CN111411946A - Method and device for determining exploitation mode of tight gas reservoir gas well - Google Patents
Method and device for determining exploitation mode of tight gas reservoir gas well Download PDFInfo
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Abstract
The embodiment of the specification provides a method and a device for determining a mining mode of a tight gas reservoir gas well. The method comprises the following steps: obtaining economic parameters of a compact gas reservoir gas well and physical parameters of each gas layer; judging whether each gas layer is a combined gas layer suitable for multi-layer combined production according to the economic parameters and the physical parameters; under the condition that the combined gas production layer is judged to be suitable for multi-layer combined production, the production allocation range of each gas layer in the combined gas production layer is given based on the physical property parameters; and determining the bottom hole flow pressure when the multi-layer commingled production is carried out on the commingled production gas layer according to the production allocation range, thereby improving the accuracy of determining the exploitation mode of the tight gas reservoir gas well.
Description
Technical Field
The embodiment of the specification relates to the field of oil and gas field development, in particular to a method and a device for determining a gas well exploitation mode of a tight gas reservoir.
Background
The unconventional natural gas refers to natural gas which cannot be exploited for profitability in a specific period for various reasons, can be converted into conventional natural gas at a certain stage, and is stored in the form of coal bed gas, shale gas, water-soluble gas, natural gas hydrate, inorganic gas, shallow biogas, dense gas and the like at the present stage. Because the cause and the accumulation mechanism of the natural gas are different from those of the conventional natural gas, the development difficulty is higher. The dense gas is unconventional natural gas, has the characteristics of low porosity, low permeability, low gas saturation, high water saturation and the like, and is mainly stored in low-permeability or ultra-low-permeability sandstone reservoirs.
At present, along with the great improvement of the energy requirements of China on petroleum, natural gas and the like and the reduction of the production capacity of conventional gas fields, the nation starts to explore and develop unconventional natural gas including dense gas. The dense gas resources are widely distributed in China and have important strategic position. The dense gas reservoir in China has the characteristics of poor physical property, development of multilayer systems, low abundance of single-layer reserves, great exploitation difficulty and the like. In order to increase the productivity, a plurality of gas layers with similar characteristics and adjacent to each other in the longitudinal direction are combined together and developed in a combined manner.
Physical properties between layers of a tight gas reservoir well are generally: the permeability, porosity, height, pressure and the like are different, so that interference and even backflow between gas layers are generated when multiple layers of commingled production is carried out, and the phenomenon usually occurs in the field actual production process.
When a tight gas reservoir gas well is exploited in a multi-layer commingled production development mode, the yield of the multi-layer commingled production is usually far lower than the sum of the yields of the stratified single productions. Therefore, the determination of a definite multi-layer commingling principle has important significance for field multi-layer gas well development.
Disclosure of Invention
The embodiment of the specification aims to provide a method and a device for determining a tight gas reservoir gas well exploitation mode, so as to improve the accuracy of determining the tight gas reservoir gas well exploitation mode.
In order to solve the above problems, embodiments of the present disclosure provide a method and an apparatus for determining a tight gas reservoir gas well exploitation mode.
A method of determining a tight gas reservoir gas well production pattern, the method comprising: obtaining economic parameters of a compact gas reservoir gas well and physical parameters of each gas layer; judging whether each gas layer is a combined gas layer suitable for multi-layer combined production according to the economic parameters and the physical parameters; under the condition that the combined gas production layer is judged to be suitable for multi-layer combined production, the production allocation range of each gas layer in the combined gas production layer is given based on the physical property parameters; and determining the bottom hole flow pressure when the combined production gas layer is subjected to multi-layer combined production according to the production allocation range.
An apparatus for determining a tight gas reservoir well recovery pattern, the apparatus comprising: the acquisition module is used for acquiring economic parameters of the compact gas reservoir gas well and physical parameters of each gas layer; the judgment module is used for judging whether each gas layer is a combined gas layer suitable for multi-layer combined production according to the economic parameters and the physical parameters; the giving module is used for giving the production allocation range of each gas layer in the combined gas production layer based on the physical property parameters under the condition that the combined gas production layer suitable for multi-layer combined production is judged; and the determining module is used for determining the bottom hole flow pressure when the multi-layer commingled production is carried out on the commingled production gas layer according to the production allocation range.
According to the technical scheme provided by the embodiment of the specification, the economic parameters of the tight gas reservoir and the physical parameters of each gas layer can be obtained; judging whether each gas layer is a combined gas layer suitable for multi-layer combined production according to the economic parameters and the physical parameters; under the condition that the combined gas production layer is judged to be suitable for multi-layer combined production, the production allocation range of each gas layer in the combined gas production layer is given based on the physical property parameters; and determining the bottom hole flow pressure when the combined production gas layer is subjected to multi-layer combined production according to the production allocation range. The method for determining the gas well exploitation mode of the compact gas reservoir provided by the embodiment of the specification considers the influence of physical property parameters of each gas layer on multi-layer commingled exploitation, particularly the original pressure of the stratum, calculates the reasonable production allocation range and the reasonable bottom-hole flow pressure range of each gas layer, establishes a model for judging whether each gas layer can carry out multi-layer commingled exploitation, is simple in calculation, strong in operability, comprehensive in consideration and high in accuracy, can determine the bottom-hole flow pressure under the condition of multi-layer commingled exploitation, and lays a foundation for the actual development of an oil field.
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In order to more clearly illustrate the embodiments of the present specification 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 described in the specification, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for determining a tight gas reservoir well production pattern according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram showing the relationship between physical property parameters of three gas layers of a well in example X-1 of the present specification;
FIG. 3 is a schematic diagram showing the positional relationship of three gas beds in a well X-1 according to an embodiment of the present disclosure;
fig. 4 is a functional block diagram of a device for determining a tight gas reservoir gas well exploitation mode according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present specification without any creative effort shall fall within the protection scope of the present specification.
The rational exploitation mode of the tight gas reservoir gas well can comprise multilayer commingling production and single production. The reasonable development mode of the tight gas reservoir can be determined through well testing analysis, numerical simulation prediction, a gas well interlayer interference coefficient method and the like. Wherein, the well testing analysis method needs relatively complete well testing data; the numerical simulation method needs a model with higher precision, and the fitting process is time-consuming; parameters required to be obtained by the interlayer interference coefficient method are difficult to obtain in the actual oilfield formulation process. Considering that if the gas layer is judged to be suitable for multi-layer commingled production according to factors such as the gas producible amount of the gas layer, the exploitation cost and the like, the production allocation range and the bottom hole flow pressure range of each gas layer are determined according to reservoir physical property parameters such as the original pressure of each gas layer, and the bottom hole flow pressure during multi-layer commingled production is further determined, the problems that in the determination method for the reasonable development mode of the compact gas reservoir gas well in the prior art, the parameters are difficult to obtain, the time consumption process is long, the analysis is not comprehensive enough and the like are hopefully solved, and the accuracy of the determination of the development mode.
In an embodiment of the present specification, a main body of the method for determining a tight gas reservoir gas well development manner may be an electronic device with a logical operation function, where the electronic device may be a server or a client, and the client may be a desktop computer, a tablet computer, a notebook computer, a workstation, and the like. Of course, the client is not limited to the electronic device with certain entities, and may also be software running in the electronic device. It may also be program software formed by program development, which may be run in the above-mentioned electronic device.
Fig. 1 is a flowchart illustrating a method for determining a tight gas reservoir gas well development method according to an embodiment of the present disclosure. As shown in fig. 1, the method for determining the tight gas reservoir gas well development mode may include the following steps.
S110: and acquiring economic parameters of the compact gas reservoir gas well and physical parameters of each gas layer.
In some embodiments, the economic parameters may include parameters that can characterize production costs, such as qualitative drilling costs, variable operating costs, production years, and annual fixed operating costs; the economic parameters may also include parameters that can characterize the recovery yield, such as gas unit cost, recovery, and single well control area. Wherein the recovery factor is the ratio of the amount of produced oil and gas to the original geological reserve of the gas reservoir, and can be expressed by percentage. When a gas reservoir is developed, the recovery ratio can be determined in advance according to methods such as a core analysis method, a hydrodynamic profile algorithm, a reservoir numerical simulation method, a related empirical formula method, a development dynamic method and the like.
In some embodiments, the physical property parameter may include a parameter indicative of a physical property of the gas formation, such as formation pressure, abundance of reserves, formation temperature, permeability, gas formation thickness, viscosity, and the like.
In some embodiments, the server may obtain the economic parameter and the physical parameter in any manner. For example, the user may directly transmit the economic parameter and the physical property parameter to the server, and the server may receive the economic parameter and the physical property parameter; in another example, in the embodiment of the present specification, a method for obtaining the economic parameter and the physical property parameter by the server is not limited, and the economic parameter and the physical property parameter may be obtained by the server through another electronic device other than the server.
S120: and judging whether each gas layer is a combined gas layer suitable for multi-layer combined production according to the economic parameters and the physical parameters.
In some embodiments, the rational exploitation of tight gas reservoir wells may include multi-layer commingling and single production. When the reasonable development mode of the tight gas reservoir gas well is determined to be multilayer joint production or single production, not only the development difficulty and the gas recovery rate but also the development cost and the profit are considered, generally speaking, the higher the development difficulty is, the higher the required cost is, the higher the gas recovery rate is and the higher the profit is. In the embodiment of the specification, the development difficulty and the gas recovery rate can be converted into the angle of income and cost, so that the reasonable development mode of the tight gas reservoir gas well can be determined. Specifically, the step of judging whether each gas layer is suitable for multi-layer combined mining according to the economic parameter and the physical parameter may include the following steps.
S121: and estimating the predicted benefit of each gas layer according to the economic parameters and the physical parameters.
In some embodiments, the gas production capacity of each gas layer may be calculated first, and the expected benefit of each gas layer may be estimated based on the gas production capacity. Specifically, the gas recovery rate of each gas layer can be calculated according to the following formula:
Q＝ER×Ig×Sg(1)
wherein Q represents the gas-producing capacity, ERExpressed in recovery ratio, IgIndicating abundant reserves, SgRepresenting a single well control area.
In some embodiments, for each gas layer, the benefit of that gas layer may be determined from the recoverable amount of that gas layer:
S＝Q×P (2)
where S represents the expected yield and P represents the gas unit price.
S122: and taking the gas layer with the predicted income smaller than the preset threshold value as a combined gas layer suitable for multi-layer combined production.
In some embodiments, the predicted returns of each gas layer may be compared to a preset threshold for each gas layer, if the predicted returns are less than the preset threshold, it is indicated that single-production is not economically valuable, and the gas layer may be determined to be a commingled gas layer suitable for multi-layer commingled production; if the predicted income is greater than or equal to the preset threshold value, the economic value of single mining is indicated, and the method is suitable for single mining.
In some embodiments, the preset threshold is used to determine whether the expected yield of each gas layer reaches a desired value, and if the expected yield of the gas layer reaches the desired value, the gas layer may be indicated as suitable for single-production, otherwise, the gas layer is indicated as a co-production gas layer suitable for multi-layer co-production. The preset threshold value of each gas layer can be determined according to the exploitation cost of each gas layer. Specifically, the production cost of each gas formation may be determined according to the following formula:
C＝F1+F2×n+V1×10-5×Q (3)
wherein C represents the mining cost, F1Indicating the cost of directional drilling, F2Representing fixed operating costs, n representing the age of production, V1Representing variable operating costs.
In some embodiments, the production cost of each gas formation may be used as a preset threshold for each gas formation. Of course, a value around the mining cost may be used as the preset threshold. For example, the mining cost of a certain gas formation is a, the value a may be used as a preset threshold, or a value near the value a may be used as a preset threshold, that is, a value in the interval [ a-b, a + b ] is used as a preset threshold.
S130: and when the combined gas production layer is judged to be suitable for multi-layer combined production, the production allocation range of each gas layer in the combined gas production layer is given based on the physical property parameters.
In some embodiments, the number of commingled gas layers suitable for multi-layer commingling comprises at least two. After the commingled gas production zone is determined, the production allocation range of each gas zone is also determined in order to guide the exploitation of the gas well. The reasonable production allocation range can ensure that the production is stable, the casing pressure and the instantaneous flow are kept unchanged or in a slow descending trend, and the pressure drop rate and the yield reduction rate are maintained in the standard value range in the gas well exploitation process. Unreasonable production allocation will affect the production cycle and recovery ratio of the gas well, too large production allocation will result in too large pressure drop rate and destructive exploitation in the production process, the production cycle of the gas well is shortened, too small production allocation will be adverse to the gas well to carry liquid, liquid accumulation phenomenon will occur in the production process, and the casing pressure will rise continuously and the instantaneous flow will drop.
In some embodiments, the method for determining the production allocation range of each gas zone in the commingled gas zone based on the unimpeded flow rate production allocation may specifically include the following steps.
S131: and calculating the unimpeded flow of each gas layer in the combined gas production layer according to the physical parameters.
In some embodiments, the unobstructed flow rate is a gas yield obtained by a blowout method of an open wellhead when the gas well capacity is measured, that is, the gas yield when the wellhead has no back pressure. Specifically, the unobstructed flow of each gas layer in the combined gas production layer can be obtained according to the following formula:
wherein Q isAOFTo representUnimpeded flow, A represents laminar flow coefficient, B represents turbulent flow coefficient, prRepresenting the original formation pressure.
In some embodiments, the laminar flow coefficient a and the turbulent flow coefficient B may be calculated according to the following formulas:
wherein T represents the formation temperature and Z represents prGas deviation factor under T condition, K represents permeability, h represents gas layer thickness, mugDenotes the gas viscosity, reDenotes the gas layer discharge radius, rwIndicating the wellbore radius, S the skin factor, β the turbulence factor.
S132: and giving the production allocation range of each gas layer in the combined gas production layer according to the unimpeded flow.
In some embodiments, reasonable production allocation is achieved by using 1/6-1/3 unimpeded flow, so that the production allocation range of each gas layer in the combined gas production layer can be given as 1/6QAOF-1/3QAOF。
S140: and determining the bottom hole flow pressure when the combined production gas layer is subjected to multi-layer combined production according to the production allocation range.
In some embodiments, the bottom hole flowing pressure is also called flowing pressure or flowing pressure, and is the bottom hole pressure when an oil or gas well is produced. It represents the pressure remaining after the oil and gas flow from the formation to the bottom of the well, and for a flowing well, the pressure at the beginning of the flow of oil and gas from the bottom of the well to the surface. The gas well bottom flowing pressure is one of important parameters for analyzing the gas well production dynamics, and when the bottom flowing pressure is higher than the saturated pressure, the gas well flowing pressure is reduced, and the yield is increased linearly; when the bottom hole flowing pressure is lower than the saturation pressure and is further reduced, the yield rising speed is slowed down; when the pressure drop is reduced to a certain extent, the production yield is reduced along with the increase of the production pressure difference. Therefore, maintaining a reasonable bottom hole flow pressure is important to maintaining high production from gas wells.
In some embodiments, a bottom hole flow pressure at which multi-layer commingling of the commingled production gas formation may be determined based on the production allocation range. Specifically, the following steps may be included.
S141: and calculating the bottom hole flowing pressure range of each gas layer in the combined production gas layer according to the production allocation range.
In some embodiments, the production of a gas well is controlled by both a gas formation flow pressure system and a wellbore flow pressure system, which need to be studied in order to evaluate the feasibility of gas well multi-well commingling and predict its production. The gas layer flow pressure system can be expressed by a binomial productivity equation:
pr 2-pwf 2＝Aqsc+Bqsc 2(8)
wherein p isrRepresenting the original formation pressure, pwfRepresenting the bottom hole flow pressure, qscIndicating the volumetric flow at standard pressure.
From equation (8) it follows:
in some embodiments, since the non-choke flow rate is the volume flow rate when the wellhead has no back pressure, the bottom hole flow pressure range of each gas layer in the commingled production gas layer can be determined by substituting the production allocation range into equation (9):
wherein p iswfmaxRepresenting the maximum value of the bottom hole flow pressure, pwfminIndicating the minimum value of the bottom hole flowing pressure, bottom hole of each gas layerA flow pressure range of [ p ]wfmax,pwfmin]。
S142: and converting the bottom hole flowing pressure range into the bottom hole flowing pressure range of the uppermost layer in the combined gas production zone to obtain the equivalent converted pressure range of each gas zone.
In some embodiments, the bottom hole flow pressure may be converted to the topside pressure according to the following formula:
pwf′＝pwf-pgh (12)
wherein p iswf' denotes equivalent reduced pressure, ρ denotes density, and h denotes gas layer thickness.
The equivalent reduced pressure range may be determined by substituting the bottom hole flow pressure range into equation (12):
pwfmax′＝pwfmax-pgh (13)
pwfmin′＝pwfmin-pgh (14)
wherein p iswfmax' means equivalent reduced pressure maximum, pwfmin' represents the minimum equivalent reduced pressure, and the equivalent reduced pressure range of each gas layer is [ p ]wfmax’,pwfmin’]。
S143: and judging whether the equivalent converted pressure ranges of the gas layers have intersection.
S144: and under the condition that the intersection exists, selecting the bottom hole flowing pressure when the multi-layer commingled production is carried out on the commingled production gas layer from the intersection.
In some embodiments, if the intersection of the equivalent reduced pressure ranges of the gas formations is not equal to zero, the bottom-hole pressure may be selected from the intersection as the bottom-hole flow pressure at the multi-formation commingling. Of course, one of the subsets may be selected from the intersection as the bottom hole flow pressure range in the multi-layer commingling production.
In some embodiments, if there is no intersection between the equivalent reduced pressure ranges of the gas formations, the bottom hole flow pressure for multi-layer commingled production of the commingled gas formation may be determined according to the following steps.
S145: and acquiring the weight coefficient of each gas layer in the combined gas production layer based on the ratio of the unimpeded flow of each gas layer in the combined gas production layer to the total unimpeded flow of the combined gas production layer.
Specifically, the weight coefficient of each gas layer in the gas layers suitable for multi-layer commingled production can be determined according to the following formula:
wherein x isiRepresents the weight coefficient, Q, of the ith gas layerAOF(i)The flow rate of the ith gas layer is shown, i is 1,2 … n.
S146: and obtaining the bottom hole flow pressure when the multi-layer commingled production is carried out on the commingled production gas layer according to the weight coefficient and the equivalent converted pressure range.
In some embodiments, an average of the equivalent reduced pressures may be calculated from the equivalent reduced pressure range:
wherein p iswfi' represents an average value of equivalent reduced pressure of the ith gas layer, [ p ]wifmax’,pwfimin’]Representing the equivalent reduced pressure range for the ith gas layer.
In some embodiments, the bottom hole flow pressure when the multi-layer commingling of the commingled production gas layer is performed can be obtained according to the average value of the equivalent converted pressure and the weight coefficient. Specifically, the bottom hole flow pressure when the multi-layer commingled production is performed on the commingled production gas layer can be obtained according to the following formula:
wherein p iswfAnd the bottom hole flowing pressure when the commingled gas layer is subjected to multi-layer commingled production is shown.
The method for determining the exploitation mode of the tight gas reservoir gas well provided by the embodiment of the specification can be used for acquiring economic parameters of the tight gas reservoir gas well and physical parameters of each gas layer; judging whether each gas layer is a combined gas layer suitable for multi-layer combined production according to the economic parameters and the physical parameters; under the condition that the combined gas production layer is judged to be suitable for multi-layer combined production, the production allocation range of each gas layer in the combined gas production layer is given based on the physical property parameters; and determining the bottom hole flow pressure when the combined production gas layer is subjected to multi-layer combined production according to the production allocation range. The method for determining the gas well exploitation mode of the compact gas reservoir provided by the embodiment of the specification considers the influence of physical property parameters of each gas layer on multi-layer commingled exploitation, particularly the original pressure of the stratum, calculates the reasonable production allocation range and the reasonable bottom-hole flow pressure range of each gas layer, establishes a model for judging whether each gas layer can carry out multi-layer commingled exploitation, is simple in calculation, strong in operability, comprehensive in consideration and high in accuracy, can determine the bottom-hole flow pressure under the condition of multi-layer commingled exploitation, and lays a foundation for the actual development of an oil field.
A specific embodiment of the method for determining the production mode of the tight gas reservoir gas well provided by the embodiment of the present disclosure is described below with reference to fig. 2 and 3.
In the embodiments of the present specification, the method of determining the production pattern of the well X-1 is taken as an example. A suitable perforation horizon for well X-1 may include three layers 1,2, and 3 having physical property parameters related as shown in fig. 2, where the subscripts 1,2, and 3 for each parameter represent the corresponding physical property parameters for the first, second, and third layers, respectively. The positional relationship of the three layers is shown in fig. 3.
In the examples of this specification, physical and economic parameters of each gas formation in well X-1 are obtained as shown in tables 1 and 2.
TABLE 1
TABLE 2
In the embodiment of the specification, the gas recovery rate, the predicted profit and the mining cost of each gas layer can be respectively determined according to the formulas (1) to (3), and whether each gas layer is suitable for multi-layer joint mining can be judged.
Specifically, for layer 1, the gas producible amount Q1＝0.04704×108Square, expected profit S1757.8 ten thousand yuan, mining cost C11350 ten thousand yuan, the mining cost C can be reduced1As the preset threshold for layer 1, S can be derived1＜C1Therefore layer 1 is not suitable for single mining; for layer 2, the gas producible quantity Q2＝0.04368×108Square, expected profit S2703.2 ten thousand yuan, mining cost C21350 ten thousand yuan, the mining cost C can be reduced2As a preset threshold for layer 2, S can be derived2＜C2Therefore layer 2 is not suitable for single mining; for the 3 rd layer gas production quantity Q3＝0.0806×108Square, expected profit S31298.3 ten thousand yuan, mining cost C31350 ten thousand yuan, the mining cost C can be reduced3As a preset threshold for layer 3, S can be derived3＜C3And thus layer 3 is not suitable for apheresis.
In the embodiment of the specification, since the three layers 1,2 and 3 are not suitable for single mining, the three layers 1,2 and 3 can be developed by multi-layer co-mining.
In the embodiments of the present specification, the turbulence coefficient and the laminar flow coefficient of each gas layer may be determined according to equations (5) to (7). Specifically, for layer 1, the laminar flow coefficient A19.7, coefficient of turbulence B10.62; for layer 2, the laminar flow coefficient A264.186, constant flow coefficient B28.334; for layer 3, the laminar flow coefficient A348.04, coefficient of turbulence B3＝4.31。
Further, the unobstructed flow rate of each gas layer may be determined according to equation (4). Specifically, the layer 1 unimpeded flow rate QAOF(1)4.5 ten thousand square, layer 2 unobstructed flow QAOF(2)2.15 ten thousand square, no-resistance flow rate Q of layer 3AOF(3)5.97 ten thousand squares.
In the embodiment of the specification, the production allocation range of each gas layer can be determined according to 1/6 no-1/3 no-resistance flowThe circumference is that the production range of the 1 st layer is 0.75-1.5 × 104m3The production range of the 2 nd layer is 0.36-0.72 × 104m3The production range of the layer 1 is 0.99-1.99 × 104m3。
In the embodiment of the present specification, the bottom hole flow pressure range of each gas zone in the combined production gas zone can be obtained by substituting the production allocation range of each gas zone into the formulas (10) and (11). Specifically, it can be found that the bottom hole flowing pressure range of the layer 1 is 6.35-7.4 MPa; the bottom hole flowing pressure range of the layer 2 is 11.29-12.35 MPa; the bottom hole flowing pressure of the layer 3 is 18.11-19.72 MPa.
In the embodiment of the specification, the bottom-hole flowing pressure range of each gas layer can be converted into the bottom-hole flowing pressure range of the uppermost layer, and the equivalent converted pressure range of each gas layer is obtained. As can be seen from fig. 2, the uppermost layer is layer 1, and thus the bottom hole flow pressure ranges of layers 2 and 3 can be converted into the bottom hole flow pressure range of layer 1 according to formula (13) and formula (14). Specifically, it can be found that the equivalent reduced pressure range of the 2 nd layer is 11.09-12.5 MPa; the equivalent reduced pressure range of the layer 3 is 17.81-19.42 MPa.
In the embodiment of the present specification, the bottom hole flowing pressure range of the 1 st layer, the equivalent reduced pressure range of the 2 nd layer and the equivalent reduced pressure range of the 3 rd layer obtained by the above calculation can be obtained, and the intersection of the three ranges is zero. Therefore, the weight coefficient of each gas layer can be determined according to the formula (15). Specifically, it can be found that the weight coefficient of the layer 1 is 0.375; the weight coefficient of layer 2 is 0.17; the weight coefficient of layer 3 is 0.473.
In the embodiments of the present description, the average value of the equivalent reduced pressure of each gas layer may also be determined according to equation (16). Specifically, it can be found that the average value of the bottom hole flowing pressure of the layer 1 is 6.88 MPa; the average equivalent reduced pressure of the 2 nd layer is 11.62 MPa; the equivalent reduced pressure of layer 3 averaged 18.61 MPa.
In the embodiment of the present specification, after the weight coefficient and the equivalent converted pressure average value of each gas layer are calculated, the bottom hole flow pressure when the multi-layer commingled production is performed on the three layers 1,2 and 3 can be determined according to the formula (17). Specifically, when 1,2 and 3 layers of combined production are carried out, the bottom hole flowing pressure can be selected to be 13.24 MPa.
Referring to fig. 4, the present specification further provides a device for determining a production mode of a tight gas reservoir gas well, and the device may specifically include the following structural modules.
The acquisition module 410 is used for acquiring economic parameters of a tight gas reservoir gas well and physical parameters of each gas layer;
the judging module 420 is used for judging whether each gas layer is a combined gas layer suitable for multi-layer combined production according to the economic parameters and the physical parameters;
a giving module 430, configured to, in a case where the combined gas production layer is determined to be suitable for multi-layer combined production, give a production allocation range of each gas layer in the combined gas production layer based on the physical property parameters;
and the determining module 440 is configured to determine a bottom hole flow pressure when performing multi-layer commingled production on the commingled production gas layer according to the production allocation range.
In some embodiments, the determining module 420 may include: the estimation unit is used for estimating the predicted income of each gas layer according to the economic parameters and the physical parameters; and the judging unit is used for taking the gas layer with the estimated income smaller than the preset threshold value as a combined gas production layer suitable for multi-layer combined production.
In some embodiments, the given module may include 430: the calculating unit is used for calculating the unimpeded flow of each gas layer in the combined gas production layer according to the physical property parameters; and the giving unit is used for giving the production allocation range of each gas layer in the combined gas production layer according to the unimpeded flow.
In some embodiments, the determining module 440 may include: the calculation unit is used for calculating the bottom hole flowing pressure range of each gas layer in the combined gas production layer according to the production allocation range; the conversion unit is used for converting the bottom-hole flowing pressure range into the bottom-hole flowing pressure range of the uppermost layer in the combined gas production layer to obtain the equivalent conversion pressure range of each gas layer; the judging unit is used for judging whether the equivalent conversion pressure ranges of the gas layers have intersection or not; and the selecting unit is used for selecting the bottom hole flow pressure when the commingled gas production layer is subjected to multi-layer commingled production from the intersection under the condition that the intersection is judged to exist.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and the same or similar parts in each embodiment may be referred to each other, and each embodiment focuses on differences from other embodiments. In particular, as for the apparatus embodiment and the apparatus embodiment, since they are substantially similar to the method embodiment, the description is relatively simple, and reference may be made to some descriptions of the method embodiment for relevant points.
After reading this specification, persons skilled in the art will appreciate that any combination of some or all of the embodiments set forth herein, without inventive faculty, is within the scope of the disclosure and protection of this specification.
In the 90 th generation of 20 th century, it is obvious that improvements in Hardware (for example, improvements in Circuit structures such as diodes, transistors and switches) or software (for improvement in method flow) can be distinguished for a technical improvement, however, as technology develops, many of the improvements in method flow today can be regarded as direct improvements in Hardware Circuit structures, designers almost all obtain corresponding Hardware Circuit structures by Programming the improved method flow into Hardware circuits, and therefore, it cannot be said that an improvement in method flow cannot be realized by Hardware entity modules, for example, Programmable logic devices (Programmable logic devices L organic devices, P L D) (for example, Field Programmable Gate Arrays (FPGAs) are integrated circuits whose logic functions are determined by user Programming of devices), and a digital system is "integrated" on a P L D "by self Programming of designers without requiring many kinds of integrated circuits manufactured and manufactured by special chip manufacturers to design and manufacture, and only a Hardware program is written by Hardware logic editor (software) such as Hardware editor software, software editor, software, Hardware editor, software, Hardware, software, Hardware, software, Hardware, software, Hardware, software, Hardware, software, Hardware, software, Hardware, software, Hardware, software, Hardware, software, Hardware, software, Hardware, software.
The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. One typical implementation device is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smartphone, 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.
From the above description of the embodiments, it is clear to those skilled in the art that the present specification can be implemented by software plus a necessary general hardware platform. Based on such understanding, the technical solutions of the present specification may be essentially or partially implemented in the form of software products, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and include instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments of the present specification.
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 description is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
This description 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 specification 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.
While the specification has been described with examples, those skilled in the art will appreciate that there are numerous variations and permutations of the specification that do not depart from the spirit of the specification, and it is intended that the appended claims include such variations and modifications that do not depart from the spirit of the specification.
Claims (10)
1. A method for determining the exploitation mode of a tight gas reservoir gas well is characterized by comprising the following steps:
obtaining economic parameters of a compact gas reservoir gas well and physical parameters of each gas layer;
judging whether each gas layer is a combined gas layer suitable for multi-layer combined production according to the economic parameters and the physical parameters;
under the condition that the combined gas production layer is judged to be suitable for multi-layer combined production, the production allocation range of each gas layer in the combined gas production layer is given based on the physical property parameters;
and determining the bottom hole flow pressure when the combined production gas layer is subjected to multi-layer combined production according to the production allocation range.
2. The method of claim 1, wherein the determining whether each gas layer is a commingled gas layer suitable for multi-layer commingled production according to the economic parameter and the physical parameter comprises:
estimating the predicted income of each gas layer according to the economic parameters and the physical parameters;
and taking the gas layer with the predicted income smaller than the preset threshold value as a combined gas layer suitable for multi-layer combined production.
3. The method of claim 1, wherein the number of commingled gas layers suitable for multi-layer commingling comprises at least two.
4. The method of claim 1, wherein the given production window for each of the commingled gas production zones based on the physical parameters comprises:
obtaining the unimpeded flow of each gas layer in the combined gas production layer according to the physical property parameters;
and giving the production allocation range of each gas layer in the combined gas production layer according to the unimpeded flow.
5. The method of claim 1, wherein determining a bottom hole flow pressure for multi-layer commingling of the commingled production gas formation from the production reserve comprises:
calculating the bottom hole flowing pressure range of each gas layer in the combined production gas layer according to the production allocation range;
converting the bottom hole flowing pressure range into the bottom hole flowing pressure range of the uppermost layer in the combined gas production layer to obtain the equivalent converted pressure range of each gas layer;
judging whether the equivalent conversion pressure ranges of the gas layers have intersection or not;
and under the condition that the intersection exists, selecting the bottom hole flowing pressure when the multi-layer commingled production is carried out on the commingled production gas layer from the intersection.
6. The method of claim 5, wherein determining a bottom hole flow pressure for multi-layer commingling of the commingled production gas formation from the production reserve comprises:
under the condition that intersection does not exist, acquiring the weight coefficient of each gas layer in the commingled gas production layer based on the ratio of the unimpeded flow of each gas layer in the commingled gas production layer to the total unimpeded flow of the commingled gas production layer;
and obtaining the bottom hole flow pressure when the multi-layer commingled production is carried out on the commingled production gas layer according to the weight coefficient and the equivalent converted pressure range.
7. An apparatus for determining a tight gas reservoir well recovery pattern, the apparatus comprising:
the acquisition module is used for acquiring economic parameters of the compact gas reservoir gas well and physical parameters of each gas layer;
the judgment module is used for judging whether each gas layer is a combined gas layer suitable for multi-layer combined production according to the economic parameters and the physical parameters;
the giving module is used for giving the production allocation range of each gas layer in the combined gas production layer based on the physical property parameters under the condition that the combined gas production layer suitable for multi-layer combined production is judged;
and the determining module is used for determining the bottom hole flow pressure when the multi-layer commingled production is carried out on the commingled production gas layer according to the production allocation range.
8. The apparatus of claim 7, wherein the determining module comprises:
the estimation unit is used for estimating the predicted income of each gas layer according to the economic parameters and the physical parameters;
and the judging unit is used for taking the gas layer with the estimated income smaller than the preset threshold value as a combined gas production layer suitable for multi-layer combined production.
9. The apparatus of claim 7, wherein the given module comprises:
the calculating unit is used for calculating the unimpeded flow of each gas layer in the combined gas production layer according to the physical property parameters;
and the giving unit is used for giving the production allocation range of each gas layer in the combined gas production layer according to the unimpeded flow.
10. The apparatus of claim 7, wherein the determining module comprises:
the calculation unit is used for calculating the bottom hole flowing pressure range of each gas layer in the combined gas production layer according to the production allocation range;
the conversion unit is used for converting the bottom-hole flowing pressure range into the bottom-hole flowing pressure range of the uppermost layer in the combined gas production layer to obtain the equivalent conversion pressure range of each gas layer;
the judging unit is used for judging whether the equivalent conversion pressure ranges of the gas layers have intersection or not;
and the selecting unit is used for selecting the bottom hole flow pressure when the commingled gas production layer is subjected to multi-layer commingled production from the intersection under the condition that the intersection is judged to exist.
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