CN111260100B - Reservoir production capacity prediction method and device - Google Patents
Reservoir production capacity prediction method and device Download PDFInfo
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- CN111260100B CN111260100B CN201811453012.4A CN201811453012A CN111260100B CN 111260100 B CN111260100 B CN 111260100B CN 201811453012 A CN201811453012 A CN 201811453012A CN 111260100 B CN111260100 B CN 111260100B
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Abstract
The invention discloses a method and a device for predicting reservoir production capacity, wherein the method comprises the following steps: acquiring the thickness of overlying limestone of a reservoir to be developed, wherein the thickness of the overlying limestone is acquired in real time in the drilling process of the reservoir to be developed; determining the unobstructed flow of the reservoir to be developed according to the thickness of the overlying limestone of the reservoir to be developed based on a relational model of the thickness of the overlying limestone and the unobstructed flow, wherein the unobstructed flow of the reservoir to be developed is used for representing the capacity of the reservoir to be developed, and the relational model of the thickness of the overlying limestone and the unobstructed flow is a relational model which is established in advance according to the thickness of the overlying limestone and the unobstructed flow of the reservoir to be developed. The invention provides a scheme for predicting the capacity of the reservoir without drilling, and realizes the technical effect of quickly predicting the capacity of the reservoir in the development and production stage.
Description
Technical Field
The invention relates to the field of oil and gas field development, in particular to a method and a device for predicting reservoir productivity.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
Productivity evaluation is an important basic work for oil and gas field development scheme design and reasonable production allocation of oil and gas wells. The current universal capacity evaluation method is to predict the productivity of the hydrocarbon reservoir by tightly combining dynamic and static data acquired on site. The static data mainly comprises seismic data, rock cores, well logging data and the like, the seismic data pay attention to the consideration of the layer of an area, from the development perspective, the description of a single well is often too low in resolution, the rock cores and the well logging data can only reflect the stratum characteristics in a very small area near the well wall, particularly, the actual situation is difficult to represent for a seam hole developed reservoir stratum, and the information provided by the static data only accounts for one billion of the whole information quantity of the reservoir stratum; the dynamic data mainly is well testing data which comprehensively reflects the flowing characteristics of the flowing in a sufficiently large stratum range, but well testing explanation faces the limitations of strong multi-solution and over-high precision requirement on pressure, and the problem is that the well testing data cannot be ignored in a highly complex carbonate reservoir.
The productivity evaluation of the existing reservoir (such as a carbonate gas reservoir) is carried out on the basis of reservoir characteristic recognition and on the basis of well testing information of a fracture-cavity reservoir, and a multi-medium model is adopted to carry out gas well productivity evaluation. The productivity evaluation method needs to define two data before accurate productivity prediction, on one hand, the development condition of a reservoir (including the type, the space and the connectivity of the reservoir) needs to be clarified, and on the other hand, unstable well testing needs to be carried out, so that an accurate multi-medium or single-heavy-medium model is established for capacity evaluation. Therefore, the existing reservoir productivity evaluation method has high requirements on data, and accurate reservoir productivity data can be obtained only by well logging, gas testing, well logging interpretation and model building after well drilling is completed.
Disclosure of Invention
The embodiment of the invention provides a method for predicting reservoir productivity, which is used for solving the technical problems that the conventional reservoir productivity assessment method has high requirement on data and cannot assess the reservoir productivity in a development and production stage, and comprises the following steps: acquiring the thickness of overlying limestone of a reservoir, wherein the thickness of the overlying limestone is acquired in real time in the drilling process of the reservoir; determining the unobstructed flow of the reservoir according to the thickness of the overlying limestone of the reservoir based on a relational model of the thickness of the overlying limestone and the unobstructed flow, wherein the unobstructed flow of the reservoir is used for representing the capacity of the reservoir, and the relational model of the thickness of the overlying limestone and the unobstructed flow is a relational model which is established in advance according to the thickness of the overlying limestone of the developed reservoir and the unobstructed flow; determining the unobstructed flow of the reservoir to be developed according to the thickness of the overlying limestone of the reservoir to be developed based on a relational model of the thickness of the overlying limestone and the unobstructed flow, wherein the method comprises the following steps: if the thickness of the overlying limestone of the reservoir to be developed is within the range of 0-5 m, calculating the unobstructed flow of the reservoir to be developed through a relation model as follows: 1417.6e -1.8811x (ii) a If the thickness of the overlying limestone of the reservoir to be developed is within the range of 5-20 m, calculating the unobstructed flow of the reservoir to be developed through a relation model as follows: 1980.5e -0.418x (ii) a If the overburden thickness of the reservoir to be developed is greater than the 20 meter range,calculating the unimpeded flow of the reservoir to be developed through the following relation model: 5269.7e -0.17x (ii) a Wherein y represents the unimpeded flow of the reservoir; x represents the overburden thickness of the reservoir.
The embodiment of the invention also provides a device for predicting the reservoir productivity, which is used for solving the technical problems that the existing reservoir productivity assessment method has high requirement on data and cannot assess the reservoir productivity in the development and production stage, and the device comprises: the device comprises a to-be-developed reservoir overlying limestone thickness obtaining module, a data acquisition module and a data processing module, wherein the to-be-developed reservoir overlying limestone thickness obtaining module is used for obtaining the overlying limestone thickness of a reservoir, and the overlying limestone thickness is obtained in real time in the drilling process of the reservoir; the unimpeded flow prediction module is used for determining the unimpeded flow of the reservoir according to the thickness of the overlying limestone of the reservoir based on a relational model of the thickness of the overlying limestone and the unimpeded flow, wherein the unimpeded flow of the reservoir is used for representing the productivity of the reservoir, and the relational model of the thickness of the overlying limestone and the unimpeded flow is a relational model which is established in advance according to the thickness of the overlying limestone and the unimpeded flow of the developed reservoir; the unobstructed flow prediction module for the reservoir to be developed comprises: the first predictor block is used for calculating the unobstructed flow of the reservoir to be developed through a following relation model if the thickness of the overlying limestone of the reservoir to be developed is within the range of 0-5 m: 1417.6e -1.8811x (ii) a The second prediction module is used for calculating the unobstructed flow of the reservoir to be developed through the following relation model if the thickness of the overlying limestone of the reservoir to be developed is within the range of 5-20 m: 1980.5e -0.418x (ii) a The third prediction module is used for calculating the unobstructed flow of the reservoir to be developed through the following relation model if the thickness of the overlying limestone of the reservoir to be developed is larger than the range of 20 meters: 5269.7e -0.17x (ii) a Wherein y represents the unimpeded flow of the reservoir; x represents the overburden thickness of the reservoir.
The embodiment of the invention also provides computer equipment for solving the technical problems that the existing reservoir capacity assessment method has high requirement on data and cannot assess the reservoir capacity in the development and production stage.
The embodiment of the invention also provides a computer-readable storage medium, which is used for solving the technical problems that the existing reservoir capacity assessment method has high requirement on data and cannot assess the reservoir capacity in the development and production stage.
In the embodiment of the invention, the unobstructed flow of the reservoir to be developed can be determined according to the overlying limestone thickness of the reservoir to be developed, which is obtained in the drilling process, by the pre-constructed relation model of the overlying limestone thickness and the unobstructed flow, and the unobstructed flow can represent the capacity of the reservoir to be developed, so that the embodiment of the invention provides a scheme for predicting the capacity of the reservoir without drilling, and realizes the technical effect of rapidly predicting the capacity of the reservoir in the development and production stage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
fig. 1 is a flow chart of a method for predicting reservoir productivity according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a floated limestone identification result provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a relationship between a thickness of the pumice limestone and an unobstructed flow rate according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a prediction result of a reservoir unobstructed flow rate of a reservoir to be developed according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a reservoir performance prediction apparatus provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
The embodiment of the present invention further provides a method for predicting reservoir productivity, fig. 1 is a flow chart of the method for predicting reservoir productivity provided in the embodiment of the present invention, and as shown in fig. 1, the method includes the following steps:
s101, acquiring the thickness of overlying limestone of a reservoir to be developed, wherein the thickness of the overlying limestone is acquired in real time in the drilling process of the reservoir to be developed;
s102, determining the unobstructed flow of the reservoir to be developed according to the overlying limestone thickness of the reservoir to be developed based on a relation model of the overlying limestone thickness and the unobstructed flow, wherein the unobstructed flow of the reservoir to be developed is used for representing the capacity of the reservoir to be developed, and the relation model of the overlying limestone thickness and the unobstructed flow is a relation model established in advance according to the overlying limestone thickness and the unobstructed flow of the developed reservoir.
It should be noted that the reservoir to be developed may be any formation having interconnected pores that allow for the storage and percolation of hydrocarbons therein. Before determining the non-resistance flow of the reservoir to be developed according to the overlying limestone thickness of the reservoir to be developed based on the relational model of the overlying limestone thickness and the non-resistance flow, the relational model established by the overlying limestone thickness and the non-resistance flow needs to be established, and the specific steps of establishing the relational model are as follows: acquiring the thickness of overlying limestone of a developed reservoir; acquiring the unimpeded flow of the developed reservoir; and constructing a relation model of the thickness of the overlying limestone and the unobstructed flow according to the thickness of the overlying limestone and the unobstructed flow of the developed reservoir.
As can be seen from the above, in the above embodiment of the present invention, after the thickness of the overburden limestone of the reservoir to be developed in the drilling process is obtained through the pre-constructed relation model of the thickness of the overburden limestone and the unobstructed flow, the unobstructed flow of the reservoir to be developed is determined according to the thickness of the overburden limestone of the reservoir to be developed, and the unobstructed flow can represent the capacity of the reservoir to be developed.
As an alternative embodiment, the embodiment of the present invention is described by taking a laminated karst reservoir as an example. The laminated karst reservoir refers to a karst reservoir with obvious laminated characteristics such as development scale of a pore and a body scale of the pore due to the fact that a carbonate stratum is subjected to atmospheric fresh water forest filtration or deep hydrothermal erosion in multiple stages with different durations and different influence ranges due to regional structure lifting, local structure lifting, sea level lowering and deep hydrothermal fluid channeling. The laminated karst includes a structurally unconformity karst (epibiotic karst), a sub-synbiotic karst and a synbiotic karst in the layer.
The laminated karst is affected by the non-integration of the two-stage structure, the corrosion degrees of the weathering crust at the two stages in different areas on the plane are different, and a non-integrated residual stratum at the two stages exists in a local area. The embodiment of the invention provides a method for predicting the productivity of a gas well of an overlapped karst reservoir aiming at overlapped karst formed by two-stage structure unconformity weathering crust, which comprises the steps of identifying the overlying limestone of an overlapped karst weathering crust reservoir of a gas reservoir in the early stage (namely the stage before the gas field development scheme is established, namely the stage mainly depending on the geological characteristics and the development characteristics of a gas field of an exploratory well and an evaluation well), establishing a relation chart of the thickness of the overlying limestone and the unimpeded flow of the exploratory well and the evaluation well in the early stage, and rapidly judging the unimpeded flow of the well according to the thickness of the overlying limestone of a new well. Under the influence of the characteristics of laminated karst, the characteristics of reservoir space such as development erosion pores, erosion enlarged seams, high-angle seams and the like in different areas have great difference, so that the thicknesses of seam-hole type, hole-hole type and pore type reservoir configurations and the proportion of various reservoir configurations in a gas reservoir production layer are different, and the productivity of a gas well is influenced. Therefore, the overlying limestone thickness can indirectly reflect the effective reservoir development condition of the underburden, and a relational graphic plate (for reflecting the relation between the overlying limestone thickness and the unobstructed flow) of the gas well is established by researching the relation between the overlying limestone thickness and the unobstructed flow of the completed well.
In the process of gas reservoir development and production, development and production area screening, well position optimization and track optimization can be carried out according to the high-resolution seismic data of the completed well, and then well drilling of the development well can be carried out. After a weathering crust reservoir is drilled in a development well, the thickness of the overlying limestone in the weathering crust reservoir can be rapidly analyzed according to logging while drilling and rock debris analysis, and the unobstructed flow of the well can be rapidly judged by combining the established chart of the relationship between the thickness of the overlying limestone and the unobstructed flow.
The S101 can identify the overlying limestone stratum according to the data of drilling, logging while drilling and the like of the reservoir to be developed, and the limestone stratum can be accurately identified by means of technical means such as logging, rock fragment logging and the like due to the obvious characteristics of rock fragments, logging and the like of the limestone stratum, so that the method is a well-established technology. Thus, the embodiment of the invention does not make important explanation for the identification of the limestone.
The embodiment of the invention takes the example of overlapping the rubus zone of the qi field of the Anyue in Sichuan basin as an example to explain the invention in detail, the rubus zone of the qi field of the xi zone is in the production capacity construction stage at present, 25 drilled wells (straight wells and highly deviated wells) are tested at present, and the unimpeded flow is 2-217.58 × 10 4 m 3 D, average 40X 10 4 m 3 And d, the yield difference of gas well test is large. The research on the gas well productivity control factors is relatively complex, the evaluation of the gas well productivity is difficult due to the relatively complex storage space, and meanwhile, the evaluation result has errors. Because the ground official network is constructed according to the gas well productivity in the gas reservoir development and production process, the construction of the ground official network is planned and designed according to the gas well productivity in different areas to a great extent. Therefore, the rapid prediction of the gas well productivity has very important significance for accelerating the gas reservoir production rhythm and designing the ground construction.
According to the reservoir productivity prediction method provided by the embodiment of the invention, firstly, the overlying limestone of the reservoir of the laminated karst weathering crust of the early exploration well and the evaluation well is recognized, the identifying result of the overlying limestone is shown in figure 2, 3 curtains of lifting motion of the crust of the upper part of the Yangzi area occur in the deposition period of the lamp shade group in the late earthquake and the deposition period of the wheat terrace group in the early frigid martial art, each curtain of motion causes lifting and denudation of the stratum, and an unconformity surface of the weathering crust is formed. The gulf motion I-curtain occurs at the end of the second stage of lamp deposition in the lamp shade group, as evidenced by the pseudo integration of regional clastic rocks in the lamp third stage onto dolomite in the lamp second stage. The second screen of the Fujiu Bay sport occurs at the end of the deposition period of the light shadow group, which is expressed by false integration contact between the light shadow group and the floor group of the lower frigid-martial-arts-units. The Tung Bay sports III screen occurs at the end of the deposition period of the early Han Wushi wheat terrace group, and is expressed as the false integration contact of the lower Han Wu Tong Tu Ma terrace group and the qionggu Temple group. The movement of the three-curtain tung bay is mainly expressed as lifting movement, 3 regional unconformity surfaces are formed and are respectively positioned between a lamp three section and a lamp two section of a light shadow group of a marmot system, between the light shadow group and a terrace group of a lower han martial system, and between the terrace group and a qionggu antenna group. The bay sports curtain I results in the development of a lamped two-stage karst reservoir, and the bay sports curtains ii and iii mostly have congruent characteristics over the area, resulting in the development of a lamped four-stage karst reservoir. The limestone section of the residual wheat terrace group is arranged between the two curtain unconformity surfaces, and the thickness of the limestone can be effectively identified according to the logging characteristics among the limestone, the cloud rock and the mudstone.
As both the limestone and the nephrite have lower GR values (a logging value, also called a gamma curve, which can reflect the mud content of the stratum), but the PE value of the limestone (a logging curve value, called a photoelectric absorption cross section value, which can be used for distinguishing the limestone and the nephrite) is higher than that of the dolomite, the overlying limestone can be effectively distinguished according to the PE value.
On the basis of limestone thickness identification, the overlying limestone thickness of a drilled well and the calculated non-resistance flow value can be fitted according to the tested well gas testing data, and a relation chart between the overlying limestone thickness and the non-resistance flow of a test well can be obtained, wherein as shown in fig. 3, the relation chart between the limestone thickness and the non-resistance flow has obvious segmentation characteristics:
stage I (limestone thickness 0 m):
and in the section II (the thickness of the limestone is 0-5 m), the fitting curve is as follows:
y＝1417.6e -1.8811x correlation coefficient R of fitting curve 2 ＝0.786；
In the section III (the thickness of the limestone is 5-20 m), the fitting curve is as follows:
y＝1980.5e -0.418x correlation coefficient R of fitting curve 2 ＝0.8991
Section IV (limestone thickness greater than 20 m), the fitted curve is:
y＝5269.7e -0.17x correlation coefficient R of fitting curve 2 ＝0.9846；
Where y represents the unimpeded flow of the reservoir in 10 units 4 m 3 D; x represents the overburden thickness of the reservoir in m.
As can be seen from the above, the correlation coefficient of each fitting equation is high (correlation coefficient of fitting curve, R) 2 Preferably, R is 1 2 0 represents the worst, and generally more than 0.7 is good), with better exemplary meaning. Thus, the above S102 may optionally include at least one of the following cases:
in the first situation, if the thickness of the overlying limestone of the reservoir to be developed is in the range of 0-5 m, calculating the unimpeded flow of the reservoir to be developed through the following relation model: 1417.6e -1.8811x ；
In the second situation, if the thickness of the overlying limestone of the reservoir to be developed is within the range of 5-20 m, calculating the unimpeded flow of the reservoir to be developed through the following relation model: 1980.5e -0.418x ；
In the third case, if the thickness of the overlying limestone of the reservoir to be developed is greater than the range of 20 meters, the unimpeded flow of the reservoir to be developed is calculated by the following relational model: 5269.7e -0.17x 。
For the gas reservoir development well, the overlying limestone thickness can be rapidly judged according to well drilling and well logging information in the well drilling process, and the thickness value is brought into the established template, so that the unimpeded flow of the well can be rapidly obtained. Fig. 4 is a schematic diagram of a prediction result of a non-resistance flow of a reservoir to be developed, where as shown in fig. 4, class II is a limestone well greater than 0 and less than or equal to 5 meters, class III is a limestone well greater than 5 meters and less than or equal to 20 meters, and class IV is a limestone well greater than 20 meters. It should be noted that, at present, the method cannot establish a corresponding fitting equation for a well (I section) with overburden limestone 0, and cannot quickly predict the unobstructed flow, and only after the well is drilled, can the productivity evaluation be performed by the traditional method.
Taking the newly drilled M well as an example, after the well reaches a target layer, judging that the thickness of overlying strata limestone of the well is 7.2 meters according to rock debris and logging-while-drilling information, finding that the well is in a III section according to an established relation chart, bringing the value into a relation model of the III section, and obtaining the unimpeded flow of a gas well, wherein the unimpeded flow of the gas well is 97.7 multiplied by 10 4 m 3 And d. After M wells are drilled, on the basis of obtaining more accurate logging and gas testing information, the open-flow rate of the well is obtained to be 102.5 multiplied by 10 through a binomial productivity equation 4 m 3 D, error 4.7%. It follows that the error is within an acceptable range by means of this method relative to the conventional method.
With the increase of well completion data, the accuracy of predicting the production performance can be continuously improved by optimizing the relation chart. Therefore, in order to improve the accuracy of reservoir length energy prediction according to an embodiment of the present invention, in an optional embodiment, the method may further include: and updating a relation model of the thickness of the overlying limestone and the unobstructed flow according to the thickness of the overlying limestone and the unobstructed flow of the reservoir to be developed after drilling is completed.
Compared with the existing reservoir productivity evaluation method, the reservoir productivity prediction scheme provided by the embodiment of the invention only needs static data of the thickness of the overlying limestone, and has less requirements on the data. In addition, the gas well is not drilled, the logging and gas testing work is not needed, the rapid productivity evaluation can be carried out after the gas well meets the target layer in the early drilling, the workload is small, and the method is simple and easy to implement.
The embodiment of the invention also provides a device for predicting the reservoir productivity, which is described in the following embodiment. Because the principle of solving the problems by the modules is similar to the method for predicting the productivity of the reservoir, the implementation of the modules can be referred to the implementation of the method, and repeated details are not repeated.
Fig. 5 is a schematic diagram of a device for predicting reservoir productivity according to an embodiment of the present invention, as shown in fig. 5, the device includes:
the overburden limestone thickness obtaining module 51 is used for obtaining the overburden limestone thickness of the reservoir to be developed, wherein the overburden limestone thickness is the overburden limestone thickness obtained in real time in the drilling process of the reservoir to be developed;
the reservoir unobstructed flow prediction module 52 is configured to determine the unobstructed flow of the reservoir to be developed according to the thickness of the overlying limestone of the reservoir to be developed based on a relational model between the thickness of the overlying limestone and the unobstructed flow, where the unobstructed flow of the reservoir to be developed is used to represent the capacity of the reservoir to be developed, and the relational model between the thickness of the overlying limestone and the unobstructed flow is a relational model that is established in advance according to the thickness of the overlying limestone and the unobstructed flow of the reservoir that has been developed.
As can be seen from the above, in the above embodiment of the present invention, after the pre-constructed relation model between the thickness of the overlying limestone and the unobstructed flow is obtained by the overlying limestone thickness obtaining module 51 of the reservoir to be developed in the drilling process, the unobstructed flow of the reservoir to be developed is determined according to the thickness of the overlying limestone of the reservoir to be developed by the unobstructed flow prediction module 52 of the reservoir to be developed based on the pre-constructed relation model between the thickness of the overlying limestone and the unobstructed flow, and the unobstructed flow can represent the capacity of the reservoir to be developed, so that according to the embodiment of the present invention, a scheme capable of predicting the capacity of the reservoir without completing drilling is provided, and a technical effect of rapidly predicting the capacity of the reservoir in the development and production stage is achieved.
In an alternative embodiment, the reservoir-to-be-developed unimpeded flow prediction module 52 includes: the first predictor block 521 is used for calculating the unimpeded flow of the reservoir to be developed through the following relation model if the thickness of the overlying limestone of the reservoir to be developed is in the range of 0-5 m: 1417.6e -1.8811x (ii) a The second prediction module 522 is used for calculating the unobstructed flow of the reservoir to be developed through the following relation model if the thickness of the overlying limestone of the reservoir to be developed is within the range of 5-20 m: 1980.5e -0.418x (ii) a A third prediction module 523, configured to calculate an unobstructed flow of the reservoir to be developed through the following relationship model if the thickness of the overlying limestone of the reservoir to be developed is greater than the range of 20 meters: 5269.7e -0.17x (ii) a Wherein y represents the unimpeded flow of the reservoir; x represents the overburden thickness of the reservoir.
In an optional embodiment, the apparatus may further include: and the relational model updating module 53 is used for updating the relational model of the thickness of the overlying limestone and the unimpeded flow according to the thickness of the overlying limestone and the unimpeded flow after the drilling of the reservoir to be developed is completed.
In an optional embodiment, the apparatus may further include: an overburden limestone thickness acquisition module 54 for acquiring overburden limestone thickness of the developed reservoir; the developed reservoir unobstructed flow acquisition module 55 is used for acquiring the unobstructed flow of the developed reservoir; and the relational model building module 56 is used for building a relational model of the thickness of the overlying limestone and the unobstructed flow according to the thickness of the overlying limestone and the unobstructed flow of the developed reservoir.
As an alternative embodiment, the reservoir to be developed in the above-mentioned embodiment of the apparatus may be a laminated karst reservoir.
Embodiments of the present invention further provide a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the processor implements any one of the optional or preferred methods for predicting reservoir performance in the above method embodiments.
Embodiments of the present invention also provide a computer readable storage medium storing a computer program for executing any one of the optional or preferred reservoir property prediction methods in the above method embodiments.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the 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.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for predicting reservoir productivity, comprising:
acquiring the thickness of overlying limestone of a reservoir to be developed, wherein the thickness of the overlying limestone is acquired in real time in the drilling process of the reservoir to be developed;
determining the unobstructed flow of the reservoir to be developed according to the thickness of the overlying limestone of the reservoir to be developed based on a relational model of the thickness of the overlying limestone and the unobstructed flow, wherein the unobstructed flow of the reservoir to be developed is used for representing the capacity of the reservoir to be developed, and the relational model of the thickness of the overlying limestone and the unobstructed flow is a relational model which is established in advance according to the thickness of the overlying limestone and the unobstructed flow of the reservoir to be developed;
determining the unobstructed flow of the reservoir to be developed according to the thickness of the overlying limestone of the reservoir to be developed based on a relational model of the thickness of the overlying limestone and the unobstructed flow, wherein the method comprises the following steps:
if the thickness of the overlying limestone of the reservoir to be developed is within the range of 0-5 m, calculating the unobstructed flow of the reservoir to be developed through a relation model as follows: 1417.6e -1.8811x ；
If the thickness of the overlying limestone of the reservoir to be developed is within the range of 5-20 m, calculating the unobstructed flow of the reservoir to be developed through a relation model as follows: 1980.5e -0.418x ；
If the thickness of the overlying limestone of the reservoir to be developed is larger than the range of 20 meters, calculating the unobstructed flow of the reservoir to be developed through a relation model as follows: 5269.7e -0.17x ；
Wherein y represents the unimpeded flow of the reservoir; x represents the overburden thickness of the reservoir.
2. The method of claim 1, wherein the method further comprises:
and updating a relation model of the thickness of the overlying limestone and the unobstructed flow according to the thickness of the overlying limestone and the unobstructed flow of the reservoir to be developed after drilling is completed.
3. The method of claim 1, wherein prior to determining the unobstructed flow for the reservoir to be developed from the overburden thickness of the reservoir to be developed based on a model of overburden thickness versus unobstructed flow, the method further comprises:
acquiring the thickness of overlying limestone of a developed reservoir;
obtaining the unimpeded flow of the developed reservoir;
and constructing a relation model of the overlying limestone thickness and the unobstructed flow according to the overlying limestone thickness and the unobstructed flow of the developed reservoir.
4. A method according to any one of claims 1 to 3, wherein the reservoir to be developed is a laminated karst reservoir.
5. An apparatus for predicting reservoir productivity, comprising:
the device comprises an overlying limestone thickness acquisition module for a reservoir to be developed, wherein the overlying limestone thickness acquisition module is used for acquiring the overlying limestone thickness of the reservoir to be developed, and the overlying limestone thickness is acquired in real time in the drilling process of the reservoir to be developed;
the reservoir unobstructed flow prediction module is used for determining the unobstructed flow of the reservoir to be developed according to the overlying limestone thickness of the reservoir to be developed based on a relation model of the overlying limestone thickness and the unobstructed flow, wherein the unobstructed flow of the reservoir to be developed is used for representing the capacity of the reservoir to be developed, and the relation model of the overlying limestone thickness and the unobstructed flow is a relation model established in advance according to the overlying limestone thickness and the unobstructed flow of the reservoir to be developed;
the unobstructed flow prediction module for the reservoir to be developed comprises:
the first predictor block is used for calculating the unobstructed flow of the reservoir to be developed through a following relation model if the thickness of the overlying limestone of the reservoir to be developed is within the range of 0-5 m: 1417.6e -1.8811x ；
A second prediction module, e.g. forIf the thickness of the overlying limestone of the reservoir to be developed is within the range of 5-20 m, calculating the unobstructed flow of the reservoir to be developed through a relation model as follows: 1980.5e -0.418x ；
The third prediction module is used for calculating the unobstructed flow of the reservoir to be developed through the following relation model if the thickness of the overlying limestone of the reservoir to be developed is larger than the range of 20 meters: 5269.7e -0.17x ；
Wherein y represents the unimpeded flow of the reservoir; x represents the overburden thickness of the reservoir.
6. The apparatus of claim 5, wherein the apparatus further comprises: and the relational model updating module is used for updating the relational model of the thickness of the overlying limestone and the unimpeded flow according to the thickness of the overlying limestone and the unimpeded flow of the reservoir to be developed after drilling is completed.
7. The apparatus of claim 5, wherein the apparatus further comprises:
the overlying limestone thickness acquisition module is used for acquiring the overlying limestone thickness of the developed reservoir;
the developed reservoir unobstructed flow acquisition module is used for acquiring the unobstructed flow of the developed reservoir;
and the relational model building module is used for building a relational model of the overlying limestone thickness and the unobstructed flow according to the overlying limestone thickness and the unobstructed flow of the developed reservoir.
8. The apparatus of any one of claims 5 to 7, wherein the reservoir to be developed is a laminated karst reservoir.
9. A computer 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 computer program implements the method of predicting reservoir production as claimed in any one of claims 1 to 4.
10. A computer-readable storage medium storing a computer program for executing the method for predicting reservoir productivity of any one of claims 1 to 4.
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