CN108316859B - Shale gas horizontal well enters method for controlling trajectory before target with geosteering is bored - Google Patents
Shale gas horizontal well enters method for controlling trajectory before target with geosteering is bored Download PDFInfo
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- 238000005553 drilling Methods 0.000 claims abstract description 11
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal 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
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
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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
- E21B47/09—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
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Abstract
The present invention relates to a kind of shale gas horizontal wells to enter method for controlling trajectory before target with geosteering is bored, and collects subject-oriented horizontal well region standard well, has bored and led a well, offset well geologic information；Subject-oriented well Drilling Design book, the real time data of subject-oriented well determine guiding standard well, with reference to well according to data；It determines guiding intervention point, determines guiding intermediate point；Control guiding intervention point extremely guiding intermediate point.Using subject-oriented well with standard well, with reference to the information contrast of well, geosteering reference lamina is divided, thus judges drill bit present position and stratigraphic dip；Changed according to reference lamina away from the vertical depth between guiding midpoint, the thick and stratigraphic dip that hangs down, distribution displacement, control build angle rate, guidance drill bit and control well track trend are crept into target.To guiding intermediate point, guiding intermediate point is controlled to two sections of target spot the present invention point guiding intervention point, and hole deviation is suitable, displacement is using rationally, and well track is round and smooth, and it is reasonable to enter target angle, and target spot controls that precision is high, and geosteering effect is good.
Description
Technical field
The present invention relates to shale gas exploration and development technologies, and in particular to a kind of shale gas horizontal well enters target with geosteering is bored
Preceding method for controlling trajectory.
Background technique
Shale gas development scheme mostly uses " well factory " horizontal well construction mode, as exploration targets is increasingly complicated, well pattern
It gathers, because Geological Reasons have strict demand to displacement is entered with complex situations, the target wells such as touching casing is evaded.
When entering target with brill geosteering, the geosteering based on Strata Comparison is used to enter Target process, it is main to be applicable in
In entering the relatively stable reservoir in target front upper place stratum.Self- steering intervention point is started, it is desirable that with the position of 400m~500m or so
Target is moved into, and before entering target, when top stratigraphic dip changes greatly, displacement usually occurs using unreasonable, build angle rate and stratum are hung down
The problems such as deep, displacement mismatches, causes middle target difficulty to increase, or even occurs failing by geologic requirements the phenomenon that target, in addition rail
Mark adjustment frequently, brings deleterious effect to later period pressing crack construction.
Therefore, it is badly in need of establishing have target requirement in shorter displacement at present, and the changeable geology of attitude of stratum above target spot
It is directed into method for controlling trajectory before target.
Summary of the invention
The purpose of the present invention is statuses in view of the above technology, it is desirable to provide and a kind of hole deviation is suitable, displacement is using rationally,
Well track is round and smooth, enters the control of target angle rationally, and target geological target spot and design geology error are small, and target spot controls precision height, ground
The apparent shale gas horizontal well of matter guide effect enters method for controlling trajectory before target with geosteering is bored.
The implementation of the object of the invention is, shale gas horizontal well enters method for controlling trajectory before target, tool with geosteering is bored
Steps are as follows for body:
Step 1: the data preparation stage
1) the regional standard well of subject-oriented horizontal well region is collected, has bored and has led a well and offset well geologic information；
The brill of the subject-oriented horizontal well region leads a well, offset well geologic information includes natural gamma, lithology, complete
Hydrocarbon, methane, TOC and oil testing result；
2) subject-oriented horizontal wells book is collected, there is wellblock seismic cross-section, planned course and target spot data；
3) real time data of the subject-oriented well of collection needs driftway guiding intervention point top with the real-time lithology data of brill, gas
Measured data, hole deviation data and with bore gamma data；
4) guiding standard well is determined, with reference to well according to data before boring；
Step 2: determining guiding intervention point, the guiding intermediate point of subject-oriented horizontal well
1) guiding intervention point is determined
It is compared according to guiding standard well and with reference to well, by designed by first step step 2), on corresponding target spot, stratum
The position of vertical thickness 250m is determined as guiding intervention point, 20 °~30 ° of hole deviation of guiding intervention, residual displacement ≮ 400m；
2) guiding intermediate point is determined
It is compared according to guiding standard well and with reference to well, by designed by first step step 2), on corresponding target spot, stratum
The position of vertical thickness 100m is determined as being oriented to intermediate point, residual displacement ≮ 300m；
Step 3: control guiding intervention point is extremely oriented to the track of intermediate point
1) control guiding intervention point 40 °~45 ° of angle of the intermediate locus of points and stratum, is led to the track for being oriented to intermediate point
γ ° of hole deviation to intervention point to guiding intermediate point is calculated as follows:
γ °=90 °-alpha-beta
In formula, α-target zone designs stratigraphic dip, have a down dip for+°, updip is-°；
β-centre locus of points and stratum angle °；
2) control guiding intervention point is to the track for being oriented to intermediate point, and control point stratum updip, have a down dip both of which；
(1) updip stratum is intervened point since guiding and is started with build angle rate K, K measurement unit for °/m, increasing hole angle creeps into guiding
Between point；Build angle rate is calculated as follows
K=(γ2-γ1)/(h×1.4)
In formula, γ1Guiding intervention point hole deviation °；
γ2It is oriented to intermediate point hole deviation °；
Hang down thickness m on h- guiding intervention point to guiding intermediate point stratum；
(2) have a down dip stratum: since guiding intervention point after angle holding drilling 50m~100m, making by the step (1) in step 2)
Slope formula increasing hole angle is crept into guiding intermediate point, and wherein h hangs down thick for beginning increasing hole angle point to stratum between guiding midpoint；
Step 4: guiding intermediate point is chosen to target spot Strata Comparison, determines reference lamina
1) using subject-oriented horizontal well region subject-oriented well and guiding standard well, with reference to well lithology, bore when, gas
Survey, hole deviation and with bore gamma data Characteristics of Mutation, carry out Strata Comparison, divide from guiding intermediate point to target spot geosteering mark
Will layer, correlation marker layer judge drill bit present position and stratigraphic dip；
2) the reference lamina comparing result divided according to guiding intermediate point to target spot, adjusts in time and modifies former Drilling Design target
Point；
Step 5: according to reference lamina away from the vertical depth between guiding midpoint, thickness of hanging down, in conjunction with the variation of stratigraphic dip, distribution displacement,
Build angle rate, guidance drill bit and control well track trend are controlled, is crept into target；
1) guiding intermediate point is to the stable monoclinal stratum of target spot attitude of stratum, acline, according to reference lamina away from guiding
Between put position, thickness reasonable distribution be displaced usage amount, control build angle rate；
2) the guiding intermediate point compound stratum changeable to target spot attitude of stratum, point stratum updip, have a down dip both of which, according to
Reference lamina is away from the vertical depth between guiding midpoint, thickness of hanging down, in conjunction with the variable quantity of stratigraphic dip, distribution displacement, control build angle rate；
Step 6: reaching target spot
According to the Strata Comparison that the 4th step carries out, judge whether drill bit reaches target area, reaches and then enter the 7th step；It does not reach
Then return to the 5th step；
Step 7: entering target control
1) according to the from top to bottom correlation marker layer segment assignments displacement, control build angle rate in order of the 5th step；
2) enter target mode: entering upper target frame when the updip of stratum, control 2 °~3 ° of incision angle；When stratum has a down dip, under
Target frame controls 1 °~2 ° of incision angle；
Step 8: effect assessment
It is evaluated by the horizontal wellbore quality target body examination range specifications of shale gas in geological design and rate of over-all angle change.
The present invention proposes that geosteering carries out minute two sections of controls to target spot since guiding intervention point.First segment is that guiding is situated between
Access point changes to guiding intermediate point according to target zone occurrence, it then follows " hole deviation is most suitable, displacement is minimum uses " principle rationally controls
Hole deviation and displacement usage amount；Second segment is guiding intermediate point to target spot, using stratigraphic marker layer before entering target away from mid-point position, thickness
The features such as degree, stratigraphic dip variation, reasonable employment displacement, Discrete control build angle rate achieve the purpose that accurately to enter target.
The present invention applies more than 110 mouth wells in Middle Yangtze region shale gas well, and hole deviation is suitable, displacement uses reasonable, well
Eye track is round and smooth, enters the control of target angle rationally, and target geological target spot and design geology error are small, and target spot control precision is high, geology
Guide effect is obvious.
Detailed description of the invention
Fig. 1 is workflow block diagram of the present invention；
Fig. 2 is subject-oriented well segmentation scheme figure；
Fig. 3 is guiding intervention point extremely guiding intermediate point control figure；
Fig. 4 is monoclinal stratum vertical depth, displacement and build angle rate matching relationship figure；
Fig. 5 is compound stratum vertical depth, displacement and build angle rate matching relationship figure；
Fig. 6 is that test level well vertical depth, displacement and build angle rate fit into target control example pattern.
Specific embodiment
Referring to Fig.1, specific steps of the invention are as follows:
Step 1: the data preparation stage
1) the regional standard well of subject-oriented horizontal well region is collected, has bored and has led a well and offset well geologic information；
The regional standard well, lead a well, offset well geologic information includes natural gamma, lithology, total hydrocarbon, methane, TOC and ground
Layer individual-layer data and target zone gas show data；
2) subject-oriented well Drilling Design book, including wellblock seismic cross-section, planned course and target spot data are collected；
3) collect the real time data of subject-oriented well, including subject-oriented well guiding intervention point top with bore real-time lithology data,
Gas measured data, hole deviation data and with bore gamma data；
The gas measured data includes when boring, total hydrocarbon and methane；
The hole deviation data includes well depth, hole angle, azimuth, vertical depth, projection displacement, north-south component, thing component, closes
Close away from and rate of over-all angle change.
4) guiding standard well is determined, with reference to well according to data before boring；
Guiding standard well, the equivalent beds position Ying Qiquan with reference to well, interval of interest cannot lack, and guiding standard well generally selects 1
It is a, with reference to optional 1, well or more.
Guiding standard well selection principle: the neighbouring prospect pit in region, gas testing obtain the development well of high yield, and preferential select leads eye
Well, comparison interval are distributed stable, trajectory of horizontal orientation and the consistent regional standard well of subject-oriented well.
It is described to should be subject-oriented well offset well with reference to well, 4 times no more than horizontal section length of well spacing.
Step 2: determining guiding intervention point, the guiding intermediate point of subject-oriented well
1) guiding intervention point is determined
According to guiding standard well and with reference to well compare, by corresponding target spot, stratum hang down thickness 250m position be determined as
Guiding intervention point, 20 °~30 ° of hole deviation of point of guiding intervention, residual displacement ≮ 400m；
2) guiding intermediate point is determined
Foundation is oriented to standard well and with reference to well comparison, will correspond on target zone target spot, the position of the vertical thickness 100m in stratum is true
It is set to guiding intermediate point, residual displacement ≮ 300m；
Subject-oriented well segmentation scheme is shown in Fig. 2.Curved section is well trajectory line in Fig. 2, and guiding intervention point is to guiding intermediate point
First control section, guiding intermediate point to target spot are the second control section.H, h1, h2, h3 are respectively 250m, 100m, 50m, 100m.
Step 3: control guiding intervention point is extremely oriented to the track of intermediate point (see Fig. 3)
Guiding intervention point is 100m to guiding intermediate point h in Fig. 3, and curved section is driftway trajectory line.
1) control of guiding intervention point to guiding intermediate point follows that hole deviation is most suitable, is displaced minimum using priciple, intermediate point
The angle on track and stratum takes 40 °~45 ° of empirical value, and guiding intervention point reaches γ ° of the hole deviation of guiding intermediate point as follows
It calculates:
γ °=90 °-alpha-beta
In formula, α-target zone designs stratigraphic dip, have a down dip for+°, updip is-°；
β-centre locus of points and stratum angle °；
2) control intervention point is to intermediate point geosteering, and powder is divided to stratum updip, have a down dip two kinds of control models for control；
(1) updip stratum starts since intervention point with build angle rate K, measurement unit for °/m, increasing hole angle creeps into intermediate point, deflecting
Rate is calculated as follows
K=(γ2-γ1)/(h×1.4)
In formula, γ1Guiding intervention point hole deviation °；
γ2It is oriented to intermediate point hole deviation °；
Hang down thickness m on h- guiding intervention point to guiding intermediate point stratum；
(2) have a down dip stratum: since guiding intervention point after angle holding drilling 50m~100m, by above-mentioned build angle rate formula increasing hole angle
Drilling is to guiding intermediate point, and wherein h hangs down thick for beginning increasing hole angle point to stratum between guiding midpoint.
Step 4: guiding intermediate point is chosen to target spot Strata Comparison, determines reference lamina
(1) using subject-oriented well and be oriented to standard well, with reference to well lithology, bore when, gas survey, hole deviation and with bore gamma data
Characteristics of Mutation carries out Strata Comparison, divides from the geosteering reference lamina of guiding intermediate point to target spot and is no less than 4, and has
Certain deposition thickness；Correlation marker layer judges drill bit present position and stratigraphic dip；
The selection principle of the geosteering reference lamina be it is obvious with lithology and with gamma curve feature is bored, in transverse direction point
Cloth is stablized, and is easy to identify.
(2) the reference lamina comparing result divided according to guiding intermediate point to target spot, adjusts in time and modifies former Drilling Design
Target spot.
Step 5: according to reference lamina away from the vertical depth between guiding midpoint, thickness of hanging down, in conjunction with the variation of stratigraphic dip, distribution displacement
With control build angle rate, guidance drill bit and control well track trend are crept into target.
1) guiding intermediate point is to the stable monoclinal stratum of target spot attitude of stratum, acline, according to reference lamina away from guiding
Between put position, thickness reasonable distribution displacement usage amount (see Fig. 4), by table 1 control build angle rate.
The curved section for being oriented to intermediate point to target spot in Fig. 4 is well trajectory line.
1 monoclinal stratum of table is away from guiding intermediate point vertical depth, displacement and build angle rate matching relationship table
In table: h --- stratigraphic marker layer hangs down thick；
2) the guiding intermediate point compound stratum changeable to target spot attitude of stratum, point stratum updip, have a down dip both of which.According to
Reference lamina is away from the vertical depth between guiding midpoint, thickness of hanging down, in conjunction with the variable quantity of stratigraphic dip, distribution displacement, control build angle rate；Ground thickness
Degree, change of pitch angle amount, displacement and build angle rate matching relationship are shown in Fig. 5, table 2.
The curved section for being oriented to intermediate point to target spot in Fig. 5 is well trajectory line.
2 compound stratum stratum of table is away from guiding intermediate point vertical depth, displacement and build angle rate matching relationship table
In table: h --- stratigraphic marker layer hangs down thick；
Construction different parts are walked and since sedimentary micro variation is drawn in the compound stratum changeable to attitude of stratum, including track
The stratum of the local occurrence variation risen；For example,
Updip stratum, change of pitch angle amount is between 1 °~5 °, every build angle rate for increasing by 2 ° of raisings, 0.01 °/m；Change of pitch angle
Amount need to suitably relax the displacement usage amount 0.5h of respective flag layer, 1 ° of 0.01 °/m's of raising of every increase makes between 5 °~10 °
Slope；
Have a down dip stratum, and change of pitch angle amount is between 1 °~5 °, every build angle rate for increasing by 2 ° of reductions, 0.01 °/m；Change of pitch angle
Amount is between 5 °~10 °, every build angle rate for increasing by 1 ° of reduction, 0.01 °/m.
Step 6: reaching target spot
Strata Comparison is carried out according to the 4th step, judges whether drill bit reaches target area, is reached, then enters the 7th step；It does not reach
Then return to the 5th step.
Step 7: entering target control
1) according to the from top to bottom correlation marker layer segment assignments displacement, control build angle rate in order of the 5th step；
2) enter target mode: entering upper target frame when the updip of stratum, control 2 °~3 ° of incision angle；When stratum has a down dip, under
Target frame controls 1 °~2 ° of incision angle.
Step 8: effect assessment
It is executed by wellbore quality target body examination range specifications and rate of over-all angle change performance assessment criteria in geological design.
The present invention is used for Fuling shale gas field, from guiding intervention point to target spot, it is desirable that the full-shape of continuous three measuring points changes
No more than target radius control in 0.25 °/m, vertical direction, target radius controls within 10m rate within 5m, in horizontal direction；?
Under the premise of full-shape variation is qualified, target spot fallen within target body vertical direction 1m, within horizontal direction 2m is outstanding, vertical direction
It is qualified between 1m~5m, horizontal direction 2m~10m, is then unqualified beyond target body range.
Application example
The present invention Middle Yangtze region shale gas well apply more than 110 mouth wells, target zone target spot vertical depth 2500~3600m it
Between, middle target rate 100%, guiding intervention point it is round and smooth to hole trajectory control between target spot, enter target angle control rationally, meet geology and
Engineering demand.
BY184-4HF well purpose of design layer will is stayed in the middle part of system Longma small stream group lower section gas-bearing formation, target spot well depth 3669m, vertical depth
3124m；From well depth 3030m, vertical depth 2858.93m, residual displacement 520m intervention guiding, on the whole in conjunction with purpose of design layer stratum
Incline 2 °~3 °, control hole deviation and build angle rate is matched with well depth 3225m, vertical depth 3009.46m is drilled into guiding intermediate point, displacement uses
Measure 100.66m；Start to intermediate point, choose 4 reference laminas above target spot, guidance drill bit is visited layer drilling to target, passed through
Control reference lamina vertical depth, thickness of hanging down are matched with displacement, build angle rate, are down to 20 ° from 39 ° of updip in drilling strata and are down to 4 °, successfully draw
It leads drill bit and enters target into upper target frame in well depth 3672, vertical depth 3110m, enter 92 ° of target hole angle, 2 ° of incision angle, be displaced usage amount
411.26m, guiding intervention point to build angle rate average value 0.11/m between target spot, well track is round and smooth, enter target angle control rationally (see
Fig. 6), it rationally passes through and lays a good foundation for subsequent horizontal section track.Target spot vertical depth moves up 14.00m, geosteering compared with design
Effect is obvious.
Claims (5)
1. shale gas horizontal well enters method for controlling trajectory before target with geosteering is bored, it is characterised in that: specific step is as follows:
Step 1: the data preparation stage
1) the regional standard well of subject-oriented horizontal well region is collected, has bored and has led a well and offset well geologic information；
The brill of the subject-oriented horizontal well region leads a well, offset well geologic information include natural gamma, lithology, total hydrocarbon,
Methane, TOC and oil testing result；
2) subject-oriented horizontal wells book is collected, there is wellblock seismic cross-section, planned course and target spot data；
3) real time data of the subject-oriented well of collection needs driftway guiding intervention point top with the real-time lithology data of brill, gas and surveys number
According to, hole deviation data and with boring gamma data；
4) guiding standard well is determined, with reference to well according to data before boring；
Step 2: determining guiding intervention point, the guiding intermediate point of subject-oriented horizontal well
1) guiding intervention point is determined
It is compared according to guiding standard well and with reference to well, by designed by first step step 2), on corresponding target spot, stratum hangs down thickness
The position of 250m is determined as guiding intervention point, 20 °~30 ° of hole deviation of guiding intervention, residual displacement ≮ 400m；
2) guiding intermediate point is determined
It is compared according to guiding standard well and with reference to well, by designed by first step step 2), on corresponding target spot, stratum hangs down thickness
The position of 100m is determined as being oriented to intermediate point, residual displacement ≮ 300m；
Step 3: control guiding intervention point is extremely oriented to the track of intermediate point
1) control guiding intervention point is to the track for being oriented to intermediate point, and 40 °~45 ° of angle of the intermediate locus of points and stratum, guiding is situated between
γ ° of hole deviation of access point to guiding intermediate point is calculated as follows:
γ °=90 °-alpha-beta
In formula, α-target zone designs stratigraphic dip, have a down dip for+°, updip is-°；
β-centre locus of points and stratum angle °；
2) control guiding intervention point is to the track for being oriented to intermediate point, and control point stratum updip, have a down dip both of which；
(1) updip stratum is intervened point since guiding and is started with build angle rate K, and K measurement unit is °/m, and increasing hole angle is crept into guiding
Point；Build angle rate is calculated as follows
K=(γ2-γ1)/(h×1.4)
In formula, γ1Guiding intervention point hole deviation °；
γ2It is oriented to intermediate point hole deviation °；
Hang down thickness m on h- guiding intervention point to guiding intermediate point stratum；
(2) have a down dip stratum: since guiding intervention point after angle holding drilling 50m~100m, by step (1) build angle rate in step 2)
Formula increasing hole angle is crept into guiding intermediate point, and wherein h hangs down thick for beginning increasing hole angle point to stratum between guiding midpoint；
Step 4: guiding intermediate point is chosen to target spot Strata Comparison, determines reference lamina
1) using subject-oriented horizontal well region subject-oriented well and guiding standard well, with reference to well lithology, bore when, gas survey,
Hole deviation and with bore gamma data Characteristics of Mutation, carry out Strata Comparison, divide from guiding intermediate point to target spot geosteering mark
Layer, correlation marker layer judge drill bit present position and stratigraphic dip；
2) the reference lamina comparing result divided according to guiding intermediate point to target spot, adjusts in time and modifies former Drilling Design target spot；
Step 5: according to reference lamina away from the vertical depth between guiding midpoint, thickness of hanging down, in conjunction with the variation of stratigraphic dip, distribution displacement, control
Build angle rate, guidance drill bit and control well track trend, creep into target；
1) guiding intermediate point is to the stable monoclinal stratum of target spot attitude of stratum, acline, according to reference lamina away from guiding intermediate point
Position, thickness reasonable distribution are displaced usage amount, control build angle rate；
2) the guiding intermediate point compound stratum changeable to target spot attitude of stratum, point stratum updip, have a down dip both of which, according to mark
Layer is away from the vertical depth between guiding midpoint, thickness of hanging down, in conjunction with the variable quantity of stratigraphic dip, distribution displacement, control build angle rate；
Step 6: reaching target spot
According to the Strata Comparison that the 4th step carries out, judge whether drill bit reaches target area, reaches and then enter the 7th step；It does not reach, returns
Return the 5th step；
Step 7: entering target control
1) according to the from top to bottom correlation marker layer segment assignments displacement, control build angle rate in order of the 5th step；
2) enter target mode: entering upper target frame when the updip of stratum, control 2 °~3 ° of incision angle；When stratum has a down dip, into lower target frame,
1 °~2 ° of incision angle of control；
Step 8: effect assessment
It is evaluated by the horizontal wellbore quality target body examination range specifications of shale gas in geological design and rate of over-all angle change.
2. shale gas horizontal well according to claim 1 enters method for controlling trajectory before target with geosteering is bored, feature exists
In the first step 3) described in gas measured data include when boring, total hydrocarbon and methane；
The hole deviation data include well depth, hole angle, azimuth, vertical depth, projection displacement, north-south component, thing component, closure away from
And rate of over-all angle change.
3. shale gas horizontal well according to claim 1 enters method for controlling trajectory before target with geosteering is bored, feature exists
In the first step 4) in guiding standard well, the equivalent beds position Ying Qiquan with reference to well, interval of interest cannot lack, and guiding standard well selects 1
It is a, 1 or more is selected with reference to well；
Guiding standard well selection principle: the neighbouring prospect pit in region, gas testing obtain the development well of high yield, and a well, comparison are led in selection
Interval is distributed stable, trajectory of horizontal orientation and the consistent regional standard well of subject-oriented well；
It is subject-oriented well offset well, 4 times no more than horizontal section length of well spacing with reference to well.
4. shale gas horizontal well according to claim 1 enters method for controlling trajectory before target with geosteering is bored, feature exists
In the 4th step 1) in divide from the geosteering reference lamina of guiding intermediate point to target spot and be no less than 4.
5. shale gas horizontal well according to claim 1 enters method for controlling trajectory before target with geosteering is bored, feature exists
In the 5th step 2) in the compound stratum changeable to attitude of stratum, including track walks construction different parts and due to sedimentary micro
The divided updip stratum in stratum of local occurrence variation caused by variation, have a down dip stratum:
Updip stratum, change of pitch angle amount is between 1 °~5 °, every build angle rate for increasing by 2 ° of raisings, 0.01 °/m；Change of pitch angle amount exists
Between 5 °~10 °, it need to suitably relax the displacement usage amount 0.5h of respective flag layer, every build angle rate for increasing by 1 ° of raising, 0.01 °/m；
Have a down dip stratum, and change of pitch angle amount is between 1 °~5 °, every build angle rate for increasing by 2 ° of reductions, 0.01 °/m；Change of pitch angle amount exists
Between 5 °~10 °, every build angle rate for increasing by 1 ° of reduction, 0.01 °/m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810123707.XA CN108316859B (en) | 2018-02-07 | 2018-02-07 | Shale gas horizontal well enters method for controlling trajectory before target with geosteering is bored |
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| CN110821403A (en) * | 2019-10-25 | 2020-02-21 | 中国石油天然气股份有限公司大港油田分公司 | Drilling trajectory control method and device and storage medium |
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| WO2020109890A1 (en) * | 2018-11-28 | 2020-06-04 | Chevron Usa Inc. | System and method for automated post-geosteering |
| CN109812256A (en) * | 2019-03-28 | 2019-05-28 | 陕西延长石油(集团)有限责任公司研究院 | A kind of horizontal well well structure and boring method for hyposmosis shallow oil reservoir |
| CN112983275B (en) * | 2021-03-09 | 2023-01-24 | 中国石油化工股份有限公司 | Shale gas horizontal well continuous fluctuation type reservoir horizontal section geosteering trajectory control method |
| CN116773771B (en) * | 2023-05-29 | 2024-02-02 | 中国地质调查局油气资源调查中心 | Shale oil evaluation parameter calculation standard determination method and device and electronic equipment |
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| CN105464592A (en) * | 2015-03-31 | 2016-04-06 | 中国石油化工股份有限公司江汉油田分公司勘探开发研究院 | Shale gas horizontal well geosteering method |
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