CN101476463A - 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, making a 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 oil drilling exploration and 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 substantially, 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, surveying data by shown landwaste content of mudstone that goes out and gas can in time judge bit drills and meet the lithology that is different from target zone, according to measured hole deviation angle and prediction locus, can judge drill bit and whether get out target zone simultaneously.
According to discovering, following 6 kinds of situations can appear when drill bit is walked in horizontal segment, and relevant parameter and data reaction are as follows:
1, when drill bit when last country rock enters 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 GR becomes low value by the high value.
2, when drill bit when gas-bearing formation enters 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 natural gamma curve becomes high value by low value.
3, when drill bit enters 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 GR becomes low value by the high value.
4, when drill bit when gas-bearing formation enters 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 natural gamma 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; GR 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; GR 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 GR and other engineering parameter.The combinatory analysis of any several data can realize the well logging guiding to horizontal segment.The site mud logging data has real-time, immediately following drill bit.And natural gamma curve is well declared the lithology of having known drilling strata.The hole deviation data become map analysis to annotate bit course preferably.Gas survey numerical value variation reaction to a certain degree the quality of formation gas bearing degree.At 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 target zone often occurs, the stratum can duplicate phenomenon on section.Simultaneously, along with the increase of horizontal movement, target zone has flexural deformation in various degree in the horizontal, utilizes vertical depth to convert to describe the form of GR can not represent target zone natural gamma curve feature, that is to say that log data has lost reference value; It is very big that the complexity of location of living in addition natural 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 is subjected to all multifactor impacts, 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 interval of interest.
Summary of the invention
Technical problem to be solved by this invention is at 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 interval of interest.
For solving the problems of the technologies described above, the technical solution used in the present invention 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: described with boring the many symmetrical balance lines that draw in the gamma graph, the tiltedly dark dividing line of correspondence when described symmetrical balance line is one=90 ° of a hole deviation angle, described many symmetrical balance lines will describedly be divided into a plurality of zones with the brill gamma graph;
(2) be axis of symmetry with described symmetrical balance line, judge whether the gamma rays change curve of described symmetrical balance line two side areas exists symmetric sections;
When there is symmetric sections in the gamma rays change curve of described symmetrical balance line both sides, illustrates after described drill bit gets out from a stratum and bore go back to same stratum again; When there was not symmetric sections in the gamma change curve of described symmetrical balance line both sides, illustrating that described drill bit continues to the bottom on a stratum or creep at the top or get out the back from a stratum continued to creep into to adjacent stratum;
(3) simultaneously in conjunction with the hole deviation angle two of described drill bit and the well depth data two of described drill bit present position, to the drilling direction of described drill bit with specifically creep into the position and comprehensively judge, after promptly getting out, the trend that gets out after whether described drill bit gets out and get out from target zone from target zone finally judged creeps into which stratum adjacent with target zone, according to the described analysis and judgement result who gets out trend the drilling direction of described drill bit is adjusted accordingly again, after adjusting again the described drill bit of real-time judge whether bore back target zone;
Described hole deviation angle two and well depth data two are in real time the distance D between detected hole deviation angle one and well depth data one and well logging equipment detection device thereof and described drill bit to be calculated according to well logging equipment to draw.
Distance between gamma detector described in the step 1 and the described drill bit end is 7-15m.
When there is symmetric sections in the gamma rays change curve when described symmetrical balance line both sides described in the step (two), therein a symmetric sections subscript one mark A and simultaneously with another symmetric sections of this symmetric sections symmetry on find out symmetric flag point A ' with described mark A symmetry, described symmetric flag point A ' repeats a little for described mark A's, according to formula
Can calculate the inclination alpha on described mark A and stratum, symmetric flag point A ' place, h in the formula
Vertical depthAnd h
Tiltedly darkBe respectively the vertical depth of described mark A present position correspondence and tiltedly dark, h '
Vertical depthAnd h '
Tiltedly darkBe respectively the vertical depth of described symmetric flag point A ' present position correspondence and tiltedly dark;
During the drilling direction of described drill bit is adjusted accordingly described in the step (three),, the drilling direction of described drill bit is adjusted in conjunction with described inclination alpha according to the described analysis and judgement result who gets out trend.
Described in the step (three) to the drilling direction of described drill bit and specifically creep into the position when comprehensively judging, when described hole deviation angle two during, illustrate that described drill bit upwards creeps into greater than 90 °; When described hole deviation angle two during, illustrate that described drill bit creeps into downwards less than 90 °;
When hole deviation angle two increases gradually, illustrate that described drill bit is in the increasing hole angle state; When hole deviation angle two reduces gradually, illustrate that described drill bit is in the drop angle state; Stablize when constant when hole deviation angle two, illustrate that described 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 and know and declare that to know method step simple drill bit, operate simple and easy, 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 target zone, simultaneously in conjunction with hole deviation angle situation of change, can reliably hold creep into the get out trend of drill bit in the horizontal drilling process in target zone, effectively avoided in horizontal drilling process along with horizontal movement increases, utilize vertical depth to convert to describe the form of GR can not represent target zone natural gamma curve feature, especially lose reference value at log data, the geosteering that series of factors such as regional down-hole of living in addition geological condition complexity 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 interval of interest.3, in the practice, the present invention declares knowledge by 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 is subjected to all multifactor impacts, the geosteering difficulty is big, on-the-spot supervision is the practical problem 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 by the present invention.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
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 graph.
Description of reference numerals:
1-gamma detector; 2-data acquisition and analysis process system; 3-well logging equipment;
4-symmetrical balance line one; 5-symmetrical balance line two; 6-symmetrical balance line three.
The specific embodiment
As shown in Figures 1 and 2, drill-following natural gamma horizontal well geosteering method of the present invention may further comprise the steps:
(1) make the symmetrical balance line: described with boring the many symmetrical balance lines that draw in the gamma graph, the tiltedly dark dividing line of correspondence when described symmetrical balance line is hole deviation angle=90 °, described many symmetrical balance lines will describedly be divided into a plurality of zones with the brill gamma graph.
In the present embodiment, described with bore gamma graph be well depth (referring to tiltedly dark) from 3630m to the gamma rays 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, entering stratum M1 was target zone.
At first make the symmetrical balance line, in the present embodiment, the quantity of described symmetrical balance line is 3, specifically be that described well depth is respectively 3965m in the gamma graph with boring, the symmetrical balance line 1 of correspondence when 3815m and 4446m, symmetrical balance line 25 and symmetrical balance line 36, 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 graph described, above-mentioned 3 zones are specially the analyzed area I (well depth from 3700m to 3925m) of symmetrical balance line 25 both sides, the analyzed area III of analyzed area II between symmetrical balance line 25 and the symmetrical balance line 36 (well depth from 3925m to 4446m) and symmetrical balance line 36 both sides (well depth from 4260m to 4610m).
(2) be axis of symmetry with described symmetrical balance line, judge whether the gamma rays change curve of described symmetrical balance line two side areas exists symmetric sections;
When there is symmetric sections in the gamma rays change curve of described symmetrical balance line both sides, illustrates after described drill bit gets out from a stratum and bore go back to same stratum again; When there was not symmetric sections in the gamma change curve of described symmetrical balance line both sides, illustrating that described drill bit continues to the bottom on a stratum or creep at the top or get out the back from a stratum continued to creep into to adjacent stratum.
(3) simultaneously in conjunction with the hole deviation angle two of described drill bit and the well depth data two of described drill bit present position, to the drilling direction of described drill bit with specifically creep into the position and comprehensively judge, after promptly getting out, the trend that gets out after whether described drill bit gets out and get out from target zone from target zone finally judged creeps into which stratum adjacent with target zone, according to the described analysis and judgement result who gets out trend the drilling direction of described drill bit is adjusted accordingly again, after adjusting again the described drill bit of real-time judge whether bore back target zone.
Described hole deviation angle two and well depth data two are in real time the distance D between detected hole deviation angle one and well depth data one and well logging equipment 3 detection device thereofs and described drill bit to be calculated according to well logging equipment 3 to draw.When described hole deviation angle two during, illustrate that described drill bit upwards creeps into greater than 90 °; When described hole deviation angle two during, illustrate that described drill bit creeps into downwards less than 90 °.When hole deviation angle two increases gradually, illustrate that described drill bit is in the increasing hole angle state; When hole deviation angle two reduces gradually, illustrate that described drill bit is in the drop angle state; Stablize when constant when hole deviation angle two, illustrate that described drill bit is in the hold angle state.
Because described hole deviation angle two and well depth data two are calculated the distance D between detected hole deviation angle one and well depth data one and well logging equipment detection device thereof and described 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 described 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 °, illustrate that described 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 described checkout gear and described 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 described drill bit, further calculate the hole deviation data two of described drill bit present position again.When described hole deviation angle two during, illustrate that described drill bit upwards creeps into greater than 90 °; When described hole deviation angle two during, illustrate that described drill bit creeps into downwards less than 90 °.
In the present embodiment, for analyzed area I, at first analyzing the gamma rays change curve section symmetry of symmetrical balance line both sides about in the of 25, specifically is the gamma rays change curve of symmetrical balance line about in the of 25, shows after described drill bit gets out stratum M1 and returns stratum M1 again.Simultaneously in conjunction with the hole deviation angle two of described drill bit and the well depth data two of described drill bit present position (comprising the vertical depth of described drill bit present position and tiltedly dark), to the drilling direction of described drill bit with specifically creep into the position and comprehensively judge.When described hole deviation angle two during, illustrate that described drill bit upwards creeps into greater than 90 °; When described hole deviation angle two during, illustrate that described drill bit creeps into downwards less than 90 °.
In analyzed area I, the described 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, described rig upwards bores back stratum M1 again after getting out stratum M1 downwards earlier generally; In conjunction with the well depth data two of described drill bit present position, determine the particular location of described drill bit simultaneously.To sum up, judge the drilling direction of described drill bit and specifically creep into the position, and then the trend that gets out whether described drill bit gets out target zone and get out target zone is comprehensively judged; Afterwards, according to the described analysis and judgement result who gets out trend, tackle the drilling direction of described drill bit mutually and adjust.
Simultaneously, on the symmetric sections one that is positioned at above the symmetrical balance line 25, mark a mark A, and utilize well logging equipment 3 to record the vertical depth of mark A present position correspondence and tiltedly be h deeply
Vertical depthAnd h
Tiltedly darkSimultaneously, with the symmetric sections two of described symmetric sections one symmetry on find out symmetric flag point A ' with described mark 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 described symmetric flag point A ' and mark A all are arranged in target zone, and symmetric flag point A ' is repeating a little of mark A, according to formula
Can calculate the inclination alpha of target zone.So, when adjusting,, the drilling direction of described drill bit is adjusted in conjunction with described inclination alpha according to the drilling direction that the described analysis and judgement result who gets out trend is tackled described drill bit mutually.If it is improper to adjust, then may cause described drill bit to depart from target zone more.
At last, the terrain data that draws in conjunction with actual survey is judged in analyzed area I, and described drill bit gets out behind the target zone and be corresponding after adjusting, and whether returns target zone.In the present embodiment, enter the last layer of target zone after described drill bit gets out from target zone top with boring gamma graph, return target zone afterwards again, and enter M1 top, stratum in conjunction with described.
For analyzed area II, there is not symmetric sections in top and the bottom in this analysis zone, and simultaneously in conjunction with the hole deviation angle two of described drill bit and the well depth data two of described drill bit present position (comprising the vertical depth of described drill bit present position and tiltedly dark), to the drilling direction of described drill bit with specifically creep into the position and comprehensively judge; The last trend of comprehensively judging after whether described drill bit gets out target zone and get out target zone that gets out is adjusted according to the drilling direction that the described analysis and judgement result who gets out trend is tackled described drill bit mutually then; After adjusting again the described drill bit of real-time judge whether bore back target zone.In analyzed area II, the described 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 described rig creeps into downwards generally.In addition, because described with not occurring symmetric sections yet in the brill gamma graph, then described rig does not return target zone after creeping into and enter the stratum M2 that is positioned at the target zone below downwards yet.In conjunction with the well depth data two of described drill bit present position, determine the particular location of described drill bit simultaneously.At last, in conjunction with the terrain data that actual survey draws, judge described drill bit creep into downwards enter stratum M2 after, do not return target zone, but continue to enter other stratum M3 downwards.In sum, in analyzed area II, improper or existence deficiency needs corresponding again the adjustment to the adjustment of described drill bit drilling direction.
For analyzed area III, at first analyze the gamma rays change curve section symmetry of symmetrical balance line both sides about in the of 36, specifically be the gamma rays change curve symmetry of symmetrical balance line about in the of 36, show after described drill bit gets out a stratum and return same stratum again.Simultaneously in conjunction with the hole deviation angle two of described drill bit and the well depth data two of described drill bit present position (comprising the vertical depth of described drill bit present position and tiltedly dark), to the drilling direction of described drill bit with specifically creep into the position and comprehensively judge, comprehensively judge the trend that gets out after whether described drill bit gets out target zone and get out target zone at last; According to the described analysis and judgement result who gets out trend, tackle the drilling direction of described drill bit mutually and adjust then; After the adjustment, whether the described drill bit of real-time judge bores back target zone again.In analyzed area III, the described 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, described rig upwards bores back stratum M3 again after earlier getting out stratum M3 downwards generally, the while is in conjunction with the well depth data two of described drill bit present position, to the drilling direction of described drill bit with creep into the position and comprehensively judge; And, tackle the drilling direction of described drill bit mutually and adjust according to the analysis and judgement result and in conjunction with the inclination angle of the stratum M3 that calculates; After adjusting again the described drill bit of real-time judge whether bore back target zone.At last, in conjunction with the terrain data that actual survey draws, judge in this analyzed area, described drill bit upwards bores back stratum M3 again after getting out stratum M3 downwards earlier generally, and enter M3 top, stratum, but not returning target zone yet is stratum M1, but is arranged in the stratum M3 below the target zone.In sum, in analyzed area III, also need the drilling direction of described drill bit is adjusted accordingly again.
To sum up, can know by above-mentioned analysis and to learn, in the horizontal drilling process, described drill bit pierces and gets out trend in target zone, carry out analysis-by-synthesis in conjunction with concrete drilling direction of described drill bit and the residing particular location of described drill bit, analyze the trend that gets out after whether described drill bit gets out target zone and get out target zone, and adjust according to the drilling direction that analysis result is tackled described drill bit mutually, after adjusting again the described drill bit of real-time judge whether bore back target zone.To sum up, the present invention accurately judges the trend of getting out that pierces of described drill bit in target zone, drilling direction and the hole deviation angle of tackling described rig mutually according to analysis result after the analysis-by-synthesis are adjusted, thereby can provide very effective comparable data for the scene supervision.
The above; it only is preferred embodiment of the present invention; be not that the present invention is imposed any restrictions, everyly any simple modification that above embodiment did, change and equivalent structure changed, all still belong in the protection domain of technical solution of the present invention according to the technology of the present invention essence.
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 target zone, the gamma rays that in real time boring stratum natural radioactive substance is produced by down-hole natural gamma probe (1) detects, and synchronously measured signal is reached data acquisition and the analysis process system (2) that is positioned at ground by cable; Simultaneously, well logging equipment (3) reaches data acquisition and analysis process system (2) synchronously with detected hole deviation angle one and well depth data one in real time;
Step 2, described data acquisition and analysis process system (2) according to gamma detector (1) and the measured data creating gamma rays of well logging equipment (3) with well depth change with boring gamma graph, with boring that gamma graph is analyzed and tackling piercing of described drill bit mutually and the trend that gets out is declared knowledge according to analysis result, it is as follows that the knowledge process is declared in its analysis to described:
(1) make the symmetrical balance line: described with boring the many symmetrical balance lines that draw in the gamma graph, the tiltedly dark dividing line of correspondence when described symmetrical balance line is one=90 ° of a hole deviation angle, described many symmetrical balance lines will describedly be divided into a plurality of zones with the brill gamma graph;
(2) be axis of symmetry with described symmetrical balance line, judge whether the gamma rays change curve of described symmetrical balance line two side areas exists symmetric sections;
When there is symmetric sections in the gamma rays change curve of described symmetrical balance line both sides, illustrates after described drill bit gets out from a stratum and bore go back to same stratum again; When there was not symmetric sections in the gamma change curve of described symmetrical balance line both sides, illustrating that described drill bit continues to the bottom on a stratum or creep at the top or get out the back from a stratum continued to creep into to adjacent stratum;
(3) simultaneously in conjunction with the hole deviation angle two of described drill bit and the well depth data two of described drill bit present position, to the drilling direction of described drill bit with specifically creep into the position and comprehensively judge, after promptly getting out, the trend that gets out after whether described drill bit gets out and get out from target zone from target zone finally judged creeps into which stratum adjacent with target zone, according to the described analysis and judgement result who gets out trend the drilling direction of described drill bit is adjusted accordingly again, after adjusting again the described drill bit of real-time judge whether bore back target zone;
Described hole deviation angle two and well depth data two are in real time the distance D between detected hole deviation angle one and well depth data one and well logging equipment (3) detection device thereof and described 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 described 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 rays change curve when described symmetrical balance line both sides described in the step (two), therein a symmetric sections subscript one mark A and simultaneously with another symmetric sections of this symmetric sections symmetry on find out symmetric flag point A ' with described mark A symmetry, described symmetric flag point A ' repeats a little for described mark A's, according to formula
Can calculate the inclination alpha on described mark A and stratum, symmetric flag point A ' place, h in the formula
Vertical depthAnd h
Tiltedly darkBe respectively the vertical depth of described mark A present position correspondence and tiltedly dark,
With
Be respectively the vertical depth of described symmetric flag point A ' present position correspondence and tiltedly dark;
During the drilling direction of described drill bit is adjusted accordingly described in the step (three),, the drilling direction of described drill bit is adjusted in conjunction with described inclination alpha according to the described 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 described drill bit and specifically creep into the position when comprehensively judging, when described hole deviation angle two during, illustrate that described drill bit upwards creeps into greater than 90 °; When described hole deviation angle two during, illustrate that described drill bit creeps into downwards less than 90 °;
When hole deviation angle two increases gradually, illustrate that described drill bit is in the increasing hole angle state; When hole deviation angle two reduces gradually, illustrate that described drill bit is in the drop angle state; Stablize when constant when hole deviation angle two, illustrate that described drill bit is in the hold angle state.
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2009
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| CN113464121B (en) * | 2021-05-12 | 2023-08-25 | 中煤科工集团西安研究院有限公司 | Method for determining gamma geosteering drilling track of azimuth while drilling |
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