CN115467658A - 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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- CN115467658A CN115467658A CN202210992316.8A CN202210992316A CN115467658A CN 115467658 A CN115467658 A CN 115467658A CN 202210992316 A CN202210992316 A CN 202210992316A CN 115467658 A CN115467658 A CN 115467658A
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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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- 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)
- Earth Drilling (AREA)
Abstract
The invention belongs to the technical field of logging equipment, and relates to a probe structure of a nuclear magnetic resonance logging instrument while drilling, which comprises a mandrel I and a mandrel II which are hermetically connected; the core shaft I and the core shaft II are respectively and symmetrically provided with a soft magnetic framework, a magnet fixing shaft, a core shaft centering block, a spring washer, a fixing nut, a locking nut I, a threading terminal fixing plate and a locking nut II by taking a connecting point as a center; the two soft magnetic frameworks are symmetrically sleeved on the first core shaft and the second core shaft, and the short radio frequency shielding layer and the radio frequency shielding layer are arranged on the soft magnetic frameworks; the two magnet shells are symmetrically arranged, one end of each magnet shell is connected with the anti-abrasion sleeve, and the other end of each magnet shell is connected with the pressure balancing device and the tuning device respectively. The invention has reasonable sealing structure and wiring structure, and the whole structure has the advantages of high temperature resistance, high pressure resistance, corrosion resistance and the like.
Description
Technical Field
The invention belongs to the technical field of logging equipment, and relates to a probe structure of a nuclear magnetic resonance logging-while-drilling instrument.
Background
Compared with cable logging, the nuclear magnetic resonance logging while drilling can detect formation parameters when mud is not immersed into the formation or is immersed into the formation shallowly, and can provide more accurate data for formation evaluation; the total porosity measurement irrelevant to lithology can be realized, and the formation physical property analysis can be accurately carried out; the low gradient magnetic field design makes the identification of the light fluid more concise; data are transmitted and processed in real time, so that adjustment can be made at any time; the real-time porosity distribution form can accurately analyze whether the low-resistance oil reservoir is caused by mud, bound water or capillary bound water; when the porosity of a drilling gas layer or a condensate gas layer is low, hydrogen index correction is needed, and the general lithology and pore structure of the stratum can be judged by utilizing the distribution form of a T2 spectrum; and the porosity distribution and the T2 spectrum form measured in real time can be utilized during logging while drilling to perform horizontal well guiding and the like.
At present, the technologies of a nuclear magnetic logging while drilling turbine generator, a magnet, an algorithm, an electronic circuit, related software and the like are relatively mature, and a probe is a main part for polarizing a stratum, transmitting a radio frequency pulse, receiving a signal and the like, so that the probe structure of a nuclear magnetic resonance logging while drilling instrument is mainly targeted. The prior art only provides a general layout mode, does not provide a specific realizable structure for a complex underground environment and an actual realization of a nuclear magnetic resonance logging-while-drilling mode, does not consider that the internal structures such as magnets and the like cannot be damaged by a large upper buckling torque before the underground is processed, causes failure of a probe in the underground high-temperature and high-pressure environment, corrosivity, bending moment, torque, pressure and vibration of a drill rod column and the like, and further 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 probe structure of a nuclear magnetic resonance logging-while-drilling instrument, 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 as follows: a probe structure of a nuclear magnetic resonance logging while drilling instrument 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 sealed connection;
the core shaft I and the core shaft II are respectively and symmetrically provided with a soft magnetic framework, a magnet fixing shaft, a core shaft centering block, a spring washer, a fixing nut, a locking nut I, a threading terminal fixing plate and a locking nut II by taking a connecting point as a center;
the soft magnetic frameworks are symmetrically sleeved on the first core shaft and the second core shaft, one ends of the two soft magnetic frameworks are connected, the other ends of the two soft magnetic frameworks are respectively connected with a main magnet, a large pore passage in the soft magnetic frameworks is connected with the first core shaft through a transition cabin, a small pore passage is connected with the first core shaft and the second core shaft, 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-abrasion sleeve through a key III guide, and 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 and 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 sleeve is sleeved outside the radio frequency shielding layer; the antenna part is sleeved outside the soft magnet, and two ends of the antenna part are respectively connected with the anti-abrasion sleeve in a sealing manner; the anti-abrasion shell is arranged outside the antenna part and is fixedly connected with the anti-abrasion sleeve; the magnet fixing shafts are symmetrically arranged and are respectively sleeved on the core shaft I and the core shaft II, the outer sides of the magnet fixing shafts are fixed with main magnets, one ends of the main magnets are connected with the soft magnetic framework, and the other ends of the main magnets are provided with main magnet buffer blocks; the main magnet buffer block is fixed on the magnet fixing shaft by a magnet fixing shaft nut; the relay fixing frame is arranged on the first mandrel.
The two magnet shells are symmetrically arranged, one end of each magnet shell is connected with the anti-abrasion sleeve, and the other end of each magnet shell is connected with the pressure balancing device and the tuning device respectively; the tuning device comprises a tuning drill collar, and the pressure balancing device comprises a pressure balancing cabin; a threading terminal is arranged in the magnet shell; the pressure balance cabin is hermetically connected with the magnet shell, the tuning drill collar is arranged at the tail end of the mandrel, and the pressure balance cabin is arranged at the two tail ends of the mandrel.
Furthermore, a slurry channel is arranged inside the first mandrel and the second mandrel, the slurry channel is respectively communicated with the slurry channel inside the tuning drill collar and the slurry channel inside the pressure balance cabin, a transition cabin is arranged at the joint of the first mandrel and the second mandrel, a contact pin sealing element is arranged on the transition cabin, components can be additionally arranged at the later stage, a wire passing groove is arranged outside the transition cabin, a sealing platform stage and a thread platform stage are respectively machined on the first mandrel and the second mandrel, and a sealing element seventh is arranged at the sealing platform stage.
Furthermore, the oil injection sealing nozzles are installed on the tuning drill collar, tuning cavities are symmetrically arranged, a tuning circuit board is installed in the tuning cavities, and tuning hatches are installed on the tuning cavities.
Furthermore, an oil filling hole is processed on the pressure balance shell 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 pressure balance spring seat I and a pressure balance spring seat II are arranged in the piston hole,
the pressure balance spring seat II is fixed in the piston hole, the pressure balance piston is fixedly connected with the pressure balance spring seat I, the spring is sleeved on the pressure balance spring seat I and the pressure balance spring seat II, the spring is respectively fixed on steps of the pressure balance spring seat I and the pressure balance spring seat II through pins, a seal groove is formed in the pressure balance spring seat I, a seal member III is installed in the seal groove, and the pressure balance spring seat II is fixed on the pressure balance shell through a fixing screw I;
the sealing plug is used for sealing the piston hole, and a slurry channel is arranged on the sealing plug and is connected with the slurry channel of the pressure balance shell.
Furthermore, the relay fixing frame is provided with relay mounting grooves which are evenly distributed along the circumference.
Furthermore, a threaded hole is formed in the anti-abrasion sleeve and used for fixing the anti-abrasion shell, and a sealing groove is formed in the anti-abrasion sleeve and used for installing an eight sealing element.
Furthermore, a conical step is arranged in the magnet shell and used for limiting the central block of the mandrel; an overflow valve is arranged on a piston hole of the magnet shell.
Furthermore, 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 mounting a key seven.
Furthermore, 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 element IV is installed in the sealing groove.
Further, above-mentioned soft magnetic buffer block subassembly comprises three soft magnetic buffer blocks, and the centre is worn to link to each other with ordinary no magnetism pin, there is the through wires hole on the soft magnetic buffer block subassembly, and this through wires hole communicates with each other with the through wires hole on the soft magnetic skeleton.
The invention has the advantages that:
1) The probe structure of the nuclear magnetic resonance logging-while-drilling instrument can be matched with the conventional power generation device, an electronic circuit and corresponding software to realize the polarization, pulse emission and nuclear magnetic signal acquisition of a target layer under a preset magnetic field during drilling. The magnetic field design, the structure design and the material selection mainly depend on finite element calculation, and the magnetic field intensity and the uniformity are continuously adjusted to achieve the design purpose; the design of the antenna part mainly refers to parameters such as magnetic field gradient, voltage and the like, and is embedded in the glass fiber reinforced plastic, and the wear-resistant sleeve and the wear-resistant shell are matched to meet the logging-while-drilling requirement; providing wiring design of electronic components such as a tuning capacitor, a relay and the like according to parameters such as designed pulse frequency and the like; the underground working environment is analyzed and designed to obtain a reasonable mechanical structure, a wiring mode and a pressure adjusting device for guaranteeing normal work of magnets, electronic components and the like while drilling.
2) The probe structure of the nuclear magnetic resonance logging-while-drilling instrument can realize the detection of formation information while drilling on the sea and the land and the feedback of an underground nuclear magnetic resonance signal.
3) The nuclear magnetic resonance logging-while-drilling instrument probe structure provided by the invention realizes logging-while-drilling aiming at environments such as deep wells, ultra-deep wells, high temperature and high pressure, vibration and the like, the invention carries out systematic design on the whole layout, sealing and bearing parts 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 can shield interference noise in the environment aiming at the severe working environment with weak signals and larger background noise during logging-while-drilling.
5) According to the probe structure of the nuclear magnetic resonance logging-while-drilling instrument, the external connection thread of the probe is consistent with the thread of the existing drill rod, so that the accurate butt joint of the taper threads of the universal drilling tool is guaranteed; the size of the internal slurry channel is reasonable, and smooth drilling slurry is guaranteed.
6) According to the probe structure of the nuclear magnetic resonance logging while drilling instrument, the pressure balance part can ensure that components such as electronic components, magnets and the like arranged in the probe are adjusted to be in a proper internal temperature and pressure environment along with temperature, pressure and the like; the pressure balance part can also calculate according to the actual requirements and mechanical parameters such as bonding strength, rigidity and the like, change the stroke, the shape and the size, and further balance and adjust the internal pressure and the external pressure.
7) The probe structure of the nuclear magnetic resonance logging while drilling instrument provided by the invention adopts a magnet layout form that the main magnets are symmetrical and the soft magnets are arranged in the middle, the main magnets are matched with the non-magnetic buffer device, the soft magnets are matched with the non-magnetic cushion block, and the special high-temperature preparation glue ensures the rigidity and has the buffer property; finite element calculation is carried out on the strength, uniformity and gradient design of the magnetic field, so that the magnetic body part is optimized, and the rationality of the whole structure is also met while the requirement of the magnetic field is met.
8) According to the probe structure of the nuclear magnetic resonance logging-while-drilling instrument, the antenna is designed in an embedding mode, an anti-abrasion shell and a symmetrical anti-abrasion sleeve, so that the sufficient abrasion resistance and bending resistance of the antenna part are guaranteed, 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 while drilling instrument, erosion resistance is achieved inside the mandrel, and the mandrel is symmetrically arranged, and is ingeniously matched with the centering block, the elastic pad, the fixing nut and the anti-falling nut, so that buffering performance, centering performance and tensile compression resistance are achieved.
Drawings
FIG. 1 is an assembly schematic of the present invention;
FIG. 2 is a schematic illustration of the assembly and disassembly 1 of the present invention;
FIG. 3 is a schematic view of the assembly/disassembly 2 of the present invention;
FIG. 4 is a schematic illustration of the assembly and disassembly 3 of the present invention;
FIG. 5 is a schematic illustration of the assembly and disassembly 4 of the present invention;
FIG. 6 is a schematic diagram of the simulation analysis of the strength and uniformity of the magnet of the present invention;
FIG. 7 is an overall three-dimensional exploded schematic view of the present invention;
FIG. 8 is a schematic view of a pressure equalizing section of the present invention;
FIG. 9 is a schematic representation of the position of the overflow valve of the present invention.
The tuning drill collar comprises a tuning drill collar 1, a sixth sealing element 2, a tuning cabin cover 3, an oil filling sealing nozzle 4, a magnet housing 5, a first key 6, a first sealing element 7, a threading terminal fixing plate 8, a second sealing element 9, a second locking nut 10, a first locking nut 11, a second key 12, a fixing nut 13, a central spindle block 14, a first spindle 15, a threading terminal 16, a magnet fixing shaft 17, a magnet fixing shaft nut 18, a main magnet buffer block 19, a main magnet 20, a screw 21, an anti-abrasion sleeve 22, a soft magnet buffer block assembly 23, a first soft magnet buffer block 24, a short radio frequency shielding layer 25, a soft magnet 26, an antenna part 27, an anti-abrasion housing 28, a third key 29, an eight sealing element 30, a soft magnet framework 31, a fourth key 32, a relay fixing frame 33, a sixth key 34, a radio frequency shielding layer 35, a pin sealing element 36, a seventh sealing element 37, a spindle bolt 38, a high-temperature adhesive tape 39, a second spindle 40, a fifth key 41, an anti-abrasion sealing housing screw housing 42, an oil outlet sealing nozzle 43, a sealing element 44, a pressure balancing second sealing element 45, a third sealing element 46, a spring 47, a pressure balancing spring seat 48, a pressure balancing piston seat 48, a pressure balancing seat, a fifth sealing element 50, a pressure balancing piston seat 50, a pressure balancing seal ring 52, a pressure balancing seal 50, a pressure balancing washer 52, a pressure balancing seal washer 52, and a relief valve 55.
Detailed Description
In order to make 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 of the embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, 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.
The invention provides a reasonable nuclear magnetic resonance while-drilling probe structure which is matched with the current matched technology, because the working conditions of well drilling of deep wells, ultra-deep wells and offshore oil fields are complex, and the development of the technology is hindered by a short plate on the structural design of the probe of the nuclear magnetic resonance while-drilling well drilling at present.
Referring to fig. 1 to 9, a probe structure of a nuclear magnetic resonance logging while drilling tool comprises a tuning drill collar 1, an oil injection sealing nozzle 4, a tuning hatch cover 3, a main magnet 20, soft magnets 26, an antenna part 27, a magnet fixing shaft 17, a relay fixing frame 33, an anti-abrasion sleeve 22, an anti-abrasion casing 28, a pin sealing element 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 sealing element 7, a second sealing element 9, a sixth sealing element 2, a seventh sealing element 37, an eighth sealing element 30, a mandrel bolt 38, a magnet fixing shaft nut 18, a pressure balancing part, an oil outlet sealing nozzle 43, a magnet housing 5, a central mandrel block 14, a fixing nut 13, a first locking nut 11, a second locking nut 10, a spring washer 54, a threading terminal 16, a threading terminal fixing plate 8, a soft magnetic framework 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 element 36 is installed on the first mandrel 15, the second mandrel 40 are symmetrically provided with 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.
The tail end of the first mandrel 15 is arranged in the tuning drill collar 1, the tail end of the second mandrel 40 is arranged in the pressure balance cabin 52 and is guided by a fourth key 32 to be arranged on the soft magnetic framework 31, and a sixth key 34 is arranged on the first mandrel 15; the two soft magnetic frameworks 31 are symmetrically sleeved on the first mandrel 15 and the second mandrel 40, one ends of the two soft magnetic frameworks 31 are connected, the other ends of the two soft magnetic frameworks 31 are connected with the main magnet 20, a large pore passage in the soft magnetic framework 31 is connected with the first mandrel 15 through a transition cabin, a small pore passage is connected with the first mandrel 15 and the second mandrel 40, a step hole at the large end surface is connected with the magnet fixing shaft 17, a step of the large outer diameter of the soft magnetic framework 31 is connected with the magnet shell 5 and is connected with the anti-abrasion sleeve 22 through the guide of a third key 29, and a short radio frequency shielding layer 25 and a radio frequency shielding layer 35 are arranged on the step of the small outer diameter of the soft magnetic framework 31; a soft magnet 26 and a soft magnet buffer block I24 are arranged outside the radio frequency shielding layer 35; a soft magnetic buffer block component 23 is arranged outside the short radio frequency shielding layer 25; the soft magnet 26 is sleeved outside the radio frequency shielding layer 35; the antenna part 27 is sleeved outside the soft magnet 26, and two ends of the antenna part are respectively connected with the anti-abrasion sleeve 22 in a sealing manner; the wear-proof outer shell 28 is mounted outside the antenna part 27 and fixedly connected with the wear-proof sleeve 22; the magnet fixing shafts 17 are symmetrically arranged and are respectively sleeved on the first mandrel 15 and the second mandrel 40, the main magnets 20 are fixed on the outer sides of the two mandrels, one ends of the two main magnets are connected with the soft magnetic framework 31, and the other ends of the two main magnets are provided with main magnet buffer blocks 19; the main magnet buffer block 19 is fixed on the magnet fixing shaft 17 by a magnet fixing shaft nut 18; the relay fixing frame 33 is arranged at a position of a key six 34 on the mandrel I15; the magnetic body shell 5 is symmetrically arranged, one end of the magnetic body shell is connected with the anti-abrasion sleeve 22, and the other end of the magnetic body shell is respectively connected with the pressure balancing device and the tuning device; one end of the tuning drill collar 1 is guided by a key I6 to be respectively connected with the mandrel I and the magnet shell 5 in a sealing way, and a tuning cabin cover 3 is arranged on the tuning drill collar; the threading terminal 16 is arranged in the magnet shell 5 in a guiding way through the second key 12; one end of the pressure balance part is guided by a key I6 to be arranged on the magnet shell 5 and is in sealing connection, and an inner hole is in sealing connection with a core shaft II 40.
Furthermore, a slurry channel is arranged inside the first mandrel 15 and the second mandrel 40, the slurry channel is respectively communicated with the slurry channel inside the tuning drill collar 1 and the slurry channel of the pressure balance part, a transition cabin is arranged at the joint of the first mandrel 15 and the second mandrel 40, a contact pin sealing element 36 is arranged on the transition cabin, components can be additionally arranged at the later stage, a wire passing groove is arranged outside the transition cabin, a sealing platform stage and a thread platform stage are respectively machined on the first mandrel 15 and the second mandrel 40, and a sealing element seventh 37 is arranged at the sealing platform stage.
Furthermore, an oil injection sealing nozzle 4 is installed on the tuning drill collar 1, a tuning cavity is symmetrically arranged on the tuning drill collar, a tuning circuit board is installed inside the tuning cavity, a step is arranged at the tuning cavity, a fixing threaded hole is formed in the step, a threading hole and an oil passing hole are formed in the cavity, the cavity is located at the end face position, a centering key groove is formed in the outer portion of the cavity, a symmetrical key groove and a sealing groove are formed in the sealing step, a sealing piece I7 is installed in the sealing groove, a sealing groove is also formed in the inner sealing step, a sealing piece II 9 is installed in the sealing groove, and an outer conical thread is processed at the other end of the sealing groove.
Further, the pressure balancing device comprises a pressure balancing housing 52, a first sealing element 7, a second sealing element 9, a third sealing element 46, a fourth sealing element, a fifth sealing element 50, an oil filling 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 housing 52.
The pressure balance piston 49 is provided with a threaded hole, the pressure balance piston 49 is connected with a first pressure balance spring seat 48 through a second fixing screw 55, the pressure balance piston 49 is provided with a groove, lubricating grease is filled in the groove, the pressure balance piston 49 is provided with a sealing groove, and a fourth sealing element 46 is installed in the sealing groove.
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 steps of the first pressure balance spring seat 48 and the second pressure balance spring seat 45 respectively through pins, a seal groove is formed in the first pressure balance spring seat 48, a third seal 46 is installed in the seal groove, and the second pressure balance spring seat 45 is fixed on the pressure balance shell 52 through a first fixing screw 53 as shown in fig. 3.
Further, the sealing plug 51 is used for sealing the piston hole, a mud channel is formed in the sealing plug 51 and is connected with a mud channel of the pressure balance shell 52, a sealing groove is formed in the sealing plug 51 and is provided with a sealing element five 50, 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 through hole is fixed to the pressure balance shell 52 through a fixing screw three 56.
Furthermore, a counter bore corresponding to the upper threaded hole is formed in the tuning hatch 3 and fixed by a common bolt, and a sealing groove is formed in the tuning hatch 3 and used for mounting a sealing element six 2.
Furthermore, the inner hole of the magnet fixing shaft 17 is provided with a semicircular hole for wiring, a threaded hole on the magnet fixing shaft 17 corresponds to a hole on the soft magnetic framework 31 and is used for positioning the screw 21, and a threaded section is arranged on the magnet fixing shaft 17 and is used for installing the magnet fixing shaft nut 18.
Further, the magnet fixing shaft nut 18 is provided with a stepped hole for positioning with a cylindrical step on the central spindle block 14.
Further, a threading hole is formed in the central mandrel block 14 and used for wiring, and a cylindrical step is formed in the central mandrel block 14 and used for being located with the magnet fixing shaft nut 18.
Further, there are relay mounting grooves on the relay mount 33, the relay mounting grooves are evenly distributed along the circumference.
Further, soft magnetic buffer block subassembly comprises three, and the centre is worn with ordinary no magnetism pin and is even, soft magnetic buffer block subassembly is last to have the through wires hole and soft magnetic skeleton 31 to go up the through wires hole and communicate with each other.
Further, a threaded hole is formed in the wear-resistant sleeve 22 for fixing the wear-resistant outer shell 28, and a sealing groove is formed in the wear-resistant sleeve 22 for mounting a sealing member eight 30.
Furthermore, a centering key groove is formed in the magnet shell 5 and used for assembly and centering, and a conical step is formed in the magnet shell 5 and used for limiting the central block 14 of the mandrel; the magnet housing 5 is provided with a threaded bore for mounting an overflow valve 56.
Furthermore, threading holes are formed in the threading terminal 16 and the threading terminal fixing plate 8 respectively, and a key groove is formed in the threading terminal 16 and used for mounting the key seven 12.
The assembling process of the nuclear magnetic resonance logging while drilling probe structure provided by the invention is as follows:
magnetizing a main magnet block by using high-temperature special preparation glue and bonding the main magnet block into a magnetic ring by matching with a tool, assembling magnetic rings into a hollow magnetic rod with a columnar structure after curing to finish the preparation of a main magnet 20, wherein the main magnet can select AlNiCo as a permanent magnetic material, then installing the main magnet 20 and a main magnet buffer block 19 on a magnet fixing shaft 17 for later use, arranging a high-temperature enameled wire inside the magnet fixing shaft 17, finally assembling the parts and a soft magnetic framework 31 in a pairing mode, and the arranged high-temperature enameled wire passes through a through hole inside the soft magnetic framework 31 and is fixed by using a screw 21, wherein the main magnet buffer block 19 can select a non-magnetic material or a magnetic conductive material according to the requirement of a magnetic field.
The soft magnetic blocks are matched with a high-temperature special preparation adhesive to be connected into an annular shape, the annular soft magnetic is bonded into a columnar shape, the preparation of the soft magnetic 26 is completed, a soft magnetic structure is added between the two main magnets 20, the magnetic fields on the two sides are pulled to the middle to meet the use range and the uniformity of the magnetic fields, the soft magnetic acts as a magnetic conduction effect, the neodymium iron boron is selected as a material of the embodiment, and the acrylate, the high-temperature resin and the curing agent are selected as a bonding material of the soft magnetic 26.
The antenna designed according to this embodiment has a usage range of 60cm, and the coil for receiving signals and transmitting radio frequency is mainly designed in the form of copper sheet, and is embedded in the glass fiber reinforced plastic, so that the antenna part 27 can be assembled only by exposing the connection point.
The six keys 34, the four keys 32 and the pin sealing element 36 are arranged on the first mandrel 15, then a relay fixing frame 33 and relays are arranged, required high-temperature enameled wires are arranged, finally the structure is arranged in a soft magnetic framework 31, the arranged wires pass through threading holes of the soft magnetic framework 31, the number of the relays is related to the number of transmitting frequencies, in the embodiment, five transmitting frequencies are used, four relays are used for controlling the number of connected capacitors, the relays are controlled by a program of a control circuit, a direct current power supply is used as a power source during logging, the direct current power supply is used for 580V, square waves are generated through a power amplifier, and sine waves are generated through a filter.
And (3) installing the fifth key 41, the fourth key 32 and the seventh sealing element 37 into the second mandrel 40, butting the second mandrel 40 with the first mandrel 15, and fixing the two by using a mandrel bolt 38.
Furthermore, a soft magnetic buffer block I24, a soft magnetic buffer block assembly 23, a key III 29, a short radio frequency shielding layer 25, a sealing member VIII 30, a radio frequency shielding layer 35 and an anti-abrasion sleeve 22 are arranged on a soft magnetic framework 31, and soft magnets 26 and antenna parts 27 are arranged on the soft magnetic framework 31 which is in butt joint with the mandrel I15; finally, another soft magnetic skeleton 31 part is butted with the second mandrel 40, and the wiring of the antenna part and the like is connected together according to functions.
The magnet fixing shaft nut 18 is screwed, then the core shaft centering block 14, the spring washer 54, the fixing nut 13 and the locking nut 11 are sequentially arranged, the key seven 12 is arranged in the threading terminal 16, the threading terminal fixing plate 8 is arranged in the threading terminal fixing plate 8 and locked with the locking nut two 10, and the distributed high-temperature enameled wire is led out from the magnet fixing shaft 17 to the core shaft centering block 14 to the threading terminal 16 and finally to the threading terminal fixing plate 8 and is assembled with the magnet shell 5.
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, the tuning cabin cover 3 is fixed on the tuning drill collar 1 through screws, the parts are in butt joint with the magnet shell 5, the tuning function is to adjust the resonance frequency, the frequency of an inductor and a capacitor can generate sine waves, the inductor is fixed, the frequency of the sine waves can be changed by changing the capacitor, an antenna can be emitted, different capacitors are connected into an LC resonance circuit through a relay to generate sine waves with different frequencies, the tuning capacitor and a circuit board are arranged in the tuning drill collar 1, and a high-temperature enameled wire is connected onto the relay on the relay framework.
Assembling the pressure balance part, specifically fixing the spring 47 to a first pressure balance spring seat 48 and a second pressure balance spring seat 45 by using a pin according to the design requirement of the required spring stiffness, at the moment, installing a second fixing screw 55 into the first pressure balance spring seat 48, then connecting a pressure balance piston 49 provided with a third sealing element 46 with the first pressure balance spring seat 48 by using a second fixing screw 55, and finally filling the groove of the pressure balance piston 49 with high-temperature lubricating silicone grease, thereby completing the partial assembly of the pressure balance piston; 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 part into the pressure balance shell 52 and fixing the pressure balance piston part by using a first fixing screw 53; finally, the pressure balance part is in butt joint with the magnet shell 5; it should be noted that in the present embodiment, the pressure balance casing 52 is made of TC11 based on the principle of mechanical property and non-magnetism, and the stress concentration position is chamfered during the processing; the first pressure balance spring seat 48, the second pressure balance piston 49 and the second pressure balance spring seat 45 are made of beryllium bronze QBE2 according to the principles of mechanical property, non-magnetism and avoidance of excessive force seizure of the same material with the pressure balance shell 52; the spring 47 is made of 50CrVA.
The above-mentioned parts are installed together, only oiling seal mouth 4, oil outlet seal mouth 43 and overflow valve 56, then the opening pressure of overflow valve is adjusted to 5Mpa and is installed at magnet shell 5 again, secondly oiling seal mouth mounting hole and oil outlet seal mouth mounting hole connect the oil injection machine that circulates, the whole leakproofness of evacuation test instrument, annotate dimethyl silicon oil after the sealing performance does not have the problem, stop the oiling until pressure balance piston 49 reaches predetermined position, installation oiling seal mouth 4 and oil outlet seal mouth 43 accomplish the integral erection. It should be noted that the hardness of the selected sealing element in this embodiment is 80, the specific sealing dimension is selected according to the standard, silicone grease is required to be applied when the sealing ring is installed, and thread anti-seize paste is applied to all thread structures.
Preferably, in this embodiment, all the keys, the main magnet buffer block 19 and the screws are made of stainless steel 0Cr17Ni4CuNb, which satisfies the mechanical property and has no magnetic interference.
Preferably, the formulation of the high-temperature special preparation glue in the embodiment mainly comprises metal powder with shielding effect, connected high-temperature resin, curing agent and acrylate.
Preferably, the magnet designed by the finite element electromagnetic simulation method in this embodiment may be checked and adjusted by the magnet three-dimensional measuring instrument after the preparation is completed.
Preferably, in the embodiment, the materials of the tuning drill collar 1, the oil injection sealing 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 outlet sealing nozzle 43, the magnet housing 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 TC11; the soft magnetic buffer block I24 and the soft magnetic buffer block component 23 are made of high-temperature-resistant and nonmagnetic polytetrafluoroethylene; the materials of the short radio frequency shielding layer 25 and the radio frequency shielding layer 35 are selected to be C12000 with shielding performance; it should be noted that in the present embodiment, welding seams are left between the tuning drill collar 1 and the magnet housing 5, between the magnet housing 5 and the anti-wear sleeve 22, and between the magnet housing 5 and the pressure balance housing 52, and are finally welded and fixed; it should be noted that in this embodiment, the two main magnets are arranged in an N-level relative arrangement; the wear shell 28 material is selected from epoxy.
PreferablyThe stroke of the pressure balance piston 49 due to the thermal expansion of the silicone oil can be determined according to the temperature t of the liquid from the room temperature of 25 ℃ to the downhole environment of 175 DEG C 1 To t 2 The volume expansion amount of (a) is adjusted according to the need by the following formula:
V t2 ＝V t1 [1+β(t 2 -t 1 )]
wherein V t1 、V t2 A single liquid at a temperature t 1 And t 2 The volume of time;
beta-single liquid temperature from t 1 To t 2 Average volume expansion coefficient of (2).
B.2 nuclear magnetic resonance logging while drilling Probe calibration Process
The assembled probe is placed in a stratum simulator in an environment of shielding signals, then the assembled probe is connected with an existing logging-while-drilling electronic circuit, the electronic circuit is connected with a console computer, logging debugging software is started, the instrument is electrified to start testing gain, b1, measurement, noise, ringing, high voltage, direct current low voltage and the like, and if parameters which do not accord with logging requirements exist, various reasons are analyzed to debug the probe until all parameters accord with the requirements.
The docking process of the nuclear magnetic resonance logging while drilling probe structure provided by the invention and other underground instruments is as follows:
transporting the nuclear magnetic resonance logging while drilling probe which is loaded into the special box and transported to a destination, wherein NC tapered threads are arranged at two ends of the nuclear magnetic resonance logging while drilling probe, and the upper end of the nuclear magnetic resonance logging while drilling probe can be butted with an electronic circuit pup joint drill collar and a power generation device; the lower part is close to the drill bit position and is connected, and the torque of knot 3KN.m in the upper part, if meet special circumstances in the pit such as card brill can adopt fishing tool in the pit, can bear the impact load of pulling force 250T or jar ware etc..
In conclusion, the probe structure of the nuclear magnetic resonance logging-while-drilling instrument provided by the invention can be used for performing nuclear magnetic resonance logging while drilling with equipment such as a nuclear magnetic resonance-while-drilling electronic circuit, logging software, a generator while drilling and the like in a complex stratum environment during deep well, ultra-deep well or offshore drilling, has the functions of polarizing stratum fluid, providing a reasonable gradient magnetic field 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 conventional nuclear magnetic resonance logging-while-drilling scheme. The integral structure has good compatibility with the existing downhole drilling tool, and the nuclear magnetic resonance logging cost is reduced; and a solid foundation is laid for further researching an advanced nuclear magnetic resonance logging algorithm while drilling, a magnetic field structure, accurate knowledge of stratum information and the like.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related system fields are also included in the scope of the present invention.
Claims (10)
1. A nuclear magnetic resonance logging while drilling instrument probe structure is characterized in that:
comprises a first mandrel (15) and a second mandrel (40),
the first mandrel (15) and the second mandrel (40) are locked together by a mandrel bolt (38) and are in sealed connection;
the soft magnetic framework (31), the magnet fixing shaft (17), the mandrel centering block (14), the spring washer (54), the fixing nut (13), the locking nut I (11), the threading terminal fixing plate (8) and the locking nut II (10) are respectively and symmetrically arranged on the mandrel I (15) and the mandrel II (40) by taking the connection point as the center;
two soft magnetic frameworks (31) are symmetrically sleeved on the first mandrel (15) and the second mandrel (40), one ends of the two soft magnetic frameworks (31) are connected, the other ends of the two soft magnetic frameworks are respectively connected with a main magnet (20), a large pore channel in the soft magnetic frameworks (31) is connected with the first mandrel (15) through a transition cabin, a small pore channel is connected with the first mandrel (15) and the second mandrel (40), a step hole at the large end face is connected with a magnet fixing shaft (17), a large outer diameter step of the soft magnetic frameworks (31) is connected with a magnet shell (5) and is connected with an anti-abrasion sleeve (22) through guiding of a third key (29), and a short radio frequency shielding layer (25) and a radio frequency shielding layer (35) are installed on the small outer diameter step of the soft magnetic frameworks (31); a soft magnet (26) and a soft magnet buffer block I (24) are arranged outside the radio frequency shielding layer (35); a soft magnetic buffer block component (23) is arranged outside the short radio frequency shielding layer (25); the soft magnet (26) is sleeved outside the radio frequency shielding layer (35); the antenna part (27) is sleeved outside the soft magnet (26), and two ends of the antenna part are respectively connected with the anti-abrasion sleeve (22) in a sealing way; the anti-wear shell (28) is arranged outside the antenna part (27) and is fixedly connected with the anti-wear sleeve (22); the magnet fixing shafts (17) are symmetrically installed and are respectively sleeved on the mandrel I (15) and the mandrel II (40), the outer sides of the magnet fixing shafts are fixed with the main magnets (20), one ends of the main magnets are connected with the soft magnetic framework (31), and the other ends of the main magnets are provided with the main magnet buffer blocks (19); the main magnet buffer block (19) is fixed on the magnet fixing shaft (17) through a magnet fixing shaft nut (18); the relay fixing frame (33) is arranged on the mandrel I (15);
the two magnet shells (5) are symmetrically arranged, one end of each magnet shell is connected with the anti-abrasion sleeve (22), and the other end of each magnet shell is respectively connected with the pressure balancing device and the tuning device;
the tuning device comprises a tuning drill collar (1), and the pressure balancing device comprises a pressure balancing cabin (52);
a threading terminal (16) is arranged in the magnet shell (5); the pressure balance cabin (52) is connected with the magnet shell (5) in a sealing mode, the tuning drill collar (1) is arranged at the tail end of the first mandrel (15), and the pressure balance cabin (52) is arranged at the tail end of the second mandrel (40).
2. The nuclear magnetic resonance logging while drilling instrument probe structure of claim 1, wherein:
the novel tuning drill collar is characterized in that a slurry channel is arranged inside the first mandrel (15) and the second mandrel (40), the slurry channel is communicated with the slurry channel inside the tuning drill collar (1) and the slurry channel inside the pressure balance cabin (52) respectively, a transition cabin is arranged at the joint of the first mandrel (15) and the second mandrel (40), a pin sealing element (36) is arranged on the transition cabin, components can be additionally arranged at the later stage, a wire passing groove is arranged outside the transition cabin, a sealing platform stage and a thread platform stage are respectively machined on the first mandrel (15) and the second mandrel (40), and a sealing element seventh (37) is installed at the sealing platform stage.
3. The nuclear magnetic resonance logging while drilling instrument probe structure of claim 2, characterized in that:
the oil injection sealing nozzle (4) is installed on the tuning drill collar (1), the tuning cavity is symmetrically arranged, the tuning circuit board is installed inside the tuning cavity, and the tuning cabin cover (3) is installed on the tuning cavity.
4. The nuclear magnetic resonance while drilling tool probe structure of claim 3, wherein:
an oil filling hole is processed on the pressure balance shell (52) and used for installing an oil outlet sealing nozzle (43), a piston hole and a slurry channel are arranged in the pressure balance shell (52), a pressure balance piston (49), a spring (47), a pressure balance spring seat I (48) and a pressure balance spring seat II (45) are arranged in the piston hole,
the pressure balance spring seat II (45) is fixed in the piston hole, the pressure balance piston (49) is fixedly connected with the pressure balance spring seat I (48), the spring (47) is sleeved on the pressure balance spring seat I (48) and the pressure balance spring seat II (45), the spring (47) is respectively fixed on the steps of the pressure balance spring seat I (48) and the pressure balance spring seat II (45) through a pin, a sealing groove is formed in the pressure balance spring seat I (48), a sealing piece III (46) is installed in the sealing groove, and the pressure balance spring seat II (45) is fixed on the pressure balance shell (52) through a fixing screw I53;
the sealing plug (51) is used for sealing the piston hole, and a slurry channel is arranged on the sealing plug (51) and is connected with the slurry channel of the pressure balance shell (52).
5. The nuclear magnetic resonance while drilling tool probe structure of claim 4, wherein:
the relay fixing frame (33) is provided with relay mounting grooves which are uniformly distributed along the circumference.
6. The nuclear magnetic resonance logging while drilling instrument probe structure according to claim 5, characterized in that:
the anti-abrasion shell is characterized in that a threaded hole is formed in the anti-abrasion sleeve (22) and used for fixing the anti-abrasion shell (28), and a sealing groove is formed in the anti-abrasion sleeve (22) and used for mounting a sealing piece eight (30).
7. The nuclear magnetic resonance while drilling tool probe structure of claim 6, wherein:
a conical step is arranged in the magnet shell (5) and used for limiting the central block (14) of the mandrel; an overflow valve (56) is arranged on a piston hole of the magnet shell (5).
8. The nuclear magnetic resonance while drilling tool probe structure of claim 7, wherein:
threading terminal (16) all are equipped with corresponding through wires hole with threading terminal fixed plate (8), threading terminal (16) is last to have the keyway to be used for installing key seven (12).
9. The nuclear magnetic resonance logging while drilling instrument probe structure according to claim 8, wherein:
and a groove and a sealing groove are formed in the outer wall surface of the pressure balance piston (49), lubricating grease is filled in the groove, and a sealing element IV (46) is installed in the sealing groove.
10. The nuclear magnetic resonance while drilling tool probe structure of claim 9, wherein:
soft-magnetic buffer block subassembly (23) comprises three soft-magnetic buffer blocks, and the centre is worn with ordinary no magnetism pin and is even, there is the through wires hole on the soft-magnetic buffer block subassembly, this through wires hole communicates with each other with the through wires hole on soft-magnetic skeleton (31).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210992316.8A CN115467658A (en) | 2022-08-18 | 2022-08-18 | Probe structure of nuclear magnetic resonance logging instrument while drilling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210992316.8A CN115467658A (en) | 2022-08-18 | 2022-08-18 | Probe structure of nuclear magnetic resonance logging instrument while drilling |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116658154A (en) * | 2023-08-01 | 2023-08-29 | 河北赛维石油设备有限公司 | Driving nipple for wireless inclinometer while drilling |
| CN116950643A (en) * | 2023-09-19 | 2023-10-27 | 中海油田服务股份有限公司 | Circuit framework structure of logging while drilling instrument |
-
2022
- 2022-08-18 CN CN202210992316.8A patent/CN115467658A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116658154A (en) * | 2023-08-01 | 2023-08-29 | 河北赛维石油设备有限公司 | Driving nipple for wireless inclinometer while drilling |
| CN116658154B (en) * | 2023-08-01 | 2023-09-22 | 河北赛维石油设备有限公司 | Driving nipple for wireless inclinometer while drilling |
| CN116950643A (en) * | 2023-09-19 | 2023-10-27 | 中海油田服务股份有限公司 | Circuit framework structure of logging while drilling instrument |
| 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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