CN115467658B - Probe structure of nuclear magnetic resonance logging instrument while drilling - Google Patents
Probe structure of nuclear magnetic resonance logging instrument while drilling Download PDFInfo
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- CN115467658B CN115467658B CN202210992316.8A CN202210992316A CN115467658B CN 115467658 B CN115467658 B CN 115467658B CN 202210992316 A CN202210992316 A CN 202210992316A CN 115467658 B CN115467658 B CN 115467658B
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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
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
-
- 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
- E21B47/01—Devices for supporting measuring instruments on drill bits, pipes, rods or wirelines; Protecting measuring instruments in boreholes against heat, shock, pressure or the like
- E21B47/017—Protecting measuring instruments
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geophysics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- Geophysics And Detection Of Objects (AREA)
- Earth Drilling (AREA)
Abstract
本发明属于测井设备技术领域，涉及一种随钻核磁共振测井仪探头结构，包括密封连接的芯轴一与芯轴二由芯；芯轴一、芯轴二以连接点为中心分别对称安装有软磁骨架、磁体固定轴、芯轴居中块、弹簧垫圈、固定螺母、锁紧螺母一、穿线端子固定板和锁紧螺母二；两个软磁骨架对称套设于芯轴一、芯轴二上，软磁骨架上安装短射频屏蔽层和射频屏蔽层；两个磁体外壳对称安装，一端与防磨套连接，另一端分别与压力平衡装置和调谐装置连接。本发明具有合理的密封结构、布线结构，整体结构具有耐高温、耐高压、耐腐蚀等优点。
The present invention belongs to the technical field of logging equipment, and relates to a probe structure of a nuclear magnetic resonance logging instrument while drilling, including a core shaft 1 and a core shaft 2 which are sealed and connected; the core shaft 1 and the core shaft 2 are symmetrically installed with a soft magnetic skeleton, a magnet fixing shaft, a core shaft centering block, a spring washer, a fixing nut, a locking nut 1, a threading terminal fixing plate and a locking nut 2 with the connection point as the center; two soft magnetic skeletons are symmetrically sleeved on the core shaft 1 and the core shaft 2, and a short radio frequency shielding layer and a radio frequency shielding layer are installed on the soft magnetic skeleton; two magnet shells are symmetrically installed, one end is connected to the anti-wear sleeve, and the other end is connected to the pressure balance device and the tuning device respectively. The present invention has a reasonable sealing structure and wiring structure, and the overall structure has the advantages of high temperature resistance, high pressure resistance, corrosion resistance, etc.
Description
Technical Field
The invention belongs to the technical field of logging equipment, and relates to a nuclear magnetic resonance logging instrument probe structure while drilling.
Background
Compared with cable logging, nuclear magnetic resonance logging while drilling can detect formation parameters when mud is not immersed into the formation or is immersed in the formation shallowly, can provide more accurate data for formation evaluation, can realize total porosity measurement irrelevant to lithology, can accurately conduct formation physical analysis, is simpler in low gradient magnetic field design, enables light fluid identification, is convenient for data real-time transmission and processing, is beneficial to adjustment at any time, can accurately analyze whether a low-resistance oil reservoir is caused by mud, bound water or capillary bound water, needs hydrogen-containing index correction when the porosity in a gas layer or a condensate gas layer is low, can judge the approximate lithology of the formation and the pore structure of the formation by using the distribution form of a T2 spectrum, and can conduct horizontal well guiding by using the actually measured porosity distribution and the T2 spectrum form during logging while drilling.
At present, the technology of nuclear magnetic logging while drilling turbine generator, magnet, algorithm, electronic circuit and related software is relatively mature, and the probe is the main part of polarizing stratum, transmitting radio frequency pulse and receiving signal, so the probe structure of nuclear magnetic resonance logging while drilling instrument is the main target. The prior art only provides a general layout mode, does not provide a specific realizable structure for a complex underground environment and a practical nuclear magnetic resonance logging-while-drilling mode, does not consider that the internal structures such as a magnet and the like are not damaged by larger make-up torque before the well is put down, and the probe is invalid due to the underground high-temperature and high-pressure environment, corrosiveness, bending moment, torque, drill string pressure, vibration and the like, and does not provide a reasonable wiring mode and a sealing structure.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a nuclear magnetic resonance logging while drilling instrument probe structure, which has a reasonable mechanical structure, protects an internal structure, realizes target magnetic field measurement, has a reasonable sealing and wiring structure, can adapt to a complex nuclear magnetic resonance logging while drilling environment, and finally realizes nuclear magnetic resonance logging while drilling.
The technical scheme for solving the problems is that the nuclear magnetic resonance logging instrument probe structure while drilling is characterized in that:
Comprises a first mandrel and a second mandrel,
The first mandrel and the second mandrel are locked together by a mandrel bolt and are in sealing connection;
The first mandrel and the second mandrel are symmetrically provided with a soft magnetic framework, a magnet fixing shaft, a mandrel centering block, a spring washer, a fixing nut, a first locking nut, a threading terminal fixing plate and a second locking nut respectively by taking a connecting point as a center;
The two soft magnetic frameworks are symmetrically sleeved on the first mandrel and the second mandrel, one ends of the two soft magnetic frameworks are connected, the other ends of the two soft magnetic frameworks are respectively connected with the main magnet, a large pore canal in the soft magnetic frameworks is connected with the first mandrel through a transition cabin, a small pore canal is connected with the first mandrel and the second mandrel, a step hole at the large end face is connected with a magnet fixing shaft, a large outer diameter step of the soft magnetic frameworks is connected with a magnet shell and is connected with an anti-wear sleeve through a key three guide, a short radio frequency shielding layer and a radio frequency shielding layer are arranged on the small outer diameter step of the soft magnetic frameworks, a soft magnetic buffer block I is arranged outside the radio frequency shielding layer, a soft magnetic buffer block component is arranged outside the short radio frequency shielding layer, the soft magnetic buffer block is sleeved outside the radio frequency shielding layer, an antenna part is sleeved outside the soft magnetic buffer block, two ends of the antenna part are respectively connected with the anti-wear sleeve in a sealing mode, the anti-wear shell is arranged outside the antenna part, the anti-wear sleeve is fixedly connected with the magnet fixing shaft, the magnet fixing shaft is symmetrically arranged on the first mandrel and the second mandrel, the outer side is fixedly provided with the soft magnetic frameworks, one end of the soft magnetic frameworks is provided with the main magnet buffer block, the main magnet is fixedly arranged on the fixing shaft nut, the main magnet buffer block is fixedly arranged on the fixing shaft, and the main magnet fixing shaft nut is fixedly arranged on the spindle fixing shaft.
The two magnet shells are symmetrically arranged, one end of each magnet shell is connected with the anti-abrasion sleeve, the other end of each magnet shell is connected with the corresponding pressure balancing device and the corresponding tuning device, the tuning device comprises a tuning drill collar, the pressure balancing device comprises a pressure balancing cabin, threading terminals are arranged in the magnet shells, the pressure balancing cabin is connected with the magnet shells in a sealing mode, one end of a mandrel is installed in the tuning drill collar, and two ends of the mandrel are installed in the pressure balancing cabin.
Further, a slurry channel is arranged in the first mandrel and the second mandrel, the slurry channel is respectively communicated with the slurry channel in the tuning drill collar and the slurry channel in the pressure balance cabin, a transition cabin is arranged at the joint of the first mandrel and the second mandrel, a pin sealing piece is arranged on the transition cabin, components and parts can be additionally arranged in the later stage, a wire passing groove is arranged outside the transition cabin, a sealing stage and a thread stage are respectively machined on the first mandrel and the second mandrel, and a sealing piece seven is arranged in the sealing stage.
Further, the oil injection sealing nozzles are arranged on the tuning drill collar, tuning cavities are symmetrically arranged, a tuning circuit board is arranged in the tuning cavities, and a tuning cabin cover is arranged on the tuning cavities.
Further, the pressure balance shell is provided with an oil filling hole for installing an oil outlet sealing nozzle, a piston hole and a slurry channel are arranged in the pressure balance shell, a pressure balance piston, a spring, a first pressure balance spring seat and a second pressure balance spring seat are arranged in the piston hole,
The second pressure balance spring seat is fixed in the piston hole, the pressure balance piston is fixedly connected with the first pressure balance spring seat, the spring is sleeved on the first pressure balance spring seat and the second pressure balance spring seat, the springs are respectively fixed on the first pressure balance spring seat and the second pressure balance spring seat by pins, the first pressure balance spring seat is provided with a sealing groove, the sealing groove is provided with a third sealing element, and the second pressure balance spring seat is fixed on the pressure balance shell by a first fixing screw;
the sealing plug is used for sealing the piston hole, a slurry channel is arranged on the sealing plug, and the sealing plug is connected with the slurry channel of the pressure balance shell.
Further, the relay fixing frame is provided with relay mounting grooves which are uniformly distributed along the circumference.
Further, the anti-wear sleeve is provided with a threaded hole for fixing the anti-wear shell, and the anti-wear sleeve is provided with a sealing groove for installing the sealing element eight.
Furthermore, a conical surface step is arranged in the magnet shell and used for limiting a central block of the mandrel, and an overflow valve is arranged on a piston hole of the magnet shell.
Further, the threading terminal and the threading terminal fixing plate are respectively provided with a corresponding threading hole, and the threading terminal is provided with a key groove for installing a key seven.
Further, a groove and a sealing groove are formed in the outer wall surface of the pressure balance piston, lubricating grease is filled in the groove, and a sealing piece IV is installed in the sealing groove.
Further, the soft magnetic buffer block assembly consists of three soft magnetic buffer blocks, the middle of the soft magnetic buffer block assembly is connected with the soft magnetic buffer blocks by a common nonmagnetic pin, the soft magnetic buffer block assembly is provided with a threading hole, and the threading hole is communicated with the threading hole on the soft magnetic framework.
The invention has the advantages that:
1) The probe structure of the nuclear magnetic resonance logging instrument while drilling can be matched with the existing power generation device, electronic circuits and corresponding software to realize the polarization, pulse emission and nuclear magnetic signal acquisition of a target layer under a preset magnetic field while drilling. The design of the antenna part mainly refers to parameters such as magnetic field gradient, voltage and the like, is embedded in glass fiber reinforced plastic, is matched with an anti-wear sleeve and an anti-wear shell to meet the logging while drilling requirement, provides wiring design of electronic components such as a tuning capacitor, a relay and the like according to the designed parameters such as pulse frequency and the like, analyzes and designs a reasonable mechanical structure, a reasonable wiring mode and a pressure regulating device for guaranteeing normal work of the magnet, the electronic components and the like while drilling when analyzing and designing a downhole working environment.
2) The probe structure of the nuclear magnetic resonance logging while drilling instrument provided by the invention can realize offshore and terrestrial formation measurement while drilling information and feed back underground nuclear magnetic resonance signals.
3) The probe structure of the nuclear magnetic resonance logging while drilling instrument provided by the invention realizes logging while drilling aiming at environments such as deep wells, ultra-deep wells, high temperature, high pressure, vibration and the like, and the invention systematically designs the whole layout, the sealing, the bearing components and the like, and provides reasonable structural layout in the aspects of material selection, stress analysis and the like.
4) The probe structure of the nuclear magnetic resonance logging while drilling instrument provided by the invention can shield interference noise in an environment aiming at a severe working environment with weak signal and larger background noise during logging while drilling.
5) The probe structure of the nuclear magnetic resonance logging instrument while drilling provided by the invention has the advantages that the external screw thread of the probe is consistent with the screw thread of the existing drill rod, the accurate butt joint of the universal drilling tool taper screw thread is ensured, the size of an internal mud channel is reasonably transited, and the smoothness of drilling mud is ensured.
6) The pressure balancing part can ensure that the components such as electronic components, magnets and the like arranged in the probe are regulated to be a proper internal temperature and pressure environment along with temperature, pressure and the like, and can also change the stroke, the shape and the size according to the calculation of the mechanical parameters such as the bonding strength, the rigidity and the like according to the actual requirements, so as to balance and regulate the internal pressure and the external pressure.
7) The probe structure of the nuclear magnetic resonance logging instrument while drilling adopts a magnet layout mode that a main magnet is symmetrical, a soft magnet is arranged in the middle, the main magnet is matched with a non-magnetic buffer device, the soft magnet is matched with a non-magnetic pad block, glue is prepared at a special high temperature, the rigidity is ensured, meanwhile, the buffering performance is also realized, the finite element calculation is carried out on the design of the strength, the uniformity and the gradient of a magnetic field, the magnet part is further optimized, and the rationality of the whole structure is also met while the magnetic field requirement is met.
8) According to the probe structure of the nuclear magnetic resonance logging while drilling instrument, provided by the invention, the antenna is embedded in a selected manner, the wear-resistant shell and the symmetrical wear-resistant sleeve are designed, so that the sufficient wear resistance and bending resistance of the antenna part are ensured, and the requirements of transmitting radio frequency pulses and receiving signals in the rotary drilling process can be met.
9) According to the probe structure of the nuclear magnetic resonance logging instrument while drilling, the inside of the mandrel is provided with erosion resistance, and the mandrel is symmetrically arranged and has buffering property, centering property and tensile and compressive properties through ingenious matching of the mandrel, the centering block, the elastic pad, the fixing nut and the anti-drop nut.
Drawings
FIG. 1 is a schematic view of the assembly of the present invention;
FIG. 2 is a schematic view of the assembly split 1 of the present invention;
FIG. 3 is a schematic view of the assembly split 2 of the present invention;
FIG. 4 is a schematic view of the assembly split 3 of the present invention;
FIG. 5 is a schematic view of the assembly split 4 of the present invention;
FIG. 6 is a schematic diagram of a simulation analysis of the strength and uniformity of a magnet according to the present invention;
FIG. 7 is a schematic of an overall three-dimensional explosion of the present invention;
FIG. 8 is a schematic diagram of a pressure equalization portion minute gun of the present invention;
FIG. 9 is a schematic diagram of the relief valve position of the present invention.
Tuning collar 1, seal six 2, tuning hatch 3, oil injection seal 4, magnet housing 5, key one 6, seal one 7, threading terminal mounting plate 8, seal two 9, locknut two 10, locknut one 11, key two 12, mounting nut 13, mandrel centering block 14, mandrel one 15, threading terminal 16, magnet stationary shaft 17, magnet stationary shaft nut 18, main magnet buffer block 19, main magnet 20, screw 21, wear sleeve 22, soft magnetic buffer block assembly 23, soft magnetic buffer block one 24, short radio frequency shield 25, soft magnetic 26, antenna portion 27, wear housing 28, key three 29, seal eight 30, soft magnetic backbone 31, key four 32, relay mount 33, key six 34, radio frequency shield 35, pin seal 36, seal seven 37, mandrel bolt 38, high temperature tape 39, mandrel two 40, key five 41, wear housing screw 42, oil outlet seal 43, seal 44, pressure balance two 45, seal three 46, spring 47, pressure balance one, 49, five seal one, seal 50, seal two, seal gaskets 52, pressure balance one, seal two, seal plug 52, pressure balance one, seal valve fixing screw 52, pressure balance one, seal 52, seal two, seal valve fixing screws 52.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
Because the working conditions of deep wells, ultra-deep wells and offshore oil field logging while drilling are complex, the development of the technology is hindered by the short plates of the current nuclear magnetic resonance logging while drilling on the probe structural design, and therefore, the invention provides a nuclear magnetic resonance while drilling head structure which is reasonable and is matched with the current matching technology.
Referring to fig. 1-9, a logging-while-drilling nmr logging tool probe structure includes a tuning collar 1, an oiling seal nozzle 4, a tuning hatch 3, a main magnet 20, a soft magnet 26, an antenna portion 27, a magnet fixing shaft 17, a relay fixing frame 33, an anti-wear sleeve 22, an anti-wear housing 28, a pin seal 36, a first mandrel 15, a first key 6, a second key 12, a third key 29, a fourth key 32, a fifth key 41, a sixth key 34, a seventh key 12, an overflow valve 56, a second mandrel 40, a first seal 7, a second seal 9, a sixth seal 2, a seventh seal 37, an eighth seal 30, a mandrel bolt 38, a magnet fixing shaft nut 18, a pressure balancing portion, an oiling seal nozzle 43, a magnet housing 5, a mandrel centering block 14, a fixing nut 13, a first lock nut 11, a second lock nut 10, a spring washer 54, a threading terminal 16, a threading terminal fixing plate 8, a soft magnetic skeleton 31, a first soft magnetic buffer block 24, a soft magnetic buffer block assembly 23, a main magnet buffer block 19, a short radio frequency shielding layer 25, and a radio frequency shielding layer 35.
The first mandrel 15 is connected with the second mandrel 40, guided by the fifth key 41 and locked together by the mandrel bolt 38, and is in sealing connection, the pin sealing member 36 is arranged on the first mandrel 15 and the second mandrel 40, and the soft magnetic framework 31, the magnet fixing shaft 17, the mandrel centering block 14, the spring washer 54, the fixing nut 13, the first locking nut 11, the threading terminal fixing plate 8 and the second locking nut 10 are symmetrically arranged on the first mandrel 15 and the second mandrel 40.
The end of a first mandrel 15 is provided with a tuning drill collar 1, the end of a second mandrel 40 is provided with a pressure balance cabin 52, the end of the second mandrel is guided by a fourth key 32 and is arranged on a soft magnetic framework 31, a sixth key 34 is arranged on the first mandrel 15, two soft magnetic frameworks 31 are symmetrically sleeved on the first mandrel 15 and the second mandrel 40, one end of the second soft magnetic framework 31 is connected with one end of a main magnet 20, the inner large pore canal of the soft magnetic framework 31 is connected with the first mandrel 15 through a transition cabin, the small pore canal is connected with the first mandrel 15 and the second mandrel 40, a stepped hole at the large end surface is connected with a magnet fixing shaft 17, the stepped position of the large outer diameter of the soft magnetic framework 31 is connected with a magnet shell 5 and is guided by a third key 29 and is connected with an anti-abrasion sleeve 22, a short radio frequency shielding layer 25 and a radio frequency shielding layer 35 are arranged on the stepped position of the small outer diameter of the soft magnetic framework 31, a soft magnetic 26 and a soft magnetic buffer block 24 are arranged outside the short radio frequency shielding layer 25, a soft magnetic buffer block assembly 23 is arranged outside the soft magnetic shielding layer 25, the soft magnetic 26 is arranged outside the soft magnetic buffer layer 35, an antenna part 27 is arranged outside the soft magnetic shielding layer 27, the antenna part 27 is connected with the soft magnetic layer 26, two ends are respectively sleeved outside the soft magnetic framework 26, two ends are respectively connected with the fixed shaft 22 and the fixed shaft 17, the main magnet 35 is fixedly sleeved on the main magnet 15, the main magnet 15 is arranged on the main magnet shell, one end of the main magnet 35 is fixedly connected with the main magnet shell, one end of the main magnet 35, the main magnet is fixedly connected with the main magnet 17, one end of the main magnet is fixedly sleeved with the main magnet 31, the main magnet is fixedly connected with the main magnet shell, and one end of the main magnet 17, the main magnet is fixedly connected with the main magnet 17, and one end of the main magnet 17, and one end is fixedly connected with the main magnet, and the main magnet 17, the other end of the tuning drill collar 1 is respectively connected with a pressure balancing device and a tuning device, one end of the tuning drill collar 1 is guided by a key I6 to be respectively and hermetically connected with the mandrel I and the magnet housing 5, a tuning hatch cover 3 is arranged on the tuning drill collar, a threading terminal 16 is guided by a key II 12 to be arranged in the magnet housing 5, one end of the pressure balancing part is guided by a key I6 to be arranged in the magnet housing 5 and is hermetically connected with the mandrel II 40, and an inner hole is hermetically connected with the mandrel II.
Further, a slurry channel is arranged in the first mandrel 15 and the second mandrel 40, the slurry channels are respectively communicated with the slurry channel in the tuning drill collar 1 and the slurry channel in the pressure balance part, a transition cabin is arranged at the joint of the first mandrel 15 and the second mandrel 40, a pin sealing piece 36 is arranged on the transition cabin, components can be added in the later stage, a wire passing groove is arranged outside the transition cabin, a sealing stage and a thread stage are respectively processed on the first mandrel 15 and the second mandrel 40, and a sealing piece seven 37 is arranged in the sealing stage.
Further, an oiling sealing nozzle 4 is installed on the tuning drill collar 1, tuning cavities are symmetrically arranged, a tuning circuit board is installed in each tuning cavity, steps are arranged at the tuning cavities, fixing threaded holes are machined in the steps, threading holes and oil passing holes are formed in the cavities to the end face positions, centering key grooves are machined in the outer machining mode, symmetrical key grooves and sealing grooves are formed in the sealing steps, a sealing piece 7 is installed at the sealing groove, a sealing groove is also formed in the sealing step, a sealing piece two 9 is installed at the sealing groove, and external conical threads are machined at the other end of the sealing groove.
Further, the pressure balancing device comprises a pressure balancing shell 52, a first sealing element 7, a second sealing element 9, a third sealing element 46, a fourth sealing element 50, an oiling sealing nozzle 4, a sealing plug 51, a first fixing screw 53, a second fixing screw 55, a third fixing screw 56, a pin, a pressure balancing piston 49, a spring 47, a first pressure balancing spring seat 48 and a second pressure balancing spring seat 45, wherein the second pressure balancing spring seat 45 is connected with the pressure balancing shell 52.
The pressure balance piston 49 is provided with a threaded hole, the pressure balance piston 49 and the pressure balance spring seat I48 are connected together through a fixing screw II 55, the pressure balance piston 49 is provided with a groove, the groove is filled with lubricating grease, the pressure balance piston 49 is provided with a sealing groove, and the sealing groove is provided with a sealing piece IV 46.
The pressure balance shell 52 is provided with a centering key groove and a fixing threaded hole on the outer portion, the fixing threaded hole is used for installing a first fixing screw 53, a piston hole, a slurry channel, an inner step and a threaded hole for fixing a sealing plug 51 are formed in the fixing threaded hole, the pressure balance shell 52 is provided with a sealing step, a sealing groove is formed in the sealing step and used for installing a first sealing element 7, a key groove is formed in the sealing step, a sealing groove is formed in the inner step and used for installing a second sealing element 9, an oil filling hole is formed in the pressure balance shell 52 and used for installing an oil outlet sealing nozzle, the pressure balance shell 52 is provided with a slurry hole, external slurry flows into the slurry hole during drilling to adjust the stroke of the piston, and an inner cone thread is formed in one end of the pressure balance shell 52.
Further, the spring 47 is sleeved on the first pressure balance spring seat 48 and the second pressure balance spring seat 45, the spring 47 is fixed on the steps of the first pressure balance spring seat 48 and the second pressure balance spring seat 45 by pins, a seal groove is arranged on the first pressure balance spring seat 48, a seal piece III 46 is arranged on the seal groove, and the second pressure balance spring seat 45 is fixed on the pressure balance shell 52 by a fixing screw I53 as shown in fig. 3.
Further, the sealing plug 51 is used for sealing the piston hole, a slurry channel is arranged on the sealing plug 51 and is connected with a slurry channel of the pressure balance shell 52, a sealing groove mounting sealing member five 50 is arranged on the sealing plug 51, the sealing plug 51 is provided with a through hole, the through hole is opposite to a threaded hole of the pressure balance shell 52, and the sealing plug 51 is fixed on the pressure balance shell 52 by a fixing screw three 56.
Further, the tuning hatch cover 3 is provided with a counter bore corresponding to the upper threaded hole and is fixed by a common bolt, and the tuning hatch cover 3 is provided with a sealing groove for installing the sealing element six 2.
Further, the inner hole of the magnet fixing shaft 17 is provided with a semicircular hole for wiring, the magnet fixing shaft 17 is provided with a threaded hole corresponding to the hole on the soft magnetic framework 31 for positioning the screw 21, and the magnet fixing shaft 17 is provided with a threaded section for installing a magnet fixing shaft nut 18.
Further, the magnet securing shaft nut 18 has a stepped bore for positioning with a cylindrical step on the spindle centering block 14.
Further, the mandrel centering block 14 has a threading hole for wiring, and the mandrel centering block 14 has a cylindrical step for positioning with the magnet fixing shaft nut 18.
Further, the relay fixing frame 33 is provided with relay mounting grooves, and the relay mounting grooves are uniformly distributed along the circumference.
Further, the soft magnetic buffer block assembly consists of three blocks, the middle of the soft magnetic buffer block assembly is connected with the soft magnetic framework 31 by a common nonmagnetic pin, and the soft magnetic buffer block assembly is provided with a threading hole which is communicated with the threading hole on the soft magnetic framework.
Further, the wear sleeve 22 has a threaded hole for securing the wear housing 28, and the wear sleeve 22 has a seal groove for mounting the seal eight 30.
Further, the magnet housing 5 is provided with a centering key groove for assembly centering, a conical surface step is arranged in the magnet housing 5 and used for limiting the mandrel centering block 14, and the magnet housing 5 is provided with a threaded hole site for installing the overflow valve 56.
Further, the threading terminal 16 corresponds to the threading hole on the threading terminal fixing plate 8, and the threading terminal 16 is provided with a key groove for installing the key seven 12.
The assembling process of the nuclear magnetic resonance logging while drilling probe structure provided by the invention is as follows:
The preparation method comprises the steps of magnetizing a main magnet block by using high Wen Teshu preparation glue, bonding the main magnet block into a magnetic ring shape by matching with a fixture, assembling a hollow magnetic rod with a columnar structure after a magnetic ring is solidified to complete the preparation of the main magnet 20, wherein the main magnet can be made of an alnico permanent magnet material, then installing the main magnet 20 and a main magnet buffer block 19 on a magnet fixing shaft 17 for standby, arranging high-temperature enameled wires inside the magnet fixing shaft 17, finally arranging the parts above with a soft magnetic framework 31 in pairs, arranging high-temperature enameled wires go weak and threading holes inside the magnetic framework 31, and fixing the parts by using screws 21, wherein the main magnet buffer block 19 can be made of a non-magnetic material or a magnetic conductive material according to magnetic field requirements.
The soft magnetic blocks are matched with a high Wen Teshu preparation adhesive to be adhered into a ring shape, the ring-shaped soft magnetic blocks are adhered into a column shape, the preparation of the soft magnetic blocks 26 is completed, a soft magnetic structure is added between the two main magnets 20, so that magnetic fields at two sides are pulled to the middle to meet the application range and uniformity of the magnetic fields, the soft magnetic is used as a magnetic conduction effect, neodymium iron boron is selected as a material of the embodiment, and acrylic ester, high-temperature resin and curing agent are selected as an adhesive material of the soft magnetic blocks 26.
The range of application of the antenna designed according to the embodiment is 60cm, the coil responsible for signal receiving and radio frequency transmission is mainly designed into a copper sheet form, and is embedded in the glass fiber reinforced plastic, and the assembly preparation of the antenna part 27 can be completed only by exposing the wiring points.
The key six 34, the key four 32 and the pin sealing piece 36 are arranged on the mandrel one 15, then the relay fixing frame 33 and the relay are arranged, the required high-temperature enameled wire is arranged, finally the structure is arranged in the soft magnetic framework 31, the arranged wires pass through the threading holes of the soft magnetic framework 31, the number of the relays and the number of the transmitting frequencies are related, in the embodiment, the number of the capacitors which are connected is controlled by the four relays, the relays are controlled by the program of the control circuit, the DC power supply is used as a power source in the well logging process, the DC power supply is used for 580V, square waves are generated through the power amplifier, and sine waves are generated through the filter.
The key five 41, the key four 32 and the seal seven 37 are arranged in the mandrel two 40, the mandrel two 40 is abutted with the mandrel one 15, and the mandrel two 40 and the mandrel one 15 are fixed by a mandrel bolt 38.
Further, the soft magnetic buffer block I24, the soft magnetic buffer block component 23, the key III 29, the short radio frequency shielding layer 25, the seal eight 30, the radio frequency shielding layer 35 and the wear-resistant sleeve 22 are arranged on the soft magnetic framework 31, the soft magnetic 26 and the antenna part 27 are arranged on the soft magnetic framework 31 which is already in butt joint with the mandrel I15, and finally the other soft magnetic framework 31 is in butt joint with the mandrel II 40, and the wiring of the antenna part and the like is connected together according to functions at the same time.
The magnet fixing shaft nut 18 is screwed, then the mandrel centering block 14, the spring washer 54, the fixing nut 13 and the first locking nut 11 are sequentially arranged, meanwhile, the key seven 12 is arranged in the threading terminal 16, the threading terminal fixing plate 8 is arranged in the second locking nut 10, and meanwhile, the high-temperature enameled wire is led out from the magnet fixing shaft 17 to the mandrel centering block 14 to the threading terminal 16 and finally to the threading terminal fixing plate 8, and the magnet shell 5 is arranged.
The first sealing element 7, the second sealing element 9 and the first key 6 are arranged in the tuning drill collar 1, the sixth sealing element 2 is arranged in the tuning cabin cover 3, then the tuning cabin cover 3 is fixed in the tuning drill collar 1 through screws, the tuning cabin cover 3 is in butt joint with the magnet shell 5, the tuning function is to adjust the resonance frequency, sine waves can occur when the inductance is added with the capacitance, the inductance is fixed, the sine wave frequency can be changed when the capacitance is changed, the antenna is emitted, different capacitances are connected into the LC resonance circuit through the relay to generate sine waves with different frequencies, the tuning capacitance and the circuit board are arranged in the tuning drill collar 1, and the high-temperature enameled wire is connected to the relay on the relay framework.
The method comprises the steps of assembling the pressure balance parts, specifically fixing the spring 47 on the first pressure balance spring seat 48 and the second pressure balance spring seat 45 by pins according to the design requirement of required spring stiffness, installing the second fixing screw 55 into the first pressure balance spring seat 48, connecting the pressure balance piston 49 provided with the third sealing element 46 with the first pressure balance spring seat 48 by the second fixing screw 55, finally filling the groove of the pressure balance piston 49 with high-temperature lubricating silicone grease, assembling the pressure balance piston parts, installing the first sealing element 7, the second sealing element 9 and the first key 6 into the pressure balance shell 52, assembling the completed pressure balance piston parts into the pressure balance shell 52, fixing the pressure balance piston parts by the first fixing screw 53, finally abutting the pressure balance parts with the magnet shell 5, selecting TC11 from the pressure balance shell 52 in the mechanical property and nonmagnetic principle material and paying attention to the stress concentration position in the processing, selecting the first pressure balance piston 49 and the pressure balance spring seat 45 from the mechanical property, nonmagnetic principle and beryllium material and the pressure balance shell 52, and selecting the bronze material QBe from the pressure balance shell 52 to bite the bronze material 3850 from the bronze material 35.
The components are assembled together, only the oiling sealing nozzle 4, the oil outlet sealing nozzle 43 and the overflow valve 56 are assembled, then the opening pressure of the overflow valve is adjusted to 5Mpa, the overflow valve is assembled on the magnet housing 5, the oiling sealing nozzle mounting hole and the oil outlet sealing nozzle mounting hole are connected with the circulating oiling machine, the whole tightness of the vacuumizing test instrument is tested, the simethicone is injected after the sealing performance is not problematic, the oiling is stopped until the pressure balance piston 49 reaches a preset position, and the oiling sealing nozzle 4 and the oil outlet sealing nozzle 43 are assembled, so that the whole assembly is completed. It is noted that the seal member selected in this embodiment is a fluororubber seal ring with a hardness of 80, the specific seal size is selected according to the standard, silicone grease is required to be applied when the seal ring is installed, and thread seizure preventive paste is applied to all thread structures.
Preferably, in this embodiment, all the materials of the key, the main magnet buffer block 19 and the screw are stainless steel 0Cr17Ni4CuNb, so that the mechanical properties are satisfied and no magnetic interference exists.
Preferably, the high Wen Teshu in this example produces a metallic powder with a predominantly shielding effect for the glue formulation, a high temperature resin, a curing agent and an acrylate for the connection.
Preferably, in the embodiment, the magnet designed by adopting the finite element electromagnetic simulation method can be checked and adjusted by using the three-dimensional magnet measuring instrument after the preparation is completed.
Preferably, the materials of the tuning drill collar 1, the oiling seal nozzle 4, the tuning hatch 3, the magnet fixing shaft 17, the relay fixing frame 33, the anti-abrasion sleeve 22, the first mandrel 15, the overflow valve 56, the second mandrel 40, the mandrel bolt 38, the magnet fixing shaft nut 18, the oil-out seal nozzle 43, the magnet shell 5, the mandrel centering block 14, the fixing nut 13, the first locking nut 11, the second locking nut 10, the spring washer 54, the threading terminal 16, the threading terminal fixing plate 8 and the soft magnetic framework 31 are all TC11, the soft magnetic buffer block 24 and the soft magnetic buffer block component 23 are made of high-temperature resistant and non-magnetic materials polytetrafluoroethylene, the materials of the short radio frequency shielding layer 25 and the radio frequency shielding layer 35 are C12000 with shielding performance, the weld joints between the tuning drill collar 1 and the magnet shell 5, the weld joints between the magnet shell 5 and the anti-abrasion sleeve 22 and between the magnet shell 5 and the pressure balance shell 52 are reserved in the embodiment, and the anti-abrasion protection sleeve 52 is fixed in a final welding mode, the two main magnets are selected to be arranged oppositely, the anti-abrasion protection shell 28 is selected from epoxy resin in the embodiment.
Preferably, from room temperature 25 ℃ to downhole environment 175 ℃, the stroke of pressure balance piston 49 due to thermal expansion of silicone oil can be adjusted as needed according to the following formula for the volume expansion of liquid from temperatures t 1 to t 2:
Vt2＝Vt1[1+β(t2-t1)]
Wherein V t1、Vt2 -the volume of the single liquid at temperatures t 1 and t 2;
Beta- - -the average volume expansion coefficient of a single liquid temperature from t 1 to t 2.
B.2 nuclear magnetic resonance logging while drilling probe graduation process
The assembled probe is placed in a stratum simulator in a signal shielding environment, then the stratum simulator is connected with the existing logging while drilling electronic circuit, the electronic circuit is connected with a control console computer, logging debugging software is opened, the instrument is powered on to start testing of gain, b1, measurement, noise, ringing, high voltage, direct current low voltage and the like, and if parameters which do not meet logging requirements are met, various reasons are analyzed to debug the probe until all the parameters meet the requirements.
The nuclear magnetic resonance logging while drilling probe structure provided by the invention is in butt joint with other downhole instruments:
the nuclear magnetic resonance logging probe while drilling which is loaded into a special box body and transported to a destination is transported, NC conical threads are arranged at two ends of the nuclear magnetic resonance logging probe while drilling, the upper end of the nuclear magnetic resonance logging probe can be butted with an electronic circuit short drill collar and a power generation device, the lower part of the nuclear magnetic resonance logging probe is close to a drill bit, the torque of the buckling torque is 3KN.m, and if the nuclear magnetic resonance logging probe is in a drilling special condition such as a stuck drilling condition, a downhole fishing tool can be adopted, so that the nuclear magnetic resonance logging probe can bear the impact load of a pulling force 250T or a jar and the like.
In summary, the nuclear magnetic resonance logging while drilling instrument probe structure provided by the invention can perform nuclear magnetic resonance logging while drilling in a complex stratum environment in deep wells, ultra-deep wells or offshore drilling with equipment such as nuclear magnetic resonance electronic circuits while drilling, logging software, generators while drilling and the like, has the functions of polarizing stratum fluid, providing reasonable gradient magnetic fields and adjusting the internal and external pressure of the probe, and has the advantages of high temperature resistance, high pressure resistance, corrosion resistance, impact resistance and the like compared with the existing nuclear magnetic resonance logging while drilling scheme. The integral structure has good compatibility with the existing underground drilling tool, reduces nuclear magnetic resonance logging cost, and lays a solid foundation for further researching the advanced nuclear magnetic resonance logging algorithm while drilling, the magnetic field structure, accurately knowing stratum information and the like.
The foregoing description is only exemplary embodiments of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present invention, or direct or indirect application in other related system fields are included in the scope of the present invention.
Claims (10)
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| CN116950643B (en) * | 2023-09-19 | 2023-11-17 | 中海油田服务股份有限公司 | Circuit framework structure of logging while drilling instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102536199A (en) * | 2012-02-16 | 2012-07-04 | 中国石油天然气集团公司 | Controllable source while-drilling nuclear logging tool calibration device and calibration method |
| CN110761782A (en) * | 2019-11-13 | 2020-02-07 | 中国石油天然气集团有限公司 | Azimuth while-drilling nuclear magnetic resonance logging device and method for geological guidance |
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| CN102650208B (en) * | 2012-05-04 | 2015-05-06 | 中国石油大学(北京) | Nuclear magnetic resonance logger probe while drilling and nuclear magnetic resonance logger while drilling |
| CN102704925B (en) * | 2012-06-06 | 2015-02-18 | 中国石油化工股份有限公司 | Interwell electromagnetic logging system |
| CN105201496B (en) * | 2015-09-23 | 2018-03-09 | 中国石油大学(北京) | NMR logging instrument probe and antenna excitation method with double-deck magnet |
| CN105240000B (en) * | 2015-09-23 | 2018-04-17 | 中国石油大学(北京) | The NMR logging instrument and its probe of more investigation depths, antenna excitation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102536199A (en) * | 2012-02-16 | 2012-07-04 | 中国石油天然气集团公司 | Controllable source while-drilling nuclear logging tool calibration device and calibration method |
| CN110761782A (en) * | 2019-11-13 | 2020-02-07 | 中国石油天然气集团有限公司 | Azimuth while-drilling nuclear magnetic resonance logging device and method for geological guidance |
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