Casing Outer Armored Optical Fiber Continuous Positioning Logging Device and Usage Method

Abstract

The present invention relates to the technical field of oil industry exploration and development, and is a casing outer armored optical fiber continuous positioning logging device and a usage method thereof. The device includes a housing with closed upper and lower ends, and a control unit, a triaxial magnetic sensor array, an orthogonal excitation coil, and a triaxial accelerometer are arranged inside the housing; the orthogonal excitation coil is energized to generate an excitation current, and the excitation current generates a magnetic field; the triaxial magnetic sensor array measures the distribution state of the magnetic field lines in the magnetic field; the triaxial accelerometer measures the gravitational acceleration of the up-and-down movement of the housing. By setting the control unit to control the orthogonal excitation coil to be energized to generate a magnetic field, the triaxial magnetic sensor array measures the distribution state of the magnetic field lines and outputs it to the control unit, and the triaxial accelerometer measures the gravitational acceleration of the up-and-down movement of the housing and outputs it to the control unit, the control unit calculates the orientation of the optical fiber relative to the casing, accurately locates the orientation of the optical fiber, and provides accurate optical fiber orientation data for the directional perforation operation without damaging the optical fiber.

Description

Technical Field

[0001] The present invention relates to the technical field of oil industry exploration and development, and is a continuous positioning logging device for armored optical fiber outside the casing and a using method thereof. Background Art

[0002] The downhole permanent optical fiber sensor is one of the current hot technologies for dynamic monitoring. The existing optical fiber positioning logging tool outside the casing completes the positioning of the optical fiber by installing an optical fiber protection card at the casing collar and measuring the azimuth of the optical fiber protection card. However, in this logging method, when the azimuth angle of the optical fiber changes rapidly with the logging depth, the azimuth of the optical fiber protection card cannot accurately reflect the azimuth of the optical fiber, which causes difficulties in directional perforation and thus cannot ensure that the optical fiber is not damaged during the directional perforation operation. Summary of the Invention

[0003] The present invention provides a continuous positioning logging device for armored optical fiber outside the casing and a using method thereof, which overcomes the above-mentioned deficiencies of the prior art and can effectively solve the problem that when the azimuth angle of the optical fiber changes rapidly with the logging depth, the azimuth of the optical fiber protection card cannot accurately reflect the azimuth of the optical fiber in the existing optical fiber positioning using the optical fiber protection card.

[0004] One technical solution of the present invention is achieved by the following measures: A continuous positioning logging device for armored optical fiber outside the casing includes a housing closed at both upper and lower ends, and a control unit, a triaxial magnetic sensor array, an orthogonal excitation coil, and a triaxial accelerometer are arranged inside the housing;

[0005] The orthogonal excitation coil is energized to generate an exciting current, and the exciting current generates a magnetic field;

[0006] The triaxial magnetic sensor array measures the distribution state of the magnetic field lines in the magnetic field;

[0007] The triaxial accelerometer measures the gravitational acceleration of the up and down movement of the housing;

[0008] The control unit controls the orthogonal excitation coil to be energized, and at the same time collects the distribution state of the magnetic field lines measured by the triaxial magnetic sensor array and the gravitational acceleration data measured by the triaxial accelerometer, and calculates to obtain the azimuth angle of the optical fiber.

[0009] The following is a further optimization and / or improvement of the above-mentioned technical solution of the invention:

[0010] The above-mentioned control unit may include a main control module, a power supply module, and a communication module. The power supply module and the communication module are both connected to the main control module, and the triaxial magnetic sensor array, the orthogonal excitation coil, and the triaxial accelerometer are all connected to the main control module.

[0011] The above-mentioned triaxial magnetic sensor array may include a plurality of triaxial magnetic sensors, and the plurality of triaxial magnetic sensors are coaxial with the housing and are arranged in a circumferential array.

[0012] The above may further include an installation skeleton, which includes a support block, an upper fixed straight cylinder, a lower fixed straight cylinder, and a fixed block. At least two fixed blocks are arranged radially along the outer side of the support block, and one side of each fixed block away from the support block is fixedly connected to the inner side of the housing. The upper and lower ends of the support block are respectively fixed with an upper fixed straight cylinder and a lower fixed straight cylinder. The upper end of the upper fixed straight cylinder is connected to the triaxial excitation sensor array, and the lower end of the lower fixed straight cylinder is connected to the triaxial accelerometer. The orthogonal excitation coil is sleeved on the outer side of the upper fixed straight cylinder.

[0013] The above housing may be in a hollow cylindrical shape, with an upper end cover fixedly sealed at the upper end of the housing and a lower end cover fixedly sealed at the lower end of the housing.

[0014] An outer ring groove may be provided on the outer side of the upper part of the above housing.

[0015] The second technical solution of the present invention is achieved by the following measures: A method for using an outer armored optical fiber continuous positioning logging device for casing, including the following steps:

[0016] Lower the casing and the optical fiber synchronously and slowly into the wellbore of the formation and fix them with cement slurry;

[0017] Place the whole housing inside the casing;

[0018] The control unit is connected to an external host computer;

[0019] The control unit controls the orthogonal excitation coil to be energized to generate an excitation current, and the excitation current generates a magnetic field;

[0020] The triaxial magnetic sensor array measures the distribution state of the magnetic field lines;

[0021] The triaxial accelerometer measures the gravitational acceleration of the housing moving up and down;

[0022] In the magnetic field intensity received by the control unit, obtain the maximum magnetic field intensity, and obtain the angle R between the maximum magnetic field intensity and the horizontal direction of the triaxial magnetic sensor array A , which is the azimuth angle of the triaxial magnetic sensor array;

[0023] The control unit obtains the gravitational acceleration of the housing moving up and down, and calculates the azimuth angle R of the triaxial magnetic sensor array relative to the casing according to the following formula B :

[0024]

[0025] In the above formula, taking the axial direction of the casing as the Z axis and the plane orthogonal to the Z axis as the XoY plane, define a certain direction of the casing on the XoY plane as the X axis, and the direction orthogonal to the X axis as the Y axis. The components A of the gravitational acceleration on the three axes can be measured by the triaxial accelerometer X 、A Y, A Z ;

[0026] Add the angle R between the maximum magnetic field intensity and the horizontal direction of the triaxial magnetic sensor array A and the azimuth angle R of the triaxial magnetic sensor array relative to the casing B to obtain the azimuth angle R of the optical fiber relative to the casing, that is:

[0027] R = R A + R B .

[0028] In the present invention, by setting a control unit to control the energization of the orthogonal excitation coil to generate a magnetic field, the triaxial magnetic sensor array measures the distribution state of the magnetic field lines and outputs it to the control unit, and the triaxial accelerometer measures the gravitational acceleration of the up and down movement of the housing and outputs it to the control unit. The control unit calculates the azimuth of the optical fiber relative to the casing, accurately locates the azimuth of the optical fiber, and solves the problem that when the azimuth angle of the optical fiber changes rapidly with the logging depth in the existing method of using an optical fiber protection card for optical fiber positioning, the azimuth of the optical fiber protection card cannot accurately reflect the azimuth of the optical fiber, providing accurate optical fiber azimuth data for the directional perforation operation without damaging the optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Attached Figure 1 is a schematic front sectional view of an embodiment of the present invention.

[0030] Attached Figure 2 is a schematic top view of an embodiment of the present invention.

[0031] Attached Figure 3 is a schematic circuit diagram of an embodiment of the present invention.

[0032] Attached Figure 4 is an installation schematic diagram when the present invention is in use.

[0033] The codes in the drawings are respectively: 1 is the housing, 2 is the control unit, 3 is the triaxial magnetic sensor array, 4 is the orthogonal excitation coil, 5 is the triaxial accelerometer, 6 is the support block, 7 is the upper fixed straight cylinder, 8 is the lower fixed straight cylinder, 9 is the fixing block, 10 is the upper end cover, 11 is the lower end cover, 12 is the outer ring groove, 13 is the casing, 14 is the optical fiber, 15 is the formation, and 16 is the wellbore. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The present invention is not limited by the following embodiments, and the specific implementation manners can be determined according to the technical solutions of the present invention and the actual situation.

[0035] In the present invention, for the convenience of description, the description of the relative position relationship of each component is based on the attached drawings of the specification Figure 1It is described in the layout mode, such as the positional relationships of front, back, up, down, left, right, etc. are determined according to the layout direction of the attached drawings of the specification. Figure 1 It is determined according to the layout direction.

[0036] The present invention will be further described below in conjunction with embodiments and the accompanying drawings:

[0037] As shown in the attached drawings Figure 1 , 2 As shown, an outer-sheath armored optical fiber continuous positioning logging device of the present invention includes a housing 1 with closed upper and lower ends. A control unit 2, a triaxial magnetic sensor array 3, an orthogonal excitation coil 4, and a triaxial accelerometer 5 are arranged inside the housing 1;

[0038] When the orthogonal excitation coil 4 is powered on, an exciting current is generated, and the exciting current generates a magnetic field;

[0039] The triaxial magnetic sensor array 3 measures the distribution state of the magnetic force lines in the magnetic field;

[0040] The triaxial accelerometer 5 measures the gravitational acceleration of the up-and-down movement of the housing 1;

[0041] The control unit 2 controls the orthogonal excitation coil 4 to be powered on, and at the same time collects the distribution state of the magnetic force lines measured by the triaxial magnetic sensor array 3 and the gravitational acceleration data measured by the triaxial accelerometer 5, and calculates to obtain the azimuth angle of the optical fiber 14.

[0042] The above-mentioned housing 1 can be a high-temperature and high-pressure resistant housing 1 made of non-magnetic metal or composite material.

[0043] During use, as shown in the attached drawings Figure 4As shown in the figure, the casing 13 and the optical fiber 14 are slowly and synchronously lowered into the wellbore 16 of the formation 15 and fixed by cement slurry. The housing 1 is integrally placed inside the casing 13. The control unit 2 is connected to an external host computer. The control unit 2 controls the orthogonal excitation coil 4 to be energized to generate an excitation current. The excitation current generates a magnetic field. Due to the presence of the casing 13 and the optical fiber 14, the magnetic lines of force generated by this magnetic field are non-uniformly distributed. The magnetic lines of force are densely distributed on one side close to the optical fiber 14 and sparsely distributed on the other side. Thus, the distribution state of the magnetic lines of force is measured by the triaxial magnetic sensor array 3. The control unit 2 obtains the distribution state of the magnetic lines of force, gets the magnitude of the corresponding magnetic field intensity, obtains the azimuth of the triaxial magnetic sensor array 3 according to the magnitude of the magnetic field intensity, determines the relationship between the azimuth of the triaxial magnetic sensor array 3 and the azimuth of the optical fiber 14, and gets the azimuth angle of the optical fiber 14 relative to the triaxial magnetic sensor array 3 in the horizontal direction. The control unit 2 obtains the gravitational acceleration of the up and down movement of the housing 1, calculates the azimuth angle of the triaxial magnetic sensor array 3 relative to the casing 13, and then by adding the azimuth angle of the optical fiber 14 relative to the triaxial magnetic sensor array 3 in the horizontal direction to the azimuth angle of the triaxial magnetic sensor array 3 relative to the casing 13, obtains the azimuth angle of the optical fiber 14 relative to the casing 13, and outputs the azimuth angle of the optical fiber 14 relative to the casing 13 to the host computer.

[0044] As needed, the armored optical fiber 14 can be selected for the optical fiber 14. By using armored optical fibers 14 with different materials and different structures, the high temperature resistance, high pressure resistance, tensile resistance, extrusion resistance and impact resistance of the optical fiber 14 are enhanced, ensuring the integrity and smoothness of the optical fiber 14 during downhole operations and facilitating adaptation to the harsh downhole environment of high temperature and high pressure.

[0045] In summary, in the present invention, by setting the control unit 2 to control the orthogonal excitation coil 4 to be energized to generate a magnetic field, the triaxial magnetic sensor array 3 measures the distribution state of the magnetic lines of force and outputs it to the control unit 2, and the triaxial accelerometer 5 measures the gravitational acceleration of the up and down movement of the housing 1 and outputs it to the control unit 2. The control unit 2 calculates to obtain the azimuth of the optical fiber 14 relative to the casing 13, accurately locates the azimuth of the optical fiber 14, and solves the problem that in the existing method of using an optical fiber protection card to locate the optical fiber 14, when the azimuth angle of the optical fiber 14 changes rapidly with the logging depth, the azimuth of the optical fiber protection card cannot accurately reflect the azimuth of the optical fiber 14, providing accurate optical fiber 14 azimuth data for the directional perforation operation without damaging the optical fiber 14.

[0046] According to actual needs, the above-mentioned continuous positioning logging device for armored optical fiber outside the casing can be further optimized and / or improved:

[0047] As shown in the appendix Figure 3 As shown in the figure, the control unit 2 includes a main control module, a power module and a communication module. The power module and the communication module are both connected to the main control module. The triaxial magnetic sensor array 3, the orthogonal excitation coil 4 and the triaxial accelerometer 5 are all connected to the main control module.

[0048] The above power supply module is used to supply power to the main control module; the communication module can select wireless communication methods such as ZigBee, Bluetooth, and WiFi for communication between the main control module and an external host computer; the main functions of the main control module are: 1. Communicate with the external host computer through the communication module; 2. Collect the distribution state of the magnetic field lines measured by the three-axis magnetic sensor array 3 and calculate the orientation of the optical fiber 14 relative to the three-axis magnetic sensor array 3; 3. Collect the gravitational acceleration data measured by the three-axis accelerometer 5, calculate the orientation of the three-axis magnetic sensor array 3 relative to the casing 13, and further calculate the orientation of the optical fiber 14 relative to the casing 13.

[0049] As shown in the attached Figure 1 、 2 figure, the three-axis magnetic sensor array 3 includes a plurality of three-axis magnetic sensors, and the plurality of three-axis magnetic sensors are coaxial with the housing 1 and arranged in a circumferential array. By arranging the plurality of three-axis magnetic sensors in a circumferential array, the distribution state of the magnetic field lines in different orientations can be measured, which is convenient for accurate positioning.

[0050] As shown in the attached Figure 1 、 2 figure, it further includes an installation skeleton, which includes a support block 6, an upper fixed straight cylinder 7, a lower fixed straight cylinder 8, and a fixing block 9. At least two fixing blocks 9 are arranged radially on the outer side of the support block 6, and one side of each fixing block 9 away from the support block 6 is fixedly connected to the inner side of the housing 1. The upper and lower ends of the support block 6 are respectively fixed with an upper fixed straight cylinder 7 and a lower fixed straight cylinder 8. The upper end of the upper fixed straight cylinder 7 is connected to the three-axis magnetic sensor array 3, the lower end of the lower fixed straight cylinder 8 is connected to the three-axis accelerometer 5, and the orthogonal excitation coil 4 is sleeved on the outer side of the upper fixed straight cylinder 7.

[0051] By setting it like this, it is convenient to fix the orthogonal excitation coil 4, the three-axis magnetic sensor array 3, and the three-axis accelerometer 5 on the inner side of the housing 1.

[0052] As shown in the attached Figure 1 、 2 figure, the housing 1 is in the shape of a hollow cylinder, and an upper end cover 10 is fixedly sealed at the upper end of the housing 1, and a lower end cover 11 is fixedly sealed at the lower end of the housing 1.

[0053] By setting it like this, it can prevent foreign objects from entering the inner side of the housing 1 and enhance the pressure resistance performance of the housing 1.

[0054] As shown in the attached Figure 1 、 2 figure, an outer ring groove 12 is provided on the outer side of the upper part of the housing 1.

[0055] During use, if the medium between the sleeve 13 and the housing 1 is not liquid, a sealing ring needs to be provided in the outer ring groove 12 to seal between the housing 1 and the outer ring groove 12; if the medium between the sleeve 13 and the housing 1 is liquid, no sealing ring needs to be installed.

[0056] Embodiment 2: The embodiment of the present invention discloses a method for using a continuously positioned logging device for an armored optical fiber outside a casing, including the following steps:

[0057] S101, slowly lower the sleeve 13 and the optical fiber 14 synchronously into the wellbore 16 of the formation 15 and fix them with cement slurry;

[0058] S102, place the entire housing 1 inside the sleeve 13;

[0059] S103, connect the control unit 2 to an external host computer;

[0060] S104, the control unit 2 controls the orthogonal excitation coil 4 to be energized to generate an excitation current, and the excitation current generates a magnetic field;

[0061] S105, the three-axis magnetic sensor array 3 measures the distribution state of the magnetic field lines;

[0062] S106, the three-axis accelerometer 5 measures the gravitational acceleration of the up and down movement of the housing 1;

[0063] S107, in the received magnetic field intensities, the control unit 2 obtains the maximum magnetic field intensity and obtains the angle R between the maximum magnetic field intensity and the horizontal direction of the three-axis magnetic sensor array 3 A , which is the azimuth angle of the three-axis magnetic sensor array 3;

[0064] S108, the control unit 2 obtains the gravitational acceleration of the up and down movement of the housing 1 and calculates the azimuth angle R of the three-axis magnetic sensor array 3 relative to the sleeve 13 according to the following formula B :

[0065]

[0066] In the above formula, the axial direction of the sleeve 13 is used as the Z axis, the plane orthogonal to the Z axis is used as the XoY plane, a certain direction (tool face reference axis) of the sleeve 13 is defined as the X axis on the XoY plane, and the direction orthogonal to the X axis is the Y axis. The three-axis accelerometer 5 can measure the components A X 、A Y 、A Z ;

[0067] S109, the angle R between the maximum magnetic field intensity and the horizontal direction of the three-axis magnetic sensor array 3 A and the azimuth angle R of the three-axis magnetic sensor array 3 relative to the sleeve 13 BAdding them gives the azimuth angle R of the optical fiber 14 relative to the sleeve 13, that is:

[0068] R = R A + R B .

[0069] The above control unit 2 obtains the included angle R between the maximum magnetic field intensity and the horizontal direction of the triaxial magnetic sensor array 3 A , which is the azimuth angle of the triaxial magnetic sensor array 3. Specifically, taking the horizontal direction of any azimuth triaxial magnetic sensor array 3 as the X-axis, the control unit 2 measures the included angle R between the maximum magnetic field intensity and the triaxial magnetic sensor array 3 A , that is, the included angle between the maximum magnetic field intensity and the X-axis is also R A . Also, because the azimuth of the maximum magnetic field intensity is the azimuth of the optical fiber 14, it is further obtained that the included angle between the optical fiber 14 and the X-axis is also R A .

[0070] The above technical features constitute an embodiment of the present invention, which has strong adaptability and implementation effects. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. Method for using an outer casing armored optical fiber continuous positioning logging device, characterized in that the outer casing armored optical fiber continuous positioning logging device comprises a housing with closed upper and lower ends, and a control unit, a triaxial magnetic sensor array, an orthogonal excitation coil and a triaxial accelerometer are arranged inside the housing; the orthogonal excitation coil is energized to generate an exciting current, and the exciting current generates a magnetic field; the triaxial magnetic sensor array measures the distribution state of the magnetic force lines in the magnetic field; the triaxial accelerometer measures the gravitational acceleration of the up and down movement of the housing; the control unit controls the orthogonal excitation coil to be energized, and simultaneously collects the distribution state of the magnetic force lines measured by the triaxial magnetic sensor array, and collects the gravitational acceleration data measured by the triaxial accelerometer, and calculates to obtain the azimuth angle of the optical fiber; the method for using the outer casing armored optical fiber continuous positioning logging device comprises the following steps: slowly lower the casing and the optical fiber synchronously into the wellbore of the formation and fix them with cement slurry; put the whole housing inside the casing; connect the control unit to an external host computer; the control unit controls the orthogonal excitation coil to be energized to generate an exciting current, and the exciting current generates a magnetic field; the triaxial magnetic sensor array measures the distribution state of the magnetic force lines; the triaxial accelerometer measures the gravitational acceleration of the up and down movement of the housing; The control unit obtains the maximum magnetic field strength from the received magnetic field strengths, and obtains the angle R between the maximum magnetic field strength and the horizontal direction of the triaxial magnetic sensor array A , which is the azimuth angle of the triaxial magnetic sensor array; The control unit obtains the gravitational acceleration of the up-and-down movement of the housing, and calculates the azimuth angle R of the triaxial magnetic sensor array relative to the casing according to the following formula B : In the above formula, the axial direction of the casing is taken as the Z-axis, the plane orthogonal to the Z-axis is taken as the XoY plane. On the XoY plane, a certain direction of the casing is defined as the X-axis, and the direction orthogonal to the X-axis is the Y-axis. The components of the gravitational acceleration on the three axes, A X , A Y , A Z ; The included angle R between the maximum magnetic field intensity and the horizontal direction of the triaxial magnetic sensor array A and the azimuth angle R of the triaxial magnetic sensor array relative to the casing B are added together to obtain the azimuth angle R of the optical fiber relative to the casing, that is: 。 2. The method for using the outer casing armored optical fiber continuous positioning logging device according to claim 1, characterized in that the control unit comprises a main control module, a power module and a communication module, the power module and the communication module are both connected to the main control module, and the triaxial magnetic sensor array, the orthogonal excitation coil and the triaxial accelerometer are all connected to the main control module.

3. The method for using the outer casing armored optical fiber continuous positioning logging device according to claim 1 or 2, characterized in that the triaxial magnetic sensor array comprises a plurality of triaxial magnetic sensors, and the plurality of triaxial magnetic sensors are coaxial with the housing and arranged in a circumferential array.

4. The method for using the outer casing armored optical fiber continuous positioning logging device according to claim 1 or 2, characterized in that it further comprises an installation skeleton, the installation skeleton comprises a support block, an upper fixed straight cylinder, a lower fixed straight cylinder and a fixing block, at least two fixing blocks are arranged radially on the outer side of the support block, and one side of each fixing block away from the support block is fixedly connected to the inner side of the housing, the upper and lower ends of the support block are respectively fixed with an upper fixed straight cylinder and a lower fixed straight cylinder, the upper end of the upper fixed straight cylinder is connected to the triaxial excitation sensor array, the lower end of the lower fixed straight cylinder is connected to the triaxial accelerometer, and the orthogonal excitation coil is sleeved on the outer side of the upper fixed straight cylinder.

5. The method for using the outer casing armored optical fiber continuous positioning logging device according to claim 3, characterized in that it further comprises an installation skeleton, the installation skeleton comprises a support block, an upper fixed straight cylinder, a lower fixed straight cylinder and a fixing block, at least two fixing blocks are arranged radially on the outer side of the support block, and one side of each fixing block away from the support block is fixedly connected to the inner side of the housing, the upper and lower ends of the support block are respectively fixed with an upper fixed straight cylinder and a lower fixed straight cylinder, the upper end of the upper fixed straight cylinder is connected to the triaxial excitation sensor array, the lower end of the lower fixed straight cylinder is connected to the triaxial accelerometer, and the orthogonal excitation coil is sleeved on the outer side of the upper fixed straight cylinder.

6. The method for using the outer casing armored optical fiber continuous positioning logging device according to claim 1 or 2 or 5, It is characterized in that The housing is in a hollow cylindrical shape, with an upper end cover sealed and fixed at the upper end of the housing, and a lower end cover sealed and fixed at the lower end of the housing; and / or, an outer ring groove is provided on the outer side of the upper part of the housing.

7. The method for using the casing outer armored optical fiber continuous positioning logging device according to claim 3, It is characterized in that The housing is in a hollow cylindrical shape, with an upper end cover sealed and fixed at the upper end of the housing, and a lower end cover sealed and fixed at the lower end of the housing; and / or, an outer ring groove is provided on the outer side of the upper part of the housing.

8. The method for using the casing outer armored optical fiber continuous positioning logging device according to claim 4, It is characterized in that The housing is in a hollow cylindrical shape, with an upper end cover sealed and fixed at the upper end of the housing, and a lower end cover sealed and fixed at the lower end of the housing; and / or, an outer ring groove is provided on the outer side of the upper part of the housing.

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