CN217176572U - Hydraulic conversion liquid drainage sand prevention and sand setting tubular column for oil well - Google Patents

Abstract

The utility model discloses a but oil well hydraulic pressure switching flowing back sand control, sand setting tubular column, tail pipe (10) from bottom to top in proper order with sand setting bridging plug (9), hydraulic switch (8), sand screen (6), packer (4), oil-well pump (3) threaded connection, constitute the production string, the production string is down in oil well sleeve (11), is located the upper portion of artificial shaft bottom (12), sucker rod (2) and oil-well pump (3) piston connection go into down in oil pipe (1) and make piston to oil-well pump (3) pump barrel, hydraulic switch (8) pass sand screen (6) through closely inserting center tube (7) and are connected with oil-well pump (3) standing valve, closely insert between center tube (7) and sand screen (6) center screen pipe annulus (S). The utility model is used for open oil recovery well contains fine sandstone reservoir crude oil of mud powder, improves to the shale content high, the relatively poor nevertheless remaining oil saturation height difference layer of oil reservoir development and thick oil reservoir top height contain mud section development effect, increases crude oil production.

Description

Hydraulic conversion liquid drainage sand prevention and sand setting tubular column for oil well

Technical Field

The utility model relates to an oil field oil recovery technology technical field particularly is a but oil well hydraulic pressure conversion flowing back sand control, sand setting tubular column.

Background

At present, the development difficulty of the high-mud-content silty fine sandstone reservoir of the oil field is high, and the low-grade oil reservoir has high development cost, poor benefit and few related research applications because a low recovery rate strategy is generally adopted in foreign oil fields. Aiming at the poor reservoir, the domestic oil field mainly adopts the following extraction process: (1) sand discharge and oil extraction: the method can solve the partial development problem of fine silt and clay particle migration and blockage, but the excessive sand discharge can cause the aggravation of the sleeve and the high cost. (2) First discharging and then preventing: a certain amount of stratum sand is discharged in the early stage, and sand prevention production is performed in the later stage, so that sand blockage can be slowed down, but the operation frequency is high, and the casing pipe is easy to damage. (3) Fracturing and sand prevention: the high-permeability strip can be manufactured, the permeability can be reduced along with the invasion of the silt in the production process, and the measure cost is high. (4) Replacement and sand prevention: the method is applied to ocean combustible ice exploitation, the development cost is high, and no application case exists for onshore oil exploitation. In the aspect of technical improvement, the method is developed from simple chemical sand prevention or mechanical sand prevention to the deep research and application of chemical deep sand stabilization + shaft mechanical sand prevention; in the aspect of management promotion, influenced by cost pressure, oil well sand control changes from pure technical promotion to fine sand control, and economic benefits are comprehensively considered regardless of sand discharge production or sand control treatment.

Along with the continuous deep development, the sand control process measure object is changed from a main force layer to a non-main force layer for excavation, the thickness of an oil layer is thinner and thinner, the mud content is higher and higher, and the production condition of an oil well is gradually worsened. After the measures are taken to excavate the non-dominant layer section with relatively enriched residual oil, such as the low development, high mud content, oil layer corner and the like, the liquid production amount of the oil well is correspondingly reduced, and the sand prevention period is shortened. For a thin differential layer with high mud content, poor oil layer development and high residual oil saturation and a thick oil layer top high mud-containing section, the conventional sand control process has more low-liquid and low-efficiency wells, so that the problems of reasonable liquid drainage and effective sand control need to be solved, and the combination of ' prevention and release ' is realized, namely ' sand prevention and sand mulling ' can be realized, and ' liquid drainage and sand control integration for long-period production can be realized, so that the development effect of the high mud-containing wells is gradually improved. Therefore, the design of the hydraulic conversion drainage sand control and sand setting tubular column for the oil well is a key technology for solving the problem of crude oil in a fine sandstone reservoir containing mud powder in an oil extraction well.

Disclosure of Invention

The utility model aims at above-mentioned weak point, provide a but oil well hydraulic pressure conversion flowing back sand control, sand setting tubular column for the development well contains fine sandstone reservoir crude oil of silt powder, with improve to the shale content, the relatively poor nevertheless thin poor layer that remaining oil saturation is high of oil reservoir development and thick oil reservoir top height contain the development effect of mud section, increase crude oil output.

The utility model discloses the purpose is realized through following technical scheme:

the utility model discloses a: the device comprises an oil pipe, a sucker rod, an oil well pump, a packer, a bushing, a sand filter pipe, a close-plugging central pipe, a hydraulic switch, a sand setting bridge plug, a tail pipe, a sleeve and an artificial well bottom; the method is characterized in that: the production string is composed of a tail pipe, a sand setting bridge plug, a hydraulic switch, a sand filtering pipe, a packer and an oil well pump in sequence from bottom to top, the production string is arranged on the upper portion of an artificial well bottom in an oil well casing, the sucker rod is connected with an oil well pump piston, a piston is driven into a pump cylinder of the oil well pump from the interior of the oil pipe, the hydraulic switch penetrates through the sand filtering pipe through a tightly-inserted central pipe to be connected with a fixing valve of the oil well pump, and an upper annular space is arranged between the tightly-inserted central pipe and a sand filtering pipe central sieve pipe.

Furthermore, the hydraulic switch is a cylinder, the outer pipe is downwards connected with the lower shell and the outer spring pipe in sequence through threads, the lower portion of the outer spring pipe is connected with the lower connector through threads, the upper portion of the lower connector is sequentially provided with a spring, a spring seat, a lower piston, an eccentric shunt body and an upper piston, a cylinder sleeve is arranged outside the upper piston, the inner diameter of the upper portion of the upper piston is connected with a socket through threads, and a tightly-inserted central pipe is arranged in the socket.

Furthermore, a sealing ring is arranged between the socket and the sealed central tube and is connected with the socket in a sliding and sealing manner.

Furthermore, the eccentric shunt body is a cylinder, an upper through hole and a lower through hole are arranged on the right side of the cylinder, an L-shaped overflowing hole is arranged on the left side of the cylinder, and the upper part and the lower part of the eccentric shunt body are respectively in threaded connection with the upper piston and the lower piston.

Furthermore, the lower part of the cylinder sleeve is provided with a track which is a spiral track groove, the conversion of sand prevention and liquid drainage is realized through long and short tracks, and when a track pin is positioned at a conventional top dead center, the cylinder sleeve is in a normal sand prevention production state; when the rail pin is positioned at the upper dead point of the short rail, the sand discharge channel is opened, and the corresponding sand control liquid inlet channel is closed; the eccentric shunt body, the upper piston and the lower piston move up and down along the track, and the upper piston and the lower piston are pressed to move downwards through pressing of the sleeve to realize reversing.

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 the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not 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 "mounting," "disposing," "connecting," "fixing," "screwing" and the like are to be construed broadly, and may be, for example, fixedly connected or detachably connected or integrated; the components may be mechanically connected, directly connected, or indirectly connected through an intermediate medium, and the components may be connected internally or in an interaction relationship, and unless otherwise specifically limited, the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model is used for open oil recovery well contains fine sandstone reservoir crude oil of silt powder to improve to the development effect that the shale content is high, the relatively poor thin poor layer that nevertheless remains the oil saturation height of oil reservoir development and thick oil reservoir top contain the mud section, realize "preventing, put" the combination, can "prevent sand, reduce the mulling", can realize "long period production flowing back sand control integration" again, increase crude oil output.

Drawings

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

FIG. 1 is a schematic view of a partially cut-away front view of the present invention

In the figure, 1, an oil pipe, 2, a sucker rod, 3, an oil pump, 4, a packer, 5, a bushing, 6, a sand screen pipe and 6-1, a central screen pipe; 7. the device comprises a sealed central tube, 8 parts of a hydraulic switch, 8-1 parts of an outer tube, 8-2 parts of a socket, 8-3 parts of an upper piston, 8-4 parts of a cylinder sleeve, 8-5 parts of an overflowing hole, 8-6 parts of an eccentric shunt body, 8-7 parts of a track, 8-8 parts of a lower piston, 8-9 parts of a lower shell, 8-10 parts of an outer spring tube, 8-11 parts of a spring, 8-12 parts of a lower connector and 8-13 parts of a spring seat; 9. a sand setting bridge plug, 10 tail pipes, 11 casings and 12 artificial well bottoms; s. upper annular space and X. lower annular space.

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 present invention will be further described with reference to the accompanying drawings and embodiments.

Referring to fig. 1, a hydraulic switchable drainage sand control and settling pipe string for an oil well includes: the device comprises an oil pipe 1, a sucker rod 2, an oil well pump 3, a packer 4, a bushing 5, a sand filter pipe 6, a close-plugged central pipe 7, a hydraulic switch 8, a sand setting bridge plug 9, a tail pipe 10, a sleeve 11 and an artificial well bottom 12; the method is characterized in that: the tail pipe 10 is connected with a sand setting bridge plug 9, a hydraulic switch 8, a sand filtering pipe 6, a packer 4 and an oil well pump 3 in a threaded manner from bottom to top in sequence to form a production pipe column, the production pipe column is arranged in an oil well casing 11 and positioned at the upper part of an artificial well bottom 12, the sucker rod 2 is connected with a piston of the oil well pump 3, the piston is driven into a pump cylinder of the oil well pump 3 from the oil pipe 1, the hydraulic switch 8 penetrates through the sand filtering pipe 6 through a tightly-inserted central pipe 7 to be connected with a fixed valve of the oil well pump 3, and an upper annular space S is arranged between the tightly-inserted central pipe 7 and a central sieve pipe of the sand filtering pipe 6. The sand setting bridge plug is provided with a sand setting pocket, so that the sand setting amount can be increased, and the production period is prolonged.

Specifically, the hydraulic switch 8 is a cylinder, the outer tube 8-1 is downwards connected with the lower shell 8-9 and the outer spring tube 8-10 in sequence through threads, the lower portion of the outer spring tube 8-10 is connected with the lower connector 8-12 through threads, the upper portion of the lower connector 8-12 is sequentially provided with the spring 8-11, the spring seat 8-13, the lower piston 8-8, the eccentric shunt body 8-6 and the upper piston 8-3, the cylinder sleeve 8-4 is arranged outside the upper piston 8-3, the upper inner diameter of the upper piston 8-3 is connected with the socket 8-2 through threads, and the socket 8-2 is internally provided with the sealed central tube 7.

Specifically, a sealing ring is arranged between the socket 8-2 and the sealed central tube 7 and is in sliding sealing connection.

Specifically, the eccentric shunt body 8-6 is a cylinder, the right side is provided with an upper through hole and a lower through hole, the left side is provided with an L-shaped overflowing hole 8-5, and the upper part and the lower part of the eccentric shunt body 8-6 are respectively in threaded connection with the upper piston 8-3 and the lower piston 8-8.

Specifically, the lower part of the cylinder sleeve 8-4 is provided with a track 8-7, and an eccentric shunt body 8-6, an upper piston 8-3 and a lower piston 8-8 move up and down along the track 8-7. The switch channel is changed by pressing the control track from the wellhead, and the channel can be changed by pressing 8 MPa.

Specifically, the lower part of the cylinder sleeve 8-4 is provided with a track 8-7, the track 8-7 is a spiral track groove, the conversion of sand prevention and liquid drainage is realized through long and short tracks, and when a track pin is positioned at a conventional upper dead center, the track pin is in a normal sand prevention production state; when the rail pin is positioned at the upper dead point of the short rail, the sand discharge channel is opened, and the corresponding sand control liquid inlet channel is closed; the eccentric shunt body 8-6, the upper piston 8-3 and the lower piston 8-8 move up and down along the track 8-7, and the upper piston 8-3 and the lower piston 8-8 are pressed to move downwards through pressing of the sleeve to realize reversing.

The implementation process principle of the hydraulic conversion drainage sand prevention and sand setting pipe column of the oil well is as follows:

1. according to the process requirements, the sand setting bridge plug is firstly seated at a design position below a production layer, and then the sand setting bridge plug is seated and taken out, so that the purpose of increasing the sand setting capacity and prolonging the production service life is achieved, and the phenomenon that the production cycle is short due to insufficient sand setting capacity of a conventional filter tail pipe plug is avoided.

2. The tail pipe, the hydraulic conversion sand ejector, the sand filter pipe, the hanging packer and the oil pipe are connected from bottom to top at one time, meanwhile, the length data of the sand filter pipe between the hanging packer and the hydraulic conversion sand ejector is accurately measured, and the length of the internal filter sealing insertion pipe is determined according to the measured data so as to ensure that the sealing insertion pipe can be accurately inserted into the hydraulic conversion sand ejector and realize annular sealing.

3. The tail pipe under the hydraulic conversion sand ejector is inserted into the sand setting bridge plug, the sealing and compensation distance between the bridge plug and the tail pipe is realized, and the length of the oil pipe must be calculated in the process to ensure that the tail pipe is inserted into the sand setting bridge plug.

4. After the tail pipe is ensured to be inserted into the sand setting bridge plug and the setting position of the suspension packer is determined, setting of the suspension packer can be carried out, and the construction oil pipe is pulled out and put into the well completion pipe string again after setting is completed.

5. Regarding the state of the hydraulic conversion sand ejector, the sand discharge or the normal production is carried out firstly after the completion according to the process design requirements, the liquid inlet hole is adjusted to the corresponding state through hydraulic pressure by the hydraulic conversion sand ejector before the well is lowered according to the requirements, and the track of the converter is in a long track or a section track.

6. Later stage when the normal production conversion after need carry out the sand discharge or the sand discharge, can suppress to the intraductal injection liquid of cover through the pump truck after the shut-in, make hydraulic pressure conversion sand ejector's reposition of redundant personnel feed liquor hole pass through the track and convert under the effect of pressure. This conversion may be performed in multiple rounds.

The utility model provides a but oil well hydraulic pressure conversion flowing back sand control, sand setting tubular column can effectual extension single well production life cycle, reduces the operating frequency, reduces operation and manufacturing cost expense, can avoid simultaneously to bury the long-time low liquid production that leads to the fact and stop production even because of the sand through the sand discharge construction of many rounds of later stage, thereby can keep the annular space between sand screen and the sleeve pipe and the clean improvement output that can be long-time near well area for a long time through this kind of mode. In the normal production process, once the yield is obviously reduced, sand can be discharged in a conversion mode, and the sand can be discharged into normal production after the sand discharge is finished.

In the process of sand discharge, a small amount of silt can be precipitated in the process of well shut-down conversion, and at the moment, the capacity of a sand setting pocket is increased under the action of a sand setting bridge plug to avoid a lying well caused by sand burying.

The switch is provided with a lateral channel and an upper hollow channel; the upper annular channel corresponds to the sand filter pipe and the inner pipe annular channel, and the lateral channel correspondingly produces sand when the short track is changed; the close insertion is matched with the inner pipe to realize pressure building and sand filtering pipe annulus.

A method for using and operating a hydraulic conversion drainage sand prevention and settling pipe column of an oil well comprises the following steps:

1. firstly, connecting a pump truck pipeline to a sleeve valve;

2. connecting a water inlet pipeline of the pump truck with the tank truck, and ensuring that construction liquid is clean and has no foreign matters such as oil, mud and sand;

3. stopping the well and closing a production flow valve under the conditions of finishing preparation and ensuring safety, and simultaneously sealing and pressing a wellhead packing box;

4. liquid is injected into the sleeve through the pump truck, and the pump truck is opened to discharge to avoid sudden pressure rise. If the liquid level of the working fluid is at a well head or is less than 500 meters, the ground pump truck can slowly raise the pressure to 8MPa and stabilize the pressure for 10 minutes, and then slowly release the pressure, and when the liquid level depth of the working fluid exceeds five hundred meters, the ground pump truck can raise the pressure to 5 MPa and stabilize the pressure for 10 minutes and then slowly release the pressure, so that the damage of a well-remaining pipe column and a casing pipe caused by overhigh pressure is avoided;

5. if the shallow layer of sleeve leakage can not determine the liquid level and the pressure is not stable, the pump truck can be continuously pressed to 8 MPa.

6. After the pressure construction is finished, the wellhead casing valve is closed, the wellhead production valve is opened, the pipeline is disassembled, and the well is opened for production.

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

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (5)

1. The utility model provides a but oil well hydraulic pressure conversion flowing back sand control, sand setting tubular column, includes: the device comprises an oil pipe (1), a sucker rod (2), an oil well pump (3), a packer (4), a bushing (5), a sand filtering pipe (6), a sealed central tube (7), a hydraulic switch (8), a sand setting bridge plug (9), a tail pipe (10), a sleeve (11) and an artificial well bottom (12); the method is characterized in that: tail pipe (10) from bottom to top in proper order with sand setting bridging plug (9), hydraulic switch (8), sand screen (6), packer (4), oil-well pump (3) threaded connection, constitute the production string, the production string is down in oil well sleeve pipe (11), is located the upper portion of artificial shaft bottom (12), sucker rod (2) and oil-well pump (3) piston connection, go into in making piston to the pump barrel of oil-well pump (3) from oil pipe (1) in, hydraulic switch (8) pass sand screen (6) through closely inserting center tube (7) and are connected with oil-well pump (3) standing valve, closely insert and be equipped with annulus (S) between center tube (7) and sand screen (6) center screen pipe.

2. The oil well hydraulic pressure conversion drainage sand control and sand setting pipe column of claim 1, characterized in that: the hydraulic switch (8) is a cylinder, the outer pipe (8-1) is downwards connected with the lower shell (8-9) and the outer spring pipe (8-10) in sequence through threads, the lower portion of the outer spring pipe (8-10) is connected with the lower connector (8-12) in sequence through threads, the upper portion of the lower connector (8-12) is sequentially provided with a spring (8-11), a spring seat (8-13), a lower piston (8-8), an eccentric shunt body (8-6) and an upper piston (8-3), a cylinder sleeve (8-4) is arranged outside the upper piston (8-3), the inner diameter of the upper portion of the upper piston (8-3) is connected with the socket (8-2) through threads, and a sealed central tube (7) is arranged in the socket (8-2).

3. The oil well hydraulic pressure conversion drainage sand control and sand setting pipe column of claim 2, characterized in that: and a sealing ring is arranged between the socket (8-2) and the sealed central tube (7) and is connected in a sliding sealing manner.

4. The oil well hydraulic pressure conversion drainage sand control and sand setting pipe column of claim 2, characterized in that: the eccentric shunt body (8-6) is a cylinder, an upper through hole and a lower through hole are formed in the right side of the cylinder, an L-shaped overflowing hole (8-5) is formed in the left side of the cylinder, and the eccentric shunt body (8-6) is in threaded connection with the upper piston (8-3) and the lower piston (8-8) from top to bottom respectively.

5. The oil well hydraulic pressure convertible liquid discharge sand control and sand setting pipe column as claimed in claim 2, wherein the lower part of the cylinder sleeve (8-4) is provided with a track (8-7), the track (8-7) is a spiral track groove, the conversion of sand control and liquid discharge is realized through a long track and a short track, and when a track pin is positioned at a conventional top dead center, the pipe column is in a normal sand control production state; when the rail pin is positioned at the upper dead point of the short rail, the sand discharge channel is opened, and the corresponding sand control liquid inlet channel is closed; the eccentric shunt body (8-6), the upper piston (8-3) and the lower piston (8-8) move up and down along the track (8-7), and the upper piston (8-3) and the lower piston (8-8) are pressed to move downwards to realize reversing by pressing the sleeve.

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