MXPA98001802A - Assembly and process for drilling and completing multip wells - Google Patents

Abstract

An apparatus (10) and a process for drilling and filling multiple underground wells of a template is provided which is secured within a sheathed probe extending to the surface. An orientation cam (11) having a bore (20) therethrough is placed above the template in such a manner that the bore through the orientation cam is automatically aligned with one of at least two perforations through the template. Watertight seals are provided between the orientation cam and the casing, and between the orientation cam and one of at least two holes through the template. Then, a drill letter that includes a drill bit is lowered from the surface of the earth through the casing, drilling through the orientation cam and through a perforation through the template to drill a first underground sounding

Description

"SET AND PROCESS FOR DRILLING AND COMPLETING MULTIPLE WELLS" REFERENCE TO RELATED REQUESTS This application is a continuation in part of the copending US Patent Application Serial No. 08 / 508,635, filed July 26, 1995.

BACKGROUND OF THE INVENTION FIELD OF THE INVENTION The present invention relates to an assembly and process for drilling multiple underground wells from a sheathed borehole that extends to the surface, and more particularly, to a set and process for drilling and completing multiple underground wells through a template that has at least two perforations therethrough and which is secured to the casing where the fluid is circulated to the surface during drilling through the casing.

DESCRIPTION OF THE RELATED TECHNIQUE Increasingly, drilling is being drilled in underground formations to an orientation that intentionally deviates from the true vertical by means of conventional probe-guide technology or a mud motor secured in the drill string adjacent to the drill bit of drilling. In the fractured underground formations, deviated wells are used to increase the drainage area defined by the well within the underground formation, and therefore, the increase of hydrocarbon production from the underground formation. An inherent problem in using a conventional guide-probe to prepare a deviated well, is that both the depth and the radial orientation of the guide-probes are graduated when the guide-probes are placed in the borehole and can not be changed without retrieving the guide -sound probes and change the depth and / or radial orientation of the same. In addition, wells drilled from non-coastal drilling platforms are usually diverted to increase the number of wells that can be drilled and completed from a single platform. Non-coastal drilling rigs that are used in deep water to drill and complete wells in an underground formation vary in size, structure and cost, depending on the depth of the water and the loads where the platform will be installed. For example, a platform can be constructed to be supported in part by a leg or cacetón that extends to the floor of the ocean or by many such as eight of these legs or cacetones. The costs of these non-coastal drilling rigs range from approximately 5,000,000 million dollars to 500,000,000,000,000 dollars. Each non-coastal drilling rig is equipped with a graduated number of slots through which deviated wells can be drilled and completed through the cladding pipes that are secured to the platform, by conventional techniques. Due to the significant capital expenditure required for these non-coastal platforms, templates and processes have been developed to drill and complete the multiple cased wells. During drilling operations using these templates, a conventional tubular vertical tube is lowered into the surface or intermediate casing and inserted into one of the perforations formed through the template. Once the vertical tube is properly positioned within the bore, the surface or intermediate casing is cemented into the borehole by conventional techniques, and a conventional drill string, including a drill bit and a mud motor (not illustrated) is transported inside the vertical tube towards the template perforation, after which the flotation valve or plug and any cement is drilled out of the template perforation. Then, drilling is drilled through the drillstring in a conventional manner with drilling mud and cuttings of the formation being circulated out of the borehole to the surface through the riser. The drill string is then removed from the vertical tube and, after it is equipped with any of the tubulars, the vertical tube is removed from the perforation of the template, rotated and inserted into another perforation through the template. Then, an additional well can be drilled and completed in the manner just described. However, the manipulation of the vertical tube on the surface to insert the same inside and outside a given hole through a multiple well template that is placed inside the sheathing sounding at depths of up to 283.20 cubic meters or more, and to make turning the vertical tube to insert in another hole, can be problematic. Therefore, there is a need for a set and process to drill and complete multiple wells wrapped through a multiple well template placed inside a well lined in an underground location that eliminates the need to use a vertical tube at the bottom of the well. hole to connect a subsurface template or from the bottom of the well up to the surface. Accordingly, it is an object of the present invention to provide an assembly and process for preparing and completing multiple wells within the underground formation (s) of a sheathed survey that eliminates the need to use a vertical tube along with it.

COMPENDIUM OF THE INVENTION In order to achieve the aforementioned objects, and others and in accordance with the purposes of the present invention, as comprehensively described and described herein, a characterization of the present invention is a process for drilling underground wells from a casing that is It extends from an underground depth to the surface of the earth and to which a bottom or subsurface template that has at least two perforations through it is secured. The process comprises drilling a first underground well through one of the perforations through the template and into an underground formation and circulating the fluid to the surface through the casing during the drilling step. In another characterization of the present invention, a process is provided for drilling underground wells from a casing extending from an underground depth to the surface of the earth and to which a bottom or bottom subsurface template is secured. At least two perforations through it. The process comprises placing an orientation cam having a bore through it above the template such that the perforation through the orientation cam is aligned with one of at least two perforations through the template . A fluid tight seal is provided between the orientation cam and the casing. A fluid tight seal is also provided between the orientation cam and one of at least two perforations through the template.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated and form part of the specification, illustrate the embodiments of the present invention and, together with the description, serve to explain the principles of the invention. In the drawings: Figure 1 is a perspective view of one embodiment of the assembly of the present invention that includes a positioning cam and a tubular seal assembly and that is used in conjunction with a subsurface multiple well template or the bottom of the water well; Figure 2 is a partially recessed perspective view of the illustrated assembly of Figure 1; Figure 3 is a partially recessed 360 ° expanded view of the external surface of the positioning cam of the present invention; Figure 4 is a cross-sectional view of a bottomhole or subsurface template; Figure 5 is a partially recessed perspective view of the assembly of Figures 1 and 2, illustrating the seal assembly thereof positioned within a bore of a multi-well subsurface template; Figure 6 is a partially recessed perspective view of another embodiment of the assembly of the present invention, illustrating the seal assembly thereof sealably seated within a bore of a multi-well subsurface template; Figure 7 is a cross-sectional view of yet another embodiment of the assembly of the present invention, illustrating the seal assembly thereof as being sealably seated within a bore of a multi-well subsurface template; Figure 8 is a perspective view of the positioning cam of the present invention that is used in conjunction with a tubular seal assembly and a multiple well subsurface template; Figure 9 is a perspective view of certain component parts of the positioning cam of the present invention; Figure 10 is a schematic illustration of the configuration of the groove that is formed on the outer surface of the seal assembly of the present invention; Figure 11 is a cross-sectional view of the embodiment of the assembly of the present invention illustrated in Figure 7, illustrating the seal assembly thereof as it is removed from coupling from a borehole of a well subsurface template multiple and that is aligned with another perforation of the subsurface template of multiple wells; and Figure 12 is a cross-sectional view from the assembly of the present invention illustrated in Figure 7, illustrating the seal assembly thereof as it is sealably placed within another perforation of a multi-well subsurface template.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES As illustrated in Figure 1, the assembly of the present invention, which is generally illustrated as 10, facilitates drilling and the manner of completing multiple wells by means of bottomhole or subsurface templates, such as the template described in FIG. U.S. Patent No. 5,330,007, which is incorporated herein by reference. The apparatus 10 comprises a positioning cam 11 and a tubular seal assembly 40 which is secured in and depends on the cam 11 in the manner that will be described below. The cam 11 is provided with at least one annular seal 12, for example a molybdenum glass toric seal (s), such as that made by Baker Oil Tools, around the outer periphery thereof and a groove 14 J -4 formed on the external surface 13 thereof.

The cam 11 is provided with a perforation 20 therethrough (Figure 2). The perforation 20 has a first portion 22 uniformly tapered, a second annular portion 23 generally concentric, a third portion 24 tapered non-uniformly, and terminates in an axially offset portion. A general annular profile 19 is provided on the cam 11 adjacent to the second annular portion 23 of the bore 20. The lower portion of the cam 11 is provided with screw threads 26. The tubular seal assembly 40 is provided with a bore 49 through it, at least one annular seal 42, for example, a molybdenum glass toric seal (s) as manufactured by Baker Oilt Tools and a mandrel 44 having a plurality of fingers 47. Each finger is pushed outward and a corresponding portion of the outer surface of each finger is threaded. Above the mandrel 44, the outer surface of the tubular 40 is provided with threads 41. Since the cam 11 and the tubular assembly 40 are assembled before being matched with a multi-well template and placed in a subsurface location within In a probing, the threaded section 41 of the tubular seal assembly 40 engages the internal threads 26 of the cam 11. An example of an appropriate bottom or subsurface template is illustrated in Figure 4 generally as 100 and consists of a first upper section 101, an elongate frame 107 and a plurality of tubular members 104. The first upper section 101 is provided with two perforations therethrough which have lower threaded sections 102. The end face 112 of the first section 101 is formed with indentations 115, 116 that surround the intersection of the two perforations. An elongated frame, for example, an "I" beam or "H" beam 107, is secured to the other end face of the first section 101 by any appropriate means such as by bolts. In general, the "C" -shaped guides 109 are secured to the "I" beam or the "H" beam 107 along the length of the beam by, for example, welds. The tubular members 104 are placed through the guides 109 on either side of the "I" beam or the "H" beam 107 and are made to match the threaded sections 102 of the perforations through the first section 101. The guides 109 function in combination with the elongate frame 107 to restrain and inhibit movement of the tubular member (s) 104, positioned through these guides. The different tubular members 104 placed on the same side of the "I" beam or the "H" beam 107 are secured together by any appropriate means, for example, the threaded collar 105. The free end of each tubular member 104 is matched to a shoe 106 wherein a float valve 126 is secured to one side of the "I" beam or the "H" beam 107, while a plug 136 is inserted. on the other side of the beam 107. As illustrated in Figure 4, the perforations 120, 130 each are provided with first sections 121, 131, second sections 123, 133 and third sections 125, 135 respectively. The first and second sections of the perforations 120, 130 define the annular shoulders 122, 132 between them, while the second and third sections of the perforations 120, 130 define annular shoulders 124, 134 therebetween. The perforations 120, 130 can be positioned so as to diverge from each other from the end face 112 towards the end faces 114, 113, respectively. If set to diverge, the degree of this divergence usually should not exceed 2 ° across the entire length of the template 100, and is preferably less than Io. In the embodiment illustrated in Figure 4, the perforation 130 is shorter than the perforation 120, so as to provide a portion of the subterranean formation between the end faces 113 and 114 within which the drill string exiting the perforation 130 may be biased so as to minimize the possibility of interference between the drillings that are drilled and completed in accordance with the present invention. The perforations 120 and 130 can be essentially identical in length. In either embodiment, one or both sides of the "I" beam 107 may be provided with a guide (s) -sonings secured therein below the perforation (s) 120 and / or 130 by any appropriate means, such as by welding, to further assist in minimizing interference between the drilled holes using the template 100 in accordance with the present invention. As assembled in this manner, the first section 101, the beam 107 and the tubular members 104 define a template 100 having two generally cylindrical perforations 120, 130 therethrough. Examples of the relative dimensions of the template 100 may be the length of the first section of 1.22 meters, the beam 107 may be 9.14 meters and the intermediate or superspherical casing 90 may be 2.44 meters. Where each perforation does not extend beyond the frame 107, the length of the perforation 130 as measured from the bottom of the first section 101 to the end face 113 can be up to 9.14 meters or less, while the length of the perforation 120, as measured from the bottom of the first section 101 to the end face 114, can be up to 13.72 meters or less. When the perforation 130 extends beyond the frame 107, the length of the perforation 130, as measured from the bottom of the first section 101 to the end face 113, can be up to 1000 meters or more. The perforation 120 is longer than the perforation 130 and may extend, as measured from the bottom of the first section 101 to the end face 314, up to 3,048 meters or more, depending on the formations to be drilled and completed. according to the present invention. As illustrated in Figures 4 and 5, the template 100 is preferably secured to a section of the conductive, surface or intermediate coating pipe 90 by any appropriate means, such as by threads or welds. The casing pipe 90 is provided with an inwardly extending detent or key 92. The external surface of the cam 11 is provided with a slot J-4 number 14 that together with the key 92 functions to orient the tubular pipe 40 to be inserted in either the bore 120 or 130, in the manner described below . During operation, the template 100 is secured to the lower section or union of the surface or intermediate casing 90 on the surface, by any appropriate means, such as screw threads. The assembly 10 is lowered into the bottom section or the junction of the surface or intermediate casing pipe 90 until the key 92 comes into contact with the slot 14 on the external surface of the cam 11. The inclined surfaces of slot 14 causes cam 11 and tubular seal assembly to rotate until key 92 assumes 14A position, as illustrated in Figure 3. Oriented in this manner, the tubular seal assembly 40 will be aligned with and positioned within the bore 120 of the template 100 in such a manner that the fingers 47 of the mandrel engage the threaded section 127 of the perforation 120 and seal (s) 42 of seal assembly 40 engage the internal walls of the first section 121 of bore 120, so as to provide a fluid tight seal therebetween. As illustrated in Figures 2 and 5, the annular seal (s) 12 of the assembly 10 engages the inner surface of the lower section or gasket of the surface or intermediate casing pipe 90 in order to provide a fluid tight seal between the same. Preferably, the inner surface of the lower section or joint or junction of the surface or intermediate coating pipe 90 is polished to ensure the integrity of the seal formed during engagement by the annular seal (s) 12 of assembly 10. As shown in FIG. Assembled in this manner, the surface or intermediate casing 90 is placed within the bore 54 by securing additional sections or casings of the casing together in a conventional manner as the casing string is lowered into the borehole. as will be evident for an expert craftsman. The casing 90 is then cemented into the bore 54 by conventional techniques. A conventional drill string including a drill bit and a mud motor (not shown) is lowered into the casing 90 and passed through the bore 20 by means of a first and third tapered portions 22 and 24 through the perforation 49 in the seal assembly 40, and into the perforation 120 of the template 100 after which the valve 126 and the cement if any are drilled out of the perforation 120. Then, a first drilling is drilled by the drill string in a conventional manner as will be evident to an expert artisan, with the drilling mud and the cuttings of the formation being circulated out of the borehole and through bores 20 and 49 in the assembly and the casing pipe 90 to the surface. The seals 12 and 42 function to isolate for the perforation 130 of the jig and a significant portion of the external surface of the cam 11 and the drilling mud seal assembly 40 circulated. This first sounding can be punctured in a vertical or offset orientation. Then, the drill string that pulls to the surface and the casing that is equipped with a hanger can be lowered towards the first drill through holes 20 and 49 in the set by means of the drill pipe and secured to the template 10 and it is fixed with cement inside the first sounding by conventional techniques. The drill string is equipped with an appropriate traction tool near the bottom end of the drill string. The drill string is lowered into the casing 90 and is placed through the bore 20 by means of the first and third tapered portions 22 and 24 until the pulling tool is engaged within the annular profile 19 in the bore. 20 of the assembly 10. The drill string then rises, thereby causing the fingers 147 of the mandrel to disengage from the threaded section 127 of the bore 120 so as to allow the assembly 10 to be lifted until the key coupling is engaged. 92 with the slot 14 causes the orientation cam 11 to rotate automatically until the key 92 assumes the position 14b within the slot 14 (Figure 3). Subsequently, the descent of the drill string causes the cam to rotate until the key 92 is positioned at 14c within the slot 14. In this orientation the stamp assembly 14 - II The tubular will be aligned with and positioned within the perforation 130 of the template 100 in such a manner that the fingers 47 of the mandrel engage the threaded section 137 of the bore 130 and the seal (s) 42 of the seal assembly 40 engage the internal walls of the seal. the first section 131 of the perforation 130 in order to provide a fluid tight seal therebetween. As illustrated in Figures 2 and 5, the annular seal (s) 12 of the cam 11 engages the inner surface of the lower section or the junction of the surface or intermediate coating pipe 90 in order to provide a seal that fluid between them. Then, the drill string is used to drill the plug 136 out of the perforation 130 of the template 100. The drill string is passed through the perforation 30 and a second drill is drilled in a conventional manner with the drilling mud. and the cutouts of the formation being circulated outwardly from the second sounding and through the perforations 20 and 49 in the assembly and the casing 90 towards the surface. The seals 12 and 42 function to isolate the perforation 120 from the jig, and a significant portion of the external surface of the cam 11 and seal assembly 40 from the drilling mud circulated. The second sounding can also be drilled in a vertical or deflected orientation. Next, the drill string is pulled up to the surface. The casing that is equipped with an appropriate hanger is then lowered into the second drill through the perforations 20 and 49 in the assembly 10, by means of the drill pipe and secured in the template 11 and therefore, in the surface or intermediate coating pipe 90, by conventional means. The casing can be fixed with cement inside the second sounding. The drill string is equipped with an appropriate traction tool and lowered into the drill pipe 90 until the traction tool is engaged with the annular groove 19 in the bore 20. Subsequent lifting of the drill string causes the fingers 147 of the mandrel are disengaged from the threaded section 137 of the bore 130. The engagement of the key 92 in the groove 14 causes the pocket 92 to disengage from the groove 14 thus allowing the drill string and the assembly 10 rise up to its surface. The assembly 10 can be used in conjunction with a well-hole drilling template at the bottom of the well or sub-surface to drill and complete the wells from offshore drilling rigs and subsea wellheads or non-coastal platforms.

In accordance with another embodiment of the present invention, as illustrated in Figure 6, the cam 11 is provided as a threaded bore 30 on one face thereof adjacent the axially non-coastal portion 20 of the bore 20. The cam 11 and the tubular assembly 40 are assembled by engaging the threaded section 41 of the tubular seal assembly 40 within the threaded bore 30 of the cam 11. As constructed in this way, when the tubular seal assembly 40 is aligned with and positioned within the perforation 130 of the template 11 in the manner described above with reference to Figures 1 to 5, the perforation 20 of the cam 11 will work to introduce a conventional drill string into the perforation 120 of the template 100 during drilling operations, as described above. Another embodiment of the assembly of the present invention is illustrated in Figure 7. The apparatus of the present invention is generally illustrated as 200 and comprises a positioning cam 211 and a tubular seal assembly 240, which is secured in and depends on the cam 211 in the manner that will be described below. Cam 211 is provided with at least one annular seal 212, for example, the molybdenum glass toric seal (s) such as that made by Baker Oil Tools around the outer periphery thereof and a groove J-4 214 formed on the outer surface 213 thereof (FIG. 8). The cam 211 is also provided with a bore 220 therethrough of varying diameter in order to define the first and second annular shoulders 221 and 222. At least one annular seal 223, for example, a molybdenum glass toric seal (s) as manufactured by Baker Oil Tools is provided around the outer periphery of the perforation 220 about one end thereof. A pin 215 having an enlarged head portion 216 is positioned within the bore 217, which extends through the cam 211 from the bore 220 to the outer surface 230. A tubular seal assembly 240 is provided with a perforation 249 therethrough and consists of sections that are secured together by any appropriate means, such as screw threads, thereby defining an external, generally annular, shoulder 241. An end portion 242 of the tubular seal assembly 240 is enlarged so as to define an annular shoulder 244 about the external diameter of the assembly 240. A bevelled profile 243 is provided within the inner surface of the enlarged end portion 242, while a slot 247 (Figure 10) is provided on the outer surface of the intermediate tubular seal assembly 240 to the length thereof. A slot 218 (Figure 8) is formed on the outer surface 213 of the cam 211, and preferably has a generally longitudinal orientation. A locking mechanism generally illustrated as 250 in Figure 9, comprises a generally cylindrical body 251 and having a notch or groove 252 formed in one end face thereof, and a tongue or protrusion 253 projecting from the other side of the end of it. An elongate bar 254 is placed within the slot 252 intermediate the length of the bar 254. As assembled, the bar 254 is placed within the slot 218 and the cam 211, and the body 251 is placed inside a perforation 228 extending through cam 211 from perforation 220 to external surface 230. Preferably, the perforation 228 is not radially aligned with the perforation 217 as illustrated in FIG. 7. The tab 253 extends toward the slot 247 on the outer surface of the tubular seal assembly 240. When the assembly 200 is lowered into the casing 90 that has been fixed with cement formerly within the bore 54, the tab 253 is initially placed in 247a in a slot 247. In this position, the bar 254 is bent within the bore. slot 218. During operation, the template 100 is secured to the lower section or junction of surface or intermediate casing 90 on the surface, by any appropriate means, such as screw threads and surface casing 90. or intermediate is placed within the bore 54 by securing the additional sections or joins of the casing together in a conventional manner, as the string from the casing is lowered into the bore as will be apparent to an expert artisan. The assembly 200 is then lowered into this lower section or union of the surface or intermediate casing 90 by means of an appropriate tool secured to the drill pipe and engages within the beveled profile 243 on the internal surface of the portion. 242 end liked. The assembly 200 is lowered until the key 92 contacts the groove 214 on the outer surface of the cam 211. The inclined surfaces of the groove 214 cause the cam 211 and the tubular seal assembly to rotate until the key 92 adopts position 14a as illustrated in Figure 3. Oriented in this way, the tubular seal assembly 240 will be aligned with the perforation 120 of the template 100. As illustrated in Figure 10, the tab 253 is initially placed at 247a within the slot 247 in the tubular assembly 240 and secures the tubular assembly 240 in a restrained position as illustrated in Figure 11. In this position, the enlarged head portion 216 of the pin 215 is received within the recess 248 on the outer surface of the assembly 240 and the shoulder 241 on the outside of the tubular assembly 240 is received. contacting the broadsword 222 within the bore 200, in order to retain the assembly 240 within the bore 220. The movement of the tongue 253 within the groove 247 is inhibited by the configuration of the groove 247. The application of sufficient force (e.g., 1,757.5 kilograms per square centimeter to the bar 254 through the drill pipe (not shown), the assembly 240, the slot 247 and the tongue 253 is necessary. or to overcome the force exerted on the tongue 253 in the slot 247 by means of the bar 254 which is bent into the slot 218 and allows the bar 254 to move towards the elongated portion of the slot 247. Alternatively, the slot 247a it can be aligned with the elongated portion of the groove and the head 216 of the pin 215 can be provided with springs in order to retain the tongue 253 at the lower end of the groove 247, until a sufficient force is exerted e.g. 1,757.5 kilograms per square centimeter applied to retract the head 216. The assembly 240 is then lowered through the bore 220 and into the bore 120 of the template 100. The seal (s) 245 of the seal assembly 240 couples the inner walls of the first section 121 of the perforation 120, in order to provide a fluid tight seal therebetween. The shoulder 242 of seal assembly 240 abuts against shoulder 221 of bore 220 and seal (s) 223 provides a fluid tight seal. In this lowered position, the tubular seal assembly 240 forces the pin 215 towards the recess 94 in the wall of the casing pipe 90 to further secure the cam 211 in the casing pipe 90. Likewise, a bar 254 must be applied to the bar 254. sufficient force eg, 3,515 kilograms per square centimeter through the drill pipe, the assembly 240, the slot 247 and the tongue 253, to bend the bar 254 into the slot 218, and allow the tongue 253 is positioned at 247b within the slot 247. The force necessary to move the tab 253 to the position 247b also disengages the tool that is secured to the drill pipe from engagement with the profile 243. As illustrated in Figure 7, the annular seal (s) 212 of the assembly 200 couples the inner surface of the lower section or junction of the surface or intermediate coating pipe 90 in order to provide a fluid tight seal between the same. Preferably, the inner surface of the lower section or junction of the surface or intermediate coating pipe 90 is polished to ensure the integrity of the seal formed during coupling by means of the annular seal (S) 212 of the assembly 200. It will be apparent to an expert artisan that the slot 214 as used in this embodiment of the assembly of the present invention, will be configured similarly to the slot 14 that is illustrated in Figure 3 with the exception that the vertical portions of the slot 214 will correspond to the positions 214a and 214c which will be shortened since the tubular seal assembly 240 is slidably secured to the positioning cam 214 and can therefore be lowered in engagement with a perforation of a multi-well template once the cam has been aligned in a way just described. The drill string with the appropriate tool secured therein rises to the surface and the casing 90 is then fixed with cement into the bore 54 by conventional techniques. A conventional drill string including a drill bit and a mud motor (not shown) is lowered into the casing 90 and introduced through the bore 220 by means of the tapered portion 227 of the bore 220, and through the perforation 249 in the seal assembly 240 and into the perforation 120 of the template 100, after which the valve 126 and the cement, if any, are drilled out of the perforation 120. Then, a first sounding is drilled and completed in the manner as described above with respect to Figures 1 to 5. Where appropriate, it is preferred to place the set 200 within the lower section or the surface casing 90 or intermediate the surface such that seal (s) 245 of seal assembly 240 engage the inner walls of the first section 121 of bore 120, in the manner described above. In this embodiment, the cam 211 and the seal assembly 240 are completely assembled in the template 100 on the surface, and the surface or intermediate coating pipe 90 with the template 100 secured therein is positioned within the bore 54, ensuring additional sections or casing joints together in a conventional manner, as the string from the casing is lowered into the borehole. In this way, the need to use a drill pipe is eliminated by having an appropriate tool secured therein at the bottom of the hole of the assembly 200 within the template 100. After the first well is drilled, the drill string drilling that is equipped with an appropriate traction tool fixed near the bottom end of - 2! it is lowered into the casing pipe 90 and is introduced through the bore 230 by means of the tapered portion 227 and through the bore 249 of the seal assembly 240, until the pulling tool is engaged within the bore. annular profile 243 in seal assembly 240. The drill string is then raised until sufficient pressure is exerted on the rod 254 to bend it, thereby allowing the tongue 253 to rotate and move within the slot 247. The assembly 200 is raised until the shoulder 241 stop against the shoulder 222 thereby causing the head 216 of the pin 215 to be retracted into the annular recess 248 that is formed on the outer surface of the tubular seal assembly 240 and thereby allows the cam 211 to be raised as well. The engagement of the key 92 within the slot 214 causes the orientation cam 211 to automatically rotate until the key 92 assumes the position 214b (Figure 3) within the slot 214. Subsequent to the descent of the drill string is caused that the cam rotates until the key 92 is positioned at 214c within the slot 214. In this orientation, the tubular seal assembly 240 will be aligned with the bore 130 a template 100 such that the seal (s) 242 of the seal assembly 240 will engage the inner walls of the first section 131 of the perforation 130, when lowered to provide therewith a fluid tight seal. Once the seal assembly has been lowered completely, the pin 215 will be forced into engagement with the annular recess 94 in the inner surface of the casing pipe 90. Then, the drill string is used to pierce the plug 136 out of position. the perforation 130 of the template 100. The drill string is passed through the perforation 130 and a second drill is drilled and completed in the manner described above with respect to Figures 1 to 5. The drill string then rises to the surface, which causes the traction tool to be engaged with the perfiler 243 in the annular seal assembly. Coupling the key 92 with the slot 214 causes the key 92 to disengage from the slot 214, thereby allowing the drill string and the assembly 200 to rise to the surface. The assembly 200 may be used in conjunction with a multiple well drilling template at the bottom of the well or the subsurface to drill and complete the wells of offshore drilling equipment, subsea wellheads or non-coastal platforms. Although the assembly of the present invention has been illustrated and described as being used in conjunction with a subsurface or bottomhole template having two perforations therethrough, it will be apparent to a skilled artisan that the assembly can be used with a subsurface template or bottom of the well that has three or more holes. When three perforations are provided through the jig, the slot 14 or 214 on the outer surface of the cam 11 of 211 will be rearranged so that it will be apparent to an expert craftsman in order to allow rotation of the cam 11. or 211, in 120 ° increments. When more than three perforations are provided through the jig, the slot 14 or 214 on the outer surface of the cam 11 or 211 will be reconfigured to allow rotation of the cam 11 or 211 in graduated increments as will be evident for a skilled artisan. Even when the preferred embodiments of the invention mentioned above have been described and shown, it will be understood that alternatives and modifications such as those suggested or others can be made therein, which are within the scope of the invention.

Claims (21)

1. CLAIMS: 1. A process for drilling underground wells from a casing extending from an underground depth to the ground surface and to which a subsurface or bottom template having at least two perforations through a hole is secured. the same, the process includes: drilling a first underground sounding through one of the perforations and towards the underground formation; and circulating fluid to the surface during the drilling step through the casing.
2. 2. The process of claim 1, further comprising: drilling a second underground well through another of the holes to an underground formation; and circulating the fluid to the surface during the drilling step through the casing.
3. 3. The process of claim 1, wherein the first coating surface is a surface coating surface.
4. 4. The process of claim 1, wherein the first casing is the intermediate casing.
5. 5. The process of claim 1, wherein the first casing pipe is generally vertical.
6. The process of claim 1, wherein the first casing pipe is biased.
7. The process of claim 1, wherein the fluid is drilling mud and cuttings from the underground formation.
8. The process of claim 1, wherein the first underground sounding is drilled by means of a drill string having a drill bit secured thereto, which is placed through the casing and one of the perforations , the fluid being circulated to the surface during the drilling of the first sounding through an annular conduit defined between the drill string and the casing pipe.
9. 9. A process for drilling underground wells of a casing that extends from an underground depth to the surface of the ground and to which a subsurface or bottom subsurface template having at least two holes through the base is secured. same, the process comprises: placing an orientation cam having a bore through it above the template in such a manner, that the perforation through the orientation cam is aligned with one of at least two perforations at through the template; provide a fluid-tight seal between the orientation cam and the casing; and providing a fluid-tight seal between the orientation cam and one of at least two perforations through the template.
10. The process of claim 9, further comprising: circulating fluid to the surface through the bore in the orientation cam and through the casing pipe during drilling a first underground borehole through one of the perforations and towards an underground formation.
11. The process of claim 9, further comprising: repositioning the orientation cam over the template in such a manner that the perforation through the orientation cam is aligned with another of at least two perforations through Of the template; provide a fluid-tight seal between the orientation cam and one of at least two perforations through the template.
12. 12. The process of claim 11, further comprising: circulating the fluid to the surface through the casing pipe during the drilling of a second underground sounding through the other of the perforations and into the underground formation.
13. The process of claim 9, wherein the step of providing a fluid-tight seal between the orientation cam and one of at least two perforations through the template comprises inserting a portion of a tubular assembly that is secured sealably ay that slides reliably from the cam inside the borehole, the portion of the tubular assembly that is inserted inside a perforation of the template has essentially annular seals around the outside thereof.
14. The process of claim 13, further comprising: releasably holding the tubular assembly in the position wherein the portion of the tubular assembly is inserted within a perforation of the template.
15. The method of claim 9, wherein the step of positioning and orienting the cam over the template such that the perforation through the orientation cam is aligned with one of at least two perforations through the jig comprises contacting the cam with a key that is secured in the casing, the key and the cam cooperate during contact to align the vertical tube with one of at least the two perforations through the jig.
16. The method of claim 11, wherein the step of relocating the orientation cam over the template such that the perforation through the orientation cam is aligned with another of at least two perforations a Through the template, it comprises contacting the cam with a key that is secured in the casing, the key and the cam cooperate during contact, in order to align the vertical tube with one of at least two perforations through Of the template.
17. The method of claim 10, wherein a first underground drill is drilled by passing a drill string including a drill bit from the surface through the casing, drilling through the orientation cam and a perforation through the template.
18. The method of claim 17, wherein the fluid is circulated from the surface through the drill string and again to the surface through the first underground borehole, one of at least two bore holes through the borehole. template, the perforation through the orientation cam and the annular conduit is defined between the drill string and the casing.
19. The method of claim 12, wherein the second underground well is drilled by passing a string of pipe including a drill bit from the surface through the casing, drilling through the orientation cam and another piercing through the template.
20. The method of claim 19, wherein the fluid is circulated from the surface through the drill string and again to the surface through the second underground sounding, the other of at least two holes through the the template and the perforation through the orientation cam and an annular conduit defined between the drill string and the casing.
21. 21. All the inventions described herein.