CN110130876B - Device and method for detecting orientation of underground fault casing head - Google Patents
Device and method for detecting orientation of underground fault casing head Download PDFInfo
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- CN110130876B CN110130876B CN201910388510.3A CN201910388510A CN110130876B CN 110130876 B CN110130876 B CN 110130876B CN 201910388510 A CN201910388510 A CN 201910388510A CN 110130876 B CN110130876 B CN 110130876B
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/024—Determining slope or direction of devices in the borehole
Abstract
The invention discloses a device and a method for detecting the orientation of an underground faulted casing head, wherein the device comprises: the system comprises a probe, an armored cable, a ground interface box, computing equipment and a power supply; the power supply supplies power to the computing equipment and the ground interface box; the detection pipe is connected with the ground interface box through an armored cable, is placed in an open hole section of the faulted cased well from below through the armored cable, is used for collecting environmental data at the position of the underground detection pipe, and is transmitted to the ground interface box through the armored cable; the ground interface box is connected with the computing equipment and used for transmitting the environment data to the computing equipment; the computing device is configured to determine an azimuth angle of the faulted casing head relative to the upper wellbore based on the environmental data and local geomagnetic data for the faulted casing well. The method can accurately determine the azimuth angle of the faulted casing head (particularly the large-displacement faulted casing head) relative to the upper borehole, and is favorable for improving the success rate of repairing the faulted casing.
Description
Technical Field
The invention relates to the field of underground resource drilling and production engineering, in particular to a device and a method for detecting the orientation of an underground fault casing head.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
The casing pipe is the necessary production equipment in the oil field development process. In the drilling and completion or production process, on one hand, the function of supporting the well wall is achieved; and on the other hand, functions to connect the ground to the underground (e.g., input of water above the ground into the ground or output of oil and gas below the ground out of the ground). Once the casing is damaged, not only the normal production of the casing damage well and the stability of the well wall can be influenced, but also the injection-production ratio and the formation pressure in the area near the casing damage well can be abnormal, so that the implementation of the stable production and development scheme of the whole oil field is seriously influenced. With the extension of oil field development time, the problem of casing damage has become a key and difficult problem affecting oil field production.
Casing damage (casing damage for short) mainly comprises: the sleeve pipe is out of shape and the sleeve pipe breaks, wherein the sleeve pipe breaks and can influence the downhole operation tool to be incapable of normally running down, and the oilfield production is seriously influenced. In the well repair construction in the past year, the repair of a large-displacement fault broken casing is always a technical problem in the field of well repair. Aiming at the problems of instability, easy loss, low success rate of channel finding and poor timeliness of a large-displacement active faulted casing head, the prior art generally adopts a scheme of finding (faulted casing head), then stabilizing (faulted casing head) and then beating (channel). At present, the main reason that the repair success rate of the large-displacement fractured casing is low is that the orientation of the fractured casing head relative to the upper well hole cannot be accurately obtained, so that the fractured casing head cannot be found.
In view of this, in well repair construction, how to accurately obtain the orientation of the faulted casing head relative to the upper wellbore in a short time is a technical problem which needs to be solved at present.
Disclosure of Invention
The embodiment of the invention provides an underground fractured casing head azimuth detection device, which is used for solving the technical problem that the existing fractured casing head azimuth prediction method is low in precision in fractured casing repair engineering, and comprises the following steps: the system comprises a probe, an armored cable, a ground interface box, computing equipment and a power supply; the power supply supplies power to the computing equipment and the ground interface box; the detection pipe is connected with the ground interface box through an armored cable, is placed in an open hole section of the faulted cased well from below through the armored cable, is used for collecting environmental data at the position of the underground detection pipe, and is transmitted to the ground interface box through the armored cable; the ground interface box is connected with the computing equipment and used for transmitting the environment data to the computing equipment; the computing equipment is used for determining the azimuth angle of the fault casing head relative to the upper borehole according to the environment data and the geomagnetic data of the local fault casing well; the open hole section is an open hole section which is controlled by a drilling tool to be lowered to the position of the fault position of the inner sleeve of the fault cased hole and drilled at a preset distance along the direction of the upper well hole; the environmental data includes: the well inclination angle and the well inclination azimuth angle at the position of the underground exploring tube, the triaxial magnetic field intensity of a magnetic field, the triaxial component of the gravity acceleration and the roll angle of the exploring tube; the geomagnetic data includes: the magnetic induction intensity, the magnetic inclination angle and the magnetic declination angle of the geomagnetic field;
wherein the computing device is further configured to determine an azimuth angle of the faulted casing head relative to the upper wellbore by:
wherein A isNRIndicating an azimuth of the upper wellbore; b iscEAnd BcNAre respectively BchProjections on an E-axis and an N-axis, the E-axis pointing east and the N-axis pointing north;
wherein, Bch＝Bh-Beh；
Wherein, BhDetermining environmental data collected by the probe; b isehDetermined by the geomagnetism data of the faulted cased hole location.
The embodiment of the invention also provides a method for detecting the orientation of the underground faulted casing head, which is used for solving the technical problem that the existing method for predicting the orientation of the faulted casing head has low precision in the faulted casing repairing engineering and comprises the following steps: controlling the drilling tool to be lowered to the position of the dislocation position of the inner sleeve of the dislocation cased well, and drilling an open hole section with a preset distance along the direction of the upper well hole; the control drilling tool takes out to control the armoured cable and transfer the probe to the open hole section, gather the environmental data of probe position department in the pit by the probe, wherein, environmental data includes: the well inclination angle and the well inclination azimuth angle at the position of the underground exploring tube, the triaxial magnetic field intensity of a magnetic field, the triaxial component of the gravity acceleration and the roll angle of the exploring tube; receiving environmental data acquired by a probe through an armored cable; determining an azimuth angle of the faulted casing head relative to the upper wellbore from the environmental data and local geomagnetic data for the faulted casing well, wherein the geomagnetic data comprises: the magnetic induction intensity, the magnetic inclination angle and the magnetic declination angle of the geomagnetic field;
wherein, according to environmental data and the local earth magnetism data of the broken casing well, confirm the azimuth angle of the broken casing head relative to the upper borehole, include: the azimuth of the faulted casing head relative to the upper wellbore is determined by the following equation:
wherein A isNRIndicating an azimuth of the upper wellbore; b iscEAnd BcNAre respectively BchProjection on E-and N-axesThe E axis points to the east and the N axis points to the north;
wherein, Bch＝Bh-Beh；
Wherein, BhDetermining environmental data collected by the probe; b isehDetermined by the geomagnetism data of the faulted cased hole location.
The embodiment of the invention also provides computer equipment for solving the technical problem that the existing fault casing head orientation prediction method is low in precision in the fault casing repair project, the computer equipment comprises a memory, a processor and a computer program which is stored in the memory and can be operated on the processor, and the processor realizes the underground fault casing head orientation detection method when executing the computer program.
The embodiment of the invention also provides a computer readable storage medium for solving the technical problem that the existing fault casing head position prediction method is low in precision in the fault casing repair project, and the computer readable storage medium stores a computer program for executing the underground fault casing head position detection method.
In the embodiment of the invention, the environmental data at the position of the underground probe is collected through the probe which is placed in the open hole section of the faulted cased hole, and the azimuth angle of the faulted casing head relative to the upper borehole is determined by combining the local geomagnetic data of the faulted cased hole, so that scientific basis is provided for searching for the large-displacement faulted casing head. The environmental data collected by the probe tube comprises a well inclination angle, a well inclination azimuth angle, a three-axis magnetic field intensity of a magnetic field, a three-axis component of gravity acceleration and a roll angle of the probe tube at the position of the underground probe tube; the local geomagnetic data of the fractured cased hole comprises: the magnetic induction intensity, the magnetic dip angle and the magnetic declination angle of the geomagnetic field.
By the embodiment of the invention, the azimuth angle of the faulted casing head (especially the large-displacement faulted casing head) relative to the upper borehole can be accurately determined, the problem of large prediction error of the azimuth angle of the faulted casing head relative to the upper borehole in the existing faulted casing repairing technology is solved, and the success rate of faulted casing repairing is favorably improved.
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. In the drawings:
FIG. 1 is a schematic view of an apparatus for detecting an orientation of a casing head in a borehole according to an embodiment of the present invention;
fig. 2 is a schematic arrangement diagram of a triaxial gyro sensor, a triaxial acceleration sensor and a triaxial fluxgate sensor inside a probe according to an embodiment of the present invention, along an axial direction;
FIG. 3 is a schematic representation of a computational model for determining the orientation of a downhole fractured casing head relative to an upper wellbore provided in an embodiment of the present invention;
fig. 4 is a flowchart of a method for detecting an orientation of a downhole casing head according to an embodiment of the present invention.
Reference numerals:
1. a casing string; 2. the casing head is broken; 3. an open hole section; 4. a probe tube; 5. an armored cable; 6. a ground interface box; 7. a computing device; 41. a three-axis gyro sensor; 42. a three-axis acceleration sensor; 43. triaxial fluxgate sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
In the description of the present specification, the terms "comprising," "including," "having," "containing," and the like are used in an open-ended fashion, i.e., to mean including, but not limited to. Reference to the description of the terms "one embodiment," "a particular embodiment," "some embodiments," "for example," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. The sequence of steps involved in the embodiments is for illustrative purposes to illustrate the implementation of the present application, and the sequence of steps is not limited and can be adjusted as needed.
The embodiment of the invention provides an azimuth detection device for an underground fractured casing head, which is particularly suitable for detecting the azimuth of a large-displacement fractured casing head relative to an upper borehole.
Fig. 1 is a schematic diagram of an orientation detection apparatus for a downhole casing head according to an embodiment of the present invention, as shown in fig. 1, the apparatus includes: a probe tube 4, an armored cable 5, a surface interface box 6, computing equipment 7 and a power supply (not shown in fig. 1); the power supply provides power to the computing device 7 and the ground interface box 6.
The detection pipe 4 is connected with a ground interface box 6 through an armored cable 5, is placed in an open hole section 3 of the faulted cased well by the armored cable 5, is used for collecting environmental data at the position of the underground detection pipe, and is transmitted to the ground interface box 6 through the armored cable 5; the ground interface box 6 is connected with the computing device 7 and is used for transmitting the environment data to the computing device 7; the computing device 7 is used for determining the azimuth angle of the fault casing head 2 relative to the upper borehole according to the environment data and the geomagnetic data of the local fault casing well;
it should be noted that a fractured cased hole in the embodiment of the present invention refers to a well with a fractured casing, when a casing string (shown as an icon 1 in fig. 1) is fractured, a drilling tool may be lowered to the fractured casing position, drilling in an upper wellbore direction to drill an open hole section of a predetermined distance (for example, about 10 meters), the drilling tool is removed, a probe 4 is lowered into the open hole section 3 by an armored cable 5, and environmental data at the probe position is collected through the probe 4, where the collected environmental data optionally includes but is not limited to: the well-head angle, the well-head azimuth angle, the three-axis magnetic field intensity of the magnetic field, the three-axis component of the gravity acceleration and the roll angle of the probe at the position of the underground probe.
As an alternative, the probes 4 may collect environmental data around multiple groups (e.g., 10 groups) of probes at intervals of a preset step length (e.g., 0.5 m) in the lower part of the open hole.
After the environmental data around the probe is collected by the probe 4, the azimuth of the fractured casing head relative to the upper borehole may be determined in combination with the local geomagnetic data of the fractured cased hole, optionally including but not limited to: the magnetic induction intensity, the magnetic dip angle and the magnetic declination angle of the geomagnetic field.
As an alternative embodiment, in the downhole casing head position detection apparatus provided in the embodiment of the present invention, the probe 4 may include: the device comprises a stop end plug, an interface end plug, a non-magnetic pressure bearing barrel, a non-magnetic framework, a triaxial gyro sensor, a triaxial acceleration sensor, a triaxial fluxgate sensor, a driving coding circuit board and a data acquisition circuit board.
The three-axis gyro sensor 41, the three-axis acceleration sensor 42, the three-axis fluxgate sensor 43, the driving coding circuit board and the data acquisition circuit board are all fixed on the nonmagnetic framework; the non-magnetic framework, the three-axis gyro sensor 41, the three-axis acceleration sensor 42, the three-axis fluxgate sensor 43, the driving coding circuit board and the data acquisition circuit board are arranged in the non-magnetic pressure bearing cylinder; the first end of the non-magnetic pressure bearing cylinder is connected with the stop end plug, and the second end of the non-magnetic pressure bearing cylinder is connected with the interface end plug. Alternatively, the tri-axis fluxgate sensor 43 may be disposed at an end of the nonmagnetic skeleton near the end-stop plug. Preferably, the X-axis and the Y-axis of the three-axis fluxgate sensor 43, the three-axis gyro sensor 41 and the three-axis acceleration sensor 42 are respectively parallel and equidirectional; and the Z axes of the three-axis fluxgate sensor 43, the three-axis gyro sensor 41 and the three-axis acceleration sensor 42 are collinear and equidirectional, and the Z axis of the three-axis fluxgate sensor 43 is collinear with the central axis of the non-magnetic bearing pressure cylinder, so that the three-axis fluxgate sensor can be used for collecting the three-axis magnetic field intensity of the magnetic field at the position of the probe tube. The arrangement of the three-axis gyro sensor 41, the three-axis acceleration sensor 42 and the three-axis fluxgate sensor 43 inside the probe tube along the axial direction is shown in fig. 2.
As an alternative implementation, the tri-axis fluxgate sensor 43 adopted in the embodiment of the present invention may be a high-precision tri-axis fluxgate sensor. The triaxial magnetic field intensity of the magnetic field at the position of the underground exploring tube can be acquired through the triaxial fluxgate sensor 43; and the data collected by the three-axis gyro sensor 41 and the three-axis acceleration sensor 42 can be used for determining the attitude information of the underground probe.
As an alternative implementation, in the downhole fractured casing head position detecting apparatus provided by the embodiment of the present invention, when the computing device 7 determines the azimuth angle of the fractured casing head relative to the upper wellbore according to the environmental data and the geomagnetic data of the fractured casing well in place, the azimuth angle of the fractured casing head relative to the upper wellbore may be determined according to the following formula:
wherein A isNRIndicating an azimuth of the upper wellbore; FIG. 3 is a schematic representation of a computational model for determining the orientation of a downhole fractured casing head relative to an upper wellbore provided in an embodiment of the present invention, as shown in FIG. 3, BcEAnd BcNAre respectively BchProjections on an E-axis and an N-axis, the E-axis pointing east and the N-axis pointing north;
wherein, Bch＝Bh-Beh；
Wherein, BhDetermining environmental data collected by the probe; b isehDetermined by the geomagnetism data of the faulted cased hole location.
The embodiment of the invention also provides a method for detecting the orientation of the downhole fractured casing head, which can be applied to any optional or preferred downhole fractured casing head orientation detection device. As described in the examples below. Because the principle of solving the problem of the embodiment of the method is similar to that of the underground fault casing head position detection device, the implementation of the embodiment of the method can be referred to the implementation of the embodiment of the device, and repeated parts are not repeated.
Fig. 4 is a flowchart of a method for detecting an orientation of a downhole casing head according to an embodiment of the present invention, where as shown in fig. 4, the method includes:
s401, controlling a drilling tool to be lowered to the position of the fault position of the inner sleeve of the fault cased hole, and drilling an open hole section with a preset distance along the direction of an upper well hole;
s402, the drilling tool is controlled to be taken out, the armored cable is controlled to place the probe into the open hole section, and the environmental data of the position of the underground probe are collected by the probe, wherein the environmental data comprise: the well inclination angle and the well inclination azimuth angle at the position of the underground exploring tube, the triaxial magnetic field intensity of a magnetic field, the triaxial component of the gravity acceleration and the roll angle of the exploring tube;
s403, receiving environmental data acquired by the probe through the armored cable;
s404, determining the azimuth angle of the faulted casing head relative to the upper borehole according to the environment data and the local geomagnetic data of the faulted casing well, wherein the geomagnetic data comprises: the magnetic induction intensity, the magnetic dip angle and the magnetic declination angle of the geomagnetic field.
It should be noted that the predetermined distance in S401 may be set according to specific situations, and as an optional implementation manner, in the embodiment of the present invention, the drilling tool is lowered to the casing pipe fracture position, and drilling is performed along the upper wellbore direction, so as to drill an open hole section of about 10 meters; in the above S402, the probes may collect environmental data around multiple groups (e.g., 10 groups) of probes at intervals of a preset step length (e.g., 0.5 meter) in the lower part of the open hole, and optionally, the environmental data collected by the probes includes but is not limited to: the well inclination angle, the well inclination azimuth angle, the roll angle of the probe tube, the triaxial magnetic field intensity of a magnetic field at the position of the probe tube, the triaxial component of the gravity acceleration and the like; the geomagnetic data of the fractured cased hole local area used in S404 may be data of magnetic induction intensity, magnetic dip angle, magnetic declination angle, and the like of a geomagnetic field acquired in advance.
As an alternative embodiment, the azimuth angle of the faulted casing head with respect to the upper wellbore may be determined by the following formula S404:
wherein A isNRIndicating an azimuth of the upper wellbore; b iscEAnd BcNAre respectively BchProjections on an E-axis and an N-axis, the E-axis pointing east and the N-axis pointing north;
wherein, Bch＝Bh-Beh；
Wherein, BhDetermining environmental data collected by the probe; b isehDetermined by the geomagnetism data of the faulted cased hole location.
It should be noted that, in the method for detecting the orientation of the downhole casing head, the probe at least includes: the sensor comprises a triaxial gyro sensor, a triaxial acceleration sensor and a triaxial fluxgate sensor; the three-axis fluxgate sensor is used for acquiring the three-axis magnetic field intensity of a magnetic field at the position of the underground probe; and the data acquired by the three-axis gyro sensor and the three-axis acceleration sensor are used for determining the attitude information of the underground probe.
Optionally, the probe tube adopted in the embodiment of the present invention may further include: the device comprises a stop end plug, an interface end plug, a non-magnetic pressure bearing barrel, a non-magnetic framework, a driving coding circuit board and a data acquisition circuit board; the three-axis gyro sensor, the three-axis acceleration sensor, the three-axis fluxgate sensor, the driving coding circuit board and the data acquisition circuit board are all fixed on the nonmagnetic framework; the non-magnetic framework, the three-axis gyro sensor, the three-axis acceleration sensor, the three-axis fluxgate sensor, the driving coding circuit board and the data acquisition circuit board are arranged in the non-magnetic bearing pressure barrel; the first end of the non-magnetic pressure bearing cylinder is connected with the stop end plug, and the second end of the non-magnetic pressure bearing cylinder is connected with the interface end plug; the three-axis fluxgate sensor is arranged at one end, close to the end stop plug, of the non-magnetic framework; the X axis and the Y axis of the three-axis fluxgate sensor, the three-axis gyro sensor and the three-axis acceleration sensor are respectively parallel and equidirectional; the Z axes of the three-axis fluxgate sensor, the three-axis gyro sensor and the three-axis acceleration sensor are collinear and equidirectional with the central axis of the non-magnetic bearing pressure cylinder.
The embodiment of the invention also provides computer equipment for solving the technical problem that the existing fault casing head orientation prediction method is low in precision in the fault casing repair project, the computer equipment comprises a memory, a processor and a computer program which is stored on the memory and can be operated on the processor, and when the processor executes the computer program, any optional or preferred underground fault casing head orientation detection method in the embodiment of the method is realized.
The embodiment of the invention also provides a computer readable storage medium, which is used for solving the technical problem that the existing fault casing head position prediction method is low in precision in the fault casing repair project, and the computer readable storage medium stores a computer program for executing any optional or preferred underground fault casing head position detection method in the method embodiments.
In summary, the embodiment of the present invention provides a method for detecting an orientation of a downhole casing head, which may be applied to, but not limited to, a large-displacement casing repair project. The method comprises the steps of collecting a well inclination angle, a well inclination azimuth angle, triaxial magnetic field intensity of a magnetic field and triaxial components of gravity acceleration at the position of a probe by using the probe of the underground open hole well section, and a roll angle of the probe, determining an azimuth angle of a faulted casing head relative to an upper well bore by combining geomagnetic data such as magnetic induction intensity, magnetic inclination angle and magnetic declination of a local geomagnetic field, and providing scientific basis for searching the faulted casing head.
The azimuth angle of the faulted casing head relative to the upper borehole can be accurately determined by the method for detecting the azimuth of the underground faulted casing head provided by the embodiment of the invention, the problem of large prediction error of the azimuth angle of the faulted casing head relative to the upper borehole in the existing faulted casing repairing technology is solved, and the method is favorable for improving the repairing success rate of the faulted casing.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A downhole fractured casing head orientation detection device, comprising: the system comprises a probe, an armored cable, a ground interface box, computing equipment and a power supply; the power supply supplies power to the computing device and the ground interface box;
the detection pipe is connected with the ground interface box through the armored cable, is placed in an open hole section of the fractured cased well by the armored cable, is used for collecting environmental data at the position of the underground detection pipe, and is transmitted to the ground interface box through the armored cable; the ground interface box is connected with the computing equipment and is used for transmitting the environment data to the computing equipment; the computing equipment is used for determining the azimuth angle of the fault casing head relative to the upper borehole according to the environment data and the geomagnetic data of the local fault casing well;
the open hole section is an open hole section which is controlled by a drilling tool to be lowered to the position of the dislocation of the inner sleeve of the dislocation cased well and drilled out at a preset distance along the direction of the upper well hole; the environmental data includes: the well inclination angle and the well inclination azimuth angle at the position of the underground exploring tube, the triaxial magnetic field intensity of a magnetic field, the triaxial component of the gravity acceleration and the roll angle of the exploring tube; the geomagnetic data includes: the magnetic induction intensity, the magnetic inclination angle and the magnetic declination angle of the geomagnetic field;
wherein the computing device is further configured to determine an azimuth angle of the faulted casing head relative to the upper wellbore by:
wherein A isNRIndicating an azimuth of the upper wellbore; b iscEAnd BcNAre respectively BchProjections on an E-axis and an N-axis, the E-axis pointing east and the N-axis pointing north;
wherein, Bch＝Bh-Beh；
Wherein, BhDetermining environmental data collected by the probe; b isehDetermined by the geomagnetism data of the faulted cased hole location.
2. The apparatus of claim 1, wherein the probe comprises: the sensor comprises a triaxial gyro sensor, a triaxial acceleration sensor and a triaxial fluxgate sensor;
the triaxial fluxgate sensor is used for acquiring triaxial magnetic field intensity of a magnetic field at the position of the underground probe; and the data acquired by the three-axis gyro sensor and the three-axis acceleration sensor are used for determining the attitude information of the underground probe.
3. The apparatus of claim 2, wherein the probe further comprises: the device comprises a stop end plug, an interface end plug, a non-magnetic pressure bearing barrel, a non-magnetic framework, a driving coding circuit board and a data acquisition circuit board;
the three-axis gyro sensor, the three-axis acceleration sensor, the three-axis fluxgate sensor, the driving coding circuit board and the data acquisition circuit board are all fixed on the nonmagnetic framework; the nonmagnetic framework, the triaxial gyro sensor, the triaxial acceleration sensor, the triaxial fluxgate sensor, the driving coding circuit board and the data acquisition circuit board are arranged in the nonmagnetic bearing pressure barrel; the first end of the non-magnetic pressure bearing cylinder is connected with the stop end plug, and the second end of the non-magnetic pressure bearing cylinder is connected with the interface end plug; the three-axis fluxgate sensor is arranged at one end, close to the end-stop plug, of the non-magnetic framework; the X axis and the Y axis of the three-axis fluxgate sensor, the three-axis gyro sensor and the three-axis acceleration sensor are respectively parallel and equidirectional; the Z axes of the three-axis fluxgate sensor, the three-axis gyro sensor and the three-axis acceleration sensor are collinear and in the same direction with the central axis of the nonmagnetic pressure bearing cylinder.
4. A method for detecting the orientation of a downhole fractured casing head, comprising:
controlling the drilling tool to be lowered to the position of the dislocation position of the inner sleeve of the dislocation cased well, and drilling an open hole section with a preset distance along the direction of the upper well hole;
controlling the drilling tool to take out, controlling an armored cable to lower a probe to the open hole section, and acquiring environmental data of the position of the underground probe by the probe, wherein the environmental data comprises: the well inclination angle and the well inclination azimuth angle at the position of the underground exploring tube, the triaxial magnetic field intensity of a magnetic field, the triaxial component of the gravity acceleration and the roll angle of the exploring tube;
receiving environmental data collected by the probe through the armored cable;
determining an azimuth angle of a faulted casing head relative to an upper wellbore from the environmental data and local geomagnetic data for the faulted casing well, wherein the geomagnetic data comprises: the magnetic induction intensity, the magnetic inclination angle and the magnetic declination angle of the geomagnetic field;
wherein determining an azimuth angle of the faulted casing head relative to the upper wellbore from the environmental data and local geomagnetic data for the faulted casing well comprises: the azimuth of the faulted casing head relative to the upper wellbore is determined by the following equation:
wherein A isNRIndicating an azimuth of the upper wellbore; b iscEAnd BcNAre respectively BchProjections on an E-axis and an N-axis, the E-axis pointing east and the N-axis pointing north;
wherein, Bch＝Bh-Beh；
Wherein, BhDetermining environmental data collected by the probe; b isehDetermined by the geomagnetism data of the faulted cased hole location.
5. The method of claim 4, wherein the probe comprises: the sensor comprises a triaxial gyro sensor, a triaxial acceleration sensor and a triaxial fluxgate sensor;
the triaxial fluxgate sensor is used for acquiring triaxial magnetic field intensity of a magnetic field at the position of the underground probe; and the data acquired by the three-axis gyro sensor and the three-axis acceleration sensor are used for determining the attitude information of the underground probe.
6. The method of claim 5, wherein the probe further comprises: the device comprises a stop end plug, an interface end plug, a non-magnetic pressure bearing barrel, a non-magnetic framework, a driving coding circuit board and a data acquisition circuit board;
the three-axis gyro sensor, the three-axis acceleration sensor, the three-axis fluxgate sensor, the driving coding circuit board and the data acquisition circuit board are all fixed on the nonmagnetic framework; the nonmagnetic framework, the triaxial gyro sensor, the triaxial acceleration sensor, the triaxial fluxgate sensor, the driving coding circuit board and the data acquisition circuit board are arranged in the nonmagnetic bearing pressure barrel; the first end of the non-magnetic pressure bearing cylinder is connected with the stop end plug, and the second end of the non-magnetic pressure bearing cylinder is connected with the interface end plug; the three-axis fluxgate sensor is arranged at one end, close to the end-stop plug, of the non-magnetic framework; the X axis and the Y axis of the three-axis fluxgate sensor, the three-axis gyro sensor and the three-axis acceleration sensor are respectively parallel and equidirectional; the Z axes of the three-axis fluxgate sensor, the three-axis gyro sensor and the three-axis acceleration sensor are collinear and in the same direction with the central axis of the nonmagnetic pressure bearing cylinder.
7. A computer apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program implements the method of downhole erroneous casing head orientation detection according to any of claims 4 to 6.
8. A computer readable storage medium having stored thereon a computer program for executing the method of detecting a downhole erroneous casing head orientation according to any of claims 4 to 6.
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| US8553494B2 (en) * | 2007-01-11 | 2013-10-08 | Baker Hughes Incorporated | System for measuring stress in downhole tubulars |
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