CN115234219B - Nuclear magnetic resonance probe and downhole operation tool - Google Patents
Nuclear magnetic resonance probe and downhole operation tool Download PDFInfo
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- CN115234219B CN115234219B CN202210979144.0A CN202210979144A CN115234219B CN 115234219 B CN115234219 B CN 115234219B CN 202210979144 A CN202210979144 A CN 202210979144A CN 115234219 B CN115234219 B CN 115234219B
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- 239000000523 sample Substances 0.000 title claims abstract description 164
- 238000005481 NMR spectroscopy Methods 0.000 title claims abstract description 84
- 238000013461 design Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 15
- 239000003208 petroleum Substances 0.000 description 6
- 238000005553 drilling Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002002 slurry Substances 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000013421 nuclear magnetic resonance imaging Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- Life Sciences & Earth Sciences (AREA)
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The invention relates to a nuclear magnetic resonance probe and a downhole operation tool. The utility model provides a nuclear magnetic resonance probe, this nuclear magnetic resonance probe has first carrier plate and second carrier plate, be equipped with the first coil that has two first return circuits and the second coil that has two second return circuits on first carrier plate and the second carrier plate respectively, two first return circuit junctions form first return line, two second return circuit junctions form the second return line, first return line is nonparallel with the second return line, through above-mentioned design, make nuclear magnetic resonance probe more intensive to the acquisition of signal, and first coil and second coil pass through first carrier plate and the relative independent setting of second carrier plate, be difficult for forming the interference each other, the signal receives the interference degree low, the signal that obtains is difficult for doping noise, signal definition is higher, the signal to noise ratio of nuclear magnetic resonance probe has been improved.
Description
Technical Field
The invention belongs to the technical field of petroleum drilling, and particularly relates to a nuclear magnetic resonance probe and an underground operation tool.
Background
Nuclear magnetic resonance (Nuclear Magnetic Resonance) has been widely used in the fields of natural scientific research such as physics, chemistry, biology and the like, medical diagnosis, oil and gas exploration and development and the like since the discovery of the middle of the twentieth century, in the technical field of petroleum drilling, in order to obtain various petroleum geology and engineering technical data, logging is often carried out for many times in each stage of drilling, and the nuclear magnetic resonance logging technology is used in petroleum logging to provide unique information, so that the nuclear magnetic resonance logging has the advantages of accurate measurement parameters, no influence of stratum properties, more acquired downhole parameters and the like, and therefore, the nuclear magnetic resonance logging gradually becomes a focus of global logging in recent years.
The signal-to-noise ratio refers to the ratio of signal to noise, and the greater the ratio, the more signal components in the tissue and the higher the sharpness of the image. In the prior art, the signal-to-noise ratio of nuclear magnetic resonance is insufficient in strength, the technical problems of excessive noise, insufficient imaging and the like exist, and the logging operation is influenced.
Disclosure of Invention
In order to solve all or part of the problems described above, an object of the present invention is to provide a nuclear magnetic resonance probe and a downhole tool.
According to an aspect of an embodiment of the present invention, there is provided a nuclear magnetic resonance probe, including a probe body, a first carrier plate covering an outer wall of the probe body along a circumferential direction of the probe body, and a second carrier plate covering the outer wall of the first carrier plate along the circumferential direction of the probe body; the first coil is provided with two first loops, a first return line is formed at the junction of the two first loops, the second coil is provided with two second loops, a second return line is formed at the junction of the two second loops, and the first return line and the second return line are not parallel.
Through setting up first coil on first support plate, set up the second coil on the second support plate, make the first return wire of first coil and second return wire be non-parallel each other, make the magnetic field of first coil and second coil produce alternately, increased signal receiving area, can not enlarge the noise when signal reception is more abundant, improved nuclear magnetic resonance's signal to noise ratio.
According to an aspect of the embodiment of the present invention, the length of the first carrier plate in the circumferential direction of the probe body is not more than one half of the circumference of the bottom surface of the probe body.
When logging, one side of the probe body is attached to the well wall, the other side of the probe body is an underground pipeline, if nuclear magnetic resonance signals are sent out on one side of the probe body attached to the well wall, the nuclear magnetic resonance signals can directly penetrate stratum rock to obtain geological conditions, if the nuclear magnetic resonance signals are sent out on one side of the underground pipeline, impurities such as water flow and slurry in the underground pipeline can seriously interfere with signal obtaining efficiency, information imaging obtained by signals in the correct direction can be influenced, the length of the first carrier plate along the circumferential direction of the probe body is not more than one half of the circumference of the bottom surface of the probe body, the signal direction of the first coil on the first carrier plate is mainly concentrated on one side of the probe body, unnecessary signals are not easy to disperse on other parts of the probe body, directivity of data collected by nuclear magnetic resonance is more accurate, noise is not easy to increase due to the unnecessary signals, and the signal to noise ratio of nuclear magnetic resonance is improved.
According to an aspect of the embodiment of the present invention, a length of the second carrier plate in the axial direction of the probe body is smaller than a length of the probe body in the axial direction.
The end effect is generated for various reasons, and the generated end effect can influence the magnetic field of the nuclear magnetic resonance probe, so that the accuracy of nuclear magnetic resonance imaging is reduced, meanwhile, the resistance of the coil is increased, the additional loss of the motor is caused, and the motor efficiency is reduced. In order to avoid the end effect, the length of the second carrier plate along the axial direction of the probe body is smaller than that of the probe body, so that the length of the second coil arranged on the second carrier plate along the axial direction of the probe body is indirectly shorter than that of the probe body, the second coil is kept at a certain distance from the two ends of the probe body, the end effect of a static magnetic field is effectively avoided, and the stability and the accuracy of nuclear magnetic resonance signals are ensured.
According to one aspect of the embodiment of the invention, the wires at the two ends of the first coil along the axial direction of the probe body are formed with mutually parallel crosspieces, and the distance between the crosspieces and the nearest end of the probe body is smaller than the distance between the crosspieces and the center of the probe body along the axial direction; the length of the first carrier plate along the axial direction of the probe body is smaller than that of the probe body.
The distance between the crosspiece and the nearest end of the probe body is smaller than the distance between the crosspiece and the center of the length of the probe, so that the two crosspieces can be respectively close to the two ends of the probe body, the effective range of signals generated by the first coil along the up-down direction is enlarged, and the range of nuclear magnetic resonance signals is improved.
According to an aspect of an embodiment of the invention, the first return line at least partially overlaps the second return line.
The first return line is at least partially overlapped with the second return line, so that signals of the first coil and signals of the second coil are overlapped, a sensitive region of nuclear magnetic resonance is formed, and when the nuclear magnetic resonance logging device is in actual use, the nuclear magnetic resonance logging can be accurately conducted towards the appointed region by adjusting the corresponding azimuth of the overlapped part of the first return line and the second return line.
According to one aspect of an embodiment of the invention, the first return line at least partially overlaps a midpoint of the second return line, and the second return line at least partially overlaps a midpoint of the first return line.
The first return line is at least partially overlapped with the midpoint of the second return line, and the second return line is at least partially overlapped with the midpoint of the first return line, so that the signal overlapping part of the first coil and the second coil is more accurate, and the transmitting direction of nuclear magnetic resonance signals can be more accurately adjusted during actual use, thereby achieving better nuclear magnetic resonance logging effect.
According to one aspect of the embodiment of the invention, the two first loops are respectively formed with a first surrounding space and a second surrounding space, and the shapes of the first surrounding space and the second surrounding space are adapted to the shape of the first carrier plate; the two second loops are respectively provided with a third surrounding space and a fourth surrounding space, and the shapes of the third surrounding space and the fourth surrounding space are adapted to the shape of the second carrier plate; the first carrier plate and the second carrier plate are rectangular.
Through making first enclosure space, second enclosure space, third enclosure space and fourth enclosure space form the shape that suits with rectangular first support plate and second support plate, make first coil and second coil can form rectangular topological structure to through setting up first enclosure space, second enclosure space, third enclosure space and fourth enclosure space, make the sky of first coil and second coil have no wire part, improved the heat dispersion when making the energy more dispersed, the heat loss when having reduced the operation.
According to one aspect of the embodiment of the invention, the first coil and the second coil form a first radio frequency field, the probe body forms a second radio frequency field, the first radio frequency field and the second radio frequency field have an overlapping portion, and the overlapping portion is located at one side of the probe body close to the first return line.
The first coil and the second coil form the first radio frequency field, so that the second radio frequency field and the first radio frequency field generated by the probe body form an overlapped part positioned on one side of the probe body close to the first return line, signals are more dense, and the definition and the signal-to-noise ratio of information acquired by the nuclear magnetic resonance probe are improved.
According to one aspect of an embodiment of the invention, the first radio frequency field and the second radio frequency field are orthogonal to each other.
The first radio frequency field and the second radio frequency field are orthogonal to each other, so that the overlap part formed by the first radio frequency field and the second radio frequency field can more comprehensively receive nuclear magnetic resonance signals, all signals can be acquired, the utilization of signal resources is more sufficient, the first radio frequency field and the second radio frequency field are orthogonal to each other and are not related to noise, the increase of the signals is more obvious, and therefore the signal to noise ratio is improved.
According to another aspect of an embodiment of the present invention, there is also provided a downhole tool comprising a nuclear magnetic resonance probe as described above.
When the nuclear magnetic resonance probe provided by the embodiment of the application is applied to a downhole operation tool, the first coil and the second coil are relatively independent and are not easy to interfere with each other by arranging the first carrier plate and the second carrier plate and arranging the first coil and the second coil on the first carrier plate and the second carrier plate, so that the signal stability and the definition of nuclear magnetic resonance of the downhole operation tool are improved. The first coil is provided with two first loops, and the second coil is provided with two second loops, so that the number of turns of the coil in a limited range can be increased, and the signal intensity of nuclear magnetic resonance is improved. The first return line formed by the intersection of the two first loops and the second return line formed by the intersection of the two second loops are not parallel to each other, so that the magnetic fields of the coils are crossed, the receiving signals are more dense, and the signal receiving efficiency and definition are improved. Through the design, the nuclear magnetic resonance probe and the downhole operation tool provided by the embodiment of the application realize the effect of improving the nuclear magnetic resonance signal-to-noise ratio.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 shows a schematic view of an overall structure provided by an embodiment of the present invention;
FIG. 2 is a schematic view of the overall structure at another angle provided by an embodiment of the present invention;
fig. 3 shows a schematic diagram of a first carrier provided by an embodiment of the present invention;
FIG. 4 shows a schematic diagram of a coil position provided by an embodiment of the present invention;
fig. 5 shows a schematic diagram of a radio frequency field provided by an embodiment of the present invention.
Reference numerals in the specific embodiments are as follows:
100. A nuclear magnetic resonance probe;
110. A probe body; 120. a first carrier plate; 130. a second carrier plate; 140. a first radio frequency field; 150. a second radio frequency field; 160. an overlapping portion;
121. A first coil; 122. a first loop; 123. a first return line; 124. a crosspiece; 125. a first enclosed space; 126. a second surrounding space;
131. a second coil; 132. a second loop; 133. a second return line; 134. a third surrounding space; 135. a fourth enclosed space;
A. The diameter of the bottom surface; B. the flexible board is long; C. the soft board is high; D. the probe is high.
Detailed Description
Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.
In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: there are three cases, a, B, a and B simultaneously. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).
In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.
In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.
For convenience of description, an X-axis direction in fig. 1 to 5 is defined as a left-right direction, an arrow of the X-axis is directed to a left direction, a Y-axis direction is defined as a front-rear direction, an arrow of the Y-axis is directed to a front direction, a Z-axis direction is defined as an up-down direction, and an arrow of the Z-axis is directed to an up direction.
In the petroleum well logging process, nuclear magnetic resonance plays an important role in the technical field of petroleum drilling due to the advantages of accurate measurement parameters, no influence of stratum properties, multiple acquired downhole parameters and the like. When nuclear magnetic resonance logging is performed, as the nuclear magnetic resonance probe is introduced into the underground through the underground pipe column, the pipe column is used as a channel of underground slurry water flow, signals collected by the nuclear magnetic resonance probe are often influenced, the collected signals include underground stratum geological information and are doped with useless information of the slurry water flow in the pipe column, noise is generated, and the logging effect is seriously influenced if the proportion of meaningful signals to meaningless noise is too low.
The inventor notices that in the prior art, only a coil single loop is adopted, a coil is wound outside a magnetic core and is used for signal operation of a nuclear magnetic resonance probe, the manufacturing process is complex, an additional coil is needed to be used as a spoiler antenna for reducing noise, the signal intensity of an antenna for transmitting and receiving signals and the capability of receiving signals are not high, the signal to noise ratio is difficult to effectively improve, and the information definition of nuclear magnetic resonance acquisition is limited. In order to make the information acquired by nuclear magnetic resonance logging clearer, it is important how to improve the signal-to-noise ratio of the nuclear magnetic resonance probe.
In order to solve the problems, the inventor designs a nuclear magnetic resonance probe, which is provided with a first carrier plate and a second carrier plate, wherein the first carrier plate and the second carrier plate are respectively provided with a first coil with two first loops and a second coil with two second loops, a first return line is formed at the intersection of the two first loops, a second return line is formed at the intersection of the two second loops, the first return line is not parallel to the second return line, the nuclear magnetic resonance probe is more dense in acquisition of signals through the design, the first coil and the second coil are arranged relatively independently through the first carrier plate and the second carrier plate, interference is not easy to form, the interference degree of signals is low, the acquired signals are not easy to dope noise, the signal definition is higher, and the signal to noise ratio of the nuclear magnetic resonance probe is improved.
The nuclear magnetic resonance probe disclosed by the embodiment of the application can be used for drilling, well cementation, logging, well completion, water injection, underground operation and the like, and can also be applied to any other scene requiring nuclear magnetic resonance.
According to some embodiments of the present application, referring to fig. 1 and 2, the present application provides a nuclear magnetic resonance probe 100, including a probe body 110, a first carrier plate 120 covering an outer wall of the probe body 110 along a circumferential direction of the probe body 110, and a second carrier plate 130 covering an outer side of the first carrier plate 120 along the circumferential direction of the probe body 110; the first carrier plate 120 and the second carrier plate 130 are respectively provided with a first coil 121 and a second coil 131, the first coil 121 is provided with two first loops 122, a first return line 123 is formed at the junction of the two first loops 122, the second coil 131 is provided with two second loops 132, a second return line 133 is formed at the junction of the two second loops 132, and the first return line 123 and the second return line 133 are not parallel.
The probe body 110 is used for playing a role of a permanent magnet in nuclear magnetic resonance, and needs to be made of a magnetic material to achieve a nuclear magnetic resonance effect, and can be made of different types of magnetic materials according to actual needs, for example, samarium cobalt, ferrite, neodymium iron boron or superconducting materials, which are not particularly limited in the embodiment of the application, because part of materials used for manufacturing the probe body 110 have the characteristics of brittleness and hardness, and in consideration of processing difficulty, the probe body 110 can also be formed in a form of bonding a plurality of small blocks of materials, which are not particularly limited in the embodiment of the application. In the embodiment of the present application, the probe body 110 is used for nuclear magnetic resonance of oil logging, in order to adapt to the shape and space of a pipeline in oil logging, the probe body 110 is a cylinder, of course, the shape of the probe body 110 can be adjusted to a certain extent according to the use environment, for example, the shape of the probe body 110 is set to a square body, a table body or other shapes according to the requirement, which is not limited in particular in the embodiment of the present application.
Since the first carrier plate 120 covers the outer wall of the probe body 110, and the second carrier plate 130 covers the outer wall of the first carrier plate 120, the materials of the first carrier plate 120 and the second carrier plate 130 should be suitable for the shape of the probe body 110 to some extent, for example. The first carrier plate 120 and the second carrier plate 130 may be made of flexible materials, so that the first carrier plate 120 and the second carrier plate 130 can be deformed adaptively along the outer wall shape of the probe body 110. Or the first carrier plate 120 and the second carrier plate 130 do not need to be elastically deformed, the shapes of the first carrier plate 120 and the second carrier plate 130 are adapted to the outer wall of the probe body 110, so that the first carrier plate 120 and the second carrier plate 130 can better cover the outer wall of the probe body 110, which is not particularly limited in the embodiment of the application.
The first coil 121 and the second coil 131 are coils having two loops, the first coil 121 has two first loops 122, the second coil 131 has two second loops 132, and since the first coil 121 is disposed on the first carrier plate 120 and the second coil 131 is disposed on the second carrier plate 130, it can be understood that the wires of the first coil 121 are wound in a number "8" arrangement or in an equivalent topology, for example, two "mouth" shapes having an intersection, and the winding manner of the second coil 131 is similar to that of the first coil 121. The first coil 121 may be a single-turn coil or a multi-turn coil, the second coil 131 may be a single-turn coil or a multi-turn coil, and the number of turns of the first coil 121 or the second coil 131 may be adjusted according to actual needs, which is not particularly limited in the embodiment of the present application. The first return line 123 is formed at the junction of the two first loops 122, the second return line 133 is formed at the junction of the two second loops 132, the first return line 123 may be formed by one or more wires in the first coil 121, or may be formed by a plurality of wires in the first coil 121 together, and the second return line 133 may be formed by one or more wires in the second coil 131, or may be formed by a plurality of wires in the second coil 131 together, depending on the number of turns of the first coil or the second coil, which is not particularly limited in the embodiment of the present application. The number of wires of the first and second return lines 123 and 133 is positively correlated with the number of turns of the first and second coils 121 and 131, respectively. The first return line 123 and the second return line 133 are not parallel to each other, i.e., it is understood that the first return line 123 and the second return line 133 may be disposed orthogonally or in other non-parallel intersecting ways.
Through setting up first coil 121 on first support plate 120, set up second coil 131 on second support plate 130, make first coil 121 and second coil 131's first return line 123 and second return line 133 be nonparallel each other, make first coil 121 and second coil 131's magnetic field produce alternately, first coil and second coil can receive the position of signal more closely simultaneously, and the signal of receipt is more clear. Through setting up the first coil that has two first return circuits and the second coil that has two second return circuits, make first coil and second coil can transmit simultaneously with the elimination useless signal when receiving the signal, make the signal noise who obtains reduce, do not need additionally to set up the vortex coil, two coils simultaneous working make signal strength and accuracy higher, increased the signal receiving area, signal reception is more abundant, has improved nuclear magnetic resonance's signal to noise ratio.
According to some embodiments of the present application, referring to fig. 1 and 3, the length of the first carrier plate 120 in the circumferential direction of the probe body 110 is not more than one half of the circumference of the bottom surface of the probe body 110.
The perimeter of the bottom surface of the probe body 110 refers to the product of the bottom surface diameter a and the n, and the length of the first carrier plate 120 along the circumferential direction of the probe body 110 refers to the length B of the flexible plate, i.e. the length B of the flexible plate is not greater than the product of the n and the bottom surface diameter a. For example, in one embodiment, the diameter a of the bottom surface of the probe body 110 is 11.4cm, and the length of the first carrier plate 120 along the circumferential direction of the probe body 110 is no greater than 11.4 pi/2 cm, i.e. the length B of the flexible board is no greater than about 17.9cm. It is understood that the first carrier plate 120 circumferentially covers no more than half of the side wall of the probe body 110.
During logging, one side of the probe body 110 is abutted against the well wall, the other side is an underground pipeline, if nuclear magnetic resonance signals are sent out on one side abutted against the well wall, the nuclear magnetic resonance signals can directly penetrate stratum rock to obtain geological conditions, if the nuclear magnetic resonance signals are sent out on one side close to the underground pipeline, impurities such as water flow and slurry in the underground pipeline can seriously interfere with signal obtaining efficiency, and can influence information imaging obtained by signals in the correct direction, the length of the first carrier plate 120 along the circumferential direction of the probe body 110 is not more than one half of the circumference of the bottom surface of the probe body 110, the signal direction of the first coil 121 on the first carrier plate 120 is mainly concentrated on one side of the probe body 110, unnecessary signals are not easy to disperse on other parts of the probe body 110, directivity of data collected by nuclear magnetic resonance is more accurate, noise is not easy to increase due to the unnecessary signals, and signal to noise is improved.
According to some embodiments of the present application, referring to fig. 1 and 3, the length of the second carrier plate 130 in the axial direction of the probe body 110 is smaller than the length of the probe body 110 in the axial direction.
The length of the probe body 110 in the axial direction is the probe height D, and the length of the second carrier plate 130 along the axial direction of the probe body 110 refers to the soft board height C, i.e. the soft board height C is smaller than the probe height D. For example, in one embodiment, the probe height D of the probe body 110 is 60cm, and the length of the second carrier plate 130 along the axial direction of the probe body 110 is less than 60cm, that is, the soft board height C is less than 60cm. On the premise that the soft board height C is smaller than the probe height D, the length of the soft board height C may be set differently according to practical situations, for example, in order to reduce the end effect of the nmr probe 100, the length of the soft board height C may be far smaller than the probe height D, the length of the soft board height C may be one third or less of the probe height D, for example, in order to increase the signal effective area of the nmr probe 100, the length of the soft board height C may be increased appropriately, and those skilled in the art may adjust the soft board height C and the probe height D accordingly according to practical situations and practical operation needs, only by ensuring that the soft board height C is smaller than the probe height D, which is not limited in particular in the embodiment of the application.
The end effect is generated for various reasons, and the generated end effect can influence the magnetic field of the nuclear magnetic resonance probe 100, so that the accuracy of nuclear magnetic resonance imaging is reduced, meanwhile, the resistance of the coil is increased, the additional loss of the motor is caused, and the motor efficiency is reduced. In order to avoid the occurrence of the end effect, the length of the second carrier plate 130 along the axial direction of the probe body 110 is smaller than the length of the probe body 110 along the axial direction, so that the length of the second coil 131 arranged on the second carrier plate 130 along the axial direction of the probe body 110 is indirectly shorter than the length of the second coil 131 along the axial direction of the probe body 110, a certain distance is kept between the second coil 131 and the two ends of the probe body 110, the end effect of the static magnetic field is effectively avoided, and the stability and the accuracy of nuclear magnetic resonance signals are ensured.
According to some embodiments of the present application, referring to fig. 1, 2 and 3, the wires of the first coil 121 at both ends in the axial direction of the probe body are formed with rungs 124 parallel to each other, and the distance between the rungs 124 and the nearest end of the probe body 110 is smaller than the distance between the rungs 124 and the center of the probe body 110 in the axial direction; the length of the first carrier plate 120 along the axial direction of the probe body 110 is smaller than the length of the probe body 110 along the axial direction.
The crosspiece 124 is formed by guiding the first coil 121 along the two ends of the axial direction of the probe body 110, it will be understood that the crosspiece 124 should at least contain two wires located at the upper and lower ends of the first coil 121, and may also contain two groups of wires located at the upper and lower ends of the first coil 121, and the number of wires forming the crosspiece 124 may be different according to the number of turns of the coils, i.e. the crosspiece 124 itself belongs to a part of the wires in the first coil 121. The rungs 124 at the upper and lower ends are parallel to each other, and if the wires at the upper and lower ends in the first coil 121 are arc-shaped, it is understood that the parallel areas of the wires at the upper and lower ends are the smallest in this case, and the length of the rungs 124 in the right and left directions is the shortest. The center of the probe body 110 in the axial direction refers to the length midpoint of the probe height D, i.e., the distance between the crosspiece 124 and the nearest end of the probe body 110 is less than the length midpoint of the probe height D. The length of the first carrier plate 120 along the up-down direction is smaller than the length of the probe body 110 along the up-down direction, that is, the height C of the flexible plate is smaller than the height D of the probe.
By making the distance between the crosspiece 124 and the nearest end of the probe body 110 smaller than the distance between the crosspiece 124 and the length center of the probe height D, the two crosspieces 124 can be respectively close to the two ends of the probe body 110, thereby expanding the effective range of the first coil 121 for generating signals along the up-down direction and improving the range of nuclear magnetic resonance signals.
According to some embodiments of the application, referring to fig. 4, the first return line 123 at least partially overlaps the second return line 133.
The first return line 123 at least partially overlaps the second return line 133, i.e. at least part of the wires in the first return line 123 overlap at least part of the wires in the second return line 133 outside the probe body 110.
By overlapping the first return line 123 at least partially with the second return line 133 and overlapping the signals of the first coil 121 and the second coil 131, a sensitive region of nuclear magnetic resonance is formed, and when in actual use, accurate nuclear magnetic resonance logging towards a designated region can be realized by adjusting the corresponding position of the overlapping position of the first return line 123 and the second return line 133 conveniently.
According to some embodiments of the application, referring to fig. 4, the first return line 123 at least partially overlaps a midpoint of the second return line 133, and the second return line 133 at least partially overlaps a midpoint of the first return line 123.
At least some of the wires in the first return line 123 overlap the midpoints of at least some of the wires in the second return line 133, at least some of the wires in the second return line 133 overlap the midpoints of at least some of the wires in the first return line 123, and according to practical situations, at least some of the wires in the first return line 123 overlap the midpoints of at least some of the wires in the second return line 133, and at least some of the wires in the second return line 133 overlap the midpoints of at least some of the wires in the first return line 123.
By overlapping the first return line 123 at least partially with the midpoint of the second return line 133, the second return line 133 at least partially overlaps with the midpoint of the first return line 123, so that the signal overlapping portion 160 of the first coil 121 and the second coil 131 is more accurate, and the direction of nuclear magnetic resonance signal emission can be more accurately adjusted during actual use, so as to achieve better nuclear magnetic resonance logging effect.
According to some embodiments of the present application, referring to fig. 4, two first circuits 122 are respectively formed with a first surrounding space 125 and a second surrounding space 126, and the shapes of the first surrounding space 125 and the second surrounding space 126 are adapted to the first carrier plate 120; the two second loops 132 are respectively formed with a third surrounding space 134 and a fourth surrounding space 135, and the shapes of the third surrounding space 134 and the fourth surrounding space 135 are matched with the shape of the second carrier 130; the first carrier 120 and the second carrier 130 are rectangular.
The first surrounding space 125 and the second surrounding space 126 refer to areas of the first carrier plate 120, which are not covered by the wires of the first coil 121, of the two first loops 122 of the first coil 121, one first loop 122 forms the first surrounding space 125, the other first loop 122 forms the second surrounding space 126, the third surrounding space 134 and the fourth surrounding space 135 refer to areas of the second carrier plate 130, which are not covered by the wires of the second coil 131, of the two second loops 132 of the second coil 131, one second loop 132 forms the third surrounding space 134, and the other second loop 132 forms the fourth surrounding space 135. The shapes of the first surrounding space 125 and the second surrounding space 126 are adapted to the first carrier plate 120, the shapes of the third surrounding space 134 and the fourth surrounding space 135 are adapted to the second carrier plate 130, the first carrier plate 120 and the second carrier plate 130 are rectangular, which means that the shapes of the first surrounding space 125, the second surrounding space 126, the third surrounding space 134 and the fourth surrounding space 135 are respectively adapted to the first carrier plate 120 and the second carrier plate 130, the shapes of the first surrounding space 125, the second surrounding space 126, the third surrounding space 134 and the fourth surrounding space 135 are similar to rectangles, the shapes of the first surrounding space 125 and the second surrounding space 126 can be approximately spliced to be adapted to the shapes of the first carrier plate 120, the shapes of the third surrounding space 134 and the fourth surrounding space 135 can be approximately spliced to be rectangular to be adapted to the shapes of the second carrier plate 130, for example, the shapes of the first surrounding space 125 and the second surrounding space 126 are two triangles, the first coil 121 and the second coil 131 can be made to be close to the second carrier plate 131 or the second carrier plate 131 can be approximately limited to the second carrier plate 120, the special topology can be realized, and the topology of the first carrier plate 121 and the second carrier plate 120 can be approximately limited to the second carrier plate 120, or the special topology can be realized.
The first surrounding space 125, the second surrounding space 126, the third surrounding space 134 and the fourth surrounding space 135 are formed into shapes corresponding to the rectangular first carrier plate 120 and the rectangular second carrier plate 130, so that the first coil 121 and the second coil 131 can form a rectangular topological structure, and the first surrounding space 125, the second surrounding space 126, the third surrounding space 134 and the fourth surrounding space 135 are arranged, so that no-lead parts are left in the first coil 121 and the second coil 131, the energy is more dispersed, the heat dissipation capacity is improved, and the heat loss during operation is reduced.
According to some embodiments of the present application, referring to fig. 4 and 5, the first coil 121 and the second coil 131 form a first rf field 140, the probe body 110 forms a second rf field 150, and the first rf field 140 and the second rf field 150 have an overlapping portion 160, and the overlapping portion 160 is located at a side of the probe body 110 close to the first return line 123.
The first rf field 140 formed by the first coil 121 and the second coil 131, where the first rf field 140 refers to a portion where the signal sent by the first coil 121 overlaps the signal sent by the second coil 131, and according to the positions of the first coil 121 and the second coil 131 outside the probe body 110, an additional signal may be generated on the side of the probe body 110 away from the first return line 123, where in the nmr logging, such additional signal does not help to improve the signal-to-noise ratio of the nmr, so in the embodiment of the application, the first rf field 140 does not include such additional signal, and only refers to the signals of the first coil 121 and the second coil 131 in the direction close to the main detection direction, i.e. the signals close to the first return line 123 of the first coil 121. The second rf field 150 formed by the probe body 110 is a signal surrounding the probe body 110 in all directions, so the second rf field 150 and the first rf field 140 have an overlapping portion 160, and the overlapping portion 160 is located at a side of the probe body 110 close to the first return line 123 because the first rf field 140 is a signal generated by the first coil 121 and the second coil 131 at a side close to the first return line 123.
By forming the first coil 121 and the second coil 131 into the first rf field 140, the second rf field 150 generated by the probe body 110 and the first rf field 140 form the overlapping portion 160 located on the side of the probe body 110 close to the first return line 123, so that signals are denser, and the definition and the signal-to-noise ratio of the information acquired by the nmr probe 100 are improved.
According to some embodiments of the application, referring to fig. 5, the first rf field 140 and the second rf field 150 are orthogonal to each other.
The first rf field 140 and the second rf field 150 are orthogonal to each other, i.e., the first rf field 140 formed by the first coil 121 and the second coil 131 and the second rf field 150 formed by the probe body 110 are orthogonal to each other.
By making the first rf field 140 and the second rf field 150 orthogonal to each other, the overlap 160 formed by the first rf field 140 and the second rf field 150 receives the nmr signal more comprehensively, so that all signals can be collected, the signal resource can be utilized more fully, the first rf field 140 and the second rf field 150 are orthogonal to each other and are not related to noise, and the increase of the signals is more obvious, thereby improving the signal-to-noise ratio.
The present application also provides a downhole tool comprising a nuclear magnetic resonance probe 100 as described above, according to some embodiments of the present application.
When the nuclear magnetic resonance probe 100 provided by the embodiment of the application is applied to a downhole operation tool, the first coil 121 and the second coil 131 are relatively independent and are not easy to interfere with each other by arranging the first carrier plate 120 and the second carrier plate 130 and arranging the first coil 121 and the second coil 131 on the first carrier plate 120 and the second carrier plate 130, so that the stability and the definition of nuclear magnetic resonance signals of the downhole operation tool are improved. The first coil 121 has two first loops 122 and the second coil 131 has two second loops 132, so that the number of turns of the coil can be increased within a limited range, and the signal intensity of nuclear magnetic resonance is improved. By making the first return line 123 formed by the intersection of the two first loops 122 and the second return line 133 formed by the intersection of the two second loops 132 not parallel to each other, the magnetic fields of the coils are crossed, the received signals are denser, and the signal receiving efficiency and definition are improved. Through the design, the nuclear magnetic resonance probe 100 and the downhole tool provided by the embodiment of the application achieve the effect of improving the nuclear magnetic resonance signal-to-noise ratio.
Claims (10)
1. The nuclear magnetic resonance probe is characterized by comprising a probe body in a cylindrical shape, a first carrier plate which is covered on the outer wall of the probe body along the circumferential direction of the probe body, and a second carrier plate which is covered on the outer side of the first carrier plate along the circumferential direction of the probe body;
The first carrier plate and the second carrier plate are respectively provided with a first coil and a second coil, the first coil is provided with two first loops, the intersection of the two first loops is commonly formed with a first return line, the second coil is provided with two second loops, the intersection of the two second loops is commonly formed with a second return line, and the first return line is not parallel to the second return line.
2. A nuclear magnetic resonance probe according to claim 1, wherein,
The length of the first carrier plate along the circumferential direction of the probe body is not more than one half of the circumference of the bottom surface of the probe body.
3. A nuclear magnetic resonance probe according to claim 1, wherein,
The length of the second carrier plate along the axial direction of the probe body is smaller than the length of the probe body along the axial direction.
4. A nuclear magnetic resonance probe according to claim 1, wherein,
The leads at the two ends of the first coil along the axial direction of the probe body are provided with cross pieces which are parallel to each other, and the distance between the cross pieces and the nearest end of the probe body is smaller than the distance between the cross pieces and the center of the probe body along the axial direction;
The length of the first carrier plate along the axial direction of the probe body is smaller than the length of the probe body along the axial direction.
5. A nuclear magnetic resonance probe according to claim 1, wherein,
The first return line at least partially overlaps the second return line.
6. A nuclear magnetic resonance probe according to claim 5, wherein,
The first return line at least partially overlaps a midpoint of the second return line at least partially overlaps a midpoint of the first return line.
7. A nuclear magnetic resonance probe according to claim 1, wherein,
The two first loops are respectively provided with a first surrounding space and a second surrounding space, and the shapes of the first surrounding space and the second surrounding space are matched with the first carrier plate;
The two second loops are respectively provided with a third surrounding space and a fourth surrounding space, and the shapes of the third surrounding space and the fourth surrounding space are matched with the shape of the second carrier plate;
The first carrier plate and the second carrier plate are rectangular.
8. A nuclear magnetic resonance probe according to claim 1, wherein,
The first coil and the second coil form a first radio frequency field, the probe body forms a second radio frequency field, the first radio frequency field and the second radio frequency field are provided with an overlapping part, and the overlapping part is positioned at one side of the probe body close to the first return line.
9. A nuclear magnetic resonance probe according to claim 8,
The first radio frequency field and the second radio frequency field are orthogonal to each other.
10. A downhole tool for use in a well, characterized by comprising the following steps: a nuclear magnetic resonance probe as claimed in any one of claims 1 to 9.
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| CN109236283A (en) * | 2018-09-05 | 2019-01-18 | 中国石油大学(北京) | NMR logging instrument probe and NMR logging instrument |
| CN110568519A (en) * | 2019-10-14 | 2019-12-13 | 中国海洋石油集团有限公司 | Probe simulator of nuclear magnetic detector |
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| US5453692A (en) * | 1992-08-06 | 1995-09-26 | Hitachi, Ltd. | RF probe for nuclear magnetic resonance imaging (MRI) devices |
| AU737283B2 (en) * | 1998-07-30 | 2001-08-16 | Schlumberger Holdings Limited | Nuclear magnetic resonance logging with azimuthal resolution using gradient coils |
| DE19844762B4 (en) * | 1998-09-29 | 2005-02-24 | Siemens Ag | Device for the inductive coupling of a nuclear magnetic resonance signal into a receiving antenna as well as a medical intervention instrument |
| US6100694A (en) * | 1999-02-24 | 2000-08-08 | Varian, Inc. | Multiple-tuned bird cage coils |
| JP5207662B2 (en) * | 2007-05-31 | 2013-06-12 | 株式会社日立製作所 | Magnetic field coil and magnetic resonance imaging apparatus |
| US8779768B2 (en) * | 2012-06-12 | 2014-07-15 | The Florida State University Research Foundation, Inc. | NMR RF probe coil exhibiting double resonance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109236283A (en) * | 2018-09-05 | 2019-01-18 | 中国石油大学(北京) | NMR logging instrument probe and NMR logging instrument |
| CN110568519A (en) * | 2019-10-14 | 2019-12-13 | 中国海洋石油集团有限公司 | Probe simulator of nuclear magnetic detector |
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