CN101476463B - Drill-following natural gamma geosteering method for horizontal well - Google Patents
Drill-following natural gamma geosteering method for horizontal well Download PDFInfo
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Abstract
The invention discloses a geosteering method for horizontal well while drilling natural gamma. The method comprises the following steps that: I, when a level driller drills, a gamma detector detects natural gamma rays in the drilled stratum in real time, and well recording equipment transmits the measured well incline angle 1 and well depth data 1 to a data acquiring, analyzing and processing system in real time; II, the data acquiring, analyzing and processing system makes a while drilling gamma graph and correspondingly judges the drilling-in and drilling-out trend of a drill bit: 1, makinga symmetry and balance line and 2, judging whether the gamma ray changing graphs on both side areas of the symmetry and balance line have symmetrical sections or not to determine that the drill bit drills out from one stratum and then drills into the same stratum is illuminated or that the drill bit drills out from one stratum and then drills into the adjacent stratum is illuminated correspondingly; and the well depth data of the drill bit position are combined to synthetically judge synchronously, and the drill bit drilling-in direction can be adjusted correspondingly. The method can correctly judge the drilling-in and drilling-out trend of the drill bit, with simple steps, and can effectively solve the problem that the drill bit can reliably pass through the subject stratum.
Description
Technical field
The present invention relates to petroleum drilling exploratory development technical field, especially relate to a kind of drill-following natural gamma geosteering method for horizontal well that is applicable in the horizontal well horizontal segment drilling process.
Background technology
At present; In the petroleum drilling technology field; Generally all use comprehensive logging instrument that whole drilling process is monitored in real time, the distance between this instrument monitoring while drilling point well depth and bit location well depth is zero distance basically, thus at any time at the bottom of the monitor well its formation lithology and oil gas water show situation of change.In the actual well drilled process; In that difference is tiltedly dark, different when boring under the condition; The real-time well logging of comprehensive logging instrument shows that landwaste content of mudstone and oil gas water change situation; Landwaste content of mudstone and the gas survey data passing through to be demonstrated can in time be judged the lithology that the bit drills chance is different from zone of interest, simultaneously according to measured hole deviation angle and prediction locus, can judge drill bit and whether get out zone of interest.
According to discovering, following 6 kinds of situation can appear when drill bit is walked in horizontal segment, and relevant parameter and data are reacted as follows:
1, when drill bit when last country rock gets into gas-bearing formation: descend during brill; The landwaste percentage composition: the mud stone landwaste reduces, and cloud rock landwaste increases; The total hydrocarbon value rises; The measurement while drilling hole deviation increases, and vertical depth increases, and natural gamma becomes low value by the high value.
2, when drill bit when gas-bearing formation gets into down country rock: rise during brill; The landwaste percentage composition: mud stone landwaste content increases, and cloud rock landwaste reduces; The total hydrocarbon value descends; The measurement while drilling hole deviation, vertical depth increases, and gamma ray curve becomes high value by low value.
3, when drill bit gets into gas-bearing formation from descending country rock: descend during brill; The landwaste percentage composition: the mud stone landwaste reduces, and cloud rock landwaste increases; The total hydrocarbon value rises; The measurement while drilling hole deviation increases, and vertical depth increases, and natural gamma becomes low value by the high value.
4, when drill bit when gas-bearing formation get into to be gone up country rock: rise during brill; The landwaste percentage composition: mud stone landwaste content increases, and cloud rock landwaste reduces; The total hydrocarbon value descends; The measurement while drilling hole deviation, vertical depth increases, and gamma ray curve becomes high value by low value.
5, when drill bit creeps in country rock: continue high relatively value during brill; Lithology is single mud stone; The total hydrocarbon value is a low value; Natural gamma is high value.
6, when drill bit creeps in gas-bearing formation: continue relative low value during brill; Lithology is single sandstone; The total hydrocarbon value is high value; Natural gamma is a low value.
To sum up, in horizontal drilling process, the parameter of acquisition and data have a lot, mainly comprise when boring, gas survey, landwaste, hole deviation and natural gamma and other engineering parameter.The combinatory analysis of any several kinds of data can realize the well logging guiding to horizontal segment.The site mud logging data has real-time, immediately following drill bit.And gamma ray curve is well declared the lithology of having known drilling strata.The hole deviation data become map analysis to annotate bit trajectory preferably.Gas survey numerical value variation reaction to a certain degree the quality of formation gas bearing degree.To the difficult point of above geosteering, the response feature of aggregate data and parameter comes analyzing total to bear the effective guidance method that can guarantee that the horizontal segment drill bit creeps into by predetermined direction.
But in level is crept into, the situation that drill bit got out and pierced zone of interest often occurs, the stratum can duplicate phenomenon on section.Simultaneously; Along with the increase of horizontal shift, zone of interest has flexural deformation in various degree in the horizontal, utilizes vertical depth to convert to describe the form of natural gamma can not represent zone of interest gamma ray curve characteristic; That is to say that log data has lost reference value; It is very big that the complicacy of location of living in addition physical environment and landform, above-mentioned factor make geosteering implement difficulty, caused great challenge for on-the-spot supervision.In sum, because horizontal well well logging scene receives many factor affecting, therefore the uncertainty of subsurface formations in actual well logging process, needs integrated application the whole bag of tricks and technology analysis to declare knowledge in addition.In addition, also need develop a kind of drill bit is pierced and gets out to declare know and guarantee effective guiding way that drill bit is reliably walked at objective interval.
Summary of the invention
Technical matters to be solved by this invention is to above-mentioned deficiency of the prior art; A kind of drill-following natural gamma geosteering method for horizontal well is provided; It can pierce and get out accurately to declare to know and declare to drill bit knows that method step is simple, operation is simple and easy, effective; Can effectively solve reliably the walk problem of drill bit, especially under the situation of existing log data distortion at objective interval.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of drill-following natural gamma geosteering method for horizontal well is characterized in that this method may further comprise the steps:
(1) make the symmetrical balance line: said with boring the many symmetrical balance lines that draw among the gamma curve figure; Corresponding tiltedly dark dividing line when said symmetrical balance line is one=90 ° of a hole deviation angle, said many symmetrical balance lines will saidly be divided into a plurality of zones with brill gamma curve figure;
(2) be axis of symmetry with said symmetrical balance line, judge whether the gamma ray change curve of said symmetrical balance line two side areas exists symmetric sections;
When there is symmetric sections in the gamma ray change curve of said symmetrical balance line both sides, explains after said drill bit gets out from a stratum and bore go back to same stratum again; When there is not symmetric sections in the gamma change curve of said symmetrical balance line both sides, explain that said drill bit continues to creep into or to get out continued from a stratum to the bottom on a stratum or top to creep into to adjacent stratum;
(3) combine the hole deviation angle two of said drill bit and the well depth data two of said drill bit present position simultaneously; To the drilling direction of said drill bit with specifically creep into the position and comprehensively judge; After promptly getting out, the trend that gets out after whether said drill bit gets out and get out from zone of interest from zone of interest finally judged creeps into which stratum adjacent with zone of interest; According to the said analysis and judgement result who gets out trend the drilling direction of said drill bit is adjusted accordingly again, after the adjustment the more said drill bit of real-time judge whether bore back zone of interest;
Said hole deviation angle two and well depth data two are in real time the distance B between detected hole deviation angle one and well depth data one and well logging equipment detection device thereof and said drill bit to be calculated according to well logging equipment to draw.
Distance between gamma detector described in the step 1 and the said drill bit end is 7-15m.
When there is symmetric sections in the gamma ray change curve when said symmetrical balance line both sides described in the step (two); Therein a symmetric sections subscript one monumented point A and simultaneously with another symmetric sections of this symmetric sections symmetry on find out the symmetric flag point A ' with said monumented point A symmetry; The repetition appearance point that said symmetric flag point A ' is said monumented point A is according to formula
Can calculate the inclination alpha on stratum, said monumented point A and symmetric flag point A ' place, h in the formula
Vertical depthAnd h
Tiltedly darkIt is dark with tiltedly to be respectively the corresponding vertical depth in said monumented point A present position, h '
Vertical depthAnd h '
Tiltedly darkIt is dark with tiltedly to be respectively the corresponding vertical depth in said symmetric flag point A ' present position;
During the drilling direction of said drill bit is adjusted accordingly described in the step (three),, the drilling direction of said drill bit is adjusted in conjunction with said inclination alpha according to the said analysis and judgement result who gets out trend.
Described in the step (three) to the drilling direction of said drill bit and specifically creep into the position when comprehensively judging, when said hole deviation angle two during, explain that said drill bit upwards creeps into greater than 90 °; When said hole deviation angle two during, explain that said drill bit creeps into downwards less than 90 °;
When hole deviation angle two increases gradually, explain that said drill bit is in the increasing hole angle state; When hole deviation angle two reduces gradually, explain that said drill bit is in the drop angle state; Stablize when constant when hole deviation angle two, explain that said drill bit is in the hold angle state.
The present invention compared with prior art has the following advantages: 1, the simple and realization convenience of the used hardware device of the present invention.2, the present invention can pierce and get out accurately to declare to know and declare and know that method step is simple, operation is simple and easy drill bit; In level is crept into; The present invention can carry out accurate identification to the situation that the rig drill bit got out and pierced zone of interest; Combine hole deviation angle situation of change simultaneously; Can reliably hold creep into the get out trend of drill bit in the horizontal drilling process in zone of interest, effectively avoid in horizontal drilling process, utilize vertical depth to convert to describe the form of natural gamma can not represent zone of interest gamma ray curve characteristic along with horizontal shift increases; Especially lose reference value at log data; Geosteering that series of factors such as regional down-hole of living in addition geological condition complicacy are brought is implemented the great problem of difficulty, powerful guarantee is provided for on-the-spot aboveground geosteering, guarantees that finally drill bit reliably walks at objective interval.3, in the practice, the present invention declares knowledge through combining with other geosteering method to the overall process analysis that drill bit creeps into.In sum; The present invention can effectively solve now because horizontal well well logging scene receives many factor affecting; The geosteering difficulty is big; On-the-spot supervision is the practical problems of difficulty very, can carry out accurate identification to the trend of creeping into and get out of drill bit in the horizontal drilling process simply and easily through the present invention.
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
Description of drawings
Fig. 1 is the circuit block diagram of the used hardware device of the present invention.
Fig. 2 for data acquisition of the present invention and analysis process system produced with boring gamma curve figure.
Description of reference numerals:
The 1-gamma detector; 2-data acquisition and analysis process system; 3 one well logging equipment;
4-symmetrical balance line one; 5-symmetrical balance line two; 6-symmetrical balance line three.
Embodiment
Like Fig. 1 and shown in Figure 2, drill-following natural gamma horizontal well geosteering method of the present invention may further comprise the steps:
(1) make the symmetrical balance line: said with boring the many symmetrical balance lines that draw among the gamma curve figure; Corresponding tiltedly dark dividing line when said symmetrical balance line is hole deviation angle=90 °, said many symmetrical balance lines will saidly be divided into a plurality of zones with brill gamma curve figure.
In the present embodiment, said with bore gamma curve figure be well depth (referring to tiltedly deeply) from 3630m to the gamma ray change curve the 4630m.Be noted that: before the construction,, should accurately grasp the detailed strata condition of construction well present position earlier according to topographic(al) reconnaissance in early stage analysis result according to the conventional drilling construction technology.When well depth was 3660.5 meters, getting into stratum M1 was zone of interest.
At first make the symmetrical balance line; In the present embodiment; The quantity of said symmetrical balance line is 3; Specifically be said symmetrical balance line 1, symmetrical balance line 25 and symmetrical balance line 36 corresponding when boring that well depth is respectively 3965m, 3815m and 4446m among the gamma curve figure; With above-mentioned 3 symmetrical balance lines serves as to separate boundary; Be divided into 3 zones and carry out labor respectively with boring gamma curve figure said, above-mentioned 3 zones are specially the analyzed area III (well depth from 4260m to 4610m) of analyzed area II analyzed area I (well depth from 3700m to 3925m), symmetrical balance line 25 and the symmetrical balance line 36 of symmetrical balance line 25 both sides (well depth from 3925m to 4446m) and symmetrical balance line 36 both sides.
(2) be axis of symmetry with said symmetrical balance line, judge whether the gamma ray change curve of said symmetrical balance line two side areas exists symmetric sections;
When there is symmetric sections in the gamma ray change curve of said symmetrical balance line both sides, explains after said drill bit gets out from a stratum and bore go back to same stratum again; When there is not symmetric sections in the gamma change curve of said symmetrical balance line both sides, explain that said drill bit continues to creep into or to get out continued from a stratum to the bottom on a stratum or top to creep into to adjacent stratum.
(3) combine the hole deviation angle two of said drill bit and the well depth data two of said drill bit present position simultaneously; To the drilling direction of said drill bit with specifically creep into the position and comprehensively judge; After promptly getting out, the trend that gets out after whether said drill bit gets out and get out from zone of interest from zone of interest finally judged creeps into which stratum adjacent with zone of interest; According to the said analysis and judgement result who gets out trend the drilling direction of said drill bit is adjusted accordingly again, after the adjustment the more said drill bit of real-time judge whether bore back zone of interest.
Said hole deviation angle two and well depth data two are in real time the distance B between detected hole deviation angle one and well depth data one and well logging equipment 3 detection device thereofs and said drill bit to be calculated according to well logging equipment 3 to draw.When said hole deviation angle two during, explain that said drill bit upwards creeps into greater than 90 °; When said hole deviation angle two during, explain that said drill bit creeps into downwards less than 90 °.When hole deviation angle two increases gradually, explain that said drill bit is in the increasing hole angle state; When hole deviation angle two reduces gradually, explain that said drill bit is in the drop angle state; Stablize when constant when hole deviation angle two, explain that said drill bit is in the hold angle state.
Because said hole deviation angle two and well depth data two are calculated the distance B between detected hole deviation angle one and well depth data one and well logging equipment detection device thereof and said drill bit in real time according to well logging equipment and are drawn.When concrete reckoning hole deviation angle two and well depth data two, be the boundary when being 90 °, the drilling direction and the present position of said drill bit are judged with well logging equipment 3 measured hole deviation angles one; When hole deviation angle one when increasing gradually or reducing gradually for 90 °; Explain that said rig continues upwards to creep into and is in the increasing hole angle state or continues to creep into and be in the drop angle state downwards; Specifically calculate between said pick-up unit and said drill bit at a distance of the increase of every meter hole deviation angle or reduce the number of degrees; Correspondingly again calculate the increase of hole deviation angle when the D or reduce the number of degrees, and then calculate the hole deviation angle two of said drill bit, further calculate the hole deviation data two of said drill bit present position again.When said hole deviation angle two during, explain that said drill bit upwards creeps into greater than 90 °; When said hole deviation angle two during, explain that said drill bit creeps into downwards less than 90 °.
In the present embodiment; For analyzed area I; At first analyzing the gamma ray change curve section symmetry of symmetrical balance line both sides about in the of 25, specifically is the gamma ray change curve of symmetrical balance line about in the of 25, shows after said drill bit gets out stratum M1 and returns stratum M1 again.Combine the hole deviation angle two of said drill bit and the well depth data two of said drill bit present position (vertical depth that comprises said drill bit present position is with tiltedly dark) simultaneously, to the drilling direction of said drill bit with specifically creep into the position and comprehensively judge.When said hole deviation angle two during, explain that said drill bit upwards creeps into greater than 90 °; When said hole deviation angle two during, explain that said drill bit creeps into downwards less than 90 °.
In analyzed area I, the said drill bit state that creeps into substantially creeps into and upwards creeps into generally for increasing hole angle afterwards earlier for drop angle with hold angle creeps into and creep into downwards generally.That is to say that in analyzed area I, said rig upwards bores back stratum M1 again after getting out stratum M1 downwards earlier generally; The well depth data two that combine said drill bit present position are simultaneously confirmed the particular location of said drill bit.To sum up, judge the drilling direction of said drill bit and specifically creep into the position, and then the trend that gets out whether said drill bit gets out zone of interest and get out zone of interest is comprehensively judged; Afterwards, according to the said analysis and judgement result who gets out trend, tackle the drilling direction of said drill bit mutually and adjust.
Simultaneously, on the symmetric sections one that is positioned at above the symmetrical balance line 25, mark a monumented point A, and utilize well logging equipment 3 to record the corresponding vertical depth in monumented point A present position and tiltedly be h deeply
Vertical depthAnd h
Tiltedly darkSimultaneously, with the symmetric sections two of said symmetric sections one symmetry on find out the symmetric flag point A ' with said monumented point A symmetry, utilize well logging equipment 3 to record the vertical depth of symmetric flag point A ' present position correspondence equally and tiltedly be h ' deeply
Vertical depthAnd h '
Tiltedly darkBecause said symmetric flag point A ' and monumented point A all are arranged in zone of interest; And symmetric flag point A ' is the repetition appearance point of monumented point A, can calculate the inclination alpha of zone of interest according to formula
.So, when adjusting,, the drilling direction of said drill bit is adjusted in conjunction with said inclination alpha according to the drilling direction that the said analysis and judgement result who gets out trend is tackled said drill bit mutually.If adjustment is improper, then possibly cause said drill bit to depart from zone of interest more.
At last, the terrain data that draws in conjunction with actual survey is judged in analyzed area I, and said drill bit gets out behind the zone of interest and be corresponding after adjusting, and whether returns zone of interest.In the present embodiment, get into the last layer of zone of interest after said drill bit gets out from zone of interest top with boring gamma curve figure, return zone of interest afterwards again, and get into M1 top, stratum in conjunction with said.
For analyzed area II; There is not symmetric sections in top and the bottom in this analysis zone; And combine the hole deviation angle two of said drill bit and the well depth data two of said drill bit present position (vertical depth that comprises said drill bit present position is with tiltedly dark) simultaneously, to the drilling direction of said drill bit with specifically creep into the position and comprehensively judge; Comprehensively judge at last the trend that gets out after whether said drill bit gets out zone of interest and get out zone of interest, adjust according to the drilling direction that the said analysis and judgement result who gets out trend is tackled said drill bit mutually then; The adjustment after the more said drill bit of real-time judge whether bore back zone of interest.In analyzed area II, the said drill bit state that creeps into substantially drop angle and hold angle before this creeps into, and is that increasing hole angle creeps into then, but said rig creeps into downwards generally.In addition, because said with not occurring symmetric sections yet among the brill gamma curve figure, then said rig does not return zone of interest after creeping into and get into the stratum M2 that is positioned at the zone of interest below downwards yet.The well depth data two that combine said drill bit present position are simultaneously confirmed the particular location of said drill bit.At last, in conjunction with the terrain data that actual survey draws, judge said drill bit creep into downwards get into stratum M2 after, do not return zone of interest, but continue to get into other stratum M3 downwards.In sum, in analyzed area II, improper or existence deficiency needs corresponding again the adjustment to the adjustment of said drill bit drilling direction.
For analyzed area III; At first analyze the gamma ray change curve section symmetry of symmetrical balance line both sides about in the of 36; Specifically be the gamma ray change curve symmetry of symmetrical balance line about in the of 36, show after said drill bit gets out a stratum and return same stratum again.Combine the hole deviation angle two of said drill bit and the well depth data two of said drill bit present position (comprising that the vertical depth of said drill bit present position is with tiltedly dark) simultaneously; To the drilling direction of said drill bit with specifically creep into the position and comprehensively judge, comprehensively judge the trend that gets out after whether said drill bit gets out zone of interest and get out zone of interest at last; According to the said analysis and judgement result who gets out trend, tackle the drilling direction of said drill bit mutually and adjust then; After the adjustment, whether the said drill bit of real-time judge bores back zone of interest again.In analyzed area III, the said drill bit state that creeps into substantially creeps into and upwards creeps into generally for increasing hole angle afterwards earlier for drop angle with hold angle creeps into and creep into downwards generally.That is to say that in analyzed area III, said rig upwards bores back stratum M3 again after earlier getting out stratum M3 downwards generally, combines the well depth data two of said drill bit present position simultaneously, to the drilling direction of said drill bit with creep into the position and comprehensively judge; And according to the analysis and judgement result and the inclination angle of the stratum M3 that combines to calculate, tackle the drilling direction of said drill bit mutually and adjust; The adjustment after the more said drill bit of real-time judge whether bore back zone of interest.At last, in conjunction with the terrain data that actual survey draws, judge in this analyzed area; Said drill bit upwards bores back stratum M3 again after getting out stratum M3 downwards earlier generally; And get into M3 top, stratum, but not returning zone of interest yet is stratum M1, but is arranged in the stratum M3 below the zone of interest.In sum, in analyzed area III, also need the drilling direction of said drill bit is adjusted accordingly again.
To sum up; Can know through above-mentioned analysis and to learn that in the horizontal drilling process, said drill bit pierces and get out trend in zone of interest; Carry out analysis-by-synthesis in conjunction with concrete drilling direction of said drill bit and the residing particular location of said drill bit; Analyze the trend that gets out after whether said drill bit gets out zone of interest and get out zone of interest, and adjust according to the drilling direction that analysis result is tackled said drill bit mutually, after the adjustment the more said drill bit of real-time judge whether bore back zone of interest.To sum up; The present invention accurately judges the trend of getting out that pierces of said drill bit in zone of interest; Drilling direction and the hole deviation angle of tackling said rig mutually according to analysis result after the analysis-by-synthesis are adjusted, thereby can very effective comparable data be provided for the scene supervision.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any restriction, every technical spirit changes any simple modification, change and the equivalent structure that above embodiment did according to the present invention, all still belongs in the protection domain of technical scheme of the present invention.
Claims (4)
1. drill-following natural gamma geosteering method for horizontal well is characterized in that this method may further comprise the steps:
Step 1, drill bit are in the horizontal drilling process of zone of interest; The gamma ray that in real time boring stratum natural radiomaterial is produced through down-hole natural gamma detector (1) detects, and synchronously measured signal is reached data acquisition and the analysis process system (2) that is positioned at ground through cable; Simultaneously, well logging equipment (3) reaches data acquisition and analysis process system (2) with detected hole deviation angle one with well depth data one in real time synchronously;
Step 2, said data acquisition and analysis process system (2) according to gamma detector (1) and the measured data creating gamma ray of well logging equipment (3) with well depth change with boring gamma curve figure; With boring that gamma curve figure analyzes and tackling piercing of said drill bit mutually and the trend that gets out is declared knowledge according to analysis result, it is following that the knowledge process is declared in its analysis to said:
(1) make the symmetrical balance line: said with boring the many symmetrical balance lines that draw among the gamma curve figure; Corresponding tiltedly dark dividing line when said symmetrical balance line is one=90 ° of a hole deviation angle, said many symmetrical balance lines will saidly be divided into a plurality of zones with brill gamma curve figure;
(2) be axis of symmetry with said symmetrical balance line, judge whether the gamma ray change curve of said symmetrical balance line two side areas exists symmetric sections;
When there is symmetric sections in the gamma ray change curve of said symmetrical balance line both sides, explains after said drill bit gets out from a stratum and bore go back to same stratum again; When there is not symmetric sections in the gamma change curve of said symmetrical balance line both sides, explain that said drill bit continues to creep into or to get out continued from a stratum to the bottom on a stratum or top to creep into to adjacent stratum;
(3) combine the hole deviation angle two of said drill bit and the well depth data two of said drill bit present position simultaneously; To the drilling direction of said drill bit with specifically creep into the position and comprehensively judge; After promptly getting out, the trend that gets out after whether said drill bit gets out and get out from zone of interest from zone of interest finally judged creeps into which stratum adjacent with zone of interest; According to the said analysis and judgement result who gets out trend the drilling direction of said drill bit is adjusted accordingly again, after the adjustment the more said drill bit of real-time judge whether bore back zone of interest;
Said hole deviation angle two and well depth data two are in real time the distance B between detected hole deviation angle one and well depth data one and well logging equipment (3) detection device thereof and said drill bit to be calculated according to well logging equipment (3) to draw.
2. according to the described drill-following natural gamma geosteering method for horizontal well of claim 1, it is characterized in that: the distance between gamma detector described in the step 1 (1) and the said drill bit end is 7-15m.
3. according to claim 1 or 2 described drill-following natural gamma geosteering method for horizontal well; It is characterized in that: when there is symmetric sections in the gamma ray change curve when said symmetrical balance line both sides described in the step (two); Therein a symmetric sections subscript one monumented point A and simultaneously with another symmetric sections of this symmetric sections symmetry on find out the symmetric flag point A ' with said monumented point A symmetry; The repetition appearance point that said symmetric flag point A ' is said monumented point A is according to formula
Can calculate the inclination alpha on stratum, said monumented point A and symmetric flag point A ' place, h in the formula
Vertical depthAnd h
Tiltedly darkIt is dark with tiltedly to be respectively the corresponding vertical depth in said monumented point A present position, h '
Vertical depthAnd h '
Tiltedly darkIt is dark with tiltedly to be respectively the corresponding vertical depth in said symmetric flag point A ' present position;
During the drilling direction of said drill bit is adjusted accordingly described in the step (three),, the drilling direction of said drill bit is adjusted in conjunction with said inclination alpha according to the said analysis and judgement result who gets out trend.
4. according to claim 1 or 2 described drill-following natural gamma geosteering method for horizontal well; It is characterized in that: described in the step (three) to the drilling direction of said drill bit and specifically creep into the position when comprehensively judging; When said hole deviation angle two during, explain that said drill bit upwards creeps into greater than 90 °; When said hole deviation angle two during, explain that said drill bit creeps into downwards less than 90 °;
When hole deviation angle two increases gradually, explain that said drill bit is in the increasing hole angle state; When hole deviation angle two reduces gradually, explain that said drill bit is in the drop angle state; Stablize when constant when hole deviation angle two, explain that said drill bit is in the hold angle state.
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| CN1924291A (en) * | 2006-07-27 | 2007-03-07 | 山东省煤田地质局第二勘探队 | Process for gas collection by a well with one mouth and multiple branches drilled along coal layer |
| CN101082277A (en) * | 2007-07-05 | 2007-12-05 | 北京奥能瑞科石油技术有限公司重庆分公司 | Oil well drilling geological X-ray fluorescent debris logging method |
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2009
- 2009-01-23 CN CN2009100210282A patent/CN101476463B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1656302A (en) * | 2002-05-28 | 2005-08-17 | 施卢默格海外有限公司 | System and method for quantitatively determining variations of a formation characteristic after an event |
| CN2793324Y (en) * | 2005-04-14 | 2006-07-05 | 中国石化集团胜利石油管理局钻井工艺研究院 | Gamma drilling measuring instrument for declination and location of well |
| CN1924291A (en) * | 2006-07-27 | 2007-03-07 | 山东省煤田地质局第二勘探队 | Process for gas collection by a well with one mouth and multiple branches drilled along coal layer |
| CN101082277A (en) * | 2007-07-05 | 2007-12-05 | 北京奥能瑞科石油技术有限公司重庆分公司 | Oil well drilling geological X-ray fluorescent debris logging method |
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