CN105649613A - Reverse magnetic moment compensation magnetic field while-drilling rotating ranging device and ranging anti-collision method - Google Patents
Reverse magnetic moment compensation magnetic field while-drilling rotating ranging device and ranging anti-collision method Download PDFInfo
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- CN105649613A CN105649613A CN201610009640.8A CN201610009640A CN105649613A CN 105649613 A CN105649613 A CN 105649613A CN 201610009640 A CN201610009640 A CN 201610009640A CN 105649613 A CN105649613 A CN 105649613A
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- magnetic field
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- drilling
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/09—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
- E21B47/092—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes by detecting magnetic anomalies
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
Abstract
The invention discloses a reverse magnetic moment compensation magnetic field while-drilling rotating ranging device which comprises a permanent magnet set, a reverse compensation electromagnet and a magnetic field measuring sensor, and the permanent magnet set is installed between a drill bit and a non-magnetic drill collar. The invention further discloses a reverse magnetic moment compensation magnetic field while-drilling rotating ranging anti-collision method. According to the reverse magnetic moment compensation magnetic field while-drilling rotating ranging anti-collision method, after permanent magnets are offset with the measuring points of the magnetic field sensor, a vertical magnetic field of a rotating shaft is made not to be higher than 0.1 nT by adjusting an electric current of the reverse compensation electromagnet; the distance between the drill bit for a drilling well and a sleeve for a drilled well is estimated by measuring the peak-to-peak value of the vertical magnetic field, so that the drilling process of the drilling well is controlled in real time, and while-drilling collision prevention of a cluster well is achieved. According to the reverse magnetic moment compensation magnetic field while-drilling rotating ranging device, the distance between the drilling well and an adjacent well can be measured in real time during drilling, drilling does not need to be stopped, other guiding devices also do not need to be introduced into the other well, and operation of the drilled well is not affected; meanwhile, magnetic measuring point close-range reverse magnetic moment compensation is adopted by the method, the size of a rotating magnetic field can be effectively enhanced, and the ranging precision of the magnetic field is improved.
Description
Technical field
The invention belongs to cluster wells drilling technique field, particularly relate to a kind of anti-magnetic moment and compensate magnetizing field with brill rotation range unit and range finding anti-collision method.
Background technology
In cluster wells drilling process, due to various influence factors such as the hole deviation error of the hole deviation error of marine riser, straight well section, apparatus measures error and human factors, cause positive wellbore trace can not creep in strict accordance with desired trajectory, positive drilling well is caused to happen occasionally with the accident of the collision of wellbore trace, cause oil gas well to stop production, scrap and produce tremendous economic loss, deal with improperly and also may produce Heavy environmental pollution and workmen's injures and deaths. Therefore, solve well anti-collision problem, have important practical significance in cluster wells drilling process.
The method of prevention well collision has two big classes, and first kind method accurately controls well track, and well track is crept in strict accordance with the track of collision that can not cause designed in advance; 2nd class method is distance between the positive drilling well of implementing monitoring and offset well in drilling process so that positive drilling well is crept in anti-collision safety distance. First kind method is by improving the precision of well track survey calculation instrument, realize to reduce well track error, but this kind of method just bore before prophylactic function, distance between the positive drilling well of Real-Time Monitoring and offset well when cannot accomplish to bore, therefore cannot avoid well to collide root. 2nd class method can distance between the positive drilling well of Real-Time Monitoring and offset well, make this distance keep a value that reasonably can not cause collision always, such method can solve the problem of well collision protection root, is the main direction of studying that cluster wells anti-collision creeps into.
At present, drilling well range finding anti-collision monitoring method technology mainly contains vibration monitoring method, single cable guide system (SingleWireGuidance, SWG), rotatingfield ranging system ((RotatingMagnetRangingService, RMRS) and electro-magnet anti-collision real time distance system etc. Vibration monitoring method be a kind of can the method for early warning of collision free, mainly contain sleeve pipe vibration monitoring method with brill vibration monitoring method. Sleeve pipe vibration monitoring method is by detection ground well casing head vibration signal, and processes signal to judge whether positive drilling well arrives Risk of Collision scope, and owing to vibration transmission affects by casing length and cementing quality, this method for early warning accuracy is not high enough. It is enter sonic sensor boring under in recovery well with brill vibration monitoring method, the approximate distance judged between positive drilling bit and sensor by monitoring vibration energy change carries out anti-collision early warning, need when this anti-collision method is applied and positive drilling bit synchronizing moving just can accurately judge drill bit and shortest distance between drilling well, drill bit and drilling rod and well bore collision produce vibrations and bit vibration also can be disturbed to monitor, simultaneously vibration transmission decay speed is by formation influence, and therefore shaft bottom vibration monitoring method early warning range is little and accuracy is not high enough.
SWG System Working Principle be in drilling well under enter a cable and lead to into a constant electric current, make the surrounding of cable can produce a fixing magnetic field, by the magnetic field measuring unit in MWD near positive drilling bit, the magnetic field that cable produces is measured, send data to the distance and bearing determining drilling well relative to positive drilling well through calculating in ground by mud. The shortcoming of this kind of instrument must enter cable boring under in offset well, can affect the normal production of recovery well like this, and need to employ a large amount of instrument equipment to complete this work. RMRS system is mainly used in steam assisted gravity to let out in oil and inject well and be parallel to, with boring to instruct, the auxiliary means that recovery well creeps into, and this system also can be applied to the positive drilling well anti-collision of cluster wells and creeps into simultaneously. Although this instrument is higher from accuracy in control in parallel well spacing, but for also needing during positive drilling well anti-collision, this system is improved, guiding owing to needing to enter inserting tube under in drilling well when anti-collision is monitored, therefore anti-collision monitoring amount is big, it may also be useful to inconvenient simultaneously. Electro-magnet anti-collision real time distance system uses two magnetic moment sizes equal, the contrary electro-magnet in direction is about fluxgate sensor measuring point reversed arrangement, real-time rotary magnetization measuring period field for calculating positive drilling well and distance between drilling well, for cluster wells with brill range finding anti-collision. The method experiment test effect is better, but the non-magnetic drill collar tool length that the validity being played this instrument then requires to be installed on drill bit rear end must reach more than 1.2m, and this will certainly affect the guide function of drilling well. Meanwhile, this instrument requirement big current is powered and is required that very high coil turn produces bigger magnetic field, and its practical application has some difficulty.
Summary of the invention
The present invention is directed to current cluster wells drilling well range finding and the deficiency of anti-collision monitoring method existence, propose a kind of anti-magnetic moment and compensate magnetizing field with brill rotation range unit and range finding anti-collision method, this device can measure the distance between positive drilling well and offset well in real time with boring, do not need to stop to bore, do not need to enter other guiding devices under in another mouthful of well, do not affect the operation of drilling well yet. Meanwhile, the method adopts the closely anti-magnetic moment compensation of magnetic survey point, it is possible to effectively strengthen rotary magnetization field size, it is to increase magnetic field range finding validity; This magnetic distance mearuring equipment is shorter, it is possible to greatly reduces or disappears and locates instrument tool to the impact of drilling guidance; And this instrument adopts the ferromagnetic source of permanent magnetism, instruments design makes and works convenient.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
The present invention discloses a kind of anti-magnetic moment and compensates magnetizing field with brill rotation range unit, comprising permanent magnet group, Contrary compensation electro-magnet and magnetic field survey sensor, described permanent magnet group, described Contrary compensation electro-magnet and described magnetic field survey sensor become a straight line to be arranged between drill bit and non-magnetic drill collar.
Further, described permanent magnet group comprises the cylindrical permanent magnets that multiple surfaces magnetic induction density is about the equivalent magnetic moment cocurrent and parallel arrangement of 1.5T (or higher).
Further, the equivalent magnetic moment of described Contrary compensation electro-magnet is contrary with described cylindrical permanent magnets equivalence magnetic moment direction.
Further, described magnetic field survey sensor is uniaxial magnetic field sensor, its magnetic field measuring point is positioned on the axis of this rotation range unit, magnetic field direction of measurement and described axes normal, makes the vertical magnetic field of measuring point, turning axle place be less than 0.1nT by adjusting described Contrary compensation electromagnet current.
The invention also discloses a kind of anti-magnetic moment and compensate magnetizing field with brill rotation range finding anti-collision method, the method comprises the following steps:
Step one, permanent magnet group, Contrary compensation electro-magnet and magnetic field survey sensor are fixedly mounted on one, and without forming in magnetic metal short circuit, anti-magnetic moment compensates magnetizing field with brill rotation range unit, is arranged between non-magnetic drill collar and drill bit without magnetic short circuit range unit;
Step 2, without magnetic short circuit range unit along with drilling rod rotates together, do not exist around positive drilling well well casing time, magnetic field sensing device measure the vertical magnetizing field cycle fluctuate close to 0nT; Exist within the scope of anti-collision around positive drilling well well casing time, magnetic field sensing device measures the fluctuation of periodic magnetizing field, and fluctuation peak peak value size meets formula (1) funtcional relationship:
Bpp=f (ma1,ma2,��,maN,��a,��,��,D)(1)
M in formula (1)a1,ma2,��,maNFor the equivalent magnetic moment of permanent magnet each permanent magnet of group, ��aFor boring the effective susceptibility of offset well sleeve pipe, �� is the external diameter of sleeve pipe, and �� is the thickness of sleeve pipe, these parameters carry out magnetic field range finding anti-collision pre-test obtain, be known variables, namely formula (1) can be changed into rotate peak, vertical magnetic field peak value BppOne-variable function about positive drilling well magnetic survey point offset well distance D:
Bpp=f (D) (2)
Step 3, sets up anti-magnetic moment by MDR and compensates magnetizing field with brill rotation computation model, obtain vertical magnetic field magnetic B in formula (1) known parameters and measurementppWhen, use particle swarm optimization algorithm and anti-magnetic moment to compensate magnetizing field and rotate computation model with brill, find and make to calculate peak, the vertical magnetic field peak value distance D as far as possible little with measuring peak, vertical magnetic field peak value difference, adjust positive drilling well to creep in real time and make positive drilling bit remain within the scope of safety drilling, with realize between positive drilling well and offset well with brill anti-collision.
The useful effect of the present invention:
This kind of anti-magnetic moment provided by the invention compensates magnetizing field can with boring the real-time distance measured between positive drilling well and offset well with boring rotation range unit, it is not necessary to stops boring, does not also need to enter other guiding devices under in another mouthful of well, do not affect the operation of drilling well. Meanwhile, this kind of anti-magnetic moment compensation magnetizing field rotates range finding anti-collision method employing magnetic survey point closely anti-magnetic moment compensation with brill, it is possible to effectively strengthen rotary magnetization field size, it is to increase magnetic field range finding validity; This magnetic distance mearuring equipment is shorter, it is possible to effectively reduces or disappears and locates instrument tool to the impact of drilling guidance; And this instrument adopts the ferromagnetic source of permanent magnetism, instruments design makes and works convenient.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is that the anti-magnetic moment of the present invention compensates magnetizing field with brill rotation range unit structure diagrammatic cross-section;
In figure: 1, permanent magnet group; 2, Contrary compensation electro-magnet; 3, magnetic field survey sensor.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only the present invention's part embodiment, instead of whole embodiments. Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
It is illustrated in figure 1 a kind of embodiment of the present invention, a kind of anti-magnetic moment compensates magnetizing field and rotates range unit with brill, comprising permanent magnet group 1, Contrary compensation electro-magnet 2 and magnetic field survey sensor 3 is arranged on without in magnetic metal short circuit, described permanent magnet group 1, described Contrary compensation electro-magnet 2 and described magnetic field survey sensor 3 one-tenth straight lines, anti-collision is arranged between drill bit and non-magnetic drill collar without magnetic metal short circuit. Described permanent magnet group 1 comprises the square cylindrical permanent magnets that eight surperficial magnetic induction density are about the arrangement of magnetic moment in the same way of 1.5T.
Rotation anti-collision range finding step is with boring to utilize this range unit to carry out anti-magnetic moment compensation magnetizing field:
Step one, permanent magnet group, Contrary compensation electro-magnet and magnetic field survey sensor are fixedly mounted on one, and without forming in the fixing short circuit of magnetic metal, anti-magnetic moment compensates magnetizing field with brill rotation range unit; Eight length of sides are 3.5cm, and the square cylindrical permanent magnets that length is 12cm divides two rows arranged in parallel, and equivalence magnetic moment direction is with without magnetic short circuit axes normal, permanent magnet group is centrally located on short circuit axis; Magnetic field is surveyed sensor and is adopted uniaxial magnetic open gate sensor, and precision is 0.1nT, is perpendicular to without the installation of magnetic short circuit axis, and sensor measuring point is positioned on short circuit axis distance permanent magnet group center 0.4m; Compensation electromagnetic cylindrical iron body iron core length is 5cm, and radius is 1cm, and cylinder axis is perpendicular to short circuit axis, and center is upper between sensor measuring point and permanent magnet group center at short circuit axis, and distance measuring point 5cm. By adjustment electromagnet current in magnetic shielding environment so that after measuring point place magnetic field cancellation, sensor measures magnetic field not higher than 0.1nT. Fix permanent magnet group now, magnetic field sensing device and compensation electromagnetic iron. Constant current source stable electrical magnet is adopted to power electric current.
Step 2, is arranged between non-magnetic drill collar with drill bit together with drilling rod without magnetic short circuit range unit and rotates, do not exist around positive drilling well well casing time, magnetic field sensing device is measured the vertical magnetizing field cycle and is fluctuated close to 0nT; Exist within the scope of anti-collision around positive drilling well well casing time, magnetic field sensing device measure periodic magnetizing field fluctuation, magnetic fluctuation peak peak value size meets formula (1) funtcional relationship:
Bpp=f (ma1,ma2,��,maN,��m,��,��,D)(1)
M in formula (1)a1,ma2,��,maNFor the equivalent magnetic moment of permanent magnet each permanent magnet of group, ��mFor boring the material susceptibility of offset well sleeve pipe, �� is the external diameter of sleeve pipe, and �� is the thickness of sleeve pipe, these parameters carry out magnetic field range finding anti-collision pre-test obtain, be known variables, namely formula (1) can be changed into rotate peak, vertical magnetic field peak value BppAbout the one-variable function of positive drilling well magnetic survey point to offset well distance D:
Bpp=f (D) (2)
Set up anti-magnetic moment by MDR and compensate magnetizing field with brill rotation computation model, measurement obtains sleeve parameters, under the prerequisite of near surface testing well known distance D, by revising demagnetizing factor, set up anti-magnetic moment compensation magnetizing field and with anti-collision distance D in brill rotation computation model and rotate peak, vertical magnetic field peak value BppBetween accurate calculated relationship.
Step 3, to be arranged between non-magnetic drill collar with drill bit with positive drilling bit without magnetic short circuit range unit to creep into, down-hole magnetic field measuring device often revolves to turn around at drilling rod and gathers 360 data, every 1��10 circle (other magnetic field sampled value being greater than 1 circle is also suitable for, and 6 circles are better) calculates and once rotates peak, vertical magnetic field peak value BppMean value. In drilling course, rotate peak, vertical magnetic field peak value BppMean value real-time Transmission to ground computer, step 2 set up anti-collision distance D with rotation peak, vertical magnetic field peak value BppBetween accurately calculated relationship when, it may also be useful to particle swarm optimization algorithm finds and makes to calculate vertical magnetic field peak peak value and peak, measurement while drilling vertical magnetic field peak value mean difference and try one's best little distance D', the distance that this distance D' is between measuring point to offset well. Adjust positive drilling well to creep in real time and make positive drilling bit remain within the scope of safety drilling, with realize between positive drilling well and offset well with brill anti-collision.
This kind of anti-magnetic moment provided by the invention compensates magnetizing field can with boring the real-time distance measured between positive drilling well and offset well with boring rotation range unit, it is not necessary to stops boring, does not also need to enter other guiding devices under in another mouthful of well, do not affect the operation of drilling well. Meanwhile, this kind of anti-magnetic moment compensation magnetizing field rotates range finding anti-collision method employing magnetic survey point closely anti-magnetic moment compensation with brill, it is possible to effectively strengthen rotary magnetization field size, it is to increase magnetic field range finding validity; This magnetic distance mearuring equipment is shorter, it is possible to effectively reduces or disappears and locates instrument tool to the impact of drilling guidance; And this instrument adopts the ferromagnetic source of permanent magnetism, instruments design makes and works convenient.
The foregoing is only the better embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. an anti-magnetic moment compensates magnetizing field with brill rotation range unit, it is characterized in that, comprising permanent magnet group, Contrary compensation electro-magnet and magnetic field survey sensor, described permanent magnet group, described Contrary compensation electro-magnet and described magnetic field survey sensor become a straight line to be arranged between drill bit and non-magnetic drill collar.
2. the anti-magnetic moment of one according to claim 1 compensates magnetizing field with brill rotation range unit, it is characterised in that, described permanent magnet group comprises the cylindrical permanent magnets that multiple surfaces magnetic induction density is about the equivalent magnetic moment cocurrent and parallel arrangement of 1.5T.
3. the anti-magnetic moment of one according to claim 2 compensates magnetizing field with brill rotation range unit, it is characterised in that, the equivalent magnetic moment of described Contrary compensation electro-magnet is contrary with described cylindrical permanent magnets equivalence magnetic moment direction.
4. the anti-magnetic moment of one according to claim 1 compensates magnetizing field with brill rotation range unit, it is characterized in that, described magnetic field survey sensor is uniaxial magnetic field sensor, its magnetic field measuring point is positioned on the axis of this rotation range unit, magnetic field direction of measurement and described axes normal, make vertical magnetic field, measuring point turning axle place be less than 0.1nT by adjusting described Contrary compensation electromagnet current.
5. an anti-magnetic moment compensates magnetizing field with brill rotation range finding anti-collision method, it is characterised in that, comprise the following steps:
Step one, permanent magnet group, Contrary compensation electro-magnet and magnetic field survey sensor are fixedly mounted on one, and without forming in magnetic metal short circuit, anti-magnetic moment compensates magnetizing field with brill rotation range unit, is arranged between non-magnetic drill collar and drill bit without magnetic short circuit range unit;
Step 2, without magnetic short circuit range unit along with drilling rod rotates together, do not exist around positive drilling well well casing time, magnetic field sensing device measure the vertical magnetizing field cycle fluctuate close to 0nT; Exist within the scope of anti-collision around positive drilling well well casing time, magnetic field sensing device measures the fluctuation of periodic magnetizing field, and the size of fluctuation peak peak value meets formula (1) funtcional relationship:
Bpp=f (ma1,ma2,��,maN,��a, ��, ��, D) and (1)
M in formula (1)a1,ma2,��,maNFor the equivalent magnetic moment of permanent magnet each permanent magnet of group, ��aFor boring the effective susceptibility of offset well sleeve pipe, �� is the external diameter of sleeve pipe, and �� is the thickness of sleeve pipe, these parameters carry out magnetic field range finding anti-collision pre-test obtain, be known variables, namely formula (1) can be changed into rotate peak, vertical magnetic field peak value BppAbout the one-variable function of positive drilling well magnetic survey point to offset well distance D:
Bpp=f (D) (2)
Step 3, sets up anti-magnetic moment by magneto-dipole structured approach and compensates magnetizing field with brill rotation computation model, obtain peak, vertical magnetic field peak value B in formula (1) known parameters and measurementppWhen, use particle swarm optimization algorithm and anti-magnetic moment to compensate magnetizing field and rotate computation model with brill, find and make to calculate peak, the vertical magnetic field peak value distance D as far as possible little with measuring peak, vertical magnetic field peak value difference, adjust positive drilling well to creep in real time and make positive drilling bit remain within the scope of safety drilling, with realize between positive drilling well and offset well with brill anti-collision.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111188614A (en) * | 2020-01-09 | 2020-05-22 | 西南石油大学 | Petroleum drilling anti-collision passive detection device and method based on magnetic core coil |
| CN113107472A (en) * | 2021-05-11 | 2021-07-13 | 京鸿石油钻采工程技术有限公司 | Active magnetic distance measuring device and method suitable for well drilling collision prevention |
| CN113669051A (en) * | 2021-08-30 | 2021-11-19 | 中国地质科学院勘探技术研究所 | Magnetic joint for magnetic positioning, magnetic positioning system and magnetic positioning method |
| CN111188614B (en) * | 2020-01-09 | 2024-04-19 | 西南石油大学 | Petroleum drilling anti-collision passive detection device and method based on magnetic core coil |
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Application publication date: 20160608 |