CN105089651A - Logging-while-drilling resistivity measuring device and logging-while-drilling resistivity measuring method - Google Patents
Logging-while-drilling resistivity measuring device and logging-while-drilling resistivity measuring method Download PDFInfo
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Abstract
The invention discloses a logging-while-drilling resistivity measuring device. The logging-while-drilling resistivity measuring device comprises a first antenna and matching circuit, a measuring and transmitting module, a second antenna and matching circuit and a measuring and receiving module, wherein the measuring and transmitting module is connected with the first antenna and matching circuit; the measuring and receiving module is connected with the second antenna and matching circuit; the measuring and transmitting module is arranged on a first part of a power drilling tool; the measuring and receiving module is away from the measuring and transmitting module and is arranged on a second part of the power drilling tool. The invention also discloses a method for carrying out resistivity measuring by adopting the logging-while-drilling resistivity measuring device. According to the logging-while-drilling resistivity measuring device disclosed by the invention, a split type structure design is adopted, the logging-while-drilling resistivity measuring device is separately arranged at two ends of a downhole power drilling tool, the distance between a transmitting antenna and a receiving antenna can be effectively increased on the basis that the receiving antenna is enabled to get close to a drill bit as much as possible, an accurate guiding action of measured resistivity parameters on well drilling track adjusting is ensured, and the investigation depth of the resistivity is increased.
Description
Technical field
The present invention relates to petroleum drilling engineering field, relate to a kind of LWD resistivity log device and measuring method specifically, more specifically, relate to the electromagnetic resistivity test device of a kind of employing and measuring method.
Background technology
Along with the quick growth of offshore drilling and the development of horizontal well technology, the application of logging while drilling technology is also more and more extensive.The main distinction of well logging during and Regular wireline is that the real-time of its data acquisition, formation data have when slight invasion at drilling fluid to obtain, thus closer to undisturbed formation.While drilling well, complete the test of formation data, be transferred to ground, field assay, explanation, not only saved drilling period, and can drilling well have been instructed, regulate wellbore trace, improve drilling course.
Resistivity is the major parameter of reflection formation characteristics, and the measurement of resistivity logging while drilling is the key components of well logging during.Judge that formation characteristics changes by the resistivity measuring stratum near drill bit, analyze through comprehensive, can judge whether drill bit gets out reservoir in time, thus adjust well track in time, guarantee that well is accurately hit reservoir and navigates within reservoir the optimum position being conducive to oil-gas mining.
According to the measuring principle of resistivity, namely the investigation depth of resistivity and transmitting antenna have direct relation to the distance of reception antenna, and transmitting antenna is darker to the longer investigation depth of distance of reception antenna.Therefore, for ensureing certain precision, design the resistivity measurement instrument length of realization all more than 3 meters according to prior art.And the length of power drilling tool has generally all exceeded 5 meters, between drill bit and power drilling tool, also has the space of 1 meter.This causes the aerial position distance drill bit of resistivity measurement instrument the most at last more than 8 meters.Because most of oil field development all enters middle and advanced stage, oil reservoir is all thinner, does not reach more than 8 meters.Therefore, when in the face of comparatively oil sheet, the parameter using the measurement mechanism of above-mentioned prior art to obtain will become very difficult to regulate wellbore trace.
Also have a kind of measurement mechanism in prior art, its nearly drill bit is arranged on inside power drilling tool to the very short space of drill bit.But due to space constraint, the length of this quasi-instrument is very short, is usually less than 1 meter.In addition, common resistivity measurement instrument cannot be arranged on power drilling tool lower end, thus known transmitting antenna is just less to the distance of reception antenna.According to above-mentioned principle, this will finally cause the measurement result of nearly bit resistivity measuring apparatus very inaccurate.
In addition, because drilling fluid during drilling well can formation invade, if the investigation depth of resistivity is dark not, the stratum of measurement mainly occurs the stratum of mud filtrate invasion, not reach undisturbed formation.There is relatively large deviation in such measurement result and real result, instructs and regulate the value of wellbore trace also to have a greatly reduced quality.
Therefore, need a kind ofly can take into account the distance of survey mark to drill bit, can take into account again investigation depth with brill electromagnetic wave resistivity survey apparatus and method.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of LWD resistivity log device, it comprises
First antenna and match circuit;
Measure transmitter module, be connected with described first antenna and match circuit, to initiate the electromagnetic wave of order and predetermined band according to the measurement cycle period emission measurement preset;
Second antenna and match circuit;
Measure receiver module, be connected with described second antenna and match circuit, to receive the reflection of electromagnetic wave signal carried on the predetermined band reflecting formation resistivity information through stratum reflection on different path according to described measuring command, and the reflected signal in described different path is processed thus determines the formation resistivity between described transmitter module to described receiver module;
Wherein, described measurement transmitter module is arranged on the Part I of power drilling tool, and described measurement receiver module is arranged on the Part II of described power drilling tool away from described measurement transmitter module.
In one embodiment, the Part I being provided with described measurement transmitter module forms the first pipe nipple of described power drilling tool, it is located at the top of described power drilling tool, the Part II being provided with described measurement receiver module forms the second pipe nipple of described power drilling tool, and it is located at the below of described power drilling tool.
In one embodiment, the position of described second pipe nipple is near drill bit.
In one embodiment, the antenna in described second antenna and match circuit is arranged, in pairs to receive the reflection of electromagnetic wave signal on different path symmetrically.
In one embodiment, antenna in described first antenna and match circuit and the second antenna and match circuit adopts four two harvests to setting, and carries out the resistivity information that encourages to obtain four investigation depths diametrically in the mode of bifrequency, double source distance.
In one embodiment, described measurement transmitter module also comprises:
First digital wireless communication unit, to send data signal to measurement transmitter module, the initiation of described data signal is relevant with the measurement cycle period preset or measuring frequency;
Electromagnetic wave measurement transmitter unit, the measuring frequency emitting electromagnetic wave measuring-signal preset with basis, wherein the power of this measuring-signal is greater than the power of described data signal.
In one embodiment, described measurement receiver module comprises:
Second digital wireless communication unit, receives the data signal sent from described measurement transmitter module;
Decoding unit, decodes to received digital signal, initiates instruction to identify wherein whether to comprise measuring;
Gather amplifying unit, it amplifies process for carrying out collection when identifying and having and measure and initiate instruction to the reflection of electromagnetic wave signal on each path from the second antenna and match circuit;
Computing unit, the phase difference between its reflected signal after calculating the amplification on different path and Amplitude Ratio, thus determine the formation resistivity between described transmitter module to described receiver module.
In one embodiment, described first antenna and match circuit are connected with the first multiplexer, the time-sharing multiplex in transmitter module is being measured described first antenna to be coupled thus to realize described antenna with described first digital wireless communication unit or described electromagnetic wave measurement transmitter unit in the different moment, described second antenna and match circuit are connected with the second multiplexer, described second multiplexer is measuring the time-sharing multiplex in receiver module in order to described second antenna is coupled to realize described antenna with described second digital wireless communication unit or described collection amplifying unit in the different moment.
In one embodiment, the clock source of described measurement receiver module and described measurement transmitter module adopts temperature-compensating crystal oscillating circuit.
Employing such as above-mentioned LWD resistivity log device carries out a method for resistivity measurement, comprises the following steps:
Based on the measurement receiver module in the pre-configured described LWD resistivity log device of parameter of power drilling tool and the measurement parameter measuring transmitter module, wherein said measurement parameter comprises measuring frequency or measures cycle period;
Measure transmitter module under described measuring frequency or in measurement cycle period to initiate to order with the electromagnetic wave of different capacity transmission predetermined band and measurement, wherein the power of the electromagnetic wave signal of measured resistivity is greater than the power of the measurement initiation order of described communication;
When receiving described measurement and initiating order, described measurement receiver module enters measuring state, different path receives the reflection of electromagnetic wave signal carried on the predetermined band reflecting formation resistivity information through stratum reflection, and the reflected signal in described different path is processed thus determines the formation resistivity between described transmitter module to described receiver module;
When not receiving described measurement and initiating order, described measurement receiver module is in holding state.
Compared with prior art, the invention has the beneficial effects as follows:
LWD resistivity log device of the present invention adopts split-type structural design, make radiating portion and receiving unit can be arranged on the two ends of mud motor dividually, this effectively increases the distance in measurement mechanism between transmitting antenna and reception antenna, add the investigation depth of resistivity.
Simultaneously because one of receiving unit or radiating portion are arranged on the position near drill bit, can accomplish that for thin reservoir survey mark is positioned as close to drill bit, thus there is the distance length of shorter survey mark to drill bit, therefore ensure that the accurate directive function that measured resistance parameter regulates for wellbore trace.
In addition, according to measuring method of the present invention, it is measured in cycle period at one, makes receiving unit be in holding state when not receiving and measuring initiation command, make measurement mechanism power consumption according to the present invention very low, therefore measurement mechanism according to the present invention has longer application life.
On the other hand, be the synchronism ensureing the separately independent radiating portion installed and receiving unit, the clock source in respective circuit adopts temperature-compensating crystal oscillator, the uniformity of clock during to ensure variations in temperature.
Other features and advantages of the present invention will be set forth in the following description, and partly become apparent from manual, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in manual, claims and accompanying drawing and obtain.
Accompanying drawing explanation
Accompanying drawing is used for the invention provides more detailed description, and not as restriction.In the accompanying drawings:
Fig. 1 is the structural representation of the LWD resistivity log device according to the embodiment of the present invention;
Fig. 2 is reception pipe nipple after being combined with power drilling tool according to the LWD resistivity log device of the embodiment of the present invention and the structural representation launching pipe nipple;
Fig. 3 is the structure chart be arranged on according to the LWD resistivity log device of the embodiment of the present invention on power drilling tool;
Fig. 4 is the flow chart of LWD resistivity log method according to an embodiment of the invention.
Detailed description of the invention
Describe embodiments of the present invention in detail below with reference to accompanying drawing, to the present invention, how application technology means solve technical problem whereby, and the implementation procedure reaching technique effect can fully understand and implement according to this.It should be noted that, only otherwise form conflict, each feature in various embodiments of the present invention and each embodiment can be combined with each other, and the technical scheme formed is all within protection scope of the present invention.
The length of conventional LWD resistivity log device generally all more than 3m, because the distance between power drilling tool and drill bit generally more than 1m, therefore can not substantially all be installed on the upper end of the power drilling tool being in down-hole.Suppose LWD resistivity log device and then power drilling tool install, the distance of the antenna distance drill bit so on LWD resistivity log device is: antenna is to the length of the length of power drilling tool, power drilling tool and near bit tool length sum.Wherein, antenna is generally 0.5m-2m to the length of power drilling tool, and the length of power drilling tool is generally 5m-10m, and the length of nearly bit resistivity survey tool is about 1m.Therefore, even if under the condition that and then power drilling tool is installed with brill electromagnetic resistivity apparatus, the distance of antenna distance survey mark is also at 6.5m-13m.Like this, when oil reservoir is thinner, because survey tool distance drill bit is excessively far away, regulate wellbore trace very difficult.
In another kind of LWD resistivity log device, in order to the distance of antenna to drill bit that further, LWD resistivity log device is arranged on power drilling tool lower end.But because power drilling tool can not more than 1m to the distance of drill bit, therefore, the distance between the transmitting antenna of the electromagnetic resistivity of this kind of LWD resistivity log device and reception antenna is also no more than 1m.Because the resistivity measurement degree of depth is directly related with the distance between transmitting antenna and reception antenna, distance is larger, and fathom darker, therefore the resistivity measurement degree of depth of this kind of LWD resistivity log device is very limited.
For the deficiency of above existing LWD resistivity log device, as shown in Figure 1, relatively independent radiating portion 110 and receiving unit 120 two parts are divided into according to the LWD resistivity log device of the embodiment of the present invention.These two parts are arranged on the two ends of power drilling tool respectively, and the receiving unit 120 of device is arranged on the one end near drill bit.This mounting means had both effectively increased with the distance between power drilling tool electromagnetic wave resistivity survey apparatus reception antenna and transmitting antenna, also met the requirement that reception antenna can not be too far away to the distance of drill bit.Thus while the resistance parameter accurate directive function that wellbore trace is regulated measured by ensureing, add the investigation depth of resistivity.
The radiating portion 110 of device comprises antenna 111 and antenna-matching circuit 112, multiplexer 113, measures transmitter module 114.
Measure transmitter module 114 to be used for emission measurement and to initiate order or the electromagnetic wave of predetermined band.Measure transmitter module 114 can initiate order or predetermined band electromagnetic wave according to the measurement cycle period emission measurement preset.It comprises radio digital communication unit 115 and electromagnetic wave measurement transmitter unit 116.
Radio digital communication unit 115, in order to send data signal 150 to receiving unit 120.The transmission of data signal 150 is relevant with the measurement cycle period preset or measuring frequency.In each measurement cycle period, radio digital communication unit 115 send comprise measure initiate order data signal 150 in order to notify receiving unit 120 enter measuring state or send do not comprise measure initiate order data signal 150 in order to notify that receiving unit 120 enters holding state.
In each measurement cycle period, after radio digital communication unit 115 sends the data signal 150 comprising and measure and initiate order, the measuring frequency that electromagnetic wave measurement transmitter unit 116 starts to preset sends electromagnetic wave measurement signal 130, and the power of this signal is greater than the power of data signal 150.Electromagnetic wave measurement signal 130 is sent in stratum 160, and received by the receiving unit 120 of device after the reflection of stratum, the signal received is the electromagnetic wave measurement reflected signal 140 carrying dampening information.
In radiating portion, electromagnetic wave measurement transmitter unit 116 and radio digital communication unit 115 are connected respectively on multiplexer 113.Multiplexer 113 is connected with antenna 111 by antenna-matching circuit 112, and it acts on is antenna 111 and match circuit 112 thereof to be coupled with radio digital communication unit 115 or electromagnetic wave measurement transmitter unit 116 in the different moment thus to realize the time-sharing multiplex of antenna 111 in radiating portion 110.
Namely when radio digital communication unit 115 works and sends data signal, multiplexer 113 is communicated with antenna 111 and match circuit 112 thereof and radio digital communication unit 115, thus radio digital communication unit 115 can utilize antenna 111 and match circuit 112 thereof to send data signal.When electromagnetic wave measurement transmitter unit 116 works concurrent power transmission magnetic wave measuring-signal, multiplexer 113 is communicated with antenna 111 and match circuit 112 thereof and electromagnetic wave measurement transmitter unit 116, thus electromagnetic wave measurement transmitter unit 116 can utilize antenna 111 and match circuit 112 thereof to send electromagnetic wave measurement signal.
The receiving unit 120 of device comprises antenna 121 and antenna-matching circuit 122, measures receiver module 124, multiplexer 123.
Measure receiver module 124 to be used on different path, receiving according to described measuring command the reflection of electromagnetic wave signal 140 carried on the predetermined band reflecting formation resistivity information reflected through stratum, and the reflected signal in different path is processed thus determines the formation resistivity between transmitter module to receiver module.It comprises radio digital communication unit 125, decoding unit 127, gathers amplifying circuit 126 and computing unit 128.
Similar radiating portion, the effect of the multiplexer 123 in receiving unit is by antenna 121 and match circuit 122 thereof and radio digital communication unit 125 or gather amplifying circuit 126 and be coupled thus realize antenna 121 and measuring the time-sharing multiplex in receiver module 124 in the different moment.
When device works, multiplexer 123 is first communicated with antenna 121 and match circuit 122 thereof and radio digital communication unit 125, and radio digital communication unit 125 utilizes antenna 121 and match circuit 122 thereof receive the data signal 150 from radiating portion 110 and are transmitted to decoding unit 127.Decoding unit 127 pairs of received digital signals are decoded, and initiate instruction to judge wherein whether to comprise to measure.
When decoding unit 127 judges that data signal comprises measurement initiation instruction, it sends activation instruction to collection amplifying circuit 126, notifies that it enters measuring state.Gather amplifying circuit 126 and enter measuring state after receiving activation instruction.In this state, multiplexer 123 is communicated with antenna 121 and match circuit 122 thereof and gathers amplifying circuit 126, thus collection amplifying circuit 126 utilizes antenna 121 and match circuit 122 thereof to receive electromagnetic wave measurement reflected signal 140.
The antenna 121 of receiving unit 120 comprises a pair reception antenna, to receive the electromagnetic wave measurement reflected signal 140 on different path symmetrically.The electromagnetic wave measurement signal 130 that radiating portion 110 is launched is decayed through stratum 160, and generate the electromagnetic wave measurement reflected signal 140 being accompanied with formation resistivity information, formation resistivity message reflection is inside the phase place and amplitude of electromagnetic wave measurement reflected signal 140.When receiving electromagnetic wave measurement reflected signal 140, two reception antennas of antenna 121 receive respectively, form two paths of signals.Gather amplifying circuit 126 and amplify process to carrying out collection from the electromagnetic wave measurement reflected signal 140 on each path of antenna 121, and the signal after process is transmitted to computing unit 128.
Computing unit 128 receive gather the reflected signal that forwards of amplifying circuit 126 after calculate formation resistivity between transmitter module to receiver module.The phase place of these two signals is subtracted each other and obtains phase difference.The amplitude of these two signals is divided by and obtains Amplitude Ratio.The relation of the phase difference of these two signals and Amplitude Ratio and formation resistivity, with an accurate theoretical model, can obtain formation resistivity values by mathematic(al) manipulation inversion method.
This conversion is based under uniform dielectric condition, the functional relation of phase difference and Amplitude Ratio and resistivity is calculated with an accurate theoretical model, on this basis the phase difference of instrument in non-uniform dielectric and Amplitude Ratio are changed, finally obtain two independently resistivity, be called stratum Amplitude Ratio resistivity and phase difference resistivity.
When decoding unit 127 judges that data signal does not comprise measurement initiation instruction, it sends standby command to collection amplifying circuit 126, notifies that it enters holding state.Gather amplifying circuit 126 and enter holding state after receiving standby command.In this state, gather amplifying circuit 126 and close.The on off state of computing unit 128 is consistent with collection amplifying circuit 126 simultaneously, and it also keeps closing in holding state.
Thus, measure in cycle period at one, receiving unit 120 is in holding state when not receiving and measuring initiation command, in the standby state, computing unit 128 and collection amplifying circuit 126 keep closed condition, thus reduce power consumption, make device have longer application life.
Because two parts of the LWD resistivity log device of the embodiment of the present invention are relatively independent, in order to ensure that the clock of radiating portion 110 and receiving unit 120 inside is consistent, in the present embodiment, the clock source measured receiver module 124 and measure transmitter module 114 inside adopts temperature-compensating crystal oscillating circuit, the uniformity of clock during to ensure variations in temperature.
Antenna in the present embodiment in antenna 111 and match circuit 112 and antenna 121 and match circuit 122 adopts single-emission and double-receiving to arrange in pairs.In an alternative embodiment of the invention, antenna in first antenna and match circuit and the second antenna and match circuit adopts four two harvests to setting, and carries out the resistivity information that encourages to obtain four investigation depths diametrically in the mode of bifrequency, double source distance.
According to one embodiment of the invention, the radiating portion of LWD resistivity log device is arranged on the upper end of power drilling tool, and the receiving unit of LWD resistivity log device is arranged on the lower end of power drilling tool away from the Part I of device.As shown in Figure 2, the radiating portion of device forms the first pipe nipple 210 of power drilling tool, and the receiving unit of device forms the second pipe nipple 220 of power drilling tool.First pipe nipple 210 comprises at least one antenna 211, to be sent in tested stratum by the electromagnetic wave measurement signal of CF; Second pipe nipple 220 comprises at least one pair of antenna 221, to receive at least two-way reflection of electromagnetic wave signal.
As shown in Figure 2, the second pipe nipple 220 and the first pipe nipple 210 are the cylindrical structural containing inner fluid passage, and metallic framework 204 and 205 has annular groove.Two coil antennas 221 are embedded with in the groove of the second pipe nipple 220; A coil antenna 211 is embedded with in the groove of the first pipe nipple 210.Respectively there are male joint 200 and 201 and female joint 202 and 203 in first pipe nipple 210 and the second pipe nipple 220 two ends.
LWD resistivity log device concrete connection features be: two ends resistivity test device being arranged on respectively mud motor.As shown in Figure 3, the second pipe nipple 220 is positioned at below power drilling tool, and female joint 202 one end connects drill bit, and male joint 200 one end connects power drilling tool 300; First pipe nipple 210 is positioned at above power drilling tool, and female joint 203 one end connects power drilling tool, and male joint 201 connects the conventional drilling assembly such as the drill collar of top.
As can be seen from Figure 3, be placed in ground Drilling derrick 301 and drive drilling rod 303 High Rotation Speed with rig 302, drilling rod 303, power drilling tool 300, drill bit 304 and other instruments be arranged in DHA creep into underground fast, with the well 306 of Drilling in stratum.Like this, the geological structure layer that underground is different can be cut, to verify subsurface geology situation.Specifically, power drilling tool 300 drives drill bit 304 to rotate.Drilling rod 303 comprises longitudinal flow passage 305, and the outlet of fluid passage 305, through the hydrophthalmia 308 of drill bit 304, forms an annular space 307 between drilling rod 303 and the borehole wall.
In the present embodiment, first ground control unit or personnel are configured based on the parameter of physical characteristic to LWD resistivity log device of power drilling tool 300.Wherein, the physical characteristic of power drilling tool 300 comprises length and material, and the parameter of LWD resistivity log device comprises measuring frequency and Measuring Time.After these parameter configuration are completed, the power drilling tool 300 being equipped with the first pipe nipple 210 and the second pipe nipple 220 is put into down-hole, prepare to start surveying work.
Wherein, first pipe nipple 210 according to received specific instruction with periodically emission measurement order and electromagnetic wave measurement signal, second pipe nipple 220 periodically accepts the measuring command sent in this cycle, and after getting this measuring command, receive the reflection of electromagnetic wave signal comprising tested formation information of corresponding above-mentioned electromagnetic wave measurement signal.Second pipe nipple 220 carries out amplification to received reflection of electromagnetic wave signal and gathers and process, and the phase difference of reflection of electromagnetic wave signal after computing and amplitude ratio, amplify the signal to noise ratio that collection signal effectively can improve signal, realize amplifying collection signal function by multistage pre-amplification circuit.
The reception antenna 221 of electromagnetic resistivity is installed in nearly bit location, and the position of its distance drill bit farthest can not more than 1m.It can thus be appreciated that, the survey mark of this structure apart from drill bit distance and routine with boring compared with electromagnetic resistivity apparatus, there is obvious advantage.Simultaneously, because the distance of transmitting antenna 211 to reception antenna 221 is determined by the length of power drilling tool 300, much larger than the transmitting antenna of the nearly bit resistivity measurement mechanism of routine to the distance of reception antenna, its investigation depth is also much larger than conventional LWD resistivity log device, and measurement result is less by mud influence.
This mode first pipe nipple 210 and the second pipe nipple 220 being arranged on respectively the two ends of power drilling tool 300 had both effectively increased with the distance between power drilling tool electromagnetic wave resistivity survey apparatus reception antenna and transmitting antenna, also met the requirement that reception antenna can not be too far away to the distance of drill bit.Thus while the resistance parameter accurate directive function that wellbore trace is regulated measured by ensureing, add the investigation depth of resistivity.
Fig. 4 is the flow chart of LWD resistivity log method according to an embodiment of the invention.Can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although show logical order in flow charts, in some cases, can be different from the step shown or described by order execution herein.
Apparatus according to an embodiment of the present invention carries out resistivity measurement, first step S410 is carried out, based on the measurement receiver module in the pre-configured LWD resistivity log device of parameter of power drilling tool and the measurement parameter measuring transmitter module, wherein measurement parameter comprises measuring frequency or measures cycle period.
This step is specially the parameter of configuration first pipe nipple 210 and the second pipe nipple 220 inside in the present embodiment.Its physical characteristic based on mud motor 300 is configured the parameter with power drilling tool electromagnetic wave resistivity survey apparatus.Wherein, the physical characteristic of power drilling tool 300 comprises length and material, and the parameter with power drilling tool electromagnetic wave resistivity survey apparatus comprises measuring frequency and Measuring Time.
Aforesaid operations completes aboveground.After these parameter configuration are completed, first pipe nipple 210 is arranged on power drilling tool 300 upper end, second pipe nipple 220 is arranged on power drilling tool 300 lower end away from the first pipe nipple 210, and drill bit is arranged on the second pipe nipple 220 lower end thus close reception antenna 221.The power drilling tool 300 being equipped with the first pipe nipple 210 and the second pipe nipple 220 is put into down-hole, and prepare to start surveying work, every step afterwards all completes in down-hole.
Then carry out step S420, signal forwarding step, in this step, the first pipe nipple 210 sends the electromagnetic wave of predetermined band with different capacity and measures initiation order.Step S420 comprises two kinds of situations: be the first situation under measuring frequency or in measurement cycle period, in the case, first send the data signal comprising and measure and initiate to order, then add high-power transmission electromagnetic wave measurement signal; Be the second situation except the first situation, in the case, send the data signal not comprising and measure and initiate order.
Next, in step S440, the second pipe nipple 220 judges whether the data signal received comprises to measure and initiates order, and namely determining step S420 is in any situation.Through judging, if the data signal received does not comprise to measure initiate order, then illustrating and not having electromagnetic wave measurement signal to send in the step s 420.Now enter step S450, the second pipe nipple 220 enters holding state, and returns repetition step S440 again, judges.In the standby state the second pipe nipple 220 only to digital decoding and instruction identification are carried out to received signal.If judge that the data signal received comprises to measure to initiate order, then illustrate and have electromagnetic wave measurement signal to send in the step s 420.Now enter step S460, the second pipe nipple 220 enters measuring state.
Under measuring state, first carry out step S470, receive reflection of electromagnetic wave signal, the second pipe nipple 220 receives the reflection of electromagnetic wave signal carried on the predetermined band reflecting formation resistivity information through stratum reflection on different path.Then carry out step S480, process reflection of electromagnetic wave signal, the second pipe nipple 220 carries out amplification acquisition and processing to the reflected signal in different path, and calculates corresponding phase difference and Amplitude Ratio, thus reflects the resistivity on stratum.
Finally, device enters step S450 again, and the second pipe nipple 220 enters holding state.Measure in cycle period at one, the second pipe nipple 220 is in holding state when not receiving measuring command, and in this case, the collection amplifying circuit of its inside and computing unit keep closed condition, and thus its power consumption is very low.Be substantially prolongs the application life of the second pipe nipple 220 by this working method, thus save the overall maintenance cost of LWD resistivity log device.
Although embodiment disclosed in this invention is as above, the embodiment that described content just adopts for the ease of understanding the present invention, and be not used to limit the present invention.Technician in any the technical field of the invention; under the prerequisite not departing from spirit and scope disclosed in this invention; any amendment and change can be done what implement in form and in details; but scope of patent protection of the present invention, the scope that still must define with appending claims is as the criterion.
Claims (10)
1. a LWD resistivity log device, it comprises:
First antenna and match circuit;
Measure transmitter module, be connected with described first antenna and match circuit, to initiate the electromagnetic wave of order and predetermined band according to the measurement cycle period emission measurement preset;
Second antenna and match circuit;
Measure receiver module, be connected with described second antenna and match circuit, to receive the reflection of electromagnetic wave signal carried on the predetermined band reflecting formation resistivity information through stratum reflection on different path according to described measuring command, and the reflected signal in described different path is processed thus determines the formation resistivity between described transmitter module to described receiver module;
Wherein, described measurement transmitter module is arranged on the Part I of described power drilling tool, and described measurement receiver module is arranged on the Part II of described power drilling tool away from described measurement transmitter module.
2. LWD resistivity log device as claimed in claim 1, wherein, the Part I being provided with described measurement transmitter module forms the first pipe nipple of described power drilling tool, it is located at the top of described power drilling tool, the Part II being provided with described measurement receiver module forms the second pipe nipple of described power drilling tool, and it is located at the below of described power drilling tool.
3. LWD resistivity log device as claimed in claim 2, wherein, the position of described second pipe nipple is near drill bit.
4. LWD resistivity log device as claimed in claim 1, wherein, the antenna in described second antenna and match circuit is arranged, in pairs to receive the reflection of electromagnetic wave signal on different path symmetrically.
5. LWD resistivity log device as claimed in claim 1, wherein, antenna in described first antenna and match circuit and the second antenna and match circuit adopts four two harvests to setting, and carries out the resistivity information that encourages to obtain four investigation depths diametrically in the mode of bifrequency, double source distance.
6. the LWD resistivity log device according to any one of claim 1-5, wherein, described measurement transmitter module also comprises:
First digital wireless communication unit, to send data signal to measurement receiver module, the initiation of described data signal is relevant with the measurement cycle period preset or measuring frequency;
Electromagnetic wave measurement transmitter unit, the measuring frequency emitting electromagnetic wave measuring-signal preset with basis, wherein the power of this measuring-signal is greater than the power of described data signal.
7. LWD resistivity log device as claimed in claim 6, wherein, described measurement receiver module comprises:
Second digital wireless communication unit, receives the data signal from described measurement transmitter module;
Decoding unit, decodes to received digital signal, initiates instruction to identify wherein whether to comprise measuring;
Gather amplifying unit, it amplifies process for carrying out collection when identifying and having and measure and initiate instruction to the reflection of electromagnetic wave signal on each path from the second antenna and match circuit;
Computing unit, the phase difference between its reflected signal after calculating the amplification on different path and Amplitude Ratio, thus determine the formation resistivity between described transmitter module to described receiver module.
8. LWD resistivity log device as claimed in claim 6, wherein, described first antenna and match circuit are connected with the first multiplexer, the time-sharing multiplex in transmitter module is being measured described first antenna to be coupled thus to realize described antenna with described first digital wireless communication unit or described electromagnetic wave measurement transmitter unit in the different moment, described second antenna and match circuit are connected with the second multiplexer, described second multiplexer is measuring the time-sharing multiplex in receiver module in order to described second antenna is coupled to realize described antenna with described second digital wireless communication unit or described collection amplifying unit in the different moment.
9. LWD resistivity log device as claimed in claim 1, wherein, the clock source of described measurement receiver module and described measurement transmitter module adopts temperature-compensating crystal oscillating circuit.
10. adopt LWD resistivity log device as claimed in any one of claims 1-9 wherein to carry out a method for resistivity measurement, comprise the following steps:
Based on the measurement receiver module in the pre-configured described LWD resistivity log device of parameter of power drilling tool and the measurement parameter measuring transmitter module, wherein said measurement parameter comprises measuring frequency or measures cycle period;
Measure transmitter module under described measuring frequency or in measurement cycle period to initiate to order with the electromagnetic wave of different capacity transmission predetermined band and measurement, wherein the power of the electromagnetic wave signal of measured resistivity is greater than the power of the measurement initiation order of described communication;
When receiving described measurement and initiating order, described measurement receiver module enters measuring state, different path receives the reflection of electromagnetic wave signal carried on the predetermined band reflecting formation resistivity information through stratum reflection, and the reflected signal in described different path is processed thus determines the formation resistivity between described transmitter module to described receiver module;
When not receiving described measurement and initiating order, described measurement receiver module is in holding state.
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| Publication number | Priority date | Publication date | Assignee | Title |
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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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