CN106869792A - Coal bed gas horizontal well horizontal segment goes out the method that selection chases after layer or sidetracking after layer - Google Patents
Coal bed gas horizontal well horizontal segment goes out the method that selection chases after layer or sidetracking after layer Download PDFInfo
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- CN106869792A CN106869792A CN201710241944.1A CN201710241944A CN106869792A CN 106869792 A CN106869792 A CN 106869792A CN 201710241944 A CN201710241944 A CN 201710241944A CN 106869792 A CN106869792 A CN 106869792A
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- 239000003245 coal Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005553 drilling Methods 0.000 claims abstract description 28
- NCGICGYLBXGBGN-UHFFFAOYSA-N 3-morpholin-4-yl-1-oxa-3-azonia-2-azanidacyclopent-3-en-5-imine;hydrochloride Chemical compound Cl.[N-]1OC(=N)C=[N+]1N1CCOCC1 NCGICGYLBXGBGN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 241001074085 Scophthalmus aquosus Species 0.000 claims abstract description 12
- 150000001875 compounds Chemical class 0.000 claims abstract description 6
- 239000004575 stone Substances 0.000 claims description 6
- 238000010276 construction Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Classifications
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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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Abstract
Go out after layer the method for selecting to chase after layer or sidetracking the invention discloses a kind of coal bed gas horizontal well horizontal segment, specially：Calculating chases after layer required time TChase after：TChase after=10 × (alpha+beta) × TIt is fixed/b+5×sin1°×(α2+α×b)×TIt is multiple/(b×sinβ)+10×(α+β)×TConnect/(b×h)+5×sin1°×(α2+α×b)×TConnectIn/(b × h × sin β) formulas：TIt is fixedFor directional drilling average brill when；TIt is multipleIt is compound when chasing after that interval drilling is average to bore；TConnectTo make up a joint drilling rod and deviational survey average time every time；α is a layer angular difference；β is the reverse angular difference for after layer to chase after layer；B is the maximum rate of deviation that coal seam horizontal segment is allowed per 10m；H is the length of single drill pipe；2) according to Sidetracking and drilling tool situation, T the time required to calculating sidetrackingSide；Work as TChase after＜ TSideWhen, selection chases after layer；Otherwise selection sidetracking.The method is calculated to estimate and chases after a layer duration using formula, and it is compared with the duration needed for the sidetracking time, and arrangement and method for construction is walked under reasonable selection.
Description
Technical field
The invention belongs to cbm development field, and in particular to selection chases after layer after a kind of coal bed gas horizontal well horizontal segment goes out layer
Or the method for sidetracking.
Background technology
In current coal bed gas horizontal well drilling operation course, general upper gamma and lower gamma according to instrument measurement while drilling is poor
Value (EM-MWD) or deep and shallow resistivity difference (LWD) etc. judge the relation of drill bit and coal seam, using data point reuses such as hole deviation, orientation
Well track, realizes that well track accurately follows the trail of coal seam.But apparatus measures generally there are very big blind area, offset well data lacks in addition
The factor such as weary, seismic data precision shortcoming, geological structure be complicated and changeable, causes to ensure track all the time in coal seam in construction
Walk, now just in the presence of adjustment track chase after layer or return the dilemma of certain position sidetracking again.
In horizontal segment construction, after layer is gone out, layer or direct sidetracking are either directly chased after, may be because selecting improper and volume
Outer increase drilling period, wastes drilling cost, reduces coal seam Drilling ratio, in addition because blindness chases after layer and caused by drilling risk, mesh
Preceding is generally artificial micro-judgment in work progress, lacks reproducibility.
The content of the invention
In order to solve the above-mentioned technical problem, the present invention provide a kind of coal bed gas horizontal well horizontal segment go out selection after layer chase after layer or
The method of sidetracking, estimates using formula calculating and chases after a layer duration, it is compared with the duration needed for the sidetracking time, under reasonable selection
Step arrangement and method for construction.
Therefore, technical scheme is as follows：
A kind of coal bed gas horizontal well horizontal segment goes out the method that selection chases after layer or sidetracking after layer, comprises the following steps：
1) T the time required to chasing after layer is calculated using equation belowChase after：
TChase after=TIt is fixed′+TIt is multiple′+TConnect′
=10 × (alpha+beta) × TIt is fixed/b+5×sin1°×(α2+α×b)×TIt is multiple/(b×sinβ)+10×(α+β)×TConnect/(b
×h)+5×sin1°×(α2+α×b)×TConnect/(b×h×sinβ)
In formula：TIt is fixed' for orientation adjustment section needed for brill when；TIt is fixedIt is current well section in mud stone during the average brill of directional drilling；
TIt is multiple' for it is compound chase after interval needed for brill when；TIt is multipleIt is combined in mud stone for current well section when chasing after that interval drilling is average to bore；
TConnect' it is layer to returning interval because of drilling rod and the deviational survey required time altogether that makes up a joint；TConnectFor every time make up a joint drilling rod and
Deviational survey average time；
α is a layer angular difference, is positive number；β is the reverse angular difference for after layer to chase after layer, is positive number；B is coal seam horizontal segment per 10m
(in order to resolve conveniently, the maximum hole deviation that b can also take coal seam horizontal segment and be allowed per specific rice becomes for the maximum rate of deviation of permission
Rate)；H is the length of single drill pipe；
2) required according to Sidetracking, crept into when former meters of sidetracking need to be controlled, required during according to control, calculate the sidetracking in coal seam
T the time required to successSide；Compare TChase afterWith TSide,
Work as TChase after＜ TSideWhen, selection chases after layer；
Work as TChase after＞ TSideWhen, select sidetracking.
Further, β=3~4 °.
Further, b=2.5~3.5.
The technical scheme efficiently solves the problems, such as that selection chases after layer or sidetracking after horizontal segment goes out layer, effectively prevent and chases after
Layer partway occurs that complex working condition, footage unpayable are excessive, loses time long and select sidetracking again, even and if after returning layer,
Because track is of poor quality, the later stage such as cannot construct at the phenomenon.
Brief description of the drawings
Fig. 1 is ejection coal seam extremely time layer track adjustment curve synoptic diagram in specific embodiment.
In figure：1 is schematic diagram geometric locus, and 2 is schematic diagram roof, and 3 is schematic diagram seat earth, and E is schematic diagram
Track goes out a layer point, and F ' is that coal seam solstics is deviateed in track, and E ' is that hole deviation adjusts end point, and F is that schematic diagram track enters a layer point, and α is
Schematic diagram goes out a layer angular difference, and β is time layer angular difference to chase after a layer angular difference, also.
Specific embodiment
Technical scheme is described in detail below in conjunction with the drawings and specific embodiments.
As shown in figure 1, a kind of coal bed gas horizontal well horizontal segment goes out the method that selection chases after layer or sidetracking after layer, including following step
Suddenly：
1) according to brill and offset well data, a layer direction is determined, calculates a layer angular difference α；Go out after layer and chased after with reverse angular difference β
Layer；Go out the difference that layer angular difference α is hole angle and stratigraphic dip when layer；It is preferred that, β=3~4 °, when this is implemented, from β=
3°；
The maximum rate of deviation that note coal seam horizontal segment is allowed per 10m is b；Hole deviation is adjusted to needed for reverse angular difference β
Chi, that is, orient adjustment section, and note orientation adjustment segment length is EE ', EE '=10 × (alpha+beta)/b；It is preferred that, b=2.5~3.5, at this
During secondary implementation, from b=3；
Remember that current well section is T during the average brill of directional drilling in mud stoneIt is fixed, T when calculating brill needed for orientation adjustment sectionIt is fixed′
For：
TIt is fixed'=EE ' × TIt is fixed
=10 × (alpha+beta) × TIt is fixed/b
2) hole deviation is adjusted to stratigraphic dip when identical (i.e. the F ' of Fig. 1), the ultimate range that coal seam is deviateed in track is designated as
H；
H=5 × sin1 ° × (α2+α×b)/b
Note：The computational methods of H are：
For 10 × sin1 ° × α, (when deviateing 1 °, coal is deviateed in 10m tracks to first vertical height in 10 meter-gage marks deviation coal seam
Layer vertical height be 10 × sin1 °), second 10 meters deviate coal seams hang down thickness be 10 × sin1 ° × (α-b), then (n+1)th 10
Rice deviate coal seam hang down thickness be 10 × sin1 ° × (α-b × n)
Therefore, at n+1 10 meters, track is always deviateed the vertical thickness in coal seam and is：
H '=10 × sin1 ° × α+10 × sin1 ° × (α-b)+...+10 × sin1 ° × (α-b × n)
=10 × sin1 ° × (n+1) × (2 α-b × n)/2
When hole deviation adjust to it is identical with stratigraphic dip when, α-b × n=0
Then n=α/b
N=α/b are substituted into H ', draw when hole deviation adjust to it is identical with stratigraphic dip when track deviate coal seam and hang down thickness H：
H=5 × sin1 ° × (α2+α×b)/b
3) when drilling trace is adjusted to reverse angular difference β hold angle compound drillings, until returning drilling depth needed for layer, that is, it is combined and chases after layer
Section, the compound interval length that chases after of note is for EF '；
E ' F=H/sin β
=5 × sin1 ° × (α2+α×b)/(b×sinβ)
Remember that current well section is combined in mud stone and chase after T when interval drilling is averagely boredIt is multiple, calculate and be combined T when chasing after brill needed for intervalIt is multiple′：
TIt is multiple'=E ' F × TIt is multiple
=5 × sin1 ° × (α2+α×b)×TIt is multiple/(b×sinβ)
4) according to orientation adjustment section and it is compound chase after interval needed for total footage, reckoning need to make up a joint drilling rod number of times and midway deviational survey
Number of times is：
(EE′+E′F)/h
=(10 × (alpha+beta)/b+5 × sin1 ° × (α2+α×b)/(b×sinβ)〕/h
=10 × (alpha+beta)/(b × h)+5 × sin1 ° × (α2+α×b)/(b×h×sinβ)
Wherein, h is the length of single drill pipe；
According to on-site actual situations, make up a joint every time drilling rod and deviational survey average time T are takenConnect, calculate layer to return interval because
Make up a joint with deviational survey altogether the time required to TConnect′：
TConnect'=(EE '+E ' F) × TConnect′/h
=10 × (alpha+beta) × TConnect/(b×h)+5×sin1°×(α2+α×b)×TConnect/(b×h×sinβ)
5) calculate the time required to chasing after layer：
TChase after=TIt is fixed′+TIt is multiple′+TConnect′
=10 × (alpha+beta) × TIt is fixed/b+5×sin1°×(α2+α×b)×TIt is multiple/(b×sinβ)+10×(α+β)×TConnect/(b
×h)+5×sin1°×(α2+α×b)×TConnect/(b×h×sinβ)
According to Sidetracking require, when former meters of sidetracking need to be controlled creep into, according to control when require, calculate in coal seam sidetracking into
T the time required to work(Side；
Work as TChase after＜ TSideWhen, selection chases after layer；
Work as TChase after＞ TSideWhen, select sidetracking.
When considering that selection sidetracking still chases after brill, also need to consider interval to coal seam drilling depth, coal seam Drilling ratio, drilling well
Subsequent construction, the influence of other operations of later stage；The method that the present invention is provided only is the simple result considered from time angle, but
This method judges to provide basis for quick, accurate.
Claims (3)
1. a kind of coal bed gas horizontal well horizontal segment goes out the method that selection chases after layer or sidetracking after layer, it is characterised in that including following step
Suddenly：
1) T the time required to chasing after layer is calculated using equation belowChase after：
TChase after=TIt is fixed′+TIt is multiple′+TConnect′
=10 × (alpha+beta) × TIt is fixed/b+5×sin1°×(α2+α×b)×TIt is multiple/(b×sinβ)+10×(α+β)×TConnect/(b×h)+5
×sin1°×(α2+α×b)×TConnect/(b×h×sinβ)
In formula：TIt is fixed' for orientation adjustment section needed for brill when；TIt is fixedIt is current well section in mud stone during the average brill of directional drilling；
TIt is multiple' for it is compound chase after interval needed for brill when；TIt is multipleIt is combined in mud stone for current well section when chasing after that interval drilling is average to bore；
TConnect' it is layer to returning interval because of drilling rod and the deviational survey required time altogether that makes up a joint；TConnectIt is drilling rod and the deviational survey of making up a joint every time
Average time；
α is a layer angular difference；β is the reverse angular difference for after layer to chase after layer；B is that the maximum hole deviation that coal seam horizontal segment is allowed per 10m changes
Rate；H is the length of single drill pipe；
2) required according to Sidetracking, crept into when former meters of sidetracking need to be controlled, required during according to control, calculate the sidetracking success in coal seam
Required time TSide；Compare TChase afterWith TSide,
Work as TChase after＜ TSideWhen, selection chases after layer；
Work as TChase after＞ TSideWhen, select sidetracking.
2. coal bed gas horizontal well horizontal segment as claimed in claim 1 goes out the method that selection chases after layer or sidetracking after layer, it is characterised in that：
β=3~4 °.
3. coal bed gas horizontal well horizontal segment as claimed in claim 1 goes out the method that selection chases after layer or sidetracking after layer, it is characterised in that：
B=2.5~3.5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710241944.1A CN106869792B (en) | 2017-04-14 | 2017-04-14 | Coal bed gas horizontal well horizontal segment selects the method for chasing after layer or sidetracking after going out layer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710241944.1A CN106869792B (en) | 2017-04-14 | 2017-04-14 | Coal bed gas horizontal well horizontal segment selects the method for chasing after layer or sidetracking after going out layer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110805396A (en) * | 2018-08-03 | 2020-02-18 | 中国石油天然气股份有限公司 | Drilling track control method for horizontal well of thin sandstone oil and gas reservoir |
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|---|---|---|---|---|
| US4715452A (en) * | 1985-01-08 | 1987-12-29 | Prad Research And Development Nv | Method of drilling a directonal well bore |
| US4938298A (en) * | 1989-02-24 | 1990-07-03 | Becfield Horizontal Drilling Services Company | Directional well control |
| US20120292111A1 (en) * | 2004-10-28 | 2012-11-22 | Williams Danny T | Formation Dip Geo-Steering Method |
| CN103867180A (en) * | 2013-09-11 | 2014-06-18 | 华北石油管理局 | Coal bed gas horizontal well track control method |
| CN104314560A (en) * | 2014-08-26 | 2015-01-28 | 中国石油天然气股份有限公司 | Comparing method and comparing device for non-proportional stratum before window entering of horizontal well |
| CN104481400A (en) * | 2014-12-10 | 2015-04-01 | 中国石油化工股份有限公司 | Three-dimensional (3D) horizontal well borehole track controlling method |
| CN105781417A (en) * | 2016-03-14 | 2016-07-20 | 中国石油天然气股份有限公司 | Method and device for obtaining entrance window angle of horizontal well |
-
2017
- 2017-04-14 CN CN201710241944.1A patent/CN106869792B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4715452A (en) * | 1985-01-08 | 1987-12-29 | Prad Research And Development Nv | Method of drilling a directonal well bore |
| US4938298A (en) * | 1989-02-24 | 1990-07-03 | Becfield Horizontal Drilling Services Company | Directional well control |
| US20120292111A1 (en) * | 2004-10-28 | 2012-11-22 | Williams Danny T | Formation Dip Geo-Steering Method |
| CN103867180A (en) * | 2013-09-11 | 2014-06-18 | 华北石油管理局 | Coal bed gas horizontal well track control method |
| CN104314560A (en) * | 2014-08-26 | 2015-01-28 | 中国石油天然气股份有限公司 | Comparing method and comparing device for non-proportional stratum before window entering of horizontal well |
| CN104481400A (en) * | 2014-12-10 | 2015-04-01 | 中国石油化工股份有限公司 | Three-dimensional (3D) horizontal well borehole track controlling method |
| CN105781417A (en) * | 2016-03-14 | 2016-07-20 | 中国石油天然气股份有限公司 | Method and device for obtaining entrance window angle of horizontal well |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110805396A (en) * | 2018-08-03 | 2020-02-18 | 中国石油天然气股份有限公司 | Drilling track control method for horizontal well of thin sandstone oil and gas reservoir |
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