CN111119871A - Measuring device for measuring formation density value and measuring method thereof - Google Patents
Measuring device for measuring formation density value and measuring method thereof Download PDFInfo
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- CN111119871A CN111119871A CN201811282351.0A CN201811282351A CN111119871A CN 111119871 A CN111119871 A CN 111119871A CN 201811282351 A CN201811282351 A CN 201811282351A CN 111119871 A CN111119871 A CN 111119871A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The invention provides a measuring device for measuring formation density values, which comprises: the drill collar is internally provided with an axially-through eccentric flow channel and an axially-extending U-shaped groove opposite to the eccentric flow channel; the circuit framework is arranged in the eccentric flow channel and is constructed into a cylinder shape, and a circuit control system is arranged at the lower part of the circuit framework; a density bin source disposed within the drill collar, wherein radioactive elements are disposed within the density bin source and gamma rays are emitted at a fixed angle to the surrounding formation; the density detector is characterized in that the pressure-bearing shell is embedded in the U-shaped groove and is formed into a cylindrical shape, a density detector short section used for receiving gamma rays scattered by a stratum is arranged in the pressure-bearing shell, a signal transmission system used for transmitting measured signal parameters is arranged at the lower end of the density detector short section, and the signal transmission system is connected with the circuit control system. The invention also provides a measuring method for measuring the formation density value.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a logging-while-drilling technology, and particularly relates to a measuring device for measuring a formation density value. The invention also relates to a measuring method for measuring the formation density value.
Background
During the process of oil exploration and development, geological information of a stratum needs to be measured, particularly lithology and density values of the stratum, which is of great significance for calculating the porosity of the stratum and analyzing a reservoir. With the gradual deepening of exploration and development technologies, the requirement on the accuracy of geological information measurement parameter results is higher and higher.
However, there are some problems with the density measuring devices commonly available on the market. For example, the conventional density measuring device does not have the characteristic of azimuth measurement, which only emits gamma rays to the stratum through the radioactive isotope 137Cs and calculates the density value by measuring the gamma rays scattered back through the stratum through a long-and-short source distance detector, and the conventional measuring device has no resolution capability in the circumferential direction and cannot perform azimuth detection. In addition, the traditional density measuring device enables the density detector to be attached to a well wall in a mechanical or hydraulic pushing mode, so that a high-power motor is needed to be used in a circuit, the power consumption and complexity of the circuit are greatly increased, and the reliability of the density device is greatly reduced.
Disclosure of Invention
In view of at least some of the above technical problems, the present invention is directed to a measuring device for measuring formation density values, which is capable of accurately and effectively measuring lithological density values in different directions in a formation, and has a simple structure, low circuit power consumption, safety and reliability.
The invention also provides a measuring method for measuring the formation density value, which uses the measuring device to measure and has high accuracy of the measuring result.
To this end, according to a first aspect of the invention, there is provided a measurement apparatus for measuring formation density values, comprising: the drill collar is internally provided with an axially-penetrating eccentric flow channel, and the side wall of the drill collar, which is opposite to the eccentric flow channel, is provided with an axially-extending U-shaped groove; the eccentric channel is arranged in the eccentric flow channel and is constructed into a cylindrical circuit framework, an axially-penetrating eccentric channel is arranged in the circuit framework, a guide pipe for guiding drilling fluid is arranged in the eccentric channel, and a circuit control system is arranged at the lower part of the circuit framework; the density bin source is arranged at the upper part of the U-shaped groove, radioactive elements are placed in the density bin source, and gamma rays are emitted to the surrounding stratum at a fixed angle; the density detector short section is arranged in the pressure-bearing shell, the density detector short section is used for receiving gamma rays scattered by a stratum, a signal transmission system used for transmitting measured signal parameters of the gamma rays scattered by the stratum is arranged at the lower end of the density detector short section, and the signal transmission system is connected with the circuit control system to transmit the measured signals to the circuit control system, so that the stratum density value is obtained through calculation and analysis.
In a preferred embodiment, the density detector short section comprises a short-source-distance crystal detector, a short-source-distance photomultiplier, a long-source-distance crystal detector and a long-source-distance photomultiplier, which are sequentially arranged in the pressure-bearing shell from top to bottom and used for detecting received signals.
In a preferred embodiment, the signal transmission system comprises a pre-amplification circuit and a high-voltage control circuit connected with the pre-amplification circuit, the pre-amplification circuit is connected with the short-source-distance crystal detector and the long-source-distance crystal detector, and the high-voltage control circuit is connected with the acquisition control storage circuit.
In a preferred embodiment, the circuit control system includes: the interval measurement circuit is used for measuring the diameter of a borehole and the interval between the measurement device and the borehole wall, the azimuth measurement circuit is used for measuring azimuth information, the measurement circuit averagely divides the stratum around the borehole into 16 sector signals for measurement, the acquisition control storage circuit is used for processing the detected signals and is connected with the interval measurement circuit and the azimuth measurement circuit, and the power supply control circuit is used for providing power supply voltage meeting the requirements for the interval measurement circuit, the acquisition control storage circuit and the azimuth measurement circuit.
In a preferred embodiment, the density bin source is disposed at an angle oblique to the central axis of the drill collar.
In a preferred embodiment, the density bin source is surrounded by a shield for absorbing scattered gamma rays, and the shield is made of a tungsten-nickel-iron material.
In a preferred embodiment, the pressure-bearing housing is connected to the circuit framework by a pressure-bearing plug.
In a preferred embodiment, an anti-wear cover plate is fixedly mounted on the radial outer side of the drill collar corresponding to the pressure-bearing shell, and a centering anti-wear cover plate is arranged on the radial outer side of the drill collar opposite to the anti-wear cover plate.
In a preferred embodiment, a short-source-distance window and a long-source-distance window for receiving gamma rays scattered by the formation are respectively arranged in the regions, corresponding to the short-source-distance crystal detector and the long-source-distance crystal detector, of the wear-resistant cover plate, and the short-source-distance window and the long-source-distance window are both made of beryllium and/or titanium.
According to a second aspect of the present invention, there is provided a method of measuring formation density values using a measurement device as described above, comprising the steps of:
lowering the measurement device into the borehole and directionally emitting gamma rays through the radioactive elements within the density bin source into the surrounding formation;
receiving gamma rays scattered by the stratum through the short section of the density detector, processing received gamma ray signals through the signal transmission system, transmitting the processed gamma ray signals to the acquisition control storage circuit, and transmitting measurement signals of the gap measurement circuit and the azimuth measurement circuit to the acquisition control storage circuit;
the acquisition control storage circuit analyzes and processes the acquired signal parameters and transmits the signal parameters to the ground system to obtain the lithology and density value of the stratum through related calculation.
Drawings
The invention will now be described with reference to the accompanying drawings.
Fig. 1 shows an axial cross-sectional view of a measuring device for measuring formation density values according to the present invention.
Fig. 2 shows a radial cross-section at the position a-a in the measuring device of fig. 1.
Fig. 3, 4 and 5 show schematic diagrams of three different viewing angles of the circuit framework in the measuring device of fig. 1, respectively.
Fig. 6 shows a schematic control flow of signals of the measuring apparatus shown in fig. 1.
In the present application, the drawings are all schematic and are used only for illustrating the principles of the invention and are not drawn to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
In this application, it is noted that the end of the wellbore lowered by the measuring device for measuring formation density values according to the invention close to the wellhead is defined as the upper end or the like, while the end away from the wellhead is defined as the lower end or the like.
FIG. 1 shows an axial cross-sectional view of a measurement device 100 for measuring formation density values in accordance with the present invention. Fig. 2 shows a radial cross-section of the measuring device 100 at position a-a. The measuring device 100 includes a drill collar 110 for connection to other drilling tools, as shown in FIGS. 1 and 2, the drill collar 110 is cylindrically configured, and an eccentric flow passage 111 is axially provided through the drill collar 110. An axially extending U-shaped slot 112 is provided in the side wall of the drill collar 110 opposite the eccentric flow passage. A circuit frame 120 is provided in the eccentric flow path 111, the circuit frame 120 is configured in a cylindrical shape, and an eccentric passage 121 axially penetrating is provided inside the circuit frame 120. The circuit control system 130 is disposed at the lower portion of the circuit frame 120, and the circuit control system 130 is used for detecting and processing signals. A flow guide tube 122 is arranged in the eccentric passage 121 of the circuit framework 120, and the flow guide tube 122 is used for guiding the drilling fluid to the drill bit from the ground.
In accordance with the present invention, at least one eccentric flow passage 111 is provided in the drill collar 110 for mounting a flow guide tube 122 to direct drilling fluid from the surface to the drill bit.
In addition, a density reservoir source 140 is disposed on the sidewall of the drill collar 110 in the upper portion of the U-groove 112. In the embodiment shown in FIG. 1, the density bin source 140 is disposed at an angle oblique to the central axial direction of the drill collar 110. Radioactive elements are placed within the density bin sources 140 as the radiation source for the measuring device 100, and the density bin sources 140 emit gamma rays at a fixed angle towards the surrounding formation. In one embodiment, a 2 curie source of emissive 137Cs is placed within the density bin source 140 to act as a radiation source.
In this embodiment, the density bin source 140 is surrounded by a shield 141 for absorbing scattered gamma rays. Preferably, the shielding body 141 is made of a high-density wolfram-nickel-iron material, and the thickness of the wolfram-nickel-iron material is set according to actual working conditions. The shield 141 is effective to shield scattered gamma rays that do not enter the formation to reduce the effect on the measurement.
According to the present invention, a pressure-bearing housing 150 is installed in a recessed manner in the U-shaped groove 112. As shown in fig. 1, the pressure-containing housing 150 is configured in a cylindrical shape. In one embodiment, the lower end of the pressure-bearing housing 150 is connected to the circuit skeleton 120 by a pressure-bearing plug 151. A density detector assembly for detecting and receiving gamma rays scattered by the formation is arranged in the pressure-bearing housing 150 and comprises a density detector nipple 160 and a signal transmission system 170 arranged at the lower end of the density detector nipple 160. The signal transmission system 170 is connected to the density detector sub 160 for transmitting the measured signal parameters of gamma rays scattered from the formation, and the signal transmission system 170 is connected to the circuit control system 130. The density detector sub 160 comprises a short source distance crystal detector 161, a short source distance photomultiplier 162, a long source distance crystal detector 163 and a long source distance photomultiplier 164 which are sequentially arranged in the pressure-bearing shell 150 from top to bottom. In one embodiment, the short source-spaced crystal detector 161 and the long source-spaced crystal detector 163 are NaI scintillation crystal detectors. The density detector sub 160 receives gamma rays reflected and scattered from the formation through a short source range crystal detector 161 and a long source range crystal detector 163.
In the present embodiment, the signal transmission system 170 includes a pre-amplifier circuit 171 and a high-voltage control circuit 172 connected to the pre-amplifier circuit 171. The preamplification circuit 171 is connected with the short-source-distance crystal detector 161 and the long-source-distance crystal detector 163 and is used for transmitting signal parameters of gamma rays scattered by the stratum, which are measured by the density detector short section 160.
In accordance with the present invention, an anti-wear cover plate 180 and a centering anti-wear cover plate 190 are provided on the outer wall of the drill collar 110. As shown in fig. 2, the anti-wear cover plate 180 is fixedly installed on the radial outer side of the drill collar 110 corresponding to the pressure-bearing housing 150, the centering anti-wear cover plate 190 is fixedly installed on the radial outer side of the drill collar 110 opposite to the anti-wear cover plate 180, and the anti-wear cover plate 180 and the centering anti-wear cover plate 190 protrude radially outward. Meanwhile, in the regions of the anti-wear cover plate 180 corresponding to the short-source-distance crystal detector 161 and the long-source-distance crystal detector 162, a short-source-distance window 181 and a long-source-distance window 182 for receiving gamma rays scattered by the formation are respectively arranged. In one embodiment, short source distance window 181 and long source distance window 182 are both made of beryllium and/or titanium. The protruding anti-abrasion cover plate 181 enables the measuring device 100 to better adhere to the well wall, thereby improving the accuracy of actual measurement data. At the same time. The centering wear-resistant cover plate 182 can play an auxiliary role, and the centering wear-resistant cover plate 182 is selectively used in the actual construction process.
According to the present invention, the size of the short source distance window 181 and the long source distance window 182 on the wear cover 180, as well as the source distance, is determined according to the gamma field distribution of the 137Cs radioactive source placed in the density bin source 140 under different formation conditions.
Because the scattering and absorption capabilities of the formation for gamma photons vary with the formation density, the readings of reflected photons recorded by the density detector sub 160 vary with the formation density. And because the electron density and the electron density index in the stratum have positive correlation with the Compton linear attenuation coefficient, the corresponding relation with the lithology of the stratum can be obtained by measuring the electron density. During the logging process, the measured parameters are still affected by the environmental factors, and therefore, the measured parameters need to be corrected by the circuit control system 130 to obtain accurate formation information.
Fig. 3, 4 and 5 show schematic diagrams of three different viewing angles of the circuit skeleton 120, respectively. As shown in fig. 3, 4 and 5, the circuit control system 130 is disposed at a lower portion of the circuit skeleton 120. The circuit control system 130 comprises a gap measuring circuit 131, an acquisition control storage circuit 132, an orientation measuring circuit 133 and a power control circuit 134 which are sequentially and fixedly mounted on the outer wall of the lower end of the circuit framework 120. The circuit control system 130 corrects the measurement parameters by the azimuth measurement circuit 133 and the gap measurement circuit 131. The power control circuit 134 is used to supply power to the gap measurement circuit 131, the acquisition control storage circuit 132, and the azimuth measurement circuit 133. The power control circuit 134 provides power input from the central control system or the ground system and outputs a suitable power supply voltage. The output power supply voltage needs to meet the requirements of the gap measurement circuit 131, the acquisition control storage circuit 132 and the azimuth measurement circuit 133. The measurement device 100 ensures that the power supply of the whole circuit control system 130 is in a normal state at any time, and simultaneously records the voltage and current values of the logging instrument, thereby being beneficial to monitoring the power consumption of each circuit part, ensuring that the collected data is obtained under a normal power supply environment, and simultaneously being capable of being used for adjusting and optimizing the power supply system of the measurement device 100.
In this embodiment, the clearance measurement circuit 131 is used to measure the borehole diameter and the clearance between the measurement device 100 and the borehole wall. The standoff measurement circuit 131 includes an ultrasonic caliper probe and a density measurement probe. The gap measuring circuit 131 measures the borehole diameter and the gap between the measuring apparatus 100 and the borehole wall by the ultrasonic probe, thereby adjusting the density value and the Pe (photoelectric absorption index) value obtained by the signal main amplification and energy spectrum acquisition module. In one embodiment, the ultrasonic hole diameter probe and the density measuring probe are arranged in the same axial direction, so that the fitting condition of the density probe and the well wall can be accurately detected, and lithology and density value compensation can be carried out.
According to the present invention, the azimuth measurement circuit 133 is used for division of the energy spectrum to measure azimuth information. The azimuth measurement circuit 132 divides the formation around the borehole into 16 sectors on average for measurement. Therefore, the borehole stratum is distributed with a sector signal phi a every 22.5 degrees, and the azimuth density imaging measurement of the stratum can be realized by combining the collected stratum lithology density data. Under the rotation measurement mode, each sector is obtained by a traditional density calculation formula, and the calculation process is as follows:
ρb＝ρa+Δρ
ρa＝AlnLSD+BlnSSD+C
Δρ＝DlnLSD+ElnSSD+F
ρc＝ρb+σ
wherein A is the long source distance counting rate vs density value rhoaB is the short source spacing count rate vs. density value rhoaC is the density value ρaD is the coefficient of contribution of the long-range count rate to the density correction value Δ ρ, E is the coefficient of contribution of the short-range count rate to the density correction value Δ ρ, F is the coefficient of deviation of the density correction value Δ ρ, σ is the gap correction coefficient, ρcThe corrected real density value.
In this embodiment, in the rotation measurement mode, each group of count values is measured, and a corresponding sector signal Φ a (a is 0-16) needs to be added, and then the true density value of the sector is calculated under the action of the gap compensation parameter.
According to the present invention, the acquisition control storage circuit 132 takes an FPGA (field programmable gate array) as a core. The power control circuit 134 supplies power to the whole acquisition control storage circuit, and the FPGA is connected with the high-voltage module through the high-voltage control circuit. The short-source-distance crystal detector 161 and the long-source-distance crystal detector 163 in the density detector short section 160 are connected with the preamplification circuit 171, and are connected with the FPGA through a pulse conditioning circuit, a peak detection circuit and an A/D conversion circuit, so that the received gamma ray signals scattered by the stratum are transmitted to the acquisition control storage circuit 132 for analysis and processing. Signals of the gap measurement circuit 131 and the azimuth measurement circuit 133 are synchronously sent to the acquisition control storage circuit 132 for processing, and the FPGA in the acquisition control storage circuit 132 is connected with the external power supply control circuit 134 through a modem and a bus isolation controller and is also connected to the memory RAM. Thus, the signals of the gap measuring circuit 131 and the azimuth measuring circuit 133 are analyzed and processed by the acquisition control storage circuit 132.
In accordance with the present invention, an axially extending wire guide (not shown) is also provided in the drill collar 110 for routing a signal bus to connect the circuitry in the measurement device 100 to the surface system. In one embodiment, the circuit boards in the circuitry of the measurement device 100 are mounted on the circuit frame 120 and are mounted in a combination of a porous and hermetic high temperature vibration-resistant adhesive.
According to the present invention, there is also provided a measuring method for measuring a formation density value, which is performed using the measuring apparatus 100 for measuring a formation density value according to the present invention. Fig. 6 shows a schematic control flow diagram of signal receiving, processing, collecting and storing of the measuring apparatus 100, and the flow of the measuring method is briefly described below with reference to the schematic flow diagram of the measuring apparatus 100.
First, the measurement device 100 is lowered into the wellbore and gamma rays are directed toward the surrounding formation by the radioactive elements within the density bin source 140. Meanwhile, the measurement device 100 is powered on, and thus the power control circuit 134 supplies power to the FPGA in the acquisition control storage circuit 132 under the action of the bus isolation controller and the modem. In the rotational measurement mode, the density detector sub 160 receives gamma rays scattered from the formation. Thereafter, the received gamma ray signal is subjected to signal processing by the pre-amplifier circuit 171 and the high voltage control circuit 172 in the signal transmission system 170. Under the action of the high-voltage control circuit 172, the output signal is subjected to the action of a pulse conditioning circuit, mainly to amplification, filtering, baseline restoration, threshold control and other processing of the signal, so as to output a signal meeting the requirements, and after being processed by the peak detection circuit and the AD conversion circuit, a gamma ray signal is obtained and is transmitted to the FPGA in the acquisition control storage circuit 132. Meanwhile, the measurement signals of the gap measurement circuit 131 and the azimuth measurement circuit 133 are transmitted to the FPGA of the acquisition control storage circuit 132 together for processing and data compression. The acquired signal parameters are then transferred to a memory. After the signal data to be uploaded is changed into a specific signal through a modem, the specific signal is transmitted to a ground system through a signal bus under the action of a bus isolation controller. And finally, obtaining the formation density value through correlation calculation.
The measurement device 100 for measuring formation density values according to the present invention is capable of directionally emitting gamma rays through the radioactive elements within the density bin source 140 into the surrounding formation. The density detector sub 160 receives gamma rays scattered by the formation and processes the gamma rays through the signal transmission system 170 to ensure the reliability of received signals, thereby improving the accuracy of the measurement result of the measurement device 100. In the well logging process, the fitting condition of the measuring device 100 and the well wall can be accurately judged through the azimuth measuring circuit 133 and the clearance measuring circuit 131 in the circuit control system 130, lithology and density value compensation is carried out, measurement parameters can be effectively corrected, the influence of environmental factors on the measurement result is reduced, accurate formation real information is obtained, and the accuracy of the measurement result of the measuring device 100 is effectively guaranteed. The azimuth measuring circuit 133 divides the borehole stratum into 16 different sectors through sector division of the energy spectrum to measure different azimuth information, and converts the lithology and density value of the stratum measured by the measuring device 100 into 360-degree imaging by combining sector signals. Therefore, lithology and density values in different orientations in the stratum can be accurately and effectively measured through orientation measurement, and the measurement accuracy of the measuring device 100 is obviously improved. In addition, the measuring device 100 has a simple structure, low circuit power consumption, safety and reliability. By measuring through the measuring device 100 for measuring the density value of the stratum, the lithology and the density value of the stratum can be accurately obtained, and the accuracy of the measuring result is high.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A measuring device for measuring formation density values, the measuring device comprising:
the drill collar (110) is internally provided with an axially-through eccentric flow channel (111), and the side wall of the drill collar, which is opposite to the eccentric flow channel, is provided with an axially-extending U-shaped groove (112);
the circuit framework (120) is arranged in the eccentric flow channel and is constructed into a cylindrical shape, an eccentric channel (121) which penetrates through the circuit framework in the axial direction is arranged in the circuit framework, a guide pipe (122) used for guiding drilling fluid is arranged in the eccentric channel, and a circuit control system (130) is arranged at the lower part of the circuit framework;
a density bin source (140) disposed in an upper portion of the U-shaped trough, wherein radioactive elements are disposed in the density bin source and gamma rays are emitted at a fixed angle toward the surrounding formation;
the density detector is characterized in that the pressure-bearing shell (150) is embedded in the U-shaped groove and is constructed into a cylindrical shape, a density detector short section (160) used for receiving gamma rays scattered by the stratum is arranged in the pressure-bearing shell, a signal transmission system (170) used for transmitting measured signal parameters of the gamma rays scattered by the stratum is arranged at the lower end of the density detector short section, and the signal transmission system is connected with the circuit control system so as to transmit the measured signals to the circuit control system, so that the stratum density value is obtained through calculation and analysis.
2. The measuring device according to claim 1, wherein the density detector sub comprises a short source distance crystal detector (161), a short source distance photomultiplier (162), a long source distance crystal detector (163) and a long source distance photomultiplier (164) which are arranged in the pressure-bearing housing from top to bottom in sequence for detecting a received signal.
3. The measurement device according to claim 2, wherein the signal transmission system comprises a pre-amplification circuit (171) and a high voltage control circuit (172) connected to the pre-amplification circuit, the pre-amplification circuit being connected to the short source distance crystal detector and the long source distance crystal detector, the high voltage control circuit being connected to the acquisition control storage circuit.
4. The measurement device of claim 1, wherein the circuit control system comprises: the device comprises a clearance measurement circuit (131) and an azimuth measurement circuit (133) which are used for correcting measurement parameters, wherein the clearance measurement circuit is used for measuring the diameter of a borehole and the clearance between the measurement device and the borehole wall, the azimuth measurement circuit is used for measuring azimuth information, the measurement circuit averagely divides the stratum around the borehole into 16 sector signals for measurement, an acquisition control storage circuit (132) which is used for processing the detected signals and is connected with the clearance measurement circuit and the azimuth measurement circuit, and a power supply control circuit (134) which is used for providing power supply voltage meeting requirements for the clearance measurement circuit, the acquisition control storage circuit and the azimuth measurement circuit.
5. A measurement device as claimed in claim 1, wherein the density bin source is disposed at an angle inclined to the central axis of the drill collar.
6. The measuring device according to claim 5, characterized in that the density bin source is surrounded by a shield (141) for absorbing scattered gamma rays, the shield being made of a tungsten-nickel-iron material.
7. A measuring device according to claim 1, characterized in that the pressure-bearing housing is connected to the circuit skeleton by means of a pressure-bearing plug (151).
8. A measuring device according to claim 7, characterized in that an anti-wear cover plate (180) is fixedly mounted on the drill collar radially on the outside thereof corresponding to the pressure-bearing housing, and a centralizing anti-wear cover plate (190) is provided on the drill collar radially on the outside thereof opposite to the anti-wear cover plate.
9. The measuring device according to claim 8, wherein a short source distance window (181) and a long source distance window (182) for receiving gamma rays scattered by the formation are respectively arranged on the regions of the wear cover plate corresponding to the short source distance crystal detector and the long source distance crystal detector, and the short source distance window and the long source distance window are both made of beryllium and/or titanium materials.
10. A method of measuring formation density values, using a measuring device according to any one of claims 1 to 9, comprising the steps of:
lowering the measurement device into the borehole and directionally emitting gamma rays through the radioactive elements within the density bin source into the surrounding formation;
receiving gamma rays scattered by the stratum through the short section of the density detector, processing received gamma ray signals through the signal transmission system, transmitting the processed gamma ray signals to the acquisition control storage circuit, and transmitting measurement signals of the gap measurement circuit and the azimuth measurement circuit to the acquisition control storage circuit;
the acquisition control storage circuit analyzes and processes the acquired signal parameters and transmits the signal parameters to the ground system to obtain the lithology and density value of the stratum through related calculation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114165214A (en) * | 2020-08-19 | 2022-03-11 | 中国石油化工集团有限公司 | Novel high-temperature high-pressure lithology density probe main body |
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| US5134285A (en) * | 1991-01-15 | 1992-07-28 | Teleco Oilfield Services Inc. | Formation density logging mwd apparatus |
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| CN114165214A (en) * | 2020-08-19 | 2022-03-11 | 中国石油化工集团有限公司 | Novel high-temperature high-pressure lithology density probe main body |
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