A winding pipe type pipe burst well surrounding device

Abstract

The present invention discloses a winding pipe type pipe burst enclosure device, comprising: a first fixing member, which is used to be fixedly inserted in the ground; a second fixing member, which is used to be fixedly inserted in the ground; a third fixing member, which is used to be fixedly inserted in the ground; the enclosure is in a circular ring shape, which can be detachably arranged on the top of the first fixing member, the top of the second fixing member and the top of the third fixing member; wherein the enclosure is formed by winding a rectangular soft plate, and the bottom end of the soft plate can be detachably arranged on the top of the soft plate. Through the above-mentioned method, the present invention can form a winding pipe by winding the soft plate, so that the enclosure can be quickly surrounded outside the pipe burst mouth by the winding pipe method, and has strong adaptability, and the rescue time is relatively fast, which is more beneficial to controlling the dangerous situation. At the same time, the size of the enclosure can be flexibly changed according to the size of the pipe burst range, and the operation is simple. The enclosure is detachably connected to the fixing member, and the soft plate can be transported alone, or the soft plate can be rolled into a tube for transportation, which is beneficial to the transportation of rescue materials and the rapid control of the dangerous situation.

Description

Technical Field

[0001] The invention relates to the technical field of emergency rescue during flood season, in particular to a winding pipe type pipe burst well enclosure device. Background Art

[0002] Piping refers to the phenomenon that during high water levels during the flood season, water flows from lakes and riverbanks to the downstream along the soil gaps of the embankment foundation (i.e., seepage), and the sandy clay is continuously carried away by the water under the action of seepage force, forming a tubular seepage channel. Especially when rivers flood, earth embankments are prone to piping, which will hollow out the sand layer under the nearby embankment (gate) foundation, and may even cause the embankment (gate) to collapse suddenly, leading to a dam breach disaster.

[0003] Therefore, pipe burst is one of the most serious dangers and must be dealt with immediately once discovered. However, traditional rescue methods mostly rely on bagged sand for artificial well filling, which is inadequate for dealing with pipe bursts. The current rescue methods for pipe bursts on the market have the problem of insufficient response time. From the discovery of pipe bursts to the preparation of materials, the start of construction, to the stabilization of the danger, the entire process is time-consuming and lengthy (often more than 2 hours), especially the transportation process of rescue materials, which is not only time-consuming and labor-intensive, but also greatly affects the efficiency of rescue. At the same time, the inflexibility of traditional rescue materials (such as fixed-size baffles) in use also limits the rapid and accurate implementation of rescue operations, which is extremely unfavorable for the rapid control of dangers. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a winding tube type piping well enclosure device, which can solve the above technical problems.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a wound tube type pipe burst well enclosure device, characterized in that it includes: a first fixing member, used to be fixedly inserted in the ground; a second fixing member, used to be fixedly inserted in the ground; a third fixing member, used to be fixedly inserted in the ground; the well enclosure is in a circular ring shape and can be detachably arranged on the top of the first fixing member, the top of the second fixing member and the top of the third fixing member, wherein a drainage hole is arranged at the top of the well enclosure; wherein the well enclosure is formed by winding a long and rectangular soft board, and the bottom end of the soft board can be detachably arranged at the top of the soft board.

[0008] Furthermore, the soft board is made of high-density polyethylene material, a first clamping structure is provided at the top end of the soft board, and a second clamping structure detachably connected to the first clamping structure is provided at the bottom end of the soft board.

[0009] Furthermore, the first clamping structure is a receiving slot arranged along the length direction of the top end of the soft board, the second clamping structure is a clamping portion arranged along the length direction of the bottom end of the soft board, and the clamping portion is a protrusion extending downward from the bottom end of the soft board.

[0010] Furthermore, a first clamping point is provided on one side of the top end of the receiving card slot, and a second clamping point for clamping the first clamping point is provided at the end of the clamping portion.

[0011] Furthermore, the receiving card slot is in the shape of an elongated rectangle, and the clamping portion is in the shape of an elongated rectangle, wherein the distance between the other side of the top of the receiving card slot and the first clamping point is greater than the width of the clamping portion, and the length between the clamping portion and the second clamping point is greater than the distance between the other side of the top of the receiving card slot and the first clamping point.

[0012] Furthermore, the top of the first fixing member is provided with a first arc-shaped clamping groove for accommodating the bottom end of the soft board, the top of the second fixing member is provided with a second arc-shaped clamping groove for accommodating the bottom end of the soft board, and the top of the third fixing member is provided with a third arc-shaped clamping groove for accommodating the bottom end of the soft board.

[0013] Furthermore, a first inserting portion in a cone shape is provided at the bottom of the first fixing member, a second inserting portion in a cone shape is provided at the bottom of the second fixing member, and a third inserting portion in a cone shape is provided at the bottom of the third fixing member.

[0014] Furthermore, a side wall of the first clamping groove of the first fixing member is provided with a first threaded hole connected to the first clamping groove, and a first screw rod is threadedly connected in the first threaded hole; a side wall of the second clamping groove of the second fixing member is provided with a second threaded hole connected to the second clamping groove, and a second screw rod is threadedly connected in the second threaded hole; a side wall of the third clamping groove of the third fixing member is provided with a third threaded hole connected to the third clamping groove, and a third screw rod is threadedly connected in the third threaded hole.

[0015] Furthermore, the top end of the first fixing member is also spaced apart with a first reinforcement hole and a second reinforcement hole located on both sides of the first clamping groove, wherein the first reinforcement member is installed in the first reinforcement hole, and the second reinforcement member is installed in the second reinforcement hole; the top end of the second fixing member is also spaced apart with a third reinforcement hole and a fourth reinforcement hole located on both sides of the second clamping groove, wherein the third reinforcement hole is installed in the third reinforcement hole, and the fourth reinforcement hole is installed in the fourth reinforcement hole; the top end of the third fixing member is also spaced apart with a fifth reinforcement hole and a sixth reinforcement hole located on both sides of the third clamping groove, wherein the fifth reinforcement hole is installed in the fifth reinforcement hole, and the sixth reinforcement hole is installed in the sixth reinforcement hole.

[0016] Furthermore, it also includes: a geotextile layer, which is arranged in the enclosure; a fine sand layer, which is in the enclosure and above the geotextile layer; a coarse sand layer, which is in the enclosure and above the fine sand layer; and a stone layer, which is in the enclosure and above the coarse sand layer.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a winding tube type pipe burst well enclosure device, which has the following beneficial effects: the winding tube type pipe burst well enclosure device disclosed in the present invention includes: a first fixing member, used to be fixedly inserted in the ground; a second fixing member, used to be fixedly inserted in the ground; a third fixing member, used to be fixedly inserted in the ground; the well enclosure is in a circular ring shape and can be detachably arranged on the top of the first fixing member, the top of the second fixing member and the top of the third fixing member; wherein the well enclosure is formed by winding a long and rectangular soft board, and the bottom end of the soft board can be detachably arranged on the top of the soft board. Through the above-mentioned method, the present invention can form a winding tube by winding a soft plate, so as to quickly surround the well outside the pipe burst mouth by the winding tube method. It has strong adaptability and a relatively fast rescue time, which is more beneficial for controlling the dangerous situation. At the same time, the size of the well can be flexibly changed according to the size of the pipe burst range. The operation is simple, and the well is detachably connected to the fixing part. The soft plate can be transported alone or rolled into a tube for transportation, which is beneficial for the transportation of rescue materials and the rapid control of the dangerous situation. In addition, the winding tube made of high-density polyethylene material is light in weight, has good flexibility, and is easy to install and disassemble. Compared with traditional sandbags, metal wells, etc., the installation process of the winding tube is simpler and faster, which is beneficial for the rapid control of the dangerous situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the winding pipe type piping well enclosure device of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure of the middle well;

[0021] Figure 3 for Figure 1 A schematic diagram of the structure of the fixing parts;

[0022] Figure 4 for Figure 2 Schematic diagram of the cross-section structure of the soft plate of the middle surrounding well;

[0023] Figure 5 for Figure 2 Schematic diagram of the cross-section structure of the soft plate of the middle well after winding and connection;

[0024] Figure 6 for Figure 3 A schematic structural diagram of another embodiment of the fixing member. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] like Figure 1-6 As shown, the coiled tubing type pipe burst well enclosure device disclosed in the present invention comprises a first fixing member 11 , a second fixing member 12 , a third fixing member 13 and a well enclosure 14 .

[0027] The first fixing member 11 is used for being fixedly inserted in the ground, the second fixing member 12 is used for being fixedly inserted in the ground, and the third fixing member 13 is used for being fixedly inserted in the ground.

[0028] The enclosure 14 is in a circular ring shape, wherein the enclosure 14 is detachably arranged on the top of the first fixing member 11 , the top of the second fixing member 12 , and the top of the third fixing member 13 .

[0029] Preferably, a drainage hole 140 is provided at the top of the enclosure 14 to drain the water in the enclosure 14 through the drainage hole 140 .

[0030] In this embodiment, the enclosure 14 is formed by winding a long and rectangular soft board 141 .

[0031] Preferably, the soft board 141 is made of high-density polyethylene material. It should be understood that in this embodiment, the soft board 141 is wound to form a winding pipe, so that the surrounding well 14 is quickly surrounded outside the pipe burst through the winding pipe, which has strong adaptability and a relatively fast rescue time. Since the soft board 141 is made of high-density polyethylene material, the winding pipe formed by the soft board 141 is light in weight, has good flexibility, and is easy to install and disassemble. Compared with traditional sandbags, metal surrounding wells, etc., the installation process of the winding pipe is simpler and faster, which is conducive to quickly controlling the dangerous situation.

[0032] In this embodiment, the bottom end of the soft board 141 is detachably set at the top end of the soft board 141, that is, when the soft board 141 is wound to form the surrounding well 14 of the winding tube, the bottom end of the soft board 141 is set at the top end of the soft board 141 to form a winding tube.

[0033] Preferably, a first clamping structure is provided at the top end of the soft board 141 , and a second clamping structure detachably connected to the first clamping structure is provided at the bottom end of the soft board 141 .

[0034] Specifically, the first clamping structure is a receiving clamping slot 1411 arranged along the length direction of the top end of the soft board 141, and the second clamping structure is a clamping portion 1412 arranged along the length direction of the bottom end of the soft board 141, wherein the clamping portion 1412 is a protrusion formed by extending downward from the bottom end of the soft board 141, that is, when the soft board 141 is wound to form the surrounding well 14 of the winding pipe, the clamping portion 1412 is inserted into the receiving clamping slot 1411, that is, the clamping portion 1412 is accommodated in the receiving clamping slot 1411, and the clamping portion 1412 can also be moved along the length direction of the receiving clamping slot 1411, so the position of the clamping portion 1412 in the receiving clamping slot 1411 can be changed as needed to change the diameter of the surrounding well 14.

[0035] Furthermore, a first clamping point 1413 is provided at one side of the top end of the receiving clamping slot 1411 , and a second clamping point 1414 for clamping the first clamping point 1413 is provided at the end of the clamping portion 1412 .

[0036] Preferably, the receiving slot 1411 is in the shape of an elongated rectangle, and the clamping portion 1412 is in the shape of an elongated rectangle, wherein the distance between the other side of the top of the receiving slot 1411 and the first clamping point 1413 is greater than the width of the clamping portion 1412, and the length between the clamping portion 1412 and the second clamping point 1414 is greater than the distance between the other side of the top of the receiving slot 1411 and the first clamping point 1413, so that when the soft board 141 is wound to form the surrounding well 14 of the winding tube, the clamping portion 1412 at the bottom end of the soft board 141 is inserted from one side end of the receiving slot 1411 at the top of the soft board 141, so that the clamping portion 1412 is tightly clamped in the receiving slot 1411, and the sliding position is changed as needed to achieve the diameter of the surrounding well 14.

[0037] In addition, in some embodiments, in order to enhance the stability of the soft board 141 wound to form the enclosure 14, that is, to prevent the scarf 14 from being easily spread out, such as Figure 4As shown, a side surface of the clamping portion 1412 away from the second clamping point 1414 is provided with a plurality of grooves 1416 at intervals, and the other side wall at the top of the receiving card slot 1411 is provided with a plurality of protrusions 1415 at intervals, wherein the grooves 1416 are used to receive the protrusions 1415, so that when the clamping portion 1412 is received and clamped in the receiving card slot 1411, the plurality of protrusions 1415 are clamped in the plurality of grooves 1416, so that the soft board 141 can only move along the length direction of the receiving card slot 1411, that is, the bottom end of the soft board 141 can only move along the length direction of the receiving card slot 1411. The receiving slot 1411 at the top of the soft board 141 moves in the length direction, and the bottom end of the soft board 141 cannot move along the vertical direction of the receiving slot 1411. In this way, when the soft boards 141 are wound to form the surrounding well 14, the bite force between the soft boards 141 is stronger, that is, the bite at the connection between the top and the bottom of the soft board 141 is more stable and not easy to fall off. This belongs to double bite, the clamping portion 1412 is clamped in the receiving slot 1411 for one level of clamping bite, and the protruding point 1415 is clamped in the groove 1416 for the second level.

[0038] In this embodiment, the top of the first fixing member 11 is provided with a first clip groove 111 in an arc shape for accommodating the bottom end of the soft board 141, the top of the second fixing member 12 is provided with a second clip groove 121 in an arc shape for accommodating the bottom end of the soft board 141, and the top of the third fixing member 13 is provided with a third clip groove 131 in an arc shape for accommodating the bottom end of the soft board 141. It should be understood that when the soft board 141 is wound to form the surrounding well 14 of the winding pipe, the soft board 141 is circular, and the arc-shaped clip groove is provided to better accommodate and clamp the soft board 141.

[0039] Furthermore, a first conical inserting portion 112 is provided at the bottom of the first fixing member 11, a second conical inserting portion 122 is provided at the bottom of the second fixing member 12, and a third conical inserting portion 132 is provided at the bottom of the third fixing member 13, so that the fixing member is easier to be inserted outside the pipe outlet.

[0040] In addition, in order to allow the soft board 141 to be more stably fixed on the fixing member, a side wall of the first clamping groove 111 of the first fixing member 11 is provided with a first threaded hole connected to the first clamping groove 111, wherein the first threaded hole is threadedly connected with a first screw rod 113, so that when the soft board 141 is accommodated in the first clamping groove 111, the first screw rod 113 can be rotated to allow the first screw rod 113 to further squeeze the soft board 141 in the first clamping groove 111, so that the soft board 141 is more stably arranged in the first clamping groove 111.

[0041] Furthermore, a side wall of the second clamping groove 121 of the second fixing member 12 is provided with a second threaded hole connected to the second clamping groove 121, wherein a second screw rod 123 is threadedly connected in the second threaded hole, so that when the soft board 141 is accommodated in the second clamping groove 121, the second screw rod 123 can be rotated to allow the second screw rod 123 to further squeeze the soft board 141 in the second clamping groove 121, so that the soft board 141 is more stably arranged in the second clamping groove 121.

[0042] Furthermore, a side wall of the third clamping groove 131 of the third fixing member 13 is provided with a third threaded hole connected to the third clamping groove 131, wherein a third screw rod 133 is threadedly connected in the third threaded hole, so that when the soft board 141 is accommodated in the third clamping groove 131, the third screw rod 133 can be rotated to allow the third screw rod 133 to further squeeze the soft board 141 in the third clamping groove 131, so that the soft board 141 is more stably set in the third clamping groove 131.

[0043] In addition, in some cases where the water flow of pipe bursts is relatively fast, the impact force of the water is relatively large, and it is difficult to fix it using conventional fixing methods. Therefore, in some embodiments, the top of the first fixing member 11 is also spaced apart with a first reinforcement hole 114 and a second reinforcement hole 115 on both sides of the first clamping groove 111, wherein the first reinforcement hole 114 is installed with a first reinforcement member 116, and the second reinforcement hole 115 is installed with a second reinforcement member 117, so that the soft board 141 can be further clamped and fixed by the first reinforcement member 116 and the second reinforcement member 117, so that the soft board 141 can be more stably set in the first clamping groove 111.

[0044] Preferably, the first reinforcement hole 114 and the second reinforcement hole 115 are both conical threaded holes (threaded holes with a small lower end and a large upper end), and the first reinforcement member 116 and the second reinforcement member 117 are both conical screws (screws with a small lower end and a large upper end), so that the deeper the first reinforcement member 116 and the second reinforcement member 117 are arranged in the threaded hole, the tighter the force with which the first reinforcement member 116 and the second reinforcement member 117 squeeze the soft board 141, and the better the fixation of the well 14.

[0045] Furthermore, the top of the second fixing member 12 is also spaced apart with a third reinforcement hole 124 and a fourth reinforcement hole 125 located on both sides of the second clamping groove 121, wherein the third reinforcement hole 124 is installed with a third reinforcement member 126, and the fourth reinforcement hole 125 is installed with a fourth reinforcement member 127, so that the soft board 141 can be further clamped and fixed by the third reinforcement member 126 and the fourth reinforcement member 127, so that the soft board 141 can be more stably arranged in the second clamping groove 121.

[0046] Preferably, the third reinforcement hole 124 and the fourth reinforcement hole 125 are both conical threaded holes (threaded holes with a small lower end and a large upper end), and the third reinforcement member 126 and the fourth reinforcement member 127 are both conical screws (screws with a small lower end and a large upper end), so that the deeper the third reinforcement member 126 and the fourth reinforcement member 127 are arranged in the threaded hole, the tighter the force with which the third reinforcement member 126 and the fourth reinforcement member 127 squeeze the soft board 141, and the better the fixation of the well 14.

[0047] Furthermore, the top of the third fixing member 13 is also spaced apart with a fifth reinforcement hole 134 and a sixth reinforcement hole 135 located on both sides of the third clamping groove 131, wherein the fifth reinforcement hole 134 is installed with a fifth reinforcement member 136, and the sixth reinforcement hole 135 is installed with a sixth reinforcement member 137, so that the soft board 141 can be further clamped and fixed by the fifth reinforcement member 136 and the sixth reinforcement member 137, so that the soft board 141 can be more stably set in the third clamping groove 131.

[0048] Preferably, the fifth reinforcement hole 134 and the sixth reinforcement hole 135 are both conical threaded holes (threaded holes with a small lower end and a large upper end), and the fifth reinforcement 136 and the sixth reinforcement 137 are both conical screws (screws with a small lower end and a large upper end), so that the deeper the fifth reinforcement 136 and the sixth reinforcement 137 are arranged in the threaded hole, the tighter the force with which the fifth reinforcement 136 and the sixth reinforcement 137 squeeze the soft board 141, and the better the fixation of the well 14.

[0049] In this embodiment, the wrapped tube type pipe burst well enclosure device also includes a geotextile layer, a fine sand layer, a coarse sand layer and a stone layer, wherein the geotextile layer is arranged in the well enclosure 14, the fine sand layer is in the well enclosure 14 and above the geotextile layer, the coarse sand layer is in the well enclosure 14 and above the fine sand layer, and the stone layer is in the well enclosure 14 and above the coarse sand layer.

[0050] Furthermore, in order to further reinforce the well enclosure device, in other embodiments, the first fixing member 11 is provided with a first through hole in the horizontal direction, the second fixing member 12 is provided with a second through hole in the horizontal direction, and the third fixing member 13 is provided with a third through hole in the horizontal direction, wherein a zipper is passed through the first through hole, the second through hole and the third through hole, and the two ends of the zipper are fixed by a lock, so that the zipper connects the first fixing member 11, the second fixing member 12 and the third fixing member 13 together, and the lock can also be fixed at different positions at both ends of the zipper as needed to change the length of the zipper to correspond to the diameter of the well enclosure. Further, the first fixing member 11 is also provided with a first screw to fix the zipper in the first through hole, the second fixing member 12 is also provided with a second screw to fix the zipper in the second through hole, and the third fixing member 13 is also provided with a third screw to fix the zipper in the third through hole, so that the zipper cannot move in the first fixing member 11, the second fixing member 12 and the third fixing member 13.

[0051] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A winding pipe type pipe burst well enclosure device, characterized in that: include: A first fixing member is used for fixing and inserting on the ground; The second fixing member is used for fixing and inserting into the ground; The third fixing member is used for fixing and inserting into the ground; The enclosure well is in a circular ring shape and is detachably arranged on the top of the first fixing member, the top of the second fixing member and the top of the third fixing member, wherein a drainage hole is arranged at the top of the enclosure well; Wherein, the enclosure is formed by winding a long and rectangular soft board, and the bottom end of the soft board is detachably arranged on the top end of the soft board; The soft board is made of high-density polyethylene material, a first clamping structure is provided at the top of the soft board, and a second clamping structure detachably connected to the first clamping structure is provided at the bottom of the soft board; The first clamping structure is a receiving clamping slot arranged along the length direction of the top end of the soft board, and the second clamping structure is a clamping portion arranged along the length direction of the bottom end of the soft board, and the clamping portion is a protrusion extending downward from the bottom end of the soft board; A first clamping point is provided on one side of the top of the receiving card slot, and a second clamping point for clamping the first clamping point is provided at the end of the clamping portion; The receiving card slot is in the shape of an elongated rectangle, and the clamping portion is in the shape of an elongated rectangle, wherein the distance between the other side of the top of the receiving card slot and the first clamping point is smaller than the width of the clamping portion, and the length between the clamping portion and the second clamping point is greater than the distance between the other side of the top of the receiving card slot and the first clamping point; The top of the first fixing member is provided with a first arc-shaped clamping groove for accommodating the bottom end of the soft board, the top of the second fixing member is provided with a second arc-shaped clamping groove for accommodating the bottom end of the soft board, and the top of the third fixing member is provided with a third arc-shaped clamping groove for accommodating the bottom end of the soft board; The first fixing member has a first inserting portion in a cone shape at the bottom, the second fixing member has a second inserting portion in a cone shape at the bottom, and the third fixing member has a third inserting portion in a cone shape at the bottom; A first threaded hole communicating with the first clip groove is provided on one side wall of the first clamping groove of the first fixing member, a first screw rod is threadedly connected in the first threaded hole, a second threaded hole communicating with the second clip groove is provided on one side wall of the second clamping groove of the second fixing member, a second screw rod is threadedly connected in the second threaded hole, a third threaded hole communicating with the third clip groove is provided on one side wall of the third clamping groove of the third fixing member, a third screw rod is threadedly connected in the third threaded hole; The top end of the first fixing member is also spaced apart with a first reinforcement hole and a second reinforcement hole located on both sides of the first clamping groove, wherein the first reinforcement hole is installed in the first reinforcement hole, and the second reinforcement hole is installed in the second reinforcement hole; the top end of the second fixing member is also spaced apart with a third reinforcement hole and a fourth reinforcement hole located on both sides of the second clamping groove, wherein the third reinforcement hole is installed in the third reinforcement hole, and the fourth reinforcement hole is installed in the fourth reinforcement hole; the top end of the third fixing member is also spaced apart with a fifth reinforcement hole and a sixth reinforcement hole located on both sides of the third clamping groove, wherein the fifth reinforcement hole is installed in the fifth reinforcement hole, and the sixth reinforcement hole is installed in the sixth reinforcement hole.

2. The winding pipe type pipe burst well enclosure device according to claim 1 is characterized in that: Also includes: A geotextile layer is arranged in the enclosure; A fine sand layer, located within the enclosure and above the geotextile layer; a coarse sand layer, located within the wellbore and above the fine sand layer; A stone layer is located within the wellbore and above the coarse sand layer.

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