CN112377104B - Method and device for dynamically adjusting actual drilling track of tight sandstone gas reservoir horizontal well - Google Patents
Method and device for dynamically adjusting actual drilling track of tight sandstone gas reservoir horizontal well Download PDFInfo
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Abstract
The invention discloses a method and a device for dynamically adjusting a tight sandstone gas reservoir horizontal well drilling trajectory, wherein the method comprises the following steps: sensitive elastic parameter analysis is carried out on logging data, logging data and seismic data of the tight sandstone gas reservoir to obtain a minimum Poisson ratio parameter of the gas reservoir; establishing the space distribution of the effective reservoir of the gas reservoir according to the minimum Poisson ratio parameter of the gas reservoir; designing a horizontal section track and a target entering depth of the horizontal well according to the minimum Poisson's ratio parameter of the gas reservoir and the space distribution of the effective reservoir of the gas reservoir; and dynamically adjusting the actual drilling track of the gas reservoir horizontal well in real time according to the space distribution of the effective reservoir of the gas reservoir during the drilling process of the horizontal well according to the designed horizontal section track and the target entering depth of the horizontal well. The method can accurately establish the spatial distribution of the effective reservoir of the gas reservoir, can realize the dynamic adjustment of the actual drilling track of the horizontal well of the gas reservoir according to the spatial distribution of the effective reservoir of the gas reservoir, improves the drilling rate of the effective reservoir, and avoids the waste of drilling footage.
Description
Technical Field
The invention relates to the technical field of gas reservoir development and research, in particular to a method and a device for dynamically adjusting a compact sandstone gas reservoir horizontal well actual drilling trajectory.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
The tight sandstone gas reservoir has the characteristics of low porosity, low permeability, low pressure, low abundance, thin reservoir, quick transverse change, mutual longitudinal superposition and strong heterogeneity. In the prior art, a tight sandstone gas reservoir is usually developed by adopting a straight cluster well, but the method often causes the problems of low single-well yield, quick pressure drop, stable yield and high development difficulty. In order to efficiently exploit geological reserves, development of horizontal wells adopting large well groups and clustering is an inevitable option.
A conventional horizontal well drilling track design and real-time adjustment scheme is mainly characterized in that the space distribution of a reservoir layer at a horizontal section is presumed by means of a deposition mode established by combining deposition backgrounds and mainly relying on near-completed well logging and logging information, and the horizontal well track is adjusted in real time.
Due to the characteristics of the compact sandstone gas reservoir, the compact gas sandstone reservoir has the problems of strong heterogeneity, longitudinal mutual overlapping and transverse change of the reservoirs, very complex spatial distribution and low well control degree. When a traditional horizontal well track design and real-time guiding scheme design is adopted to drill a tight sandstone gas reservoir horizontal well in real time, the track of the horizontal well is determined by using adjacent well data and a geological model as a design basis, the track of the horizontal well is designed according to a relatively small plane, the space distribution of an effective reservoir of the gas reservoir cannot be accurately established, and the problems of low drilling rate of the effective reservoir and drilling footage waste are easily caused in the real drilling process of the tight sandstone gas reservoir horizontal well.
Disclosure of Invention
The embodiment of the invention provides a method for dynamically adjusting a compact sandstone gas reservoir horizontal well actual drilling track, which is used for improving the effective reservoir drilling rate and avoiding the waste of drilling footage, and comprises the following steps:
sensitive elastic parameter analysis is carried out on logging data, logging data and seismic data of the tight sandstone gas reservoir to obtain a minimum Poisson ratio parameter of the gas reservoir;
establishing the space distribution of the effective reservoir of the gas reservoir according to the minimum Poisson ratio parameter of the gas reservoir;
designing a horizontal section track and a target entering depth of the horizontal well according to the minimum Poisson's ratio parameter of the gas reservoir and the space distribution of the effective reservoir of the gas reservoir;
and dynamically adjusting the actual drilling track of the gas reservoir horizontal well in real time according to the space distribution of the effective reservoir of the gas reservoir in the process of drilling the horizontal well according to the designed horizontal section track and the target entry depth of the horizontal well.
The embodiment of the invention also provides a device for dynamically adjusting the actual drilling track of the tight sandstone gas reservoir horizontal well, which is used for improving the effective reservoir drilling rate and avoiding the waste of drilling footage, and comprises:
the sensitive elastic parameter analysis module is used for carrying out sensitive elastic parameter analysis on logging data, logging data and seismic data of the tight sandstone gas reservoir to obtain a minimum Poisson ratio parameter of the gas reservoir;
the space spread establishing module is used for establishing the space spread of the effective reservoir of the gas reservoir according to the minimum Poisson ratio parameter of the gas reservoir;
the horizontal well design module is used for designing a horizontal section track and a target entering depth of the horizontal well according to the minimum Poisson's ratio parameter of the gas reservoir and the space spread of the effective reservoir of the gas reservoir;
and the dynamic adjustment module is used for dynamically adjusting the actual drilling track of the gas reservoir horizontal well in real time according to the space distribution of the effective reservoir of the gas reservoir in the process of drilling the horizontal well according to the designed horizontal section track and the target entry depth of the horizontal well.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the computer program to realize the method for dynamically adjusting the tight sandstone gas reservoir horizontal well actual drilling track.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program for executing the method for dynamically adjusting the tight sandstone gas reservoir horizontal well drilling trajectory.
In the embodiment of the invention, sensitive elastic parameter analysis is carried out on logging data, logging data and seismic data of the tight sandstone gas reservoir to obtain a minimum Poisson ratio parameter of the gas reservoir; establishing the space distribution of the effective reservoir of the gas reservoir according to the minimum Poisson ratio parameter of the gas reservoir; designing a horizontal section track and a target entering depth of the horizontal well according to the minimum Poisson's ratio parameter of the gas reservoir and the space distribution of the effective reservoir of the gas reservoir; in the process of drilling a horizontal well according to the designed horizontal section track and the target entering depth of the horizontal well, the actual drilling track of the gas reservoir horizontal well is dynamically adjusted in real time according to the space distribution of the effective reservoir of the gas reservoir.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
fig. 1 is a schematic flow chart of a method for dynamically adjusting a tight sandstone gas reservoir horizontal well actual drilling trajectory in the embodiment of the invention;
FIG. 2 is a diagram illustrating an embodiment of a method for dynamically adjusting an actual drilling trajectory of a tight sandstone gas reservoir horizontal well according to the present invention;
fig. 3 is a specific example diagram of a method for dynamically adjusting an actual drilling trajectory of a tight sandstone gas reservoir horizontal well in the embodiment of the present invention;
fig. 4 is a specific example diagram of a method for dynamically adjusting an actual drilling trajectory of a tight sandstone gas reservoir horizontal well in an embodiment of the invention;
fig. 5 is a schematic structural diagram of a device for dynamically adjusting the actual drilling trajectory of a tight sandstone gas reservoir horizontal well in the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Fig. 1 is a schematic flow diagram of a method for dynamically adjusting a tight sandstone gas reservoir horizontal well actual drilling trajectory in an embodiment of the present invention, and as shown in fig. 1, the method for dynamically adjusting the tight sandstone gas reservoir horizontal well actual drilling trajectory in an embodiment of the present invention may include:
step 101: sensitive elastic parameter analysis is carried out on logging data, logging data and seismic data of the tight sandstone gas reservoir to obtain a minimum Poisson ratio parameter of the gas reservoir;
step 102: establishing the space distribution of the effective reservoir of the gas reservoir according to the minimum Poisson ratio parameter of the gas reservoir;
step 103: designing a horizontal section track and a target entering depth of the horizontal well according to the minimum Poisson's ratio parameter of the gas reservoir and the space distribution of the effective reservoir of the gas reservoir;
step 104: and dynamically adjusting the actual drilling track of the gas reservoir horizontal well in real time according to the space distribution of the effective reservoir of the gas reservoir in the process of drilling the horizontal well according to the designed horizontal section track and the target entry depth of the horizontal well.
During specific implementation, sensitive elastic parameter analysis is firstly carried out on logging data, logging data and seismic data of the tight sandstone gas reservoir to obtain a minimum Poisson ratio parameter of the gas reservoir.
In an embodiment, the method for obtaining the minimum poisson's ratio parameter of the gas reservoir by performing sensitive elastic parameter analysis on logging information, logging information and seismic information of the tight sandstone gas reservoir includes multiple methods, for example, the method may include: performing petrophysical analysis on logging information and logging information of the tight sandstone gas reservoir to determine sensitive elastic parameters of drilling; determining the sensitive elastic parameters of the gas reservoir according to the sensitive elastic parameters of the well drilling and the seismic data of the gas reservoir by AVO forward modeling and prestack AVA elastic inversion technology; performing intersection analysis on sensitive elastic parameters of the well drilling to determine the negative correlation relationship between the Poisson ratio parameters and the gas saturation; and selecting a minimum poisson ratio parameter of the gas reservoir from the sensitive elastic parameters of the gas reservoir according to the negative correlation relation between the poisson ratio parameter and the gas saturation.
In the embodiment, the cross analysis is carried out on the sensitive elastic parameters of the well drilling, and the negative correlation relationship between the Poisson ratio parameter and the gas saturation is determined; and selecting a minimum poisson ratio parameter of the gas reservoir from the sensitive elastic parameters of the gas reservoir according to the negative correlation relation between the poisson ratio parameter and the gas saturation. The cross analysis is carried out on the sensitive elastic parameters of the drilled wells, and the cross analysis result of the sensitive elastic parameters of each drilled well and the gas logging curve of the actual drilled well can obtain that when the Poisson ratio parameters are selected from the sensitive elastic parameters of a plurality of drilled wells, the gas saturation and the sensitive elastic parameters of the drilled wells have linear negative correlation, so that the minimum Poisson ratio parameter of the gas reservoir is selected from the sensitive elastic parameters of the gas reservoir, and the gas saturation of the gas reservoir can be highest.
As an example, fig. 2 is a specific example diagram of a method for dynamically adjusting an actual drilling trajectory of a tight sandstone gas reservoir horizontal well in an embodiment of the present invention, and fig. 2 is a convergence analysis diagram of a poisson's ratio parameter obtained after performing convergence analysis on a sensitive elastic parameter of a drilling well and an actual drilling gas logging curve. It can be seen from the figure that when the value of the minimum poisson's ratio parameter is less than 0.29, by linear regression, the fitting equation is as follows:
y＝-1072.3x+300.82
y: represents the gas-measured total hydrocarbon value, x: represents the poisson's ratio;
wherein R is 2 The value is 0.82345, which represents the ratio of the regression sum of squares to the longitudinal dispersion sum of squares, and the higher this ratio is, the better the model is fitted, which is generally considered to be higher than 0.8.
Thus from the fitting equation and R 2 And analyzing that the gas saturation and the minimum poisson ratio parameter form a linear negative correlation relationship, so that the gas saturation is higher when the value of the poisson ratio parameter is smaller.
In an embodiment, performing petrophysical analysis on logging information and logging information of the tight sandstone gas reservoir to determine sensitive elastic parameters of a drilled well may include: performing rock physical analysis on logging information and logging information of the tight sandstone gas reservoir, and preferably selecting elastic parameters sensitive to the tight sandstone gas reservoir; wherein the elastic parameters sensitive to tight sand gas reservoirs may include: gamma parameter, wave length difference parameter, density, and other electric parameters and physical parameters; establishing a tight sandstone gas reservoir rock physical model according to elastic parameters sensitive to the tight sandstone gas reservoir; determining sensitive elastic parameters of a drilling well according to the established compact sandstone gas reservoir rock physical model; sensitive elastic parameters of the well bore can include elastic parameters such as longitudinal wave impedance, transverse wave impedance and minimum Poisson's ratio.
In an embodiment, there are a plurality of methods for determining the sensitive elastic parameters of the gas reservoir from the sensitive elastic parameters of the well and the seismic data of the gas reservoir by AVO (Amplitude Variation with offset) forward and pre-stack AVA (Amplitude Variation with Angle of incidence) elastic inversion techniques, for example, may include: performing AVO forward modeling on the sensitive elastic parameters of the well drilling to determine the AVO response characteristics of the gas reservoir; and according to the AVO response characteristics of the gas reservoir, performing prestack AVA elastic inversion on the seismic data of the gas reservoir to obtain sensitive elastic parameters of the gas reservoir.
In the above embodiment, AVO forward modeling is performed on the sensitive elastic parameters of the drilling well, the AVO response characteristics of the gas reservoir are determined, and the AVO abnormal type of the tight sandstone gas reservoir is determined through the AVO forward modeling, which is helpful for technicians in the field to qualitatively judge the gas saturation degree of the reservoir by using the abnormal type, for example, the AVO abnormal type of the tight sandstone gas reservoir in the deldos basin can be determined as a type III abnormality through the AVO forward modeling; and then, according to the AVO response characteristics of the gas reservoir, performing prestack AVA elastic inversion on the seismic data of the gas reservoir to obtain sensitive elastic parameters of the gas reservoir. The prestack AVA elastic inversion is to utilize the superposed data and well logging data of CRP angle gathers (common reflection point gathers) after prestack offset, and to obtain sensitive elastic parameters of the gas reservoir by joint inversion with Zoeppritz's equation as a theoretical basis, such as longitudinal wave impedance, transverse wave impedance, minimum Poisson's ratio and other rock physical elastic parameters, so as to comprehensively judge properties such as lithology, physical properties, gas content and the like of the tight sandstone gas reservoir.
During specific implementation, sensitive elastic parameter analysis is carried out on logging data, logging data and seismic data of the tight sandstone gas reservoir to obtain a minimum poisson ratio parameter of the gas reservoir, and then spatial distribution of an effective reservoir of the gas reservoir is established according to the minimum poisson ratio parameter of the gas reservoir.
In the embodiment, the space distribution of the effective reservoir of the gas reservoir is established according to the minimum Poisson ratio parameter of the gas reservoir, and the space distribution form of the effective reservoir is precisely and quantitatively depicted by utilizing the correlation between the minimum Poisson ratio and the effective reservoir.
In the embodiment, the space distribution of the effective gas reservoir is established, so that the horizontal section track and the target entering depth of the horizontal well can be designed according to the minimum Poisson's ratio parameter of the gas reservoir and the space distribution of the effective gas reservoir in the subsequent steps, and the actual drilling track of the horizontal well of the gas reservoir can be dynamically adjusted in real time.
During specific implementation, after the spatial distribution of the gas reservoir effective reservoir is established according to the minimum poisson ratio parameter of the gas reservoir, the horizontal section track and the target entering depth of the horizontal well are designed according to the minimum poisson ratio parameter of the gas reservoir and the spatial distribution of the gas reservoir effective reservoir.
In an embodiment, according to the minimum poisson's ratio parameter of the gas reservoir and the spatial distribution of the effective reservoir of the gas reservoir, there are various methods for designing the target entry depth of the horizontal well, for example, the methods may include: determining the spread of small layers and sandstone groups of the gas reservoir according to the spatial spread of the effective reservoir of the gas reservoir; and designing the target penetration depth of the horizontal well according to the comparison result of the minimum Poisson's ratio parameter of the gas reservoir and the spreading of the small layer and the sandstone group of the gas reservoir.
In the above embodiment, the target penetration depth is designed by using the control well logging data and the logging data and by using the minimum poisson's ratio parameter to finely compare the spreading of the small sandstone groups. Because the reservoir has strong heterogeneity and fast change, in the process of actually drilling into the target, early warning is made for the target point in advance or in delay, and corresponding target point adjustment countermeasures are made; according to the minimum Poisson ratio parameter, the space distribution form of the effective reservoir is described, the target entering depth is predicted, the track of the horizontal section is designed, early warning is given to the lithologic mutation position and the micro-amplitude structural change area in advance, and the most effective track design is achieved.
During specific implementation, after a horizontal section track and a target entering depth of the horizontal well are designed according to the minimum Poisson's ratio parameter of the gas reservoir and the spatial distribution of the effective reservoir of the gas reservoir, in the process of drilling the horizontal well according to the designed horizontal section track and the target entering depth of the horizontal well, the actual drilling track of the horizontal well of the gas reservoir is dynamically adjusted in real time according to the spatial distribution of the effective reservoir of the gas reservoir.
In an embodiment, in the process of drilling a horizontal well according to a designed horizontal section track and a target entry depth of the horizontal well, various methods for dynamically adjusting a real drilling track of the gas reservoir horizontal well in real time according to a space distribution of an effective reservoir of the gas reservoir are provided, for example, the methods may include: determining a risk geological region of the gas reservoir according to the space distribution of the effective reservoir of the gas reservoir; the risk geological region comprises a lithologic change region, a horizontal section structure fluctuation point region and a horizontal section sand body superposition and transverse thickness change point; in the process of drilling the horizontal well according to the designed horizontal section track and the target entering depth of the horizontal well, before encountering a risk geological region of a gas reservoir, the actual drilling track of the gas reservoir horizontal well is dynamically adjusted by adjusting the angle of a drilling machine in real time.
In the embodiment, a risk geological region of the gas reservoir is determined according to the spatial distribution of the effective reservoir of the gas reservoir, wherein the risk geological region comprises a lithologic change region, a horizontal section structure fluctuation point region and a horizontal section sand body superposition and transverse thickness change point; according to the effective reservoir space distribution form described by the minimum Poisson ratio attribute, before encountering a risk geological region of the gas reservoir, a corresponding horizontal section track adjustment strategy is formulated, the drilling machine angle is adjusted in real time, the actual drilling track of the gas reservoir horizontal well is dynamically adjusted, the optimal track guidance of the horizontal section is realized, the ineffective drilling footage is reduced, and the effective reservoir drilling rate is improved.
In the above embodiment, 1, when the encountered risk geological region is a lithologic change region, pre-drilling early warning is firstly performed: utilizing the minimum Poisson ratio attribute, enabling the transverse development of the river channel sand body to be discontinuous, and early warning the lithologic mutation position of the horizontal section; in the process of horizontal well drilling, logging data and logging data are tracked and updated in real time, and lithological change characteristics are confirmed and monitored in time; through real-time adjustment rig angle, carry out dynamic adjustment to the real orbit of boring of gas reservoir horizontal well, include: and (4) adjusting the drilling angle in time according to the effective reservoir space distribution form predicted by the minimum Poisson's ratio attribute, crossing the mudstone section between the river channels and searching for a replacement reservoir.
2. When the risk geological region that meets is horizontal segment structure fluctuation point region, at first carry out the early warning before boring: according to the spatial distribution of the effective reservoir of the gas reservoir, early warning the structural fluctuation points of the horizontal section; in the process of drilling a horizontal well, before actually drilling to a structural change point, confirming a micro-amplitude structural fluctuation point, and drilling according to the inclination angle of two wings of the micro-amplitude structure; through real-time adjustment rig angle, carry out dynamic adjustment to the real orbit of boring of gas reservoir horizontal well, include: and drilling along the micro-amplitude structure trend, adjusting the well track in time and improving the effective reservoir drilling rate.
3. When the risk geological domain that meets is horizontal segment sand body superpose and horizontal thickness change point, at first carry out the early warning before boring: according to the effective reservoir space distribution form predicted by the minimum Poisson ratio attribute, early warning horizontal sand bodies possibly overlap with each other or transverse thickness change points; in the process of drilling a horizontal well, before the horizontal well is actually drilled to a reservoir thickness change point, tracking and updating logging data in real time, and confirming and monitoring the reservoir thickness change trend in time; through real-time adjustment rig angle, carry out dynamic adjustment to the gas reservoir horizontal well real orbit of boring, include: drilling along the variation trend of the thickness of the reservoir, adjusting the track among layers, and returning the reservoir in time, thereby improving the effective reservoir drilling rate.
As an example, fig. 3 is a specific example diagram of a method for dynamically adjusting an actual drilling trajectory of a tight sandstone gas reservoir horizontal well in an embodiment of the present invention, and as shown in fig. 3, for 3 geological risks (lithologic change area, horizontal segment structure fluctuation point area, horizontal segment sand body superposition and horizontal thickness change point) existing in a drilling water horizontal segment, according to an effective reservoir space distribution form described by a minimum poisson ratio attribute, corresponding technical countermeasures such as pre-drilling early warning, drilling time confirmation and adjustment methods are formulated, and real-time precise and accurate measurement is performedFine tracking and track adjustment are performed, invalid footage is reduced, and the effective reservoir drilling rate is improved. In fig. 3, first, a minimum poisson ratio parameter of the gas reservoir is obtained through calculation, and a spatial distribution of an effective reservoir of the gas reservoir is established according to the minimum poisson ratio parameter of the gas reservoir; designing the target entry depth of the horizontal well according to the minimum Poisson ratio parameter of the gas reservoir and the space distribution of the effective reservoir of the gas reservoir, so as to realize accurate target entry guiding of the horizontal well; meanwhile, due to the fact that the reservoir is strong in heterogeneity and quick in change, logging information is comprehensively utilized in the process of drilling, a marker layer is judged and a small sandstone group is finely compared depending on the minimum Poisson ratio property, early warning is made in advance or later for a target point, and a corresponding target point adjusting strategy is made. Like Jing 72-65H2 in Jing 72-65 well-connected GR curve (natural gamma curve) sublayer contrast, jing 72-65 well box 8 Lower part Reservoir sand top (natural gamma curve is small to left, representing sand body development, high to right, representing mudstone development) is 2900 meters deep (well head complement elevation + layer elevation), jing 72-65H2 is set with sand body top at 2893 meters deep, and the well is designed with target depth of 2911 meters; and by combining with the analysis of the minimum Poisson ratio attribute section of the gas reservoir, the relative ratio of the minimum Poisson ratio attribute section of the gas reservoir is consistent with that of a small layer of sand body of a control well, the fact that the drilling is carried out in advance on a target layer (the sand body below a box 8) is found, and the earthquake prediction target entering depth is 2903 meters, so that the engineering parameter is adjusted to increase the slant drilling, and the drilling is carried out in the target 8m in longitudinal advance compared with the original design parameter. Similarly, when a Jing 72-57H1 well is drilled, through the analysis of a small layer contrast and a minimum Poisson ratio attribute profile, the upper part of a sand body at the original design target position of the Jing 72-57H1 does not grow, engineering parameters are immediately adjusted to drill steadily, 10m of target entering is delayed, the target entering is finally performed with a vertical depth of 2902m, and both wells obtain better drilling effects.
Fig. 4 is a specific illustration of a method for dynamically adjusting an actual drilling trajectory of a tight sandstone gas reservoir horizontal well in an embodiment of the present invention, and as shown in fig. 4, for 3 geological risks (lithologic change area, horizontal section structure fluctuation point area, horizontal section sand body superposition and transverse thickness change point) existing in a drilling water horizontal section, according to an effective reservoir space distribution form described by a minimum poisson ratio attribute, corresponding technical countermeasures such as pre-drilling early warning, drilling time confirmation and an adjustment method are formulated, such that real-time fine tracking, trajectory adjustment, invalid footage reduction and effective reservoir drilling rate increase are performed. In fig. 4, first, a minimum poisson ratio parameter of the gas reservoir is calculated, and a spatial distribution of an effective reservoir of the gas reservoir is established according to the minimum poisson ratio parameter of the gas reservoir; and adjusting the horizontal section track of the horizontal well in real time according to the minimum Poisson ratio parameter of the gas reservoir and the space distribution of the effective reservoir of the gas reservoir, so as to realize the optimal track guidance of the horizontal section. Aiming at 3 geological risks existing in the drilling water horizontal section, the effective reservoir space distribution form is described according to the minimum Poisson ratio attribute, the earthquake and the geology are integrated, the advantages and the disadvantages are made up, corresponding horizontal section track adjustment countermeasures are made, and real-time fine tracking is carried out. (1) Lithology change and trajectory adjustment (lateral exit through the channel): utilizing the minimum Poisson ratio attribute, enabling the transverse development of the river channel sand body to be discontinuous, and early warning the lithologic mutation position of the horizontal section; tracking and updating logging data in real time, and confirming and monitoring lithology change characteristics in time; adjusting the drilling angle in time according to the effective reservoir space distribution form predicted by the minimum Poisson's ratio attribute, traversing the mudstone section between the riverways, and searching for a replacement reservoir; as shown in the lower left Jing 72-60H1 well of FIG. 4, a target reservoir 130 meters after the target is entered becomes thinner, the gamma curve value is increased, the gas logging is reduced (the position is shown by a vertical line), the target reservoir is developed, the situation is opposite to the actual drilling situation by comparing with the pilot hole Jing 72-60 small layer, but from the Poisson ratio profile analysis, the target reservoir is already faded, the top reservoir is developed, the gas content is good, and therefore 91-degree deviation-increasing drilling is recommended to search for an alternate horizon. Finally, after drilling in a mudstone section with the depth of 430 meters and rising by 11 meters, smoothly drilling in a high-quality reservoir, drilling the whole horizontal section with the length of 1654 meters, sandstone drilling rate of 61.5%, air bed length of 1018m, air bed drilling rate of 61.5%, earthquake minimum Poisson ratio prediction coincidence rate of 95.8%, and testing unobstructed flow rate of 217.41 million square/day. (2) adjusting the drilling encounter micro amplitude and track: observing the structural form of the effective reservoir predicted by the minimum Poisson ratio attribute, and early warning the structural fluctuation points of the horizontal section; before actually drilling to a structural change point, confirming a micro-amplitude structural fluctuation point, and drilling according to the inclination angle of the two wings of the micro-amplitude structure; and drilling along the micro-amplitude structure trend, adjusting the well track in time and improving the effective reservoir drilling rate. As shown in the lower part of FIG. 4, the well Jing 77-63H1, and the pilot well Jing Yu 34, G2-17 well stratums are compared and analyzed, the target reservoir develops, and the monoclinic augmentations are constructed. However, when the reservoir stratum enters the horizontal section position of 320 meters behind the target, the gamma curve value is increased, the gas logging is reduced (the range shown by the vertical line of the figure), and the micro-amplitude structure of the target reservoir stratum is raised from the Poisson ratio profile analysis, so that the gas bearing performance is good, therefore, the 90.5-91-degree inclined drilling is recommended, and the reservoir stratum can be smoothly returned after the drilling meets 150 mudstones and the vertical depth is increased by 1.56 meters. The final horizontal section length of the well is 2000m, the sandstone length is 1836m, the sandstone drilling rate is 91.8%, the effective reservoir length is 1733m, the effective reservoir drilling rate is 86.65%, and the minimum Poisson ratio prediction coincidence rate of earthquake is 93.19%. (3) drilling out the top or the bottom of the sand body and adjusting the track: according to the effective reservoir space distribution form predicted by the minimum Poisson ratio attribute, early warning horizontal sand bodies possibly overlap with each other or transverse thickness change points; before the actual drilling reaches the reservoir thickness change point, the logging data is tracked and updated in real time, and the reservoir thickness change trend is confirmed and monitored in time; drilling along the variation trend of the thickness of the reservoir, adjusting the track between layers, returning the reservoir in time and improving the effective reservoir drilling rate. As shown in the lower right of FIG. 4, the wells Jing 66-55H2, compared with the well stratums of the pilot well Jing G1-17 and the well Jing 72-58, have the target reservoir developed and the structure is relatively gentle. However, when the horizontal section position is 248 meters after the target, the gamma curve value is increased, the gas logging is reduced (the position is shown by a vertical line in the figure), and the target reservoir does not develop and has poor gas bearing property through Poisson ratio profile analysis, so that 89.5-degree inclined drilling is recommended, and the reservoir can be smoothly returned after the drilling meets 250 meters of mudstone and the vertical depth is reduced by 2.16 meters. The final horizontal section length of the well is 1975m, the sandstone length is 1567m, the sandstone drilling rate is 79.34%, the effective reservoir length is 1441m, the effective reservoir drilling rate is 72.96%, and the minimum earthquake Poisson ratio prediction coincidence rate is 92.91%. Therefore, corresponding adjustment schemes are formulated in real time aiming at pre-drilling early warning and diamond analysis of multiple geological risks encountered during drilling, optimal track guidance of a horizontal section is achieved, invalid footage is reduced, and the effective reservoir drilling rate is greatly improved.
A specific example is given below to illustrate a specific application of the method of the present invention.
If the location of the work area of the tight sandstone gas reservoir is in the south east of Su of Ordos basin, rock physics modeling and elastic parameter intersection analysis are firstly carried out on wide-azimuth and high-density three-dimensional seismic data of 8 sections of the tight sandstone gas reservoir box, so that the negative correlation relationship between the minimum Poisson ratio and the gas saturation can be obtained, and therefore, the effective reservoir stratum can be quantitatively identified by using the minimum Poisson ratio parameter. Therefore, by means of three-dimensional seismic data, through the AVO analysis of the angle-divided superposition data and the pre-stack AVA elastic inversion, multiple rock physical elastic parameters such as longitudinal wave velocity, transverse wave velocity, density and minimum Poisson ratio parameters are obtained, further, effective reservoir space distribution forms are accurately described by using the minimum Poisson ratio attribute, a production target area is comprehensively evaluated, horizontal wells are deployed in a clustered mode, horizontal well tracks are designed by combining the reservoir space distribution, the tracks are adjusted in real time according to the drilling machine condition, meanwhile, the drilling machine deployment is optimized according to the well field condition, the effective reservoir drilling rate of the horizontal wells is improved, the working efficiency is improved, and the practical application effect is good.
In the embodiment, the most effective track can be designed and the precise target-entering guidance can be realized by optimizing the favorable area and deploying 46 horizontal wells, the horizontal section is used for precisely tracking the 46 horizontal wells in real time, the average horizontal section is 1420m long, the average sandstone drilling rate is 85.1 percent, and the average effective reservoir drilling rate is 70.1 percent, compared with a method for adjusting the compact sandstone gas reservoir horizontal well actual drilling track in the prior art, the method can be improved by 10.1 percent on the same scale, so that the effective reservoir drilling rate is improved, and the waste of drilling footage is avoided.
In the embodiment of the invention, sensitive elastic parameter analysis is carried out on logging data, logging data and seismic data of the tight sandstone gas reservoir to obtain a minimum Poisson ratio parameter of the gas reservoir; establishing the space distribution of the effective reservoir of the gas reservoir according to the minimum Poisson ratio parameter of the gas reservoir; designing a horizontal section track and a target entering depth of the horizontal well according to the minimum Poisson's ratio parameter of the gas reservoir and the space distribution of the effective reservoir of the gas reservoir; in the process of drilling a horizontal well according to the designed horizontal section track and the target entering depth of the horizontal well, the actual drilling track of the gas reservoir horizontal well is dynamically adjusted in real time according to the space distribution of the effective reservoir of the gas reservoir.
As described above, the method for dynamically adjusting the actual drilling trajectory of the tight sandstone gas reservoir horizontal well provided by the embodiment of the invention is simple to operate, has strong instructive property and good effect, obtains considerable production benefit and economic benefit, and fully proves the feasibility and practicability of the method.
The embodiment of the invention also provides a device for dynamically adjusting the actual drilling track of the tight sandstone gas reservoir horizontal well, which is described in the following embodiment. The principle of solving the problems by the device is similar to the method for dynamically adjusting the actual drilling trajectory of the tight sandstone gas reservoir horizontal well, so that the implementation of the device can refer to the implementation of the method for dynamically adjusting the actual drilling trajectory of the tight sandstone gas reservoir horizontal well, and repeated parts are not repeated.
Fig. 5 is a schematic structural diagram of a device for dynamically adjusting a tight sandstone gas reservoir horizontal well actual drilling trajectory in the embodiment of the present invention, and as shown in fig. 5, the device for dynamically adjusting a tight sandstone gas reservoir horizontal well actual drilling trajectory in the embodiment of the present invention may include:
the sensitive elastic parameter analysis module 01 is used for carrying out sensitive elastic parameter analysis on logging data, logging data and seismic data of the tight sandstone gas reservoir to obtain a minimum Poisson ratio parameter of the gas reservoir;
the space spread establishing module 02 is used for establishing the space spread of the effective reservoir of the gas reservoir according to the minimum Poisson ratio parameter of the gas reservoir;
the horizontal well design module 03 is used for designing a horizontal section track and a target entering depth of the horizontal well according to the minimum Poisson's ratio parameter of the gas reservoir and the spatial distribution of the effective reservoir of the gas reservoir;
and the dynamic adjustment module 04 is used for dynamically adjusting the actual drilling track of the gas reservoir horizontal well in real time according to the spatial distribution of the effective reservoir of the gas reservoir in the process of drilling the horizontal well according to the designed horizontal section track and the target entering depth of the horizontal well.
In one embodiment, the sensitive elastic parameter analysis module is specifically configured to: performing petrophysical analysis on logging information and logging information of the tight sandstone gas reservoir to determine sensitive elastic parameters of drilling; determining the sensitive elastic parameters of the gas reservoir according to the sensitive elastic parameters of the well drilling and the seismic data of the gas reservoir by AVO forward modeling and prestack AVA elastic inversion technology; performing intersection analysis on sensitive elastic parameters of the well drilling to determine the negative correlation relationship between the Poisson ratio parameters and the gas saturation; and selecting a minimum poisson ratio parameter of the gas reservoir from the sensitive elastic parameters of the gas reservoir according to the negative correlation relation between the poisson ratio parameter and the gas saturation.
In one embodiment, the sensitive elastic parameter analysis module is specifically configured to: performing AVO forward modeling on the sensitive elastic parameters of the well drilling to determine the AVO response characteristics of the gas reservoir; and performing prestack AVA elastic inversion on seismic data of the gas reservoir according to the AVO response characteristics of the gas reservoir to obtain sensitive elastic parameters of the gas reservoir.
In one embodiment, the horizontal well design module is specifically configured to: determining the spreading of small layers and sandstone groups of the gas reservoir according to the spatial spreading of the effective reservoir of the gas reservoir; and designing the target penetration depth of the horizontal well according to the comparison result of the minimum Poisson's ratio parameter of the gas reservoir and the spreading of the small layer and the sandstone group of the gas reservoir.
In an embodiment, the dynamic adjustment module is specifically configured to: determining a risk geological region of the gas reservoir according to the spatial distribution of the effective reservoir of the gas reservoir; the risk geological region comprises a lithologic change region, a horizontal section structure fluctuation point region and a horizontal section sand body superposition and transverse thickness change point; in the process of drilling the horizontal well according to the designed horizontal section track and the target entering depth of the horizontal well, before encountering a risk geological region of a gas reservoir, the actual drilling track of the gas reservoir horizontal well is dynamically adjusted by adjusting the angle of a drilling machine in real time.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, wherein the processor executes the computer program to realize the method for dynamically adjusting the tight sandstone gas reservoir horizontal well actual drilling track.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program for executing the method for dynamically adjusting the tight sandstone gas reservoir horizontal well drilling trajectory.
In the embodiment of the invention, sensitive elastic parameter analysis is carried out on logging data, logging data and seismic data of the tight sandstone gas reservoir to obtain a minimum Poisson ratio parameter of the gas reservoir; establishing the space distribution of the effective reservoir of the gas reservoir according to the minimum Poisson ratio parameter of the gas reservoir; designing a horizontal section track and a target entering depth of the horizontal well according to the minimum Poisson's ratio parameter of the gas reservoir and the space distribution of the effective reservoir of the gas reservoir; in the process of drilling the horizontal well according to the designed horizontal section track and the target entry depth of the horizontal well, the actual drilling track of the gas reservoir horizontal well is dynamically adjusted in real time according to the space distribution of the effective gas reservoir, compared with the prior art, the space distribution of the effective gas reservoir is established according to the minimum poisson's ratio parameter of the gas reservoir, the space distribution of the effective gas reservoir can be accurately established, the dynamic adjustment of the actual drilling track of the gas reservoir horizontal well can be realized according to the space distribution of the effective gas reservoir, the drilling rate of the effective reservoir is improved, and the waste of drilling footage is avoided.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method for dynamically adjusting a tight sandstone gas reservoir horizontal well actual drilling track is characterized by comprising the following steps:
sensitive elastic parameter analysis is carried out on logging data, logging data and seismic data of the tight sandstone gas reservoir to obtain a minimum Poisson ratio parameter of the gas reservoir;
establishing the space distribution of the effective reservoir of the gas reservoir according to the minimum Poisson ratio parameter of the gas reservoir;
designing a horizontal section track and a target entering depth of the horizontal well according to the minimum Poisson's ratio parameter of the gas reservoir and the space distribution of the effective reservoir of the gas reservoir;
in the process of drilling a horizontal well according to the designed horizontal section track and the target entering depth of the horizontal well, dynamically adjusting the actual drilling track of the gas reservoir horizontal well in real time according to the space distribution of the effective reservoir of the gas reservoir;
sensitive elastic parameter analysis is carried out on logging information, logging information and seismic information of the tight sandstone gas reservoir to obtain a minimum Poisson ratio parameter of the gas reservoir, and the method comprises the following steps:
performing rock physical analysis on logging information and logging information of the tight sandstone gas reservoir to determine sensitive elastic parameters of drilling;
determining the sensitive elastic parameters of the gas reservoir according to the sensitive elastic parameters of the well drilling and the seismic data of the gas reservoir by AVO forward modeling and prestack AVA elastic inversion technology;
performing intersection analysis on sensitive elastic parameters of the well drilling to determine the negative correlation relationship between the Poisson ratio parameters and the gas saturation;
and selecting a minimum poisson ratio parameter of the gas reservoir from the sensitive elastic parameters of the gas reservoir according to the negative correlation relation between the poisson ratio parameter and the gas saturation.
2. The method of claim 1, wherein determining the sensitive elastic parameters of the gas reservoir from the sensitive elastic parameters of the well and seismic data of the gas reservoir by AVO forward and prestack AVA elastic inversion techniques comprises:
performing AVO forward modeling on the sensitive elastic parameters of the well drilling to determine the AVO response characteristics of the gas reservoir;
and according to the AVO response characteristics of the gas reservoir, performing prestack AVA elastic inversion on the seismic data of the gas reservoir to obtain sensitive elastic parameters of the gas reservoir.
3. The method of claim 1, wherein designing the target entry depth of the horizontal well according to the minimum poisson's ratio parameter of the gas reservoir and the spatial distribution of the effective reservoir of the gas reservoir comprises:
determining the spread of small layers and sandstone groups of the gas reservoir according to the spatial spread of the effective reservoir of the gas reservoir;
and designing the target penetration depth of the horizontal well according to the comparison result of the minimum Poisson's ratio parameter of the gas reservoir and the spreading of the small layer and the sandstone group of the gas reservoir.
4. The method of claim 1, wherein during the process of drilling the horizontal well according to the designed horizontal section track and the target entry depth of the horizontal well, the real drilling track of the gas reservoir horizontal well is dynamically adjusted in real time according to the spatial distribution of the effective reservoir of the gas reservoir, and the method comprises the following steps:
determining a risk geological region of the gas reservoir according to the space distribution of the effective reservoir of the gas reservoir; the risk geological region comprises a lithologic change region, a horizontal section structure fluctuation point region and a horizontal section sand body superposition and transverse thickness change point;
in the process of drilling the horizontal well according to the designed horizontal section track and the target entering depth of the horizontal well, before encountering a risk geological region of a gas reservoir, dynamically adjusting the actual drilling track of the gas reservoir horizontal well by adjusting the angle of a drilling machine in real time.
5. The utility model provides a device of tight sandstone gas reservoir horizontal well real drilling track of dynamic adjustment which characterized in that includes:
the sensitive elastic parameter analysis module is used for carrying out sensitive elastic parameter analysis on logging data, logging data and seismic data of the tight sandstone gas reservoir to obtain a minimum Poisson ratio parameter of the gas reservoir;
the space spread establishing module is used for establishing the space spread of the effective reservoir of the gas reservoir according to the minimum Poisson ratio parameter of the gas reservoir;
the horizontal well design module is used for designing a horizontal section track and a target entering depth of the horizontal well according to the minimum Poisson's ratio parameter of the gas reservoir and the space spread of the effective reservoir of the gas reservoir;
the dynamic adjustment module is used for dynamically adjusting the actual drilling track of the gas reservoir horizontal well in real time according to the space distribution of the effective reservoir of the gas reservoir in the process of drilling the horizontal well according to the designed horizontal section track and the target entry depth of the horizontal well;
the sensitive elastic parameter analysis module is specifically used for:
performing petrophysical analysis on logging information and logging information of the tight sandstone gas reservoir to determine sensitive elastic parameters of drilling;
determining the sensitive elastic parameters of the gas reservoir according to the sensitive elastic parameters of the well drilling and the seismic data of the gas reservoir by AVO forward modeling and prestack AVA elastic inversion technology;
performing intersection analysis on sensitive elastic parameters of the well drilling to determine the negative correlation relationship between the Poisson ratio parameters and the gas saturation;
and selecting a minimum poisson ratio parameter of the gas reservoir from the sensitive elastic parameters of the gas reservoir according to the negative correlation relation between the poisson ratio parameter and the gas saturation.
6. The apparatus of claim 5, wherein the sensitive elasticity parameter analysis module is specifically configured to:
performing AVO forward modeling on the sensitive elastic parameters of the well drilling to determine the AVO response characteristics of the gas reservoir;
and according to the AVO response characteristics of the gas reservoir, performing prestack AVA elastic inversion on the seismic data of the gas reservoir to obtain sensitive elastic parameters of the gas reservoir.
7. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 4 when executing the computer program.
8. A computer-readable storage medium, characterized in that it stores a computer program for performing the method of any of claims 1 to 4.
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