WO2015042934A1 - 钻井辅助系统 - Google Patents
钻井辅助系统 Download PDFInfo
- Publication number
- WO2015042934A1 WO2015042934A1 PCT/CN2013/084680 CN2013084680W WO2015042934A1 WO 2015042934 A1 WO2015042934 A1 WO 2015042934A1 CN 2013084680 W CN2013084680 W CN 2013084680W WO 2015042934 A1 WO2015042934 A1 WO 2015042934A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- well
- assistance system
- drilling
- drilled
- existing
- Prior art date
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 73
- 230000005540 biological transmission Effects 0.000 claims abstract description 49
- 238000001514 detection method Methods 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims description 11
- 230000005684 electric field Effects 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 4
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims 1
- 238000009413 insulation Methods 0.000 abstract 2
- 238000005265 energy consumption Methods 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 18
- 230000005672 electromagnetic field Effects 0.000 description 7
- 230000001965 increasing effect Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- 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
- E21B47/02—Determining slope or direction
- E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
- E21B47/0228—Determining slope or direction of the borehole, e.g. using geomagnetism using electromagnetic energy or detectors therefor
-
- 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
- E21B47/02—Determining slope or direction
- E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
- E21B47/0228—Determining slope or direction of the borehole, e.g. using geomagnetism using electromagnetic energy or detectors therefor
- E21B47/0232—Determining slope or direction of the borehole, e.g. using geomagnetism using electromagnetic energy or detectors therefor at least one of the energy sources or one of the detectors being located on or above the ground surface
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/20—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with propagation of electric current
Definitions
- This invention relates to the field of drilling technology and, in particular, to a drilling assistance system. Background technique
- the Logging While Drilling of the oil industry generally refers to measuring the physical parameters of formation rocks during the drilling process, and uses the data telemetry system to send the measurement results to the ground for processing.
- drilling fluid pressure pulses such as mud pulse
- This is a commonly used method for logging while drilling tools. It converts the measured parameters into The drilling fluid pressure pulse is circulated to the surface with the drilling fluid.
- the advantage of drilling fluid pressure pulse transmission is economical and convenient.
- the disadvantage is that the data transmission rate (the number of data bits transmitted per second) is low.
- FIG. 1 shows a typical downhole electromagnetic transmission system of the prior art.
- An insulating ring 2 is disposed on the drill pipe 5 above the drill bit 4 to divide the drill pipe into upper and lower sections which are insulated from each other, and a low frequency power source 3 is loaded at both ends of the insulating ring.
- the formation (referring to the formation from the vicinity of both ends of the insulating ring 2 to the infinity) forms a loop with the power source.
- the line with arrows in the figure indicates the distribution of current at a certain moment in the formation.
- the thicker arrow indicates a larger current intensity
- the thinner arrow indicates a smaller current intensity
- the dotted arrow indicates the current intensity is stronger than the solid line.
- the current intensity of the arrow is even weaker.
- the currents at different times vary in size and direction, but the ratio of the current intensities between them is essentially constant. As shown in Fig.
- the current is stronger at the sub-circuit near the insulating ring 2, and the strength is smaller at the sub-circuit farther from the insulating ring 2, and when the well being drilled is deeper (for example, 2000 m or more) Well), through the sub-loop near the surface, the current is already very weak.
- the downhole data is loaded onto the power supply and transmitted to the surface by the electromagnetic field generated by the current.
- the ground end A of the casing of the well 1 being drilled is connected to a signal receiver 10, and the other end of the signal receiver 10 is connected to the infinity ground terminal B.
- the downhole data can be obtained.
- the electromagnetic signal passing through the sub-loop near the surface is very small, it requires high sensitivity to the signal receiver 10, and the data transmission rate is also very limited.
- the downhole casing that already exists in the vicinity.
- a receiving device is placed on the drill pipe of the well, which detects the electromagnetic field and determines the position of the existing well. This method detects a long distance, but the operation is complicated and the cost is high.
- Another technique is to place the transmitting power source (or transmitting device) and the receiving device on the drill pipe of the well being drilled.
- the transmitting power source (or transmitting device) generates an electromagnetic field in the formation that will exist in the existing well.
- An induced current is generated across the casing, which induces a secondary electromagnetic field in the formation that can be detected by the receiving device to determine the location of the existing well.
- Another object of the present invention is to overcome the deficiencies of the prior art and to provide a solution for downhole casing detection.
- the present invention provides a drilling assistance system that establishes a connection between multiple wells or between different branches of the same well.
- the electrical connection is a wire connection and/or a circuit connection.
- the casing of an already existing well is detected by establishing a connection between the well being drilled and the existing well.
- the casing for detecting other wells is the distance, orientation and orientation of the detection casing, or a combination of any one or both of the above.
- efficient data transmission is performed by establishing a connection between the well being drilled and an existing well, and the casing of the existing well is detected.
- detecting the casing of the existing well is detecting the casing distance, orientation and orientation, or a combination of any one or both of the above.
- the efficiency of data transmission from underground to the ground or drilling platform is improved by establishing connections between different branches of the same well.
- the casing that detects the presence of a branch is the distance, orientation and orientation of the probe casing, or a combination of any one or both of the above.
- the downhole to the ground or casing is improved by establishing a connection between different branches of the same well.
- 'Detect the tube that already has branches is the distance, orientation and direction of the probe casing, or any combination of the above or a combination of the two.
- the electrical connection is a circuit connection
- the circuit for electrical connection includes one or more power sources for enhancing current or voltage.
- the power source is a constant current power source or a constant voltage power source.
- the frequency of the power source is any frequency from direct current to low frequency to high frequency.
- the electrical connection is a circuit connection, and the circuit for electrical connection includes a current or voltage amplifier for boosting current or voltage.
- the drilling assistance system further comprises a signal receiver for receiving a loop formed between the well being drilled and the well already existing.
- the signal receiver is placed on the surface, the circuit between the well or the well; or near any location around the well.
- the signal receivers are connected in parallel or in series in an existing circuit, or placed in the vicinity of an existing circuit.
- the signal detected by the signal receiver is a current, a voltage, an electric field, a magnetic field or other electrical signals.
- the drilling assistance system further comprises a transmitting device, wherein the downhole measurement signal is loaded into a voltage, a current, an electric field or a magnetic field generated by the transmitting device, and is transmitted to a loop formed between the well being drilled and the existing well The signal receiver.
- the transmitting device is a power source.
- the power source is a low frequency to high frequency power source or a direct current power source.
- the power source is located in a loop formed between the well being drilled and the existing well or between different branches of the same well.
- the power source is located underground.
- the well is an oil-based mud drilling
- the launching device is located in a circuit between the surface, the drilling platform or the drilling well, and has a signal loading device underground.
- a separate or simultaneous connection is established between the well being drilled and the existing wells.
- it also includes a casing positioning detector installed under the well.
- the casing positioning detector performs casing positioning based on signals in the loop formed between the well being drilled and the existing well.
- the signal detected by the casing positioning detector includes a magnetic field, an electric field, a current, a voltage, or other electrical signals.
- the casing positioning detector is mounted on the drill pipe above or below the downhole launching device or on the insulating ring.
- the transmitting device is a power source.
- the transmitting power source is a low frequency to high frequency power source or a direct current power source.
- the transmitting power source is located in a loop formed between the well being drilled and the existing well or between different branches of the same well.
- the transmitting power source is located underground.
- the well is an oil based base drilling
- the launching device being located in a circuit between the surface, the drilling platform or the well.
- the present invention also provides a detection method based on the above-described drilling assistance system, wherein when there are multiple existing wells around the well being drilled, a connection is established between the well being drilled and the existing wells, For any of the existing wells, based on the established relationship between the well being drilled and the existing well, the casing positioning detector is used to detect the casing detection of the existing well.
- the present invention also provides another detection method based on the above-mentioned drilling assistance system.
- the well group information derives the distance, direction and direction of the well being drilled from the newly established well; this is repeated until the casing detection of all existing wells around the well being drilled is completed.
- the present invention has the following technical effects:
- the invention When the invention is applied to electromagnetic data transmission, it can greatly reduce useless power consumption in the formation, thereby effectively improving the efficiency of underground electromagnetic data transmission.
- Figure 1 shows a typical downhole electromagnetic transmission system of the prior art
- Figure 2 illustrates a downhole electromagnetic data transmission system in accordance with one embodiment of the present invention
- Figure 3 illustrates a downhole electromagnetic data transmission system in accordance with another embodiment of the present invention
- Figure 4 shows a downhole electromagnetic data transmission system in accordance with yet another embodiment of the present invention.
- FIG. 5 illustrates an existing well detection system in accordance with one embodiment of the present invention
- Figure 6 shows an existing well detection system in accordance with another embodiment of the present invention.
- Figure 7 illustrates an integrated logging system capable of simultaneously performing downhole electromagnetic data transmission and casing exploration in accordance with one embodiment of the present invention
- Figure 8 illustrates a system capable of simultaneous electromagnetic data transmission and casing detection in accordance with yet another embodiment of the present invention
- Figure 9 illustrates a system capable of simultaneous electromagnetic data transmission and casing detection in accordance with yet another embodiment of the present invention.
- Figure 10 is a schematic view showing current distribution of an example of the present invention.
- Figure 11 illustrates a downhole electromagnetic data transmission system suitable for oil-based mud drilling in accordance with one embodiment of the present invention
- Figure 12 illustrates a downhole casing detection system suitable for oil-based mud drilling in accordance with one embodiment of the present invention
- Figure 13 illustrates simultaneous downhole data transmission and casing for oil-based mud drilling in accordance with one embodiment of the present invention.
- Integrated System for Detection Figure 15 illustrates an integrated system for downhole casing detection systems suitable for downhole branching; transmission and casing detection in accordance with one embodiment of the present invention.
- FIG. 2 illustrates a downhole electromagnetic data transmission system that enhances downhole to ground (or rig) data transmission by establishing a connection between a well being drilled and an existing well. effectiveness.
- an insulating ring 2 is placed on the drill pipe 5, and both ends of the insulating ring 2 are connected by a transmitting power source 3.
- a transmitting power source 3 At the wellhead end A of the casing 7 of the well 1 being drilled
- the wellhead end B of the existing casing 6 of the well 6 is connected by wires, and the signal receiver 10 is connected in series with the wires.
- the transmitting power source 3 the drill pipe 5 of the well 1 being drilled, the casing 7 of the well 1 being drilled (the casing is usually a conductor), the wire between the two wells, the casing 8 of the already existing well 6, And the formation between the two wells constitutes a large loop, which has less energy dissipation in the formation, so it can be used for efficient data transmission efficiency.
- the signal receiver 10 is connected in series in the loop, so data reception can be achieved by detecting the current.
- Figure 3 illustrates another downhole electromagnetic data transmission system.
- the embodiment of Figure 3 is similar to the embodiment of Figure 2, and therefore the same reference numerals identify the same components, the difference being that the one end of the signal receiver 10 of Figure 3 is connected to point A in the loop (not limited to point A;), One end is placed far enough to measure the voltage from point A to a far enough distance for data transmission.
- Figure 4 illustrates a downhole electromagnetic data transmission system in accordance with yet another embodiment of the present invention.
- the embodiment of Figure 4 is similar to the embodiment of Figure 2, and therefore the same reference numerals identify the same components, except that the signal receiver 10 is placed near a large loop formed by two wells for data transmission by measuring electromagnetic field signals.
- Figure 5 illustrates an existing well detection system of one embodiment of the present invention that enables the detection of the location of other wells from the well being drilled 1 by establishing a connection between the well being drilled 1 and the existing well 6 Orientation and direction.
- the drill pipe 5 in the well 1 being drilled, the drill pipe 5 is provided with an insulating ring 2 and connected by a transmitting power source 3.
- a wire is connected between the casing 7 of the well being drilled and the casing 8 of the existing well.
- the casing detecting device 11 of Fig. 5 is placed on a drill pipe above the transmitting power source 3, which can realize the positioning of the casing 8 of the existing well by detecting the surrounding magnetic field.
- the casing detecting device 11 of the present invention is not limited to detecting a magnetic field, which is easily understood by those skilled in the art.
- Figure 6 shows another embodiment of a scheme for detecting existing wells in the vicinity.
- the embodiment of Figure 6 is similar to the embodiment of Figure 5, and therefore the same reference numerals identify the same components.
- the difference between the Figure 6 embodiment and the Figure 5 embodiment is that the casing detecting device 11 is placed on the drill pipe below the launch power source 3.
- the direction of the casing of an existing well can be detected by measuring the direction of the electric field.
- the casing detecting device 11 of the present invention is not limited to detecting an electric field, which is easily understood by those skilled in the art.
- Figure 7 illustrates an embodiment of an integrated logging system capable of simultaneously performing downhole electromagnetic data transmission and casing detection in accordance with an embodiment of the present invention.
- This embodiment passes through the well 1 being drilled and already stored A relationship is established between the wells 6 to simultaneously achieve downhole data transmission and casing detection of existing wells.
- the well 1 being drilled is connected to the existing well 6 by wires, but in other embodiments, complicated circuits or other connections may be used.
- the signal detector 10 and the casing detecting device 11 are simultaneously placed in the same system, and data transmission and casing measurement tasks can be performed simultaneously.
- the position of the signal detector 10 and the casing detecting device 11 is not limited to the position shown in Fig. 7, and they can be placed at other positions of the logging system, such as the positions shown in Figs. 3, 4, and 6.
- Fig. 8 shows another embodiment of the system of the present invention capable of simultaneous electromagnetic data transmission and casing detection.
- the embodiment of Fig. 8 is similar to the embodiment of Fig. 7, and therefore the same reference numerals are used to identify the same components and will not be described again.
- the difference between Fig. 8 and Fig. 7 is that an auxiliary power source 12 is added to the system of Fig. 8.
- This auxiliary power supply can help the system to better perform data transmission and casing detection.
- the auxiliary power source can also be added to the embodiments shown in Figures 2, 3, 4, 5, 6, and 7, respectively.
- Fig. 9 shows another embodiment of the system of the present invention capable of simultaneous electromagnetic data transmission and casing detection.
- the embodiment of Figure 9 is to establish a connection between the two offshore platforms through circuitry.
- the connection circuit for establishing the connection can be placed on the sea floor, and the signal receiver 10 can be placed on the offshore platform above the sea surface 13, or placed on the sea floor 14 as shown in FIG.
- Fig. 10 is a view showing a current distribution of an example of the present invention.
- the circuit between the well being drilled and the existing well is connected by a single wire for the sake of convenience.
- complex circuit connections can be used to enhance the frequency of the underground power transmission and increase the intensity of the current in the loop, thereby achieving better signal transmission and measurement results. If there are multiple wells around the well being drilled, you can also connect them simultaneously or in time to get better results.
- the power supply shown in the figure can be DC, low frequency AC to high frequency power.
- the figure shows that the current of the transmitting power supply has two loops.
- the first loop is the current flowing from the upper end of the transmitting power source, through the drill pipe, the ground wire, the casing of the existing well, the ground layer, the drill pipe under the transmitting power, and the power return.
- the loop is formed;
- the second loop is the current flowing from the upper end of the transmitting power source, through the drill pipe, the ground layer, the drill pipe under the transmitting power source, and the power is returned to form a loop. Since the electrical energy in the first loop is mainly consumed in the well below the existing well and the stratum between the drill pipe (and the drill bit) under the power supply, and because the existing well is not far from the well being drilled, , so the current in this loop is large enough.
- Figure 11 illustrates an embodiment of a downhole electromagnetic data transmission system suitable for oil-based mud drilling of the present invention. Due to the high electrical resistivity of the oil-based mud, it is difficult for current to flow outward from the well wall being drilled. Therefore, most of the current will flow through the casing 7 of the well being drilled, the drill pipe 5, through the drill bit 4, through the formation and into the casing 8 of the existing well, and then through the casing 8 of the existing well to the ground, Go back to power supply 3 to form a large loop. This power supply 3 can be placed near the surface. This allows for faster downhole data transfer rates by increasing current and voltage.
- the downhole data loading can be accomplished by a signal loading device 15 mounted on the drill pipe 5, which is received by the signal receiver 10 at the surface.
- the signal loading device 15 can be a controller of current or voltage.
- Figure 12 illustrates an embodiment of a downhole casing detection system suitable for oil-based mud drilling of the present invention. Due to the high electrical resistivity of the oil-based mud, it is difficult for the current to flow outward from the well wall being drilled. So most of the current will flow through the casing 7 of the well being drilled, the drill pipe 5, through the drill bit 4, through the formation and into the casing 8 of the existing well, and then up to the ground, back to the power supply 3, thus forming a Big loop. This power supply 3 can be placed near the surface. Thus, when the casing is probed by the casing detecting device 11 mounted on the drill pipe 5, the current (or voltage) of the power source 3 can be increased to reach a farther casing to detect the effective distance.
- Figure 13 illustrates an embodiment of an integrated system for downhole data transfer and casing detection for oil-based mud drilling of the present invention.
- the embodiment of Fig. 13 is similar to the embodiment of Fig. 11, and therefore the same reference numerals are used to identify the same components and will not be described again.
- the difference between the embodiment of Fig. 13 and the embodiment of Fig. 11 is that the drill pipe 5 is also provided with a casing detecting device 11 .
- the power supply can be placed near the surface so that the current (or voltage) of the power supply can be increased while achieving faster data transfer rates and longer casing detection effective distances.
- the system establishes a link 8 between different branches of the same well, thereby effectively improving the efficiency of underground data transmission.
- the signal receiver 10 of the system is placed on the ground surface, and one end thereof is connected by a wire (such as a wire) between different branches, and the signal is received.
- the other end of the device 10 is connected to the infinity ground terminal 9.
- the signal receiver 10 can receive the data of the downhole branch by detecting the voltage between the different branches (such as wires) to the voltage between the infinite ground terminals 9.
- the transmitting power source 3 the drill pipe 5 of the branch 16 being drilled, the casing 17 of the branch being drilled (the casing is usually a conductor), the wire between the two downhole branches, the branch casing of the existing downhole branch 18 19, and the formation between the two downhole branches constitutes a large loop, the energy dissipation of the loop in the formation is small, and the signal receiver 10 connects the wires between the two downhole branches, and the data of the downhole branch can be efficiently received. .
- Figure 15 illustrates an embodiment of the present invention suitable for a downhole casing detection system having a downhole branch.
- the system establishes a connection between different branches of the same well, effectively binning the complexity of casing detection.
- the embodiment of Fig. 15 is similar to the embodiment of Fig. 14, and therefore the same reference numerals are used to identify the same components and will not be described again. The only difference is that the receiving device for the downhole data transmission on the ground in Fig. 15 is being drilled.
- a detection device for detecting a sleeve of an existing branch is added to the branched drill pipe.
- the system establishes a connection between different branches of the same well, thereby simultaneously achieving downhole data transmission and casing positioning of existing branches.
- the embodiment of Fig. 16 is similar to the embodiment of Fig. 14, and therefore the same reference numerals are used to identify the same components and will not be described again. The only difference is that the detection of the casing for detecting the existing branches is added to the drill pipe of the branch being drilled. Device.
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/026,032 US10648324B2 (en) | 2013-09-30 | 2013-09-30 | Auxiliary system for use in drilling |
CA2926612A CA2926612A1 (en) | 2013-09-30 | 2013-09-30 | A drilling auxiliary system |
EP13894763.5A EP3054084A4 (en) | 2013-09-30 | 2013-09-30 | Auxiliary system for use in drilling |
PCT/CN2013/084680 WO2015042934A1 (zh) | 2013-09-30 | 2013-09-30 | 钻井辅助系统 |
CN201380079972.8A CN105874163B (zh) | 2013-09-30 | 2013-09-30 | 钻井辅助系统 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CN2013/084680 WO2015042934A1 (zh) | 2013-09-30 | 2013-09-30 | 钻井辅助系统 |
Publications (1)
Publication Number | Publication Date |
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WO2015042934A1 true WO2015042934A1 (zh) | 2015-04-02 |
Family
ID=52741863
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/CN2013/084680 WO2015042934A1 (zh) | 2013-09-30 | 2013-09-30 | 钻井辅助系统 |
Country Status (5)
Country | Link |
---|---|
US (1) | US10648324B2 (zh) |
EP (1) | EP3054084A4 (zh) |
CN (1) | CN105874163B (zh) |
CA (1) | CA2926612A1 (zh) |
WO (1) | WO2015042934A1 (zh) |
Cited By (1)
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CN111396035A (zh) * | 2020-03-04 | 2020-07-10 | 中国地质大学(武汉) | 基于电磁随钻测量信号识别煤层与围岩界面及电阻率方法 |
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CA3019471C (en) * | 2016-05-06 | 2021-01-12 | Halliburton Energy Services, Inc. | Ranging and resistivity evaluation using current signals |
CN107989601B (zh) * | 2017-12-22 | 2020-12-15 | 西安石油大学 | 一种用于同时钻多口垂直井的磁测距方法 |
US10760414B1 (en) * | 2019-07-12 | 2020-09-01 | Isodrill, Inc. | Data transmission system |
GB2593125A (en) * | 2019-08-26 | 2021-09-22 | Fraserv Ltd | Method and apparatus |
CA3180585A1 (en) | 2020-06-10 | 2021-12-16 | Yuliy Aleksandrovich DASHEVSKIY | Active magnetic ranging by wellhead current injection |
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Also Published As
Publication number | Publication date |
---|---|
CN105874163B (zh) | 2019-12-31 |
CA2926612A1 (en) | 2015-04-02 |
EP3054084A1 (en) | 2016-08-10 |
US20160230544A1 (en) | 2016-08-11 |
EP3054084A4 (en) | 2017-05-10 |
US10648324B2 (en) | 2020-05-12 |
CN105874163A (zh) | 2016-08-17 |
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