CN216614070U - Underground filtering device for geothermal tail water recharging well - Google Patents

Abstract

The utility model relates to a geothermal tail water recharging well underground filtering device which comprises a primary filter, wherein the upper end of the primary filter is hung on a well head mechanism of a recharging well through a first intermediate connecting piece, the lower end of the primary filter extends into the recharging well, and the primary filter is configured to perform low-precision filtering on tail water; a secondary filter suspended within the recharge well below the primary filter by a second intermediate connector, the secondary filter configured to provide high precision filtration of the tailwater. The utility model can effectively improve the impurity filtering quality of the recharging machine and enhance the recharging effect by arranging the two-stage filter.

Description

Underground filtering device for geothermal tail water recharging well

Technical Field

The utility model relates to the technical field of geothermal water wells, in particular to a geothermal tail water recharging well underground filtering device adopting two-stage filtering.

Background

The ground filtering device is mostly adopted for filtering geothermal tail water at present, so that the investment is large, the operation and maintenance workload is large, and the water quality after filtering is difficult to guarantee before entering a recharge layer due to the problems of scaling, corrosion and the like along the process; in addition, because the recharging well is easily blocked by impurities, the recharging well needs to be periodically lifted and discharged, the operation workload is large, and the recharging well is not beneficial to environmental protection; furthermore, due to the defects of the recharging and filtering system, the sand produced by the water production well is recharged to the recharging well, and the sand washing operation is required to be carried out periodically.

At present, the technical field of geothermal water wells adopts a filtering technology of a filtering bag of a recharging well underground, and the common characteristic of the technology is that single-stage filtering is adopted, namely all impurities are filtered into one filtering bag. However, when the tail water contains sand or has high impurity content, the load of the filter bag is large, the effective period is shortened, and even the serious problem that the filter bag is broken due to the fact that the weight of the filtered impurities is too large, and the underground accident is caused exists.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems, the utility model aims to provide the underground filtering device for the geothermal tail water recharging well, which can realize two-stage filtering in a shaft, realize recharging under pressure and is convenient to install and salvage.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a geothermal tail water recharging well underground filtering device, which comprises: the upper end of the primary filter is hung on a wellhead mechanism of the recharge well through a first intermediate connecting piece, the lower end of the primary filter extends into the recharge well, and the primary filter is configured to filter tail water with low precision; a secondary filter suspended within the recharge well below the primary filter by a second intermediate connector, the secondary filter configured to provide high precision filtration of the tailwater.

Preferably, when the recharging well mainly comprises an upper sleeve and a lower sleeve, a sleeve flange at the upper end of the upper sleeve is connected with a well cover of the wellhead mechanism through a flange short section, the lower end of the upper sleeve is connected with the lower sleeve through a tail pipe hanger, the lower end of the primary filter extends into the upper sleeve, and the lower end of the secondary filter extends into the lower sleeve.

The underground geothermal tail water recharging well filtering device is characterized in that the second middle connecting piece is a hanging joint connected to the upper end of the secondary filter, and the hanging joint is hung on the tail pipe hanger in a setting mode.

Geothermal tail water recharging well underground filter device, preferably, still include middle throwing and fishing mechanism, middle throwing and fishing mechanism includes: the mechanical joint is connected to the upper part of the suspension joint; the rope hook is arranged on the wellhead mechanism or the first middle connecting piece; the lower end of the throwing and fishing rope is connected with the mechanical joint, and the upper end of the throwing and fishing rope is connected with the rope hook.

Geothermal tail water recharging well underground filter device, preferably, still include middle throwing and fishing mechanism, middle throwing and fishing mechanism includes: a mechanical joint connected to an upper portion of the suspension joint; one end of the throwing and fishing rope is connected with ground power equipment; and the throwing and fishing head is connected to the other end of the throwing and fishing rope, and the throwing and fishing head is configured to be in butt joint with or separated from the mechanical joint.

The underground filtering device of the geothermal tail water recharging well preferably comprises the first intermediate connecting piece: the recharge nipple is connected to the lower part of the well lid and communicated with a water inlet pipe on the well lid; the upper end of the connection short section is connected with the recharge short section, and the lower end of the connection short section is connected with the upper end of the primary filter.

The underground geothermal tail water recharging well filtering device preferably comprises a hanging boss and a setting joint, wherein:

the hanging boss is arranged in the top of the upper sleeve, and the setting joint is sealed on the hanging boss;

or the suspension boss is arranged in the flange short section, and the setting joint is sealed on the suspension boss;

or the hanging boss is arranged in the sleeve flange, and the setting joint is sealed on the hanging boss.

The geothermal tail water recharging well downhole filter device preferably comprises the setting joint: the body is in a reducing short section shape with a large upper part and a small lower part; the fishing claw is connected to the upper part of the body; the body is seated on the hanging boss, and the upper end of the primary filter is connected with the lower part of the body.

The underground filtering device of the geothermal tail water recharging well is characterized in that preferably, an inner chamfer is arranged on the hanging boss, an outer chamfer is arranged on the body corresponding to a setting part, and the body is directly set on the hanging boss;

or a sealing element is connected to the lower side part of the body, and the body is seated on the hanging boss through the sealing element.

The underground filtering device for the geothermal tail water recharging well is characterized in that preferably, the primary filter and the secondary filter are formed by alternately connecting one or more filter elements and one or more connectors, a sand setting barrel is connected to the bottom of the filter element at the lowest stage, and the diameter of the secondary filter is smaller than that of the primary filter; wherein, the bottom of the sand setting cylinder is a blind end.

The underground filtering device of the geothermal tail water recharging well is preferably characterized in that a weight is connected to the bottom of the sand settling cylinder of the primary filter and/or the secondary filter.

The underground filtering device of the geothermal tail water recharging well is preferably provided with a ball seat on the hanging joint.

The underground filtering device for the geothermal tail water recharging well preferably further comprises a small-inner-diameter flange ring, wherein the small-inner-diameter flange ring is a flange ring with the inner diameter smaller than the diameter of the body, the small-inner-diameter flange ring is additionally arranged between the casing flange and the flange short section, and the setting joint is set on the small-inner-diameter flange ring;

or the small-inner-diameter flange ring is additionally arranged between the flange short section and the well cover, and the setting joint is set on the small-inner-diameter flange ring.

Due to the adoption of the technical scheme, the utility model has the following advantages:

1. the underground filtering device provided by the utility model can be used for carrying out two-stage filtering on geothermal tail water underground, the filtering precision of the first-stage filter is low, the impurities with larger particle size are filtered, the filtering precision of the second-stage filter is high, and the impurities with smaller particle size are filtered; the filter elements of the first-stage filter and the second-stage filter are adjustable in length and large in flow area, the requirement of geothermal tail water recharge quantity can be met, impurities can be effectively filtered, the requirement of quality of water of recharge water entering a stratum can be met, meanwhile, the filtering period is long, the cost is low, and the system safety is good.

2. The underground filtering device provided by the utility model can be matched with a traditional wellhead device, is convenient to use, has a pressure-bearing condition, can realize recharging under pressure, and is convenient to install and salvage.

3. The underground filtering device provided by the utility model can avoid sand washing operation and save operation cost.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a schematic structural diagram of example 2 of the present invention;

FIG. 3 is a schematic structural diagram according to embodiment 3 of the present invention;

fig. 4 is a schematic structural diagram of embodiment 4 of the present invention.

The figures are numbered:

1-a water supply pipe; 2-well cover; 3-recharging the short section; 4-a sleeve flange; 5-connecting short joints; 6-a connector; 7-a filter element; 8-upper sleeve; 9-a sand setting cylinder; 10-a mechanical joint; 11-a suspension joint; 12-a liner hanger; 13-lower casing; 14-flange nipple; 15-rope hook; 16-throwing and fishing a rope; 17-adding a weight; 18-a ball seat; 19-salvaging a claw; 20-body; 21-a seal; 22-hanging bosses; 23-throwing and fishing head; 24-small inner diameter flange ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used to define elements only for convenience in distinguishing between the elements, and unless otherwise stated have no special meaning and are not to be construed as indicating or implying any relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "hanging", "setting", "top", "upper", "lower", "larger", "smaller", "lower", "high precision", "lower side", "lowering", "raising", "entering", "multi-stage", "between", "composing", "mounting", "connecting", "fastening", "fixing", "fishing", "cartridge" are to be understood in a broad sense, for example, as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment of the utility model provides a geothermal tail water recharging well underground filtering device which comprises a primary filter, wherein the upper end of the primary filter is hung on a well head mechanism of a recharging well through a first intermediate connecting piece, the lower end of the primary filter extends into the recharging well, and the primary filter is configured to filter tail water with low precision; and the secondary filter is suspended in the recharge well below the primary filter through a second intermediate connector and is configured to perform high-precision filtration on tail water. The utility model can effectively improve the impurity filtering quality of the recharging machine and enhance the recharging effect by arranging the two-stage filter.

The underground filtering device for the geothermal tail water recharging well provided by the embodiment of the utility model is described in detail below with reference to the attached drawings.

Example 1:

as shown in fig. 1, the recharge well shown in the embodiment mainly comprises an upper casing 8, a lower casing 13 and a wellhead mechanism, wherein the wellhead mechanism comprises a well lid 2 and a flange short section 14, the upper part of the well lid 2 is provided with an incoming water pipe 1, the lower part of the well lid 2 is connected with a casing flange 4 at the upper end of the upper casing 8 through the flange short section 14, and the lower end of the upper casing 8 is connected with the lower casing 13 through a tail pipe hanger 12. The underground filtering device for the geothermal tail water recharging well provided by the embodiment comprises: the recharge nipple 3 is connected to the lower part of the well cover 2 and communicated with the water inlet pipe 1; the primary filter is arranged in the upper sleeve 8, the upper end of the primary filter is connected with the recharge nipple 3 through a connecting nipple 5, and the primary filter is configured to filter impurities with larger particle size (such as more than 25 mu m) in the geothermal tail water; and the secondary filter is arranged in the lower sleeve 13, the upper end of the secondary filter is connected with a hanging joint 11, the hanging joint 11 is hung on a tail pipe hanger 12 in a setting mode, and the secondary filter is configured to filter impurities with smaller particle sizes (such as 5-25 mu m) in the geothermal tail water.

In the above embodiment, preferably, the apparatus further comprises an intermediate casting and fishing mechanism, and the intermediate casting and fishing mechanism comprises: a mechanical joint 10 connected to an upper portion of the suspension joint 11; the rope hook 15 is arranged on the outer wall of the connecting short section 5; a throwing and fishing rope 16, the lower end of the throwing and fishing rope 16 is connected with the mechanical joint 10, and the upper end of the throwing and fishing rope 16 is connected with the rope hook 15. Of course, the rope hook 15 may also be installed at the manhole cover 2, the recharge nipple 3, the casing flange 4 or any other suitable position according to specific situations.

In the above embodiment, preferably, the primary filter and the secondary filter are composed of one or more filter elements 7 and one or more connectors 6 which are alternately connected, and the bottom of the filter element 7 of the lowest stage is connected with the sand settling tank 9, but the diameter of the secondary filter is smaller than that of the primary filter. Wherein, the bottom of the sand setting cylinder 9 is a blind end, which can be a filter element of a radial deformation structure caused by sand setting resistance, and can also be other materials with proper performance.

In the above embodiment, it is preferable that a weight 17 is connected to the bottom of the sand settling tank 9 of the primary filter and/or the secondary filter to avoid that the filter is not easily thrown due to the buoyancy caused by the low density of the material of the filter element 7.

In the above embodiment, it is preferable that the ball seat 18 is provided on the suspension joint 11 as required, so that the ball can be thrown between the upper casing 8 and the primary filter, which prevents the operation from being disturbed and reduces the contamination of the water in the lower casing 13.

When the underground filtering device for the geothermal tail water recharging well provided by the embodiment is implemented, the implementation process is as follows:

when a downhole filtering device needs to be put into a recharging well, the implementation process is as follows:

s101: according to the required length, the filter element 7, the connector 6 and the sand setting barrel 9 are connected to form a primary filter and a secondary filter, the upper end of the secondary filter is connected with a suspension connector 11, and the upper part of the suspension connector 11 is connected with a mechanical connector 10;

s102: the well lid 2 is opened, and the secondary filter is put into the lower sleeve 13 by a throwing and fishing rope 16;

s103: after the hanging joint 11 at the upper end of the secondary filter is set and hung on the liner hanger 12, the upper end of the throwing and fishing rope 16 is fixed on the rope hook 15, and the secondary filter is put in;

s104: connecting the upper end of the primary filter to the recharge nipple 3, and mechanically lowering the primary filter into the upper sleeve 8;

s104: and the well lid 2 is fastened on the flange short section 14, so that the construction process of the whole set of underground filtering device for entering the recharge well is completed.

When the tail water recharging period is over, the underground filtering device needs to be taken out, and when the impurities in the filter are removed and recycled, the implementation process is as follows:

s201: the connection between the well lid 2 and the flange short section 14 is disassembled, the well lid 2 is lifted up to be opened, the connection between the primary filter and the recharge short section 3 is disassembled, balls are thrown between the upper casing pipe 8 and the primary filter, the pollution to the water quality in the lower casing pipe 13 can be reduced by throwing the balls, and whether the balls can be selectively used according to the situation or not;

s202: after the ball reaches the ball seat 18, the primary filter is mechanically lifted out of the upper casing 8;

s203: after the primary filter is taken out, the upper end of the throwing and fishing rope 16 is detached from the rope hook 15, and the throwing and fishing rope 16 is pulled by a ground power device to take out the secondary filter.

When the underground filtering device for the geothermal tail water recharging well provided by the embodiment is applied, the application process is as follows:

s301: when geothermal tail water recharging is normally carried out, geothermal tail water enters a primary filter from a water inlet pipe 1 on a well cover 2 through a recharging nipple 3, impurities of a large-particle-size machine are filtered and then are precipitated in a sand setting cylinder 9, and primary filtering of geothermal tail water recharging is completed;

s302: in the tail water recharging process, the small-particle-size organic impurities flow out of the primary filter along with the tail water, enter the secondary filter, are filtered and then are deposited in the sand setting barrel 9 to finish the secondary filtering of the geothermal tail water recharging process, and the tail water of the recharging process is recharged to the recharging layer through the two-stage filtering.

Example 2:

as shown in fig. 2, embodiment 2 is different from embodiment 1 in particular in that:

in the embodiment, a hanging boss 22 and a setting joint are adopted to replace the recharging nipple 3 and the connecting nipple 5 in the embodiment 1, wherein the hanging boss 22 can be arranged in the top of the upper casing 8, and the setting joint is set on the hanging boss 22; alternatively, the hanging boss 22 may also be disposed in the flange nipple 14, and the setting joint is set on the hanging boss 22; alternatively, the hanging boss 22 may also be provided in the casing flange 4, with the setting joint being set on the hanging boss 22. The position of the suspension boss 22 can be selected according to the specific situation.

In the above embodiment, preferably, the setting joint mainly comprises the fishing claw 19 and the body 20, the body 20 is in the shape of a reducer nipple with a large upper part and a small lower part, the fishing claw 19 is connected to the upper part of the body 20, the body 20 is set on the hanging boss 22, and the upper end of the primary filter is connected to the lower part of the body 20. Specifically, for example, an inner chamfer may be provided on the hanging boss 22, while an outer chamfer may be provided on the body 20 corresponding to the setting position, and the body 20 is directly set on the hanging boss 22; alternatively, the sealing member 21 may be attached to a side wall of a lower portion of the body 20, and the body 20 may be seated on the hanging boss 22 by the sealing member 21. Because the primary filter is close to the wellhead and can be manually touched, the primary filter can be thrown and fished by connecting the ground power device with the fishing hook with the fishing claw 19.

Example 3:

as shown in fig. 3, embodiment 3 is specifically different from embodiment 1 in that:

the middle throwing and fishing mechanism of the embodiment is different from the embodiment 1, the middle throwing and fishing mechanism mainly comprises a throwing and fishing rope 16 and a throwing and fishing head 23 connected to one end of the throwing and fishing rope 16, the mode of throwing and fishing the secondary filter is also different from the embodiment 1, namely when the secondary filter is lowered into the lower casing 13 in a mechanical mode, the throwing and fishing head 23 is butted with the mechanical joint 10, the other end of the throwing and fishing rope 16 is connected with a ground winch, the ground winch lowers the throwing and fishing rope 16 to slowly lower the secondary filter into the lower casing 13, and after a suspension joint 11 at the upper end of the secondary filter is seated on a tail pipe hanger 12, the throwing and fishing head 23 is unhooked from the mechanical joint 10 to finish the lowering of the secondary filter; when the secondary filter is taken out mechanically, the throwing and fishing head 23 on the throwing and fishing rope 16 is butted with the mechanical joint 10, and after the butt joint is completed, the secondary filter is taken out from the lower sleeve 13 by using a ground winch.

Example 4:

as shown in fig. 4, embodiment 4 is different from embodiment 2 in that:

the embodiment also comprises a small-inner-diameter flange ring 24, wherein the small-inner-diameter flange ring 24 is a flange ring with the inner diameter smaller than the diameter of the body 20, the small-inner-diameter flange ring 24 can be additionally arranged between the casing flange 4 and the flange nipple 14, and the setting joint is seated on the small-inner-diameter flange ring 24; or, the small inner diameter flange ring 24 can also be additionally arranged between the flange short section 14 and the well lid 2, and the setting joint is seated on the small inner diameter flange ring 24. The mounting position of the small-inner-diameter flange ring 24 can be selected according to specific situations.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although embodiments of the present invention have been shown and described, it is clear that the utility model is not restricted to the details of the above exemplary embodiments, since the configuration of the recharging well bore is versatile, the completion casing can be multi-stage, double-stage or single-stage in size, it can be replaced by screens depending on the actual well situation, the well head mechanism can also have other accessories and variants, such as the recharging tail water can also enter the well bore from the water supply pipe connected on the side of the flange nipple, for which the user can choose the appropriate embodiment provided by the utility model. For example, the filter element can be metallic or non-metallic, can be provided with a reinforcing protective layer, and can be conventional. It will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (13)

1. The utility model provides a geothermal tail water recharging well is filter equipment in pit which characterized in that includes:

the upper end of the primary filter is hung on a wellhead mechanism of the recharge well through a first intermediate connecting piece, the lower end of the primary filter extends into the recharge well, and the primary filter is configured to filter tail water with low precision;

a secondary filter suspended within the recharge well below the primary filter by a second intermediate connector, the secondary filter configured to provide high precision filtration of the tailwater.

2. A geothermal tail water recharging well downhole filtering device according to claim 1, characterized in that when the recharging well mainly consists of an upper casing (8) and a lower casing (13), a casing flange (4) at the upper end of the upper casing (8) is connected with the well lid (2) of the wellhead mechanism through a flange nipple (14), the lower end of the upper casing (8) is connected with the lower casing (13) through a tail pipe hanger (12), the lower end of the primary filter extends into the upper casing (8), and the lower end of the secondary filter extends into the lower casing (13).

3. A geothermal tailwater recharge downhole filtering device according to claim 2, wherein the second intermediate connection is a suspension sub (11) connected to an upper end of the secondary filter, the suspension sub (11) being set suspended on the liner hanger (12).

4. The downhole filter apparatus of claim 3, further comprising an intermediate bailing mechanism, the intermediate bailing mechanism comprising:

a mechanical joint (10) connected to an upper portion of the suspension joint (11);

a rope hook (15) mounted on the wellhead mechanism or the first intermediate connector;

the lower end of the throwing and fishing rope (16) is connected with the mechanical joint (10), and the upper end of the throwing and fishing rope (16) is connected with the rope hook (15).

5. The downhole filter apparatus of claim 3, further comprising an intermediate bailing mechanism, the intermediate bailing mechanism comprising:

a mechanical joint (10) connected to an upper portion of the suspension joint (11);

a throwing and fishing rope (16), wherein one end of the throwing and fishing rope (16) is connected with ground power equipment;

and the throwing and fishing head (23) is connected to the other end of the throwing and fishing rope (16), and the throwing and fishing head (23) is configured to be capable of being in butt joint with or separated from the mechanical joint (10).

6. The geothermal tailwater recharging downhole well filtration device of claim 2, wherein the first intermediate connector comprises:

the recharging nipple (3) is connected to the lower part of the well lid (2) and communicated with the water inlet pipe (1) on the well lid (2);

the upper end of the connection short section (5) is connected with the recharge short section (3), and the lower end of the connection short section (5) is connected with the upper end of the primary filter.

7. A geothermal tailwater recharge downhole filtering device according to claim 2, wherein the first intermediate connection comprises a hanging boss (22) and a setting joint, wherein:

the hanging boss (22) is arranged in the top of the upper sleeve (8), and the setting joint is seated on the hanging boss (22);

or the hanging boss (22) is arranged in the flange short section (14), and the setting joint is sealed on the hanging boss (22);

or, the hanging boss (22) is arranged in the sleeve flange (4), and the setting joint is sealed on the hanging boss (22).

8. The geothermal tailwater recharging well downhole filtration device of claim 7, wherein the setting joint comprises:

the body (20) is in a reducing short section shape with a big top and a small bottom;

a salvaging claw (19) connected to the upper part of the body (20);

the body (20) is seated on the hanging boss (22), and the upper end of the primary filter is connected with the lower part of the body (20).

9. A geothermal tail water recharging well downhole filter device according to claim 8, wherein an inner chamfer is provided on the hanging boss (22) while an outer chamfer is provided on the body (20) corresponding to a setting part, the body (20) being directly set on the hanging boss (22);

or a sealing element (21) is connected to the lower side of the body (20), and the body (20) is seated on the hanging boss (22) through the sealing element (21).

10. A geothermal tail water recharge well downhole filter device according to claim 1, wherein the primary and secondary filters are each composed of one or more filter elements (7) alternately connected with one or more connectors (6), and a sand trap (9) is connected to the bottom of the filter element (7) of the lowest stage, but the diameter of the secondary filter is smaller than that of the primary filter; wherein, the bottom of the sand setting barrel (9) is a blind end.

11. A geothermal tailwater recharging well downhole filtration device according to claim 10, characterized in that a weight (17) is connected to the bottom of the sand trap (9) of the primary and/or secondary filter.

12. A geothermal tail water recharge downhole filtering device according to claim 3, characterized in that a ball seat (18) is provided on the suspension joint (11).

13. A geothermal tail water recharging well downhole filter device according to claim 8, further comprising a small inner diameter flange ring (24), wherein the small inner diameter flange ring (24) is a flange ring with an inner diameter smaller than the diameter of the body (20), the small inner diameter flange ring (24) is additionally arranged between the casing flange (4) and the flange nipple (14), and the setting joint is set on the small inner diameter flange ring (24);

or the small inner diameter flange ring (24) is additionally arranged between the flange short section (14) and the well lid (2), and the setting joint is set on the small inner diameter flange ring (24).

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