CN108930534B - Method and device for correcting temperature influence of nuclear magnetic resonance formation while drilling - Google Patents
Method and device for correcting temperature influence of nuclear magnetic resonance formation while drilling Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 153
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Abstract
The invention provides a method and a device for correcting the influence of the temperature of a nuclear magnetic resonance formation while drilling, wherein the device comprises the following components: the device comprises a constant temperature and constant pressure box, a rock container and a drilling rig, wherein the rock container is positioned in the constant temperature and constant pressure box; the rock container is a container implanted with N layers of artificial rocks manufactured by imitating surrounding rocks of underground strata, and each layer of artificial rocks of the rock container is internally provided with at least one first temperature sensor; and at least one second temperature sensor is arranged in the length direction of the drill rod of the drilling rig. Therefore, the method and the device for correcting the influence of the formation temperature by the nuclear magnetic resonance while drilling provided by the invention can measure the formation temperature in the radial direction of the rock stratum.
Description
Technical Field
The invention relates to an oil field drilling technology, in particular to a method and a device for correcting the influence of the temperature of a nuclear magnetic resonance formation while drilling.
Background
In the process of exploration and development of oil fields, formation temperature plays an important role in the generation, migration, aggregation and the like of oil and gas, and has non-negligible influence on the physical properties of oil, gas, water and rocks. Therefore, studying formation temperature may solve many key issues in petroleum geology and oil and gas exploration and development efforts.
In the prior art, the temperature of the underground formation is generally known through a well temperature logging (also called thermal logging) curve, and specifically comprises the following steps: the method comprises the steps that a logging instrument is installed on the drilling equipment, when the drilling equipment drills into a stratum, the downhole temperature measured by the logging instrument is obtained according to the temperature measured by the logging instrument and the following formula T (BHT-15) +15, the actual temperature of the stratum is obtained, BHT represents the temperature measured by the logging instrument, T represents the actual temperature of the stratum, K is a correction coefficient, and K varies with different regions and has close correlation with a ground temperature gradient.
However, the downhole temperature measured by the logging instrument by the method is the temperature near the borehole, and since the drilling fluid is injected into the borehole during the drilling process, the temperature of the drilling fluid reduces the temperature of the formation around the borehole, thereby affecting the downhole temperature measured by the logging instrument, and further reducing the accuracy of the actual temperature of the obtained formation.
Disclosure of Invention
The invention provides a method and a device for correcting the influence of formation temperature by nuclear magnetic resonance while drilling, which are used for solving the technical problem that the underground temperature measured by a logging instrument is the temperature around a borehole and cannot penetrate into the radial direction of the formation to measure the formation temperature in the prior art.
In a first aspect of the invention, there is provided a device for correcting the effects of temperature in a nuclear magnetic resonance while drilling formation, the device comprising: the device comprises a constant temperature and constant pressure box, a rock container and a drilling rig, wherein the rock container is positioned in the constant temperature and constant pressure box; the rock container is a container implanted with N layers of artificial rocks manufactured by imitating surrounding rocks of underground strata, and each layer of artificial rocks of the rock container is internally provided with at least one first temperature sensor; and at least one second temperature sensor is arranged in the length direction of the drill rod of the drilling rig.
The drill rig is for drilling into the rock container from above the rock container.
The first temperature sensor is used for detecting the temperature of the artificial rock during the drilling process of the drilling machine.
The second temperature sensor is configured to detect a temperature of a wellbore drilled by the drill rig in the rock container during drilling of the drill rig.
Wherein the temperature detected by the first temperature sensor and the temperature detected by the second temperature sensor are used to correct the actual temperature of the formation.
Optionally, the rock container is located at the center of the constant temperature and pressure box, and the rock container and the constant temperature and pressure box are not in contact with each other.
In a possible embodiment, the drill is adapted to drill into the rock container from just above the centre of the rock container.
In a possible embodiment, the constant temperature and constant pressure box comprises a temperature compensation device, and the temperature compensation device is used for performing temperature correction when the temperature of the constant temperature and constant pressure box is different from the preset temperature by a first preset value.
In a possible embodiment, the constant temperature and pressure tank comprises a pressure compensation device for performing pressure correction when the pressure of the constant temperature and pressure tank is different from the preset pressure by a second preset value.
In one possible embodiment, the artificial rock of each layer has lithological properties of rock of the corresponding layer of the downhole formation.
In a possible embodiment, the thermostatted and constant pressure tank is cylindrical and the rock container is cylindrical.
In one possible embodiment, the drill comprises a drill bit and a drill rod, wherein the drill rod is a hollow cylindrical rod.
The cross-sectional area of the borehole drilled by the drill bit is greater than the cross-sectional area of the drill pipe.
During drilling of the drill string, drilling fluid is injected from within the hollow cylindrical shaft of the drill string and returns through a space between a wall of a borehole drilled by the drill bit and the drill string.
In a possible embodiment, at least one first temperature sensor is arranged in the radial direction of each layer of artificial rock of the rock container.
The second aspect of the invention provides a method for correcting the temperature influence of the nuclear magnetic resonance formation while drilling, which is applied to the device for correcting the temperature influence of the nuclear magnetic resonance formation while drilling according to the first aspect of the invention.
The method comprises the following steps:
The temperature sensor is used for acquiring a first temperature detected by the first temperature sensor and a second temperature detected by the second temperature sensor during the drilling process of the drilling machine;
And determining the corresponding relation between the simulated detection temperature of the stratum and the simulated detection temperature of the borehole when the drilling rig drills into the stratum according to the first temperature and the second temperature.
In one possible embodiment, when actually drilling the formation, the actual temperature of the formation is determined based on the correspondence and the actual detected temperature of the drilled wellbore.
According to the correction method and device for the temperature influence of the formation by nuclear magnetic resonance while drilling, provided by the invention, the temperature sensors are arranged on the artificial rock layers at different radial depths, so that not only can the simulated detection temperature of the borehole be obtained, but also the simulated detection temperature of the formation at different radial depths of the rock layers at the corresponding borehole depth position can be obtained in the simulated drilling process, and thus, the corresponding relation between the simulated detection temperature of the borehole and the simulated detection temperature of the formation can be obtained. Because the temperature inside the rock stratum is slightly influenced by the temperature of the drilling fluid, in actual logging, according to the depth and temperature information of the borehole obtained in actual logging, the temperature information of the stratum in actual logging can be obtained through the relationship between the temperature of the borehole and the temperature of the rock stratum at the corresponding borehole depth position on different radial depths, the temperature information can completely represent the real temperature information of the stratum to a certain extent, the method can be applied to calculating relevant stratum parameters, and the accuracy of logging and calculating the stratum parameters can be improved to a certain extent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a complete simulated drilling apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a first temperature sensor distribution in an artificial rock formation according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of a constant temperature and pressure tank according to an embodiment of the present invention;
FIG. 4 is a schematic view of a rock container according to an embodiment of the invention;
FIG. 5 is a cross-sectional view of a drill pipe and wellbore in accordance with an embodiment of the present invention;
FIG. 6 is a schematic flow chart of a method for correcting the effect of temperature of a nuclear magnetic resonance formation while drilling provided by the present invention.
Description of the symbols:
1: a constant temperature and pressure box;
2: a rock container;
3: a drilling rig;
4: a first temperature sensor;
5: a drill stem;
6: a gap between the drill pipe and a wall of the borehole;
7: a wellbore.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Concepts used in this application and their explanations:
Simulated detection temperature of the formation: the temperature measured on the artificial rock layer using the device in this application is simulated during drilling.
Simulated detection temperature of the borehole: the temperature in the wellbore measured using the apparatus of the present application while simulating drilling.
Actual detected temperature of the wellbore: in actual logging, a temperature sensor on the logging instrument measures the temperature in the wellbore.
Actual temperature of the formation: in actual logging, the temperature of the formation cannot be measured by the temperature sensor on the logging instrument.
In the prior art, the temperature of the underground formation is generally known through a well temperature logging (also called thermal logging) curve, and specifically comprises the following steps: the method comprises the steps that a logging instrument is installed on the drilling equipment, when the drilling equipment drills into a stratum, the logging instrument measures downhole temperature, the actual temperature of the stratum is obtained according to the temperature measured by the logging instrument and the following formula T (BHT-15) +15, the BHT represents the temperature measured by the logging instrument, the T represents the actual temperature of the stratum, the K is a correction coefficient, and the K varies with different regions and has close correlation with a ground temperature gradient.
However, the downhole temperature measured by the logging tool by the method is the temperature near the borehole, and since the drilling fluid is injected into the borehole during the drilling process, the temperature of the drilling fluid reduces the temperature around the borehole, thereby affecting the downhole temperature measured by the logging tool, and further reducing the accuracy of the actual temperature of the obtained formation.
In view of the above problems, the present invention provides a device for correcting the effect of temperature of a nuclear magnetic resonance formation while drilling, which obtains temperature information on the radial depth of artificial rocks during a simulated drilling process by providing a temperature sensor on the radial depth of each layer of artificial rocks.
The technical solution of the present invention will be described in detail by specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a schematic structural diagram of a complete simulated drilling device according to an embodiment of the present invention. As shown in fig. 1, the apparatus for correcting the effect of temperature of a nuclear magnetic resonance formation while drilling provided by the present invention comprises: a constant temperature and pressure box 1, a rock container 2 and a drilling rig 3. Wherein the rock container 2 is positioned in the constant temperature and pressure box 1.
In the simulated drilling process, the environment where the rock container 2 is located is ensured to be consistent with the actual formation environment, so that the accuracy of the obtained temperature data is ensured, and the temperature and the pressure set in the constant-temperature constant-pressure box 1 are the actual temperature and the pressure in the actual formation where the underground formation surrounding rock is located.
In order to ensure that the temperature data obtained by the simulation device can reflect the real situation more accurately, physical properties of a large amount of rocks collected from the stratum in actual drilling and logging work can be researched, N layers of artificial rocks with physical properties consistent with those of the surrounding rocks of the underground stratum are artificially manufactured, and the N layers of artificial rocks are implanted into the rock container 2. At the same time, at least one first temperature sensor 4 (not shown in fig. 1) is arranged on each layer of artificial rock.
The drilling machine 3 comprises two parts, a drill bit and a drill rod. The drill rig 3 is adapted to drill from above the rock container 2 into said rock container 2 and the drill bit on the drill rig 3 is optionally rotated so as to change the drilling direction of the drill rig 3. In the process of manufacturing the artificial rock, a drilling path which can be passed by the drilling machine 3 needs to be reserved for the drilling machine 3, and the artificial rock core does not place the first temperature sensor 4 on the drilling path which can be passed by the drilling machine 3. Meanwhile, at least one second temperature sensor and a pressure measuring instrument corresponding to each second temperature sensor are arranged in the length direction of the drill rod of the drilling device 3. Since different formation depths in the artificial rock correspond to different formation pressures, the formation depths can be characterized by the pressures, so that the depth information of the artificial rock at which the temperature is measured by the second temperature sensor is obtained by using the pressure measuring instrument.
A first temperature sensor 4 for detecting temperature information of the artificial rock during drilling of the drilling machine 3; a second temperature sensor for detecting the temperature of the borehole drilled by the drilling rig 3 in the rock container during drilling of the drilling rig 3.
Wherein the temperature detected by the first temperature sensor 4 and the temperature detected by the second temperature sensor are used to correct the actual temperature of the formation.
Optionally, in the device for correcting the influence of the temperature of the nuclear magnetic resonance formation while drilling provided by the invention, in order to ensure stable temperature and pressure of the artificial rock in the rock container 2, when the rock container 2 is fixed inside the constant temperature and pressure box 1, the constant temperature and pressure box 1 and the rock container 2 are not in contact with each other.
In some embodiments of the invention, the drill is adapted to drill into the rock container 2 from just above the centre of the rock container 2.
In some embodiments of the present invention, in order to ensure that the drilling process of the whole drilling machine 3 can simulate the real drilling process more accurately, the temperature in the constant temperature and pressure tank 1 needs to be kept the same as the temperature (i.e. the preset temperature) of the real underground formation surrounding rock corresponding to the artificial rock, so the temperature compensation device is arranged in the constant temperature and pressure tank 1. The temperature compensation device is used for carrying out temperature correction when the temperature of the constant temperature and constant pressure box 1 is different from the preset temperature by a first preset value, namely when the temperature in the constant temperature and constant pressure box 1 is higher than or lower than the first preset value of the preset temperature, the temperature compensation device adjusts the temperature in the constant temperature and constant pressure box 1, so that the difference value between the adjusted temperature in the constant temperature and constant pressure box 1 and the preset temperature is in the first preset value. The size of the first preset value is not limited, for example, the first preset value can be 0.1 ℃ and 0.2 ℃, and the specific size can be selected according to actual needs.
Meanwhile, the pressure in the constant temperature and pressure box 1 meets the requirement that the pressure (namely the preset pressure) of the real underground formation surrounding rock corresponding to the artificial rock is the same, so that a pressure compensation device is arranged in the constant temperature and pressure box 1. The pressure compensation device is used for carrying out temperature correction when the pressure of the constant temperature and constant pressure box 1 is different from the preset pressure by a first preset value, namely when the pressure in the constant temperature and constant pressure box 1 is higher than or lower than a second preset value of the preset pressure, the pressure compensation device adjusts the pressure in the constant temperature and constant pressure box 1, so that the difference value between the adjusted pressure in the constant temperature and constant pressure box 1 and the preset pressure is in the second preset value. The second preset value is not limited by the present application, for example, the second preset value may be 10pa or 15pa, and the specific size may be selected according to actual needs.
In some embodiments of the invention, the artificial rock of each layer has lithological properties of rock of the corresponding layer of the downhole formation. Because the artificial rock is artificially simulated according to the physical properties of the real stratum, and the physical properties of stratum rocks at different depths in the real stratum are different, the artificial rock of each layer is manufactured according to the physical properties of rocks of corresponding layers, so that the artificial rock can be closer to the physical properties of the rocks of the corresponding layers in the real stratum, and the data obtained in the final simulated drilling can be more accurate. For example: the real strata are rock layer a, rock layer b, rock layer c, rock layer d, etc. in this order from the upward direction, and the rock container 2 is provided with artificial rock having rock properties of rock layer a, artificial rock having rock properties of rock layer b, artificial rock having rock properties of rock layer c, artificial rock having rock properties of rock layer d, etc. in this order from the upward direction.
FIG. 2 is a schematic cross-sectional view of a first temperature sensor distribution in an artificial rock formation according to an embodiment of the invention. In an embodiment of the device for correcting the temperature influence of the nuclear magnetic resonance while drilling formation provided by the invention, as shown in fig. 2, at least one first temperature sensor 4 is arranged in the radial direction of each layer of artificial rock of the rock container. Preferably, because the temperature of the area on the artificial rock close to the borehole varies significantly for the same layer of artificial rock due to the inflow of the drilling fluid during the drilling process of the drilling machine, compared with the temperature of other areas, when the first temperature sensor 4 is installed on the radial depth of the same layer of artificial rock, the principle that the installation density of the first temperature sensor 4 is gradually sparse in the radial depth of each layer of artificial rock when the borehole is taken as the origin and the artificial rock extends in the radial direction is followed.
Fig. 3 is a schematic structural view of a constant temperature and pressure tank according to an embodiment of the present invention. As shown in FIG. 3, in the correction device for the formation temperature influence of nuclear magnetic resonance while drilling, the constant temperature and pressure box 1 is in the shape of a cylinder, such as a rectangular parallelepiped or a cylinder.
Fig. 4 is a schematic view of a rock container according to an embodiment of the invention. In the device for correcting the temperature influence of the formation by nuclear magnetic resonance while drilling, the rock container 2 is in the shape of a cylinder, for example, a rectangular parallelepiped or a cylinder. As shown in fig. 4, for the rock container 2, in order to ensure that the temperature measured by at least one first temperature sensor at the same radial depth from the central position of the artificial rock on each layer of the artificial rock in the rock container 2 is within an allowable error range, the rock container 2 is preferably cylindrical.
The well drilling device 3 is manufactured by scaling down according to real well drilling equipment, and the well drilling device 3 comprises a drill bit and a drill rod. Wherein the drill bit of the drill rig 3 is used to break rock in the formation, forming a borehole. The drill pipe of the drill rig 3 is a hollow cylindrical pipe for injecting drilling fluid into the borehole during drilling.
FIG. 5 is a cross-sectional view of a drill pipe and wellbore in accordance with an embodiment of the present invention. As shown in fig. 5, the cross-sectional area of the drill string is smaller than the cross-sectional area of the borehole 7 drilled by the drill head of the drill rig 3, so that a space 6 exists between the drill string of the drill rig 3 and the wall of the borehole 7 drilled by the drill rig 3. During drilling of the drill string 3, drilling fluid is injected from within the hollow cylindrical rod 5 of the drill string and returns through the space 6 between the wall of the borehole 7 and the drill string.
In particular, during the drilling of the drilling device 3, the drill bit of the drilling device 3 needs to break rock in the formation, so rock fragments are generated, which prevent the drill bit of the drilling device 3 from continuing to drill, so that during the drilling of the drilling device 3, drilling fluid needs to be injected to carry out the rock fragments. Wherein drilling fluid, which may contain a large amount of rock cuttings, is injected from within the hollow cylindrical rod 5 of the drill pipe of the drilling rig 3 to the drill bit of the drilling rig 3 and thus into the borehole 7. Because the pressure at the deeper part of the stratum is greater than the pressure of the stratum above the deeper part of the stratum, the drilling fluid in the borehole 7 flows out of the borehole along the gap 6 between the drill pipe of the drilling machine 3 and the wall of the borehole 7 drilled by the drilling machine 3 under the action of the pressure difference, and rock debris flows out along with the drilling fluid, so that the aim of cleaning the borehole is fulfilled. The drilling fluid can be clear water, drilling fluid, clay-phase-free flushing fluid, emulsion and the like, and is selected according to actual needs.
After the drilling fluid enters the borehole 7, the temperature of the drilling fluid is lower than that of the artificial rock, so that the temperature of the drilling fluid can lower the temperature of the stratum around the borehole 7, and the temperature measured by the second temperature sensor cannot truly reflect the temperature of the stratum. Meanwhile, the drilling fluid gradually invades into the artificial rock along the radial direction, and influences the temperature of the artificial rock along the radial direction. However, the drilling fluid does not invade into the artificial rock in a large amount, so that the temperature in the artificial rock is less influenced by the temperature of the drilling fluid, and therefore, the temperature measured by the first temperature sensor arranged in the radial direction of the artificial rock is closer to the actual formation temperature.
By utilizing the correction device for the temperature influence of the nuclear magnetic resonance formation while drilling, not only can the temperature information on the radial depth of the artificial rock be obtained, but also the dynamic temperature information on the radial depth of the artificial rock can be obtained, thereby providing more accurate information for the exploration and exploitation of oil fields.
The following describes a method for correcting the influence of the temperature of the nuclear magnetic resonance formation while drilling, which is provided by the present invention, based on the apparatus for correcting the influence of the temperature of the nuclear magnetic resonance formation while drilling.
FIG. 6 is a schematic flow chart of a method for correcting the effect of temperature of a nuclear magnetic resonance formation while drilling provided by the present invention. As shown in fig. 6, the method includes:
S101, in the drilling process of the drilling machine, a first temperature detected by the first temperature sensor and a second temperature detected by the second temperature sensor are obtained.
In particular, when the drilling rig 3 is put into operation, a first temperature sensor 4 in each layer of artificial rock in the rock container 2 and a second temperature sensor on the drill pipe of the drilling rig 3 are switched on. Meanwhile, the first temperature sensor 4 starts to measure the temperature information of the artificial rock at different radial depths and transmits the temperature information to the computer; the second temperature sensor begins measuring temperature information in the borehole and transmits to the computer.
During the drilling of the drilling machine 3, the first temperature sensors arranged on each layer of the artificial rock transmit the temperature of the layer at different radial depths of the layer to the calculator in real time. Each second temperature sensor provided on the drilling rig 3 transmits the temperature of the borehole in which it is located to the calculator. Meanwhile, the pressure measuring instrument detects the pressure of the position of the second temperature sensor in the borehole and transmits the pressure to the computer. The computer records the time at which the drill rig 3 reaches each layer of artificial rock.
E.g. at the depth h of the drill rig 3 to the artificial rock 0In the process, the computer records the arrival h of the drilling rig 3 0Time of arrival h 0The pressure measurement device on the drilling rig 3 transmits pressure information to the computer. The well drilling device 3 is positioned at h 0The second temperature sensor measures the temperature in the wellbore at that time and transmits the temperature to the computer. At the same time, the corresponding depth h on the artificial rock 0A first temperature sensor on the artificial rock layer measures the temperature at different radial depths of the layer and transmits the temperature information to a computer.
During the further downward drilling of the drilling machine 3, the second temperature sensor located in the length direction of the drill rod of the drilling machine 3 will reach h in turn 0To (3). When one of the second temperature sensors reaches h 0When the pressure side measuring instrument corresponding to the second temperature sensor detects that the second temperature sensor reaches h 0The second temperature sensor measures h in the borehole at that time 0And transmitted to the computer. In addition, the temperature of the artificial rock at the radial depth can also change due to the invasion of the drilling fluid to the artificial rock in the radial direction, the temperature change is different according to the invasion degree of the drilling fluid, and the temperature of the artificial rock at different radial depths is measured in real time by using the first temperature sensor 4 in each layer of the artificial rock and is transmitted to the computer. At the same time, the computer records the time of the drilling fluid invasion on the layer of artificial rock.
Before step S101, the method further includes fixing the rock container 2 filled with the artificial rock in the constant temperature and pressure box 1 with set temperature and pressure, and then closing the constant temperature and pressure box 1. The rock container 2 is placed in the constant temperature and pressure box 1 for a period of time, so that the internal and external temperature and pressure of the artificial rock are consistent, namely consistent with the real formation temperature and pressure. Then, a small hole is formed in the constant temperature and pressure box 1, and the drilling device 3 can enter the small hole.
S102, taking the first temperature as the simulated detection temperature of the stratum, taking the second temperature as the simulated detection temperature of the borehole, and determining the corresponding relation between the simulated detection temperature of the stratum and the simulated detection temperature of the borehole when the drilling rig drills into the stratum according to the first temperature and the second temperature.
Specifically, firstly, the first temperature on each layer of the artificial rock, which is measured by the first temperature sensor and corresponds to different radial depths, and the second temperature in the borehole, which is measured by the second temperature sensor and corresponds to different depths, which are collected by the computer are artificially screened, that is, temperature data which is not valuable to the result in the first temperature and the second temperature is deleted. Such as a second temperature measured by the second temperature sensor that has not entered the borehole when the drilling rig 3 has just started to drill, a first temperature and a second temperature measured radially after the green house when the temperature of the drilling fluid no longer affects the borehole temperature and the artificial rock layer, etc.
The computer then collates the various data obtained and collates the second temperature and the first temperature according to the depth of the borehole and the radial depth of the artificial rock layer corresponding to the depth of the borehole.
And finally, under the condition that the depths of the boreholes are the same and the radial depths of the artificial rock layers corresponding to the depths of the boreholes are the same, establishing a temperature correction plate according to the data obtained by the computer, wherein the temperature correction plate is a three-dimensional rectangular coordinate system. Wherein the X-axis is the simulated sensed temperature of the borehole, i.e., the second temperature. The Y-axis is the simulated sensed temperature of the formation, i.e., the first temperature, where the first temperature is the average of the temperatures measured by all of the first temperature sensors at the same radial depth on each layer of artificial rock when there are at least two first temperature sensors at that radial depth. The Z-axis represents time and when the drill rig 3 reaches a certain depth of artificial rock the drilling fluid will have an effect on the temperature in the borehole at that depth and over time the effect of the drilling fluid on the temperature in the borehole at that depth will gradually decrease, i.e. the X-axis and Z-axis represent the curves of the simulated detected temperature of the borehole over time. Meanwhile, the drilling fluid invades on each layer of artificial rock along the radial direction, so the temperature of the drilling fluid also influences the temperature on the radial depth of the artificial rock layer, and the invasion degree of the drilling fluid in the radial direction is different, and the influence change degree is different. At the same time, the effect of the drilling fluid on the temperature at different radial depths is gradually reduced over time, i.e., the Y-axis and Z-axis represent the simulated detection temperature of the formation as a function of time. Thus, a temperature correction chart corresponding to the correspondence between the simulated detection temperature of the formation and the simulated detection temperature of the borehole at any depth of the borehole and at any radial depth is obtained. Meanwhile, the relation between the simulated detection temperature of the borehole of any borehole depth and the time and the relation between the simulated detection temperature of the stratum at different radial depths and the time can be obtained through the temperature correction chart.
The method of the embodiment further comprises the following steps: and when the stratum is actually drilled, determining the actual temperature of the stratum according to the corresponding relation and the actual detection temperature of the borehole. During actual drilling, the temperature measuring instrument cannot measure the temperature in the radial direction of the stratum, and only can obtain the actual detection temperature of the borehole. And because the temperature of the borehole is influenced by the temperature of the drilling fluid, the obtained actual detected temperature of the borehole is greatly different from the actual temperature of the formation, and therefore the obtained actual detected temperature of the borehole cannot be used for representing the actual temperature of the formation.
So that when actually drilling, the actual detected temperature of the borehole can be obtained, which corresponds to the simulated detected temperature of the borehole on the temperature correction chart. Therefore, under the condition that the depth of the borehole is determined, according to the actual detection temperature of the borehole, the simulated detection temperature of the only one stratum corresponding to different radial depths can be obtained on the temperature correction chart. Because the influence of the temperature of the drilling fluid on the radial temperature of the stratum is small, the simulated detection temperature of the stratum obtained on the temperature correction chart can completely represent the actual temperature of the stratum to a certain extent. Meanwhile, on the temperature correction chart, the law of the actual detection temperature of the borehole changing along with the time and the law of the actual temperature of the stratum changing along with the time at different radial depths can be seen.
According to the actual measured temperature of the borehole, the simulated detection temperature of the stratum which is very close to the actual temperature of the stratum is obtained through the temperature correction chart, and the parameters such as the porosity of the stratum are calculated by utilizing the detection temperature of the stratum, so that the accuracy of the parameters can be improved. Meanwhile, a measuring instrument used during drilling is adjusted according to the detection temperature of the stratum, and the accuracy of logging is improved. According to the rule that the simulated detection temperature of the borehole and the simulated detection temperature of the stratum displayed on the temperature correction chart respectively change along with time, more accurate logging information can be obtained, such as information of oil-water relative permeability, fluid characteristics in rocks and the like, so that more accurate information is provided for oil field exploration and development.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (11)
1. A correction device for nuclear magnetic resonance while drilling formation temperature influence is characterized by comprising: the device comprises a constant temperature and constant pressure box, a rock container and a drilling rig, wherein the rock container is positioned in the constant temperature and constant pressure box; the rock container is a container implanted with N layers of artificial rocks manufactured by imitating surrounding rocks of underground strata, and each layer of artificial rocks of the rock container is internally provided with at least one first temperature sensor; at least one second temperature sensor is arranged in the length direction of a drill rod of the drilling rig; the temperature and the pressure set in the constant temperature and constant pressure box are the actual temperature and the actual pressure in the real stratum where the underground stratum surrounding rock is located;
The drill rig is used for drilling from above the rock container to the rock container;
The first temperature sensor is used for detecting the temperature of the artificial rock during the drilling process of the drilling machine;
The second temperature sensor is used for detecting the temperature of a borehole drilled by the drilling machine in the rock container during the drilling process of the drilling machine;
Wherein the temperature detected by the first temperature sensor and the temperature detected by the second temperature sensor are used to correct the actual temperature of the formation.
2. The apparatus of claim 1, wherein the rock container is located at the very center of the oven, and the rock container and the oven are not in contact with each other.
3. The apparatus of claim 1 or 2, wherein the drill is adapted to drill into the rock container from just above the centre of the rock container.
4. The device according to claim 1 or 2, wherein the constant temperature and pressure tank comprises a temperature compensation device for performing temperature correction when the temperature of the constant temperature and pressure tank differs from a preset temperature by a first preset value.
5. The device according to claim 1 or 2, wherein the constant temperature and pressure tank comprises a pressure compensation device for performing pressure correction when the pressure of the constant temperature and pressure tank is different from a preset pressure by a second preset value.
6. An apparatus according to claim 1 or 2, wherein the artificial rock of each layer has petrophysical properties of the rock of the corresponding layer of the downhole formation.
7. The apparatus of claim 1 or 2, wherein the thermostatted constant pressure tank is cylindrical and the rock container is cylindrical.
8. The apparatus of claim 1 or 2, wherein the drill comprises a drill bit, wherein the drill bit is a hollow cylindrical rod;
The cross-sectional area of the borehole drilled by the drill bit is larger than that of the drill rod;
During drilling of the drill string, drilling fluid is injected from within the hollow cylindrical shaft of the drill string and returns through a space between a wall of a borehole drilled by the drill bit and the drill string.
9. An apparatus according to claim 1 or 2, characterized in that at least one first temperature sensor is arranged in the radial direction of each layer of artificial rock of the rock container.
10. A method for correcting the influence of the temperature of a nuclear magnetic resonance formation while drilling, which is applied to the device for correcting the influence of the temperature of the nuclear magnetic resonance formation while drilling according to any one of claims 1 to 9;
The method comprises the following steps:
The temperature sensor is used for acquiring a first temperature detected by the first temperature sensor and a second temperature detected by the second temperature sensor during the drilling process of the drilling machine;
And determining the corresponding relation between the simulated detection temperature of the stratum and the simulated detection temperature of the borehole when the drilling rig drills into the stratum according to the first temperature and the second temperature.
11. The method of claim 10, further comprising:
And when the stratum is actually drilled, determining the actual temperature of the stratum according to the corresponding relation and the actual detection temperature of the drilled well hole.
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