CN113107472B - Active magnetic distance measuring device and method suitable for well drilling collision prevention - Google Patents
Active magnetic distance measuring device and method suitable for well drilling collision prevention Download PDFInfo
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Abstract
The invention relates to the technical field of well drilling, and provides an active magnetic distance measuring device and method suitable for well drilling collision prevention, wherein the active magnetic distance measuring device comprises a magnetic field intensity signal marking device, the magnetic field intensity signal marking device is used for being arranged on a sleeve pipe of a collision prevention well section of an adjacent well, a magnetic part is arranged on the magnetic field intensity signal marking device, and the magnetic part is used for generating an additional magnetic field; the device comprises a while-drilling magnetic induction detection device, a magnetic induction detection device and a magnetic induction detection device, wherein the while-drilling magnetic induction detection device is used for being installed at the upper part of a drill bit for drilling and is dozens of meters away from the drill bit; and the analysis and calculation device is connected with the while-drilling magnetic induction detection device. Through the technical scheme, the problem of safe drilling collision prevention in the related technology is solved.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to an active magnetic distance measuring device and method suitable for drilling anti-collision.
Background
In the cluster well group drilling, a positive drilling track passes through a completed well casing pipe network, although a collision prevention and operation method is fully considered in the design of a profile track of the positive drilling, the accident still cannot be solved due to a passive magnetic distance measurement method and errors of various measurement data, and no better method exists abroad because all collision prevention measures are established on a mathematical model for scanning collision prevention data by adopting a nearest distance method.
The method is characterized in that input measured data is calculated by a software formula to give an anti-collision prompt, but in actual construction, a passive magnetic distance measurement method is adopted to give an anti-collision prompt, MWD magnetic measurement instruments commonly used at home and abroad monitor the magnetic field of a casing of an adjacent well, however, the magnetic field intensity of the casing string is weaker than the magnetic field of the earth, the radius of the casing magnetic field which can be detected by a probe of the conventional MWD instrument is small, the change of the casing magnetic field in the passive measurement well belongs to the change of the casing magnetic field in the passive measurement well, the radius of the casing magnetic field which can be determined by passive distance measurement is only 2 meters, when abnormal parameters of the magnetic field are found, the casing magnetic field is very close to or collides with the anti-collision casing, the collision accident of drilling is that a drill bit crushes the casing, and a stabilizer in a lower guide drilling tool combination is used for stabilizing the direction during rotary drilling.
Disclosure of Invention
The invention provides an active magnetic distance measuring device and method suitable for well drilling collision prevention, and solves the problem of well drilling safety collision prevention in the related technology.
The technical scheme of the invention is as follows:
an active magnetic distance measuring device suitable for well drilling collision prevention comprises,
the magnetic field intensity signal marking device is used for being installed on a sleeve of an adjacent well anti-collision well section, and a magnetic part is arranged on the magnetic field intensity signal marking device and is used for generating an additional magnetic field;
the magnetic induction while drilling detection device is used for being installed on a drilling bit;
and the analysis and calculation device is connected with the while-drilling magnetic induction detection device.
As a further technical scheme, the while-drilling magnetic induction detection device comprises,
a fluxgate sensor to receive and transmit magnetic signals to the analytics computing device.
As a further technical proposal, the magnetic field intensity signal marking device comprises,
the anti-collision device comprises a body, wherein a through hole is formed in the body and is used for being sleeved on a sleeve of an anti-collision well section of an adjacent well;
the diversion trench is arranged on the body;
a plurality of built-in holes are formed in the body in a circumferential mode, and the magnetic pieces are arranged in the built-in holes;
the magnetic column locking screw is arranged in the built-in hole, is positioned at one end of the magnetic part and is used for fixing the magnetic part under the coaction with the rubber gasket;
the locking sleeve screw hole is arranged on the flow guide groove and used for installing a screw to enable the body to be fixed with the adjacent well anti-collision well section sleeve.
As a further technical solution, the method comprises the following steps,
the body is made of high-strength aluminum alloy material.
As a further technical solution, the method comprises the following steps,
chamfers are arranged at two ends of the body.
An active magnetic ranging method suitable for well drilling collision prevention, which utilizes any one of the active magnetic ranging devices suitable for well drilling collision prevention to carry out detection, and comprises the following steps:
s1: two adjacent wells adjacent to a drilling well are respectively a first adjacent well and a second adjacent well, a plurality of magnetic field intensity signal marking devices are additionally arranged on the adjacent well anti-collision well section sleeves on the first adjacent well and the second adjacent well according to a designed specified distance, and the magnetic field intensity signal marking devices are arranged to reach an anti-collision well section along with the adjacent well anti-collision well section sleeves to generate an additional magnetic field;
s2: arranging the magnetic induction while drilling detection device on a positive drilling bit;
s3: when the drill bit for drilling the well drills to a first measurement position, stopping drilling the well, starting the magnetic induction detection device while drilling, and detecting and receiving an additional magnetic field signal sent by a first magnetic field signal marking device on the second adjacent well;
s4: the magnetic induction while drilling detection device transmits a received magnetic field signal to the analysis and calculation device arranged on the ground through a drilling fluid pressure pulse signal to obtain an actually measured BXY, calculates the actually measured BXY with a standard BXY of the position to obtain a delta BXY abnormal value, calculates a magnetic abnormal ratio, and compares the calculated magnetic abnormal ratio with a set magnetic abnormal value ratio;
s5: if the magnetic field intensity signal marking device is larger than the standard magnetic anomaly ratio, determining that the distance between the drilling bit and the magnetic field intensity signal marking device is smaller than a safety distance, and if collision risks exist, adjusting the direction of the drilling bit and drilling towards a safety position;
if the magnetic field intensity is smaller than the standard magnetic anomaly ratio, defining that the additional magnetic field of the magnetic field intensity signal marking device is not detected, determining that the distance between the drilling bit and the magnetic field intensity signal marking device is larger than the safe distance, and if no collision risk exists, continuing drilling without adjusting the direction of the drilling bit;
s6: and repeating S3-S5 until drilling is completed.
As a further technical solution, the method comprises the following steps,
the Δ BXY outlier = measured BXY-standard BXY;
the magnetic anomaly ratio% =100 × Δ BXY anomaly/standard BXY.
The working principle and the beneficial effects of the invention are as follows:
in the embodiment, in order to solve the problem of safe anti-collision of drilling, passive magnetic distance measurement is changed into active magnetic distance measurement, a magnetic field intensity signal marking device, a magnetic induction detection device while drilling and an analysis and calculation device are arranged, wherein the magnetic field intensity signal marking device can be rapidly fixed on a casing pipe of an anti-collision well section of an adjacent well on site when in use and can be put into a well, the magnetic field intensity signal marking device is arranged on the casing pipe of the anti-collision well section of the adjacent well at a specific distance, a magnetic part is arranged on the magnetic field intensity signal marking device, and the magnetic part can continuously emit a stable additional magnetic field with the intensity far larger than the original magnetic field intensity of the casing pipe.
The while-drilling magnetic induction detection device is arranged at the upper part of the drill bit for drilling, is vertically positioned at a distance of dozens of meters above the drill bit for drilling, generally seventeen meters, and can select an MWD (measurement while drilling) instrument for drilling, and after a magnetic field intensity signal marking device is additionally arranged, the magnetic field intensity is increased, so that the detection distance of the MWD instrument for drilling is expanded to 4m; the MWD while drilling instrument for drilling is utilized, the magnetic field signal of the additional magnetic field can be detected when the distance between the MWD while drilling instrument and the collision prevention well is 4m, the signal is transmitted to an analysis and calculation device on the ground, the analysis and calculation device is used for calculating and processing the magnetic signal, the direction and the distance of the magnetic signal are determined, and finally the drill bit for drilling is guided to adjust the direction and drill towards the direction of the collision prevention.
The scheme provides an active magnetic ranging anti-collision device capable of detecting magnetic signals in advance when the distance from an adjacent well casing is 4m, the magnetic ranging distance is increased, passive magnetic ranging anti-collision is changed into active magnetic ranging anti-collision, and the problem of needing to be solved is solved. The active magnetic ranging is that the magnetic field intensity of a target is increased and the magnetic detection distance is increased manually by a technical method, while the passive magnetic ranging is only used for measuring the change of the original target magnetic field, the magnetic measurement distance is small, and the active magnetic ranging is easy to collide with an adjacent well casing in the drilling process; the foreign active magnetic distance measuring technology is used for anti-collision operation, a well drilling tool needs to be lifted out of a well drilling tool, a special magnetic distance measuring device is used for well head cable descending, the construction process is complex, the measuring and analyzing period is long, the timeliness is poor, the operation cost is high, and the method is not suitable for domestic anti-collision well construction.
Through installing magnetic field intensity signal mark device additional in this scheme, will survey original weak casing string self magnetic field intensity, change into the additional magnetic field intensity after surveying the expansion, realize preventing bumping well initiative magnetic ranging and measuring, solved the easy difficult problem that bumps with adjacent well casing pipe among the drilling process, the operation flow is simple, can measure while drilling, the drilling time has been saved, and the equipment input cost is low, the drilling cost is reduced, prevent bumping effectually, well control safety risk has been eliminated, there is very high industrial use value.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of an active magnetic ranging method according to the present invention;
FIG. 2 is a graph showing the distance relationship between the trajectory of a well being drilled A and the first adjacent well B and the second adjacent well C in the present invention;
FIG. 3 is a schematic view of the structure of a magnetic field intensity signal marking device according to the present invention;
FIG. 4 is a schematic view of the structure of the magnetic member of the present invention;
in the figure: 1. the device comprises a magnetic field intensity signal marking device, 101, a magnetic part, 102, a body, 103, a diversion trench, 104, an internal hole, 105, a magnetic column locking screw, 106, a locking casing screw hole, 2, a magnetic induction detection device while drilling, 3, an adjacent well anti-collision well section casing, 4, a drilling bit in a drilling well, 5 and an analysis and calculation device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 inventive step, are intended to be within the scope of the present invention.
As shown in fig. 1 to 4, the present embodiment provides an active magnetic distance measuring device suitable for drilling anti-collision, which is characterized by comprising,
the magnetic field intensity signal marking device 1 is used for being installed on a casing 3 of an adjacent well anti-collision well section, a magnetic part 101 is arranged on the magnetic field intensity signal marking device 1, and the magnetic part 101 is used for generating an additional magnetic field;
the device comprises a while-drilling magnetic induction detection device 2, wherein the while-drilling magnetic induction detection device 2 is used for being installed on a drilling bit 4;
and the analysis and calculation device 5 is connected with the magnetic induction while drilling detection device 2 through the analysis and calculation device 5.
In the embodiment, in order to solve the problem of safe anti-collision of the drilling well, the passive magnetic distance measurement is changed into the active magnetic distance measurement, a magnetic field intensity signal marking device 1, a magnetic induction while drilling detection device 2 and an analysis and calculation device 5 are arranged, wherein the magnetic field intensity signal marking device 1 can be quickly fixed on a sleeve 3 of an anti-collision well section of an adjacent well on site when in use and can enter the well, the magnetic field intensity signal marking device 1 is arranged on the sleeve 3 of the anti-collision well section of the adjacent well at a specific distance, a magnetic part 101 is arranged on the magnetic field intensity signal marking device 1, and the magnetic part 101 can continuously emit a stable additional magnetic field with the intensity far greater than the original magnetic field intensity of the sleeve in the well.
The while-drilling magnetic induction detection device 2 is arranged at the upper part of the forward drilling drill bit 4, the while-drilling magnetic induction detection device 2 is vertically positioned above the forward drilling drill bit 4 by a distance of more than ten meters, generally seventeen meters, the while-drilling magnetic induction detection device 2 can select a forward drilling MWD while-drilling instrument, and after the magnetic field intensity signal marking device 1 is additionally arranged, the magnetic field intensity is increased, so that the detection distance of the MWD while-drilling instrument is expanded to 4 meters; the MWD while drilling instrument for drilling is utilized, a magnetic field signal of an additional magnetic field can be detected when the MWD while drilling instrument is 4 meters away from a collision prevention well, the signal is transmitted to an analysis and calculation device 5 on the ground, the analysis and calculation device 5 is used for calculating and processing the magnetic signal, the direction and the distance of the magnetic signal are determined, and finally the drill bit 4 for drilling is guided to adjust the direction and drill towards the safe collision prevention direction.
The scheme provides the active magnetic ranging anti-collision device capable of detecting the magnetic signal in advance when the distance from the adjacent well casing is 4m, the magnetic ranging distance is increased, the passive magnetic ranging anti-collision is changed into the active magnetic ranging anti-collision, and the problem which needs to be solved is solved. The active magnetic ranging is that the magnetic field intensity of a target is increased and the magnetic detection distance is increased manually by a technical method, while the passive magnetic ranging is only used for measuring the change of the original target magnetic field, the magnetic measurement distance is small, and the active magnetic ranging is easy to collide with an adjacent well casing in the drilling process; the foreign active magnetic distance measuring technology is used for anti-collision operation, a well drilling tool needs to be lifted out of a well drilling tool, a wellhead cable is adopted to enter a special magnetic distance measuring device, the construction process is complex, the measuring and analyzing period is long, the timeliness is poor, the operation cost is high, and the device is not suitable for domestic anti-collision well construction.
Through installing magnetic field intensity signal mark device 1 additional in this scheme, will survey original weak casing string self magnetic field intensity, change into the additional magnetic field intensity after surveying the expansion, realize preventing bumping well initiative magnetic ranging and measuring, solved the easy difficult problem that bumps with adjacent well casing pipe among the drilling process, the operation flow is simple, can measure while drilling, the drilling time has been saved, and equipment input cost is low, the drilling cost is reduced, prevent bumping effectually, well control safety risk has been eliminated, there is very high industrial use value.
Further, the while-drilling magnetic induction detection device 2 includes a fluxgate sensor for receiving and transmitting the magnetic signal to the analysis calculation device 5.
In this embodiment, the fluxgate sensor on the while-drilling magnetic induction detection device 2 may receive the direction of the magnetic line and the magnetic field strength actively emitted by the magnetic field strength signal marking device 1 in the downhole, and upload the magnetic line and the magnetic field strength to the analysis and calculation device 5 through the drilling fluid mud medium.
Further, the magnetic field strength signal marker 1 comprises,
the body 102, the body 102 is provided with a through hole, and the through hole is used for sleeving the adjacent well anti-collision well section casing 3;
the diversion trench 103, the diversion trench 103 is set up on the body 102;
a plurality of built-in holes 104, wherein the built-in holes 104 are circumferentially arranged on the body 102, and the magnetic member 101 is arranged in the built-in holes 104;
the magnetic column locking screw 105 is arranged in the built-in hole 104, is positioned at one end of the magnetic part 101 and is used for fixing the magnetic part 101 under the coaction with the rubber gasket;
and the locking sleeve screw hole 106 is formed in the diversion trench 103, and the locking sleeve screw hole 106 is used for installing a screw to fix the body 102 and the adjacent well collision prevention well section sleeve 3.
In this embodiment, in order to facilitate installation of the magnetic field strength signal marking device 1 and installation of the magnetic member 101 on the magnetic field strength signal marking device 1, the magnetic field strength signal marking device 1 includes a body 102, a guiding groove 103, a built-in hole 104, a magnetic column locking screw 105, and a locking sleeve screw hole 106; the body 102 is provided with a through hole, the adjacent well anti-collision section casing 3 penetrates through the through hole, and the body 102 is sleeved on the adjacent well anti-collision section casing 3. In order to smoothly provide drilling fluid in the process of preventing the casing pipe 3 of the well collision section of the lower adjacent well, 4 vertical diversion grooves 103 which are parallel to the axis and have the width of 25mm are arranged on the outer side of the body 102, and the requirement of well cementation displacement efficiency can be met.
By taking the center of the through hole as the center of a circle, 8 rows of built-in holes 104 which are 15mm in diameter and can be provided with the magnetic part 101 are circumferentially arranged on the body 102, the magnetic part 101 is a cylindrical permanent magnet, when the underground temperature is less than 200 ℃, a magnetic source is stable and does not demagnetize, and the magnetic flux of the magnetic column with the diameter of 15mm is more than 500GS; a screw thread is turned at one end of the built-in hole 104, and the magnetic column locking screw 105 and the rubber gasket act together to fix and seal the magnetic part 101 in the built-in hole 104; the locking sleeve screw hole 106 is arranged on the body 102 along the direction vertical to the circular section of the body 102, and a bolt is screwed in from the locking sleeve screw hole 106, so that the adjacent well anti-collision well section sleeve 3 is tightly combined with the body 102 without displacement.
In order to reduce the floor space of the magnetic field intensity signal marking device 1, the locking sleeve screw hole 106 is generally arranged on the diversion trench 103, and even if a bulge exists after the bolt is tightened, the height of the bolt does not exceed the height of the outer surface of the body 102.
Further, the body 102 is made of a high-strength aluminum alloy material.
In this embodiment, because the magnetic member 101 is disposed in the body 102 in a closed manner, in order to prevent the magnetic field of the magnetic member 101 from being affected by shielding, the body 102 is made of a high-strength aluminum alloy material, and normal emission of magnetic lines of force of the magnetic member 101 can be realized.
Further, chamfers are provided at both ends of the body 102.
In this embodiment, for the convenience of installing on adjacent well anti-collision well section casing 3 for magnetic field intensity signal marking device 1 back, adjacent well anti-collision well section casing 3 can go into safely, is provided with 45 chamfers at body 102 both ends to set up locking sleeve screw 106 on guiding gutter 103, and the external diameter of body 102 is the same with sleeve pipe rigidity centralizer, can ensure the sleeve pipe like this and be placed in the middle, is favorable to improving the well cementation quality.
An active magnetic ranging method suitable for well drilling collision prevention is used for detection by using any one of the active magnetic ranging devices suitable for well drilling collision prevention, and is characterized by comprising the following steps of:
s1: two adjacent wells adjacent to a well being drilled are respectively a first adjacent well and a second adjacent well, a plurality of magnetic field strength signal marking devices 1 are additionally arranged on adjacent well anti-collision well section sleeves 3 on the first adjacent well and the second adjacent well according to a designed specified distance, and the magnetic field strength signal marking devices 1 go down to an anti-collision well section along with the adjacent well anti-collision well section sleeves 3 to generate an additional magnetic field;
s2: arranging a magnetic induction detection while drilling device 2 on a drill bit 4 for drilling;
s3: when the forward drilling drill bit 4 drills to a first measurement position, stopping drilling, starting the magnetic induction detection device 2 while drilling, and detecting and receiving an additional magnetic field signal sent by a first magnetic field intensity signal marking device 1 on a second adjacent well;
s4: the magnetic induction while drilling detection device 2 transmits the received magnetic field signal to an analysis and calculation device 5 arranged on the ground through a drilling fluid pressure pulse signal to obtain an actually measured BXY, calculates the actually measured BXY with a standard BXY of the position to obtain a delta BXY abnormal value, calculates a magnetic abnormal ratio, and compares the calculated magnetic abnormal ratio with a set magnetic abnormal value ratio;
s5: if the magnetic anomaly ratio is larger than the standard magnetic anomaly ratio, the distance between the drilling bit 4 and the magnetic field intensity signal marking device 1 is determined to be smaller than the safety distance, the collision risk exists, the direction of the drilling bit 4 is adjusted, and the well is drilled to the safety position;
if the magnetic anomaly ratio is smaller than the standard magnetic anomaly ratio, defining that the additional magnetic field of the magnetic field intensity signal marking device 1 is not detected, determining that the distance between the drilling bit 4 and the magnetic field intensity signal marking device 1 is larger than the safety distance, and if no collision risk exists, continuing drilling without adjusting the direction of the drilling bit 4;
s6: and repeating S3-S5 until drilling is completed.
In the embodiment, the steps of adjusting the angle of the drill bit in the well drilling and realizing the anti-collision are achieved by using the active magnetic distance measuring device for preventing the well drilling from collision as follows;
s1: magnetic field intensity signal marking devices 1 are arranged on adjacent well anti-collision well section casings 3 of two adjacent wells, namely a first adjacent well and a second adjacent well, and the first adjacent well is provided with one magnetic field intensity signal marking device 1 every 50 meters from 200m underground; and a magnetic field intensity signal marking device 1 is arranged every 40 meters of the second adjacent well from 200m underground, and after the sleeve 3 of the collision-proof well section of the adjacent well is put into the well for well cementation, the magnetic field intensity signal marking device 1 emits a stable additional magnetic field.
S2: arranging a magnetic induction detection device 2 while drilling on a drill bit 4 of a well, and measuring magnetic field parameters of a magnetic field intensity signal marking device 1 on a casing 3 of an adjacent well anti-collision well section along with the depth of the drill bit;
s3: the first underground measurement position is the position of a second adjacent well which is 240m underground, when the drill bit 4 of the forward drilling well drills to the measurement position, the forward drilling well stops drilling, and the magnetic induction detection device 2 while drilling is started to carry out magnetic field measurement on the magnetic field intensity signal marking device 1 at the position;
s4: the while-drilling magnetic induction detection device 2 transmits a received magnetic field signal to an analysis and calculation device 5 arranged on the ground through a drilling fluid pressure pulse signal to obtain an actually measured BXY, calculates the actually measured BXY with a standard BXY at the position to obtain a delta BXY abnormal value, calculates a magnetic abnormal ratio, and compares the calculated magnetic abnormal ratio with a set magnetic abnormal value ratio to set the magnetic abnormal value ratio to be 3%;
s5: if the magnetic anomaly percentage is more than 3%, determining that the distance between the drilling bit 4 and the magnetic field intensity signal marking device 1 is less than the safety distance, and if the collision risk exists, adjusting the direction of the drilling bit 4 and drilling towards a safety position;
if the magnetic anomaly proportion is less than 3%, defining that the additional magnetic field of the magnetic field intensity signal marking device 1 is not detected, determining that the distance between the drilling bit 4 and the magnetic field intensity signal marking device 1 is greater than the safety distance, and if no collision risk exists, not adjusting the direction of the drilling bit 4 and continuing drilling;
s6: and repeating S3-S5 until drilling is completed.
The first table shows the magnetic field distance between the measuring point A of the main drilling well and the cased well of the first adjacent well B and the second adjacent well C
Further, Δ BXY outlier = measured BXY-standard BXY;
magnetic anomaly ratio% =100 ×. Δ BXY anomaly/standard BXY.
In this embodiment, the downhole depths are different, the standard BXY is also different, and sometimes the magnetic anomaly ratio is larger than 3%, but the actual distance is larger than 4m, and the Δ BXY anomaly value = the measured BXY-standard BXY; magnetic anomaly ratio% =100 ×. Δ BXY anomaly/standard BXY.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An active magnetic distance measuring device suitable for well drilling collision prevention is characterized by comprising,
the magnetic field intensity signal marking device (1) is used for being installed on a casing (3) of an adjacent well anti-collision well section, a magnetic part (101) is arranged on the magnetic field intensity signal marking device (1), and the magnetic part (101) is used for generating an additional magnetic field;
the device comprises a while-drilling magnetic induction detection device (2), wherein the while-drilling magnetic induction detection device (2) is used for being installed on a drilling bit (4);
the analysis and calculation device (5), the analysis and calculation device (5) is connected with the while-drilling magnetic induction detection device (2);
two adjacent wells adjacent to the well under drilling are respectively a first adjacent well and a second adjacent well, wherein the first adjacent well starts from 200m underground, and a magnetic field intensity signal marking device (1) is arranged every 50 m; the second adjacent well is provided with a magnetic field intensity signal marking device (1) every 40 meters from 200m underground;
the magnetic field strength signal marking device (1) comprises,
the anti-collision device comprises a body (102), wherein a through hole is formed in the body (102) and is used for being sleeved on a casing (3) of an adjacent well anti-collision well section;
the diversion trench (103), the diversion trench (103) is arranged on the body (102);
a plurality of built-in holes (104), wherein the built-in holes (104) are circumferentially arranged on the body (102), and the magnetic part (101) is arranged in the built-in holes (104);
the magnetic column locking screw (105) is arranged in the built-in hole (104), is positioned at one end of the magnetic part (101), and is used for fixing the magnetic part (101) under the coaction with a rubber gasket;
the locking sleeve screw hole (106) is formed in the diversion trench (103), and the locking sleeve screw hole (106) is used for installing a screw to enable the body (102) and the adjacent well anti-collision well section sleeve (3) to be fixed.
2. The active magnetic distance measuring device suitable for well drilling collision prevention according to claim 1, wherein the magnetic induction while drilling detection device (2) comprises,
a fluxgate sensor for receiving and transmitting magnetic signals to the analysis computing device (5).
3. The active magnetic ranging device for drilling anti-collision according to claim 1,
the body (102) is made of high-strength aluminum alloy material.
4. The active magnetic ranging device for drilling anti-collision according to claim 1,
chamfers are arranged at two ends of the body (102).
5. An active magnetic ranging method suitable for well drilling collision prevention, which is used for detection by the active magnetic ranging device suitable for well drilling collision prevention of any one of claims 1-4, and is characterized by comprising the following steps:
s1: two adjacent wells adjacent to a drilling well are respectively a first adjacent well and a second adjacent well, a plurality of magnetic field intensity signal marking devices (1) are additionally arranged on the adjacent well anti-collision well section casing pipes (3) on the first adjacent well and the second adjacent well according to a designed specified distance, and the magnetic field intensity signal marking devices (1) go down to an anti-collision well section along with the adjacent well anti-collision well section casing pipes (3) to generate an additional magnetic field;
s2: arranging the magnetic induction while drilling detection device (2) on a drill bit (4) for drilling;
s3: when the forward drilling drill bit (4) drills to a first measurement position, stopping drilling, starting the magnetic induction while drilling detection device (2), and detecting and receiving an additional magnetic field signal sent by a first magnetic field signal marking device (1) on the second adjacent well;
s4: the magnetic induction while drilling detection device (2) transmits a received magnetic field signal to the analysis and calculation device (5) arranged on the ground through a drilling fluid pressure pulse signal to obtain an actually measured BXY, calculates the actually measured BXY with a standard BXY at the position to obtain a delta BXY abnormal value, calculates a magnetic abnormal ratio, and compares the calculated magnetic abnormal ratio with a set magnetic abnormal value ratio;
s5: if the magnetic field intensity is larger than the standard magnetic anomaly ratio, the distance between the drilling bit (4) and the magnetic field intensity signal marking device (1) is determined to be smaller than the safety distance, the collision risk exists, the direction of the drilling bit (4) is adjusted, and the drilling is carried out towards the safety position;
if the magnetic field intensity is smaller than the standard magnetic anomaly ratio, defining that the additional magnetic field of the magnetic field intensity signal marking device (1) is not detected, determining that the distance between the drilling bit (4) and the magnetic field intensity signal marking device (1) is larger than the safety distance, and if no collision risk exists, continuing drilling without adjusting the direction of the drilling bit (4);
s6: and repeating S3-S5 until the well drilling is completed.
6. The active magnetic ranging method for drilling anti-collision according to claim 5,
the delta BXY outlier = measured BXY-standard BXY;
the magnetic anomaly ratio% =100 × Δ BXY anomaly/standard BXY.
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| CN114033353B (en) * | 2021-11-15 | 2022-11-08 | 中国石油天然气集团有限公司 | Electromagnetic positioning method and system for well track |
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Denomination of invention: An active magnetic ranging device and method suitable for drilling anti-collision Effective date of registration: 20231213 Granted publication date: 20221220 Pledgee: Agricultural Bank of China Limited Wuqiang County Branch Pledgor: JING HONG OIL DRILLING ENGINEERING TECHNOLOGY CO.,LTD. Registration number: Y2023980071440 |
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