CN106869792B - Coal bed gas horizontal well horizontal segment selects the method for chasing after layer or sidetracking after going out layer - Google Patents
Coal bed gas horizontal well horizontal segment selects the method for chasing after layer or sidetracking after going out layer Download PDFInfo
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- CN106869792B CN106869792B CN201710241944.1A CN201710241944A CN106869792B CN 106869792 B CN106869792 B CN 106869792B CN 201710241944 A CN201710241944 A CN 201710241944A CN 106869792 B CN106869792 B CN 106869792B
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- 239000003245 coal Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 16
- 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
- 150000001875 compounds Chemical class 0.000 claims abstract description 11
- 241001074085 Scophthalmus aquosus Species 0.000 claims abstract description 8
- 239000004575 stone Substances 0.000 claims description 6
- 238000010276 construction Methods 0.000 abstract description 6
- 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
- 239000002699 waste material Substances 0.000 description 2
- 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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- Life Sciences & Earth Sciences (AREA)
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of coal bed gas horizontal well horizontal segments to go out the method for selecting to chase after layer or sidetracking after layer, specially：Calculating chases after T the time required to layerIt chases after：TIt chases after=10 × (alpha+beta) × TIt is fixed/b+5×sin1°×(α2+α×b)×TIt is multiple/(b×sinβ)+10×(α+β)×TIt connects/(b×h)+5×sin1°×(α2+α×b)×TIt connectsIn/(b × h × sin β) formulas：TIt is fixedFor directional drilling average brill when；TIt is multipleThe compound interval drilling that chases after is when averagely boring；TIt connectsFor drilling rod and the deviational survey average time of making up a joint every time；α is a layer angular difference；β is the reversed angular difference that layer is chased after after layer；B is the maximum rate of deviation that coal seam horizontal segment allows per 10m；H is the length of single drill pipe；2) according to Sidetracking and drilling tool situation, T the time required to sidetracking is calculatedSide；Work as TIt chases after＜ TSideWhen, selection chases after layer；Otherwise selection sidetracking.This method is estimated using formula calculating and chases after a layer duration, by its with the sidetracking time needed for the duration compare, reasonably select and lower walk arrangement and method for construction.
Description
Technical field
The invention belongs to cbm development fields, 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
It is general poor according to the upper gamma of instrument measurement while drilling and lower gamma at present in coal bed gas horizontal well drilling operation course
Value (EM-MWD) or deep and shallow resistivity difference (LWD) etc. judge the relationship in drill bit and coal seam, utilize the data point reuses such as hole deviation, orientation
Well track realizes that well track accurately tracks coal seam.But generally there are prodigious blind areas, in addition offset well data to lack for apparatus measures
The factors such as weary, seismic data precision is short of, geological structure is complicated and changeable cause not ensureing track always in coal seam in construction
It walks, just chase after layer in the presence of adjustment track at this time or retracts the dilemma of some position sidetracking again.
Horizontal segment construction in, after going out layer, either directly chase after layer or direct sidetracking, may because select it is improper due to volume
Outer increase drilling period wastes drilling cost, reduces coal seam Drilling ratio, or even drilling risk caused by due to blindly chasing after layer, mesh
Preceding is mostly in the construction process artificial micro-judgment, lacks reproducibility.
Invention content
In order to solve the above technical problem, the present invention provides a kind of coal bed gas horizontal well horizontal segment go out selection after layer chase after layer or
The method of sidetracking is estimated using formula calculating and chases after a layer duration, by its with the sidetracking time needed for the duration compare, under reasonable selection
Walk arrangement and method for construction.
For this purpose, technical scheme is as follows：
A kind of coal bed gas horizontal well horizontal segment selects the method for chasing after layer or sidetracking after going out layer, includes the following steps：
1) layer required time T is chased after using the calculating of following formulaIt chases after：
TIt chases after=TIt is fixed′+TIt is multiple′+TIt connects′
=10 × (alpha+beta) × TIt is fixed/b+5×sin1°×(α2+α×b)×TIt is multiple/(b×sinβ)+10×(α+β)×TIt connects/(b
×h)+5×sin1°×(α2+α×b)×TIt connects/(b×h×sinβ)
In formula：TIt is fixedWhen ' brill required for orientation adjustment section；TIt is fixedIt is current well section in mud stone when the average brill of directional drilling；
TIt is multiple' for it is compound chase after bore needed for interval when；TIt is multipleFor current well section in mud stone it is compound chase after interval drilling averagely bore when；
TIt connects' it is layer to returning interval because of drilling rod and the deviational survey required time in total that makes up a joint；TIt connectsFor make up a joint every time drilling rod and
Deviational survey average time；
α is a layer angular difference, is positive number；β is the reversed angular difference that layer is chased after 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 to allow per specific rice becomes for the maximum rate of deviation of permission
Rate)；H is the length of single drill pipe；
2) it is required according to Sidetracking, former meters of sidetracking is crept into when need to control, and is required when according to control, is calculated the sidetracking in coal seam
T the time required to successSide；Compare TIt chases afterWith TSide,
Work as TIt chases after＜ TSideWhen, selection chases after layer；
Work as TIt chases after＞ TSideWhen, select sidetracking.
Further, β=3~4 °.
Further, b=2.5~3.5.
The technical solution solves the problems, such as that selection chases after layer or sidetracking after horizontal segment goes out layer, effectively prevents chasing after
Layer partway occurs that complex working condition, footage unpayable are excessive, waste time long and select sidetracking again, and even if returning layer after,
Because track is of poor quality, phenomena such as later stage can not construct.
Description of the drawings
Fig. 1 is that ejection coal seam adjusts curve synoptic diagram to layer track is gone back in specific implementation mode.
In figure：1 is schematic diagram geometric locus, and 2 be schematic diagram roof, and 3 be schematic diagram seat earth, and E is schematic diagram
Track goes out a layer point, and F ' is that coal seam farthest point 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 to chase after a layer angular difference, is also time layer angular difference.
Specific implementation mode
Technical scheme of the present invention 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 selects the method for chasing after layer or sidetracking after going out layer, including walk as follows
Suddenly：
1) it according to brill and offset well data, determines a layer direction, calculates a layer angular difference α；Go out after layer and is chased after with reversed 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, selection β=
3°；
Remember that the maximum rate of deviation that coal seam horizontal segment allows per 10m is b；By hole deviation adjust to needed for reversed angular difference β into
Ruler orients adjustment section, note orientation adjustment segment length is EE ', EE '=10 × (alpha+beta)/b；It is preferred that b=2.5~3.5, at this
When secondary implementation, b=3 is selected；
Remember that current well section is T when the average brill of directional drilling in mud stoneIt is fixed, calculate T when being bored 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 maximum distance that coal seam is deviateed in track is denoted as
H；
H=5 × sin1 ° × (α2+α×b)/b
Note：The computational methods of H are：
The vertical height that first 10 meter-gage mark deviates coal seam is that (when deviateing 1 °, coal is deviateed in the tracks 10m to 10 × sin1 ° × α
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 always deviates 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 as stratigraphic dip when, α-b × n=0
Then n=α/b
N=α/b are substituted into H ', obtain when hole deviation adjust to it is identical as stratigraphic dip when track deviate coal seam and hang down thickness H：
H=5 × sin1 ° × (α2+α×b)/b
3) until returning drilling depth needed for layer, i.e., compound to chase after layer when drilling trace is adjusted to reversed angular difference β hold angle compound drillings
Section, the compound interval length that chases after of note is EF '；
E ' F=H/sin β
=5 × sin1 ° × (α2+α×b)/(b×sinβ)
Remember that current well section is compound in mud stone and chases after T when interval drilling is averagely boredIt is multiple, calculating is compound to chase after T when being bored 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 total footage needed for interval, reckoning need to make up a joint drilling rod number and midway deviational survey
Number 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 takenIt connects, calculate layer to return interval because
Make up a joint with deviational survey in total the time required to TIt connects′：
TIt connects'=(EE '+E ' F) × TIt connects/h
=10 × (alpha+beta) × TIt connects/(b×h)+5×sin1°×(α2+α×b)×TIt connects/(b×h×sinβ)
5) it calculates the time required to chasing after layer：
TIt chases after=TIt is fixed′+TIt is multiple′+TIt connects′
=10 × (alpha+beta) × TIt is fixed/b+5×sin1°×(α2+α×b)×TIt is multiple/(b×sinβ)+10×(α+β)×TIt connects/(b
×h)+5×sin1°×(α2+α×b)×TIt connects/(b×h×sinβ)
Required according to Sidetracking, former meters of sidetracking is crept into when need to control, according to control when require, calculate in coal seam sidetracking at
T the time required to work(Side；
Work as TIt chases after＜ TSideWhen, selection chases after layer；
Work as TIt chases 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, other operations of later stage influence；Method provided by the invention is only to consider from time angle as a result, still merely
This method provides basis for quick, accurate judgement.
Claims (3)
1. a kind of coal bed gas horizontal well horizontal segment selects the method for chasing after layer or sidetracking after going out layer, it is characterised in that including walking as follows
Suddenly：
1) layer required time T is chased after using the calculating of following formulaIt chases after：
TIt chases after=TIt is fixed′+TIt is multiple′+TIt connects′
=10 × (alpha+beta) × TIt is fixed/b+5×sin1°×(α2+α×b)×TIt is multiple/(b×sinβ)+10×(α+β)×TIt connects/(b×h)
+5×sin1°×(α2+α×b)×TIt connects/(b×h×sinβ)
In formula：TIt is fixedWhen ' brill required for orientation adjustment section；TIt is fixedIt is current well section in mud stone when the average brill of directional drilling；
TIt is multiple' for it is compound chase after bore needed for interval when；TIt is multipleFor current well section in mud stone it is compound chase after interval drilling averagely bore when；
TIt connects' it is layer to returning interval because of drilling rod and the deviational survey required time in total that makes up a joint；TIt connectsFor drilling rod and the deviational survey of making up a joint every time
Average time；
α is a layer angular difference；β is the reversed angular difference that layer is chased after after layer；B is that the maximum hole deviation that coal seam horizontal segment allows per 10m changes
Rate；H is the length of single drill pipe；
2) it is required according to Sidetracking, former meters of sidetracking is crept into when need to control, and is required when according to control, calculates the sidetracking success in coal seam
Required time TSide；Compare TIt chases afterWith TSide,
Work as TIt chases after＜ TSideWhen, selection chases after layer；
Work as TIt chases after＞ TSideWhen, select sidetracking.
2. coal bed gas horizontal well horizontal segment as described in claim 1 selects the method for chasing after layer or sidetracking after going out layer, it is characterised in that：
β=3~4 °.
3. coal bed gas horizontal well horizontal segment as described in claim 1 selects the method for chasing after layer or sidetracking after going out layer, it is characterised in that：
B=2.5~3.5.
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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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| 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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| CN106869792B true CN106869792B (en) | 2018-10-19 |
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| CN110805396B (en) * | 2018-08-03 | 2021-07-02 | 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 |
Citations (6)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7191850B2 (en) * | 2004-10-28 | 2007-03-20 | Williams Danny T | Formation dip geo-steering method |
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2017
- 2017-04-14 CN CN201710241944.1A patent/CN106869792B/en not_active Expired - Fee Related
Patent Citations (6)
| 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 |
| 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 |
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