CN112746832B - Horizontal well spacing optimization method based on horizontal well post-fracturing coring analysis - Google Patents
Horizontal well spacing optimization method based on horizontal well post-fracturing coring analysis Download PDFInfo
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Abstract
The invention provides an optimization method of horizontal well cloth well spacing based on core analysis after horizontal well fracturing, which comprises the following steps: stress parameter data of a target work area is obtained, wherein the stress parameter data comprise the minimum horizontal main stress direction; obtaining the horizontal well distribution interval of two horizontal wells according to the estimated fracturing crack parameters and the minimum horizontal main stress direction during target block reservoir reconstruction, so as to drill wells according to the horizontal well distribution interval and fracture the two drilled target horizontal wells by utilizing a preset fracturing scheme; acquiring a well track and coring parameters of a coring well according to the positions of two target horizontal wells, the minimum horizontal main stress direction and a preset fracturing scheme, performing well drilling and coring according to the well track and the coring parameters, and measuring the crack parameters of the extracted cores to obtain the spatial distribution condition of hydraulic cracks of a target work area; according to the hydraulic fracture space spreading condition of the target working area, the horizontal well distribution distance of the subsequent well drilling of the target working area is optimized, and the rationality of well distribution of the working area is improved.
Description
Technical Field
The invention relates to the technical field of oil and gas well production transformation, in particular to a horizontal well spacing optimization method and device based on core analysis after horizontal well fracturing.
Background
At present, the hydraulic fracturing technology has become an indispensable production increasing means for a three-low oil and gas reservoir, the hydraulic fracture space distribution is accurately obtained in hydraulic fracturing, and the horizontal well distribution interval of a work area is optimized according to the hydraulic fracture space distribution, so that the hydraulic fracture space distribution is very important to improve the productivity of the work area.
The crack monitoring technology is an important means for obtaining the hydraulic crack expansion rule, and at present, the hydraulic crack on-site monitoring method comprises three steps: 1. the indirect monitoring method comprises the following steps: the method mainly comprises the steps of net pressure analysis, well test and production analysis, and has the main defects that analysis results are always non-unitary and need to be corrected by using direct fracture monitoring results; 2. direct monitoring near the wellbore: the method comprises the steps of radioactive tracer, temperature logging, production logging, borehole diameter measurement and the like, and has the main defects that fracture parameters within 1m near a shaft can be obtained only; 3. direct far field monitoring: the method comprises a ground inclinometer, an underground inclinometer and a microseism technology, wherein a far field monitoring technology monitors from a near well or the ground, and can obtain the expansion of cracks in the far field. However, with the increasing of the awareness level, the three techniques have poor effects in accurately describing the length, the width and the like of the crack, and directly influence the rationality of well arrangement, thereby influencing the productivity of a work area.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method and a device for optimizing the well spacing of a horizontal well based on core analysis after fracturing of the horizontal well, electronic equipment and a computer readable storage medium, which can at least partially solve the problems in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, a method for optimizing horizontal well cloth well spacing based on post-fracturing coring analysis of a horizontal well is provided, comprising:
obtaining stress parameter data of a target work area, wherein the stress parameter data comprises a minimum horizontal main stress direction;
obtaining the horizontal well spacing of two horizontal wells according to the estimated fracturing fracture parameters and the minimum horizontal main stress direction during the reservoir reconstruction of the target block, so as to drill wells according to the horizontal well spacing and fracture the two drilled target horizontal wells by utilizing a preset fracturing scheme;
acquiring a well track and coring parameters of a coring well according to the positions of two target horizontal wells, the minimum horizontal main stress direction and the preset fracturing scheme, performing well drilling and coring according to the well track and the coring parameters, and measuring the crack parameters of the extracted cores to obtain the spatial spreading condition of hydraulic cracks of the target work area;
And optimizing the horizontal well distribution distance of the subsequent well drilling of the target work area according to the spatial distribution condition of the hydraulic fracture of the target work area.
Further, the stress parameter data further includes: a maximum horizontal principal stress direction;
the optimization method of the horizontal well spacing based on the horizontal well post-fracturing coring analysis further comprises the following steps:
and acquiring the estimated fracture parameters according to the pre-compression evaluation data and the maximum horizontal main stress direction.
Further, the method further comprises the following steps:
and acquiring the estimated fracture parameters according to the historical fracture data of the target block.
Further, the method further comprises the following steps:
acquiring logging data of the target work area;
and interpreting the stress parameter data according to the logging data.
Further, the method further comprises the following steps:
and acquiring pre-press evaluation data of the target work area.
Further, the pre-press evaluation data includes: reservoir parameters, wellbore parameters, rock mechanical parameters, and fracturing fluid properties parameters.
Further, the fracture parameters include: average fracture length, average fracture width, and average fracture height.
In a second aspect, an optimizing apparatus for horizontal well cloth well spacing based on post-fracturing coring analysis of a horizontal well is provided, including:
The stress parameter data acquisition module acquires stress parameter data of a target work area, wherein the stress parameter data comprises a minimum horizontal main stress direction;
the horizontal well distribution interval acquisition module acquires the horizontal well distribution interval of two horizontal wells according to the estimated fracturing fracture parameters and the minimum horizontal main stress direction when the target block reservoir is transformed, so as to drill wells according to the horizontal well distribution interval and fracture the two drilled target horizontal wells by utilizing a preset fracturing scheme;
the coring well parameter acquisition module acquires a well track and coring parameters of the coring well according to the positions of the two target horizontal wells, the minimum horizontal main stress direction and the preset fracturing scheme, so as to perform well drilling and coring according to the well track and the coring parameters, and then measures the fracture parameters of the taken-out rock core to obtain the hydraulic fracture space spread condition of the target work area;
and the horizontal well distribution interval optimizing module optimizes the horizontal well distribution interval of the subsequent well drilling of the target work area according to the spatial distribution condition of the hydraulic cracks of the target work area.
Further, the stress parameter data further includes: a maximum horizontal principal stress direction;
this optimizing device of horizontal well cloth well interval based on coring analysis after horizontal well fracturing still includes:
The first estimated fracture parameter acquisition module acquires the estimated fracture parameter according to the pre-compression evaluation data and the maximum horizontal main stress direction.
Further, the method further comprises the following steps:
and the second estimated fracture parameter acquisition module acquires the estimated fracture parameters according to the historical fracture data of the target block.
Further, the method further comprises the following steps:
the logging data acquisition module acquires logging data of the target work area;
and the well logging data interpretation module is used for interpreting the stress parameter data according to the well logging data.
Further, the method further comprises the following steps:
and the pre-press evaluation data acquisition module acquires pre-press evaluation data of the target work area.
Further, the pre-press evaluation data includes: reservoir parameters, wellbore parameters, rock mechanical parameters, and fracturing fluid properties parameters.
Further, the fracture parameters include: average fracture length, average fracture width, and average fracture height.
In a third aspect, an electronic device is provided, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to perform the steps of the above-described method of optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well.
In a fourth aspect, a computer readable storage medium is provided having stored thereon a computer program which, when executed by a processor, performs the steps of the above-described method of optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well.
The invention provides a method and a device for optimizing horizontal well spacing based on core analysis after horizontal well fracturing, electronic equipment and a computer readable storage medium, wherein the method comprises the following steps: obtaining stress parameter data of a target work area, wherein the stress parameter data comprises a minimum horizontal main stress direction; obtaining the horizontal well spacing of two horizontal wells according to the estimated fracturing fracture parameters and the minimum horizontal main stress direction during the reservoir reconstruction of the target block, so as to drill wells according to the horizontal well spacing and fracture the two drilled target horizontal wells by utilizing a preset fracturing scheme; acquiring a well track and coring parameters of a coring well according to the positions of two target horizontal wells, the minimum horizontal main stress direction and the preset fracturing scheme, performing well drilling and coring according to the well track and the coring parameters, and measuring the crack parameters of the extracted cores to obtain the spatial spreading condition of hydraulic cracks of the target work area; and optimizing the horizontal well distribution distance of the subsequent well drilling of the target work area according to the spatial distribution condition of the hydraulic fracture of the target work area. The method is visual, the effect is obvious, the length and the width of the crack can be accurately described, the horizontal well distribution interval of the subsequent well drilling of the target work area can be optimized according to the spatial distribution condition of the hydraulic cracks of the target work area, the rationality of the well distribution of the work area can be improved, and the productivity of the work area is further improved.
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
fig. 1 is a schematic diagram of an architecture between a server S1 and a client device B1 according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an architecture among a server S1, a client device B1 and a database server S2 according to an embodiment of the present invention;
FIG. 3 is a flow diagram I of a method for optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well in an embodiment of the present invention;
FIG. 4 is a second flow chart of a method for optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well in an embodiment of the present invention;
FIG. 5 is a flow chart diagram III of a method for optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well in an embodiment of the present invention;
FIG. 6 illustrates the locations of two target horizontal wells and a cored well in an embodiment of the invention;
FIG. 7 is a block diagram of a horizontal well spacing optimization apparatus based on post-fracturing coring analysis of a horizontal well in an embodiment of the present invention;
fig. 8 is a block diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It will be appreciated by those skilled in the art that 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.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present application and in the foregoing figures, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The prior art has poor effect in accurately describing the length, the width and the like of the crack, directly influences the rationality of well arrangement, and further influences the productivity of a work area.
In order to at least partially solve the technical problems in the prior art, the embodiment of the invention provides an optimization method for the horizontal well distribution interval based on the coring analysis after the fracturing of the horizontal well, the spatial distribution condition of the hydraulic fracture of the target work area is obtained through the coring connection of the drilling wells in the middle of two target horizontal wells, the method is visual, the effect is obvious, the length and the width of the fracture can be accurately described, the horizontal well distribution interval of the subsequent drilling wells of the target work area is optimized according to the spatial distribution condition of the hydraulic fracture of the target work area, the rationality of the well distribution of the work area can be improved, and the productivity of the work area is further improved.
In view of this, the present application provides an optimization apparatus for horizontal well spacing based on post-fracturing coring analysis of a horizontal well, where the apparatus may be a server S1, see fig. 1, where the server S1 may be communicatively connected to at least one client device B1, where the client device B1 may send data such as stress parameter data of a target work area and estimated fracture parameters during target zone reservoir reconstruction to the server S1, and where the server S1 may receive the data online. The server S1 can pretreat the acquired data online or offline, acquire the horizontal well spacing of two horizontal wells according to the estimated fracturing fracture parameters during target zone reservoir reconstruction and the minimum horizontal main stress direction in the stress parameter data of the target work zone, so as to drill wells according to the horizontal well spacing and fracture the two drilled target horizontal wells by utilizing a preset fracturing scheme; acquiring a well track and coring parameters of a coring well according to the positions of two target horizontal wells, the minimum horizontal main stress direction and the preset fracturing scheme, performing well drilling coring according to the well track and the coring parameters, and measuring the crack parameters of the extracted cores to obtain the spatial distribution condition of hydraulic cracks of the target work area; and optimizing the horizontal well distribution distance of the subsequent well drilling of the target work area according to the space distribution condition of the hydraulic fracture of the target work area.
In addition, referring to fig. 2, the server S1 may be further communicatively connected to at least one database server S2, where the database server S2 is configured to store pre-pressure evaluation data or historical fracturing data of a target zone and logging data of a target work area. The database server S2 sends the pre-compression evaluation data or the historical fracturing data of the target block and the logging data of the target work area to the server S1 online, the server S1 can receive the data online, and then obtain the estimated fracturing fracture parameters according to the pre-compression evaluation data and the maximum horizontal main stress direction, or obtain the estimated fracturing fracture parameters according to the historical fracturing data of the target block, and obtain the stress parameter data according to the logging data.
Based on the above, the client device B1 may have a display interface. It is understood that the client device B1 may include a smart phone, a tablet electronic device, a portable computer, a desktop computer, a Personal Digital Assistant (PDA), etc.
In practical applications, part of the optimization method for performing the horizontal well spacing based on the post-fracturing coring analysis of the horizontal well may be performed on the server S1 side as described above, i.e., the architecture shown in fig. 1, or all operations may be performed in the client device B1, and the client device B1 may be directly connected in communication with the database server S2. Specifically, the selection may be performed according to the processing capability of the client device B1, and restrictions of the use scenario of the user. The present application is not limited in this regard. If all operations are done in the client device B1, the client device B1 may further include a processor for performing an optimized specific treatment of the horizontal well spacing based on the post-fracturing coring analysis of the horizontal well.
Any suitable network protocol may be used for communication between the server and the client device, including those not yet developed at the filing date of this application. The network protocols may include, for example, TCP/IP protocol, UDP/IP protocol, HTTP protocol, HTTPS protocol, etc. Of course, the network protocol may also include, for example, RPC protocol (Remote Procedure Call Protocol ), REST protocol (Representational State Transfer, representational state transfer protocol), etc. used above the above-described protocol.
FIG. 3 is a flow diagram of a method for optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well in an embodiment of the present invention. As shown in fig. 3, the optimization method of the horizontal well cloth well spacing based on the core analysis after the fracturing of the horizontal well specifically comprises the following steps:
step S100: stress parameter data of a target work area is obtained.
The stress parameter data comprises a minimum horizontal main stress direction, a maximum horizontal main stress direction and the like.
It should be noted that the maximum horizontal main stress direction is the extension direction of the crack, and the minimum horizontal main stress direction is the drilling direction.
In addition, the maximum and minimum horizontal main stress directions of the area can be determined by adopting an area ground stress measurement method, or stress parameter data of a target work area can be obtained by using methods such as well logging stress test and the like.
Step S200: and obtaining the horizontal well distribution distance of the two horizontal wells according to the estimated fracturing crack parameters and the minimum horizontal main stress direction during target block reservoir transformation.
And drilling wells according to the well spacing of the horizontal wells, and fracturing the two drilled target horizontal wells by using a preset fracturing scheme.
It should be noted that, the length of the two target horizontal wells and the well completion mode are identical, and the abscissa of the two designed target horizontal wells is the stress direction of the minimum horizontal well, and the abscissas of the two designed target horizontal wells are identical, and the abscissas of the two designed target horizontal wells are different, for example, the distance is 1.0 time or more of the predicted fracture length, and the distance between the two designed target horizontal wells along the direction of the maximum horizontal main stress is generally within the range of 200-1000 meters.
Specifically, the fracture parameters include: average fracture length, average fracture width, average fracture height, etc.
Step S300: and obtaining the well track and the coring parameters of the coring well according to the positions of the two target horizontal wells, the minimum horizontal main stress direction and a preset fracturing scheme.
And drilling and coring according to the well track and the coring parameters, and measuring the fracture parameters of the taken out core to obtain the spatial distribution condition of the hydraulic fracture of the target work area.
The well track mainly comprises the length of a horizontal well section, the azimuth of the horizontal well and the like, and the coring parameters comprise the coring position, the length, the azimuth and the like, and can be obtained after coring through a special coring barrel.
It is worth noting that the horizontal coring well is used for continuous coring for observing the spatial spreading condition of hydraulic fracture. The target horizontal wells and the coring wells extend horizontally, the three wells are positioned in a work area, the three wells are parallel to each other, and the coring wells are positioned in the middle of the two target wells.
Specifically, the direction of the well track of the coring well is consistent with that of the target well, the abscissa of the starting position of the horizontal well section of the coring well is the same as that of the starting position of the target horizontal well, the ordinate is the 1/2Lf position of the estimated fracture length, namely the coring well is parallel to the two target horizontal wells and is positioned at the middle position of the two target horizontal wells, then parallel drilling is carried out along the track direction of the target well, continuous coring is carried out when the vertical distance between the coring well and the predicted first fracture is 30-50m, the first coring ending position is 30-50m away from the first fracture, drilling is carried out along the parallel track sequentially according to the first coring setting for a second time, a third time and the like, and the position of the last fracture of the target well is completely cored.
And then, analyzing the extracted core, observing whether artificial cracks exist in the core at different positions, measuring parameters such as the width of the artificial cracks, and analyzing the core from the starting point to the tail end of the target horizontal well. And further analyzing the influence of the target well reservoir transformation design parameters on the cracks to obtain the spatial distribution condition of the hydraulic cracks of the target work area: if the artificial cracks are not detected on the core obtained at each position, the well spacing of the horizontal well and the matching of the fracturing scheme are unreasonable, and then the spacing can be shortened or the fracturing scheme can be modified when the horizontal well is designed in the working area. If the positions of the cracks of the artificial cracks are different through coring, the parameters at the positions of the cracks basically realize the contact of the cracks, the construction parameters are more proper, and then the horizontal well layout interval and the fracturing scheme can be matched for design and construction when the horizontal well is designed in the work area.
Step S400: and optimizing the horizontal well distribution distance of the subsequent well drilling of the target work area according to the space distribution condition of the hydraulic fracture of the target work area.
Specifically, through the analysis of the spatial distribution condition of the hydraulic fracture of the target work area, if all coring does not obtain an artificial fracture, the method indicates that when the fracturing is performed under the conditions of the preset fracturing scheme and the horizontal well spacing, the prediction of fracture parameters is unreasonable, and then the distance between horizontal wells is further shortened or the preset fracturing scheme is adjusted when the horizontal well design is performed in the work area, so that the subsequent horizontal well drilled in the work area can achieve a better fracturing effect.
In summary, according to the optimization method for the horizontal well distribution interval based on the coring analysis after fracturing of the horizontal well, provided by the embodiment of the invention, the spatial distribution condition of the hydraulic fracture of the target work area is obtained through drilling coring connection between two target horizontal wells, the method is visual, the effect is obvious, the length and the width of the fracture can be accurately described, the horizontal well distribution interval of the subsequent drilling of the target work area is optimized according to the spatial distribution condition of the hydraulic fracture of the target work area, the rationality of the well distribution of the work area can be improved, and the productivity of the work area is further improved.
In an alternative embodiment, referring to fig. 4, the method for optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well may further comprise:
step S150: and obtaining the estimated fracture parameters according to the pre-compression evaluation data and the maximum horizontal main stress direction.
Wherein the pre-compression evaluation data includes: reservoir parameters, wellbore parameters (e.g., well coordinates), rock mechanical parameters (e.g., ground stress, etc.), fracturing fluid properties parameters, etc.
It is worth to say that the fracture model software Frapproprpt can be utilized to obtain the estimated fracture parameters, and specifically, the estimated fracture parameters can be obtained by inputting pre-fracture evaluation data and the maximum horizontal main stress direction into the software.
In a further embodiment, the method for optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well may further comprise: and acquiring pre-press evaluation data of the target work area.
In another alternative embodiment, referring to fig. 5, the method for optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well may further comprise:
step S150': and obtaining estimated fracture parameters according to the historical fracturing data of the target block.
The estimated fracture parameters can be obtained by counting the existing historical fracturing data of the existing fracturing wells in the block.
In an alternative embodiment, the method for optimizing the horizontal well spacing based on the post-fracturing coring analysis of the horizontal well may further comprise: and a step of acquiring logging data of the target work area and a step of obtaining the stress parameter data according to the interpretation of the logging data.
The stress parameter data is obtained according to the well logging data by interpretation, which is a common technical means in the art and will not be described herein.
In an alternative embodiment, the preset fracturing scheme may be: and (3) carrying out equidistant clustering on each well, wherein the distance of one cluster is generally 60-80m, each cluster is a crack after fracturing, the horizontal coordinates of the distances of the clusters on the two target horizontal wells are the same from the starting point position of the horizontal well, namely the clusters of the two target wells are opposite in the longitudinal direction, the densities, the distances and the like of the cracks transformed by the two wells are identical (namely, the positions of the cracks to be fractured can be obtained), and then setting parameters such as construction liquid amount, sand ratio, sand amount, displacement and the like during fracturing, and the crack transformation and technological parameters of the opposite clusters under the corresponding same horizontal coordinates of the two target horizontal wells are identical.
In summary, the optimization method for the horizontal well spacing based on the coring analysis after fracturing of the horizontal well provided by the embodiment of the invention starts from an actual mineral experiment method, well drilling and coring parameters are designed through careful design, the fracture expansion length and the geometric form are known between two horizontal wells through directional well drilling coring evaluation, so as to evaluate the reservoir fracturing transformation effect, guide the transformation optimization design of the whole block, basin and similar reservoirs, and from the aspects of field test condition and effect analysis, the method is reasonable in concept, visual in concept and remarkable in effect, successfully solves the problem of knowing the length of the previous fracture, and improves the transformation success rate and the fracturing transformation effect of reservoir fracturing.
For better understanding of the present invention, taking two target horizontal wells a and B and one core horizontal well C of a block as an example, referring to fig. 6, the horizontal maximum stress azimuth of the block is obtained by logging method and other data, and the horizontal minimum stress azimuth is in the north-south direction.
The frachprop fracturing simulation software and the fracturing simulation results of the former wells in the area are utilized to indicate that the length of an artificial crack formed by fracturing is estimated to be 100-150m, so that the distance between horizontal well sections of an A well and a B well is designed to be 150m, the lengths of the horizontal well sections of the two horizontal wells are designed to be 1000m, the horizontal coordinates of the starting points of the A well and the B well are the same, the two target horizontal wells are drilled after the design is completed, the two wells adopt a completely consistent design scheme, and only the vertical coordinates of the horizontal well sections differ by 150m, namely W=150 m, and the A well is positioned at the north part of the B well. The two horizontal wells are designed to be subjected to staged fracturing, the horizontal sections are uniformly staged modified, the positions of each crack of each horizontal well are 100m,200m,300m,400m,500m,600m,700m,800m,900m and 1000m positions, namely F1-F6 and F1 'to F6', so that the modified distance of each section is 100m, position parameters are provided for the coring position of the later-stage coring well, and the size, the liquid type, the propping agent and the like of each section of modification are the same. And then fracturing the two horizontal wells to achieve corresponding artificial cracks.
And (3) drilling a coring well C at the middle position of the two horizontal wells, wherein the abscissa of the starting point of the coring well is the same as the abscissa of the A well and the B well, and the ordinate is the coordinate of the middle position of the two comparison wells. The trajectory of the C well is parallel to the a well and the B well. The coring is continued at a distance of 30m from the lateral coordinate of the first fracture until 30m from the lateral coordinate of the first fracture F1 ends, after which the coring of F2-F6 takes place with the same starting position. And observing the taken out core, determining whether artificial cracks exist, measuring parameters such as the number and the width of the cracks, and further analyzing the influence of construction parameters and the like on the cracks by measuring and calculating different positions of a plurality of cracks.
Based on the same inventive concept, the embodiment of the application also provides an optimization device for the well spacing of the horizontal well based on the core analysis after fracturing of the horizontal well, which can be used for realizing the method described in the embodiment, and the embodiment is described below. Because the principle of solving the problem of the horizontal well spacing optimization device based on the horizontal well post-fracturing coring analysis is similar to that of the method, the implementation of the horizontal well spacing optimization device based on the horizontal well post-fracturing coring analysis can be seen from the implementation of the method, and the repetition is omitted. As used below, the term "unit" or "module" may be a combination of software and/or hardware that implements the intended function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
FIG. 7 is a block diagram of a horizontal well spacing optimization apparatus based on post-fracturing coring analysis of a horizontal well in accordance with an embodiment of the present invention. As shown in fig. 7, the optimization device for the horizontal well cloth well spacing based on the coring analysis after fracturing of the horizontal well specifically comprises: the system comprises a stress parameter data acquisition module 10, a horizontal well spacing acquisition module 20, a coring well parameter acquisition module 30 and a horizontal well spacing optimization module 40.
The stress parameter data acquisition module 10 acquires stress parameter data of a target work area, wherein the stress parameter data comprises a minimum horizontal main stress direction;
the stress parameter data comprises a minimum horizontal main stress direction, a maximum horizontal main stress direction and the like.
It should be noted that the maximum horizontal main stress direction is the extension direction of the crack, and the minimum horizontal main stress direction is the drilling direction.
In addition, the maximum and minimum horizontal main stress directions of the area can be determined by adopting an area ground stress measurement method, or stress parameter data of a target work area can be obtained by using methods such as well logging stress test and the like.
The horizontal well spacing obtaining module 20 obtains the horizontal well spacing of two horizontal wells according to the estimated fracturing fracture parameters and the minimum horizontal main stress direction when the target block reservoir is transformed, so as to drill wells according to the horizontal well spacing and fracture the two drilled target horizontal wells by using a preset fracturing scheme;
And drilling wells according to the well spacing of the horizontal wells, and fracturing the two drilled target horizontal wells by using a preset fracturing scheme.
It should be noted that, the length of the two target horizontal wells and the well completion mode are identical, and the abscissa of the two designed target horizontal wells is the stress direction of the minimum horizontal well, and the abscissas of the two designed target horizontal wells are identical, and the abscissas of the two designed target horizontal wells are different, for example, the distance is 1.0 time or more of the predicted fracture length, and the distance between the two designed target horizontal wells along the direction of the maximum horizontal main stress is generally within the range of 200-1000 meters.
Specifically, the fracture parameters include: average fracture length, average fracture width, average fracture height, etc.
The coring well parameter obtaining module 30 obtains the well track and the coring parameters of the coring well according to the positions of the two target horizontal wells, the minimum horizontal main stress direction and the preset fracturing scheme, so as to perform well drilling coring according to the well track and the coring parameters, and then measures the fracture parameters of the taken-out core to obtain the spatial distribution condition of the hydraulic fracture of the target work area;
and drilling and coring according to the well track and the coring parameters, and measuring the fracture parameters of the taken out core to obtain the spatial distribution condition of the hydraulic fracture of the target work area.
It is worth noting that the horizontal coring well is used for continuous coring for observing the spatial spreading condition of hydraulic fracture. The target horizontal wells and the coring wells extend horizontally, the three wells are positioned in a work area, the three wells are parallel to each other, and the coring wells are positioned in the middle of the two target wells.
Specifically, the direction of the well track of the coring well is consistent with that of the target well, the abscissa of the starting position of the horizontal well section of the coring well is the same as that of the starting position of the target horizontal well, the ordinate is the 1/2Lf position of the estimated fracture length, namely the coring well is parallel to the two target horizontal wells and is positioned at the middle position of the two target horizontal wells, then parallel drilling is carried out along the track direction of the target well, continuous coring is carried out when the vertical distance between the coring well and the predicted first fracture is 30-50m, the first coring ending position is 30-50m away from the first fracture, drilling is carried out along the parallel track sequentially according to the first coring setting for a second time, a third time and the like, and the position of the last fracture of the target well is completely cored.
And then, analyzing the extracted core, observing whether artificial cracks exist in the core at different positions, measuring parameters such as the width of the artificial cracks, and analyzing the core from the starting point to the tail end of the target horizontal well. And further analyzing the influence of the target well reservoir transformation design parameters on the cracks to obtain the spatial distribution condition of the hydraulic cracks of the target work area: if the artificial cracks are not detected on the core obtained at each position, the well spacing of the horizontal well and the matching of the fracturing scheme are unreasonable, and then the spacing can be shortened or the fracturing scheme can be modified when the horizontal well is designed in the working area. If the positions of the cracks of the artificial cracks are different through coring, the parameters at the positions of the cracks basically realize the contact of the cracks, the construction parameters are more proper, and then the horizontal well layout interval and the fracturing scheme can be matched for design and construction when the horizontal well is designed in the work area.
The horizontal well spacing optimization module 40 optimizes the horizontal well spacing of the subsequent well drilling of the target work area according to the spatial distribution condition of the hydraulic fracture of the target work area.
Specifically, through the analysis of the spatial distribution condition of the hydraulic fracture of the target work area, if all coring does not obtain an artificial fracture, the method indicates that when the fracturing is performed under the conditions of the preset fracturing scheme and the horizontal well spacing, the prediction of fracture parameters is unreasonable, and then the distance between horizontal wells is further shortened or the preset fracturing scheme is adjusted when the horizontal well design is performed in the work area, so that the subsequent horizontal well drilled in the work area can achieve a better fracturing effect.
In summary, according to the optimization device for the horizontal well distribution interval based on the coring analysis after fracturing of the horizontal well, provided by the embodiment of the invention, the spatial distribution condition of the hydraulic fracture of the target work area is obtained through drilling coring connection between two target horizontal wells, the method is visual, the effect is obvious, the length and the width of the fracture can be accurately described, the horizontal well distribution interval of the subsequent drilling of the target work area is optimized according to the spatial distribution condition of the hydraulic fracture of the target work area, the rationality of the well distribution of the work area can be improved, and the productivity of the work area is further improved.
In an alternative embodiment, the optimization device for horizontal well cloth well spacing based on the post-fracturing coring analysis of the horizontal well may further comprise: and the first estimated fracture parameter acquisition module acquires the estimated fracture parameters according to the pre-compression evaluation data and the maximum horizontal main stress direction.
Wherein the pre-compression evaluation data includes: reservoir parameters, wellbore parameters (e.g., well coordinates), rock mechanical parameters (e.g., ground stress, etc.), fracturing fluid properties parameters, etc.
It is worth to say that the fracture model software Frapproprpt can be utilized to obtain the estimated fracture parameters, and specifically, the estimated fracture parameters can be obtained by inputting pre-fracture evaluation data and the maximum horizontal main stress direction into the software.
In a further embodiment, the optimization device for horizontal well cloth well spacing based on the post-fracturing coring analysis of the horizontal well may further comprise: and the pre-press evaluation data acquisition module acquires the pre-press evaluation data of the target work area.
In another alternative embodiment, the optimization device for horizontal well cloth well spacing based on the post-fracturing coring analysis of the horizontal well may further comprise: and the second estimated fracture parameter acquisition module acquires the estimated fracture parameters according to the historical fracturing data of the target block.
The estimated fracture parameters can be obtained by counting the existing historical fracturing data of the existing fracturing wells in the block.
In an alternative embodiment, the optimization device for horizontal well cloth well spacing based on the post-fracturing coring analysis of the horizontal well may further comprise: the system comprises a logging data acquisition module and a logging data interpretation module.
The logging data acquisition module acquires logging data of the target work area;
and the well logging data interpretation module is used for interpreting the stress parameter data according to the well logging data.
The stress parameter data is obtained according to the well logging data by interpretation, which is a common technical means in the art and will not be described herein.
In an alternative embodiment, the preset fracturing scheme may be: and (3) carrying out equidistant clustering on each well, wherein the distance of one cluster is generally 60-80m, each cluster is a crack after fracturing, the horizontal coordinates of the distances of the clusters on the two target horizontal wells are the same from the starting point position of the horizontal well, namely the clusters of the two target wells are opposite in the longitudinal direction, the densities, the distances and the like of the cracks transformed by the two wells are identical (namely, the positions of the cracks to be fractured can be obtained), and then setting parameters such as construction liquid amount, sand ratio, sand amount, displacement and the like during fracturing, and the crack transformation and technological parameters of the opposite clusters under the corresponding same horizontal coordinates of the two target horizontal wells are identical.
In summary, the optimization device for the horizontal well spacing based on the coring analysis after fracturing of the horizontal well provided by the embodiment of the invention starts from an actual mineral experiment method, through careful design, through data processing and design of drilling and coring parameters, the fracture expansion length and the geometric form are known between two horizontal wells through directional drilling coring evaluation so as to evaluate the fracturing transformation effect of the reservoir, guide the transformation optimization design of the whole block, basin and similar reservoir, and from the aspects of field test condition and effect analysis, the method has reasonable concept, visual method and remarkable effect, successfully solves the problem of knowing the length of the previous fracture, and improves the transformation success rate and the fracturing transformation effect of the reservoir fracturing.
The apparatus, module or unit set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. A typical implementation device is an electronic device, which may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
In a typical example the electronic device comprises in particular a memory, a processor and a computer program stored on the memory and executable on the processor, said processor implementing the following steps when said program is executed:
obtaining stress parameter data of a target work area, wherein the stress parameter data comprises a minimum horizontal main stress direction;
obtaining the horizontal well spacing of two horizontal wells according to the estimated fracturing fracture parameters and the minimum horizontal main stress direction during the reservoir reconstruction of the target block, so as to drill wells according to the horizontal well spacing and fracture the two drilled target horizontal wells by utilizing a preset fracturing scheme;
acquiring a well track and coring parameters of a coring well according to the positions of two target horizontal wells, the minimum horizontal main stress direction and the preset fracturing scheme, performing well drilling and coring according to the well track and the coring parameters, and measuring the crack parameters of the extracted cores to obtain the spatial spreading condition of hydraulic cracks of the target work area;
and optimizing the horizontal well distribution distance of the subsequent well drilling of the target work area according to the spatial distribution condition of the hydraulic fracture of the target work area.
From the above description, it can be seen that, by the electronic device provided by the embodiment of the invention, the spatial distribution condition of the hydraulic fracture of the target work area is obtained by drilling coring connection between two target horizontal wells, the method is visual, the effect is obvious, the length and the width of the fracture can be accurately described, the horizontal well distribution interval of the subsequent drilling of the target work area can be optimized according to the spatial distribution condition of the hydraulic fracture of the target work area, the rationality of the well distribution of the work area can be improved, and the productivity of the work area is further improved.
Referring now to fig. 8, a schematic diagram of an electronic device 600 suitable for use in implementing embodiments of the present application is shown.
As shown in fig. 8, the electronic apparatus 600 includes a Central Processing Unit (CPU) 601, which can perform various appropriate works and processes according to a program stored in a Read Only Memory (ROM) 602 or a program loaded from a storage section 608 into a Random Access Memory (RAM)) 603. In the RAM603, various programs and data required for the operation of the system 600 are also stored. The CPU601, ROM602, and RAM603 are connected to each other through a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.
The following components are connected to the I/O interface 605: an input portion 606 including a keyboard, mouse, etc.; an output portion 607 including a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, a speaker, and the like; a storage section 608 including a hard disk and the like; and a communication section 609 including a network interface card such as a LAN card, a modem, or the like. The communication section 609 performs communication processing via a network such as the internet. The drive 610 is also connected to the I/O interface 605 as needed. Removable media 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on drive 610 as needed, so that a computer program read therefrom is mounted as needed as storage section 608.
In particular, according to embodiments of the present invention, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, an embodiment of the invention includes a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
obtaining stress parameter data of a target work area, wherein the stress parameter data comprises a minimum horizontal main stress direction;
obtaining the horizontal well spacing of two horizontal wells according to the estimated fracturing fracture parameters and the minimum horizontal main stress direction during the reservoir reconstruction of the target block, so as to drill wells according to the horizontal well spacing and fracture the two drilled target horizontal wells by utilizing a preset fracturing scheme;
acquiring a well track and coring parameters of a coring well according to the positions of two target horizontal wells, the minimum horizontal main stress direction and the preset fracturing scheme, performing well drilling and coring according to the well track and the coring parameters, and measuring the crack parameters of the extracted cores to obtain the spatial spreading condition of hydraulic cracks of the target work area;
and optimizing the horizontal well distribution distance of the subsequent well drilling of the target work area according to the spatial distribution condition of the hydraulic fracture of the target work area.
As can be seen from the above description, the computer readable storage medium provided by the embodiment of the present invention obtains the spatial distribution situation of the hydraulic fracture of the target work area by drilling and coring connection between two target horizontal wells, and the method is visual and has obvious effect, the length and the width of the fracture can be accurately described, the horizontal well distribution interval of the subsequent drilling of the target work area can be optimized according to the spatial distribution situation of the hydraulic fracture of the target work area, the rationality of the well distribution of the work area can be improved, and the productivity of the work area is further improved.
In such an embodiment, the computer program may be downloaded and installed from a network through the communication portion 609, and/or installed from the removable medium 611.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
For convenience of description, the above devices are described as being functionally divided into various units, respectively. Of course, the functions of each element may be implemented in one or more software and/or hardware elements when implemented in the present application.
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.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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 application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (16)
1. The method for optimizing the horizontal well spacing based on the post-fracturing coring analysis of the horizontal well is characterized by comprising the following steps:
stress parameter data of a target work area is obtained, wherein the stress parameter data comprise the minimum horizontal main stress direction;
obtaining the horizontal well spacing of two horizontal wells according to the estimated fracturing fracture parameters and the minimum horizontal main stress direction when the target work area reservoir is reformed, so as to drill wells according to the horizontal well spacing and fracture the two drilled target horizontal wells by utilizing a preset fracturing scheme;
acquiring a well track and coring parameters of a coring well according to the positions of two target horizontal wells, the minimum horizontal main stress direction and the preset fracturing scheme, performing well drilling coring according to the well track and the coring parameters, and measuring the crack parameters of the extracted cores to obtain the spatial distribution condition of hydraulic cracks of the target work area;
and optimizing the horizontal well distribution distance of the subsequent well drilling of the target work area according to the space distribution condition of the hydraulic fracture of the target work area.
2. The method for optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well of claim 1, wherein said stress parameter data further comprises: a maximum horizontal principal stress direction;
The optimization method of the horizontal well spacing based on the horizontal well post-fracturing coring analysis further comprises the following steps:
and acquiring the estimated fracture parameters according to the pre-compression evaluation data and the maximum horizontal main stress direction.
3. The method for optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well of claim 1, further comprising:
and acquiring the estimated fracture parameters according to the historical fracturing data of the target work area.
4. The method for optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well of claim 1, further comprising:
acquiring logging data of the target work area;
and interpreting according to the logging data to obtain the stress parameter data.
5. The method for optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well of claim 1, further comprising:
and acquiring pre-press evaluation data of the target work area.
6. The method for optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well of claim 5, wherein said pre-fracturing evaluation data comprises: reservoir parameters, wellbore parameters, rock mechanical parameters, and fracturing fluid properties parameters.
7. The method for optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well of claim 1, wherein the fracturing fracture parameters comprise: average fracture length, average fracture width, and average fracture height.
8. Horizontal well cloth well interval optimizing device based on core analysis after horizontal well fracturing, characterized by comprising:
the stress parameter data acquisition module is used for acquiring stress parameter data of a target work area, wherein the stress parameter data comprise a minimum horizontal main stress direction;
the horizontal well distribution interval acquisition module acquires the horizontal well distribution interval of two horizontal wells according to the estimated fracturing crack parameters and the minimum horizontal main stress direction when the target work area reservoir is transformed, so as to drill wells according to the horizontal well distribution interval and fracture the two drilled target horizontal wells by utilizing a preset fracturing scheme;
the coring well parameter acquisition module acquires a well track and coring parameters of the coring well according to the positions of the two target horizontal wells, the minimum horizontal main stress direction and the preset fracturing scheme, so as to perform well drilling coring according to the well track and the coring parameters, and then measures the fracture parameters of the taken-out core to obtain the spatial spreading condition of the hydraulic fracture of the target work area;
And the horizontal well distribution interval optimizing module optimizes the horizontal well distribution interval of the subsequent well drilling of the target work area according to the spatial distribution condition of the hydraulic cracks of the target work area.
9. The horizontal well spacing optimization apparatus based on horizontal well post-fracturing coring analysis of claim 8, wherein said stress parameter data further comprises: a maximum horizontal principal stress direction;
the optimizing device of the horizontal well cloth well spacing based on the horizontal well post-fracturing coring analysis further comprises:
and the first estimated fracture parameter acquisition module acquires the estimated fracture parameters according to the pre-compression evaluation data and the maximum horizontal main stress direction.
10. The horizontal well spacing optimization device based on post-fracturing coring analysis of a horizontal well of claim 8, further comprising:
and the second estimated fracture parameter acquisition module acquires the estimated fracture parameters according to the historical fracturing data of the target work area.
11. The horizontal well spacing optimization device based on post-fracturing coring analysis of a horizontal well of claim 8, further comprising:
the logging data acquisition module acquires logging data of the target work area;
And the logging data interpretation module is used for interpreting the stress parameter data according to the logging data.
12. The horizontal well spacing optimization device based on post-fracturing coring analysis of a horizontal well of claim 8, further comprising:
and the pre-press evaluation data acquisition module acquires the pre-press evaluation data of the target work area.
13. The horizontal well spacing optimization apparatus based on a horizontal well post-fracturing coring analysis of claim 12, wherein said pre-press evaluation data comprises: reservoir parameters, wellbore parameters, rock mechanical parameters, and fracturing fluid properties parameters.
14. The horizontal well spacing optimization device based on a post-fracturing coring analysis of a horizontal well of claim 8, wherein the fracturing fracture parameters comprise: average fracture length, average fracture width, and average fracture height.
15. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor performs the steps of the method for optimizing horizontal well spacing based on post-fracturing coring analysis of a horizontal well as set forth in any one of claims 1 to 7.
16. A computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the method for optimizing horizontal well spacing based on post-horizontal well fracturing coring analysis of any one of claims 1 to 7.
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