an inner separation pipe liquid inlet hole 18 is formed in the inner separation pipe 17, a vortex acceleration spiral 16 is arranged in an interlayer between the outer sleeve 14 and the inner separation pipe 17, the vortex acceleration spiral 16 is welded on the outer wall of the inner separation pipe 17, the end face of the vortex acceleration spiral 16 adopts a trapezoid drainage sloping dike, the pitch of the vortex acceleration spiral gradually reduces from a liquid inlet end to an outlet end, and the outlet flow velocity is higher than the inlet flow velocity under the same fluid state, so that full kinetic energy is provided for sand-removing solid-liquid separation.

When the oil pump performs oil extraction production operation under the suction action of the oil pump, liquid flow enters an interlayer between the outer sleeve 14 and the inner separation pipe 17 from the outer sleeve liquid inlet hole 15, vortex speed-increasing spiral 16 is arranged in the interlayer, the liquid flow moves into a channel of the vortex speed-increasing spiral 16 along the lower inner wall, the liquid flow is sprayed out from the channel and pushes liquid in the interlayer between the outer sleeve 14 and the inner separation pipe 17 to rotate at a high speed, a centrifugal separation is formed by a solid-liquid mixture, solid particles are settled downwards along the inner wall of the outer sleeve 14 and fall into the tail pipe, the liquid flows around the outer wall of the inner separation pipe 17, enters the core part of the inner separation pipe 17 through the inner separation pipe liquid inlet hole 18, flows upwards under the suction pump, and enters the suction pump, so that continuous suction is performed, and an oil layer is extracted from a wellhead.

Further, in this embodiment, the flushing channel 5 has been seted up on the top connection 2, the inside through-hole of top connection 2 is connected to flushing channel 5 perpendicular to, be equipped with spring holder 1 in the inside through-hole of top connection 2, be provided with spring 3 on the spring holder 1, spring 3 one end is inconsistent with spring holder 1, and the other end is inconsistent with flushing valve 4, flushing valve 4 cooperatees with flushing channel 5, threaded connection has sealing cup 7 on the outer wall of top connection 2, sealing cup 7 adopts the pressure expansion formula sealing cup, can play the guard action to the oil reservoir.

In the conventional oil extraction process, the liquid flow temperature extracted from the near wellhead end is obviously lower than the liquid flow temperature at the bottom, the crude oil is extremely easy to solidify and wax on the inner wall of an oil pipe and the surface of a rod body, and the inner diameter of an oil extraction pipe column is reduced after a waxy object is accumulated to a certain thickness, so that an oil extraction channel is blocked, and the later crude oil extraction amount is influenced. In order to meet the production demand of the later period, the production pipe column of the original well is subjected to channel cleaning. During reverse circulation well flushing, well flushing medium is pumped into the well flushing channel 5 through the ground pump truck, the well flushing valve 4 is pushed away through axial force generated by area difference, the spring 3 is compressed, the well flushing medium enters the central pipe 11 for well flushing, and the well flushing medium returns out of the wellhead from the oil pipe, so that reverse circulation well flushing operation is completed.

Further, in this embodiment, the outer side of the central tube 11 is sleeved with a rubber tube 10, an upper end of the rubber tube 10 is in threaded connection with an upper rubber tube seat 9, the other end of the upper rubber tube seat 9 is in clearance fit with a sealing leather cup 7, a lower rubber tube seat 12 is in threaded connection with the lower end of the rubber tube 10, the other end of the lower rubber tube seat 12 is in clearance fit with an outer sleeve 14, the rubber tube 10 is communicated with an inner cavity circulation channel 6, and the inner cavity circulation channel 6 is arranged on the upper connector 2. The upper rubber cylinder seat 9 and the lower rubber cylinder seat 12 are used for supporting and fixing the rubber cylinder 10, so that the rubber cylinder 10 is prevented from sliding back and forth on the sleeve wall. The rubber cylinder 10 adopts an expansion type rubber cylinder, and can protect an oil layer.

Further, in this embodiment, an upper valve 8 and a lower valve 13 are disposed in the inner cavity of the central tube 11, and the upper valve 8 and the lower valve 13 are both clamped on the tapered surface of the inner wall of the central tube 11.

When the energy of the stratum is low, a large amount of well flushing liquid flows into an oil layer, so that the well flushing liquid is lost and the stratum is polluted. The diffusion type leather cup and the expansion type rubber cylinder play a role in protecting an oil layer and effectively prevent a well flushing medium from entering a stratum. When the well flushing liquid reaches the upper part of the sealing leather cup 7, the diffusion type sealing leather cup 7 adopts a deformable soft design, and is flushed by a high-flow-rate medium to expand and cling to the inner wall of the original well casing, so that a downward channel of the well flushing liquid is sealed, a first-stage low-pressure sealing protection barrier is formed, and the pressure can bear 5Mpa; the upper part of the sealing leather cup 7 is provided with an inner cavity circulation channel 6, a part of well flushing medium enters from the inner cavity circulation channel, the expansion type rubber cylinder 10 expands and clings to the inner wall of the original well casing under the continuous pressure of the ground pump truck to complete a secondary high-pressure sealing protection barrier, the pressure can bear 35-70Mpa, and if the sealing leather cup 7 is seriously worn due to overlarge pressure, the expansion type rubber cylinder 10 plays a role of secondary oil layer protection; after the well flushing pressure continues to rise, the well flushing medium opens the only well flushing channel 5, the well flushing valve 4 is pushed away by high pressure, the well flushing medium enters the central pipe 11, the inside of the central pipe 11 adopts a one-way double-valve two-stage sealing design, well flushing liquid is prevented from entering an oil layer from the inside of the tool, and therefore reverse circulation well flushing operation is completed.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, shall cover the scope of the present utility model by equivalent substitution or modification according to the technical scheme of the present utility model and the application concept thereof.

Claims (5)

1. Integral type sand setting well flushing protection device, including center tube (11), center tube (11) upper end threaded connection has upper joint (2), and the lower extreme is connected with interior separation tube (17) through outer tube (14), the both ends of outer tube (14) respectively with center tube (11) and interior separation tube (17) threaded connection, its characterized in that: an outer sleeve liquid inlet hole (15) is formed in the outer sleeve (14), an inner separation pipe liquid inlet hole (18) is formed in the inner separation pipe (17), a vortex speed increasing spiral (16) is arranged in an interlayer between the outer sleeve (14) and the inner separation pipe (17), and the vortex speed increasing spiral (16) is fixedly arranged on the outer wall of the inner separation pipe (17).

2. The integrated sand-setting well-flushing protection device of claim 1, wherein: the well flushing device is characterized in that a well flushing channel (5) is formed in the upper joint (2), the well flushing channel (5) is perpendicular to an inner through hole of the upper joint (2), a spring seat (1) is arranged in the inner through hole of the upper joint (2), a spring (3) is arranged on the spring seat (1), one end of the spring (3) is abutted against the spring seat (1), the other end of the spring is abutted against a well flushing valve (4), the well flushing valve (4) is matched with the well flushing channel (5), and a sealing leather cup (7) is connected to the outer wall of the upper joint (2) in a threaded mode.

3. The integrated sand-setting well-flushing protection device of claim 2, wherein: the utility model discloses a rubber tube, including center tube (11), inner chamber circulation passageway (6) are connected with each other, center tube (11) outside cover is equipped with packing element (10), packing element (10) upper end threaded connection has last packing element seat (9), the other end and the sealed leather cup (7) clearance fit of going up packing element seat (9), packing element (10) lower extreme threaded connection has lower packing element seat (12), the other end and outer tube (14) clearance fit of lower packing element seat (12), packing element (10) are linked together with inner chamber circulation passageway (6), inner chamber circulation passageway (6) are seted up on top connection (2).

4. The integrated sand-setting well-flushing protection device of claim 1, wherein: an upper valve (8) and a lower valve (13) are arranged in the inner cavity of the central tube (11), and the upper valve (8) and the lower valve (13) are both clamped on the conical surface of the inner wall of the central tube (11).

5. The integrated sand-setting well-flushing protection device of claim 1, wherein: the end face of the vortex speed-increasing spiral (16) adopts a trapezoid drainage sloping dike, and the pitch of the trapezoid drainage sloping dike gradually reduces from the liquid flow inlet end to the liquid flow outlet end.