CA3146320A1 - Magnetic ranging to an axially magnetized magnetic source - Google Patents
Magnetic ranging to an axially magnetized magnetic sourceInfo
- Publication number
- CA3146320A1 CA3146320A1 CA3146320A CA3146320A CA3146320A1 CA 3146320 A1 CA3146320 A1 CA 3146320A1 CA 3146320 A CA3146320 A CA 3146320A CA 3146320 A CA3146320 A CA 3146320A CA 3146320 A1 CA3146320 A1 CA 3146320A1
- Authority
- CA
- Canada
- Prior art keywords
- borehole
- ranging
- magnetic
- drilling assembly
- magnetic source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 81
- 238000005553 drilling Methods 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 238000002955 isolation Methods 0.000 claims abstract description 4
- 238000013481 data capture Methods 0.000 claims 1
- 230000008569 process Effects 0.000 description 6
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010796 Steam-assisted gravity drainage Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000001994 activation Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/09—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
Abstract
A system and method of magnetic ranging that obviates the need for wireline conveyance in magnetic ranging applications for borehole to borehole proximity measurement. An axially magnetized magnetic source contained in a nonmagnetic collar is added to a borehole drilling assembly and conveyed downhole under standard operating conditions. A second borehole drilling assembly is equipped with an MWD ranging sensor, positioned with sufficient nonmagnetic isolation to ensure the MWD ranging sensor is not being perturbed by the drillstring. Except for during the actual surveying condition, drilling operations can proceed as normal minimizing interruption, equipment and operator safety risks and maximizing throughput and performance at the drill site.
Description
F
MAGNETIC RANGING TO AN AXIALLY MAGNETIZED MAGNETIC SOURCE
Martin L __________________________________________________________________________ This invention is in the field of magnetic ranging in drilling applications, and more specifically is in the field of the use of axially magnetized permanent magnets installed in a drilling assembly.
Background:
In subterranean drilling, understanding the proximity between boreholes is often required to satisfy anticollision or borehole placement objectives. Magnetic field ranging is most often used to yield such measurements for safety or productivity purposes in varying proximate borehole applications - available magnetic field ranging equipment exhibits significant use complexity and difficulty which could be substantially improved, both in terms of simplification and ease and speed of use as well as accuracy in such accelerated operations and it is Date Recue/Date Received 2022-01-20 desired to develop alternate methodology of this nature for use in this area.
Most commercially available magnetic ranging systems are designed to operate in a magnetically perturbed environment at relatively short distances, and/or they require a wireline to convey ranging equipment into, along and out of boreholes.
Often in geothermal, petroleum, potash and other related projects, multiple boreholes can be required at depths and lengths of several thousand metres. In many of these deep or long length drilling projects, the project plan might call for periodic or continuous ranging runs with the wireline to measure and verify that the relative proximity between the boreholes in question is as desired. This is predominantly accomplished by the whole thing all drilling operations, rigging the wireline and ranging equipment at the surface, and lowering an electromagnet or ranging sensor into one of the boreholes so the ranging measurement can be made. Once the ranging data is collected and the proximity is determined between the boreholes or in other similar applications, the ranging equipment is tripped back Date Recue/Date Received 2022-01-20 to the surface and the wireline and ranging surface equipment are rigged out before normal drilling operations can recommence. This process as can be seen is cumbersome, resulting in regular drilling shutdowns, substantial wasted time in the rigging and re-rigging of the ranging and drilling tools, as well as exposing the ranging equipment to the higher possibility of damage as well as the higher possibility of operator injury, with the additional raising and lowering operations.
Prior art systems include vector magnetics systems used on the overwhelming majority of global SAGD wells, as well as for SAGD drilling, obstacle anticollision avoidance, borehole intersection measurements etc. These prior art systems are accurate and operate in magnetically perturbed environments, making use of a directional MWD ("measurement while drilling") sensor/tool to measure magnetic field -these do not require much training to operate. The key components these prior art systems are an electromagnet deployed via wireline into one of the boreholes, along with access to the MWD directional drilling system and associated measurement and computer tools at surface.
Date Recue/Date Received 2022-01-20 Because these systems are designed to operate in magnetically corrupt environments, they require a method to identify the "unwanted" magnetic fields from nearby casing, drillstring, the Earth's magnetic field etc., so that the magnetic field from the ranging electromagnet can be identified and used to calculate the proximity between the MWD sensor and the magnetic ranging source. Isolating or identifying the magnetic field of only the electromagnet desired to be measured is accomplished by exciting the electromagnet of positive polarity and measuring the field using the MWD sensor, and then a negative polarity and again measuring the field. With some simple math these two values can be used to identify the magnetic field generated by the electromagnet, and converting same to distance measurement estimations etc. as required.
The ranging systems that are currently commercially available and used to produce accurate proximity data in both magnetically clean and magnetically perturbed environments have a relatively short detection range. Many require the ranging equipment to be conveyed into one of the boreholes to perform the ranging measurement.
If it were possible to come up with approaches that simplified this process and limited the downtime and Date Recue/Date Received 2022-01-20 equipment and personal risks in these operations is believed that this would be positively commercially received.
Ranging systems that operate at total distances more than m often use an electromagnet powered from the surface to generate the magnetic dipole. Polarity of the electromagnet can be changed by the operator at the surface.
In other cases, alternating magnetic field can be generated in one borehole and measured in the adjacent borehole, using a sensor, which offers many advantages in terms of signal processing. The alternating magnetic field approach, using the presence of a sensor in the adjacent borehole, results in accurate ranging measurements being possible in magnetically perturbed environments, as well as at far larger distances, but would again require a wireline to convey the ranging sensor into the borehole from which the proximity measurement would be calculated. If it were possible to practice similar MWD magnetic field ranging and methodology without the necessity for equipment shutdown or a wireline down one of the two bores in question, it is Date Recue/Date Received 2022-01-20 believed that this would represent a substantial commercial improvement in the art.
Overview of the Invention:
The invention comprises an enhanced method and apparatus for the determination of proximity between boreholes using magnetic ranging technology without the need for the use of wirelines or wireline run-in and retraction steps or to otherwise cease drilling operations for periodic measurement.
By developing a system of magnetic ranging proximity measurement between proximate boreholes which allow for constant ongoing ranging and measurement, accuracy and speed of drilling and similar operations can be maximized.
The invention in certain embodiments provides an alternate method and apparatus for the capture and determination of accurate proximity data between two or more boreholes, without the need for wireline services to deploy ranging equipment under certain conditions.
Date Recue/Date Received 2022-01-20 In certain embodiments of the system and method of the present invention, an axially magnetized magnetic source contained in a nonmagnetic collar is added to one of the borehole drilling assemblies, and conveyed downhole under standard operating conditions. The axially magnetized magnetic source, by design, has a magnetic field sufficient to be sampled when an MWD ranging sensor is within a designed proximity or radial distance, so care needs to be taken to ensure that the MWD ranging sensor is not corrupted by the axially magnetized magnetic source while performing a standard directional drilling survey.
A second borehole drilling assembly is equipped with an MWD
ranging sensor, positioned with sufficient nonmagnetic isolation to ensure the MWD ranging sensor is not being perturbed by the drillstring. Alternatively a MWD ranging sensor dedicated to ranging operations can be positioned behind a primary MWD system and other bottom hole assembly components, designed with adequate nonmagnetic spacing to again eliminate drillstring interference.
By equipping borehole drilling assemblies in the adjacent boreholes to be monitored or between which proximity is to be determined with these types of tools, namely an axially Date Recue/Date Received 2022-01-20 magnetized magnetic source in a nonmagnetic collar, and an MWD ranging sensor position with sufficient nonmagnetic isolation to avoid drillstring interference When it is time to execute a ranging operation between the tool equipped bores, the MWD ranging sensor will be positioned at the ranging survey station and remained there throughout the ranging process. Except for during the actual surveying condition, drilling operations can proceed as normal minimizing interruption, equipment and operator safety risks and maximizing throughput and performance at the drill site.
Assuming the magnetic properties of components making up the drilling assemblies, casing or other borehole architecture are understood, the boreholes and the drilling assembly can be designed with adequate separation to eliminate cross axial and drillstring magnetic interference when there has been no active magnetic ranging source introduced. Care also needs to be taken during surveying operations to ensure that the axially magnetized magnetic source does not perturb the MWD ranging sensor during the MWD surveying process. This is accomplished with drilling assembly design as well as potentially by controlling the relative position of the boreholes with drilling depth.
Date Recue/Date Received 2022-01-20 Depending on the calculated radial distance between boreholes, and considering any possible positional errors, the magnetic source can be moved away from the ranging sensor by changing the measured depth of the magnetic source to measure the Earth's magnetic field, or positioned closer to measure the combined magnetic fields of the earth and the magnetic source. This process can be reversed at the proximity between the magnetic source of the ranging sensor at the beginning of the ranging operation was such that collecting the magnetic data in reverse is more efficient.
The measured values of the earth magnetic field in the combined magnetic field of the earth and the magnetic source can be used to calculate the magnetic field of the magnetic source at the MWD ranging sensor. The calculated magnetic field is then use to define the relative proximity of the MWD ranging sensor, in its related borehole, to the magnetic source in its related borehole.
While the invention proposed would not be optimal for use in magnetically perturbed environments where multiple boreholes are drilled in close proximity to one another, it Date Recue/Date Received 2022-01-20 is fit for purpose and will provide a very cost-effective ranging method for measuring the proximity of boreholes at distances which are sufficiently separated to prevent cross axial interference in such an environment. By deploying the ranging equipment and nonmagnetic drilling collars, the system and method of the present invention obviates the need for a wireline service, or for any of its related equipment, to make a downhole ranging measurement.
There are a number of types of axially magnetized permanent magnetic sources which could be installed in a drilling assembly and could be deployed in a variety of configurations. For example, the axially magnetized magnetic source could be installed down the long axis of the borehole and contained within a drilling assembly, borehole casing or any other borehole infrastructure to generate a magnetic dipole. Alternatively, the actually magnetized permanent magnets could be housed in a magnetic or nonmagnetic material and could be permanently mounted on or built into borehole architecture like casing or casing centralizers and left downhole. In further embodiments, the axially magnetized magnetic source could be temporarily mounted to borehole architecture like casing and later retrieved. In some embodiments, the axially magnetized Date Recue/Date Received 2022-01-20 magnetic source could be temporarily mounted in a drilling component or components and deployed in retrieved as part of the normal drilling operation.
Certain embodiments of the axially magnetized magnetic source could be designed with a bore extending therethrough to allow fluid and equipment to pass through its inside diameter, or in other cases the magnetic source could be designed as a sonde that allows fluid to pass over its outside diameter.
The magnetic source could also be a permanent magnet or multiple permanent actually magnetized permanent magnets magnetically coupled together or mechanically spaced apart.
The magnetic source could also comprise a magnetized drilling component itself, or magnetized other borehole component.
In alternate or further embodiments, the axially magnetized magnetic source could comprise an electromagnet powered by a downhole power source.
It is specifically contemplated that the MWD ranging sensor which could be used in accordance with the remainder of the Date Recue/Date Received 2022-01-20 method of the present invention would be a standard MWD
tool, capable of measuring the magnetic field. The primary distinction between the system and method of the present invention and wireline embodiments of the prior art is that instead of deploying electromagnet on a wireline, the system and method of the present invention ranges to an axially magnetized permanent magnet which is built into a nonmagnetic drill collar included in the drill assembly in a borehole. Obligation of the need for a wireline service by altering a downhole tool to include the magnetic source and to carry it in the borehole during drilling operations between activations for ranging purposes represents in its broadest context the intended scope of the method and apparatus of the present invention.
In the actual ranging methodology of the present invention two surveys are used. A first survey will measure only the magnetic field of the earth, and a second survey measures the magnetic field of the earth and the axially magnetized permanent magnet built into the nonmagnetic drill collar.
The steps of the ranging method itself are as follows:
1) Evaluate the radial distance between the magnetic source/ranging collar and the MWD ranging sensor;
Date Recue/Date Received 2022-01-20
MAGNETIC RANGING TO AN AXIALLY MAGNETIZED MAGNETIC SOURCE
Martin L __________________________________________________________________________ This invention is in the field of magnetic ranging in drilling applications, and more specifically is in the field of the use of axially magnetized permanent magnets installed in a drilling assembly.
Background:
In subterranean drilling, understanding the proximity between boreholes is often required to satisfy anticollision or borehole placement objectives. Magnetic field ranging is most often used to yield such measurements for safety or productivity purposes in varying proximate borehole applications - available magnetic field ranging equipment exhibits significant use complexity and difficulty which could be substantially improved, both in terms of simplification and ease and speed of use as well as accuracy in such accelerated operations and it is Date Recue/Date Received 2022-01-20 desired to develop alternate methodology of this nature for use in this area.
Most commercially available magnetic ranging systems are designed to operate in a magnetically perturbed environment at relatively short distances, and/or they require a wireline to convey ranging equipment into, along and out of boreholes.
Often in geothermal, petroleum, potash and other related projects, multiple boreholes can be required at depths and lengths of several thousand metres. In many of these deep or long length drilling projects, the project plan might call for periodic or continuous ranging runs with the wireline to measure and verify that the relative proximity between the boreholes in question is as desired. This is predominantly accomplished by the whole thing all drilling operations, rigging the wireline and ranging equipment at the surface, and lowering an electromagnet or ranging sensor into one of the boreholes so the ranging measurement can be made. Once the ranging data is collected and the proximity is determined between the boreholes or in other similar applications, the ranging equipment is tripped back Date Recue/Date Received 2022-01-20 to the surface and the wireline and ranging surface equipment are rigged out before normal drilling operations can recommence. This process as can be seen is cumbersome, resulting in regular drilling shutdowns, substantial wasted time in the rigging and re-rigging of the ranging and drilling tools, as well as exposing the ranging equipment to the higher possibility of damage as well as the higher possibility of operator injury, with the additional raising and lowering operations.
Prior art systems include vector magnetics systems used on the overwhelming majority of global SAGD wells, as well as for SAGD drilling, obstacle anticollision avoidance, borehole intersection measurements etc. These prior art systems are accurate and operate in magnetically perturbed environments, making use of a directional MWD ("measurement while drilling") sensor/tool to measure magnetic field -these do not require much training to operate. The key components these prior art systems are an electromagnet deployed via wireline into one of the boreholes, along with access to the MWD directional drilling system and associated measurement and computer tools at surface.
Date Recue/Date Received 2022-01-20 Because these systems are designed to operate in magnetically corrupt environments, they require a method to identify the "unwanted" magnetic fields from nearby casing, drillstring, the Earth's magnetic field etc., so that the magnetic field from the ranging electromagnet can be identified and used to calculate the proximity between the MWD sensor and the magnetic ranging source. Isolating or identifying the magnetic field of only the electromagnet desired to be measured is accomplished by exciting the electromagnet of positive polarity and measuring the field using the MWD sensor, and then a negative polarity and again measuring the field. With some simple math these two values can be used to identify the magnetic field generated by the electromagnet, and converting same to distance measurement estimations etc. as required.
The ranging systems that are currently commercially available and used to produce accurate proximity data in both magnetically clean and magnetically perturbed environments have a relatively short detection range. Many require the ranging equipment to be conveyed into one of the boreholes to perform the ranging measurement.
If it were possible to come up with approaches that simplified this process and limited the downtime and Date Recue/Date Received 2022-01-20 equipment and personal risks in these operations is believed that this would be positively commercially received.
Ranging systems that operate at total distances more than m often use an electromagnet powered from the surface to generate the magnetic dipole. Polarity of the electromagnet can be changed by the operator at the surface.
In other cases, alternating magnetic field can be generated in one borehole and measured in the adjacent borehole, using a sensor, which offers many advantages in terms of signal processing. The alternating magnetic field approach, using the presence of a sensor in the adjacent borehole, results in accurate ranging measurements being possible in magnetically perturbed environments, as well as at far larger distances, but would again require a wireline to convey the ranging sensor into the borehole from which the proximity measurement would be calculated. If it were possible to practice similar MWD magnetic field ranging and methodology without the necessity for equipment shutdown or a wireline down one of the two bores in question, it is Date Recue/Date Received 2022-01-20 believed that this would represent a substantial commercial improvement in the art.
Overview of the Invention:
The invention comprises an enhanced method and apparatus for the determination of proximity between boreholes using magnetic ranging technology without the need for the use of wirelines or wireline run-in and retraction steps or to otherwise cease drilling operations for periodic measurement.
By developing a system of magnetic ranging proximity measurement between proximate boreholes which allow for constant ongoing ranging and measurement, accuracy and speed of drilling and similar operations can be maximized.
The invention in certain embodiments provides an alternate method and apparatus for the capture and determination of accurate proximity data between two or more boreholes, without the need for wireline services to deploy ranging equipment under certain conditions.
Date Recue/Date Received 2022-01-20 In certain embodiments of the system and method of the present invention, an axially magnetized magnetic source contained in a nonmagnetic collar is added to one of the borehole drilling assemblies, and conveyed downhole under standard operating conditions. The axially magnetized magnetic source, by design, has a magnetic field sufficient to be sampled when an MWD ranging sensor is within a designed proximity or radial distance, so care needs to be taken to ensure that the MWD ranging sensor is not corrupted by the axially magnetized magnetic source while performing a standard directional drilling survey.
A second borehole drilling assembly is equipped with an MWD
ranging sensor, positioned with sufficient nonmagnetic isolation to ensure the MWD ranging sensor is not being perturbed by the drillstring. Alternatively a MWD ranging sensor dedicated to ranging operations can be positioned behind a primary MWD system and other bottom hole assembly components, designed with adequate nonmagnetic spacing to again eliminate drillstring interference.
By equipping borehole drilling assemblies in the adjacent boreholes to be monitored or between which proximity is to be determined with these types of tools, namely an axially Date Recue/Date Received 2022-01-20 magnetized magnetic source in a nonmagnetic collar, and an MWD ranging sensor position with sufficient nonmagnetic isolation to avoid drillstring interference When it is time to execute a ranging operation between the tool equipped bores, the MWD ranging sensor will be positioned at the ranging survey station and remained there throughout the ranging process. Except for during the actual surveying condition, drilling operations can proceed as normal minimizing interruption, equipment and operator safety risks and maximizing throughput and performance at the drill site.
Assuming the magnetic properties of components making up the drilling assemblies, casing or other borehole architecture are understood, the boreholes and the drilling assembly can be designed with adequate separation to eliminate cross axial and drillstring magnetic interference when there has been no active magnetic ranging source introduced. Care also needs to be taken during surveying operations to ensure that the axially magnetized magnetic source does not perturb the MWD ranging sensor during the MWD surveying process. This is accomplished with drilling assembly design as well as potentially by controlling the relative position of the boreholes with drilling depth.
Date Recue/Date Received 2022-01-20 Depending on the calculated radial distance between boreholes, and considering any possible positional errors, the magnetic source can be moved away from the ranging sensor by changing the measured depth of the magnetic source to measure the Earth's magnetic field, or positioned closer to measure the combined magnetic fields of the earth and the magnetic source. This process can be reversed at the proximity between the magnetic source of the ranging sensor at the beginning of the ranging operation was such that collecting the magnetic data in reverse is more efficient.
The measured values of the earth magnetic field in the combined magnetic field of the earth and the magnetic source can be used to calculate the magnetic field of the magnetic source at the MWD ranging sensor. The calculated magnetic field is then use to define the relative proximity of the MWD ranging sensor, in its related borehole, to the magnetic source in its related borehole.
While the invention proposed would not be optimal for use in magnetically perturbed environments where multiple boreholes are drilled in close proximity to one another, it Date Recue/Date Received 2022-01-20 is fit for purpose and will provide a very cost-effective ranging method for measuring the proximity of boreholes at distances which are sufficiently separated to prevent cross axial interference in such an environment. By deploying the ranging equipment and nonmagnetic drilling collars, the system and method of the present invention obviates the need for a wireline service, or for any of its related equipment, to make a downhole ranging measurement.
There are a number of types of axially magnetized permanent magnetic sources which could be installed in a drilling assembly and could be deployed in a variety of configurations. For example, the axially magnetized magnetic source could be installed down the long axis of the borehole and contained within a drilling assembly, borehole casing or any other borehole infrastructure to generate a magnetic dipole. Alternatively, the actually magnetized permanent magnets could be housed in a magnetic or nonmagnetic material and could be permanently mounted on or built into borehole architecture like casing or casing centralizers and left downhole. In further embodiments, the axially magnetized magnetic source could be temporarily mounted to borehole architecture like casing and later retrieved. In some embodiments, the axially magnetized Date Recue/Date Received 2022-01-20 magnetic source could be temporarily mounted in a drilling component or components and deployed in retrieved as part of the normal drilling operation.
Certain embodiments of the axially magnetized magnetic source could be designed with a bore extending therethrough to allow fluid and equipment to pass through its inside diameter, or in other cases the magnetic source could be designed as a sonde that allows fluid to pass over its outside diameter.
The magnetic source could also be a permanent magnet or multiple permanent actually magnetized permanent magnets magnetically coupled together or mechanically spaced apart.
The magnetic source could also comprise a magnetized drilling component itself, or magnetized other borehole component.
In alternate or further embodiments, the axially magnetized magnetic source could comprise an electromagnet powered by a downhole power source.
It is specifically contemplated that the MWD ranging sensor which could be used in accordance with the remainder of the Date Recue/Date Received 2022-01-20 method of the present invention would be a standard MWD
tool, capable of measuring the magnetic field. The primary distinction between the system and method of the present invention and wireline embodiments of the prior art is that instead of deploying electromagnet on a wireline, the system and method of the present invention ranges to an axially magnetized permanent magnet which is built into a nonmagnetic drill collar included in the drill assembly in a borehole. Obligation of the need for a wireline service by altering a downhole tool to include the magnetic source and to carry it in the borehole during drilling operations between activations for ranging purposes represents in its broadest context the intended scope of the method and apparatus of the present invention.
In the actual ranging methodology of the present invention two surveys are used. A first survey will measure only the magnetic field of the earth, and a second survey measures the magnetic field of the earth and the axially magnetized permanent magnet built into the nonmagnetic drill collar.
The steps of the ranging method itself are as follows:
1) Evaluate the radial distance between the magnetic source/ranging collar and the MWD ranging sensor;
Date Recue/Date Received 2022-01-20
2) If the proximity of the MWD ranging sensor and MAG
collar is larger than the magnetic boundary of the ranging collar then the earth's field is recorded.
If the MWD sensor is located somewhere within the magnetic collar boundary than a combined mag collar/earth field measurement is recorded.
collar is larger than the magnetic boundary of the ranging collar then the earth's field is recorded.
If the MWD sensor is located somewhere within the magnetic collar boundary than a combined mag collar/earth field measurement is recorded.
3) In the third step opposite information of the above ranging and capture step is captured - it requires the MAG collar to be repositioned in the borehole by tripping it roughly 100m away or closer to the MWD
sensor. A second MWD survey measures the magnetic field at which point drilling continues.
sensor. A second MWD survey measures the magnetic field at which point drilling continues.
4) The magnetic data takes 1-3 minutes to process, and the resulting proximity data can be used to further evaluate the relative position of the boreholes.
5) Total time required would be about 10 minutes plus 100m trip time.
The system has been modeled at distances of up to 120m and tested at a variety of distances below 20 meters with accurate and repeatable results.
Date Recue/Date Received 2022-01-20 It will be apparent to those of skill in the art that by routine modification the present invention can be optimized for use in a wide range of conditions and application. It will also be obvious to those of skill in the art that there are various ways and designs with which to produce the apparatus and methods of the present invention. The illustrated embodiments are therefore not intended to limit the scope of the invention, but to provide examples of the apparatus and method to enable those of skill in the art to appreciate the inventive concept.
Those skilled in the art will recognize that many more modifications besides those already described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the scope of the appended claims.
Moreover, in interpreting both the specification and the claims, all terms should be interpreted in the broadest possible manner consistent with the context. The terms "comprises" and "comprising" should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or Date Recue/Date Received 2022-01-20 combined with other elements, components, or steps not expressly referenced.
Date Recue/Date Received 2022-01-20
The system has been modeled at distances of up to 120m and tested at a variety of distances below 20 meters with accurate and repeatable results.
Date Recue/Date Received 2022-01-20 It will be apparent to those of skill in the art that by routine modification the present invention can be optimized for use in a wide range of conditions and application. It will also be obvious to those of skill in the art that there are various ways and designs with which to produce the apparatus and methods of the present invention. The illustrated embodiments are therefore not intended to limit the scope of the invention, but to provide examples of the apparatus and method to enable those of skill in the art to appreciate the inventive concept.
Those skilled in the art will recognize that many more modifications besides those already described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the scope of the appended claims.
Moreover, in interpreting both the specification and the claims, all terms should be interpreted in the broadest possible manner consistent with the context. The terms "comprises" and "comprising" should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or Date Recue/Date Received 2022-01-20 combined with other elements, components, or steps not expressly referenced.
Date Recue/Date Received 2022-01-20
Claims (5)
1.An axially magnetized magnetic source for use in a non-wireline borehole proximity ranging method, set magnetic source comprising an axially oriented magnetic source contained in a nonmagnetic collar in accordance with any embodiment outlined herein, the magnetic source having a magnetic field sufficient to be sampled when an MWD
ranging sensor is within a designed proximity or radial distance.
ranging sensor is within a designed proximity or radial distance.
2.A magnetic source borehole drilling assembly for use in a nonwireline borehole proximity ranging method, said borehole drilling assembly comprising a standard borehole drilling assembly with the addition of an axially magnetized magnetic source contained in a nonmagnetic collar in accordance with any embodiment of the present invention, the magnetic source having a magnetic field sufficient to be sampled when an MWD ranging sensor is within a designed proximity or radial distance and the magnetic source is positioned at a survey position within the borehole.
3.A ranging sensor equipped borehole drilling assembly for attachment to a drillstring and for use in a nonwireline borehole proximity ranging method, said borehole drilling assembly comprising a standard borehole drilling assembly with the addition of an MWD ranging sensor positioned with sufficient nonmagnetic isolation thereon to ensure the MWD ranging sensor is not perturbed by the drillstring in accordance with any embodiment outlined herein, said MWD ranging sensor capable of connection to a data capture instrumentation at surface above a borehole.
4.A computer system for use in a nonwireline borehole proximity ranging method, said system capable of surface capture of magnetic field measurement and ranging information from a ranging sensor equipped borehole drilling assembly in accordance with Claim 3 and at least one magnetic source borehole drilling assembly in accordance with Claim 2, said computer system capable of calculating the proximity of the at least one magnetic source borehole drilling assembly positioned within a borehole, and the ranging sensor equipped borehole drilling assembly positioned within a second borehole, in accordance with any embodiment of the present invention
5.A method of calculation of the proximity or positioning of adjacent drilled boreholes in accordance with any embodiment enabled herein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA3146320A CA3146320A1 (en) | 2022-01-20 | 2022-01-20 | Magnetic ranging to an axially magnetized magnetic source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA3146320A CA3146320A1 (en) | 2022-01-20 | 2022-01-20 | Magnetic ranging to an axially magnetized magnetic source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA3146320A1 true CA3146320A1 (en) | 2023-07-20 |
Family
ID=87245294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3146320A Withdrawn CA3146320A1 (en) | 2022-01-20 | 2022-01-20 | Magnetic ranging to an axially magnetized magnetic source |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA3146320A1 (en) |
-
2022
- 2022-01-20 CA CA3146320A patent/CA3146320A1/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AZWI | Withdrawn application |
Effective date: 20240311 |