CN209742862U - Sand prevention water filter pipe for geothermal well - Google Patents

Abstract

The utility model provides a geothermal well sand control water filter pipe, which is provided with a base pipe, a fine filter layer, a coarse filter layer and an outer protective layer from inside to outside in sequence, wherein the outer protective layer is a lateral flow type punching structure; the tube wall of the base tube is radially provided with overflowing holes which are uniformly and densely distributed, and the aperture of the overflowing holes is larger than that of the coarse filter layer; the outer protective layer is a tubular metal protective sleeve, the outer surface of the protective sleeve is provided with rectangular lateral flow grooves which are uniformly and densely distributed, the aperture of each lateral flow groove is larger than that of the coarse filter layer, the fine filter layer is a filter screen, and the coarse filter layer is a wire winding filter screen. The dual purposes of blocking resistance and erosion resistance of the water filter pipe are achieved, the life cycle of the geothermal well is prolonged, the cost is reduced, and the development benefit of the geothermal well is improved.

Description

Sand prevention water filter pipe for geothermal well

Technical Field

The utility model relates to a strainer technical field for geothermal well sand control, more specifically relates to a geothermal well sand control strainer.

Background

Geothermal resources have been incorporated into the "thirteen-five" energy program as a renewable energy source. How to develop and utilize good geothermal resources is one of the strategies of the national energy industry layout, and the effective exploitation of geothermal resources required by people from the underground is a main subject of research of geothermal workers. The common water filter pipe for the open hole suspension filter well completion geothermal well mainly comprises a perforated water filter pipe, a cutting seam water filter pipe, an outer-coated filter screen type water filter pipe, a wire-wound water filter pipe and the like. The adaptability in a sand production geothermal well with high content of fine sand is poor, the aperture of the perforated strainer is generally between 10 and 20mm, the perforated strainer does not have the function of sand prevention, the slotted strainer and the outer-coated strainer are easy to block when meeting the fine sand, and the wire-wound strainer is easy to erode and damage.

Therefore, a sand-proof filter pipe with good filterability, anti-clogging and erosion resistance is urgently needed in the field.

The information disclosed in this background section of the invention is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

For solving this problem, the utility model designs a geothermal well sand control strainer, from inside to outside mainly comprises parent tube, smart filter layer, coarse filtration layer and the outer protective sheath of lateral flow formula, can realize the dual purpose of the anti jam of strainer and resistant erosion to prolong geothermal well's life cycle, reduce cost.

In order to achieve the purpose, the utility model provides a geothermal well sand control water filter pipe, which is provided with a base pipe, a fine filter layer, a coarse filter layer and an outer protective layer from inside to outside in sequence, wherein the outer protective layer is of a lateral flow type punching structure;

The tube wall of the base tube is radially provided with overflowing holes which are uniformly and densely distributed, and the aperture of the overflowing holes is larger than that of the coarse filter layer;

The outer protective layer is the tubulose metal protective sheath, the protective sheath surface is equipped with the rectangle side launder of even densely covered, the side launder aperture is greater than coarse filtration layer aperture.

Preferably, the fine filtering layer is a filtering screen, and the filtering screen is wrapped on the outer surface of the base pipe in a tubular shape.

Preferably, the coarse filtration layer is a wire-wound filter screen, and the wire-wound filter screen is wrapped on the outer surface of the filter screen in a tubular shape.

Preferably, the meshes of the wire winding filter screen are in a trapezoidal structure, so that the wire winding filter screen has a self-cleaning function.

Preferably, the wire winding filter screen is made of stainless steel.

Preferably, the wire-wrapped filter screen pore size is larger than the filter screen pore size.

Preferably, the diameter of the overflowing hole on the base pipe is between 10 and 20 mm.

Preferably, two ends of the axial outer surface of the base pipe are respectively fixed with two metal compression rings, and the two axial ends of the coarse filter layer, the fine filter layer and the outer protective sleeve are in a sealing state and are respectively welded on the two lantern rings.

Preferably, one end of the base pipe is connected with a coupling.

Preferably, the other end of the base pipe is provided with a thread.

The beneficial effects of the utility model reside in that: according to the sand-proof water filter pipe for the geothermal well, the on-site actual requirements of high liquid quantity and high flow rate can be met, and the sand-proof water filter pipe is prevented from being pierced; secondly, the blockage of the shale in the clastic rock geology to the sieve tube is reduced; thirdly, designing a multi-stage sand blocking barrier to prevent the formation from producing sand; and fourthly, the conventional wire-wound sieve tube is prevented from being damaged by the stratum in the process of going into the well by adding an external protective layer, and the external protective layer adopts a lateral flow type punching structure to prevent the sand-containing fluid from directly eroding the filter layer of the water filter tube, so that the dual purposes of blocking resistance and erosion resistance of the water filter tube are realized, the life cycle of the geothermal well is prolonged, the cost is reduced, and the development benefit of the geothermal well is improved.

The present invention and apparatus have other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments of the present invention with reference to the attached drawings, wherein like reference numerals generally represent like parts in exemplary embodiments of the present invention.

fig. 1 shows an overall structure schematic diagram of a sand-proof water filter pipe for a geothermal well according to an embodiment of the present invention.

Fig. 2 shows a schematic enlarged view of a section a-B of a sand-proof water filter pipe for a geothermal well according to an embodiment of the present invention.

Description of reference numerals:

1. A coupling; 2. a base pipe; 3. pressing a ring; 4. a screen filtering layer; 5. a filament winding filter layer; 6. a lateral flow outer protective sheath; A-B, part of sections A to B.

Detailed Description

The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention have been illustrated in the accompanying drawings, it is to be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

According to the utility model, a sand-proof water filter pipe of a geothermal well is provided with a base pipe, a fine filtering layer, a coarse filtering layer and an outer protective layer from inside to outside in sequence, and the outer protective layer is of a lateral flow type punching structure;

The tube wall of the base tube is radially provided with overflowing holes which are uniformly and densely distributed, and the aperture of the overflowing holes is larger than that of the coarse filter layer;

The outer protective layer is a tubular metal protective sleeve, the outer surface of the protective sleeve is provided with rectangular lateral flow grooves which are uniformly and densely distributed, and the pore diameter of the lateral flow grooves is larger than that of the coarse filter layer.

Specifically, outer protective sheath is the metal material and adopts the lateral flow formula structure of punching a hole, and the stratum contains the sand fluid when passing through, produces the stream of detouring, prevents that the stratum contains the sand fluid to the direct erosion of strainer filter layer, adopts coarse filtration layer and smart filter layer to realize the function that the anti fine sand of strainer blockked up, prevents the stratum through multistage sand blocking barrier from producing sand.

In one example, the fine filtration layer is a filter screen, and the filter screen is wrapped on the outer surface of the base pipe in a tubular shape.

Particularly, the filtering screen adopts the domestic optimal screen cloth arrangement mode, meets the requirement of the self sand blocking precision of the filter screen, and enhances the applicability of the screen pipe in geothermal wells with different sand production degrees.

More specifically, the aperture of the filter screen is 0.07mm-0.3mm, the aperture is adjusted according to the size and the homogeneity of the formation sand, and the aperture of the filter screen is 0.6-0.9 times of the median of the formation sand.

In one example, the coarse filtration layer is a wire-wrapped filter screen wrapped in a tubular shape around the outer surface of the filter screen.

specifically, filter screen keeps off sand and wire winding filter screen keeps off sand precision adjustable, and wire winding filter screen filtration aperture ratio is big than filter screen layer, when stratum powder fine sand gets into through the strainer, the wire winding filter screen blocks most powder fine sand outside at first, coarse filtration's effect has been played, the powder fine sand that the part passes through is blocked outside by filter screen, fine filterable effect has been played, use through cooperation between them, thereby double filtration's effect has been reached, the emergence of jam when having prevented single sand layer of keeping off and filtering.

More specifically, the pore size of the wire-wound filter screen ranges from 0.10mm to 1.0mm, and the pore size of the wire-wound filter screen is 1.5 to 3.0 times of the pore size of the filter screen.

In one example, the wire wrap screen mesh is trapezoidal in configuration to provide a self-cleaning function.

In one example, the wire-wrapped filter screen is stainless steel.

In one example, the wire-wrapped filter screen pore size is larger than the filter screen pore size.

specifically, the gap of the wire-wound filter screen is of a ladder-shaped structure, the self-cleaning capability is achieved, and the stainless steel wire welding structure is adopted, so that the strength and the pressure-bearing capability of the screen pipe are improved.

In one example, the diameter of the flow holes on the base pipe is between 10-20 mm.

Specifically, the base pipe 2 is provided with flow passing holes which are uniformly and densely distributed, and the aperture is 10-20mm, so that the filtered fluid can rapidly flow into the water filter pipe.

in one example, two metal press rings are respectively fixed at two ends of the axial outer surface of the base tube, and the two axial ends of the coarse filter layer, the fine filter layer and the outer protective sleeve are in a sealed state and are respectively welded on the two lantern rings.

In one example, a coupling is attached to one end of the base pipe.

in particular, the collar is used to connect upper pipe strings.

In one example, the other end of the base pipe is provided with a thread.

Specifically, the threads of the base pipe are used to connect the lower string.

Example (b):

Fig. 1 shows according to the utility model discloses an embodiment's a geothermal well sand control strainer overall structure schematic diagram, fig. 2 shows according to the utility model discloses a local enlarged schematic diagram of geothermal well sand control strainer of an embodiment.

as shown in fig. 1 and 2, a sand-proof water filter pipe for a geothermal well, wherein a coupling 1 is connected with an upper pipe column, the lower part of a base pipe 2 is provided with threads and is connected with a lower pipe column, the base pipe 2 is sequentially provided with a filter screen 4, a wire-wound filter screen 5 and an outer protective sleeve 6 from inside to outside, the filter screen 4, the wire-wound filter screen 5 and the outer protective sleeve 6 are fixedly welded with the base pipe 2 through a pressing ring 3, and a welding part forms a sealing state, wherein the aperture size range of the filter screen is 0.07mm-0.3mm, the aperture size range of the wire-wound filter screen is 0.10mm-1.0mm, and the aperture of the filter screen is 0.6-0.9 times of the median; the surface of the outer protective sleeve 6 is provided with rectangular bridge-shaped side channels which are uniformly and densely distributed, and the formation sand-containing fluid generates a bypass flow when passing through, so that the formation sand-containing fluid is prevented from directly eroding the filter layer of the water filter pipe, and the aperture of the side channels is larger than that of the wire-winding filter screen 5; the meshes of the wire winding filter screen 5 are in a trapezoidal structure, so that the wire winding filter screen has self-cleaning capability, and the stainless steel wire welding structure is adopted, so that the strength and the pressure bearing capability of the wire winding filter screen 5 are improved; the filtering screen 4 adopts the domestic optimal screen arrangement mode, meets the requirement of the self sand blocking precision of the filter screen, and enhances the applicability of the screen pipe in geothermal wells with different sand production degrees; the base pipe 2 is provided with flow passing holes which are uniformly and densely distributed, the aperture is 10-20mm and is larger than that of the wire-wound filter screen 5, and the filtered fluid can rapidly flow into the filter pipe; when stratum powder fine sand gets into through the strainer, the wire winding filter screen 5 blocks most powder fine sand outside at first, has played coarse filtration's effect, and the powder fine sand that the part passes through is blockked outside by filter screen 4, has played fine filtration's effect, uses through cooperation between them to reach dual filtration's effect, blocked up when having prevented single fender sand layer filtration.

while various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims (9)

1. A sand control water filter pipe for a geothermal well is characterized in that a base pipe, a fine filter layer, a coarse filter layer and an outer protective layer are sequentially arranged from inside to outside of the sand control water filter pipe for the geothermal well, and the outer protective layer is of a lateral flow type punching structure;

The tube wall of the base tube is radially provided with overflowing holes which are uniformly and densely distributed, and the aperture of the overflowing holes is larger than that of the coarse filter layer;

The outer protective layer is a tubular metal protective sleeve, rectangular side flow grooves are uniformly and densely distributed on the outer surface of the protective sleeve, and the pore diameter of each side flow groove is larger than that of the coarse filter layer;

Wherein the diameter of the overflowing hole on the base pipe is between 10 and 20 mm.

2. The sand-control water filter pipe for the geothermal well as recited in claim 1, wherein the fine filtering layer is a filtering screen, and the filtering screen is wrapped on the outer surface of the base pipe in a tubular shape.

3. The sand-proof filter pipe for the geothermal well as recited in claim 2, wherein the coarse filter layer is a wire-wound filter screen, and the wire-wound filter screen is wrapped on the outer surface of the filter screen in a tubular shape.

4. the sand-proof water filter pipe for the geothermal well according to claim 3, wherein the meshes of the wire-wound filter screen are in a trapezoidal structure so as to have a self-cleaning function.

5. The sand-proof filter pipe for the geothermal well according to claim 3, wherein the wire-wound filter screen is made of stainless steel.

6. The sand control strainer of a geothermal well according to claim 3, wherein the wire-wrapped filter screen has a larger pore size than the filter screen.

7. The sand-prevention water filter pipe for the geothermal well according to claim 1, wherein two metal pressure rings are respectively fixed at two ends of the axial outer surface of the base pipe, and the two axial ends of the coarse filtering layer, the fine filtering layer and the outer protective sleeve are in a sealed state and are respectively welded on the two pressure rings.

8. the sand control water filter pipe for the geothermal well according to claim 1, wherein one end of the base pipe is connected with a coupling.

9. The sand control water filter pipe for the geothermal well according to claim 1, wherein the other end of the base pipe is provided with threads.