CN107288613A - It is a kind of to judge the method and device that downhole measurement adjusting instrument is reliably docked with injection well downhole flow regulator - Google Patents
It is a kind of to judge the method and device that downhole measurement adjusting instrument is reliably docked with injection well downhole flow regulator Download PDFInfo
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- CN107288613A CN107288613A CN201710509192.2A CN201710509192A CN107288613A CN 107288613 A CN107288613 A CN 107288613A CN 201710509192 A CN201710509192 A CN 201710509192A CN 107288613 A CN107288613 A CN 107288613A
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- 238000002347 injection Methods 0.000 title claims abstract description 68
- 239000007924 injection Substances 0.000 title claims abstract description 68
- 238000005259 measurement Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000003032 molecular docking Methods 0.000 claims abstract description 114
- 238000001514 detection method Methods 0.000 claims abstract description 55
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 230000005355 Hall effect Effects 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000007812 deficiency Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Measuring Volume Flow (AREA)
Abstract
Judge the method and device that downhole measurement adjusting instrument is reliably docked with injection well downhole flow regulator the invention discloses a kind of, the present invention is that one group of elasticity that can be by fulcrum of bearing pin docking pawl is installed on the support of downhole measurement adjusting instrument, pawl other end mounting magnetic steel is docked, and magnetic field detection component is installed with magnet steel correspondence position on support；Injection well downhole flow regulator be provided with docking groove, by dock pawl drive magnet steel produce radial displacement, magnetic field detection component detection to magnetic field intensity also change simultaneously；When the changes of magnetic field characteristic signal that magnetic field detection component detection to downhole measurement adjusting instrument is docked with the docking groove of injection well downhole flow regulator, you can confirm that downhole measurement adjusting instrument has reliably been docked with injection well downhole flow regulator, then injection well downhole flow regulator is adjusted again.The present invention solves the integrity problem of concentric well docking detection, overcomes the deficiencies in the prior art.
Description
Technical field
Judge the method and device that downhole measurement adjusting instrument is reliably docked with injection well downhole flow regulator the present invention relates to a kind of, belong to downhole instrument
Dock detection technique field.
Background technology
Current oil field generally uses water drive technology of reservoir sweep, and water drive well need to be using note of the downhole measurement adjusting instrument to each layer position injection well downhole flow regulator
Inbound traffics are adjusted.During regulation, downhole measurement adjusting instrument is first docked with injection well downhole flow regulator in tubular column of water well, and then injection well downhole flow regulator is adjusted again
Section, so as to control the water injection rate of this layer of position.How to judge whether measurement and adjustment instrument docks successfully with injection well downhole flow regulator, adjusted to being measured and tuned into work(and surveying
Efficiency is played an important role.Traditional docking determination methods are the axial movements by docking pawl or other parts on measurement and adjustment instrument
Docking signal is produced, so as to judge to have docked success.Traditional judgment mode has certain limitation, especially for concentric water filling
Well, measurement and adjustment instrument can also produce docking signal in oil pipe section hoop, packer etc., easily cause erroneous judgement.
The content of the invention
It is an object of the present invention to provide a kind of judge the method and device that downhole measurement adjusting instrument is reliably docked with injection well downhole flow regulator,
Judge that downhole measurement adjusting instrument docks successful reliability with injection well downhole flow regulator to improve, it is ensured that be measured and tuned into work(, improve to survey and adjust efficiency, so that gram
Take the deficiencies in the prior art.
The technical proposal of the invention is realized in this way：
The method that a kind of judgement downhole measurement adjusting instrument of the present invention is reliably docked with injection well downhole flow regulator, this method is the branch in downhole measurement adjusting instrument
It is the low double inclined surface structure in middle high both sides to be installed on frame on the outside of one group of docking pawl that can be by fulcrum of bearing pin, docking pawl,
Docking pawl on the inside of and support between spring is installed, while docking pawl other end mounting magnetic steel, and on support with magnet steel pair
Answer position that magnetic field detection component is installed；Injection well downhole flow regulator is provided with docking groove, when the docking groove of downhole measurement adjusting instrument and injection well downhole flow regulator is axially right
When connecing, the inclined-plane of the inner hole wall extruding docking pawl of injection well downhole flow regulator, makes docking pawl to contract before this, by dock pawl drive magnet steel to
Close to the direction displacement of magnetic field detection component, the magnetic field intensity enhancing that magnetic field detection component detection is arrived；When pair on downhole measurement adjusting instrument
Connect pawl to enter after docking groove, docking pawl is expanded outwardly under the action of the spring, make the magnet steel on docking pawl to away from magnetic field detection
The displacement of component direction, the changes of magnetic field characteristic signal that magnetic field detection component detection to measurement and adjustment instrument is docked with the docking groove of injection well downhole flow regulator
When, you can confirm that downhole measurement adjusting instrument has reliably been docked with injection well downhole flow regulator, then injection well downhole flow regulator is adjusted again；Or work as downhole measurement adjusting
The docking pawl of instrument enter injection well downhole flow regulator after be introduced into docking groove, now magnetic field detection component detection to changes of magnetic field characteristic signal be
It is strong after first weak to be always maintained at by force, being now also considered as downhole measurement adjusting instrument and reliably having docked with injection well downhole flow regulator, then again to injection well downhole flow regulator again
It is adjusted.
In preceding method, the magnetic field detection component includes linear hall-effect device and signal processing apparatus, linear Hall device
Part is used for the change of magnetic field strength for detecting magnet steel, and signal processing apparatus is reliable right for being filtered out from change of magnetic field strength signal
Connect signal.
In preceding method, stored in the signal processing apparatus for judging that the magnetic field intensity of reliable docking condition is preset
Value A and change of magnetic field strength time preset value t；Changed from weak to strong when detecting magnetic field intensity signal in time preset value t
It is reliable docking signal when dying down again；Or no longer become after magnetic field intensity signal changes from weak to strong when detecting, it is reliable right to be also considered as
Connect signal.
The device that a kind of judgement downhole measurement adjusting instrument of the invention built according to the above method is reliably docked with injection well downhole flow regulator, should
Device includes the injection well downhole flow regulator provided with docking groove, and downhole measurement adjusting instrument is provided with support, and support is uniformly distributed along the circumference through bearing pin and one group
Docking pawl one end is hinged, and is the low double inclined surface structure in middle high both sides on the outside of docking pawl, is installed on the inside of docking pawl between support
There is spring, the docking pawl other end is provided with magnet steel, and support corresponding with magnet steel position, which is provided with mounting seat, mounting seat, is provided with magnetic field
Detection components；One end that support has mounting seat is connected with connecting tube.
In aforementioned means, the magnetic field detection component includes linear hall-effect device and signal processing apparatus.
By adopting the above-described technical solution, the present invention is compared with prior art, the present invention is using magnet steel radial displacement
Method obtains docking signal, substitutes the axial movement in the prior art by docking pawl or other parts on measurement and adjustment instrument and is docked
Signal, can exclude the docking signal that measurement and adjustment instrument produces mistake in oil pipe section hoop, packer etc., so as to eliminate erroneous judgement, carry
The high successful reliability of docking.Efficiency is adjusted to play an important role to being measured and tuned into work(and surveying.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the detection method schematic diagram of the present invention.
In figure：1- connecting tubes, 2- magnetic field detections component, 3- mounting seats, 4- magnet steel, 5- docking pawl, 6- springs, 7- bearing pins,
8- supports, 9- injection well downhole flow regulators, 10- docking grooves, 11- downhole measurement adjusting instruments, 12- oil pipes.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples, but not as to any of the present invention
Limitation.
The method that a kind of judgement downhole measurement adjusting instrument of the present invention is reliably docked with injection well downhole flow regulator, as depicted in figs. 1 and 2：The party
Method is to install one group on the support 8 of downhole measurement adjusting instrument 11 to be on the outside of docking pawl 5 with docking pawl 5 of the bearing pin 7 for fulcrum
The low double inclined surface structure in middle high both sides, spring 6 is provided between the inner side of docking pawl 5 and support 8, while another in docking pawl 5
Mounting magnetic steel 4 is held, and magnetic field detection component 2 is installed with the correspondence position of magnet steel 4 on support 8；Injection well downhole flow regulator 9 is provided with docking groove
10, when downhole measurement adjusting instrument 11 is axially docked with the docking groove 10 of injection well downhole flow regulator 9, pawl 5 is docked in the inner hole wall extruding of injection well downhole flow regulator 9 before this
Inclined-plane, make docking pawl 5 to contract, magnet steel 4 driven to close to the direction displacement of magnetic field detection component 2, magnetic field by docking pawl 5
The magnetic field intensity enhancing that detection components 2 are detected；After the docking pawl 5 on downhole measurement adjusting instrument enters docking groove 10, docking pawl 5 exists
Expanded outwardly in the presence of spring 6, make the magnet steel 4 on docking pawl 5 to away from the direction displacement of magnetic field detection component 2, magnetic field detection
When component 2 detects the changes of magnetic field characteristic signal that measurement and adjustment instrument is docked with the docking groove 10 of injection well downhole flow regulator 9, you can confirm downhole measurement adjusting
Instrument 11 has reliably been docked with injection well downhole flow regulator 9, and then injection well downhole flow regulator 9 is adjusted again；Or another operating mode is, downhole measurement adjusting one
Docking pawl is introduced into docking groove after entering injection well downhole flow regulator, and the changes of magnetic field characteristic signal now detected is first weak rear strong another straight guarantor
Hold strong, be now also considered as downhole measurement adjusting instrument and reliably docked with injection well downhole flow regulator.Magnetic field detection component 2 include linear hall-effect device and
Signal processing apparatus, linear hall-effect device is used for the change of magnetic field strength for detecting magnet steel 4, and signal processing apparatus is used for strong from magnetic field
Reliable docking signal is filtered out in degree variable signal.The magnetic field for judging reliable docking condition is stored in signal processing apparatus
Intensity preset value A and change of magnetic field strength time preset value t；When detecting magnetic field intensity signal in time preset value t
Change from weak to strong when dying down again, be reliable docking signal；Or it is constant again after magnetic field intensity signal changes from weak to strong when detecting, also regard
For reliable docking signal.
The device that a kind of judgement downhole measurement adjusting instrument of the invention built according to the above method is reliably docked with injection well downhole flow regulator, such as
Shown in Fig. 1：The device includes the injection well downhole flow regulator 9 provided with docking groove 10, and downhole measurement adjusting instrument 11 is provided with support 8, and support 8 is through bearing pin 7
It is hinged with one end of pawl 5 of docking that one group is uniformly distributed along the circumference, the outside of docking pawl 5 is the low double inclined surface structure in middle high both sides, docking
Spring 6 is installed, docking pawl 5 other end is provided with magnet steel 4, support 8 corresponding with the position of magnet steel 4 between the inner side of pawl 5 and support 8
Provided with mounting seat 3, magnetic field detection component 2 is provided with mounting seat 13；One end that support 8 has mounting seat 3 is connected with connecting tube 1.Magnetic
Field detection components 2 include linear hall-effect device and signal processing apparatus.
Embodiment
This example equipment therefor is as shown in figure 1, including the injection well downhole flow regulator 9 provided with docking groove 10, downhole measurement adjusting instrument 11 is provided with branch
Frame 8, support 8 is hinged through bearing pin 7 with one end of pawl 5 of docking that one group is uniformly distributed along the circumference, and the outside of docking pawl 5 is low for middle high both sides
Double inclined surface structure, spring 6 is provided between docking pawl 5 inner side and support 8, when by heavy caliber enter the small-bore pipe period of the day from 11 p.m. to 1 a.m can with gram
Taking spring force makes docking pawl 5 smoothly enter small-bore pipeline by large diameter pipeline, and docking pawl 5 other end is provided with magnet steel 4, with magnet steel
The corresponding support 8 in 4 positions, which is provided with mounting seat 3, mounting seat 13, is provided with magnetic field detection component 2；Support 8 has the one of mounting seat 3
End is connected with connecting tube 1.Magnetic field detection component 2 includes linear hall-effect device and signal processing apparatus.
The course of work of this example is as follows：
The internal diameter of oil pipe is 62mm in this example, and the internal diameter of other downhole tools is all higher than 55mm, and the internal diameter of injection well downhole flow regulator is 46mm.When
Downhole measurement adjusting instrument 11 from internal diameter gone into the well for 62mm oil pipe 12 when, docking pawl 5 opening angle in the presence of spring 6 is maximum, right
The magnet steel of the end of pawl 5 is connect away from magnetic field detection component 2, therefore the magnetic field intensity that magnetic field detection component 2 is detected is minimum, works as underground
When measurement and adjustment instrument 11 continues to transfer, other downhole tools are can be potentially encountered, because the internal diameter of other downhole tools is all higher than 55mm, and
Opening angle less than the internal diameter 62mm of oil pipe 12, therefore docking pawl 5 can be less than the opening angle in oil pipe 12, magnetic field detection
The magnetic field intensity that component 2 is detected can also be more than magnetic field intensity in oil pipe 12, but magnetic field intensity now is still less than default
Magnetic field intensity A.When downhole measurement adjusting instrument 11, which continues to transfer, to be docked with the mouth of pipe of injection well downhole flow regulator 9, due to the spout diameter of injection well downhole flow regulator 9
The minimum become for 46mm, therefore docking pawl 5 opening angle, the magnetic field intensity that magnetic field detection component 2 is detected can exceed default
Magnetic field intensity A reach maximum, represent that downhole measurement adjusting instrument 11 is docked with injection well downhole flow regulator 9, enter water distribution when docking pawl 5
After the docking groove 10 of device 9, docking pawl 5 opens in the presence of spring 6, now, the magnetic field intensity that magnetic field detection component 2 is detected
It can diminish suddenly, less than default magnetic field intensity A, the magnetic field intensity that magnetic field detection component 2 is detected changes from weak to strong and set
The signal that the variation characteristic died down suddenly in t of fixing time reliably is docked as downhole measurement adjusting instrument 11 with injection well downhole flow regulator 9, confirms that underground is surveyed
Instrument 11 is adjusted reliably to be docked with injection well downhole flow regulator 9.Then injection well downhole flow regulator 9 can be adjusted by downhole measurement adjusting instrument 11；Or it is another
It is that the docking pawl of downhole measurement adjusting one is introduced into docking groove after entering injection well downhole flow regulator, the changes of magnetic field feature now detected to plant operating mode
Signal is always maintained at strong again to be strong after first weak, is now also considered as downhole measurement adjusting instrument and has reliably been docked with injection well downhole flow regulator.
The operation principle of this example is as shown in Figure 2：
When downhole measurement adjusting instrument 11 is not docked with injection well downhole flow regulator 9, docking pawl 5 should be located at oil pipe 12 or packer, oil pipe section hoop etc. its
In its downhole tool, now the docking opening angle of pawl 5 is larger, and from hall device farther out, magnetic field detection component 2 surveys letter to magnet steel 4
Number value be less than preset value A；When downhole measurement adjusting instrument 11 just starts to dock with injection well downhole flow regulator 9, docking pawl 5 should be located at before downhole measurement adjusting instrument 11
The pipe at end is also introduced into docking groove 10, now, and the docking opening angle of pawl 5 is all smaller always, and magnet steel 4 is from hall device very
Closely, to survey Field signal value most strong for magnetic field detection component 2, surveys magnetic field intensity signal and is persistently equal to or more than preset value A, according to
This magnetic field signal feature can determine whether that downhole measurement adjusting instrument 11 has begun to dock with injection well downhole flow regulator 9, but also it is undocked in place；When underground is surveyed
Instrument 11 is adjusted to continue into the very short time of downhole measurement adjusting instrument 11（This time t is very short, t<1 second）, effect of the docking pawl 5 in spring 6
Under open quickly, docking pawl 5 i.e. be caught in docking groove 10.Now, magnetic field detection component 2 surveys magnetic field signal for a changing value,
By quickly diminishing greatly.It can determine whether that docking pawl 5 has been caught in docking groove 10 according to this magnetic field signal feature, realize downhole measurement adjusting instrument
11 dock with the reliable of injection well downhole flow regulator 9；Or another operating mode is, the docking pawl of downhole measurement adjusting one is introduced into docking after entering injection well downhole flow regulator
Groove, the changes of magnetic field characteristic signal now detected for after first weak it is strong be always maintained at again it is strong, be now also considered as downhole measurement adjusting instrument with
Injection well downhole flow regulator is reliably docked.
This example has the characteristics that：
a）The program employs one group of docking pawl, docks the end face of pawl respectively equipped with a magnet steel；
b）Docking pawl is fixed using bearing pin, when caliber changes, and docking pawl is rotated around bearing pin, causes magnet steel Distribution of Magnetic Field to change, magnetic
Field detection components detected signal value also changes；
c）The program is become using tubing string caliber to be turned to dock basis for estimation.Dock pawl respectively in injection well downhole flow regulator, in oil pipe and its
When in its downhole tool, its opening angle is different, causes magnet steel Distribution of Magnetic Field also different；
d）Docking decision logic is：First, detected signal value is more than A values always, then dock；Second, detected signal value is first big
In A values, A values were then become smaller than in 1 second, then are reliably docked.Remaining situation is undocked；
e）A value determination methods are：Docking pawl is placed in injection well downhole flow regulator respectively（46mm internal diameters）, in oil pipe（62mm）With other wells
In lower instrument（≥55mm）, magnetic field detection component measured signal value is respectively x, y and z, then A values should meet condition：Y ＜ A ＜
x。
The present invention is detected available for the docking of existing downhole measurement adjusting instrument, is also applied for the docking inspection of other downhole instruments
Survey.
Claims (5)
1. a kind of judge the method that downhole measurement adjusting instrument is reliably docked with injection well downhole flow regulator, it is characterised in that：This method is in downhole measurement adjusting
Installed on the support of instrument on the outside of one group of docking pawl that can be by fulcrum of bearing pin, docking pawl as the low double inclined plane in middle high both sides
Structure, docking pawl on the inside of and support between spring is installed, while docking pawl other end mounting magnetic steel, and on support with magnetic
Steel correspondence position installs magnetic field detection component；Injection well downhole flow regulator is provided with docking groove, and fluted shaft is docked when downhole measurement adjusting instrument and injection well downhole flow regulator
To during docking, the inclined-plane of the inner hole wall extruding docking pawl of injection well downhole flow regulator, made docking pawl to contract, magnetic is driven by docking pawl before this
Steel is to close to the direction displacement of magnetic field detection component, and the magnetic field intensity that magnetic field detection component detection is arrived strengthens；When on downhole measurement adjusting instrument
Docking pawl enter after docking groove, docking pawl is expanded outwardly under the action of the spring, makes magnet steel on docking pawl to away from magnetic field
The displacement of detection components direction, the changes of magnetic field feature letter that magnetic field detection component detection to measurement and adjustment instrument is docked with the docking groove of injection well downhole flow regulator
Number when, you can confirm downhole measurement adjusting instrument reliably docked with injection well downhole flow regulator, then injection well downhole flow regulator is adjusted again；Or when underground is surveyed
The docking pawl of instrument is adjusted to be introduced into docking groove after entering injection well downhole flow regulator, the changes of magnetic field characteristic signal that now magnetic field detection component detection is arrived
It is always maintained at by force by force, being now also considered as downhole measurement adjusting instrument and reliably having docked with injection well downhole flow regulator, then again to water distribution again afterwards for elder generation is weak
Device is adjusted.
2. method according to claim 1, it is characterised in that：The magnetic field detection component includes linear hall-effect device and signal
Processing unit, linear hall-effect device is used for the change of magnetic field strength for detecting magnet steel, and signal processing apparatus is used to become from magnetic field intensity
Change and reliable docking signal is filtered out in signal.
3. method according to claim 1, it is characterised in that：The magnetic field detection component includes linear hall-effect device and letter
The magnetic field intensity preset value A for judging reliable docking condition and magnetic field are stored in number processing unit, signal processing apparatus
The time preset value t of Strength Changes；When detect magnetic field intensity signal changed from weak to strong in time preset value t die down again when, i.e.,
For reliable docking signal；Or no longer become after magnetic field intensity signal changes from weak to strong when detecting, it is also considered as reliably docking signal.
4. a kind of judgement downhole measurement adjusting instrument built according to claim 1-4 any claims methods described and injection well downhole flow regulator are reliable
The device of docking, it is characterised in that：Including provided with docking groove（10）Injection well downhole flow regulator（9）, downhole measurement adjusting instrument（11）It is provided with support
（8）, support（8）Through bearing pin（7）With one group be uniformly distributed along the circumference dock pawl（5）One end is hinged, and docks pawl（5）Outside is middle high
The low double inclined surface structure in both sides, docks pawl（5）Inner side and support（8）Between spring is installed（6）, dock pawl（5）The other end is set
There is magnet steel（4）, with magnet steel（4）The corresponding support in position（8）It is provided with mounting seat（3）, mounting seat（13）It is interior to be provided with magnetic field detection
Component（2）；Support（8）There is mounting seat（3）One end and connecting tube（1）Connection.
5. claim 4 described device, it is characterised in that：The magnetic field detection component（2）Including linear hall-effect device and signal
Processing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710509192.2A CN107288613A (en) | 2017-06-28 | 2017-06-28 | It is a kind of to judge the method and device that downhole measurement adjusting instrument is reliably docked with injection well downhole flow regulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710509192.2A CN107288613A (en) | 2017-06-28 | 2017-06-28 | It is a kind of to judge the method and device that downhole measurement adjusting instrument is reliably docked with injection well downhole flow regulator |
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|---|---|
| CN107288613A true CN107288613A (en) | 2017-10-24 |
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| CN201710509192.2A Pending CN107288613A (en) | 2017-06-28 | 2017-06-28 | It is a kind of to judge the method and device that downhole measurement adjusting instrument is reliably docked with injection well downhole flow regulator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973078A (en) * | 2019-03-26 | 2019-07-05 | 西华大学 | A kind of auxiliary MWD efficiently enters well tool |
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| CN205537499U (en) * | 2016-04-15 | 2016-08-31 | 贵州航天凯山石油仪器有限公司 | Absolute angle detecting means |
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| CN109973078A (en) * | 2019-03-26 | 2019-07-05 | 西华大学 | A kind of auxiliary MWD efficiently enters well tool |
| CN109973078B (en) * | 2019-03-26 | 2022-11-01 | 香港中文大学(深圳)城市地下空间及能源研究院 | Auxiliary MWD high-efficiency well entering tool |
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