DESC:CROSS REFERENCE TO RELATED APPLICATIONS
[001] This patent application claims the priority of the Indian Provisional Patent Application No. 1044/CHE/2015 filed on March 04, 2015, titled “A SYSTEM AND METHOD FOR INCREASING YIELD OF A DEPLETED BOREWELL BY USING SHOCK WAVES”, whose contents have been incorporated herein by the way of reference.

A) TECHNICAL FIELD
[002] The present disclosure relates to the field of drilling. Particularly, the present disclosure relates to the field of drilling bore wells. More particularly, the present disclosure relates to the field of replenishing/rejuvenating bore wells.

B) BACKGROUND OF THE INVENTION
[003] With a steady growth in human population since the last decade, the emphasis has been steadily redirected towards conserving water resources for future generations and making efficient use of available water resources. Bore wells have long served as a traditional source of water for household purposes as well as industrial purposes. Typically, after prolonged usage, the yield of bore wells gets depleted drastically. In certain cases, bore wells turn dry after being used for a prolonged time period. One of the major causes for the bore wells turning out lower yield before eventually running dry is the gradual blocking of fissures/cracks underneath the earth surface, due to coagulation of earthen minerals and salts inter-alia. Blocking of fractures/cracks is typically caused by deposition of dissolved salts on cracks/fissures, bacterial activities creating an impermeable layer upon cracks/fissures, accumulation of sand and silt inter-alia in cracks/fissures.
[004] Bore wells are typically rejuvenated through the process of hydraulic fracking which involves injecting water, preferably a large quantity of pressurized water thereto. The water thus injected into the bore well opens up the fractures while flowing through the bore well on the path of least resistance. However, one of the drawbacks of hydraulic fracking is the residual water that fills up the bore well post completion of fracking. The residual water not only pollutes the aquifer and surface water resources but also provides logistical challenges in terms of disposal.
[005] Further, bore wells are also rejuvenated by injecting liquid carbon-di-oxide thereto. The liquid carbon-di-oxide is maintained in a pressurized state while being injected into a bore well and gradually expands into gaseous carbon-di-oxide inside the bore well, expanding the existing cracks in the process. However, use of liquid carbon-di-oxide poses logistical challenges as well as operational challenges including creating a pressure inside the bore well sufficient enough to provide for expansion of liquid carbon-di-oxide into gaseous carbon-di-oxide.
[006] Therefore, in order to overcome the drawbacks associated with the aforementioned methods of rejuvenating bore wells, the present disclosure envisages a system and method that provides for efficient and effective rejuvenation of bore wells.
[007] The above mentioned shortcomings, disadvantages and problems are addressed herein, which will be understood by reading and studying the following specification.

C) OBJECT OF THE INVENTIONS
[008] An object of the present disclosure is to provide a system and method that enables the yield of bore wells to be enhanced.
[009] Another object of the present disclosure is to provide a system and method that provides for new fissures/cracks to be created inside the bore well, and on the walls thereof.
[0010] Yet another object of the present disclosure is to provide a system and method that provides for expanding the cracks existing inside the bore well.
[0011] One more object of the present disclosure is to provide a system and method for provides for rejuvenation of depleted bore wells.
[0012] Still a further object of the present disclosure is to provide a system and method that uses shock waves to replenish depleted bore wells.
[0013] These and other objects and advantages of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.

D) SUMMARY OF THE INVENTION
[0014] The present disclosure envisages a system and method for increasing the yield of bore wells, and especially depleted bore wells. The system envisaged by the present disclosure incorporates a shock tube that generates shock waves. A guide tube is attached to the shock tube for guiding the shock waves into the bore well. The guide tube is aligned inside the bore well using a packer system. The shock tube comprises a driver section and a driven section separated by a diaphragm. The diaphragm is preferably a metal diaphragm. Preferably, a high pressure gas is filled into the driver section and a low pressure gas is filled into the driven section. Shock waves are produced when the metal diaphragm is ruptured due to the application of high pressure gas thereupon.
[0015] Rapid burst of the diaphragm produces a series of pressure waves, each increasing the speed of sound waves behind them, so that the sound waves compress into a shock propagating through the driven section comprising a low pressure gas. The shock waves thus produced are guided to the bottom of the bore well via the guide tube. Typically, the guide tube and the shock tube are connected to one another by an elbow bend. In order to appropriately align the guide tube inside the bore well, a plurality of packer systems are installed at predetermined points of the bore well. While travelling through the bore well, the pressure created by the shock waves act upon the inner walls of the bore well. The pressure thus created clears out the existing fissures/crack of clogs and also creates new cracks/fissures on the inner walls of the bore well, thereby increasing the yield of the bore well.
[0016] These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating the preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

E) BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The other objects, features and advantages will be apparent to those skilled in the art from the following detailed description and the accompanying drawings in which:
[0018] FIG. 1 illustrates a cross section view of a shock tube assembly, in accordance with the present disclosure;
[0019] FIG. 2 illustrates a cross section view of the fracking system, in accordance with the present disclosure;
[0020] FIG. 3A and FIG. 3B are cross section views illustrating the effect of shock waves on the fractures present in the walls of bore well, in accordance with the present disclosure; and
[0021] FIG.4 is a flowchart illustrating the steps involved in the method for enhancing yield of bore wells.
[0022] Certain features of the present disclosure are shown in some drawings and not in others. This has been done only for convenience as each feature may be combined with any or all of the other features, in accordance with the present disclosure.
[0023] Although the specific features of the present invention are shown in some drawings and not in others. This is done for convenience only as each feature may be combined with any or all of the other features in accordance with the present invention.

F) DETAILED DESCRIPTION OF THE INVENTION
[0024] In order to obviate the drawbacks discussed hitherto, the present disclosure envisages a system and method for enhancing the yield of bore wells, and especially depleted bore wells. Referring to FIG.1, there is shown a cross-sectional view of the shock tube assembly 100, in accordance with the present disclosure. The shock tube assembly 100 incorporates a shock tube 103 separated into a driver section 101 a driven section 102. The driver section 101 and driven section 102 are separated by a diaphragm 105. Preferably, the diaphragm 105 is a metal diaphragm.
[0025] Preferably, the driver section 101 is filled with a high-pressure gas. The high-pressure gas is at least one of Helium, (compressed) Air and Nitrogen. The high-pressure gas is preferably transferred from a cylinder 107 to the driver section 101 of the shock tube 103. Preferably, the driven section 102 is filled with a low-pressure gas. The low-pressure gas preferably is atmospheric air. Preferably, the driven section 102 is exposed to the atmospheric air, and therefore is inhibited by atmospheric air maintained at atmospheric pressure.
[0026] In accordance with the present disclosure, when the driver section 101 is filled with high-pressure gas, the high-pressure gas exerts pressure on the diaphragm 105 that separates the driver section 101 from the driven section 101. Due to the exertion of high pressure thereupon, the diaphragm 105 separating the driver section 101 and the driven section 102 is ruptured, thereby providing for a rapid movement of the high pressure gas from the driver section 101 to the driven section 101.
[0027] The rupture of the diaphragm 105 and the resultant rapid movement of the high-pressure gas from the driver section 101 to the driven section 102 creates shock waves. The strength of the shock waves thus created can be calibrated by altering the thickness of the (metal) diaphragm 105 and also by varying the pressure quotient of the high-pressure gas filled in the driver section 101 of the shock tube 103.
[0028] Further, a pressure gauge 108, preferably a digital pressure gauge is communicably coupled to the driver section 101, preferably in proximity to the diaphragm 105. The pressure gauge 108 records the (exerted) pressure at which the diaphragm 105 is ruptured. Further, a plurality of piezoelectric pressure sensor gauges collectively denoted by reference numeral 106 are installed at pre-determined locations of the driven section 102 to record the speed at which the generated shock waves travel through the said pre-determined locations.
[0029] Referring to FIG.2, there is shown a cross sectional view of the fracking mechanism used for rejuvenating bore wells in accordance with the present disclosure. Due to the rupture of the diaphragm and the resultant rapid movement of the high-pressure gas from the driver section to the driven section of the shock tube, a plurality of shock waves are iteratively generated.
[0030] Typically, the shock tube assembly 100 is anchored onto a suitable support system 109 as shown in FIG. 2. The shock waves travelling through the driven section of the shock tube are directed into the bore well using an elbow bend 113. The elbow bend incorporates a ‘ninety’ degree (piping) bend. The elbow bend 113 preferably is a stainless steel piping bend.
[0031] Typically, the generated shock waves are amplified, at least in terms of the speed of travel, within the shock tube assembly 100, due to the Prandtl-Meyer expansion in the elbow bend 113 which creates a higher pressure jump across the shock wave. The amplified shock wave is guided deeper into the bore well using a cylindrical guide tube 120. The diameter of the guide tube 120 is preferably identical to the diameter of the shock tube. One end of the guide tube 120 is attached to an open end 110 of the elbow bend 113. The junction of the guiding tube 120 and the elbow bend 113 is bolted to the bore well casing pipe 111 for stability. To maintain the alignment inside the bore well, a plurality of packer systems 114 are installed at regular intervals. A set of packer system 114 is also installed at the bottom of the tubing string 112 thereby ensuring a confined zone. As shown in FIG. 2, the end of the tubing string 112 is situated above the static water level 119. The ground surface inside the bore well typically comprises a top layered loose soil 121, followed by a clay deposit 115 which rests on a deep rock formation 116. The bore well receives water from a nearby aquifer 117 as shown in FIG. 2. The high pressure shock waves propagate through the tubing string 112 and are released into the rock formation 116 thereby expanding the existing fractures 118 and also creating new fractures.
[0032] FIG. 3A and FIG. 3B are cross sectional views illustrating the effect of shock waves on the fractures present in the walls of bore well 304. FIG. 3A illustrates a tubing string 112 situated above the static water level 119 and FIG. 3B illustrates a tubing string 112 submerged in the static water (the water level being indicated by reference numeral 119). High pressure shock waves 301 from the tubing string 112 enter the confined zone 302 situated below the packer system 114. High pressure shock waves 301 try to penetrate through the cracks/fissures/fractures 303 present on the walls of bore well 304. Further, high pressure shock waves 301 penetrate through the fractures 303 in the rock formation 116 by blowing away the blockage incumbent in the fractures 303. High pressure shock waves 301 further travel through the fractures 303 thereby expanding them. This phenomenon provides for free flow of water into the bore well from a nearby water source such as an Aquifer, thereby enhancing/increasing the yield of the bore well. But when the fractures are found below the static water level 119, and when then the tubing string112 is submerged in static water as shown in FIG. 3B, high pressure shock waves 301 are typically amplified due to the presence of a water medium and impact upon the fractures 303 at a comparatively higher velocity.
[0033] In accordance with the present disclosure, for the shock tube assembly, the pressure levels in the driver section vary from ‘one’ bar to ‘sixty’ bars. The length of the shock tube varies from ‘four’ meters to more than ‘twelve’ meters, while the diameter of the shock tube varies from ‘thirty’ millimeters to ‘one hundred and fifty’ millimeters. The thickness of the diaphragm for the shock tube varies from ‘two’ millimeters to ‘five’ millimeters.
[0034] Referring to FIG.4, there is shown a flowchart illustrating the steps involved in the method for enhancing yield of bore wells. The method, in accordance with the present disclosure comprises the following steps:
bifurcating a shock tube into at least a driver section and a driven section by inserting a diaphragm between the driver section and driven section (400);
filling a high-pressure gas in the driver section, and filling a low pressure gas in the driven section (402);
inserting the shock tube into a bore well, and lowering the shock tube to a predetermined depth, inside the bore well (404);
causing the diaphragm to rupture by applying the high-pressure gas on the diaphragm (406);
generating shock waves inside the shock tube, as a result of rupture of the diaphragm (408); and
creating fractures inside the bore well by applying the shock waves on walls of the bore well, and widening existing fractures inside the bore well by applying the shock waves on walls of the bore well, thereby increasing yield of the bore well (410).
[0035] The foregoing description will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, those skilled in the art will recognize that the embodiments herein can be practiced with modifications.
[0036] Although the embodiments herein are described with various specific embodiments, it will be obvious for a person skilled in the art to practice the embodiments herein with modifications.

G) ADVANTAGES OF THE INVENTION
[0037] The technical advantages envisaged by the present disclosure include the realization of a system and method that enhance the yield of bore wells, and typically depleted bore wells. The present disclosure envisages a system and method that increases the yield of bore wells. The system and method provide for new fissures/cracks to be created inside the bore well, and on the walls thereof. The present disclosure proposes expanding the cracks existing inside the bore well, by using shock waves. The present disclosure also proposes creating new cracks/fissures inside the bore wells, thereby providing for an increase in the yield of the bore wells. ,CLAIMS:1. A system for enhancing yield of bore wells, said system comprising:
a shock tube assembly configured to be inserted into a bore well, said shock tube assembly comprising:
a driver section filled with a high-pressure gas;
a driven section filled with a low-pressure gas;
a diaphragm separating said driver section from said driven section, said diaphragm configured to be ruptured in response to a pressure applied by said high-pressure gas, thereby iteratively creating shock waves;
wherein said shock waves are directed into the bore well for creating fractures in walls of the bore well and for further expanding fractures existing on the walls of the bore well, thereby increasing a flow of water into the bore well.
2. The system as claimed in claim 1, wherein the high-pressure gas filled in said driver section is selected from a group of gases consisting of Nitrogen, Atmospheric air and Helium.
3. The system as claimed in claim 1, wherein the low-pressure gas filled in said driven section is atmospheric air, and wherein said atmospheric air is maintained at a predetermined pressure inside the driven section.
4. The system as claimed in claim 1, wherein said shock tube assembly further includes a pressure gauge, said pressure gauge affixed to a predetermined portion of said driven section, said pressure gauge configured to monitor and record a pressure at which the diaphragm is ruptured.
5. The system as claimed in claim 1, wherein the system further includes an elbow bend attached to the shock tube assembly, said elbow bend configured to amplify the shock waves at least in terms of speed at which said shock waves travel through said driven section.
6. A method for enhancing yield of bore wells, said method comprising the following steps:
bifurcating a shock tube into at least a driver section and a driven section by inserting a diaphragm between said driver section and driven section;
filling a high-pressure gas in said driver section, and filling a low pressure gas in said driven section;
inserting the shock wave tube into a bore well, and lowering the shock tube to a predetermined depth, inside the bore well;
causing the diaphragm to rupture by applying the high-pressure gas on said diaphragm;
generating shock waves inside said shock tube, as a result of rupture of said diaphragm;
creating fractures inside said bore well by applying said shock waves on walls of said bore well, and widening existing fractures inside said bore well by applying said shock waves on walls of said bore well, thereby increasing yield of said bore well.
7. The method as claimed in claim 6, wherein the step of generating shock waves inside said shock tube, further includes the step of iteratively generating the shock waves.
8. The method as claimed in claim 6, wherein the method further includes the step of selectively modifying the thickness of said diaphragm to alter at least pressure associated with generated shock waves.
9. The method as claimed in claim 6, wherein the method further includes the step of selectively tweaking pressure of at least one of said high-pressure gas and said low-pressure gas to alter at least pressure associated with generated shock waves.
10. The method as claimed in claim 6, wherein the step of generating shock waves inside said shock tube, further includes the step of guiding generated shock waves to a predetermined depth inside said bore well via an elbow bend.