CN110107282A - A kind of paper shale grease horizontal well is with boring method for controlling trajectory - Google Patents
A kind of paper shale grease horizontal well is with boring method for controlling trajectory Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000004519 grease Substances 0.000 title claims abstract description 15
- 235000021185 dessert Nutrition 0.000 claims abstract description 84
- 238000005553 drilling Methods 0.000 claims abstract description 19
- 241001074085 Scophthalmus aquosus Species 0.000 claims abstract description 15
- 238000013461 design Methods 0.000 claims abstract description 11
- 238000005457 optimization Methods 0.000 claims abstract description 10
- 239000003079 shale oil Substances 0.000 claims abstract description 10
- 230000004044 response Effects 0.000 claims abstract description 8
- 238000012546 transfer Methods 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention discloses a kind of paper shale grease horizontal wells with brill method for controlling trajectory, comprising the following steps: 1) determines optimal artificial synthesized seismic channel, window when generating earthquake dessert according to horizontal well dessert section seismic velocity；2) dessert segment standard log response curve is established using the corresponding form of fixed well log, and prediction log is generated according to shale oil horizontal well design track；3) in drilling course, according to Real-time Logging curve, reference mark interval well logging absolute value and amplitude of variation are adjusted in time with brill track, beneficial effects of the present invention: 1) in human intervention, depth relationship when establishing more accurate；2) when the basis established of depth relationship on, earthquake profile position where calculating dessert top bottom determines dessert time window, and by live fluoroscopic drill bit position in drilling process, optimization is with boring track；3) the area stratum standard log curve is established using fixed well and stratigraphic dip, adjusts track in time, improve reservoir-encountered rate.
Description
Technical field:
The present invention relates to oil exploration technology fields, more particularly to a kind of paper shale grease horizontal well with brill TRAJECTORY CONTROL
The technical field of method.
Background technique:
The vertical thickness of marine facies shale oil dessert generally between 20~90m, stablize by plane distribution, and attitude of stratum is stablized, and is fitted
Heshui horizontal well scale development.Based on terrestrial lake basin, terrestrial facies shale oil dessert spatial distribution stability is opposite for China oil basin
Poor, for vertical thickness generally between 6~15m, plane distribution has apparent mid-depth, dessert thinner thickness and variation
Fastly, plane distribution stability is poor, continuous in dessert section to how accurately to control well track during shale oil horizontal well construction
Drilling brings problem.In view of the above problems, the present invention sums up a kind of paper shale grease horizontal well with boring method for controlling trajectory, land
Practicable technical method is provided with brill TRAJECTORY CONTROL during phase lake basin paper shale oil gas horizontal well construction.
Summary of the invention:
The object of the invention is that providing a kind of paper shale grease horizontal well with boring track to solve the above-mentioned problems
Control method solves the problems, such as existing at present.
To solve the above-mentioned problems, the present invention provides a kind of technical solutions:
A kind of paper shale grease horizontal well is with boring method for controlling trajectory, comprising the following steps:
1) optimal artificial synthesized seismic channel is determined, window when generating earthquake dessert according to horizontal well dessert section seismic velocity；
2) dessert segment standard log response curve is established using the corresponding form of fixed well log, and according to shale grease
Horizontal well planned course generates prediction log；
3) in drilling course, according to Real-time Logging curve, reference mark interval well logging absolute value and amplitude of variation are adjusted in time
It is whole with bore track.
Preferably, optimal artificial synthesized seismic channel is determined in the step 1), according to horizontal well dessert section seismic velocity
Window determines 2 parts when window mainly includes holostrome Duan Jingzhen calibration and horizontal well earthquake dessert when generating earthquake dessert.
Preferably, holostrome Duan Jingzhen calibration the following steps are included:
A., optimal artificial synthesized seismic channel is determined；
Individual well geological layering by well head to shaft bottom number consecutively be G1, G2, Gn, utilize acoustic travel time logging bent
Line (AC) artificial synthesized seismic channel correspond to time depth be Gt1, Gt2, Gtn, seismic interpretation interface corresponds to time depth
From top to bottom number consecutively be T1, T2, Tn；
It defines well and shakes degree of fitting DF formula:
Wherein, Gt1, Gt2, Gtn be that artificial synthetic seismogram corresponds to time depth, T1, T2, Tn be
Seismic interpretation interface corresponds to time depth；Well shake degree of fitting df value is smaller, and it is higher to represent well shake fitting degree.
Mean value is denoted as avgAC in interval transit time curve measuring point depth bounds；
WhenWhen, avgAC is bigger than normal or less than normal, causes artificial synthesized earthquake result and earthquake reflective data
It is not inconsistent, needs artificially to adjust avgAC value at this time, artificial synthesized record is corrected, reduces DF value according to this, it is quasi- to improve well shake
Conjunction degree is higher；
WhenWhen, avgAC is bigger than normal, and the corresponding df value of avgAC is denoted as DF0, and interval transit time value is integrally subtracted
Small fixed value a (generally taking 5~10) re-starts artificial synthesized earthquake using the interval transit time curve newly obtained and notes down, right
The df value answered is denoted as df1.The step is repeated, until Successively determine DF2, DF3, DFn, take DF
The corresponding artificial synthesized seismic channel of minimum value is optimal synthetic seismogram；
WhenWhen, avgAC is less than normal, and the corresponding DF value of avgAC is denoted as DF0, and interval transit time value is integrally increased
Add a fixed value a (generally taking 5~10), re-starts artificial synthesized earthquake using the interval transit time curve newly obtained and note down, it is right
The df value answered is denoted as DF1.The step is repeated, until Successively determine DF2, DF3, DFn, take DF
The corresponding artificial synthesized seismic channel of minimum value is optimal artificial synthesized seismic channel.
B, the artificial synthesized seismic channel of layer series optimization is divided to determine；
For lineups included in the interface seismic interpretation T1 and T2 from the bottom to top respectively number be t1, t2,
Tm, take-off depth number consecutively corresponding to individual well be g1, g2, gm, it is deep that optimal artificial synthesized seismic channel correspond to the time
Degree be gt1, gt2, gtm；
It defines well and shakes degree of fitting df formula:
Wherein, gt1, gt2, gtn be that artificial synthetic seismogram corresponds to time depth, t1, t2, tn be
Seismic interpretation interface corresponds to time depth.Well shake degree of fitting df value is smaller, and it is higher to represent well shake fitting degree；
Mean value is denoted as avgac in interval transit time curve measuring point depth bounds.
WhenWhen, avgac is bigger than normal or less than normal, causes artificial synthesized earthquake result and earthquake reflective data
It is not inconsistent, needs artificially to adjust avgac value at this time, artificial synthesized record is corrected, reduces df value according to this, it is quasi- to improve well shake
Conjunction degree is higher.
WhenWhen, avgAC is bigger than normal, and the corresponding df value of avgAC is denoted as df0, and interval transit time value is integrally subtracted
Small fixed value a (generally taking 3~6) re-starts artificial synthesized earthquake using the interval transit time curve newly obtained and notes down, corresponding
Df value be denoted as df1.The step is repeated, until Successively determine df2, df3, dfn, take df most
It is small to be worth corresponding artificial synthesized seismic channel optimal synthetic seismogram between the interface T1 and T2.
WhenWhen, avgAC is less than normal, and the corresponding df value of avgAC is denoted as df0, and interval transit time value is integrally increased
Add a fixed value a (generally taking 3~6), re-starts artificial synthesized earthquake using the interval transit time curve newly obtained and note down, it is corresponding
Df value be denoted as df1.The step is repeated, until Successively determine df2, df3, dfn, take df most
It is small to be worth corresponding artificial synthesized seismic channel optimal artificial synthesized seismic channel between the interface T1 and T2.
Repeat the above steps, successively optimize T2~T3, T3~T4, the axis of reflection between Tn-1~Tn so that most
Excellent artificial synthesized seismic channel is in optimum state, and establishes time and depth transfer relationship.
Preferably, when the earthquake dessert window it is determining the following steps are included:
A steady reflection lineups are found in the corresponding seismic reflector of dessert body, by Event tracking,
Dessert steady reflection interface t, seismic velocity v in dessert section depth bounds are found in three-dimensional space.On steady reflection interface
Dessert body is denoted as Su, and thickness is denoted as du, and dessert body is denoted as Sd under steady reflection interface, and thickness is denoted as dd, and dessert time window is
(t-du/v, t+dd/v).If steady reflection lineups are in the top of dessert body, dessert time window is (t, t+dd/v).
If steady reflection lineups are in the bottom of dessert body, dessert time window is (t-du/v, t).
Wherein, in the step 2), dessert segment standard log response is established using the corresponding form of fixed well log
Curve, and prediction log is generated according to shale oil horizontal well design track.
1. standard log curve calculates；
The geologic body limited by G1 and G2, O point are the intersection points of well 1 Yu geological interface G1, and Q point is well 1 and geological interface G2
Intersection point, geologic dip α, P are any points in drilling well, which is β, and P ' is that P point (hangs down in the projection of vertical direction
It is deep), P " is projection of the P point on ground layer vertical.OP is known length section, and OP is ground layer vertical projected length (OP "=OP
Sin α/cos β), for any point P, unique subpoint P " can be found in OQ ".OQ " is the true thickness of geologic body, referred to as
For standard paragraphs, assigns log value measured by all measuring point P to OP ", both obtained geologic body standard log curve.
The step is repeated, the standard log curve A of all geologic bodies is obtained.
2. generating horizontal wellbore logging curve according to planned course；
The intersection point A of planned well and geological interface G1, the intersection point with geological interface G2 are B, and P is any designed on well location
Point, the point design hole angle are β, and P point point corresponding with standard log curve is P ", and geologic body inclination angle is that the α hole angle is
β then has AP=OQ " cos β/sin α), for any point P, unique subpoint P " can be found therewith in standard paragraphs OQ "
It is corresponding.By establishing the projection relation between OQ " and AB, the corresponding standard log curve values of P " point are assigned to P point
Planned well is obtained in the intracorporal prediction log of the geology.
The step is repeated, prediction log is carried out to geologic body in all design well sections and is calculated, and then obtains all set
It counts the full well section of well and predicts log B.
Preferably, in drilling course, the relationship between measured curve and prediction curve is compared in the step 3), and
According to time and depth transfer relationship, optimization in time is as follows with Trace step is bored:
(1) well logging curve monitors in real time: real time contrast surveys log and predicts the relationship between log,
According to the distance between measuring instrument and drill bit, drill bit position is grasped in time；
(2) earthquake trajectory real-time monitoring: utilizing time and depth transfer relationship, wellbore trace projected in seismic data body, and
According to brill track position relative position in dessert body；
(3) optimize well track in time: according to measured curve position and earthquake trajectory position, being provided by reference lamina and continue to bore
Into, increasing hole angle or drop angle instruction, until finishing drilling.
Beneficial effects of the present invention:
1) in human intervention, the relationship between geological layering and known seismic event is provided, it is quasi- by setting
Conjunction condition, using the best fit position between Computer Automatic Search geological layering and seismic reflector, by seismic interpretation
Control errors are within 2m, depth relationship when establishing more accurate.
2) when the basis established of depth relationship on, neighbouring seismic reflection lineups of positioning dessert body, and carry out same-phase
Earthquake tracking, according to dessert thickness, earthquake profile position where calculating dessert top bottom determines dessert time window, in drilling well
By live fluoroscopic drill bit position in journey, optimization is with brill track.
3) the area stratum standard log curve is established using fixed well and stratigraphic dip, by standard log curve projection to setting
Count horizontal well path, generate prediction log, in Horizontal Well Drilling into the process, by comparison with bore curve and prediction curve it
Between relationship, adjust track in time, improve reservoir-encountered rate.
Detailed description of the invention:
Detailed description will be given by the following detailed implementation and drawings by the present invention for ease of explanation,.
Fig. 1 is the broken line schematic diagram of seismic event of the present invention and take-off depth；
Window determines schematic diagram when Fig. 2 is earthquake dessert of the invention；
Fig. 3 is seismic interpretation schematic diagram of the invention；
Fig. 4 is calculating GR and resistivity schematic diagram of the invention；
Fig. 5 is earthquake of the invention and track schematic diagram；
Fig. 6 is the structural schematic diagram of log A of the invention；
Fig. 7 is the structural schematic diagram of log B of the invention.
Specific embodiment:
First embodiment: as shown in figs. 1-7, present embodiment uses following technical scheme: a kind of paper shale oil
Horizontal well is with brill method for controlling trajectory, comprising the following steps:
1) optimal artificial synthesized seismic channel is determined, window when generating earthquake dessert according to horizontal well dessert section seismic velocity；
2) dessert segment standard log response curve is established using the corresponding form of fixed well log, and according to shale grease
Horizontal well planned course generates prediction log；
3) in drilling course, according to Real-time Logging curve, reference mark interval well logging absolute value and amplitude of variation are adjusted in time
It is whole with bore track.
Wherein, it in the step 1), determines optimal artificial synthesized seismic channel, is generated according to horizontal well dessert section seismic velocity
Window determines 2 parts when window mainly includes holostrome Duan Jingzhen calibration and horizontal well earthquake dessert when earthquake dessert.
Wherein, holostrome Duan Jingzhen calibration the following steps are included:
A., optimal artificial synthesized seismic channel is determined；
Individual well geological layering by well head to shaft bottom number consecutively be G1, G2, Gn, utilize acoustic travel time logging bent
Line (AC) artificial synthesized seismic channel correspond to time depth be Gt1, Gt2, Gtn, seismic interpretation interface corresponds to time depth
From top to bottom number consecutively be T1, T2, Tn.
It defines well and shakes degree of fitting DF formula:
Wherein, Gt1, Gt2, Gtn be that artificial synthetic seismogram corresponds to time depth, T1, T2, Tn be
Seismic interpretation interface corresponds to time depth.Well shake degree of fitting df value is smaller, and it is higher to represent well shake fitting degree.
Mean value is denoted as avgAC in interval transit time curve measuring point depth bounds.
WhenWhen, avgAC is bigger than normal or less than normal, causes artificial synthesized earthquake result and earthquake reflective data
It is not inconsistent, needs artificially to adjust avgAC value at this time, artificial synthesized record is corrected, reduces DF value according to this, it is quasi- to improve well shake
Conjunction degree is higher.
WhenWhen, avgAC is bigger than normal, and the corresponding df value of avgAC is denoted as DF0, and interval transit time value is integrally subtracted
Small fixed value a (generally taking 5~10) re-starts artificial synthesized earthquake using the interval transit time curve newly obtained and notes down, right
The df value answered is denoted as df1.The step is repeated, until Successively determine DF2, DF3, DFn, take DF
The corresponding artificial synthesized seismic channel of minimum value is optimal synthetic seismogram.
WhenWhen, avgAC is less than normal, and the corresponding DF value of avgAC is denoted as DF0, and interval transit time value is integrally increased
Add a fixed value a (generally taking 5~10), re-starts artificial synthesized earthquake using the interval transit time curve newly obtained and note down, it is right
The df value answered is denoted as DF1.The step is repeated, until Successively determine DF2, DF3, DFn, take DF
The corresponding artificial synthesized seismic channel of minimum value is optimal artificial synthesized seismic channel.
B, the artificial synthesized seismic channel of layer series optimization is divided to determine；
For lineups included in the interface seismic interpretation T1 and T2 from the bottom to top respectively number be t1, t2,
Tm, take-off depth number consecutively corresponding to individual well be g1, g2, gm, it is deep that optimal artificial synthesized seismic channel correspond to the time
Degree be gt1, gt2, gtm.
It defines well and shakes degree of fitting df formula:
Wherein, gt1, gt2, gtn be that artificial synthetic seismogram corresponds to time depth, t1, t2, tn be
Seismic interpretation interface corresponds to time depth.Well shake degree of fitting df value is smaller, and it is higher to represent well shake fitting degree.
Mean value is denoted as avgac in interval transit time curve measuring point depth bounds.
WhenWhen, avgac is bigger than normal or less than normal, causes artificial synthesized earthquake result and earthquake reflective data not
Symbol, needs artificially adjust avgac value at this time, is corrected to artificial synthesized record, according to this to reduce df value, improves well and shakes and is fitted
Degree is higher.
WhenWhen, avgAC is bigger than normal, and the corresponding df value of avgAC is denoted as df0, and interval transit time value is integrally subtracted
Small fixed value a (generally taking 3~6) re-starts artificial synthesized earthquake using the interval transit time curve newly obtained and notes down, corresponding
Df value be denoted as df1.The step is repeated, until Successively determine df2, df3, dfn, take df most
It is small to be worth corresponding artificial synthesized seismic channel optimal synthetic seismogram between the interface T1 and T2.
WhenWhen, avgAC is less than normal, and the corresponding df value of avgAC is denoted as df0, and interval transit time value is integrally increased
Add a fixed value a (generally taking 3~6), re-starts artificial synthesized earthquake using the interval transit time curve newly obtained and note down, it is corresponding
Df value be denoted as df1.The step is repeated, until Successively determine df2, df3, dfn, take df most
It is small to be worth corresponding artificial synthesized seismic channel optimal artificial synthesized seismic channel between the interface T1 and T2.
Repeat the above steps, successively optimize T2~T3, T3~T4, the axis of reflection between Tn-1~Tn so that most
Excellent artificial synthesized seismic channel is in optimum state, and establishes time and depth transfer relationship.
Wherein, when the earthquake dessert window it is determining the following steps are included:
A steady reflection lineups are found in the corresponding seismic reflector of dessert body, by Event tracking,
Dessert steady reflection interface t, seismic velocity v in dessert section depth bounds are found in three-dimensional space.On steady reflection interface
Dessert body is denoted as Su, and thickness is denoted as du, and dessert body is denoted as Sd under steady reflection interface, and thickness is denoted as dd, and dessert time window is
(t-du/v, t+dd/v).If steady reflection lineups are in the top of dessert body, dessert time window is (t, t+dd/v).
If steady reflection lineups are in the bottom of dessert body, dessert time window is (t-du/v, t).
Wherein, in the step 2), dessert segment standard log response is established using the corresponding form of fixed well log
Curve, and prediction log is generated according to shale oil horizontal well design track.
1. standard log curve calculates；
The geologic body limited by G1 and G2, O point are the intersection points of well 1 Yu geological interface G1, and Q point is well 1 and geological interface G2
Intersection point, geologic dip α, P are any points in drilling well, which is β, and P ' is that P point (hangs down in the projection of vertical direction
It is deep), P " is projection of the P point on ground layer vertical.OP is known length section, and OP is ground layer vertical projected length (OP "=OP
Sin α/cos β), for any point P, unique subpoint P " can be found in OQ ".OQ " is the true thickness of geologic body, referred to as
For standard paragraphs, assigns log value measured by all measuring point P to OP ", both obtained geologic body standard log curve.
The step is repeated, the standard log curve A of all geologic bodies is obtained.
2. generating horizontal wellbore logging curve according to planned course；
The intersection point A of planned well and geological interface G1, the intersection point with geological interface G2 are B, and P is any designed on well location
Point, the point design hole angle are β, and P point point corresponding with standard log curve is P ", and geologic body inclination angle is that the α hole angle is
β then has AP=OQ " cos β/sin α), for any point P, unique subpoint P " can be found therewith in standard paragraphs OQ "
It is corresponding.By establishing the projection relation between OQ " and AB, the corresponding standard log curve values of P " point are assigned to P point
Planned well is obtained in the intracorporal prediction log of the geology.
The step is repeated, prediction log is carried out to geologic body in all design well sections and is calculated, and then obtains all set
It counts the full well section of well and predicts log B.
Wherein, in the step 3), in drilling course, the relationship between measured curve and prediction curve is compared, and according to
Time and depth transfer relationship, in time optimization are as follows with Trace step is bored:
(1) well logging curve monitors in real time: real time contrast surveys log and predicts the relationship between log,
According to the distance between measuring instrument and drill bit, drill bit position is grasped in time；
(2) earthquake trajectory real-time monitoring: utilizing time and depth transfer relationship, wellbore trace projected in seismic data body, and
According to brill track position relative position in dessert body；
(3) optimize well track in time: according to measured curve position and earthquake trajectory position, being provided by reference lamina and continue to bore
Into, increasing hole angle or drop angle instruction, until finishing drilling.
Second embodiment:
1) optimal artificial synthesized seismic channel is determined, window when generating earthquake dessert according to horizontal well dessert section seismic velocity.
1. holostrome Duan Jingzhen is demarcated.
A. optimal artificial synthesized seismic channel is determined.
The well section co-exists in G1、G2And G3Totally 3 geological layerings, artificial synthesizedly using acoustic travel time logging curve (AC)
It is G that shake road, which corresponds to time depth,t1、Gt2And Gtn, seismic interpretation interface corresponds to time depth, and from top to bottom number consecutively is T1、T2With
Tn, as shown in attached drawing 1-A.
It defines well and shakes degree of fitting DF formula:
Wherein, Gt1、Gt2、···、GtnTime depth, T are corresponded to for artificial synthetic seismogram1、T2、···、TnFor ground
Shake explains that interface corresponds to time depth.
By computer search DF minimum value, optimal location corresponding to geological interface is determined, as shown in attached drawing 1-B.
B. optimize T1And T2Artificial synthesized seismic channel between reflecting interface.
Seismic interpretation T1And T2Number is t to included lineups respectively from the bottom to top in interface1、t2、···、t15, single
Take-off depth number consecutively corresponding to well is g1、g2、···、g15, optimal artificial synthesized seismic channel corresponds to time depth and is
gt1、gt2、···、gt15。
It defines well and shakes degree of fitting df formula:
Wherein, gt1、gt2、···、gtnTime depth, t are corresponded to for artificial synthetic seismogram1、t2、···、tnFor ground
Shake explains that interface corresponds to time depth.By computer search df minimum value, optimal location corresponding to each lineups is determined, such as
Shown in attached drawing 1-C.
2. window determines when earthquake dessert.
(buried depth 3104.46m) and seismic reflection zero phase phase (time depth 25063.62ms) are right at the top of the well dessert
It answers, dessert thickness d d is 6.1m, buried depth 3110.56m, time depth 2509.88ms, and dessert body seismic velocity is
1.87m/ms (double-pass reflection time).The dessert time, area's dessert plane distribution was stablized with a thickness of 3.26ms, window when earthquake dessert
For (zero phase, zero phase+3.26ms), window is as shown in Fig. 2 when the earthquake dessert of generation.
2) dessert segment standard log response curve is established using the corresponding form of fixed well log, and according to shale grease
Horizontal well planned course generates prediction log.
For C1 on C2 dessert section top, stratigraphic dip is about 10 ° of α, is converted by projection, C1 and C2 segment standard log
As shown in Fig. 3.According to the track design level Jing Jing, C1 and C2 layers is projected on horizontal well, as a result as shown in Fig. 4.
Wherein, in step 3), in drilling course, compare the relationship between measured curve and prediction curve, and according to when
Deep transformational relation, optimization in time is with brill track.
In drilling process, prediction curve and measured curve similarity demonstrate the reliable of prediction log up to 90%
Property, and 80 meters of predictions in advance enter and leave window point position, realize that horizontal well smoothly enters window.
Stratigraphic dip change point is found in earthquake dessert cabinet as TRAJECTORY CONTROL OF HORIZONTAL WELL point.Incline on 1 stratum of control point
Angle increases to 10.4 ° by 9.3 °, when rotary head is close to control point 1, issues drop angle instruction, hole angle is reduced to by 81.7 °
89.6°.2 stratigraphic dip of control point increases to 8.2 ° by 10.4 °, when rotary head is close to control point 2, increasing hole angle instruction is issued, by well
Oblique angle increases to 91.8 ° by 89.6 °.3 stratigraphic dip of control point increases to 9.5 ° by 8.2 °, when rotary head is close to control point 3, hair
Drop angle instructs out, and hole angle is reduced to 90.5 ° by 91.8 °.
SL1 horizontal well is satisfactorily completed by the above method with track optimizing work is bored, horizontal segment length 1019m, oil reservoir, which bores, meets
Rate 100%, completes scheduled target, which obtains high yield commercial oil by volume fracturing, obtains better effects.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention, the technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention, the claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (5)
1. a kind of paper shale grease horizontal well is with brill method for controlling trajectory, which comprises the following steps:
1) optimal artificial synthesized seismic channel, is determined, window when generating earthquake dessert according to horizontal well dessert section seismic velocity；
2) dessert segment standard log response curve, is established using the corresponding form of fixed well log, and according to shale oil level
Well planned course generates prediction log；
3), in drilling course, according to Real-time Logging curve, reference mark interval well logging absolute value and amplitude of variation adjust in time with
Bore track.
2. a kind of paper shale grease horizontal well according to claim 1 is with brill method for controlling trajectory, it is characterised in that: described
In step 1), optimal artificial synthesized seismic channel is determined, window is main when generating earthquake dessert according to horizontal well dessert section seismic velocity
2 parts are determined with window when horizontal well earthquake dessert including holostrome Duan Jingzhen calibration.
3. a kind of paper shale grease horizontal well according to claim 2 is with brill method for controlling trajectory, it is characterised in that: described
Holostrome Duan Jingzhen calibration the following steps are included:
A., optimal artificial synthesized seismic channel is determined；
Individual well geological layering by well head to shaft bottom number consecutively be G1, G2, Gn, utilize acoustic travel time logging curve
(AC) artificial synthesized seismic channel correspond to time depth be Gt1, Gt2, Gtn, seismic interpretation interface correspond to time depth by
Up to lower number consecutively be T1, T2, Tn；
It defines well and shakes degree of fitting DF formula:
Wherein, Gt1, Gt2, Gtn be that artificial synthetic seismogram correspond to time depth, T1, T2, Tn be earthquake
Explain that interface corresponds to time depth.Well shake degree of fitting df value is smaller, and it is higher to represent well shake fitting degree；
Mean value is denoted as avgAC in interval transit time curve measuring point depth bounds；
WhenWhen, avgAC is bigger than normal or less than normal, and cause artificial synthesized earthquake result not to be inconsistent with earthquake reflective data,
It needs artificially to adjust avgAC value at this time, artificial synthesized record is corrected, reduce DF value according to this, improve well shake fitting journey
It spends higher；
WhenWhen, avgAC is bigger than normal, and the corresponding df value of avgAC is denoted as DF0, and interval transit time value is integrally reduced one
Fixed value a (generally takes 5~10), re-starts artificial synthesized earthquake using the interval transit time curve newly obtained and notes down, corresponding
Df value is denoted as df1.The step is repeated, until Successively determine DF2, DF3, DFn, take DF minimum
Being worth corresponding artificial synthesized seismic channel is optimal synthetic seismogram；
WhenWhen, avgAC is less than normal, and the corresponding DF value of avgAC is denoted as DF0, and interval transit time value is integrally increased by one
Fixed value a (generally takes 5~10), re-starts artificial synthesized earthquake using the interval transit time curve newly obtained and notes down, corresponding
Df value is denoted as DF1；The step is repeated, until Successively determine DF2, DF3, DFn, take DF minimum
Being worth corresponding artificial synthesized seismic channel is optimal artificial synthesized seismic channel；
B, the artificial synthesized seismic channel of layer series optimization is divided to determine；
For lineups included in the interface seismic interpretation T1 and T2 from the bottom to top respectively number be t1, t2, tm,
Take-off depth number consecutively corresponding to individual well be g1, g2, gm, optimal artificial synthesized seismic channel corresponds to time depth
For gt1, gt2, gtm；
It defines well and shakes degree of fitting df formula:
Wherein, gt1, gt2, gtn be that artificial synthetic seismogram correspond to time depth, t1, t2, tn be earthquake
Explain that interface corresponds to time depth.Well shake degree of fitting df value is smaller, and it is higher to represent well shake fitting degree；
Mean value is denoted as avgac in interval transit time curve measuring point depth bounds；
WhenWhen, avgac is bigger than normal or less than normal, and cause artificial synthesized earthquake result not to be inconsistent with earthquake reflective data,
It needs artificially to adjust avgac value at this time, artificial synthesized record is corrected, reduce df value according to this, improve well shake fitting journey
It spends higher；
WhenWhen, avgAC is bigger than normal, and the corresponding df value of avgAC is denoted as df0, and interval transit time value is integrally reduced one
Fixed value a (generally takes 3~6), re-starts artificial synthesized earthquake using the interval transit time curve newly obtained and notes down, corresponding df
Value is denoted as df1；The step is repeated, until Successively determine df2, df3, dfn, take df minimum value
Corresponding artificial synthesized seismic channel optimal synthetic seismogram between the interface T1 and T2；
WhenWhen, avgAC is less than normal, and the corresponding df value of avgAC is denoted as df0, and interval transit time value is integrally increased by one
Fixed value a (generally takes 3~6), re-starts artificial synthesized earthquake using the interval transit time curve newly obtained and notes down, corresponding df
Value is denoted as df1；The step is repeated, until Successively determine df2, df3, dfn, take df minimum value
Corresponding artificial synthesized seismic channel optimal artificial synthesized seismic channel between the interface T1 and T2；
Repeat the above steps, successively optimize T2~T3, T3~T4, the axis of reflection between Tn-1~Tn so that optimal people
Work synthetic seismogram is in optimum state, and establishes time and depth transfer relationship.
4. a kind of paper shale grease horizontal well according to claim 2 is with brill method for controlling trajectory, it is characterised in that: described
When earthquake dessert window it is determining the following steps are included:
A steady reflection lineups are found in the corresponding seismic reflector of dessert body, by Event tracking, in three-dimensional
Dessert steady reflection interface t, seismic velocity v in dessert section depth bounds are found in space.Dessert on steady reflection interface
Body is denoted as Su, and thickness is denoted as du, and dessert body is denoted as Sd under steady reflection interface, and thickness is denoted as dd, and dessert time window is (t-
Du/v, t+dd/v)；If steady reflection lineups are in the top of dessert body, dessert time window is (t, t+dd/v)；If steady
Determine the bottom that reflection line-ups are in dessert body, then dessert time window is (t-du/v, t)；
Wherein, in the step 2), dessert segment standard log response curve is established using the corresponding form of fixed well log,
And prediction log is generated according to shale oil horizontal well design track；
1. standard log curve calculates；
The geologic body limited by G1 and G2, O point are the intersection points of well 1 Yu geological interface G1, and Q point is the friendship of well 1 Yu geological interface G2
Point, geologic dip α, P are any points in drilling well, which is β, and P ' is projection (vertical depth) of the P point in vertical direction, P "
It is projection of the P point on ground layer vertical；OP is known length section, and OP is ground layer vertical projected length (OP "=OPsin α/cos
β), for any point P, unique subpoint P " can be found in OQ "；OQ " is the true thickness of geologic body, referred to as standard
Section assigns log value measured by all measuring point P to OP ", had both obtained geologic body standard log curve；
The step is repeated, the standard log curve graph A of all geologic bodies is obtained；
2. generating horizontal wellbore logging curve according to planned course；
The intersection point A of planned well and geological interface G1, the intersection point with geological interface G2 are B, and P is any point designed on well location, should
Point design hole angle is β, and P point point corresponding with standard log curve is P ", and it is β that geologic body inclination angle, which is the α hole angle, then has
AP=OQ " cos β/sin α), for any point P, unique subpoint P " can be found in contrast in standard paragraphs OQ "
It answers；By establishing the projection relation between OQ " and AB, assigns the corresponding standard log curve values of P " point to P point, can be obtained
Planned well is in the intracorporal prediction log of the geology；
The step is repeated, prediction log is carried out to geologic body in all design well sections and is calculated, and then obtains all planned wells
Full well section predicts log B.
5. a kind of paper shale grease horizontal well according to claim 3 is with brill method for controlling trajectory, it is characterised in that: described
In step 3), in drilling course, the relationship between measured curve and prediction curve is compared, and according to time and depth transfer relationship, in time
Optimization is as follows with Trace step is bored:
(1) well logging curve monitors in real time: real time contrast surveys log and predicts the relationship between log, according to
The distance between measuring instrument and drill bit grasp drill bit position in time；
(2) earthquake trajectory real-time monitoring: utilizing time and depth transfer relationship, wellbore trace projected in seismic data body, and according to
With brill track position relative position in dessert body；
(3) in time optimization well track: according to measured curve position and earthquake trajectory position, provided by reference lamina continue creep into,
Increasing hole angle or drop angle instruction, until finishing drilling.
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