CN104215934A - Method for performing hydraulic-fracturing microseismic monitoring by utilizing uphole geophones - Google Patents
Method for performing hydraulic-fracturing microseismic monitoring by utilizing uphole geophones Download PDFInfo
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- CN104215934A CN104215934A CN201310219803.1A CN201310219803A CN104215934A CN 104215934 A CN104215934 A CN 104215934A CN 201310219803 A CN201310219803 A CN 201310219803A CN 104215934 A CN104215934 A CN 104215934A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/18—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic, or infrasonic waves
- G01S5/28—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic, or infrasonic waves by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
- G01V1/20—Arrangements of receiving elements, e.g. geophone pattern
Abstract
The invention relates to a method for performing hydraulic-fracturing microseismic monitoring by utilizing uphole geophones and applying geophysical prospecting. The geophones are mounted on hydraulic-fracturing uphole casings, micro-seismic signals generated by underground rock under the high-pressure hydraulic action during fracturing are recorded, and micro-seismic signal waves are transmitted to the casings along the horizontal direction to be converted into sound waves which are transmitted along the steel casings to be recorded by the uphole geophones. By the method, geometric position coordinates of underground rock failure points can be determined rapidly and accurately on a fracturing construction site, and the method and device simple in construction can be applied to dynamic imaging and rapid post-fracturing assessment of hydraulically created fractures of low permeability reservoirs and shale reservoirs of oil fields.
Description
Relate to field
The present invention relates to applied geophysics method of exploration technology, is a kind ofly utilize more than three mouthfuls or three mouthfuls well head three-component seismometers to carry out the method for waterfrac treatment micro-seismic monitoring.
Background technology
Microseismic is the new technology for the oil-gas field development stage occurred in recent years, is by observation, analyzes in activity in production the geophysical techniques that the small seismic events produced monitors the impact of activity in production, effect and underground state.Basic practice is: by well or ground configuration geophone arrangement receive the small seismic events that oil and gas producing activities produced or induced; And by asking for the parameters such as micro-seismic event source location to the inverting of these events; Finally, by these parameters activity in production monitored or instruct.
Current the method is mainly used in crack dynamic imaging and the pressure later evaluation of oil field low permeability reservoir and shale reservoir hydrfracturing, and the dynamic monitoring of oilfield development process, and mainly fluid drives monitoring.
Micro-seismic monitoring is divided in ground monitoring and well monitors two kinds of modes.Ground monitoring is exactly on the ground around monitoring objective region (such as fractured well), arranges hundreds of or thousands of ground simple components or three-component seismometer and records the microearthquake signal that produces when subsurface rock breaks to carry out micro-seismic monitoring.Monitor in well in the well of a bite or several mouthfuls of wells closed on around monitoring objective region exactly and arrange that three-component seismometer receives arrangement, carry out micro-seismic monitoring.Because stratum is to the reason such as the absorption of microearthquake signal energy, travel path be complicated; Compared with monitoring with well, current ground micro-seismic monitors that the data obtained exists that microseismic event is few, signal to noise ratio (S/N ratio) is low, inverting poor reliability and the shortcoming such as production cost is high.
In grand celebration oil geology and exploitation (the 25th volume the 3rd phase, 2006) in " by microearthquake wave method determination Song-liao basin Toutai Oilfield stress field feature " literary composition, Liu Yunbin etc. openly know clearly and determine the method for oil field stress field feature by microearthquake wave method, and disclose a kind of microseism Fracturing Monitoring system: this system is near fractured well, to select on 3 mouthfuls of well cloth wave detector as monitor well.During pressure break, the formation rock microearthquake wave produced that breaks is detected device and receives and convert voltage signal to, sends into AE-400B microearthquake wave positioning system and carries out time difference generating process, then send into computer acquisition process, generation t after enlarge leadingly
1, t
2two groups of time differences.For trying to achieve the position of vibrations source point, if first receive the oil well S of vibration signal
0be positioned at true origin, and take due east as x-axis, positive north sets up rectangular coordinate system, the another two mouthfuls of monitor well S of arranged clockwise for y-axis
1and S
2, its coordinate is respectively (x
1, y
1), (x
2, y
2).When microearthquake signal is by S
0when well wave detector receives, if vibrations source point is to S
0well spacing from being r, then shakes source point to S
1well spacing is from being r+ δ 1 (δ 1=Vt
1), arrive S
2well spacing is from being r+ δ
2(δ
2=Vt
2).Wherein, t
1, t
2for microearthquake wave arrives monitor well S from vibrations source point
1, S
2travel-time difference (with S
0relatively).If signal each monitor well vertical walk time identical, then shake asking for of source point become a plane problem.With S
0for on the coordinate system of initial point, respectively with S
0, S
1, S
2for the center of circle, with r, r+ δ
1, r+ δ
2for radius is justified, the intersection point of 3 circles is vibrations source point, and the equation of 3 circles is:
x
2+
y 2=r
2 (3)
(x-x
1)
2+(y-y
1)
2=(r+δ
1)
2=(r+V·t
1)
2 (4)
(x-x
2)
2+(y-y
2)
2=(r+δ
2)
2=(r+V·t
2)
2 (5)
In formula: velocity of wave in V-stratum; t
1, t
2-two groups of time differences recording.
Three formula listed by said method cannot determine the projection of vibrations source point on ground, because have 4 unknown numbers, i.e. x, y, δ in three formula
1and δ
1, 4 unknown numbers cannot be solved with three equations.In addition, the V used in formula is seismic event velocity of propagation in the earth formation, and this system can not determine the geometric position in the space that rock burst point is concrete in underground.
Current Foreign Well Logging Technology (the 25th volume the 3rd phase, 2006) " waterfrac treatment monitoring new method ", Kevin Tanner discloses a kind of waterfrac treatment monitoring method.The method discloses the VSI instrument that Schlumberger uses, and employs three axles (X, Y and Z) accelerometer wave detector.Accelerometer wave detector realizes isolating with the acoustics of whole apparatus subject by spacer spring, can gather geological data in Hi-Fi well.VSI instrument realizes the mechanical couplings with sleeve pipe or stratum by a powerful anchor arm.
The method principal feature is that the acoustics realizing accelerometer wave detector and whole apparatus subject by spacer spring is isolated, in order to reduce or the interference of microseismic signals and impact in stratum that decay apparatus subject bulk wave (tool body wave) is recorded to accelerometer wave detector, improve the sensitivity of VSI instrument.When microearthquake signal in stratum arrives monitor well sleeve pipe, the accelerometer wave detector having carried out acoustics isolation (utilizing spacer spring) with whole apparatus subject detects microseismic signals more sensitively by than the accelerometer wave detector not carrying out acoustics isolation.
This device degree of will speed up meter wave detector is installed in an apparatus subject, for avoiding apparatus subject bulk wave (the tool body wave) interference to accelerometer wave detector, needs itself and apparatus subject spacer spring to carry out acoustics isolation.Installation will by a powerful anchor arm realize accelerometer wave detector in sleeve pipe with the mechanical couplings on sleeve pipe or stratum, complex structure, constructs loaded down with trivial details.
Utilize down-hole three-component accelerometer detector array/arrangement disclosed in " waterfrac treatment monitoring new method ", this kind of three-component accelerometer wave detector from use different sensors in the present invention.Using three-component analog or digital wave detector in the present invention, is not accelerometer wave detector.Three-component analog or digital wave detector not to be installed in an apparatus subject due to the present invention and to transfer to down-hole, not needing itself and apparatus subject spacer spring to carry out acoustics isolation yet.In addition, the mounting means of three-component analog or digital wave detector is also different from disclosed in document, do not need by a powerful anchor arm realize three-component analog or digital wave detector in sleeve pipe with the mechanical couplings on sleeve pipe or stratum, but with a simple snap ring, three-component analog or digital wave detector to be firmly fixed on outside the casinghead of well head.Being utilize three-component accelerometer detector array/be arranged in recorded downhole microseismic signals disclosed in " waterfrac treatment monitoring new method ", is not in well head record microseismic signals.What it recorded is the microseismic signals directly propagating into down-hole three-component accelerometer wave detector from rock burst point along stratum, and this microseismic signals does not propagate into ground along steel sleeve.The method is located by the microseismic signals of the three-component accelerometer detector array record of down-hole homeotropic alignment, because the geometric shape of this recording geometry is morbid state relative to the inverting of Earthquake source location, the position of the Earthquake source point namely gone out with its data inversion is not unique.And above-mentioned waterfrac treatment monitoring new method can't resolve unique orientation problem of microseismic event, it needs the known conditions with other (as fractured well detects the orientation of well relatively) to retrain the position of the Earthquake source point be finally inversed by obtain reliable result.
Summary of the invention
Be to provide that a kind of signal to noise ratio (S/N ratio) is high, good reliability, the well head three-component seismometer that utilizes that can carry out accurately location with the breakdown point (1) produced when waterfrac treatment subsurface rock carries out the method for waterfrac treatment micro-seismic monitoring order of the present invention.
The present invention is realized by following steps:
1) around fractured well, select arbitrarily the ground monitoring well (2,3,4) of more than three mouthfuls or three mouthfuls, every mouthful of monitor well wellhead casing pipe is installed a three-component seismometer (5,6,7) respectively;
Described installation is fixed on outside the casinghead of well head with the circumferential clasp of band fastening bolt by three-component analog or digital wave detector;
Described wave detector is three-component analog or digital wave detector (5,6,7);
2) well head installs the microearthquake signal (1) produced when three-component analog or digital wave detector Real-time Collection record subsurface rock breaks under high-pressure hydraulic effect;
Described acquisition and recording records microearthquake signal (1) by vehicle-mounted or ground multichannel seismic data acquisition system (8).
Described microearthquake signal (1) be from rock burst point horizontally layer propagate into monitor well 2,3,4 with shortest path (X1, X2, X3), then convert the compressional wave and shear wave signal upwards propagated along steel sleeve to; 3) speed propagated in steel sleeve according to known sound wave and known sound wave are at the travel-time difference value Δ t of the compressional wave be recorded to respectively by the velocity of propagation (obtaining from log data) in fracturing stratum and three well heads and shear wave
1, Δ t
2, Δ t
3, the microearthquake signal (1) calculated propagates into the distance (X1, X2, X3) on monitor well sleeve pipe along horizontal direction;
Thus the annular trace of the corresponding every mouthful of monitor well of possible rock burst point (microearthquake source location) at floor projection can be obtained;
The annular trace of described floor projection be respectively with monitor well (2,3,4) for the center of circle, respectively with three projections of circle on ground directly propagating into distance X1 on monitor well sleeve pipe in the horizontal direction, X2, X3 are radius.
4) the vertical buried depth (H) of knick point and known compressional wave and the velocity of propagation of shear wave in Steel Casing is defeated according to known water, compressional wave and shear wave from rock burst point to the velocity of propagation (obtaining by according to sound wave measuring well curve) in the stratum of monitor well, the compressional wave be recorded to respectively at each well head and the travel-time difference value Δ t of shear wave
1, Δ t
2, Δ t
3, coordinate in length and breadth (X, the Y) parameter of the subpoint of point on ground that Distance geometry three annulus calculating X1, X2 and X3 intersect jointly, descend the position coordinates (X of rock burst point exactly definitely, Y, H) parameter, complete the microseismic event location in the work of waterfrac treatment micro-seismic monitoring.
The travel-time difference that the speed that the present invention utilizes elastic wave to propagate in by fracturing stratum and Steel Casing carries out ripple calculates, the compressional wave of microseismic signals utilizing the rock burst that the well head three-component seismometer of more than three and each three-component seismometer are recorded to produce and the travel-time difference of shear wave, the velocity of longitudinal wave of known fracturing reform reservoir and shear wave velocity, the velocity of longitudinal wave that elastic wave is propagated in Steel Casing and shear wave velocity, known water defeats the vertical buried depth of knick point, just can be used for determining the geometric position of rock burst point in space.
Use three-component analog or digital wave detector in the present invention, do not use accelerometer wave detector.Because three-component analog or digital wave detector is not be installed in an apparatus subject and transfer to down-hole, do not need itself and apparatus subject spacer spring to carry out acoustics isolation yet.In addition, do not need by a powerful anchor arm realize three-component analog or digital wave detector in sleeve pipe with the mechanical couplings on sleeve pipe or stratum, but with the circumferential clasp of a band fastening bolt, three-component analog or digital wave detector to be fixed on outside the casinghead of well head firmly.
The present invention utilizes the three-component analog or digital wave detector that the wellhead casing pipe of more than three mouthfuls or three mouthfuls monitor wells near hydraulically fractured wells is installed, the microearthquake signal that record subsurface rock produces when breaking under high-pressure hydraulic effect, by processing the data be recorded on three-component analog or digital wave detector, the ground monitoring point of more than three or three positioningly can descend the position of rock burst point exactly, the present invention can descend the geometric position coordinate of rock burst point rapidly and accurately definitely at pressing crack construction scene, construction is simple.
Accompanying drawing explanation
Fig. 1 the present invention method schematic diagram of three mouthfuls of wells;
Fig. 2 the present invention data processing method schematic diagram of three mouthfuls of wells;
Fig. 3 the present invention method schematic diagram of four mouthfuls of wells;
Fig. 4 the present invention data processing schematic diagram of four mouthfuls of wells.
Embodiment
The present invention is realized by following concrete implementation step:
1) when utilizing water under high pressure to carry out fracturing reform to low permeability reservoir and shale reservoir, subsurface rock breaks under high-pressure hydraulic effect, and produces microearthquake signal 1;
2) around hydraulically fractured wells, three mouthfuls or three mouthfuls more than monitor wells (2 are selected arbitrarily, 3,4) each installation three-component analog or digital wave detector (5 on wellhead casing pipe, 6,7), with the annular collar of a band fastening bolt, each three-component seismometer can be fixed on outside wellhead casing pipe firmly.Well head installs the microearthquake signal (1) produced when three-component seismometer Real-time Collection record subsurface rock breaks under high-pressure hydraulic effect;
3) the microearthquake signal (1) produced when subsurface rock breaks under high-pressure hydraulic effect is recorded by vehicle-mounted or surface seismic data acquisition system (8), as Fig. 1;
4) it is the shortest path of rock burst point to all monitor wells that the compressional wave that the microearthquake signal (1) described in produces and shear wave energy propagate into monitor well 2,3,4, X1, X2, X3 with shortest path (X1, X2, X3) in the horizontal direction from rock burst point 1;
5) the microearthquake signal (1) propagating into monitor well 2,3,4 is converted to the compressional wave and shear wave signal upwards propagated along steel sleeve with the velocity of propagation of sound wave in steel sleeve in steel sleeve;
6) finally recorded by three-component analog or digital wave detector 5,6,7 of installing each on each wellhead casing pipe and vehicle-mounted or surface seismic data acquisition system 8;
7) according to sound wave measuring well curve, we are known subsurface formations and the required velocity of longitudinal wave (V carrying out the reservoir of fracturing reform
1P) and shear wave velocity (V
1S), the vertical buried depth (H) also knowing waterfrac treatment point and the velocity of longitudinal wave (V propagated in Steel Casing
2P) and shear wave velocity (V
2S);
8) by processing the compressional wave that is recorded on more than three or three three-component analog or digital wave detectors and shear wave data (ask for the travel-time difference value Δ t of compressional wave and shear wave
1, Δ t
2, Δ t
3);
9) speed propagated in steel sleeve according to known sound wave and sound wave are at the travel-time difference value Δ t of the compressional wave be recorded to by the three-component seismometer of the velocity of propagation (known) in fracturing stratum and each well head and shear wave
1, Δ t
2, Δ t
3, calculate microearthquake signal (1) and propagate into distance (X1, X2, X3) on monitor well sleeve pipe along horizontal direction;
The method calculating X1, X2, X3 is as follows:
The travel-time difference value Δ t of the known compressional wave that is recorded at the well head three-component seismometer of three mouthfuls of wells and shear wave
1, Δ t
2, Δ t
3, the velocity of longitudinal wave (V of the reservoir of fracturing reform is obtained according to sound wave measuring well curve
1P) and shear wave velocity (V
1S), and know the velocity of longitudinal wave (V that the vertical buried depth (H) of waterfrac treatment point and elastic wave are propagated in Steel Casing
2P) and shear wave velocity (V
2S), the computing formula of X1, X2, X3 is:
X1=（Δt
1－H（V
2P－V
2S）/V
2PV
2S）（V
1P－V
1S）/V
1PV
1S （1）
X2=（Δt
2－H（V
2P－V
2S）/V
2PV
2S）（V
1P－V
1S）/V
1PV
1S （2）
X3=（Δt
3－H（V
2P－V
2S）/V
2PV
2S）（V
1P－V
1S）/V
1PV
1S （3）
10) thus the annular trace (see figure 2) of the corresponding every mouthful of monitor well of possible rock burst point (microearthquake source location) at floor projection can be obtained; The annular trace of described floor projection be respectively with monitor well 2,3,4 for the center of circle, respectively directly to propagate into three projections of circle on ground that the bee-line on monitor well sleeve pipe is radius in the horizontal direction;
11) (the X of coordinate in length and breadth of the subpoint of point on ground that the vertical buried depth (H) of defeating knick point according to known water and the distance of X1, X2 and X3 calculated and three annulus intersect jointly, Y) parameter, just positioningly can descend the position coordinates (X of rock burst point exactly, Y, H) parameter, completes the work of waterfrac treatment micro-seismic monitoring.Therefore positioningly can descend the geometric position coordinate of rock burst point real-time and accurately with the ground monitoring point of more than three or three, this method and apparatus utilizing well head three-component seismometer to carry out waterfrac treatment micro-seismic monitoring can be applied to the crack dynamic imaging of oil field low permeability reservoir and shale reservoir hydrfracturing and fast ram compression later evaluation.
For the method and apparatus carrying out waterfrac treatment micro-seismic monitoring with more than three mouthfuls well head three-component seismometers, its principle is the same with three mouthfuls of monitor wells with implementation step.Fig. 3 and Fig. 4 is the method and apparatus and the data processing method schematic diagram that carry out waterfrac treatment micro-seismic monitoring with the well head three-component analog or digital wave detector of four mouthfuls of wells.The speed propagated in steel sleeve according to known sound wave and sound wave are at the travel-time difference value Δ t of the compressional wave be recorded to by the velocity of propagation (known) in fracturing stratum and well head and shear wave
1, Δ t
2, Δ t
3, Δ t
4, the microearthquake signal (1) calculated propagates into the distance (X1, X2, X3, X4) on monitor well sleeve pipe along horizontal direction;
Wherein the computing formula of X1, X2, X3, X4 is:
X1=（Δt
1－H（V
2P－V
2S）/V
2PV
2S）（V
1P－V
1S）/V
1PV
1S （4）
X2=（Δt
2－H（V
2P－V
2S）/V
2PV
2S）（V
1P－V
1S）/V
1PV
1S （5）
X3=（Δt
3－H（V
2P－V
2S）/V
2PV
2S）（V
1P－V
1S）/V
1PV
1S （6）
X4=（Δt
4－H（V
2P－V
2S）/V
2PV
2S）（V
1P－V
1S）/V
1PV
1S （7）
Δ t
1, Δ t
2, Δ t
3, Δ t
4it is the travel-time difference value of the compressional wave that is recorded to of every mouthful of monitor well well head three-component seismometer and shear wave.
Thus the annular trace (see figure 4) of the corresponding every mouthful of monitor well of possible rock burst point (microearthquake source location) at floor projection can be obtained; The annular trace of described floor projection be respectively with monitor well (2,3,4,5) for the center of circle, respectively with four projections of circle on ground directly propagating into distance X1 on monitor well sleeve pipe in the horizontal direction, X2, X3, X4 are radius;
(the X of coordinate in length and breadth of the subpoint of point on ground that the vertical buried depth (H) of defeating knick point according to known water and the distance of X1, X2, X3 and X4 calculated and three annulus intersect jointly, Y) parameter, just positioningly can descend the position coordinates (X of rock burst point exactly, Y, H) parameter, completes the work of waterfrac treatment micro-seismic monitoring.
In addition, the compressional wave that the microearthquake signal excited during rock burst produces and shear wave energy also can (see figure 1)s on the three-component analog or digital wave detector 5,6,7 that point directly propagates into more than three mouthfuls or three mouthfuls monitor well wellhead casing pipes being placed near hydraulically fractured wells along shortest path R1, R2, R3 from rock burst.But because stratum is to the reason such as the absorption of the microearthquake signal energy excited during rock burst, travel path be complicated, carry out compared with waterfrac treatment monitors with utilizing the microearthquake signal propagated in pit shaft, current ground micro-seismic is monitored the direct wave data obtained and is had that microseismic event is few, signal to noise ratio (S/N ratio) is low, inverting poor reliability, is difficult to accurately locate rock burst point.
But the compressional wave upwards propagated that the microearthquake signal excited during rock burst produces and the loss of shear wave energy in steel sleeve very little, the three-component analog or digital wave detector be laid on the wellhead casing pipe of more than three mouthfuls or three mouthfuls monitor wells near hydraulically fractured wells can be recorded to compressional wave and the shear wave signal of the higher microearthquake of signal to noise ratio (S/N ratio), is similar to three-component seismometer in missile silo and arranges the microearthquake signal of the through high s/n ratio be recorded to.
Ground monitoring well well head more than three mouthfuls or three mouthfuls settles three-component seismometer to carry out waterfrac treatment micro-seismic monitoring, the geometric position coordinate of rock burst point can be descended rapidly and accurately definitely, the real-time dynamic imaging in crack produced for oil field low permeability reservoir and shale reservoir hydrfracturing and fast ram compression later evaluation at pressing crack construction scene.
According to the known subsurface formations of Sonic Logging Data and the required elastic wave velocity carrying out the reservoir of fracturing reform, also vertical buried depth H and the velocity of propagation of elastic wave in Steel Casing of waterfrac treatment point is known, by processing compressional wave and the shear wave travel-time difference value of compressional wave and the shear wave data acquisition be recorded on the three-component analog or digital wave detector of more than three or three well heads, just can calculate the annular trace of the corresponding every mouthful of monitor well of possible rock burst point at floor projection, namely respectively with monitor well 2, 3, 4 is the center of circle, respectively with X1, X2, X3 is three annulus of radius, and the point that three annulus intersect jointly is exactly from monitor well 2, 3, the projection (see figure 2) of the accurate breakdown point of subsurface rock on ground of location in 4.Therefore, the ground monitoring point applying more than three or three positioningly can descend the position of rock burst point exactly, and this method and apparatus utilizing well head three-component seismometer to carry out waterfrac treatment micro-seismic monitoring can be applied to crack dynamic imaging and the work of fast ram compression later evaluation of oil field low permeability reservoir and shale reservoir hydrfracturing.
Claims (6)
1. utilize well head three-component seismometer to carry out a method for waterfrac treatment micro-seismic monitoring, feature adopts following steps to realize:
1) around fractured well, select arbitrarily the ground monitoring well of more than three mouthfuls or three mouthfuls, a three-component analog or digital wave detector is installed respectively outside every mouthful of monitor well wellhead casing pipe;
2) well head installs the microearthquake signal produced when three-component seismometer Real-time Collection record subsurface rock breaks under high-pressure hydraulic effect;
3) speed propagated in steel sleeve according to sound wave and the compressional wave of sound wave in the micro-seismic event be recorded to by the velocity of propagation in fracturing stratum and each well head and the travel-time difference value of shear wave, the microearthquake signal calculated propagates into the distance on monitor well sleeve pipe along horizontal direction, obtain the annular trace of the corresponding every mouthful of monitor well in possible rock burst point position at floor projection;
4) the vertical buried depth of knick point, compressional wave and the velocity of propagation of shear wave in Steel Casing, compressional wave and the shear wave travel-time difference value at the compressional wave be recorded to from rock burst point to the velocity of propagation in the stratum of monitor well, at well head and shear wave is defeated according to known water, the coordinate parameters in length and breadth of the subpoint of point on ground that the Distance geometry annulus that microseismic signals propagates on monitor well sleeve pipe along horizontal direction intersects jointly, positioningly can descend the position coordinate parameters of rock burst point exactly, complete waterfrac treatment micro-seismic monitoring.
2. method according to claim 1, feature is described wave detector is three-component analog or digital wave detector.
3. method according to claim 1, feature is that the circumferential clasp of described detection metal v-belt fastening bolt is fixed on outside wellhead casing pipe.
4. method according to claim 1, to be described acquisition and recording be feature by the compressional wave of vehicle-mounted or ground multichannel seismic data acquisition system record micro-seismic event and shear wave signal.
5. method according to claim 1, feature to be the compressional wave of described micro-seismic event and shear wave signal be from rock burst point horizontally layer propagate into each monitor well with shortest path, then convert the compressional wave and shear wave signal upwards propagated along steel sleeve to.
6. method according to claim 1, feature is the annular trace of described floor projection is be the center of circle respectively with monitor well, directly propagates into bee-line on monitor well sleeve pipe in the horizontal direction for radius circle is in the projection on ground respectively with microseismic event signal.
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| CN106054239A (en) * | 2016-05-23 | 2016-10-26 | 中国石油集团川庆钻探工程有限公司地球物理勘探公司 | Microseismic pressing crack monitoring observation method |
| CN106353527A (en) * | 2015-07-14 | 2017-01-25 | 中国石油化工股份有限公司 | Method for measuring extending speed of artificial fractured fissure in rock in preset direction |
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