CN112052631B - Method and device for determining initial unobstructed flow parameters of target well section of new drilled well - Google Patents
Method and device for determining initial unobstructed flow parameters of target well section of new drilled well Download PDFInfo
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Abstract
The invention provides a method and a device for determining an initial unobstructed flow parameter of a target well section of a finished new well, wherein the method comprises the following steps: acquiring a well testing curve and a well logging interpretation result of a new well target well section drilled in a work area, wherein the well logging interpretation result comprises a crack line density parameter; determining the reservoir type of the target well section of the completed new well according to the well testing curve of the target well section of the completed new well in the work area; and inputting the density parameter of the crack line into a pre-established model of relationship between the density parameter of the crack line and the unobstructed flow parameter corresponding to the reservoir type in the work area to obtain an initial unobstructed flow parameter of a target well section of a new well drilled in the work area, wherein the corresponding unobstructed flow parameter is obtained by inputting the density parameter of the crack line of the target well section of the new well drilled in the work area into the pre-established model of the reservoir type corresponding to the target well section in the work area to accurately determine the initial unobstructed flow parameter of the gas well under the condition of non-well completion test.
Description
Technical Field
The invention relates to the technical field of oil and gas reservoir development, in particular to a method and a device for determining an initial unobstructed flow parameter of a target well section of a fractured compact sandstone gas reservoir after drilling a new well.
Background
At present, about hundreds of fractured sandstone gas reservoirs are around the world, and most of other fractured gas reservoirs are limestone, dolomite or siltstone. The fracture plays an important role in a low-permeability compact reservoir, is not only a fluid storage space, but also an important seepage channel of the fluid, and plays roles in communicating matrix pores and increasing swept area. According to incomplete statistics, fractured reservoirs are distributed from Taigu to the new world and are mostly low-porosity and low-permeability reservoir sandstone, carbonate and volcanic rock reservoirs. Domestic fractured reservoirs are distributed more commonly in Tarim basins and Sichuan basins, and are also distributed abroad in the middle of America and in the gulf of Mexico.
In the development process of the ultra-deep complex fractured gas reservoir, the initial unobstructed flow parameter of the drilled new well has a certain guiding function on the capacity scale design of the fractured compact sandstone gas reservoir and the reasonable production allocation of the gas well. Because the development degrees and the grades of the cracks at different structure positions are different, the degrees of the cracks cutting the compact matrix are different, so that the development degrees of reservoirs at different structure positions are greatly different, and the initial unobstructed flow parameter difference of the new well at different positions is larger.
The reservoir medium of the fractured tight sandstone gas reservoir is obviously different from the 'dual medium' of the conventional fractured pores, and the method for determining the initial unobstructed flow parameter of the conventional dual medium reservoir in the process of completing the new well has relatively poor applicability to the fractured tight sandstone gas reservoir.
The existing method for determining the initial unobstructed flow parameters of the target well section of the new fractured tight sandstone gas reservoir after drilling generally depends on well completion test data, but the fractured tight sandstone gas reservoir generally has abnormal high pressure, so that great risk exists in well completion test construction, the well completion test data is difficult to obtain, and the difficulty and the low precision in determining the initial unobstructed flow parameters of the target well section of the new fractured tight sandstone gas reservoir after drilling are caused.
Disclosure of Invention
In view of the above, the invention provides a method and a device for determining an initial unobstructed flow parameter of a target well section of a fractured tight sandstone gas reservoir drilled new well, an electronic device and a computer-readable storage medium, which can accurately determine the initial unobstructed flow parameter of a gas well under the condition of non-completion test for a new drilled well in a developed work area, and solve the problems of high difficulty and low precision in determining the initial unobstructed flow parameter of the new drilled fractured tight sandstone gas reservoir.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, a method for determining an initial unobstructed flow parameter of a target well section of a fractured tight sandstone gas reservoir after drilling a new well is provided, which comprises the following steps:
acquiring a well testing curve and a well logging interpretation result of a new well target well section drilled in a work area, wherein the well logging interpretation result comprises a crack line density parameter;
determining the reservoir type of the target well section of the finished new well according to the well testing curve of the target well section of the finished new well in the work area;
and inputting the crack line density parameter into a pre-established crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type in the work area to obtain an initial unobstructed flow parameter of a new well target section drilled in the work area.
Further, still include:
and establishing a relation model of density parameters and unobstructed flow parameters of the crack lines in the work area.
Further, the establishing of the relation model of density parameter of the crack line in the work area and the unobstructed flow parameter comprises:
acquiring logging interpretation results and well completion interpretation data of target well sections of a plurality of production wells in a work area where the completely drilled new well is located, wherein the reservoir type of the target well section of the production well is the same as that of the target well section of the completely drilled new well, the logging interpretation results comprise crack line density parameters, and the well completion test interpretation data comprise unobstructed flow parameters;
and carrying out regression analysis on the crack line density parameters and the unobstructed flow parameters of the target well sections of the multiple production wells in the work area to obtain a crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type.
Further, the establishing of the relation model between the density parameter of the crack line in the work area and the unobstructed flow parameter further includes:
acquiring well test curves of target well sections of all production wells in a work area where the completed new well is drilled;
and determining the reservoir type of the target well section of the production well according to the well testing curve of the target well section of the production well.
Further, the reservoir types include fracture development type and fracture development type.
In a second aspect, a device for determining an initial unobstructed flow parameter of a target well section of a fractured tight sandstone gas reservoir after drilling a new well is provided, which includes:
the new well drilling completion data acquisition module is used for acquiring a well testing curve and a well logging interpretation result of a new well drilling completion target well section in a work area, wherein the well logging interpretation result comprises a crack line density parameter;
the reservoir type determination module of the finished new well determines the reservoir type of the target well section of the finished new well according to the well testing curve of the target well section of the finished new well in the work area;
and the unobstructed flow parameter determining module is used for inputting the crack line density parameter into a pre-established crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type in the work area to obtain an initial unobstructed flow parameter of a target well section of a new well drilled in the work area.
Further, still include:
and the modeling module is used for establishing a relation model of density parameters and unobstructed flow parameters of the crack lines in the work area.
Further, the modeling module includes:
the production well data acquisition unit is used for acquiring logging interpretation results and well completion interpretation data of target well sections of a plurality of production wells in a work area where the completely drilled new well is located, wherein the reservoir type of the target well section of the production well is the same as that of the target well section of the completely drilled new well, the logging interpretation results comprise crack line density parameters, and the well completion test interpretation data comprise non-resistance flow parameters;
and the regression analysis unit is used for carrying out regression analysis on the crack line density parameters and the unobstructed flow parameters of the target well sections of the multiple production wells in the work area to obtain a crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type.
Further, the modeling module further comprises:
the production well test curve acquisition unit is used for acquiring test curves of target well sections of all production wells in a work area where the completed new well is located;
and the production well reservoir type determining unit is used for determining the reservoir type of the target well section of the production well according to the well testing curve of the target well section of the production well.
Further, the reservoir types include fracture development type and fracture development type.
In a third aspect, an electronic device is provided, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the program, the processor implements the steps of the method for determining the initial unobstructed flow parameter of the target interval for completing drilling of the new well in the fractured tight sandstone gas reservoir.
In a fourth aspect, a computer readable storage medium is provided, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the method for determining the initial unobstructed flow parameter when a fractured tight sandstone gas reservoir finishes drilling a new well section of interest.
The invention provides a method and a device for determining an initial unobstructed flow parameter of a target well section of a fractured tight sandstone gas reservoir after drilling of a new well, electronic equipment and a computer-readable storage medium, wherein the method comprises the following steps: acquiring a well testing curve and a well logging interpretation result of a new well target well section drilled in a work area, wherein the well logging interpretation result comprises a crack line density parameter; determining the reservoir type of the target well section of the completed new well according to the well testing curve of the target well section of the completed new well in the work area; the crack line density parameter is input into a crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type in a pre-established working area, and initial unobstructed flow parameter of a new well section of a drilled new well in the working area is obtained, wherein the crack line density parameter of the target well section of the drilled new well is input into the pre-established model corresponding to the reservoir type of the target well section in the working area, so that the corresponding unobstructed flow parameter is obtained, the initial unobstructed flow parameter of the gas well can be accurately determined under the condition of non-well completion test, the problems of high difficulty and low precision in determining the initial unobstructed flow parameter of the drilled new well of the fractured compact sandstone gas reservoir are solved, guidance for the initial production allocation scale of the new well of the gas reservoir type can be facilitated, and construction risks caused by well completion test can be avoided.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following descriptions are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts. In the drawings:
fig. 1 is a schematic structural diagram 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 first schematic flow chart of a method for determining an initial unobstructed flow parameter of a target well section of a fractured tight sandstone gas reservoir after drilling a new well in an embodiment of the invention;
FIG. 4 illustrates a well test profile of a completed new well target interval;
FIG. 5a shows a pressure derivative curve with a posterior segment having a straight segment with a pronounced slope of 1/2 and no pronounced radial flow feature;
FIG. 5b shows a pressure derivative curve with no straight line segment with a pronounced slope of 1/2 and with pronounced radial flow characteristics at the latter stage;
FIG. 6 is a schematic flow chart of a method for determining an initial unobstructed flow parameter of a target interval for drilling a new well in a fractured tight sandstone gas reservoir in an embodiment of the invention;
FIG. 7 shows a specific step of step S10 in FIG. 6;
FIG. 8 shows a schematic diagram of regression analysis of crack line density parameters;
fig. 9 shows another specific step of step S10 in fig. 6;
fig. 10 is a structural block diagram of the initial unobstructed flow parameter determination device for the target well section of the fractured tight sandstone gas reservoir after drilling of the new well in the embodiment of the invention;
fig. 11 is a block diagram of an electronic device according to an embodiment of the invention.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
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.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the above-described drawings, 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, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The existing method for determining the initial unobstructed flow parameters of the target well section of the new drilled well of the fractured tight sandstone gas reservoir generally depends on well completion test data, but the fractured tight sandstone gas reservoir generally has abnormal high pressure, so that the well completion test construction has a large risk, the well completion test data is difficult to obtain, and the initial unobstructed flow parameters of the target well section of the new drilled well of the fractured tight sandstone gas reservoir are difficult to determine and have low precision.
In order to solve the technical problems in the prior art, embodiments of the present invention provide a method and an apparatus for determining an initial unobstructed flow parameter of a target well section of a fractured tight sandstone gas reservoir after drilling a new well, wherein a fracture line density parameter of the target well section after drilling the new well is input into a pre-established model of a reservoir type corresponding to the target well section in a work area to obtain a corresponding unobstructed flow parameter, so that the initial unobstructed flow parameter of the gas well can be accurately determined under the condition of no well completion test, the problems of high difficulty and low precision in determining the initial unobstructed flow parameter of the fractured tight sandstone gas reservoir after drilling the new well are solved, guidance for the initial production allocation scale of the new well of the fractured tight sandstone gas reservoir is facilitated, and construction risks caused by the well completion test can be avoided.
In view of this, the present application provides a fracture line density parameter-unobstructed flow parameter relation model-based device for determining an initial unobstructed flow parameter of a fractured tight sandstone gas reservoir target well section after completing drilling of a new well, the device may be a server S1, see fig. 1, the server S1 may be in communication connection with at least one client device B1, the client device B1 may send a well test curve and a well logging interpretation result of the target well section after completing drilling of the new well to the server S1, and the server S1 may receive the well test curve and the well logging interpretation result of the target well section after completing drilling of the new well on line. The server S1 can carry out on-line or off-line preprocessing on the acquired well testing curve and the well logging interpretation result of the target well section of the completed new well, and determines the reservoir type of the target well section of the completed new well according to the well testing curve of the target well section of the completed new well; and inputting the crack line density parameter into a pre-established crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type in the work area to obtain an initial unobstructed flow parameter of the target well section of the drilled new well. Then, the server S1 may send the initial unobstructed flow parameter of the target well section of the completed new well to the client device B1 on line. The client device B1 may receive the initial unobstructed flow parameter of the target wellbore section of the completed new wellbore online.
In addition, referring to fig. 2, the server S1 may further be communicatively connected to at least one database server S2, and the database server S2 is configured to store well logging interpretation results and well completion interpretation data of target intervals of a plurality of production wells in a work area in which the completed new well is located. The database server S2 sends the well logging interpretation results and the well completion interpretation data of the target well sections of the multiple production wells of the work area where the completely drilled new well is located to the server S1 on line, the server S1 can receive the well logging interpretation results and the well completion interpretation data of the target well sections of the multiple production wells of the work area where the completely drilled new well is located on line, and then a crack line density parameter-unobstructed flow parameter relation model in the work area is established according to the well logging interpretation results and the well completion interpretation data of the target well sections of the multiple production wells of the work area where the completely drilled new well is located.
Based on the above, the client device B1 may have a display interface, so that the user can view the initial unobstructed flow parameter of the target well section of the completed new well sent by the server S1 according to the interface.
It is understood that the client device B1 may include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a Personal Digital Assistant (PDA), an in-vehicle device, a smart wearable device, and the like. Wherein, intelligence wearing equipment can include intelligent glasses, intelligent wrist-watch, intelligent bracelet etc..
In practical applications, the determination of the initial unobstructed flow parameter of the fractured tight sandstone gas reservoir after drilling the new well target interval may be performed on the server S1 side as described above, that is, as shown in fig. 1, or all operations may be completed in the client device B1, and the client device B1 may be directly in communication connection with the database server S2. Specifically, the selection may be performed according to the processing capability of the client device B1, the limitation of the user usage scenario, and the like. This is not a limitation of the present application. If all the operations are completed in the client device B1, the client device B1 may further include a processor, which is configured to perform specific processing for determining an initial unobstructed flow parameter when the fractured tight sandstone gas reservoir finishes drilling a new well target interval.
The server and the client device may communicate using any suitable network protocol, including network protocols not yet developed at the filing date of this application. The network protocol may include, for example, a TCP/IP protocol, a UDP/IP protocol, an HTTP protocol, an HTTPS protocol, or the like. Of course, the network Protocol may also include, for example, an RPC Protocol (Remote Procedure Call Protocol), a REST Protocol (Representational State Transfer Protocol), and the like used above the above Protocol.
Fig. 3 is a first flow chart of the method for determining the initial unobstructed flow parameter of the target well section of the fractured tight sandstone gas reservoir after the new well is drilled in the embodiment of the invention. As shown in fig. 3, the method for determining the initial unobstructed flow parameter of the target interval of the fractured tight sandstone gas reservoir after the new well is drilled may include the following steps:
step S100: and acquiring a well testing curve and a well logging interpretation result of a new well target well section drilled in the work area, wherein the well logging interpretation result comprises a crack line density parameter.
Wherein, the well test curve and the well logging interpretation result are known, and the well logging interpretation result comprises various parameters, such as: porosity, number of cracks, crack porosity, crack permeability, etc., of which crack line density parameter is one.
Step S200: and determining the reservoir type of the target well section of the completed new well according to the well testing curve of the target well section of the completed new well in the work area.
The reservoir types can be distinguished according to well testing curves, and can be divided into fracture development reservoirs and fracture development reservoirs.
Specifically, when the rear section of the pressure derivative curve of the well test curve (see fig. 4) has a straight line section with a distinct slope of 1/2 and no distinct radial flow characteristic, the reservoir type of the target well section is a fractured developmental reservoir (see fig. 5 a), and the radial flow characteristic section is a straight line section of the pressure derivative curve of the well test curve with a slope of 0; otherwise, the reservoir type of the target interval is a fracture development reservoir (see fig. 5 b).
For fractured tight sandstone gas reservoirs, different reservoir types have obvious difference on well testing characteristics and later-stage production characteristics, specifically, due to the fact that fracture dimensions of fractured developing reservoirs are large and the extension distance in the reservoirs is long, straight-line segments with obvious slope of 1/2 appear at the rear section of a pressure derivative curve of a well testing curve, and due to the fact that matrixes are tight, the well testing curve has no obvious radial flow characteristics, and the production characteristics show that the initial-stage capacity is high; due to the relatively small size of the fracture and the relatively short extension distance in the reservoir, the pressure derivative curve of the well testing curve has a obviously concave 'dual medium' characteristic, and the production characteristic shows that the initial productivity is relatively low.
Step S300: and inputting the crack line density parameter into a pre-established crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type in the work area to obtain an initial unobstructed flow parameter of a new well target section drilled in the work area.
The fracture line density parameter-unobstructed flow parameter relation model is a function of an independent variable which is a fracture line density parameter and a dependent variable which is an unobstructed flow parameter, or an empirical equation.
According to the technical scheme, the method for determining the initial unobstructed flow parameter of the target well section of the fractured tight sandstone gas reservoir drilled by the new well is characterized in that the density parameter of the fracture line of the target well section drilled by the new well is input into a pre-established model of the reservoir type corresponding to the target well section in a work area to obtain the corresponding unobstructed flow parameter, so that the initial unobstructed flow parameter of the gas well can be accurately determined under the condition of non-well completion test, the problems of high difficulty and low precision in determining the initial unobstructed flow parameter of the fractured tight sandstone gas reservoir drilled by the new well are solved, the initial production allocation scale of the fractured tight sandstone gas reservoir drilled by the type of gas reservoir can be guided, and the construction risk caused by the well completion test can be avoided.
Fig. 6 is a schematic flow chart of a method for determining an initial unobstructed flow parameter of a target well section of a fractured tight sandstone gas reservoir after drilling a new well in the embodiment of the invention. Referring to fig. 6, the method for determining the initial non-resistance flow parameter of the target well section of the fractured tight sandstone gas reservoir after completing drilling the new well may further include, on the basis of the method for determining the initial non-resistance flow parameter of the target well section of the fractured tight sandstone gas reservoir after completing drilling the new well, as shown in fig. 3:
step S10: and establishing a relation model of crack line density parameter-unobstructed flow parameter in the work area.
Specifically, when a fracture line density parameter-unobstructed flow parameter relation model is established, data of a plurality of production wells in a work area where the drilled new well is located and the same reservoir type as a target well section of the drilled new well are found, an internal relation between the unobstructed flow parameter of the reservoir type and the fracture line density parameter is found according to the data, and then the initial unobstructed flow parameter of the drilled new well can be obtained according to the internal relation and the fracture line density parameter of the target well section of the drilled new well.
In an alternative embodiment, referring to fig. 7, the step S10 may specifically include the following contents:
step S11: and acquiring logging interpretation results and well completion interpretation data of target well sections of a plurality of production wells in a work area where the completely drilled new well is located, wherein the reservoir type of the target well section of the production well is the same as that of the target well section of the completely drilled new well, the logging interpretation results comprise fracture line density parameters, and the well completion test interpretation data comprise unobstructed flow parameters.
The well log interpretation results include a variety of parameters, such as: porosity, number of cracks, crack porosity, crack permeability, etc., of which crack line density parameter is one.
It should be noted that the geological conditions such as the type of gas reservoir and the formation zone (zone) are the same in the same work area.
Step S12: performing regression analysis on the fracture line density parameters and the unobstructed flow parameters of the target well sections of the multiple production wells in the work area to obtain a fracture line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type, referring to fig. 8, circles in the graph represent data of a fracture development reservoir, triangles represent data of a fracture development reservoir, and straight lines represent respective fracture line density parameter-unobstructed flow parameter relation models (also referred to as empirical equations) thereof, as follows:
the empirical equation for a fractured developmental reservoir is: q AOF ＝2685.82×m+6.44。
The empirical equation for a fracture-developing reservoir is: q AOF ＝457.64×m+2.57。
Q AOF The unit of the initial unobstructed flow of the gas well is 10 4 m 3 /d；
And m is the density of fracture lines explained by gas well imaging logging, and the unit is strip/m.
In this example, the density parameter of the fracture line of the target well section of the completed new well is 0.21, the reservoir type of the completed new well is a fracture development reservoir, the density parameter of the fracture line of the target well section of the completed new well is substituted into the regression analysis to obtain an empirical equation of the fracture development reservoir, and the initial unobstructed flow parameter of the completed new well is calculated to be 98.7 × 10 4 m 3 /d。
Specifically, the fracture line density parameter and the unobstructed flow parameter of the target interval of the production well of a certain reservoir type are identified in a coordinate system, regression analysis (or called curve fitting) is then performed, and a relational graph of the fracture line density parameter of the target interval and the unobstructed flow parameter of the well completion test, that is, a fracture line density parameter-unobstructed flow parameter relational model (also called an empirical equation) is drawn.
The linear regression is a statistical analysis method for determining the interdependent quantitative relationship between two or more variables by using regression analysis in mathematical statistics, and the expression form of the linear regression is y = w 'x + e, wherein x is an independent variable, namely a crack line density parameter, y is a dependent variable, namely a non-resistance flow parameter, w' is a coefficient obtained by fitting, and e is normal distribution with an error obedient mean value of 0.
In another alternative embodiment, referring to fig. 9, the step S10 may further include the following content on the basis of the whole content of the step S10 shown in fig. 7:
step S11a: and acquiring well test curves of target well sections of all production wells of a work area where the completed new well is located.
Wherein, the well test curve and the well logging interpretation result are known.
Step S11b: and determining the reservoir type of the target well section of the production well according to the well testing curve of the target well section of the production well.
The reservoir type can be distinguished according to a well testing curve, and can be divided into a fracture development type and a fracture development type.
Specifically, the principle of determining the reservoir type of the target interval of the production well according to the well testing curve of the target interval of the production well is the same as the principle of determining the reservoir type of the target interval of the completely drilled new well according to the well testing curve of the target interval of the completely drilled new well, which is referred to above and is not described herein again.
It should be noted that if the new well is drilled halfway, the reservoir type is judged to be a fracture development reservoir or a fracture development reservoir according to the halfway test well testing curve, and if the new well is not drilled halfway, the reservoir type of the well is determined according to the reservoir type of the adjacent well.
Of course, as can be understood by those skilled in the art, before determining the initial unobstructed flow parameter of the target well section of the fractured tight sandstone gas reservoir complete drilling of the new well, the fracture line density parameter-unobstructed flow parameter relation models of different reservoir types can be obtained according to the data of the production well of the work area where the complete drilling new well is located, and when determining the initial unobstructed flow parameter of the target well section of the complete drilling new well in the work area, the fracture line density parameter-unobstructed flow parameter relation model is directly applied, so that the initial unobstructed flow parameter of the target well section of the complete drilling new well can be quickly obtained.
Based on the content, the initial unobstructed flow parameter determining method for the target well section of the fractured compact sandstone gas reservoir drilled new well is tried on a certain drilled new well in the development process of the Crashu ultra-deep complex fractured gas reservoir in the Tarim basin, and the initial unobstructed flow parameter obtained by the existing method is 99.18 multiplied by 10 4 m 3 And d, verifying the accuracy of determining the initial unobstructed flow parameter of the new well target section drilled by the fractured tight sandstone gas reservoir provided by the embodiment of the invention, completely applying the method in actual construction, accurately determining the initial unobstructed flow parameter of the gas well under the condition of no well completion test, and having good application prospect.
Based on the same inventive concept, the embodiment of the application further provides a device for determining the initial unobstructed flow parameter of the fractured tight sandstone gas reservoir during the completion of the new well target section, which can be used for implementing the method described in the embodiment, as described in the following embodiment. The principle of solving the problems of the initial non-resistance flow parameter determination device for the new well target section drilled by the fractured tight sandstone gas reservoir is similar to that of the method, so that the implementation of the initial non-resistance flow parameter determination device for the new well target section drilled by the fractured tight sandstone gas reservoir can refer to the implementation of the method, and repeated parts are not described again. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware or a combination of software and hardware is also possible and contemplated.
Fig. 10 is a structural block diagram of the initial unobstructed flow parameter determination device for the target well section of the fractured tight sandstone gas reservoir after drilling the new well in the embodiment of the invention. As shown in fig. 10, the device for determining the initial unobstructed flow parameter of the fractured tight sandstone gas reservoir after drilling the new well target section comprises: a completed new well data acquisition module 10, a completed new well reservoir type determination module 20, and an unobstructed flow parameter determination module 30.
The new well completion data acquisition module 10 acquires a well test curve and a well logging interpretation result of a new well completion target well section in a work area, wherein the well logging interpretation result comprises a crack line density parameter.
Wherein, the well test curve and the well logging interpretation result are known, and the well logging interpretation result comprises various parameters, such as: porosity, number of cracks, crack porosity, crack permeability, etc., of which crack line density parameter is one.
And the complete new well reservoir type determining module 20 determines the reservoir type of the complete new well target well section according to the well testing curve of the complete new well target well section in the work area.
The reservoir type can be distinguished according to a well testing curve, and can be divided into a fracture development type and a fracture development type.
Specifically, the reservoir type of the target interval of the production well is determined according to the well testing curve of the target interval of the production well, which is described above and is not described herein again.
The unobstructed flow parameter determination module 30 inputs the crack line density parameter into a pre-established crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type in the work area, and obtains an initial unobstructed flow parameter of a target well section of a new well finished in the work area.
The relation model of the crack line density parameter-unobstructed flow parameter is a function with an independent variable as the crack line density parameter and a dependent variable as the unobstructed flow parameter, or called an empirical equation.
According to the technical scheme, the initial unobstructed flow parameter determining device for the new fractured tight sandstone gas reservoir drilled new well section provided by the embodiment of the invention has the advantages that the density parameter of the fracture line of the new fractured tight sandstone gas reservoir drilled new well section is input into the pre-established model of the reservoir type corresponding to the target well section in the work area, so that the corresponding unobstructed flow parameter is obtained, the initial unobstructed flow parameter of the gas well can be accurately determined under the condition of non-well completion test, the problems of high difficulty and low precision in determining the initial unobstructed flow parameter of the new fractured tight sandstone gas reservoir drilled new well are solved, the initial production allocation scale of the new fractured tight sandstone gas reservoir drilled by the type can be guided, and meanwhile, the construction risk caused by the well completion test can be avoided.
In an optional embodiment, the determination device for the initial unobstructed flow rate parameter of the fractured tight sand gas reservoir after the new well target section is drilled may further include: and a modeling module.
The modeling module is used for establishing a relation model of density parameters and unobstructed flow parameters of the crack lines in the work area.
Specifically, when a fracture line density parameter-unobstructed flow parameter relation model is established, data of a plurality of production wells in a work area where the drilled new well is located and the same reservoir type as a target well section of the drilled new well are found, an internal relation between the unobstructed flow parameter of the reservoir type and the fracture line density parameter is found according to the data, and then the initial unobstructed flow parameter of the drilled new well can be obtained according to the internal relation and the fracture line density parameter of the target well section of the drilled new well.
In an alternative embodiment, the modeling module may include: a production well data acquisition unit and a regression analysis unit.
The production well data acquisition unit is used for acquiring logging interpretation results and well completion interpretation data of target well sections of a plurality of production wells in a work area where the completely drilled new well is located, the reservoir type of the target well sections of the production wells is the same as the reservoir type of the target well sections of the completely drilled new well, the logging interpretation results comprise fracture line density parameters, and the well completion test interpretation data comprise unobstructed flow parameters.
The well log interpretation results include a variety of parameters, such as: porosity, number of cracks, porosity of cracks, permeability of cracks, etc., of which the crack line density parameter is one.
It is to be noted that the geological conditions such as the gas reservoir type and the tectonic zone (zone) are the same in the same work area.
The regression analysis unit is used for carrying out regression analysis on the crack line density parameters and the unobstructed flow parameters of the target well sections of the multiple production wells in the work area to obtain a crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type.
Specifically, the fracture line density parameter and the unobstructed flow parameter of the target interval of the production well of a certain reservoir type may be identified in the coordinate system, and then regression analysis (or curve fitting) is performed to draw a relationship diagram between the fracture line density parameter of the target interval and the unobstructed flow parameter of the well completion test, that is, a fracture line density parameter-unobstructed flow parameter relationship model (also referred to as an empirical equation).
The linear regression is a statistical analysis method for determining the interdependent quantitative relationship between two or more variables by using regression analysis in mathematical statistics, and the expression form of the linear regression is y = w 'x + e, wherein x is an independent variable, namely a crack line density parameter, y is a dependent variable, namely a non-resistance flow parameter, w' is a coefficient obtained by fitting, and e is normal distribution with an error obedient mean value of 0.
In a further embodiment, the modeling module may further include: the device comprises a production well testing curve obtaining unit and a production well reservoir type determining unit.
The well test curve acquisition unit of the production well is used for acquiring the well test curves of the target well sections of all the production wells in the work area where the completed new well is located.
Wherein, the well test curve and the well logging interpretation result are known.
The production well reservoir type determining unit is used for determining the reservoir type of the target well section of the production well according to the well testing curve of the target well section of the production well.
The reservoir types can be distinguished according to well testing curves, and can be divided into fracture development types and fracture development types.
Specifically, the principle of determining the reservoir type of the target well section of the production well according to the well testing curve of the target well section of the production well is the same as the principle of determining the reservoir type of the target well section of the completely drilled new well according to the well testing curve of the target well section of the completely drilled new well, which is referred to above and is not described herein again.
Of course, as can be understood by those skilled in the art, before determining the initial unobstructed flow parameter of the target well section of the fractured tight sandstone gas reservoir complete drilling of the new well, the fracture line density parameter-unobstructed flow parameter relation models of different reservoir types can be obtained according to the data of the production well of the work area where the complete drilling new well is located, and when determining the initial unobstructed flow parameter of the target well section of the complete drilling new well in the work area, the fracture line density parameter-unobstructed flow parameter relation model is directly applied, so that the initial unobstructed flow parameter of the target well section of the complete drilling new well can be quickly obtained.
The apparatuses, modules or units illustrated in the above embodiments may be specifically implemented by a computer chip or an entity, or implemented by a product with certain functions. 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 specifically comprises a memory, a processor and a computer program stored on the memory and executable on the processor, and the processor implements the following steps when executing the program:
acquiring a well testing curve and a well logging interpretation result of a new well target well section drilled in a work area, wherein the well logging interpretation result comprises a crack line density parameter;
determining the reservoir type of the target well section of the finished new well according to the well testing curve of the target well section of the finished new well in the work area;
and inputting the crack line density parameter into a pre-established crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type in the work area to obtain an initial unobstructed flow parameter of a new well target section drilled in the work area.
As can be seen from the above description, the electronic device provided in the embodiment of the present invention may be used to determine the initial unobstructed flow parameter of the target well section of the fractured tight sandstone gas reservoir after completion of drilling the new well, and obtain the corresponding unobstructed flow parameter by inputting the density parameter of the fracture line of the target well section after completion of drilling the new well into the pre-established model corresponding to the reservoir type of the target well section in the work area, so as to accurately determine the initial unobstructed flow parameter of the gas well under the condition of non-completion test, solve the problems of great difficulty and low precision in determining the initial unobstructed flow parameter of the fractured tight sandstone gas reservoir after completion of drilling the new well, facilitate guidance of the initial production allocation scale of the fractured tight sandstone gas reservoir of the type, and simultaneously avoid the construction risk caused by the completion test.
Referring now to FIG. 11, shown is a schematic diagram of an electronic device 600 suitable for use in implementing embodiments of the present application.
As shown in fig. 11, the electronic apparatus 600 includes a Central Processing Unit (CPU) 601 that can perform various appropriate jobs 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 necessary for the operation of the system 600 are also stored. The CPU601, ROM602, and RAM603 are connected to each other via 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, a mouse, and the like; an output portion 607 including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker; 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. A driver 610 is also connected to the I/O interface 606 as needed. A removable medium 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 610 as necessary, so that the computer program read out therefrom is mounted as necessary in the storage section 608.
In particular, according to an embodiment of the present invention, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, an embodiment of the invention includes a computer-readable storage medium having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring a well testing curve and a well logging interpretation result of a new well target well section drilled in a work area, wherein the well logging interpretation result comprises a crack line density parameter;
determining the reservoir type of the target well section of the completed new well according to the well testing curve of the target well section of the completed new well in the work area;
and inputting the crack line density parameter into a pre-established crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type in the work area to obtain an initial unobstructed flow parameter of a target well section of a new well drilled in the work area.
As can be seen from the above description, the computer-readable storage medium provided in the embodiment of the present invention may be used to determine an initial unobstructed flow parameter of a target well section of a fractured tight sandstone gas reservoir after drilling of the new well, and obtain a corresponding unobstructed flow parameter by inputting a density parameter of a fracture line of the target well section of the drilled tight sandstone gas reservoir into a pre-established model of a reservoir type corresponding to the target well section in a work area, so as to accurately determine the initial unobstructed flow parameter under a non-well completion test condition, solve the problems of high difficulty and low precision in determining the initial unobstructed flow parameter of the fractured tight sandstone gas reservoir after drilling of the new well, facilitate guidance of an initial production allocation scale of the fractured tight sandstone gas reservoir of the type after drilling of the new well, and avoid a construction risk caused by the well completion test.
In such an embodiment, the computer program may be downloaded and installed from a network through the communication section 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 computer storage media 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 that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the various elements may be implemented in the same one or more pieces of software and/or hardware in the practice of the present application.
The present invention has been 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises that element.
As will be appreciated by one skilled in the art, 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 so forth) 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.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (6)
1. A method for determining an initial unobstructed flow parameter of a target well section of a fractured tight sandstone gas reservoir after drilling of a new well is characterized by comprising the following steps:
acquiring a well testing curve and a well logging interpretation result of a new well target well section drilled in a work area, wherein the well logging interpretation result comprises a crack line density parameter;
determining the reservoir type of the target well section of the finished new well according to the well testing curve of the target well section of the finished new well in the work area;
inputting the crack line density parameter into a pre-established crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type in the work area to obtain an initial unobstructed flow parameter of a target well section of a new well drilled in the work area;
wherein the method further comprises:
establishing a relation model of density parameters and unobstructed flow parameters of crack lines in a work area;
the establishing of the relation model of the density parameter and the unobstructed flow parameter of the crack line in the work area comprises the following steps:
acquiring logging interpretation results and well completion interpretation data of target well sections of a plurality of production wells in a work area where the completely drilled new well is located, wherein the reservoir type of the target well section of the production well is the same as that of the target well section of the completely drilled new well, the logging interpretation results comprise crack line density parameters, and the well completion test interpretation data comprise unobstructed flow parameters;
carrying out regression analysis on the crack line density parameters and the unobstructed flow parameters of the target well sections of a plurality of production wells in the work area to obtain a crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type;
the establishing of the relation model of the density parameter of the crack line in the work area and the unobstructed flow parameter further comprises the following steps:
acquiring well test curves of target well sections of all production wells of a work area where the completed new well is located;
and determining the reservoir type of the target well section of the production well according to the well testing curve of the target well section of the production well.
2. The method for determining the initial unobstructed flow parameter for the target interval of the fractured tight sandstone gas reservoir drilled new well according to claim 1, wherein the reservoir types comprise fracture development types and fracture development types.
3. The utility model provides a crack nature tight sandstone gas reservoir finishes drilling new well target well section initial stage does not have resistance flow parameter determination device which characterized in that includes:
the new well drilling completion data acquisition module is used for acquiring a well testing curve and a well logging interpretation result of a new well drilling completion target well section in a work area, wherein the well logging interpretation result comprises a crack line density parameter;
the reservoir type determination module of the finished new well determines the reservoir type of the target well section of the finished new well according to the well testing curve of the target well section of the finished new well in the work area;
the unobstructed flow parameter determining module is used for inputting the crack line density parameter into a pre-established crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type in the work area to obtain an initial unobstructed flow parameter of a target well section of a new well drilled in the work area;
wherein the apparatus further comprises:
the modeling module is used for establishing a relation model between density parameters and unobstructed flow parameters of the crack lines in the work area;
wherein the modeling module comprises:
the production well data acquisition unit is used for acquiring logging interpretation results and well completion interpretation data of target well sections of a plurality of production wells in a work area where the completely drilled new well is located, wherein the reservoir type of the target well section of the production well is the same as that of the target well section of the completely drilled new well, the logging interpretation results comprise crack line density parameters, and the well completion test interpretation data comprise non-resistance flow parameters;
the regression analysis unit is used for carrying out regression analysis on the crack line density parameters and the unobstructed flow parameters of the target well sections of the multiple production wells in the work area to obtain a crack line density parameter-unobstructed flow parameter relation model corresponding to the reservoir type;
wherein the modeling module further comprises:
the production well test curve acquisition unit is used for acquiring test curves of target well sections of all production wells in a work area where the completed new well is located;
and the production well reservoir type determining unit is used for determining the reservoir type of the target well section of the production well according to the well testing curve of the target well section of the production well.
4. The apparatus of claim 3, wherein the reservoir types comprise a fracture development type and a fracture development type.
5. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of the method of determining an initial unobstructed flow parameter for drilling a target section of a new well for a fractured tight sand gas reservoir of claim 1 or 2.
6. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for determining an initial unobstructed flow parameter for completing drilling of a new target interval of a fractured tight sandstone gas reservoir according to claim 1 or 2.
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