Anti-scaling sand blocking device

Abstract

The utility model belongs to the technical field of oilfield exploitation, and particularly relates to an anti-scaling sand blocking device which comprises an upper connector, an upper adapter coupling, a central pipe, an outer pipe, an anti-scaling component and a sand blocking device body. A lower end connector of the upper connector is connected with an upper variable buckle coupling, a lower outer buckle of the upper variable buckle coupling is fixedly connected with the upper end of an outer pipe, and a liquid inlet is formed in the outer pipe. The lower inner buckle of the upper variable buckle coupling is fixedly connected with the upper end of the central pipe, the lower end of the central pipe is connected with an outlet of the sand blocking device, the interiors of the central pipe and the sand blocking device are communicated, and the central pipe and the sand blocking device are arranged in the outer pipe and form an annular space. The anti-scaling component is made of copper-based catalyst alloy, is fixedly connected to the position higher than the annular space of the sand blocking device, is tightly attached to the contact face of the center pipe and the outer pipe, and is provided with a structure capable of enabling liquid to pass through, the structure comprises but not limited to a net shape and a hole shape, and it is ensured that the flowing liquid is subjected to anti-scaling treatment; and the scaling of devices and parts through which liquid flows can be effectively prevented, so that the generated water scale is prevented from falling off.

Description

TECHNICAL FIELD

[0001] The utility model relates to oilfield exploitation technical field, concretely relates to a kind of anti-fouling sand blocking device. BACKGROUND

[0002] Oil well sand production is a big problem of oilfield exploitation, many blocks of each oilfield in the country sand production is serious, prone to sand burying plunger, sand sticking pump and other problems, resulting in short pump inspection cycle, even some oil wells cannot be exploited due to serious sand production, workover cost is high, currently mainly using special sand control pump, sand blocking device under pump and other measures.Liquid is filtered through sand blocking device before entering pump, a part of large sand particles is filtered out, does not enter oil pump, objectively reduces the amount of sand into pump, prevents sand sticking pump and sand burying plunger, improves pump inspection cycle.But nowadays oilfield is mostly in exploitation middle-late stage, due to using water injection oil recovery, water content of produced liquid increases, water scaling is inevitable.With the increase of water injection amount, the proportion of downhole water layer is smaller and smaller, the proportion of surface injected water is larger and larger, and the larger the proportion of surface injected water, the more serious the scaling is.Sand blocking device is used to filter sand in liquid, the filter screen pipe gap or filter screen gap must be smaller than the diameter of filtered sand, therefore, sand blocking pipe gap is very small.The gap width of current sand blocking device is obtained through years of field practice, in recent years, produced liquid scaling is serious, a large part of sand-containing oil well, sand blocking device gap becomes smaller due to scaling, increases liquid into pump resistance, the longer the time, the larger the scaling amount, the smaller the gap, the larger the liquid resistance, liquid into pump amount is extremely small, when serious, fullness coefficient is low, which seriously affects pump and subsequent process flow, which is a serious problem of sand blocking device, and needs to be solved urgently. SUMMARY

[0003] To solve the above technical problems, the utility model aims at providing an anti-fouling sand blocking device, which prevents the problems of too small liquid inlet gap, large liquid into pump resistance, extremely small liquid into pump amount and extremely low fullness coefficient caused by scaling, and prevents scaling of oil pump, oil pumping rod column and oil pipe column behind, removes the generated scale, improves the service life of oil pump, prolongs workover cycle and increases oilfield exploitation benefit.

[0004] To achieve the above object, the utility model provides the following technical scheme: A kind of anti-fouling sand blocking device, including upper joint, upper variable buckle connector, central tube, outer tube, anti-fouling component and sand blocking device;The lower end interface of the upper joint is connected with the upper variable buckle connector, the outer buckle of the lower part of the upper variable buckle connector is fixedly connected with the upper end of the outer tube, and the outer tube is provided with liquid inlet;The inner buckle of the lower part of the upper variable buckle connector is fixedly connected with the upper end of the central tube, and the lower end of the central tube is connected with the outlet of the sand blocking device, so that the inside is communicated with each other, and the central tube and the sand blocking device are placed in the outer tube and form annulus;The material of the anti-fouling component is copper-based catalyst alloy, and it is fixedly connected at the annulus higher than the sand blocking device, and the contact surface with the central tube and the outer tube is tightly attached, and is provided with liquid conducting structure, including but not limited to mesh, hole.

[0005] Further, the anti-fouling component is provided with several groups, which are arranged in an upper and lower interval.

[0006] Further, the anti-fouling sand blocking device further includes an upper positioning ring, a lower positioning ring and a positioning sleeve, the uppermost anti-fouling component is fixed by the upper positioning ring arranged above it, the lowermost anti-fouling component is fixed by the lower positioning ring arranged below it, the anti-fouling components are separated by the positioning sleeve arranged on the central tube, the upper positioning ring and the lower positioning ring are welded and fixed on the central tube, the anti-fouling component is an annular sheet, which is arranged on the central tube, the outer edge of each annular sheet is tangent to the inner wall of the outer tube, and the liquid conducting structure on the annular surface of the annular sheet is a circular hole.

[0007] Further, the anti-fouling component is provided with 4-12 groups, the thickness of the anti-fouling component is more than 6mm, and the hole diameter of the hole on the annular surface is 3-5mm.

[0008] Further, the liquid inlet is a circular hole with a hole diameter of more than 10mm.

[0009] Further, the upper joint of the anti-fouling sand blocking device is a tubing connector, which is threadedly connected to the lower end of the oil inlet of the oil pump.

[0010] Further, the anti-fouling sand blocking device is provided with a lifting nipple, which is arranged between the upper joint and the upper variable buckle connector in a threaded connection manner.

[0011] Further, the sand blocking device is composed of a slotted sand control screen and an internal plug, and the central tube and the sand blocking device are threadedly connected by a reducing connector.

[0012] Further, the lower end of the outer tube of the anti-fouling sand blocking device is provided with a sand settling tail pipe.

[0013] Further, the sand settling tail pipe is composed of a tubing coupling, a tubing, and an outer plug, the lower end of the outer pipe is connected with the tubing coupling through a lower box coupling, the lower end of the tubing coupling is connected with the tubing, and the lower end of the tubing is closed by the outer plug, and the connection between the components is a threaded connection.

[0014] The anti-fouling part of the anti-fouling sand blocking device is made of a copper-based catalyst special alloy material, which can prevent the combination of anions and cations in the flowing liquid into scale, and can also make the formed scale fall off. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is an embodiment structure schematic view of the anti-fouling sand blocking device.

[0016] In the figure: 1, upper joint, 2, lifting nipple, 3, upper box coupling, 4, central pipe, 5, liquid inlet, 6, upper positioning ring, 7, outer pipe, 8, positioning sleeve, 9, anti-fouling part, 10, lower positioning ring, 11, reducing coupling, 12, sand blocking device, 121, slotted sand control screen pipe, 122, inner plug, 13, lower box coupling, 14, sand settling tail pipe, 141, tubing coupling, 142, tubing, 143, outer plug. DETAILED DESCRIPTION

[0017] In order to make the personnel in the technical field better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application. Figure 1The embodiment of the application provides a sand blocking device, which comprises an upper joint 1, an upper variable buckle joint 3, a central pipe 4, an outer pipe 7, an anti-fouling part 9 and a sand blocking device 12; the lower end of the upper joint 1 is connected to the upper variable buckle joint 3, the lower outer buckle of the upper variable buckle joint 3 is fixedly connected to the upper end of the outer pipe 7, and the outer pipe is provided with a liquid inlet 5; the lower inner buckle of the upper variable buckle joint 3 is fixedly connected to the upper end of the central pipe 4, the lower end of the central pipe 4 is connected to the outlet of the sand blocking device 12, so that the inside of the central pipe 4 and the sand blocking device 12 are communicated with each other, and the central pipe 4 and the sand blocking device 12 are arranged in the outer pipe 7 and form an annular space; the anti-fouling part 9 is made of copper-based catalyst alloy, is fixedly connected to the annular space higher than the sand blocking device 12, realizes close adhesion with the contact surface of the central pipe 4 and the outer pipe 7, and is provided with a structure that can pass liquid, including but not limited to a mesh structure and a hole structure.

[0018] In some embodiments, the liquid inlet 5 is a circular hole, and the hole diameter is greater than or equal to 10 mm.

[0019] In some embodiments, the upper joint 1 of the sand blocking device is a tubing joint, which is screw-connected to the lower end of the oil inlet of the oil pump.

[0020] In some embodiments, the sand blocking device is provided with a lifting nipple 2, which is arranged between the upper joint 1 and the upper variable buckle joint 3 in a screw-connected manner.

[0021] In some embodiments, the sand blocking device 12 is a combination of a slotted sand control screen pipe 121 and an inner plug 122, and the central pipe 4 and the sand blocking device 12 are screw-connected by a reducing joint 11.

[0022] In some embodiments, the lower end of the outer pipe 7 of the sand blocking device is provided with a sand settling tail pipe 14.

[0023] In some embodiments, the sand settling tail pipe 14 is composed of a tubing joint 141, a tubing 142 and an outer plug 143, the lower end of the outer pipe 7 is connected to the tubing joint 141 in a communicated manner through a lower variable buckle joint 13, the lower end of the tubing joint 141 is connected to the tubing 142 in a communicated manner, the lower end of the tubing 142 is closed by the outer plug 143, and the connection between the components is screw connection.

[0024] In some embodiments, the anti-fouling part 9 is provided with a plurality of groups arranged in an up-down interval.

[0025] In some embodiments, the anti-fouling sand blocking device comprises an upper positioning ring 6, a lower positioning ring 10 and a positioning sleeve 8, the uppermost anti-fouling component 9 is fixed by the upper positioning ring 6 arranged above it, the lowermost anti-fouling component 9 is fixed by the lower positioning ring 10 arranged below it, and the anti-fouling components 9 are separated by the positioning sleeve 8 sleeved on the central pipe 4, the upper positioning ring 6 and the lower positioning ring 10 are welded and fixed on the central pipe 4, the anti-fouling component 9 is an annular sheet sleeved on the central pipe 4, the outer edge of each annular sheet is tangent to the inner wall of the outer pipe 7, and the liquid conducting structure on the annular surface of the annular sheet is a circular hole.

[0026] In some embodiments, the anti-fouling component 9 is provided with 4-12 groups, the thickness of each anti-fouling component 9 is greater than 6 mm, and the diameter of the circular hole arranged on the annular surface is 3-5 mm.

[0027] Since the above embodiments are described in combination with other modes, the same parts exist among different embodiments, and the same and similar parts among the embodiments in the description can be referred to each other. Here, no detailed description is given.

[0028] Working principle

[0029] When normal oil pumping is performed, the anti-fouling sand blocking device starts to work, liquid enters the annular space formed by the outer pipe and the central pipe through the liquid inlet hole in the upper part of the outer pipe, passes through the anti-fouling component in the middle, and then flows downward, enters the inner hole of the central pipe through the sand blocking device, enters the oil pumping pump, and the sand outside the sand blocking device sinks into the sand settling tail pipe and is discharged.

[0030] The anti-fouling component is made of copper-based catalyst alloy, which has the unique functions of releasing free electrons to fluid medium and causing polarization effect of fluid medium without changing the composition and pH of the solution system. After the fluid medium flows through the material at a certain flow rate, the material can cause polarization of the fluid, so that the anions and cations in the fluid are not easy to combine to form scale, and the already hardened scale can be gradually dissolved and detached, achieving the functions of preventing scale and removing scale.

[0031] In the utility model, the "upper" and "lower" mentioned in the component name are only used to indicate the direction, are defined based on the relative position relationship of the components in the technical scheme of the patent, and do not limit the functions, structures or other characteristics of the components, and are only used as descriptive terms for clearly and accurately describing the technical scheme of the patent.

[0032] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the contents of the following claims.

[0033] The above-described embodiments of the application do not constitute a limitation in terms of the protection scope of the application.

Claims

1.A sand control device with anti-fouling function, characterized in that, it comprises an upper joint, an upper variable pin joint, a central pipe, an outer pipe, an anti-fouling component and a sand control device; the lower end of the upper joint is connected to the upper variable pin joint, the lower part of the outer thread of the upper variable pin joint is fixedly connected to the upper end of the outer pipe, the outer pipe is provided with a liquid inlet; the lower part of the inner thread of the upper variable pin joint is fixedly connected to the upper end of the central pipe, the lower end of the central pipe is connected to the outlet of the sand control device, so that the inside of the central pipe and the sand control device are in communication with each other, and the central pipe and the sand control device are arranged in the outer pipe and form an annulus; the anti-fouling component is made of copper-based catalyst alloy, is fixedly connected to the annulus above the sand control device, is tightly attached to the contact surface of the central pipe and the outer pipe, and is provided with a liquid conducting structure, including but not limited to a mesh structure and a hole structure. 2.The sand control device with anti-fouling function according to claim 1, characterized in that, the anti-fouling component is provided with a plurality of groups arranged in an up-down interval. 3.The sand control device with anti-fouling function according to claim 2, characterized in that, it comprises an upper positioning ring, a lower positioning ring and a positioning sleeve; the uppermost anti-fouling component is fixed by the upper positioning ring arranged above it, and the lowermost anti-fouling component is fixed by the lower positioning ring arranged below it; the anti-fouling components are separated by the positioning sleeve arranged on the central pipe; the upper positioning ring and the lower positioning ring are welded and fixed on the central pipe; the anti-fouling component is an annular sheet arranged on the central pipe; the outer edge of each annular sheet is tangent to the inner wall of the outer pipe; and the liquid conducting structure on the annular surface of the annular sheet is a circular hole structure. 4.The sand control device with anti-fouling function according to claim 3, characterized in that, the anti-fouling component is provided with 4-12 groups; the thickness of the anti-fouling component is greater than or equal to 6 mm; and the hole diameter of the hole on the annular surface of the anti-fouling component is greater than or equal to 3 mm and less than or equal to 5 mm. 5.The sand control device with anti-fouling function according to claim 1, characterized in that, the liquid inlet is a circular hole structure with a hole diameter greater than or equal to 10 mm. 6.The sand control device with anti-fouling function according to claim 1, characterized in that, the upper joint of the sand control device with anti-fouling function is a tubing joint, which is threadedly connected to the lower end of the oil inlet of the oil pump. 7.The sand control device with anti-fouling function according to claim 1, characterized in that, the sand control device with anti-fouling function is provided with a lifting nipple, which is arranged in a threaded connection manner between the upper joint and the upper variable pin joint. 8.The sand control device with anti-fouling function according to claim 1, characterized in that, the sand control device is a combination of a slotted sand control screen and an internal plug, and the central pipe and the sand control device are threadedly connected by a variable diameter joint. 9.The sand control device with anti-fouling function according to claim 1, characterized in that, the lower end of the outer pipe of the sand control device with anti-fouling function is provided with a sand settling tail pipe. 10.The sand control device with anti-fouling function according to claim 9, characterized in that, The sand settling tail pipe is composed of a tubing coupling, a tubing and an external plug, the lower end of the external pipe is connected with the tubing coupling through a lower variable buckle coupling, the lower end of the tubing coupling is connected with the tubing, and the lower end of the tubing is closed by the external plug.

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