CN105089651B - LWD resistivity log device and measurement method - Google Patents
LWD resistivity log device and measurement method Download PDFInfo
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- CN105089651B CN105089651B CN201410190525.6A CN201410190525A CN105089651B CN 105089651 B CN105089651 B CN 105089651B CN 201410190525 A CN201410190525 A CN 201410190525A CN 105089651 B CN105089651 B CN 105089651B
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Abstract
The invention discloses a kind of LWD resistivity log device and measurement methods comprising: first antenna and match circuit；Transmitting module is measured, is connect with the first antenna and match circuit；Second antenna and match circuit；Receiving module is measured, is connect with second antenna and match circuit；Wherein, the measurement transmitting module is mounted in the first part of power drilling tool, and the measurement receiving module is mounted on the second part of the power drilling tool far from the measurement transmitting module.LWD resistivity log device of the invention adopts a split structure design, it is separately mounted to the both ends of mud motor, the distance between transmitting antenna and receiving antenna is effectively increased on the basis of guaranteeing receiving antenna as close to drill bit, it ensure that the accurate directive function that measured resistance parameter adjusts wellbore trace, increase the investigation depth of resistivity.
Description
Technical field
The present invention relates to petroleum drilling engineering field, a kind of LWD resistivity log device and measurement side are in particulard relate to
Method is more specifically related to a kind of resistivity test device and measurement method using electromagnetic wave.
Background technique
With the continuous development of the rapid growth and horizontal well technology of offshore drilling, the application of logging while drilling technology is also got over
Come more extensive.The main distinction of well logging and Regular wireline be its data acquisition real-time, formation data be
What drilling fluid obtained in the case where having slight invasion, thus closer undisturbed formation.Formation data is completed while drilling well
It tests, be transferred to ground, field assay, explanation, not only saved drilling period, and drilling well can be instructed, adjust drilling well rail
Mark improves drilling course.
Resistivity is the major parameter for reflecting formation characteristics, and the measurement of resistivity logging while drilling is the key that well logging composition portion
Point.Judge that formation characteristics changes by the resistivity on stratum near measurement drill bit, by comprehensive analysis, can judge to bore in time
Whether head drills out reservoir, to adjust well track in time, it is ensured that wellbore, which is accurately hit reservoir and navigated in reservoir, to be conducive to
The optimum position of oil-gas mining.
According to the measuring principle of resistivity, i.e. the investigation depth of resistivity has at a distance from transmitting antenna to receiving antenna
Direct relationship, the distance of transmitting antenna to receiving antenna is longer, and investigation depth is deeper.Therefore, to guarantee certain precision, according to
The resistivity measurement instrument length that prior art design is realized is above 3 meters.And the length of power drilling tool has generally been above 5
Rice, there are also 1 meter of spaces between drill bit and power drilling tool.This finally will lead to the aerial position distance of resistivity measurement instrument
Drill bit is at 8 meters or more.Since most oilfields exploitation all enters middle and advanced stage, oil reservoir is all relatively thin, is not achieved 8 meters or more.Therefore exist
When in face of compared with oil sheet, it will become to be stranded very much to adjust wellbore trace using the parameter that the measuring device of the above-mentioned prior art obtains
It is difficult.
In the prior art there are also a kind of measuring device, nearly drill bit is mounted in power drilling tool to the very short space of drill bit
Face.But since space limits, the length of this quasi-instrument is very short, usually less than 1 meter.In addition, common resistivity measurement instrument
It can not be mounted on power drilling tool lower end, to know that transmitting antenna is just smaller to the distance of receiving antenna.According to above-mentioned principle, this
The measurement result that will eventually lead to nearly bit resistivity measuring instrument is very inaccurate.
Further, since drilling fluid can invade stratum when drilling well, if the investigation depth of resistivity not enough depth,
The stratum of measurement is mainly the stratum that mud filtrate invasion occurs, not up to undisturbed formation.Such measurement result and true knot
Fruit there are relatively large deviation, also have a greatly reduced quality by the value that guidance adjusts wellbore trace.
Therefore, it is necessary to one kind can take into account measurement point to the distance of drill bit and take into account investigation depth with brill electromagnetic wave
Resistivity test device and method.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of LWD resistivity log devices comprising
First antenna and match circuit；
Transmitting module is measured, is connect with the first antenna and match circuit, to be recycled according to preset measurement
The electromagnetic wave of order and predetermined band is initiated in periodic emission measurement；
Second antenna and match circuit；
Measure receiving module, connect with second antenna and match circuit, to according to the measuring command in difference
The reflection of electromagnetic wave signal carried on the predetermined band for reflecting formation resistivity information reflected through stratum is received on path,
And the reflection signal in the different paths is handled so that it is determined that the measurement transmitting module is to the measurement receiving module
Between formation resistivity；
Wherein, the measurement transmitting module is mounted in the first part of power drilling tool, and the measurement receiving module is separate
The measurement transmitting module is mounted on the second part of the power drilling tool.
In one embodiment, the first part for being equipped with the measurement transmitting module forms the first of the power drilling tool
Pipe nipple is located at the top of the power drilling tool, and the second part for being equipped with the measurement receiving module forms the power drill
Second pipe nipple of tool, is located at the lower section of the power drilling tool.
In one embodiment, second pipe nipple is located proximate to drill bit.
In one embodiment, the antenna in second antenna and match circuit is arranged in pairs, symmetrically to receive
Reflection of electromagnetic wave signal on different paths.
In one embodiment, the antenna in the first antenna and match circuit and the second antenna and match circuit uses
Double receive of four hairs is arranged in pairs, and is motivated away from a manner of by bifrequency, double source to obtain four investigation depths radially
Resistivity information.
In one embodiment, the measurement transmitting module further include:
First radio digital communication unit, to send digital signal, the hair of the digital signal to measurement receiving module
It rises related with preset measurement cycle period or measurement frequency；
Electromagnetic wave measurement transmitting unit, to emit electromagnetic wave measurement signal according to preset measurement frequency, wherein
The power of the measuring signal is greater than the power of the digital signal.
In one embodiment, the measurement receiving module includes:
Second radio digital communication unit receives the digital signal sent from the measurement transmitting module；
Whether decoding unit is decoded received digital signal, include wherein that instruction is initiated in measurement to identify；
Amplifying unit is acquired, is used in the case where identification has measurement to initiate instruction to from the second antenna and matching electricity
Reflection of electromagnetic wave signal on each path on road is acquired enhanced processing；
Computing unit, the phase difference for being used to calculate between the amplified reflection signal on different paths and amplitude
Than so that it is determined that the transmitting module that measures is to the formation resistivity between the measurement receiving module.
In one embodiment, the first multiplexer is connected in the first antenna and match circuit, different
Moment the first antenna is coupled with the first radio digital communication unit or the electromagnetic wave measurement transmitting unit to
It realizes time-sharing multiplex of the antenna in measurement transmitting module, it is multiple that second is connected on second antenna and match circuit
With device, second multiplexer at different times by second antenna and the second radio digital communication unit or
The acquisition amplifying unit coupling is to realize time-sharing multiplex of the antenna in measurement receiving module.
In one embodiment, the clock source of the measurement receiving module and the measurement transmitting module uses temperature-compensating
Crystal oscillating circuit.
A method of resistivity measurement is carried out using such as above-mentioned LWD resistivity log device, comprising the following steps:
Parameter based on power drilling tool is pre-configured with measurement receiving module and survey in the LWD resistivity log device
The measurement parameter of transmitting module is measured, wherein the measurement parameter includes measurement frequency or measurement cycle period；
Measurement transmitting module sends predetermined band with different capacity under the measurement frequency or in measurement cycle period
Order is initiated in electromagnetic wave and measurement, and the measurement that wherein power of the electromagnetic wave signal of measured resistivity is greater than the communication is sent out
Play the power of order；
In the case where receiving the measurement initiation order, the measurement receiving module enters measuring state, in difference
The reflection of electromagnetic wave signal carried on the predetermined band for reflecting formation resistivity information reflected through stratum is received on path,
And the reflection signal in the different paths is handled so that it is determined that the measurement transmitting module is to the measurement receiving module
Between formation resistivity；
In the case where not receiving the measurement initiation order, the measurement receiving module is in standby.
Compared with prior art, the beneficial effects of the present invention are:
LWD resistivity log device of the invention adopts a split structure design, so that emitting portion and receiving portion can
To be separately mounted to the both ends of mud motor, this effectively increases transmitting antenna in measuring device and receiving antenna it
Between distance, increase the investigation depth of resistivity.
Simultaneously because one of receiving portion or emitting portion are arranged close to the position of drill bit, it can for thin reservoir
To accomplish that measurement point is positioned as close to drill bit, thus the distance length with shorter measurement point to drill bit, therefore ensure that
The accurate directive function that measured resistance parameter adjusts wellbore trace.
In addition, measurement method according to the present invention is receiving receiving portion not in a measurement cycle period
To being in standby when measuring initiation command, so that measuring device power consumption according to the present invention is very low, therefore according to the present invention
Measuring device have longer service life.
It on the other hand, is the synchronism for guaranteeing separately independently installed emitting portion and receiving portion, in respective circuit
Clock source use temperature-compensating crystal oscillator, the consistency of clock when guaranteeing temperature change.
Other features and advantages of the present invention will be illustrated in the following description, and partly becomes from specification
It is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by wanting in specification, right
Specifically noted structure is sought in book and attached drawing to be achieved and obtained.
Detailed description of the invention
Attached drawing is used to provide more detailed description to the present invention, and without limitation.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of LWD resistivity log device according to an embodiment of the present invention；
Fig. 2 be LWD resistivity log device according to an embodiment of the present invention in conjunction with power drilling tool after reception pipe nipple and
Emit the structural schematic diagram of pipe nipple；
Fig. 3 is the structure chart that LWD resistivity log device according to an embodiment of the present invention is mounted on power drilling tool；
Fig. 4 is the flow chart of the LWD resistivity log method of embodiment according to the present invention.
Specific embodiment
Carry out the embodiment that the present invention will be described in detail below with reference to attached drawing, whereby to the present invention how applied technology method
Technical problem is solved, and the realization process for reaching technical effect can fully understand and implement.As long as it should be noted that
Conflict is not constituted, and each feature in various embodiments of the present invention and each embodiment can be combined with each other, and be formed by technical side
Case is within the scope of the present invention.
The length of conventional LWD resistivity log device is generally above 3m, due between power drilling tool and drill bit away from
From general no more than 1m, therefore it is all installed on the upper end of the power drilling tool in underground substantially.Assuming that LWD resistivity log
Device and then install by power drilling tool, then the distance of the antenna distance drill bit on LWD resistivity log device are as follows: antenna arrives
The sum of the length of power drilling tool, the length of power drilling tool and nearly bit tool length.Wherein, length of the antenna to power drilling tool
Generally 0.5m-2m, the length of power drilling tool are generally 5m-10m, and the length of nearly bit tool is 1m or so.Therefore, though
And then under conditions of power drilling tool installation is with electromagnetic resistivity apparatus is bored, the distance of antenna distance measurement point is also in 6.5m-
13m.In this way, when oil reservoir is relatively thin, due to measuring tool apart from drill bit too far, it is extremely difficult to adjust wellbore trace.
In another LWD resistivity log device, in order to which the antenna that furthers is to the distance of drill bit, resistivity logging while drilling is surveyed
Amount device is mounted on power drilling tool lower end.But since the distance of power drilling tool to drill bit is no more than 1m, it is such with boring electricity
The distance between transmitting antenna and receiving antenna of the electromagnetic resistivity of resistance rate measuring device are also no more than 1m.Due to resistivity
It fathoms directly related with the distance between transmitting antenna and receiving antenna, distance is bigger, fathoms deeper, therefore such
The resistivity measurement depth of LWD resistivity log device is extremely limited.
For the deficiency of the above existing LWD resistivity log device, as shown in Figure 1, according to an embodiment of the present invention with brill
Resistivity test device is divided into relatively independent 120 two parts of emitting portion 110 and receiving portion.This two parts is installed respectively
Receiving portion 120 at the both ends of power drilling tool, and device is arranged close to one end of drill bit.This mounting means is both effectively
It increases with the distance between power drilling tool electromagnetic wave resistivity survey apparatus receiving antenna and transmitting antenna, also meets reception day
The requirement that the distance of line to drill bit must not be too far away.To in the essence for guaranteeing that measured resistance parameter adjusts wellbore trace
The investigation depth of resistivity is increased while true directive function.
The emitting portion 110 of device includes antenna 111 and antenna-matching circuit 112, multiplexer 113, measurement transmitting module
114。
It measures transmitting module 114 and is used to the electromagnetic wave that emission measurement initiates order or predetermined band.Measure transmitting module 114
The electromagnetic wave of order or predetermined band can be initiated according to preset measurement cycle period emission measurement.It includes no line number
Word communication unit 115 and electromagnetic wave measurement transmitting unit 116.
Radio digital communication unit 115, to send digital signal 150 to receiving portion 120.The hair of digital signal 150
It send related with preset measurement cycle period or measurement frequency.In each measurement cycle period, radio digital communication list
Member 115, which is sent, initiates the digital signal 150 of order to notify receiving portion 120 to enter measuring state or transmission comprising measurement
The digital signal 150 of order is initiated to notify receiving portion 120 to enter standby mode not comprising measurement.
In each measurement cycle period, the number ordered is initiated comprising measurement when radio digital communication unit 115 is sent
After signal 150, electromagnetic wave measurement transmitting unit 116 starts to send electromagnetic wave measurement signal 130 with preset measurement frequency,
The power of the signal is greater than the power of digital signal 150.Electromagnetic wave measurement signal 130 is sent in stratum 160, by stratum
It is received after reflection by the receiving portion of device 120, the signal received is the electromagnetic wave measurement reflection signal for carrying dampening information
140。
In emitting portion, electromagnetic wave measurement transmitting unit 116 and radio digital communication unit 115 are connected respectively to multiplexing
On device 113.Multiplexer 113 is connected by antenna-matching circuit 112 with antenna 111, and effect is at different times by antenna
111 and its match circuit 112 coupled with radio digital communication unit 115 or electromagnetic wave measurement transmitting unit 116 to realizing day
Time-sharing multiplex of the line 111 in emitting portion 110.
I.e. when radio digital communication unit 115 works and when sending digital signal, multiplexer 113 be connected to antenna 111 and its
Match circuit 112 and radio digital communication unit 115, thus radio digital communication unit 115 can use antenna 111 and its
Digital signal is sent with circuit 112.When electromagnetic wave measurement transmitting unit 116 works concurrent power transmission magnetic wave measuring signal, multiplexing
Device 113 is connected to antenna 111 and its match circuit 112 and electromagnetic wave measurement transmitting unit 116, thus electromagnetic wave measurement transmitting unit
116 can use antenna 111 and its transmission electromagnetic wave measurement signal of match circuit 112.
The receiving portion 120 of device includes antenna 121 and antenna-matching circuit 122, measurement receiving module 124, multiplexer
123。
Measurement receiving module 124 is used to be received on different paths according to the measuring command to carry through what stratum was reflected
Reflect the reflection of electromagnetic wave signal 140 on the predetermined band of formation resistivity information, and to the reflection signal in different paths into
Row is handled so that it is determined that the transmitting module that measures is to the resistivity for measuring the stratum between receiving module.It includes wireless
Digital communication unit 125, decoding unit 127, acquisition amplifying circuit 126 and computing unit 128.
Similar emitting portion, the effect of the multiplexer 123 in receiving portion be at different times by antenna 121 and its
It couples to realize that antenna 121 is received in measurement with radio digital communication unit 125 or acquisition amplifying circuit 126 with circuit 122
Time-sharing multiplex in module 124.
During operation of the device, multiplexer 123 is first connected to antenna 121 and its match circuit 122 and radio digital communication unit
125, radio digital communication unit 125 receives the number from emitting portion 110 using antenna 121 and its match circuit 122
Signal 150 simultaneously forwards it to decoding unit 127.Decoding unit 127 is decoded received digital signal, to judge it
In whether comprising measurement initiate instruction.
When decoding unit 127 judges that digital signal includes that instruction is initiated in measurement, issues and swash to acquisition amplifying circuit 126
Instruction living, notifies it to enter measuring state.It acquires amplifying circuit 126 and enters measuring state after receiving activation instruction.Herein
In state, multiplexer 123 is connected to antenna 121 and its match circuit 122 and acquisition amplifying circuit 126, to acquire amplifying circuit
126, which receive electromagnetic wave measurement using antenna 121 and its match circuit 122, reflects signal 140.
The antenna 121 of receiving portion 120 includes a pair of of receiving antenna, symmetrically to receive the electromagnetic wave on different paths
Measurement reflection signal 140.The electromagnetic wave measurement signal 130 that emitting portion 110 emits is decayed by stratum 160, and generation is accompanied with
The electromagnetic wave measurement of formation resistivity information reflects signal 140, and formation resistivity message reflection reflects signal in electromagnetic wave measurement
Inside 140 phase and amplitude.When receiving electromagnetic wave measurement reflection signal 140, two receiving antennas of antenna 121 connect respectively
It receives, forms two paths of signals.It acquires amplifying circuit 126 and signal 140 is reflected to the electromagnetic wave measurement on each path of antenna 121
It is acquired enhanced processing, and signal is transmitted to computing unit 128 by treated.
Computing unit 128 calculates measurement transmitting mould after receiving the reflection signal that acquisition amplifying circuit 126 forwards
Block to measurement receiving module between formation resistivity.The phase of the two signals is subtracted each other to obtain phase difference.The two are believed
Number amplitude be divided by obtain Amplitude Ratio.The phase difference and Amplitude Ratio of the two signals and the relationship of formation resistivity can use one
A accurate theoretical model obtains formation resistivity values by mathematic(al) manipulation inversion method.
This transformation calculates phase difference and Amplitude Ratio with an accurate theoretical model based under the conditions of uniform dielectric
With the functional relation of resistivity, the phase difference to instrument in non-uniform dielectric and Amplitude Ratio are converted on this basis, most
Two independent resistivity are obtained eventually, are referred to as stratum Amplitude Ratio resistivity and phase difference resistivity.
When decoding unit 127 judges that digital signal does not include measurement initiation instruction, issued to acquisition amplifying circuit 126
Standby command notifies it to enter standby mode.It acquires amplifying circuit 126 and enters standby mode after receiving standby command.?
In this state, acquisition amplifying circuit 126 is closed.The switch state of computing unit 128 and acquisition amplifying circuit 126 keep one simultaneously
It causes, is also remained turned-off in standby mode.
As a result, in a measurement cycle period, receiving portion 120 be not received by measurement initiation command when in
Machine state, in the standby state, computing unit 128 and acquisition amplifying circuit 126 remain off, so that power consumption is reduced,
So that device has longer service life.
Since two parts of the LWD resistivity log device of the embodiment of the present invention are relatively independent, in order to guarantee emitting portion
110 and receiving portion 120 inside clock be consistent, in the present embodiment, measurement receiving module 114 and measurement transmitting module
Clock source inside 124 uses temperature-compensating crystal oscillating circuit, the consistency of clock when guaranteeing temperature change.
The antenna in antenna 111 and match circuit 112 and antenna 121 and match circuit 122 is using single in the present embodiment
Double receive of hair is arranged in pairs.In an alternative embodiment of the invention, in first antenna and match circuit and the second antenna and match circuit
Antenna be arranged in pairs using double receive of four hairs, and motivated away from a manner of by bifrequency, double source to obtain four radially
The resistivity information of a investigation depth.
The emitting portion of an embodiment according to the present invention, LWD resistivity log device is mounted on the upper end of power drilling tool,
The receiving portion of LWD resistivity log device is mounted on the lower end of power drilling tool far from the first part of device.As shown in Fig. 2,
The emitting portion of device forms the first pipe nipple 210 of power drilling tool, and the receiving portion of device forms the second pipe nipple of power drilling tool
220.First pipe nipple 210 includes at least one antenna 211, sends tested stratum for the electromagnetic wave measurement signal of specific frequency
In；Second pipe nipple 220 includes at least a pair of of antenna 221, to receive at least two-way reflection of electromagnetic wave signal.
As shown in Fig. 2, the second pipe nipple 220 and the first pipe nipple 210 are the cylindrical structure containing internal fluid passage,
Annular groove is provided on metallic framework 204 and 205.It is embedding in the groove of second pipe nipple 220 that there are two coil antennas 221；First
A coil antenna 211 is embedded in the groove of pipe nipple 210.Respectively there is pin end 200 at first pipe nipple 210 and 220 both ends of the second pipe nipple
With 201 and female connector 202 and 203.
The specific connection features of LWD resistivity log device are as follows: resistivity test device is separately mounted to underground and is moved
The both ends of power drilling tool.As shown in figure 3, the second pipe nipple 220 is located at below power drilling tool, 202 one end of female connector connects drill bit, public access
First 200 one end connects power drilling tool 300；First pipe nipple 210 is located above power drilling tool, and 203 one end of female connector connects power drill
Tool, the conventional drill assembly such as drill collar of the connection of pin end 201 top.
From figure 3, it can be seen that the Drilling derrick 301 being placed on ground and drilling machine 302 drive 303 high speed rotation of drilling rod, bore
Bar 303, power drilling tool 300, drill bit 304 and other be mounted on the tool in downhole assembly quickly to underground creep into, with
One wellbore 306 of Drilling in stratum.In this way, can cut into the different geological structure layer in underground, to verify subsurface geology situation.Tool
It says to body, power drilling tool 300 drives drill bit 304 to rotate.Drilling rod 303 includes longitudinal flow passage 305, and fluid channel 305 goes out
Mouth passes through the hydrophthalmia 308 of drill bit 304, and an annular space 307 is formed between drilling rod 303 and the borehole wall.
In the present embodiment, ground control unit or personnel are primarily based on the physical characteristic of power drilling tool 300 to electric with boring
The parameter of resistance rate measuring device is configured.Wherein, the physical characteristic of power drilling tool 300 includes length and material, with brill resistance
The parameter of rate measuring device includes measurement frequency and time of measuring.It is short by being equipped with first after the completion of to these parameter configurations
The power drilling tool 300 of section 210 and the second pipe nipple 220 is put into underground, and preparation starts to measure work.
Wherein, the first pipe nipple 210 is according to the received specific instruction of institute with periodically emission measurement order and electromagnetic wave
Measuring signal, the second pipe nipple 220 periodically receives the measuring command sent in the period, and is getting the measuring command
Afterwards, the reflection of electromagnetic wave signal comprising tested formation information of corresponding above-mentioned electromagnetic wave measurement signal is received.Second pipe nipple 220 is right
The received reflection of electromagnetic wave signal of institute amplifies acquisition and handles, and the phase difference of the reflection of electromagnetic wave signal after calculation processing
And amplitude ratio, amplification acquisition signal can effectively improve the signal-to-noise ratio of signal, can be realized and be amplified by multistage pre-amplification circuit
Acquire semiotic function.
The receiving antenna 221 of electromagnetic resistivity is installed in nearly bit location, and the position apart from drill bit is farthest not
It can be more than 1m.It follows that distance of the measurement point of the structure away from drill bit is compared with routine is with electromagnetic resistivity apparatus is bored
With apparent advantage.Simultaneously as the distance of transmitting antenna 211 to receiving antenna 221 is determined by the length of power drilling tool 300
Calmly, much larger than the distance of the transmitting antenna of conventional nearly bit resistivity measuring device to receiving antenna, investigation depth is also remote
Greater than conventional LWD resistivity log device, and measurement result is smaller by mud influence.
The mode at this both ends that first pipe nipple 210 and the second pipe nipple 220 are separately mounted to power drilling tool 300 was both effective
Ground is increased with the distance between power drilling tool electromagnetic wave resistivity survey apparatus receiving antenna and transmitting antenna, also meets reception
The requirement that the distance of antenna to drill bit must not be too far away.To guarantee what measured resistance parameter adjusted wellbore trace
The investigation depth of resistivity is increased while accurate directive function.
Fig. 4 is the flow chart of the LWD resistivity log method of embodiment according to the present invention.It is illustrated in the process of attached drawing
Out the step of, can execute in a computer system such as a set of computer executable instructions, although also, in flow charts
Logical order is shown, but in some cases, it can be with the steps shown or described are performed in an order that is different from the one herein.
Apparatus according to an embodiment of the present invention carries out resistivity measurement, first progress step S410, is based on power drilling tool
Parameter be pre-configured in LWD resistivity log device measurement receiving module and measure transmitting module measurement parameter, wherein
Measurement parameter includes measurement frequency or measurement cycle period.
This step is specially the parameter configured inside the first pipe nipple 210 and the second pipe nipple 220 in the present embodiment.It is based on
The physical characteristic of mud motor 300 configures the parameter with power drilling tool electromagnetic wave resistivity survey apparatus.Wherein,
The physical characteristic of power drilling tool 300 includes length and material, and the parameter with power drilling tool electromagnetic wave resistivity survey apparatus includes
Measurement frequency and time of measuring.
Aforesaid operations are completed on well.After the completion of to these parameter configurations, the first pipe nipple 210 is mounted on power drilling tool
Second pipe nipple 220 is mounted remotely from 300 lower end of power drilling tool of the first pipe nipple 210, and drill bit is mounted on by 300 upper ends
Two pipe nipples, 220 lower end is to close to receiving antenna 221.The power drilling tool of the first pipe nipple 210 and the second pipe nipple 220 will be equipped with
300 are put into underground, and preparation starts to measure work, and every step later is all completed in underground.
Then step S420 is carried out, signal sending step, in this step, the first pipe nipple 210 send pre- with different capacity
The electromagnetic wave and measurement for determining frequency range initiate order.Step S420 include two kinds of situations: under measurement frequency or measurement cycle period
In be the first situation, in the case, first send comprising measurement initiate order digital signal, then increase power send electricity
Magnetic wave measuring signal；It is second situation in addition to the first situation, in the case, sends and do not include measurement initiation order
Digital signal.
Next in step S440, whether the digital signal that the judgement of the second pipe nipple 220 receives includes that life is initiated in measurement
It enables, i.e. judgment step S420 is in any situation.By judgement, if the digital signal received does not include measurement and initiates life
It enables, then illustrates to issue without electromagnetic wave measurement signal in the step s 420.S450 is entered step at this time, and the second pipe nipple 220 enters
Standby mode, and return and repeat step S440 again, judged.The second pipe nipple 220 is only to received in the standby state
Signal carry out digital decoding and instruction identification.If it is determined that the digital signal received includes that order is initiated in measurement, then illustrate
There is the sending of electromagnetic wave measurement signal in the step s 420.S460 is entered step at this time, and the second pipe nipple 220 enters measuring state.
Under measuring state, progress step S470 first receives reflection of electromagnetic wave signal, the second pipe nipple 220 is not being gone the same way
The reflection of electromagnetic wave signal carried on the predetermined band for reflecting formation resistivity information reflected through stratum is received on diameter.It connects
Carry out step S480, handle reflection of electromagnetic wave signal, the second 220 pairs of pipe nipple difference path reflection signal amplify acquisition
And processing, and corresponding phase difference and Amplitude Ratio are calculated, to reflect the resistivity on stratum.
Finally, device is again introduced into step S450, the second pipe nipple 220 enters standby mode.In a measurement cycle period
In, the second pipe nipple 220 is in standby when being not received by measuring command, in this case, internal acquisition amplification
Circuit and computing unit remain off, thus its power consumption is very low.The second pipe nipple is substantially prolonged by this working method
220 service life, to save the whole maintenance cost of LWD resistivity log device.
Although disclosed herein embodiment it is as above, the content is only to facilitate understanding the present invention and adopting
Embodiment is not intended to limit the invention.Any those skilled in the art to which this invention pertains are not departing from this
Under the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But scope of patent protection of the invention, still should be subject to the scope of the claims as defined in the appended claims.
Claims (9)
1. a kind of LWD resistivity log device comprising:
First antenna and match circuit；
Transmitting module is measured, is connect with the first antenna and match circuit, to according to preset measurement cycle period
Emission measurement initiates the electromagnetic wave of order and predetermined band；
Second antenna and match circuit；
Receiving module is measured, is connect with second antenna and match circuit, to initiate order in difference according to the measurement
The reflection of electromagnetic wave signal carried on the predetermined band for reflecting formation resistivity information reflected through stratum is received on path,
And the reflection signal in the different paths is handled so that it is determined that the measurement transmitting module is to the measurement receiving module
Between formation resistivity；
Wherein, the measurement transmitting module further include:
First radio digital communication unit, to measurement receiving module send digital signal, the initiation of the digital signal with
Preset measurement cycle period or measurement frequency are related；
Electromagnetic wave measurement transmitting unit, to emit electromagnetic wave measurement signal, the wherein survey according to preset measurement frequency
The power for measuring signal is greater than the power of the digital signal；
Wherein, the measurement transmitting module is mounted in the first part of power drilling tool, and the measurement receiving module is far from described
Measurement transmitting module is mounted on the second part of the power drilling tool.
2. LWD resistivity log device as described in claim 1, wherein be equipped with first of the measurement transmitting module
Divide the first pipe nipple for forming the power drilling tool, is located at the top of the power drilling tool, the measurement receiving module is installed
Second part form the second pipe nipple of the power drilling tool, be located at the lower section of the power drilling tool.
3. LWD resistivity log device as claimed in claim 2, wherein second pipe nipple is located proximate to drill bit.
4. LWD resistivity log device as described in claim 1, wherein the antenna in second antenna and match circuit
It is arranged in pairs, symmetrically to receive the reflection of electromagnetic wave signal on different paths.
5. LWD resistivity log device as described in claim 1, wherein the first antenna and match circuit and second day
Antenna in line and match circuit is arranged in pairs using double receive of four hairs, and by bifrequency, double source motivated away from a manner of with
The resistivity information of four investigation depths is obtained radially.
6. LWD resistivity log device according to any one of claims 1 to 5, wherein the measurement receiving module packet
It includes:
Second radio digital communication unit receives the digital signal sent from the measurement transmitting module；
Whether decoding unit is decoded received digital signal, include wherein that order is initiated in measurement to identify；
Amplifying unit is acquired, is used in the case where identification has measurement to initiate order to from the second antenna and match circuit
Reflection of electromagnetic wave signal on each path is acquired enhanced processing；
Computing unit is used to calculate phase difference and Amplitude Ratio between the amplified reflection signal on different paths, from
And determine the measurement transmitting module to the formation resistivity between the measurement receiving module.
7. LWD resistivity log device as claimed in claim 6, wherein connected in the first antenna and match circuit
There is the first multiplexer, at different times by the first antenna and the first radio digital communication unit or the electromagnetism
The coupling of wave measurement transmitting unit was to realize time-sharing multiplex of the first antenna in measurement transmitting module, at described second day
Be connected with the second multiplexer on line and match circuit, second multiplexer at different times by second antenna with
The second radio digital communication unit or acquisition amplifying unit coupling are to realize that second antenna receives mould in measurement
Time-sharing multiplex in block.
8. LWD resistivity log device as described in claim 1, wherein the measurement receiving module and measurement transmitting
The clock source of module uses temperature-compensating crystal oscillating circuit.
9. a kind of using the side for carrying out resistivity measurement such as LWD resistivity log device of any of claims 1-8
Method, comprising the following steps:
Parameter based on power drilling tool is pre-configured with measurement receiving module and measurement hair in the LWD resistivity log device
The measurement parameter of module is penetrated, wherein the measurement parameter includes measurement frequency or measurement cycle period；
Measurement transmitting module sends the electromagnetism of predetermined band with different capacity under the measurement frequency or in measurement cycle period
Order is initiated in wave and measurement, and order is initiated in the measurement that wherein power of the electromagnetic wave signal of measured resistivity is greater than communication
Power；
In the case where receiving the measurement initiation order, the measurement receiving module enters measuring state, in different paths
It is upper to receive the reflection of electromagnetic wave signal carried on the predetermined band for reflecting formation resistivity information reflected through stratum and right
The reflection signal in the difference path is handled so that it is determined that the measurement transmitting module is between the measurement receiving module
Formation resistivity；
In the case where not receiving the measurement initiation order, the measurement receiving module is in standby.
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| CN113847011B (en) * | 2020-06-28 | 2024-04-09 | 中石化石油工程技术服务有限公司 | Measuring nipple for kick and lost circulation and measuring method |
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