CN103790579A - Method and device for determining distance between bit and formation interface in geosteering while drilling - Google Patents
Method and device for determining distance between bit and formation interface in geosteering while drilling Download PDFInfo
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Abstract
The invention discloses a method and a device for determining distance between a bit and a formation interface in geosteering while drilling. The method includes the steps of acquiring documents of natural gamma-ray logging in position while-drilling in real time and predicting the relative included angle between the formation interface to be drilled and the drilling direction, acquiring the vertical distance between the preset position in the drilling direction and the formation interface to be drilled, and determining the distance from the bit to the formation interface to be drilled in the drilling direction according to the relative included angle and the vertical distance. The preset position is the position of a detector in the location of the natural gamma-ray curve varies at first when the bit drills to the formation interface to be drilled. According to the documents of the natural gamma-ray logging in position-while-drilling, the distance between the bit and the formation interface to be drilled is quantized, and thus, natural gamma-ray logging in position-while-drilling can facilitate geosteering well.
Description
Technical field
The present invention relates to geosteering and geological exploration techniques field, particularly a kind of with boring method and the device of determining drill bit and bed boundary distance in geosteering.
Background technology
Geosteering is one of forward position drilling technology growing up the nineties in 20th century, to utilize in drilling process geologic parameter or the engineering parameters such as natural gamma, density of earth formations, formation resistivity, ring pressure, temperature and the pressure measured in real time, judge the stratum that bit drills is met, adjust in time drilling trace.Utilize geosteering can guarantee that drill bit creeps into as far as possible in Favorable Reservoir, reach the object that improves output and recovery ratio.Along with the continuous increase of present horizontal well and directional well, geosteering is a requisite new and high technology in drilling process.
In horizontal well and high angle hole drilling process, a kind of important geosteering with boring orientation gamma ray log,, in well logging during process, multiple gamma detectors are placed in to drill collar, measure the natural gamma radioactivity on stratum, its survey data has orientation characteristic, can adjust in real time the drilling trace of drill bit by uploading in real time the upper and lower orientation gamma ray curve on ground, keep drill bit to creep in reservoir.But in technology, whether the upper and lower orientation gamma curve that uploads in real time ground with brill orientation gamma ray log only creeps at reservoir for qualitatively judging drill bit, and to bit course adjustment, can not quantitatively judge the distance of drill bit and bed boundary at present.
Summary of the invention
It is a kind of with boring method and the device of determining drill bit and bed boundary distance in geosteering that the embodiment of the present invention provides, and solved the technical problem that can not quantitatively judge the distance of drill bit and bed boundary in prior art.
It is a kind of with boring the method for determining drill bit and bed boundary distance in geosteering that the embodiment of the present invention provides, and the method comprises: Real-time Obtaining is with the data of boring orientation gamma ray log, and prediction is by the relative angle of drilling strata interface and drilling direction; Obtain predeterminated position and the described vertical distance by drilling strata interface on drilling direction, wherein, described predeterminated position be in bit drills to described during by drilling strata interface, the position of the probe in the orientation, gamma ray curve place first changing; According to described relative angle and described vertical distance determine drill bit on drilling direction with the described distance by drilling strata interface.
In one embodiment, described data comprises described upper position gamma ray curve and lower orientation gamma ray curve with boring orientation gamma ray log.
In one embodiment, utilize the relative angle of described well-log information prediction by drilling strata interface and drilling direction, comprise: in described bit drills to described during by drilling strata interface, utilize the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction, the described relative angle by drilling strata interface and drilling direction of prediction.
In one embodiment, utilize the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction, the described relative angle by drilling strata interface and drilling direction of prediction, comprise: utilize Monte Carlo Calculation modeling calculation result data, obtain the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction; Determine the described relative angle by drilling strata interface and drilling direction by following formula:
wherein, RD is the Circular measure value of the described relative angle by drilling strata interface and drilling direction, Δ P is the change point that first changes on the change point that first changes on upper position gamma ray curve and the lower orientation gamma ray curve distance on drilling direction, and a, b, c, d are respectively constant.
The natural gamma value of the change point first changing on described upper position gamma ray curve in one embodiment, and upper position gamma ray curve are gone forward any variable quantity of natural gamma value within the scope of the first preset value; The natural gamma value of the change point first changing on described lower orientation gamma ray curve and lower orientation gamma ray curve are gone forward any variable quantity of natural gamma value within the scope of the second preset value.
In one embodiment, described the first preset value scope be described upper position gamma ray curve go forward any natural gamma value 10% to 15%; Described the second preset value scope be described lower orientation gamma ray curve go forward any natural gamma value 10% to 15%.
In one embodiment, according to described relative angle and described vertical distance determine described drill bit on drilling direction with the described distance by drilling strata interface, comprise: according to the ratio of the sine value of described vertical distance and described relative angle, determine described drill bit on drilling direction with the described distance by drilling strata interface.
In one embodiment, by following formula determine described drill bit on drilling direction with the described distance by drilling strata interface:
wherein, L be described drill bit on drilling direction with the described distance by drilling strata interface,
the Circular measure value of the described relative angle by drilling strata interface and drilling direction, d
0be the distance between described probe and described drill bit, DOI is predeterminated position and the described vertical distance by drilling strata interface on drilling direction.
In one embodiment, definite drill bit on drilling direction with the described distance by drilling strata interface after, also comprise: follow the tracks of described drill bit and the described distance by drilling strata interface according to described drill bit rate of penetration.
The embodiment of the present invention also provides a kind of device of determining drill bit and bed boundary distance in geosteering with boring of stating, this device comprises: angle prediction module, for Real-time Obtaining, with the data of boring orientation gamma ray log, prediction is by the relative angle of drilling strata interface and drilling direction; Apart from acquisition module, for obtaining predeterminated position and the described vertical distance by drilling strata interface on drilling direction, wherein, described predeterminated position be in described bit drills to described during by drilling strata interface, the position of the probe in the orientation, gamma ray curve place first changing; Apart from determination module, for determine according to described relative angle and described vertical distance drill bit on drilling direction with the described distance by drilling strata interface.
In one embodiment, described data comprises described upper position gamma ray curve and lower orientation gamma ray curve with boring orientation gamma ray log.
In one embodiment, described angle prediction module, for in described bit drills to described during by drilling strata interface, utilize the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction, the described relative angle by drilling strata interface and drilling direction of prediction.
In one embodiment, described angle prediction module comprises: distance acquiring unit, be used for utilizing Monte Carlo Calculation modeling calculation result data, obtain the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction; Angle predicting unit, for determine the described relative angle by drilling strata interface and drilling direction by following formula:
wherein, RD is the Circular measure value of the described relative angle by drilling strata interface and drilling direction, Δ P is the change point that first changes on the change point that first changes on upper position gamma ray curve and the lower orientation gamma ray curve distance on drilling direction, and a, b, c, d are respectively constant.
The natural gamma value of the change point first changing on described upper position gamma ray curve in one embodiment, and upper position gamma ray curve are gone forward any variable quantity of natural gamma value within the scope of the first preset value; The natural gamma value of the change point first changing on described lower orientation gamma ray curve and lower orientation gamma ray curve are gone forward any variable quantity of natural gamma value within the scope of the second preset value.
In one embodiment, described the first preset value scope be described upper position gamma ray curve go forward any natural gamma value 10% to 15%; Described the second preset value scope be described lower orientation gamma ray curve go forward any natural gamma value 10% to 15%.
In one embodiment, described apart from determination module, for according to the ratio of the sine value of described vertical distance and described relative angle, determine described drill bit on drilling direction with the described distance by drilling strata interface.
In one embodiment, described apart from determination module by following formula determine described drill bit on drilling direction with the described distance by drilling strata interface:
wherein, L be described drill bit on drilling direction with the described distance by drilling strata interface,
the Circular measure value of the described relative angle by drilling strata interface and drilling direction, d
0be the distance between described probe and described drill bit, DOI is predeterminated position and the described vertical distance by drilling strata interface on drilling direction.
In one embodiment, in geosteering, determine that with boring the device of drill bit and bed boundary distance also comprises: track in range module, for definite drill bit on drilling direction with the described distance by drilling strata interface after, follow the tracks of described drill bit and the described distance by drilling strata interface according to described drill bit rate of penetration.
In embodiments of the present invention, data by Real-time Obtaining with brill orientation gamma ray log, predict the relative angle by drilling strata interface and drilling direction, and obtain predeterminated position and the described vertical distance by drilling strata interface on drilling direction, this predeterminated position is to described during by drilling strata interface in bit drills, the position of the probe in the orientation, gamma ray curve place first changing, finally, according to the relative angle of prediction and the vertical distance obtained determine drill bit on drilling direction with the described distance by drilling strata interface, realize and having utilized with the data of boring orientation gamma ray log, quantitatively determine drill bit and the described distance by drilling strata interface, avoid in prior art, only whether creep into and defect that bit course is adjusted at reservoir for qualitatively judging drill bit with the data of boring orientation gamma ray log, thereby contribute to serve better geosteering with boring orientation gamma ray log.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, does not form limitation of the invention.In the accompanying drawings:
Fig. 1 is a kind of flow chart with determining the method for drill bit and bed boundary distance in brill geosteering that the embodiment of the present invention provides;
Fig. 2 be a kind of definite drill bit of providing of the embodiment of the present invention on drilling direction with schematic diagram by drilling strata interface distance;
Fig. 3 is a kind of schematic diagram that uploads in real time the upper and lower orientation gamma ray curve on ground with brill orientation gamma ray log that the embodiment of the present invention provides;
Fig. 4 is the schematic diagram of a kind of three-dimensional Monte Carlo Calculation model that provides of the embodiment of the present invention;
Fig. 5 is the distance of change point on drilling direction and the relation curve schematic diagram of relative angle first changing on a kind of upper and lower orientation gamma ray curve that provides of the embodiment of the present invention;
Fig. 6 is a kind of structured flowchart with determining the device of drill bit and bed boundary distance in brill geosteering that the embodiment of the present invention provides.
The specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in further details.At this, exemplary embodiment of the present invention and explanation thereof are used for explaining the present invention, but not as a limitation of the invention.
In embodiments of the present invention, provide a kind of with boring the method for determining drill bit and bed boundary distance in geosteering, as shown in Figure 1, the method comprises:
Step 101: Real-time Obtaining is with the data of boring orientation gamma ray log, and prediction is by the relative angle of drilling strata interface and drilling direction;
Step 102: obtain predeterminated position and the described vertical distance by drilling strata interface on drilling direction, wherein, described predeterminated position be in bit drills to described during by drilling strata interface, the position of the probe in the orientation, gamma ray curve place first changing;
Step 103: according to described relative angle and described vertical distance determine described drill bit on drilling direction with the described distance by drilling strata interface.
Flow process is as shown in Figure 1 known, in embodiments of the present invention, data by Real-time Obtaining with brill orientation gamma ray log, predict the relative angle by drilling strata interface and drilling direction, and obtain predeterminated position and the described vertical distance by drilling strata interface on drilling direction, this predeterminated position is to described during by drilling strata interface in bit drills, the position of the probe in the orientation, gamma ray curve place first changing, finally, according to the relative angle of prediction and the vertical distance obtained determine drill bit on drilling direction with the described distance by drilling strata interface, realize and having utilized with the data of boring orientation gamma ray log, quantitatively determine drill bit and the described distance by drilling strata interface, avoid in prior art, only whether creep into and defect that bit course is adjusted at reservoir for qualitatively judging drill bit with the data of boring orientation gamma ray log, thereby contribute to serve better geosteering with boring orientation gamma ray log.
Utilizing with the data of boring orientation gamma ray log, in the process of prediction by the relative angle of drilling strata interface and drilling direction, above-mentionedly can in drilling course, measure the natural gamma value of different azimuth with boring orientation gamma ray log, and export the Natural Gamma-ray Logging Curves of different azimuth.When concrete enforcement, above-mentioned with the data of boring orientation gamma ray log be Real-time Obtaining with the upper position gamma ray curve and the lower orientation gamma ray curve that bore in the Natural Gamma-ray Logging Curves of the different azimuth of measuring in orientation gamma ray log.
Obtain with boring after the data of orientation gamma ray log, can predict in the following manner the relative angle by drilling strata interface and drilling direction, for example, in described bit drills to described during by drilling strata interface, utilize the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction, on drilling direction, first the distance between the change point first changing on the change point changing on upper position gamma ray curve and lower orientation gamma ray curve, the described relative angle by drilling strata interface and drilling direction of prediction.
When concrete enforcement, as shown in Figure 2 quantitatively determine drill bit on drilling direction with schematic diagram by drilling strata interface distance, 201 is low-activity stratum; 202 is high radioactivity stratum; 203 is by drilling strata interface; 204 is drill collar; 205 is drill bit; 206 is upper position gamma detector; 207 is lower orientation gamma detector; 208 is drill bit at drilling direction and relative angle by drilling strata interface; 209 is boring to described during by drilling strata interface, uploads in real time gamma detector on the change point correspondence position first changing on the upper and lower orientation gamma ray curve on ground and vertical distance by drilling strata interface with boring orientation gamma ray log; 210 be drill bit on drilling direction with by the distance at drilling strata interface.If drilling direction is with known by the relative angle 208 at drilling strata interface 203, and the predeterminated position on drilling direction and described vertical distance 209 by drilling strata interface are known, can determine drill bit 205 on drilling direction with distance 210 by drilling strata interface 203.In embodiments of the present invention, bore and meet by drilling strata interface 203 at drill bit 205, while also not getting into by drilling strata interface 203, the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction be can utilize, drilling direction and relative angle 208 by drilling strata interface 203 predicted.
Concrete, obtain the process of the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction as shown in Figure 3, shown in Fig. 3 is that drill bit 205 bores upper position gamma ray curve 301 and the lower orientation gamma ray curve 302 to high radioactivity stratum 202 by low-activity stratum 201, in the time that drill bit 205 creeps in low-activity stratum 201, upper position gamma detector 206 and lower orientation gamma detector 207 are in same stratum, therefore, upper position gamma ray curve 301 and lower orientation gamma ray curve 302 overlap, in the time of drill bit 205 drilling strata interface 203, high radioactivity stratum 202 enters the investigative range of upper position gamma detector 206, upper position gamma ray curve 301 and lower orientation gamma ray curve 302 successively change, its change point first changing is respectively 303 and 304, the distance between change point 303 and 304 be exactly the change point 303 that first changes on upper position gamma ray curve 301 with lower orientation gamma ray curve 302 on the change point 304 that first the changes distance 305(on drilling direction be designated as Δ P).
The natural gamma value of the change point first changing on described upper position gamma ray curve in the specific implementation, and upper position gamma ray curve are gone forward any variable quantity of natural gamma value within the scope of the first preset value; The natural gamma value of the change point first changing on described lower orientation gamma ray curve and lower orientation gamma ray curve are gone forward any variable quantity of natural gamma value within the scope of the second preset value, described the first preset value scope be described upper position gamma ray curve go forward any natural gamma value 10% to 15%; Described the second preset value scope be described lower orientation gamma ray curve go forward any natural gamma value 10% to 15%.Up on the gamma ray curve of position, the natural gamma value of the change point first changing is with its front any variable quantity of natural gamma value within the scope of the first preset value, and this first preset value scope is 10% to 15% of this more front natural gamma value; On lower orientation gamma ray curve, before the natural gamma value of the change point first changing and its, the variable quantity of the natural gamma value of any is within the scope of the second preset value, and this second preset value scope is 10% to 15% of this more front natural gamma value.
In the process of the distance of the change point first changing on the change point first changing on acquisition upper position gamma ray curve and lower orientation gamma ray curve on drilling direction, in order to predict exactly the relative angle of drilling direction and bed boundary, in the present embodiment, set up Monte Carlo Calculation model, according to Monte Carlo Calculation modeling calculation result data, obtain the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction, and the formula of definite relative angle by drilling strata interface and drilling direction.
When concrete enforcement, adopt three-dimensional Monte Carlo Calculation model as shown in Figure 4, this Monte Carlo Calculation model adopts following setting, and the sandstone formation 401 of low-activity is for being full of the sandstone formation of fresh water in degree of porosity 15%, hole, and stratum natural gamma radioactive intensity is 0; The shale content of highly radioactive mudstone stratum 402 is 60%, the uranium that the radioactive element in stratum is 5ppm, the thorium of 10ppm and 5% potassium; Borehole diameter is 20cm, and wellbore fluid 404 is fresh water; Drill collar 405 diameters are 17.145cm, in slurry channel 406, are full of fresh water, and 407 is upper position gamma detector; 408 is lower orientation gamma detector.Be respectively 40 ° by the angle 208 changing between drilling direction and bed boundary 203 as shown in Figure 2, 50 °, 60 °, 70 °, 80 ° and 85 °, while utilizing Monte Carlo simulation calculation result data to simulate drill bit 205 to bore bed boundary 203, upper position gamma ray curve 301 as shown in Figure 3 and lower orientation gamma ray curve 302, and then in described bit drills to described during by drilling strata interface, determine the distance, delta P of the change point 304 first changing on the change point 303 that first changes on upper position gamma ray curve 301 and lower orientation gamma ray curve 302 on drilling direction.
Utilize Monte Carlo simulation calculation result data, relative angle 208 between distance, delta P and drilling direction and bed boundary 203 by the change point 304 first changing on the change point first changing on upper position gamma ray curve 301 303 and lower orientation gamma ray curve 302 on drilling direction is depicted as curve map as shown in Figure 5, wherein, the RD showing in Fig. 5 is the Circular measure value of the relative angle 208 between drilling direction and bed boundary 203, can determine the equation of the relative angle 208 between drilling direction and bed boundary 203 according to the relation curve shown in Fig. 5:
Wherein, RD is the Circular measure value of the described relative angle by drilling strata interface and drilling direction, Δ P is the change point that first changes on the change point that first changes on upper position gamma ray curve and the lower orientation gamma ray curve distance on drilling direction, and a, b, c, d are respectively constant.
After the relative angle doping by drilling strata interface and drilling direction, obtain in the present embodiment predeterminated position and the described vertical distance by drilling strata interface on drilling direction, for easy, determine exactly drill bit on drilling direction with the described distance by drilling strata interface, above-mentioned predeterminated position is to described during by drilling strata interface in described bit drills, the position of the probe in the orientation, gamma ray curve place first changing, when upper, when lower orientation gamma ray curve changes, if first there is the change point first changing in upper position gamma ray curve, this predeterminated position be upper position gamma ray curve occur first changing change point time, top is the position at gamma detector place, if first there is the change point first changing in lower orientation gamma ray curve, this predeterminated position be lower orientation gamma ray curve occur first changing change point time, below is the position at gamma detector place.As shown in Figure 2, in the time that high radioactivity stratum 202 has just entered the change point that in upper position gamma detector 206 investigative ranges, upper position gamma ray curve, first appearance changes, above-mentioned vertical distance is exactly in the upper position gamma detector 206 of this change point and vertical distance 209 by drilling strata interface 203, is called the investigation depth (being designated as DOI) of gamma ray log.
After doping by the relative angle of drilling strata interface and drilling direction, getting predeterminated position and the described vertical distance by drilling strata interface, as shown in Figure 2, can be according to the ratio of the sine value of above-mentioned vertical distance and above-mentioned relative angle, determine drill bit on drilling direction with the described distance by drilling strata interface.
When concrete enforcement, can also by following formula determine described drill bit on drilling direction with the described distance by drilling strata interface:
Wherein, L be described drill bit on drilling direction with the described distance by drilling strata interface,
the Circular measure value of the described relative angle by drilling strata interface and drilling direction, d
0be the distance between described probe and described drill bit, DOI is predeterminated position and the described vertical distance by drilling strata interface on drilling direction.
Determine drill bit on drilling direction with the described distance by drilling strata interface after, along with creeping into of drill bit, can also follow the tracks of in real time drill bit on drilling direction with the described current distance by drilling strata interface, for example, follow the tracks of described drill bit and the described distance by drilling strata interface according to described drill bit rate of penetration, concrete, can follow the tracks of described drill bit and the described distance by drilling strata interface according to following formula:
V is drill bit rate of penetration; Time after the t change point that be first drill bit change through upper position gamma ray curve 301.Show that drill bit had bored bed boundary if L ' is worth for negative, the absolute value of its value be drill bit on drilling direction with the distance of bed boundary.
Describe the above-mentioned method with determining drill bit and bed boundary distance in brill geosteering below in conjunction with specific embodiment, the method comprises the steps:
Step 1: Real-time Obtaining is with the data of boring orientation gamma ray log.
Step 2: obtain upper position gamma ray curve and lower orientation gamma ray curve in the described well-log information that uploads in real time ground.
Step 3: bit drills when by drilling strata interface, is utilized upper position gamma ray curve and lower orientation gamma ray curve in described well-log information, prediction drilling direction and by the relative angle between drilling strata interface.In the specific implementation, this relative angle is to utilize the distance of the change point first changing on the described upper position gamma ray curve with brill orientation gamma ray log and lower orientation gamma ray curve on drilling direction to obtain.
Step 4: bit drills when by drilling strata interface, obtains the gamma detector in the orientation, gamma ray curve place first changing and the vertical distance of described bed boundary.In the specific embodiment, described vertical distance is gamma ray log investigation depth.
Step 5: quantitatively determine drill bit on drilling direction with the distance of bed boundary.
Based on same inventive concept, in the embodiment of the present invention, also provide a kind of with boring the device of determining drill bit and bed boundary distance in geosteering, as described in the following examples.Because the principle with definite drill bit is dealt with problems to the device of bed boundary distance in brill geosteering is to similar to the method for bed boundary distance with definite drill bit in brill geosteering, therefore can, referring to boring the enforcement of determining the method for drill bit and bed boundary distance in geosteering, repeat part and repeat no more with the enforcement of boring the device of determining drill bit and bed boundary distance in geosteering.Following used, term " unit " or " module " can realize the combination of software and/or the hardware of predetermined function.Although the described device of following examples is preferably realized with software, hardware, or the realization of the combination of software and hardware also may and be conceived.
Fig. 6 is a kind of structured flowchart with the device of definite drill bit and bed boundary distance in brill geosteering of the embodiment of the present invention, as shown in Figure 6, comprising: angle prediction module 601, apart from acquisition module 602, apart from determination module 603, below this structure is described.
Angle prediction module 601, for Real-time Obtaining, with the data of boring orientation gamma ray log, prediction is by the relative angle of drilling strata interface and drilling direction; Apart from acquisition module 602, be connected with angle prediction module 601, for obtaining predeterminated position and the described vertical distance by drilling strata interface on drilling direction, wherein, described predeterminated position be in described bit drills to described during by drilling strata interface, the position of the probe in the orientation, gamma ray curve place first changing; Apart from determination module 603, and be connected apart from acquisition module 602, for determine according to described relative angle and described vertical distance drill bit on drilling direction with the described distance by drilling strata interface.
In one embodiment, described data comprises described upper position gamma ray curve and lower orientation gamma ray curve with boring orientation gamma ray log.
In one embodiment, described angle prediction module 601, for in described bit drills to described during by drilling strata interface, utilize the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction, the described relative angle by drilling strata interface and drilling direction of prediction.
In one embodiment, described angle prediction module 601 comprises: distance acquiring unit, be used for utilizing Monte Carlo Calculation modeling calculation result data, obtain the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction; Angle predicting unit, for determine the described relative angle by drilling strata interface and drilling direction by following formula:
wherein, RD is the Circular measure value of the described relative angle by drilling strata interface and drilling direction, Δ P is the change point that first changes on the change point that first changes on upper position gamma ray curve and the lower orientation gamma ray curve distance on drilling direction, and a, b, c, d are respectively constant.
The natural gamma value of the change point first changing on described upper position gamma ray curve in one embodiment, and upper position gamma ray curve are gone forward any variable quantity of natural gamma value within the scope of the first preset value; The natural gamma value of the change point first changing on described lower orientation gamma ray curve and lower orientation gamma ray curve are gone forward any variable quantity of natural gamma value within the scope of the second preset value.
In one embodiment, described the first preset value scope be described upper position gamma ray curve go forward any natural gamma value 10% to 15%; Described the second preset value scope be described lower orientation gamma ray curve go forward any natural gamma value 10% to 15%.
In one embodiment, described apart from determination module 603, for according to the ratio of the sine value of described vertical distance and described relative angle, determine drill bit on drilling direction with the described distance by drilling strata interface.
In one embodiment, described apart from determination module 603 by following formula determine described drill bit on drilling direction with the described distance by drilling strata interface:
wherein, described in L drill bit on drilling direction with the described distance by drilling strata interface,
the Circular measure value of the described relative angle by drilling strata interface and drilling direction, d
0be the distance between described probe and described drill bit, DOI is predeterminated position and the described vertical distance by drilling strata interface on drilling direction.
In one embodiment, in geosteering, determine that with boring the device of drill bit and bed boundary distance also comprises: track in range module, for definite drill bit on drilling direction with the described distance by drilling strata interface after, follow the tracks of described drill bit and the described distance by drilling strata interface according to described drill bit rate of penetration.
In embodiments of the present invention, data by Real-time Obtaining with brill orientation gamma ray log, predict the relative angle by drilling strata interface and drilling direction, and obtain predeterminated position and the described vertical distance by drilling strata interface on drilling direction, this predeterminated position is to described during by drilling strata interface in described bit drills, the position of the probe in the orientation, gamma ray curve place first changing, finally, according to the relative angle of prediction and the vertical distance obtained determine drill bit on drilling direction with the described distance by drilling strata interface, realize and having utilized with the data of boring orientation gamma ray log, quantitatively determine drill bit and the described distance by drilling strata interface, avoid in prior art, only whether creep into and defect that bit course is adjusted at reservoir for qualitatively judging drill bit with the data of boring orientation gamma ray log, thereby contribute to serve better geosteering with boring orientation gamma ray log.
Obviously, those skilled in the art should be understood that, each module of the above-mentioned embodiment of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that multiple calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out shown or described step with the order being different from herein, or they are made into respectively to each integrated circuit modules, or the multiple modules in them or step are made into single integrated circuit module to be realized.Like this, the embodiment of the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (18)
1. with boring a method of determining drill bit and bed boundary distance in geosteering, it is characterized in that, comprising:
Real-time Obtaining is with the data of boring orientation gamma ray log, and prediction is by the relative angle of drilling strata interface and drilling direction;
Obtain predeterminated position and the described vertical distance by drilling strata interface on drilling direction, wherein, described predeterminated position be in bit drills to described during by drilling strata interface, the position of the probe in the orientation, gamma ray curve place first changing;
According to described relative angle and described vertical distance determine described drill bit on drilling direction with the described distance by drilling strata interface.
2. as claimed in claim 1 with boring the method for determining drill bit and bed boundary distance in geosteering, it is characterized in that, described data comprises described upper position gamma ray curve and lower orientation gamma ray curve with boring orientation gamma ray log.
3. as claimed in claim 2 with boring the method for determining drill bit and bed boundary distance in geosteering, it is characterized in that, utilize the relative angle of described data prediction by drilling strata interface and drilling direction, comprising:
In described bit drills to described during by drilling strata interface, utilize the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction, the described relative angle by drilling strata interface and drilling direction of prediction.
4. as claimed in claim 3 with boring the method for determining drill bit and bed boundary distance in geosteering, it is characterized in that, utilize the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction, the described relative angle by drilling strata interface and drilling direction of prediction, comprising:
Utilize Monte Carlo Calculation modeling calculation result data, obtain the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction;
Determine the described relative angle by drilling strata interface and drilling direction by following formula:
Wherein, RD is the Circular measure value of the described relative angle by drilling strata interface and drilling direction, Δ P is the change point that first changes on the change point that first changes on upper position gamma ray curve and the lower orientation gamma ray curve distance on drilling direction, and a, b, c, d are respectively constant.
5. as claimed in claim 3 with boring the method for determining drill bit and bed boundary distance in geosteering, it is characterized in that, the natural gamma value of the change point first changing on described upper position gamma ray curve and upper position gamma ray curve are gone forward any variable quantity of natural gamma value within the scope of the first preset value;
The natural gamma value of the change point first changing on described lower orientation gamma ray curve and lower orientation gamma ray curve are gone forward any variable quantity of natural gamma value within the scope of the second preset value.
6. as claimed in claim 5 with boring the method for determining drill bit and bed boundary distance in geosteering, it is characterized in that, described the first preset value scope be described upper position gamma ray curve go forward any natural gamma value 10% to 15%;
Described the second preset value scope be described lower orientation gamma ray curve go forward any natural gamma value 10% to 15%.
As described in any one in claim 1 to 6 with boring the method for determining drill bit and bed boundary distance in geosteering, it is characterized in that, according to described relative angle and described vertical distance determine described drill bit on drilling direction with the described distance by drilling strata interface, comprising:
According to the ratio of the sine value of described vertical distance and described relative angle, determine described drill bit on drilling direction with the described distance by drilling strata interface.
8. as claimed in claim 7 with boring the method for determining drill bit and bed boundary distance in geosteering, it is characterized in that, by following formula determine described drill bit on drilling direction with the described distance by drilling strata interface:
Wherein, L be described drill bit on drilling direction with the described distance by drilling strata interface,
the Circular measure value of the described relative angle by drilling strata interface and drilling direction, d
0be the distance between described probe and described drill bit, DOI is predeterminated position and the described vertical distance by drilling strata interface on drilling direction.
As described in any one in claim 1 to 6 with boring the method for determining drill bit and bed boundary distance in geosteering, it is characterized in that, definite drill bit on drilling direction with the described distance by drilling strata interface after, also comprise:
Follow the tracks of described drill bit and the described distance by drilling strata interface according to described drill bit rate of penetration.
10. with boring a device of determining drill bit and bed boundary distance in geosteering, it is characterized in that, comprising:
Angle prediction module, for Real-time Obtaining, with the data of boring orientation gamma ray log, prediction is by the relative angle of drilling strata interface and drilling direction;
Apart from acquisition module, for obtaining predeterminated position and the described vertical distance by drilling strata interface on drilling direction, wherein, described predeterminated position be in described bit drills to described during by drilling strata interface, the position of the probe in the orientation, gamma ray curve place first changing;
Apart from determination module, for determine according to described relative angle and described vertical distance described drill bit on drilling direction with the described distance by drilling strata interface.
11. as claimed in claim 10 with boring the device of determining drill bit and bed boundary distance in geosteering, it is characterized in that, described data comprises described upper position gamma ray curve and lower orientation gamma ray curve with boring orientation gamma ray log.
12. as claimed in claim 11 with boring the device of determining drill bit and bed boundary distance in geosteering, it is characterized in that, described angle prediction module, for in described bit drills to described during by drilling strata interface, utilize the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction, the described relative angle by drilling strata interface and drilling direction of prediction.
13. as claimed in claim 12 with boring the device of determining drill bit and bed boundary distance in geosteering, it is characterized in that, described angle prediction module comprises:
Distance acquiring unit, be used for utilizing Monte Carlo Calculation modeling calculation result data, obtain the distance of the change point first changing on the change point that first changes on upper position gamma ray curve and lower orientation gamma ray curve on drilling direction;
Angle predicting unit, for determine the described relative angle by drilling strata interface and drilling direction by following formula:
Wherein, RD is the Circular measure value of the described relative angle by drilling strata interface and drilling direction, Δ P is the change point that first changes on the change point that first changes on upper position gamma ray curve and the lower orientation gamma ray curve distance on drilling direction, and a, b, c, d are respectively constant.
14. as claimed in claim 12 with boring the device of determining drill bit and bed boundary distance in geosteering, it is characterized in that, the natural gamma value of the change point first changing on described upper position gamma ray curve and upper position gamma ray curve are gone forward any variable quantity of natural gamma value within the scope of the first preset value;
The natural gamma value of the change point first changing on described lower orientation gamma ray curve and lower orientation gamma ray curve are gone forward any variable quantity of natural gamma value within the scope of the second preset value.
15. as claimed in claim 14 with boring the device of determining drill bit and bed boundary distance in geosteering, it is characterized in that, described the first preset value scope be described upper position gamma ray curve go forward any natural gamma value 10% to 15%; Described the second preset value scope be described lower orientation gamma ray curve go forward any natural gamma value 10% to 15%.
16. as described in any one in claim 10 to 15 with boring the device of determining drill bit and bed boundary distance in geosteering, it is characterized in that, described apart from determination module, for according to the ratio of the sine value of described vertical distance and described relative angle, determine described drill bit on drilling direction with the described distance by drilling strata interface.
17. as claimed in claim 16 with boring the device of determining drill bit and bed boundary distance in geosteering, it is characterized in that, described apart from determination module by following formula determine described drill bit on drilling direction with the described distance by drilling strata interface:
Wherein, L be described drill bit on drilling direction with the described distance by drilling strata interface,
the Circular measure value of the described relative angle by drilling strata interface and drilling direction, d
0be the distance between described probe and described drill bit, DOI is predeterminated position and the described vertical distance by drilling strata interface on drilling direction.
18. as described in any one in claim 10 to 15 with boring the device of determining drill bit and bed boundary distance in geosteering, it is characterized in that, also comprise:
Track in range module, for definite described drill bit on drilling direction with the described distance by drilling strata interface after, follow the tracks of described drill bit and the described distance by drilling strata interface according to described drill bit rate of penetration.
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