Passive magnetic ranging and anti-collision method and device

Abstract

The present invention relates to the technical field of directional well drilling, and is a passive magnetic ranging anti-collision method and device, the former comprising analyzing and obtaining the well section that needs anti-collision treatment during drilling, and obtaining the corresponding well section information; obtaining the magnetic induction intensity at the location of the drilling, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field; and determining the spatial well spacing between the drilled well and the well being drilled. The present invention does not require magnetic excitation of the adjacent drilled well or the addition of a downhole magnetic source, but obtains and utilizes the magnetic induction intensity at the location of the drilling, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field to determine the spatial well spacing between the drilled well and the well being drilled, which can greatly improve the drilling operation efficiency, reduce costs, and improve timeliness.

Description

Technical Field

[0001] The invention relates to the technical field of directional well drilling, and relates to a passive magnetic ranging anti-collision method and device. Background Art

[0002] At present, the commonly used wellbore collision prevention method in oil fields is to fit the wellbore trajectory using the measured wellbore trajectory parameters, use the collision prevention scanning algorithm to calculate the positional relationship between the wellbore trajectory of the drilled well and the adjacent well, and issue an early warning when the relative distance is less than the safe distance, and take active obstacle avoidance measures to avoid the occurrence of wellbore collision accidents. However, due to errors in measuring instruments and calculation models, this type of method is not ideal in the collision prevention process of dense cluster wells. In recent years, a series of new wellbore collision prevention technologies have been developed at home and abroad, including drill bit vibration signal collision prevention technology, acoustic wave detection collision prevention technology, and electromagnetic wave detection collision prevention technology, but it is necessary to magnetically excite the adjacent drilled wells or add downhole magnetic sources, and the calculation is complex, the cost is high, and the drilling efficiency is low. Summary of the invention

[0003] The present invention provides a passive magnetic ranging anti-collision method and device, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem of the existing wellbore anti-collision method that it is necessary to magnetically excite adjacent drilled wells or add downhole magnetic sources, which is costly.

[0004] One of the technical solutions of the present invention is achieved by the following measures: a passive magnetic ranging anti-collision method, comprising:

[0005] Determine the drilled wells adjacent to the drilling well, analyze and obtain the well section of the drilling well that needs anti-collision treatment, and obtain the corresponding well section information, where the well section information includes: well depth, scanning radius and scanning angle;

[0006] When drilling reaches the well section that needs anti-collision treatment, the magnetic induction intensity at the drilling location, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent drilled casing under the influence of the geomagnetic field are obtained;

[0007] The spatial well spacing R between the drilled well and the drilling well is determined by the following formula using the magnetic induction intensity at the drilling location, the triaxial gravity acceleration intensity generated by the gravity field, and the triaxial magnetic induction intensity of the static magnetic field of the adjacent drilled well casing under the influence of the geomagnetic field;

[0008] B G =(1-μ0)R cosθ+(1-μ0)R sinθ+1 / 2(1+μ0)R sin 2θ

[0009] Among them, B Gis the casing magnetic field value of the adjacent drilled casing; θ is the azimuth from the center of the circle of the drilling wellbore to the center of the drilled wellbore; μ0 is the correction coefficient of the drilling casing magnetic interference corresponding to the azimuth and distance.

[0010] The following are further optimizations and / or improvements to the above technical solutions:

[0011] The above method uses the magnetic induction intensity at the location of the well being drilled, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the casing of the adjacent well being drilled under the influence of the geomagnetic field to determine the spatial well spacing R between the well being drilled and the well being drilled, including:

[0012] According to the triaxial magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, the magnetic induction intensity B of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field is determined. T ;

[0013]

[0014] Among them, B TX , B TY , B TZ They are the components of the static magnetic field of the adjacent well casing in the three axial directions of X, Y and Z under the influence of the geomagnetic field;

[0015] Determine the casing magnetic field value B of the adjacent drilled casing G ;

[0016] B G =B T -B

[0017] Among them, B T is the magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field; B is the magnetic induction intensity at the location of the drilling;

[0018] According to the three-axis gravity acceleration intensity generated by the gravity field and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, the azimuth angle θ from the center of the circle of the wellbore being drilled to the center of the wellbore being drilled is determined;

[0019]

[0020] Among them, B TX , B TY , B TZ are the components of the static magnetic field of the adjacent well casing in the three axial directions of X, Y, and Z under the influence of the geomagnetic field; G X , G Y are the components of the gravity field in the X and Y axial directions respectively;

[0021] Determine the spatial well spacing R between the drilled wells and the wells being drilled;

[0022] B G =(1-μ0)R cosθ+(1-μ0)R sinθ+1 / 2(1+μ0)R sin 2θ

[0023] Among them, B G is the casing magnetic field value of the adjacent drilled casing; θ is the azimuth from the center of the circle of the drilling wellbore to the center of the drilled wellbore; μ0 is the correction coefficient of the drilling casing magnetic interference corresponding to the azimuth and distance.

[0024] The above-mentioned determination of the drilled wells adjacent to the drilling well, analysis and acquisition of the well section of the drilling well that needs anti-collision treatment, and acquisition of the corresponding well section information include:

[0025] Identify the drilled wells adjacent to the well being drilled;

[0026] Taking the coordinates of the wellhead of the drilled well as the reference, determine the coordinate relationship between the drilled well and the well being drilled;

[0027] Set the acquisition interval, and obtain the adjacent well separation coefficients at different measuring points in the wellbore trajectory being drilled according to the acquisition interval;

[0028] Determine whether the separation coefficient of adjacent wells is greater than the threshold value;

[0029] In response to this, the corresponding well section is determined as the well section that needs to be processed for anti-collision, and the well section information of the well section is obtained.

[0030] The above acquisition interval is a drilling distance interval, and the adjacent well separation coefficient at each measuring point position in the wellbore trajectory being drilled is obtained according to the drilling distance interval.

[0031] The second technical solution of the present invention is achieved by the following measures: a passive magnetic ranging and anti-collision device, including a ground control system and a downhole detection assembly;

[0032] The ground control system determines the drilled wells adjacent to the well being drilled, analyzes and obtains the well sections of the well being drilled that require anti-collision treatment, and obtains the corresponding well section information; controls the downhole detection assembly to obtain data in each well section, and receives the spatial well spacing R between the drilled well and the well being drilled;

[0033] The downhole detection assembly collects anti-collision drilling data when drilling reaches a well section that requires anti-collision treatment. The anti-collision drilling data includes obtaining the magnetic induction intensity at the location where the well is being drilled, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field; using the magnetic induction intensity at the location where the well is being drilled, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, the spatial well spacing R between the well and the well being drilled is determined by the following formula;

[0034] B G =(1-μ0)R cosθ+(1-μ0)R sinθ+1 / 2(1+μ0)R sin 2θ

[0035] Among them, B G is the casing magnetic field value of the drilled casing in the current well; θ is the azimuth from the center of the circle of the drilling wellbore to the center of the drilled wellbore; μ0 is the correction coefficient of the drilling casing magnetic interference corresponding to the azimuth and distance.

[0036] The following are further optimizations and / or improvements to the above technical solutions:

[0037] The above-mentioned downhole detection assembly includes a high-precision downhole measurement probe, an MWD signal transmission unit and a high-power mud turbine generator;

[0038] A high-precision downhole measurement probe collects anti-collision drilling data when drilling reaches a well section that requires anti-collision treatment. The anti-collision drilling data includes obtaining the magnetic induction intensity at the location of the drilling well, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field; using the magnetic induction intensity at the location of the drilling well, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, the spatial well spacing R between the drilled well and the drilling well is determined by the following formula;

[0039] B G =(1-μ0)R cosθ+(1-μ0)R sinθ+1 / 2(1+μ0)R sin 2θ

[0040] Among them, B G is the casing magnetic field value of the drilled casing in the current well; θ is the azimuth angle from the center of the circle of the drilling wellbore to the center of the drilled wellbore; μ0 is the correction coefficient of the drilling casing magnetic interference corresponding to the azimuth and distance;

[0041] The MWD signal transmission unit transmits the received spatial well spacing R between the drilled well and the drilling well, and converts the AC power output by the high-power mud turbine generator into DC power to power the high-precision downhole measurement probe;

[0042] The high-power mud turbine generator supplies power to the high-precision downhole measurement probe through the MWD signal transmission unit.

[0043] The above-mentioned high-precision downhole measurement probe includes a high-antimagnetic beryllium bronze protective shell with closed two ends. A pressure sensor, a temperature sensor, a microcontroller module, a power module, a high-precision three-axis fluxgate sensor and a high-precision three-axis acceleration sensor are arranged in the high-antimagnetic beryllium bronze protective shell. The pressure sensor, the temperature sensor, the power module, the high-precision three-axis fluxgate sensor and the high-precision three-axis acceleration sensor are all connected to the microcontroller module.

[0044] The MWD signal transmission unit includes a microcontroller module, an AC / DC conversion module and a pulse generator. The high-precision downhole measurement probe is connected to the microcontroller module and the AC / DC conversion module respectively. The microcontroller module is connected to the pulse generator and the AC / DC conversion module respectively.

[0045] The present invention analyzes and obtains the well section that needs anti-collision treatment during drilling. When entering the well section that needs anti-collision treatment, the magnetic induction intensity at the location of the drilling well, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field are obtained to determine the spatial well spacing between the drilled well and the drilling well, providing more reliable and accurate data support for directional well engineers to control the wellbore trajectory and reduce the risk of collision between the two wells. The technical solution disclosed in the embodiment of the present invention does not require magnetic excitation of adjacent drilled wells or the addition of downhole magnetic sources, which can greatly improve the efficiency of drilling operations, reduce costs, and improve timeliness. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Attached Figure 1 This is a flow chart of the method of Example 1 of the present invention.

[0047] Attached Figure 2 This is a flow chart of a method for determining the spatial well spacing between a drilled well and a well being drilled in Example 2 of the present invention.

[0048] Attached Figure 3 This is a flow chart of a method for analyzing and obtaining a well section that requires anti-collision processing during drilling in Example 3 of the present invention.

[0049] Attached Figure 4 This is a schematic diagram of the device structure of Example 4 of the present invention.

[0050] Attached Figure 5 It is a schematic diagram of the device structure of Example 5 and Example 6 of the present invention. DETAILED DESCRIPTION

[0051] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0052] The present invention will be further described below in conjunction with embodiments and drawings:

[0053] Embodiment 1: As attached Figure 1 As shown, an embodiment of the present invention discloses a passive magnetic ranging anti-collision method, comprising:

[0054] Step S101, determine the drilled wells adjacent to the drilling well, analyze and obtain the well section of the drilling well that needs anti-collision treatment, and obtain the corresponding well section information; the well section information here includes: well depth, scanning radius and scanning angle, etc.

[0055] Step S102, when drilling reaches a well section that requires anti-collision treatment, obtain the magnetic induction intensity at the drilling location, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent drilled casing under the influence of the geomagnetic field.

[0056] Step S103, using the magnetic induction intensity at the location of the well being drilled, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the casing of the adjacent well being drilled under the influence of the geomagnetic field, the spatial well spacing R between the well being drilled and the well being drilled is determined by the following formula;

[0057] B G =(1-μ0)R cosθ+(1-μ0)R sinθ+1 / 2(1+μ0)R sin 2θ

[0058] Among them, B G is the casing magnetic field value of the adjacent drilled casing; θ is the azimuth from the center of the circle of the drilling wellbore to the center of the drilled wellbore; μ0 is the correction coefficient of the drilling casing magnetic interference corresponding to the azimuth and distance.

[0059] The embodiment of the present invention discloses a passive magnetic ranging anti-collision method, which analyzes and obtains the well section that needs anti-collision treatment during drilling, obtains the magnetic induction intensity at the location of the drilling, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, and determines the spatial well spacing R between the drilled well and the drilling well, providing more reliable and accurate data support for directional well engineers to control the wellbore trajectory, and reducing the risk of collision between the two wells. The technical solution disclosed in the embodiment of the present invention does not require magnetic excitation of adjacent drilled wells or the addition of downhole magnetic sources, which can greatly improve the efficiency of drilling operations, reduce costs, and improve timeliness.

[0060] Embodiment 2: As attached Figure 2As shown, the embodiment of the present invention discloses a passive magnetic ranging anti-collision method, wherein the spatial well spacing R between the drilled well and the drilling well is determined by obtaining the magnetic induction intensity at the location of the drilling well, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent drilled well casing under the influence of the geomagnetic field, and further comprising:

[0061] Step S201, according to the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, determine and obtain the magnetic induction intensity B of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field T ;

[0062]

[0063] Among them, B TX , B TY , B TZ are respectively the components of the static magnetic field of the adjacent well casing in the three axial directions of X, Y and Z under the influence of the geomagnetic field, that is, the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field;

[0064] Step S202, determining the casing magnetic field value B of the adjacent drilled casing G ;

[0065] B G =B T -B

[0066] Among them, B T is the magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field; B is the magnetic induction intensity at the location of the drilling well, that is, the magnetic induction intensity at the wellhead of the drilling well;

[0067] Step S203, determining the azimuth angle θ from the center of the circle with the drilling wellbore as the center to the center of the drilled wellbore according to the three-axis gravity acceleration intensity generated by the gravity field and the three-axis magnetic induction intensity of the static magnetic field of the adjacent drilled casing under the influence of the geomagnetic field;

[0068]

[0069] Among them, B TX , B TY , B TZ are the components of the static magnetic field of the adjacent well casing in the three axial directions of X, Y, and Z under the influence of the geomagnetic field; G X , G Y are the components of the gravity field in the X and Y axial directions respectively;

[0070] Step S204, determining the spatial well spacing R between the drilled well and the well being drilled;

[0071] B G=(1-μ0)R cosθ+(1-μ0)R sinθ+1 / 2(1+μ0)R sin 2θ

[0072] Among them, B G is the casing magnetic field value of the adjacent drilled casing; θ is the azimuth from the center of the circle of the drilling wellbore to the center of the drilled wellbore; μ0 is the correction coefficient of the drilling casing magnetic interference corresponding to the azimuth and distance.

[0073] Embodiment 3: As attached Figure 3 As shown, the embodiment of the present invention discloses a passive magnetic ranging anti-collision method, wherein a drilled well adjacent to a drilling well is determined, a well section of the drilling well that needs anti-collision processing is analyzed and obtained, and corresponding well section information is obtained, further comprising:

[0074] Step 301, determining a drilled well adjacent to the well being drilled;

[0075] Step 302, using the coordinates of the wellhead of the drilled well as a reference, determining the coordinate relationship between the drilled well and the well being drilled;

[0076] Here, after determining the drilled wells adjacent to the well being drilled in step 301, the data of the adjacent wells and the borehole trajectory design of the well being drilled are collected, wherein the data of the adjacent wells include: wellbore structure, measured wellhead coordinates, actual drilling trajectory data, ground elevation, turntable surface elevation, measurement time, magnetic declination during measurement, reference depth, magnetic declination, convergence angle, etc., and at the same time, the well section with missing trajectory is re-measured using a gyro inclinometer. The borehole trajectory design data of the well being drilled include: wellbore structure, measured wellhead coordinates, ground elevation, turntable surface elevation, depth measurement, vertical depth, well inclination, azimuth, magnetic declination, convergence angle, etc. of the designed trajectory of the well being drilled. Using the data of the adjacent wells and the borehole trajectory design of the well being drilled, the coordinate relationship between the drilled well and the well being drilled is determined with the wellhead coordinates of the drilled well as the reference.

[0077] Step 303, setting an acquisition interval, and acquiring the adjacent well separation coefficients at different measuring points in the wellbore trajectory being drilled according to the acquisition interval;

[0078] The acquisition interval here is the drilling distance interval, and the range can be set to no more than 10m according to needs. According to the acquisition interval, at each measuring point, according to the trajectory design data of the well being drilled and the actual drilling trajectory data of the adjacent wells, the closest distance scanning method (or plane distance scanning or normal distance scanning can also be selected depending on the specific situation) is used for calculation and adjacent well separation coefficient calculation to obtain anti-collision scanning diagrams of the depth measurement and scanning radius and adjacent well separation coefficient at different measuring points.

[0079] Step 304, determining whether the adjacent well separation coefficient is greater than a threshold value; the threshold value of the adjacent well separation coefficient is set in combination with the well spacing and the actual geological conditions of the drilled formation.

[0080] Step 305, if the response is yes, the corresponding well section is determined as a well section that needs to be processed for anti-collision, and the well section information of the well section is obtained. If the response is no, the corresponding well section is a well section of normal drilling operation. Here, the well section information of the well section is obtained through the anti-collision scanning diagram of the depth measurement and scanning radius and separation coefficient at the same measuring point.

[0081] Embodiment 4: As attached Figure 4 As shown, an embodiment of the present invention discloses a passive magnetic ranging and anti-collision device, including a ground control system and a downhole detection assembly;

[0082] The ground control system determines the drilled wells adjacent to the well being drilled, analyzes and obtains the well sections of the well being drilled that require anti-collision treatment, and obtains the corresponding well section information; controls the downhole detection assembly to obtain data in each well section, and receives the spatial well spacing R between the drilled well and the well being drilled;

[0083] The downhole detection assembly collects anti-collision drilling data when drilling reaches a well section that requires anti-collision treatment. The anti-collision drilling data includes obtaining the magnetic induction intensity at the location where the well is being drilled, the three-axis gravity acceleration intensity generated by the gravity field at the corresponding moment, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field; using the magnetic induction intensity at the location where the well is being drilled, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, the spatial well spacing R between the well and the well being drilled is determined by the following formula;

[0084] B G =(1-μ0)R cosθ+(1-μ0)R sinθ+1 / 2(1+μ0)R sin 2θ

[0085] Among them, B G is the casing magnetic field value of the drilled casing in the current well; θ is the azimuth from the center of the circle of the drilling wellbore to the center of the drilled wellbore; μ0 is the correction coefficient of the drilling casing magnetic interference corresponding to the azimuth and distance.

[0086] Embodiment 5: As attached Figure 5 As shown, an embodiment of the present invention discloses a passive magnetic ranging and anti-collision device, wherein the downhole detection assembly further includes a high-precision downhole measurement probe, an MWD signal transmission unit and a high-power mud turbine generator;

[0087] A high-precision downhole measurement probe collects anti-collision drilling data when drilling reaches a well section that requires anti-collision treatment. The anti-collision drilling data includes obtaining the magnetic induction intensity at the location of the drilling well, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field; using the magnetic induction intensity at the location of the drilling well, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, the spatial well spacing R between the drilled well and the drilling well is determined by the following formula;

[0088] B G =(1-μ0)R cosθ+(1-μ0)R sinθ+1 / 2(1+μ0)R sin 2θ

[0089] Among them, B G is the casing magnetic field value of the drilled casing in the current well; θ is the azimuth from the center of the circle of the drilling wellbore to the center of the drilled wellbore; μ0 is the correction coefficient of the drilling casing magnetic interference corresponding to the azimuth and distance.

[0090] Here, the high-precision downhole measurement probe has two working modes, namely normal drilling mode and anti-collision drilling mode. The specific execution process is: in the normal drilling section, the normal drilling mode is executed, and the high-precision downhole measurement probe collects normal drilling data, that is, measures the three-axis gravity acceleration intensity generated by the gravity field and the three-axis magnetic induction intensity generated by the geomagnetic field; in the section where anti-collision processing is required, the anti-collision drilling mode is executed, and the high-precision downhole measurement probe collects anti-collision drilling data, that is, measures the magnetic induction intensity at the location where the well is being drilled, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent drilled casing under the influence of the geomagnetic field, and uses the magnetic induction intensity at the location where the well is being drilled, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent drilled casing under the influence of the geomagnetic field to determine the spatial well spacing R between the drilled well and the well being drilled, and transmits it to the MWD signal transmission unit.

[0091] The MWD signal transmission unit transmits the received spatial well spacing R between the drilled well and the drilling well, and at the same time converts the AC power output by the high-power mud turbine generator into DC power to power the high-precision downhole measurement probe.

[0092] Here, the MWD signal transmission unit pulse encodes the received spatial well spacing R between the drilled well and the drilling well, and then transmits it to the ground control system via pulses.

[0093] The high-power mud turbine generator supplies power to the high-precision downhole measurement probe through the MWD signal transmission unit.

[0094] Embodiment 6: As attached Figure 5As shown, an embodiment of the present invention discloses a passive magnetic ranging anti-collision device, wherein the high-precision downhole measuring probe further includes a high-antimagnetic beryllium bronze protective shell with closed ends, and a pressure sensor, a temperature sensor, a microcontroller module, a power module, a high-precision three-axis fluxgate sensor and a high-precision three-axis acceleration sensor are arranged in the high-antimagnetic beryllium bronze protective shell, and the pressure sensor, the temperature sensor, the power module, the high-precision three-axis fluxgate sensor and the high-precision three-axis acceleration sensor are all connected to the microcontroller module; the MWD signal transmission unit further includes a microcontroller module, an AC-DC conversion module and a pulse generator, the high-precision downhole measuring probe is respectively connected to the microcontroller module and the AC-DC conversion module, and the microcontroller module is respectively connected to the pulse generator and the AC-DC conversion module.

[0095] The pressure sensor, temperature sensor, microcontroller module, power module, high-precision three-axis fluxgate sensor and high-precision three-axis acceleration sensor in the high-precision downhole measurement probe are arranged on the same PCB board, and the high-precision three-axis fluxgate sensor and the high-precision three-axis acceleration sensor are arranged in parallel; the pressure sensor and the temperature sensor collect pressure data and temperature data during the drilling process, the temperature data is used for circuit compensation to ensure the calculation accuracy of the spatial well spacing R between the drilled well and the well being drilled, the high-precision three-axis fluxgate sensor and the high-precision three-axis acceleration sensor are used to collect the magnetic induction intensity at the location of the well being drilled, the three-axis magnetic induction intensity generated by the geomagnetic field, the three-axis gravity acceleration intensity generated by the gravity field and the three-axis magnetic induction intensity of the static magnetic field of the adjacent drilled casing under the influence of the geomagnetic field, and the microcontroller module uses the three-axis gravity acceleration intensity generated by the gravity field and the three-axis magnetic induction intensity of the static magnetic field of the adjacent drilled casing under the influence of the geomagnetic field to determine the spatial well spacing R between the drilled well and the well being drilled.

[0096] The microcontroller module in the MWD signal transmission unit performs pulse encoding on the received spatial well spacing R between the drilled well and the well being drilled, the pulse generator sends a pulse signal, transmits the spatial well spacing R between the drilled well and the well being drilled back to the ground, and the AC / DC conversion module performs AC / DC conversion.

[0097] The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A passive magnetic ranging anti-collision method, characterized in that: include: Determine the drilled wells adjacent to the drilling well, analyze and obtain the well section of the drilling well that needs anti-collision treatment, and obtain the corresponding well section information, where the well section information includes: well depth, scanning radius and scanning angle; When drilling reaches the well section that needs anti-collision treatment, the magnetic induction intensity at the drilling location, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent drilled casing under the influence of the geomagnetic field are obtained; The spatial well spacing R between the drilled well and the well being drilled is determined by using the magnetic induction intensity at the location of the well being drilled, the triaxial gravity acceleration intensity generated by the gravity field, and the triaxial magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, including: According to the triaxial magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, the magnetic induction intensity B of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field is determined. T ; Among them, B TX , B TY , B TZ They are the components of the static magnetic field of the adjacent well casing in the three axial directions of X, Y and Z under the influence of the geomagnetic field; Determine the casing magnetic field value B of the adjacent drilled casing G ; B G =B T -B Among them, B T is the magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field; B is the magnetic induction intensity at the location of the drilling; According to the three-axis gravity acceleration intensity generated by the gravity field and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, the azimuth angle θ from the center of the circle of the wellbore being drilled to the center of the wellbore being drilled is determined; Among them, B TX , B TY , B TZ are the components of the static magnetic field of the adjacent well casing in the three axial directions of X, Y, and Z under the influence of the geomagnetic field; G X , G Y are the components of the gravity field in the X and Y axial directions respectively; Determine the spatial well spacing R between the drilled wells and the wells being drilled; B G =(1-μ0)Rcosθ+(1-μ0)Rsinθ+12(1+μ0)Rsin2θ Among them, B G is the casing magnetic field value of the adjacent drilled casing; θ is the azimuth from the center of the circle of the drilling wellbore to the center of the drilled wellbore; μ0 is the correction coefficient of the drilling casing magnetic interference corresponding to the azimuth and distance.

2. The passive magnetic ranging anti-collision method according to claim 1, characterized in that: Determine the drilled wells adjacent to the drilling well, analyze and obtain the well sections that need anti-collision treatment in the drilling well, and obtain the corresponding well section information, including: Identify the drilled wells adjacent to the well being drilled; Taking the coordinates of the wellhead of the drilled well as the reference, determine the coordinate relationship between the drilled well and the well being drilled; Set the acquisition interval, and obtain the adjacent well separation coefficients at different measuring points in the wellbore trajectory being drilled according to the acquisition interval; Determine whether the separation coefficient of adjacent wells is greater than the threshold value; In response to this, the corresponding well section is determined as the well section that needs to be processed for anti-collision, and the well section information of the well section is obtained.

3. The passive magnetic ranging anti-collision method according to claim 2, characterized in that: The acquisition interval is the drilling distance interval, and the adjacent well separation coefficient at each measuring point position in the wellbore trajectory being drilled is obtained according to the drilling distance interval.

4. A passive magnetic ranging and anti-collision device using the method as claimed in any one of claims 1 to 3, characterized in that: Including ground control system and downhole detection assembly; The ground control system determines the drilled wells adjacent to the well being drilled, analyzes and obtains the well sections of the well being drilled that need anti-collision treatment, and obtains the corresponding well section information, wherein the well section information includes: well depth, scanning radius and scanning angle; controls the downhole detection assembly to obtain data in each well section, and receives the spatial well spacing R between the drilled well and the well being drilled; The downhole detection assembly obtains the magnetic induction intensity at the location of the drilling well, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field when drilling to the well section that needs anti-collision treatment; and determines the spatial well spacing R between the drilled well and the drilling well by using the magnetic induction intensity at the location of the drilling well, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, including: According to the triaxial magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, the magnetic induction intensity B of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field is determined. T ; Among them, B TX , B TY , B TZ They are the components of the static magnetic field of the adjacent well casing in the three axial directions of X, Y and Z under the influence of the geomagnetic field; Determine the casing magnetic field value B of the adjacent drilled casing G ; B G =B T -B Among them, B T is the magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field; B is the magnetic induction intensity at the location of the drilling; According to the three-axis gravity acceleration intensity generated by the gravity field and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, the azimuth angle θ from the center of the circle of the wellbore being drilled to the center of the wellbore being drilled is determined; Among them, B TX , B TY , B TZ are the components of the static magnetic field of the adjacent well casing in the three axial directions of X, Y, and Z under the influence of the geomagnetic field; G X , G Y are the components of the gravity field in the X and Y axial directions respectively; Determine the spatial well spacing R between the drilled wells and the wells being drilled; B G =(1-μ0)Rcosθ+(1-μ0)Rsinθ+12(1+μ0)Rsin2θ Among them, B G is the casing magnetic field value of the adjacent drilled casing; θ is the azimuth from the center of the circle of the drilling wellbore to the center of the drilled wellbore; μ0 is the correction coefficient of the drilling casing magnetic interference corresponding to the azimuth and distance.

5. The passive magnetic ranging anti-collision device according to claim 4, characterized in that: The downhole detection assembly includes a high-precision downhole measurement probe, an MWD signal transmission unit and a high-power mud turbine generator; High-precision downhole measurement probe, when drilling to the well section that needs anti-collision treatment, obtains the magnetic induction intensity of the drilling location, the three-axis gravity acceleration intensity generated by the gravity field, and the three-axis magnetic induction intensity of the static magnetic field of the adjacent drilled casing under the influence of the geomagnetic field; The spatial well spacing R between the drilled well and the drilling well is determined by using the magnetic induction intensity at the drilling location, the triaxial gravity acceleration intensity generated by the gravity field, and the triaxial magnetic induction intensity of the static magnetic field of the adjacent drilled well casing under the influence of the geomagnetic field, including: According to the triaxial magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, the magnetic induction intensity B of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field is determined. T ; Among them, B TX , B TY , B TZ They are the components of the static magnetic field of the adjacent well casing in the three axial directions of X, Y and Z under the influence of the geomagnetic field; Determine the casing magnetic field value B of the adjacent drilled casing G ; B G =B T -B Among them, B T is the magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field; B is the magnetic induction intensity at the location of the drilling; According to the three-axis gravity acceleration intensity generated by the gravity field and the three-axis magnetic induction intensity of the static magnetic field of the adjacent well casing under the influence of the geomagnetic field, the azimuth angle θ from the center of the circle of the wellbore being drilled to the center of the wellbore being drilled is determined; Among them, B TX , B TY , B TZ are the components of the static magnetic field of the adjacent well casing in the three axial directions of X, Y, and Z under the influence of the geomagnetic field; G X , G Y are the components of the gravity field in the X and Y axial directions respectively; Determine the spatial well spacing R between the drilled wells and the wells being drilled; B G =(1-μ0)Rcosθ+(1-μ0)Rsinθ+12(1+μ0)Rsin2θ Among them, B G is the casing magnetic field value of the adjacent drilled casing; θ is the azimuth angle from the center of the circle of the drilling wellbore to the center of the drilled wellbore; μ0 is the correction coefficient of the drilling casing magnetic interference corresponding to the azimuth and distance; The MWD signal transmission unit transmits the received spatial well spacing R between the drilled well and the drilling well, and converts the AC power output by the high-power mud turbine generator into DC power to power the high-precision downhole measurement probe; The high-power mud turbine generator supplies power to the high-precision downhole measurement probe through the MWD signal transmission unit.

6. The passive magnetic ranging and anti-collision device according to claim 5, characterized in that: The high-precision downhole measurement probe includes a high-antimagnetic beryllium bronze protective shell with closed ends. A pressure sensor, a temperature sensor, a microcontroller module, a power module, a high-precision three-axis fluxgate sensor and a high-precision three-axis acceleration sensor are arranged in the high-antimagnetic beryllium bronze protective shell. The pressure sensor, the temperature sensor, the power module, the high-precision three-axis fluxgate sensor and the high-precision three-axis acceleration sensor are all connected to the microcontroller module.

7. The passive magnetic ranging and anti-collision device according to claim 5 or 6, characterized in that: The MWD signal transmission unit includes a microcontroller module, an AC / DC conversion module and a pulse generator. The high-precision downhole measurement probe is connected to the microcontroller module and the AC / DC conversion module respectively. The microcontroller module is connected to the pulse generator and the AC / DC conversion module respectively.

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