CN114293961A - Offshore fracturing stratum-selecting and section-selecting method and device, electronic equipment and storage medium - Google Patents
Offshore fracturing stratum-selecting and section-selecting method and device, electronic equipment and storage medium Download PDFInfo
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Abstract
The embodiment of the invention discloses a method and a device for offshore fracturing layer selection and section selection, electronic equipment and a storage medium. The method comprises the following steps: establishing a relational expression of productivity and the geological static parameters according to geological static parameters influencing offshore fracturing, development well development dynamics and formation pressure coefficients; determining a lower limit value of a sensitive parameter influencing the yield after fracturing according to a relational expression of the productivity and the geological static parameter and through a yield threshold value after offshore fracturing; wherein the sensitive parameters comprise permeability, porosity, gas saturation, formation coefficient KH and maximum communicating pore throat radius; and determining the corresponding lower limit value of the well control reserve according to the recovery ratio of the gas reservoir with different permeability and the lower limit value of the accumulative yield of the development well with different permeability. By the technical scheme of the embodiment of the invention, whether the offshore pre-fractured hypotonic-extra-hypotonic gas well is economical and effective or not can be quickly judged, and a decision basis is provided for a manager.
Description
Technical Field
The embodiment of the invention relates to the technical field of unconventional oil and gas yield increase transformation, in particular to a method and a device for selecting sections of an offshore fracturing layer, electronic equipment and a storage medium.
Background
Offshore fracturing costs are high, and if the pre-fracturing interval selection has no suitable standard, the input and output loss caused by the method is far greater than that of onshore low-permeability hydrocarbon reservoirs. Meanwhile, offshore drilling cost is high, the number of wells is less than that of the wells on land, available sample points are few, and conditions for establishing a layer selection and section selection standard by big data statistics are not provided. The existing method is a layer selection and section selection method or an effect judgment method aiming at staged fracturing of onshore shale gas and low-permeability gas reservoir horizontal wells, the covered conditions are limited, the existing method is not systematic, and different conditions of exploration evaluation purposes of exploratory wells and economic and effective development wells are not considered; the onshore fracturing cost is low, and the standard of selecting layers and selecting sections is not suitable for offshore movement with higher fracturing cost. Therefore, how to perform offshore fracturing and interval selection is a technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The embodiment of the invention provides a method and a device for offshore fracturing layer selection and section selection, electronic equipment and a storage medium, which can be used for rapidly judging whether an offshore pre-fractured hypotonic-extra-hypotonic gas well is economical and effective or not and providing decision basis for managers.
In a first aspect, an embodiment of the present invention provides a method for selecting a section of an offshore fracturing layer, including:
establishing a relational expression of productivity and the geological static parameters according to geological static parameters influencing offshore fracturing, development well development dynamics and formation pressure coefficients;
determining a lower limit value of a sensitive parameter influencing the yield after fracturing according to a relational expression of the productivity and the geological static parameter and through a yield threshold value after offshore fracturing; wherein the sensitive parameters comprise permeability, porosity, gas saturation, formation coefficient KH and maximum communicating pore throat radius;
and determining the corresponding lower limit value of the well control reserve according to the recovery ratio of the gas reservoir with different permeability and the lower limit value of the accumulative yield of the development well with different permeability.
In a second aspect, an embodiment of the present invention further provides an offshore fracturing selecting and staging device, including:
the relational expression establishing module is used for establishing a relational expression between productivity and the geological static parameters according to the geological static parameters influencing offshore fracturing, development well development dynamics and formation pressure coefficients;
the sensitive parameter lower limit value determining module is used for determining the lower limit value of the sensitive parameter influencing the yield after fracturing through the yield threshold value after offshore fracturing according to the relational expression of the productivity and the geological static parameter; wherein the sensitive parameters comprise permeability, porosity, gas saturation, formation coefficient KH and maximum communicating pore throat radius;
and the well control reserve lower limit value determining module is used for determining the corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoir with different permeability and the lower limit value of the accumulative production of the development well with different permeability.
In a third aspect, an embodiment of the present invention further provides an electronic device, where the electronic device includes:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method of offshore fracture staging according to any embodiment of the invention.
In a fourth aspect, the embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the program, when executed by a processor, implements the method for selecting a section of an offshore fracturing zone according to any of the embodiments of the present invention.
The embodiment of the invention provides a method, a device, electronic equipment and a storage medium for offshore fracturing layer selection and section selection, wherein a relational expression of productivity and geological static parameters is established according to geological static parameters, development well development dynamics and formation pressure coefficients which affect offshore fracturing; determining a lower limit value of a sensitive parameter influencing the yield after fracturing according to a relational expression of the productivity and the geological static parameter and through a yield threshold value after offshore fracturing; wherein the sensitive parameters comprise permeability, porosity, gas saturation, formation coefficient KH and maximum communicating pore throat radius; and determining the corresponding lower limit value of the well control reserve according to the recovery ratio of the gas reservoir with different permeability and the lower limit value of the accumulative yield of the development well with different permeability. According to the technical scheme of the embodiment of the invention, geological static parameters, engineering parameters and economic parameters which affect the fracturing effect are considered at the same time, and the lower limit values of sensitive parameters under different permeability, different well types and different development states are given out in a classified manner, so that whether the marine pre-fractured hypotonic-extra-hypotonic gas well is economic and effective or not is judged quickly, and a decision basis is provided for a manager.
Drawings
FIG. 1 is a flow chart of a method for selecting a section of an offshore fracturing zone according to an embodiment of the present invention;
FIG. 2A is a flow chart of a method for selecting a section of an offshore fracturing zone according to a second embodiment of the present invention;
FIG. 2B is a graph of gas saturation versus permeability according to a second embodiment of the present invention;
FIG. 2C is a graph of water saturation versus permeability according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a marine fracturing stratum-selecting section-selecting device according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations (or steps) can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Offshore fracturing costs are high, and if the pre-fracturing interval selection has no suitable standard, the input and output loss caused by the method is far greater than that of onshore low-permeability hydrocarbon reservoirs. In the prior art, the main process method is to obtain basic data of an oil-gas well, including gas content data of a reservoir, mineral and rock mechanics data of the reservoir, well data, fracturing construction data of a fractured well, production data after fracturing and the like, screen sensitive parameters related to the yield after fracturing according to the fracturing effect, apply carding statistics and fuzzy mathematical theories, quantify the weight of each parameter influencing the fracturing effect, calculate to obtain a comprehensive parameter, establish the relation with the yield or the unimpeded flow after fracturing, obtain a comprehensive parameter threshold value corresponding to the effective yield, and realize the advanced quantitative prediction of the effect of a fractured well section. However, the prior art is directed to fracturing of onshore shale gas or low permeability gas reservoirs under specific conditions, such as secondary fracturing or horizontal interval fracturing. The coverage is limited and the system is not sufficient. Firstly, onshore fracturing is low in cost, and the standard of selecting layers and sections is not suitable for offshore operations with higher fracturing cost. Secondly, the exploration evaluation purpose of the exploratory well and the different situations of economic effectiveness of the development well are not considered. The sensitive parameters and the threshold values are determined mainly by mathematical statistics, and the selected parameters have original measured data and processed parameters at random, so that the reason why the parameters are the parameters is not explained from the mechanism perspective, and the parameters are not applicable to other regions. And limited by the number and representativeness of the sample points, the statistical results may deviate from the intrinsic parameter relationship in the case of few offshore fracturing wells. The parameter weight values are obtained according to mathematical statistics, new evaluation parameters are reconstructed, inherent reasons that parameters such as gas saturation and the like have different influences on fracturing effects under different conditions of hypotonic-ultra-hypotonic are probably covered, and the results are influenced by multiple parameter influence factors under different conditions due to the fact that only quantitative calculation is carried out and a comprehensive analysis method is lacked. Therefore, the embodiment of the invention provides a method for selecting a layer and a section by offshore fracturing, which can be used for quickly judging whether an offshore pre-fractured hypotonic-extra-hypotonic gas well is economic and effective or not and providing decision basis for managers.
Example one
Fig. 1 is a flowchart of a method for offshore fracturing and interval selecting, which is provided in an embodiment of the present invention, and the embodiment is applicable to a case of fracturing and interval selecting for an offshore hypotonic-ultra-hypotonic gas reservoir. The device can be configured in a server of the offshore fracturing selection section. The method specifically comprises the following steps:
s110, establishing a relational expression of productivity and the geological static parameters according to geological static parameters influencing offshore fracturing, development well development dynamics and formation pressure coefficients.
Wherein, the geostatic parameters may refer to parameters reflecting geological performance, such as, but not limited to, reservoir performance of the reservoir, flow performance of the reservoir, reformation performance of the reservoir, and economic parameters; reservoir performance parameters of a reservoir are the material basis for stimulation, including but not limited to porosity, gas saturation, and effective thickness parameters characterizing gas reservoir single reserve coefficients and reserve abundances; the flow performance-seepage parameter of the reservoir reflects seepage supply capacity, is a production basis for increasing production after fracturing, and comprises but is not limited to parameters such as matrix permeability, pore throat radius, formation pressure and the like; the transformation performance parameters of the reservoir are rock compressibility and other parameters, including but not limited to stress difference of the reservoir layer, Young modulus, Poisson's ratio, cementing quality and other parameters. The economic parameters mainly comprise input-output ratio, namely investment cost, gas accumulation rate, gas price and other factors, and under the condition that the gas price fluctuation is not large, the main influencing factors are the gas accumulation rate and the residual geological reserves.
Development well development dynamics may refer to the current development state of a development well, including, for example, but not limited to, fracturing on an old well that has been completed, preparing to fracture the well, and planning to build a new production platform; wherein the development wells comprise directional wells and horizontal wells.
The formation pressure coefficient may refer to the ratio of the formation pressure to the hydrostatic column pressure, which is a primary parameter used to determine whether the formation pressure is abnormal. For example, a formation pressure equal to 1 is a normal formation pressure; when the formation pressure is greater than 1, the formation pressure is called high abnormal formation pressure or high pressure abnormal; when the formation pressure is less than 1, it is called low abnormal formation pressure, or low pressure abnormal. Where formation pressure refers to the pressure acting on fluids (e.g., oil, gas, and water) within the rock pore space, hydrostatic pressure is the pressure caused by the weight of the fluid column.
The relational expression of the productivity and the geological static parameters can be established according to the logging data, the analysis and test data, the test and production data, the fracturing construction parameters and the related research results of the conventional fracturing well.
And S120, determining a lower limit value of a sensitive parameter influencing the yield after fracturing according to the relational expression of the productivity and the geological static parameter and the yield threshold value after offshore fracturing.
The sensitive parameters may be parameters most sensitive to the yield after offshore fracturing, for example, permeability and water saturation are determined to be parameters most sensitive to the yield after offshore fracturing by counting the relationship between the yield after fractured wells and the storage performance of the reservoir and the flow performance parameters of the reservoir and combining the mechanism research results. Wherein the sensitive parameters comprise permeability, porosity, gas saturation, formation coefficient KH and maximum communicating pore throat radius.
S130, determining a corresponding lower limit value of well control reserve according to the recovery ratio of the gas reservoir with different permeability and the lower limit value of the accumulative production of the development well with different permeability.
Wherein, the recovery ratio can be the ratio of the final gas production of the gas reservoir to the oil-gas geological reserve, and is one for measuring the development level of the gas reservoirAn important index. In an alternative embodiment of the invention, the gas reservoir recovery factor is different for different permeabilities, the higher the permeability within a predetermined range the higher the gas reservoir recovery factor, e.g. permeability between 0 and 1 x 10-3μm2Within the interval, the permeability is 35-40%; permeability of 1-10 x 10-3μm2Within the interval, the permeability is 40% -50%.
The well control reserves can refer to the reserves of crude oil in the reservoir at the initial moment, and the quality of the reservoir can be effectively evaluated through the well control reserves, so that the exploration and development process can be conveniently carried out.
The embodiment of the invention provides a method for selecting a stratum and a section by offshore fracturing, which is characterized in that a relational expression of productivity and geological static parameters is established according to geological static parameters influencing offshore fracturing, development dynamic of a development well and formation pressure coefficients; determining a lower limit value of a sensitive parameter influencing the yield after fracturing according to a relational expression of the productivity and the geological static parameter and through a yield threshold value after offshore fracturing; wherein the sensitive parameters comprise permeability, porosity, gas saturation, formation coefficient KH and maximum communicating pore throat radius; and determining the corresponding lower limit value of the well control reserve according to the recovery ratio of the gas reservoir with different permeability and the lower limit value of the accumulative yield of the development well with different permeability. According to the technical scheme of the embodiment of the invention, geological static parameters, engineering parameters and economic parameters which affect the fracturing effect are considered at the same time, and the lower limit values of sensitive parameters under different permeability, different well types and different development states are given out in a classified manner, so that whether the marine pre-fractured hypotonic-extra-hypotonic gas well is economic and effective or not is judged quickly, and a decision basis is provided for a manager.
Example two
Fig. 2A is a flowchart of a method for selecting a section of an offshore fracturing layer according to a second embodiment of the present invention. Embodiments of the present invention are further optimized on the basis of the above-mentioned embodiments, and the embodiments of the present invention may be combined with various alternatives in one or more of the above-mentioned embodiments. As shown in fig. 2A, the offshore fracturing interval selection method provided in the embodiment of the present invention may include the following steps:
s210, establishing a relational expression of productivity and the geological static parameters according to the geological static parameters affecting the offshore fracturing, the development dynamic of the development well and the formation pressure coefficient.
The high cost of offshore fracturing determines the formation that must be properly fractured from an input-to-output ratio perspective, and the key factors in determining whether a formation is properly fractured are: firstly, the stratum can be successfully fractured, secondly, better productivity is obtained after the fracturing, and finally, economic benefits are obtained under the condition of certain investment cost. The main factors for determining whether the stratum can be successfully fractured from the aspect of well selection and stratum selection are whether the stratum has fracturing conditions and whether the stratum has engineering parameters with compressibility; obtaining better productivity and accumulated yield after the pressure is determined, wherein the better productivity and accumulated yield are obtained by firstly having a material basis, namely a certain reserve abundance, and secondly having a production basis of gas in a stratum, namely seepage capability; the reserve abundance is mainly determined by the effective thickness, porosity and gas saturation, and the main parameters of the seepage capability are permeability and other parameters influencing the fluid flow. Factors for determining the better input-output ratio are mainly the development state of the development well, the cost, the gas price, the initial yield after the pressure, the decreasing rule, the valid period, the final accumulated yield and the like.
Optionally, the establishing a relational expression between productivity and the geological static parameter according to the geological static parameter affecting the offshore fracturing, the development dynamic of the development well and the formation pressure coefficient includes:
determining fracturing cost required by different development wells according to geological static parameters and development dynamics of the development wells;
and establishing a relational expression of the productivity and the geological static parameters by counting the relationship between the yield of the development well subjected to offshore fracturing and the geological static parameters.
And (3) taking geological static parameters, engineering parameters and economic parameters which influence the fracturing effect into consideration, acquiring geological static parameters, development dynamic state of a development well and formation pressure coefficients which influence the offshore fracturing, finding out main factors which influence the offshore fracturing effect, and avoiding blindly selecting the parameters.
S220, determining the sensitive parameter type influencing the yield after the offshore fracturing according to the relationship between the yield and the geological static parameters and the mechanism research result.
Wherein, for exploratory well, whether industrial oil gas flow exists or not is mainly considered, and the optimization of related geological static parameters is carried out with the aim of obtaining commercial production capacity after the pressure. The exploitation well needs to consider the productivity, the effective period and the accumulated production at the same time, so that not only the selected stratum and section geological static parameters contained in the exploratory well fracturing are considered, but also the exploitation dynamic and formation pressure coefficients are considered.
By counting the relationship between the yield after the fractured well pressure and the storage performance of the reservoir and the flow performance parameters of the reservoir and combining the mechanism research result, the correlation between the parameters such as effective thickness, porosity, gas saturation, permeability and maximum connected pore volume ratio and the like and the yield after the fracturing is good is determined, wherein the permeability and the water saturation are the parameters which influence the most sensitive.
And S230, reversely deducing a lower limit value of a sensitive parameter influencing the yield after the fracturing through the yield threshold value after the offshore fracturing according to the relational expression of the productivity and the geological static parameter.
Optionally, the step of reversely deducing a lower limit value of a sensitive parameter affecting the yield after fracturing through a yield threshold value after offshore fracturing according to a relational expression between the productivity and the geological static parameter includes:
calculating the commercial capacity required by the specification and the accumulated yield after fracturing according to the offshore reserves, and performing reverse thrust by establishing a capacity relation after fracturing to obtain a permeability lower limit value influencing the yield after fracturing;
obtaining the lower limit value of the reservoir critical gas saturation under different permeabilities according to the gas-water phase permeability analysis result contained in the relation between the productivity and the geological static parameter;
and performing reverse-deduction according to the relation between the movable water saturation and the water yield contained in the relation between the productivity and the geological static parameters to obtain the corresponding movable water saturation lower limit.
Wherein, the lower limit value of the sensitive parameter is reversely deduced according to the lower limit value of the capacity of the geological reserves submitted and proved by the marine oil and gas reserves regulation. The determination of the permeability lower limit value is verified by carrying out reverse-deduction according to the actual investment of the region, the accumulated yield after the pressure and the economic lower limit value besides establishing the capacity relation after the pressure and calculating the commercial capacity lower limit required by the standard according to the offshore reserves to obtain the lower limit value. Fig. 2B is a graph of a relationship between different permeabilities and gas phase saturations according to a second embodiment of the present invention, as shown in fig. 2B, the reservoir critical gas saturation requirements for obtaining different permeabilities are different, and the lower the permeability, the higher the gas saturation required for obtaining a commercial gas stream after pressurization; when the water saturation is less than 0.5mD, the reduction range of gas phase permeability is large; at water saturations greater than 0.5mD, the magnitude of the reduction in gas phase permeability is relatively small. Fig. 2C is a diagram of a relationship between different permeabilities and water saturations according to a second embodiment of the present invention, as shown in fig. 2C, the sum of the water saturation and the gas saturation is 1, the water saturation corresponding to a commercial oil and gas stream obtained after 1-10mD low-permeability gas lamination is 55%, and the lower limit of the corresponding gas saturation is 45%; the lower gas saturation limit for commercial oil and gas streams obtained after ultra low permeability gas lamination of less than 1mD is 55%.
Although the movable water saturation and the productivity are difficult to establish quantitative relation, according to the analysis of the actual fracturing effect, the movable water saturation is high, so that the water yield is high, and the water yield is high, so that the gas yield is reduced. Obtaining movable water saturation through nuclear magnetic experiments and well logging interpretation results, establishing a relation between the movable water saturation and water yield, counting water production of a well low-yield well with obviously reduced gas production rate due to large amount of water production according to a production dynamic curve after the production of the well in the area is put into operation, obtaining a water production range with obviously influenced productivity, and obtaining the movable water saturation lower limit corresponding to the large amount of water production.
Optionally, the method further includes:
and determining the stress difference of the storage separation layer, the well cementation quality, the Young modulus and the lower limit value of the Poisson ratio according to the experimental result, the offshore construction requirement and experience and the experience in the industry.
The improved performance parameters of the reservoir, namely the stress difference of the storage interlayer, the Young modulus, the Poisson ratio and the well cementation quality in engineering parameters play a key role in fracture shape and whether smooth construction can be carried out, for example, the stress difference of the storage interlayer and the well cementation quality determine whether an adjacent layer is pressed, the Young modulus and the Poisson ratio determine the optimization of a propping agent, a direct quantitative relation with yield is difficult to establish, and the improvement is mainly determined by the experience, research and experimental data of a implemented fracturing well.
According to the relational expression of the productivity and the geological static parameters, sensitive parameter types under different permeability, different development well development dynamics and different development states are given, the lower limit value of the sensitive parameter influencing the yield after the fracturing is reversely deduced through the yield threshold value after the offshore fracturing, whether the hypotonic-extra-hypotonic gas well subjected to the offshore pre-fracturing is economical and effective or not is judged quickly, and a decision basis is provided for a manager.
S240, determining a corresponding lower limit value of well control reserve according to the recovery ratio of the gas reservoir with different permeability and the lower limit value of the accumulative production of the development well with different permeability.
Determining a corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoir with different permeability and the accumulated yield lower limit value after fracturing under different permeability, wherein the determining comprises the following steps:
determining the lower limit value of the accumulated yield after fracturing under different permeabilities according to the decreasing rule after fracturing of the gas reservoir under the condition of different permeabilities;
and acquiring the recovery ratios of the gas reservoirs with different permeabilities, and determining the corresponding lower limit value of the well control reserves according to the ratio of the lower limit value of the accumulated yield after fracturing under different permeabilities to the recovery ratios of the gas reservoirs with different permeabilities.
In an alternative scheme of the embodiment of the invention, the exploratory well carries out offshore fracturing stratum selection and section selection according to the lower limit value of the sensitive parameter influencing the yield after fracturing; and developing a well to perform offshore fracturing layer selection and section selection according to the lower limit value of the sensitive parameter influencing the yield after fracturing, the lower limit value of well control reserve and the formation pressure coefficient.
The exploration well mainly considers whether the industrial oil-gas flow exists or not, and the optimization of related geological static parameters is carried out with the aim of obtaining commercial production capacity after the exploration well is pressed. The exploitation well needs to consider the productivity, the effective period and the accumulated production at the same time, so that not only the static parameters of the stratum of the selected layer and the selected section contained in the exploration well fracturing are considered, but also the exploitation dynamic and the stratum pressure coefficient are considered. Wherein the pressure coefficient is determined primarily according to industry specifications. Development wells are divided into three cases: fracturing on the well completion old well only needs to increase fracturing cost; the preparation of well-drilling fracturing requires the increase of well drilling cost and fracturing cost; a new production platform is required, which not only increases the cost of drilling and completion and fracturing, but also distributes the platform cost. The directional well and the horizontal well are divided under each condition, and 6 investment schemes are calculated in total. Obtaining initial yield after fracturing under different permeability conditions according to implemented well conditions, obtaining cumulative yield after fracturing of a hypotonic-extra-hypotonic gas reservoir with the permeability of more than 0.5mD according to a decreasing rule after fracturing of the hypotonic-extra-hypotonic gas reservoir under different permeability conditions, subdividing three conditions of 0.5-1 mD, 1-5 mD and 5-10 mD because of different permeability and different decreasing rules, and obtaining lower limit values of the cumulative yield after fracturing of a directional well and a development well under three conditions; and determining the corresponding well control reserve lower limit value according to the ratio of the accumulated yield lower limit value after fracturing under different permeability to the recovery ratio of the gas reservoir with different permeability.
For three different development trends of a development well, different offshore fracturing layer selection and section selection methods are established, the lower limit value of well control reserves is determined according to the accumulated yield after fracturing under different permeabilities and the recovery ratio, whether the offshore pre-fractured gas reservoir is economical and effective can be rapidly judged in advance, and the advance prediction of the offshore fracturing effect is realized.
The embodiment of the invention provides a method for selecting a stratum and a section by offshore fracturing, which is characterized by obtaining geological static parameters, development well development dynamics and formation pressure coefficients which influence offshore fracturing, finding out main factors which influence offshore fracturing effect, avoiding blind parameter selection, and establishing a relational expression of productivity and the geological static parameters according to the geological static parameters which influence offshore fracturing; determining the type of sensitive parameters influencing the yield after offshore fracturing according to the relationship between the yield and the geological static parameters and the mechanism research result; reversely deducing a lower limit value of a sensitive parameter influencing the yield after the fracturing through a yield threshold value after the offshore fracturing according to a relational expression of the productivity and the geological static parameter; determining a corresponding lower limit value of well control reserves according to the recovery rates of gas reservoirs with different permeabilities and the lower limit values of the accumulative yields of development wells with different permeabilities; the aim of knowing a reservoir and surrendering the reservoir is achieved by testing the productivity of the exploratory well, the developed well not only needs to consider the daily gas production or the unimpeded flow after pressing, but also needs to consider the accumulated yield and the input-output ratio, the old well fracturing of the well which is already drilled, the new well fracturing, the batch well fracturing of a production platform, the directional well fracturing, the horizontal well fracturing and other different conditions need different input, the required accumulated yield is different correspondingly, and the parameters and the limit values of the selected section of the selected layer are different; by adopting the technical scheme of the embodiment of the invention, whether the offshore pre-fractured hypotonic-extra-hypotonic gas well is economical and effective or not is quickly judged, the offshore fracturing effect is predicted in advance, and a decision basis is provided for managers.
EXAMPLE III
Fig. 3 is a schematic structural diagram of an offshore fracturing selection interval device provided by a third embodiment of the present invention, where the device includes: the system comprises a relational expression establishing module 310, a sensitive parameter lower limit value determining module 320 and a well control reserve lower limit value determining module 330. Wherein:
the relational expression establishing module 310 is used for establishing a relational expression between productivity and the geological static parameters according to the geological static parameters affecting the offshore fracturing, the development dynamic of the development well and the formation pressure coefficient;
the sensitive parameter lower limit value determining module 320 is used for determining the lower limit value of the sensitive parameter influencing the yield after fracturing according to the yield and geological static parameter relation formula after offshore fracturing; wherein the sensitive parameters comprise permeability, porosity, gas saturation, formation coefficient KH and maximum communicating pore throat radius;
the well control reserve lower limit value determining module 330 is configured to determine a corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoir with different permeabilities and the lower limit value of the cumulative production of the development well with different permeabilities.
On the basis of the foregoing embodiment, optionally, the relational expression establishing module 310 includes:
determining fracturing cost required by different development wells according to geological static parameters and development dynamics of the development wells;
establishing a relational expression of productivity and geological static parameters by counting the relation between the yield of the development well subjected to offshore fracturing and the geological static parameters;
the geological static parameters comprise reservoir performance of a reservoir, flow performance of the reservoir, transformation performance of the reservoir and economic parameters;
developing well development dynamics including fracturing on an old well that has been completed, preparing to fracture the well, and planning to build a new production platform; wherein the development wells comprise directional wells and horizontal wells.
On the basis of the foregoing embodiment, optionally, the sensitive parameter lower limit value determining module 320 includes:
counting the relationship between the yield of the development well after offshore fracturing and geological static parameters;
determining the type of sensitive parameters influencing the yield after offshore fracturing according to the relationship between the yield and the geological static parameters and the mechanism research result;
and reversely deducing the lower limit value of the sensitive parameter influencing the yield after the fracturing through the yield threshold value after the offshore fracturing according to the relational expression of the productivity and the geological static parameter.
On the basis of the foregoing embodiment, optionally, the reversely deducing the lower limit value of the sensitive parameter that affects the yield after fracturing through the yield threshold value after offshore fracturing according to the relational expression between the productivity and the geological static parameter includes:
calculating the commercial capacity required by the specification and the accumulated yield after fracturing according to the offshore reserves, and performing reverse thrust by establishing a capacity relation after fracturing to obtain a permeability lower limit value influencing the yield after fracturing;
obtaining the lower limit value of the reservoir critical gas saturation under different permeabilities according to the gas-water phase permeability analysis result contained in the relation between the productivity and the geological static parameter;
and performing reverse-deduction according to the relation between the movable water saturation and the water yield contained in the relation between the productivity and the geological static parameters to obtain the corresponding movable water saturation lower limit.
On the basis of the foregoing embodiment, optionally, the well control reserve lower limit value determining module 330 includes:
determining the lower limit value of the accumulated yield after fracturing under different permeabilities according to the decreasing rule after fracturing of the gas reservoir under the condition of different permeabilities;
and acquiring the recovery ratios of the gas reservoirs with different permeabilities, and determining the corresponding lower limit value of the well control reserves according to the ratio of the lower limit value of the accumulated yield after fracturing under different permeabilities to the recovery ratios of the gas reservoirs with different permeabilities.
On the basis of the above embodiment, optionally, the offshore fracturing interval selection method further includes:
and determining the stress difference of the storage separation layer, the well cementation quality, the Young modulus and the lower limit value of the Poisson ratio according to the experimental result, the offshore construction requirement and experience and the experience in the industry.
The device can execute the offshore fracturing stratum selection method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects for executing the offshore fracturing stratum selection method.
Example four
Fig. 4 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present application. The embodiment of the application provides electronic equipment, and the interactive device for offshore fracturing layer selection and section selection provided by the embodiment of the application can be integrated in the electronic equipment. As shown in fig. 4, the present embodiment provides an electronic device 400, which includes: one or more processors 420; a storage device 410, configured to store one or more programs, which when executed by the one or more processors 420, cause the one or more processors 420 to implement the method for selecting a interval for an offshore fracturing interval provided by the embodiment of the present application, the method including:
establishing a relational expression of productivity and the geological static parameters according to geological static parameters influencing offshore fracturing, development well development dynamics and formation pressure coefficients;
determining a lower limit value of a sensitive parameter influencing the yield after fracturing according to a relational expression of the productivity and the geological static parameter and through a yield threshold value after offshore fracturing; wherein the sensitive parameters comprise permeability, porosity, gas saturation, formation coefficient KH and maximum communicating pore throat radius;
and determining the corresponding lower limit value of the well control reserve according to the recovery ratio of the gas reservoir with different permeability and the lower limit value of the accumulative yield of the development well with different permeability.
Of course, those skilled in the art will appreciate that the processor 420 may also implement the solution of the offshore fracturing interval selection method provided in any embodiment of the present application.
The electronic device 400 shown in fig. 4 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.
As shown in fig. 4, the electronic device 400 includes a processor 420, a storage device 410, an input device 430, and an output device 440; the number of the processors 420 in the electronic device may be one or more, and one processor 420 is taken as an example in fig. 4; the processor 420, the storage device 410, the input device 430, and the output device 440 in the electronic apparatus may be connected by a bus or other means, and are exemplified by a bus 450 in fig. 4.
The storage device 410 is a computer-readable storage medium for storing software programs, computer-executable programs, and module units, such as program instructions corresponding to the method for selecting a section of an offshore fracturing zone in the embodiment of the present application.
The storage device 410 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the storage 410 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, storage 410 may further include memory located remotely from processor 420, which may be connected via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input means 430 may be used to receive input numbers, character information, or voice information, and to generate key signal inputs related to user settings and function control of the electronic device. The output device 440 may include a display screen, speakers, or other electronic equipment.
The electronic equipment provided by the embodiment of the application can achieve the technical effects of quickly judging whether a low-permeability ultra-low-permeability gas well subjected to offshore pre-fracturing is economical and effective and providing decision-making basis for managers.
EXAMPLE five
Fifth, an embodiment of the present invention further provides a storage medium containing computer executable instructions, which when executed by a computer processor, are configured to perform a method for offshore fracturing interval selection, the method comprising:
establishing a relational expression of productivity and the geological static parameters according to geological static parameters influencing offshore fracturing, development well development dynamics and formation pressure coefficients;
determining a lower limit value of a sensitive parameter influencing the yield after fracturing according to a relational expression of the productivity and the geological static parameter and through a yield threshold value after offshore fracturing; wherein the sensitive parameters comprise permeability, porosity, gas saturation, formation coefficient KH and maximum communicating pore throat radius;
and determining the corresponding lower limit value of the well control reserve according to the recovery ratio of the gas reservoir with different permeability and the lower limit value of the accumulative yield of the development well with different permeability.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read Only Memory (ROM), an Erasable Programmable Read Only Memory (EPROM), a flash Memory, an optical fiber, a portable CD-ROM, an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. A computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take a variety of forms, including, but not limited to: an electromagnetic signal, an optical signal, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, Radio Frequency (RF), etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for offshore fracturing and interval selection, which is characterized by comprising the following steps:
establishing a relational expression of productivity and the geological static parameters according to geological static parameters influencing offshore fracturing, development well development dynamics and formation pressure coefficients;
determining a lower limit value of a sensitive parameter influencing the yield after fracturing according to a relational expression of the productivity and the geological static parameter and through a yield threshold value after offshore fracturing; wherein the sensitive parameters comprise permeability, porosity, gas saturation, formation coefficient KH and maximum communicating pore throat radius;
and determining the corresponding lower limit value of the well control reserve according to the recovery ratio of the gas reservoir with different permeability and the lower limit value of the accumulative yield of the development well with different permeability.
2. The method of claim 1, wherein the establishing a relationship between productivity and geostatic parameters based on geostatic parameters affecting offshore fracturing, development well development dynamics, and formation pressure coefficients comprises:
determining fracturing cost required by different development wells according to geological static parameters and development dynamics of the development wells;
establishing a relational expression of productivity and geological static parameters by counting the relation between the yield of the development well subjected to offshore fracturing and the geological static parameters;
the geological static parameters comprise reservoir performance of a reservoir, flow performance of the reservoir, transformation performance of the reservoir and economic parameters;
developing well development dynamics including fracturing on an old well that has been completed, preparing to fracture the well, and planning to build a new production platform; wherein the development wells comprise directional wells and horizontal wells.
3. The method of claim 1, wherein determining a lower limit value of a sensitive parameter affecting a post-fracturing yield by a post-offshore fracturing yield threshold value according to a relation between productivity and geostationary parameters comprises:
counting the relationship between the yield of the development well after offshore fracturing and geological static parameters;
determining the type of sensitive parameters influencing the yield after offshore fracturing according to the relationship between the yield and the geological static parameters and the mechanism research result;
and reversely deducing the lower limit value of the sensitive parameter influencing the yield after the fracturing through the yield threshold value after the offshore fracturing according to the relational expression of the productivity and the geological static parameter.
4. The method of claim 3, wherein the step of back-deriving the lower limit of the sensitive parameter affecting the post-fracturing yield by the post-offshore fracturing yield threshold according to the relationship between the productivity and the geostationary parameter comprises:
calculating the commercial capacity required by the specification and the accumulated yield after fracturing according to the offshore reserves, and performing reverse thrust by establishing a capacity relation after fracturing to obtain a permeability lower limit value influencing the yield after fracturing;
obtaining the lower limit value of the reservoir critical gas saturation under different permeabilities according to the gas-water phase permeability analysis result contained in the relation between the productivity and the geological static parameter;
and performing reverse-deduction according to the relation between the movable water saturation and the water yield contained in the relation between the productivity and the geological static parameters to obtain the corresponding movable water saturation lower limit.
5. The method of claim 1, wherein determining the corresponding lower well-controlled reservoir value according to the recovery factor of the gas reservoir with different permeability and the lower cumulative post-fracturing production value with different permeability comprises:
determining the lower limit value of the accumulated yield after fracturing under different permeabilities according to the decreasing rule after fracturing of the gas reservoir under the condition of different permeabilities;
and acquiring the recovery ratios of the gas reservoirs with different permeabilities, and determining the corresponding lower limit value of the well control reserves according to the ratio of the lower limit value of the accumulated yield after fracturing under different permeabilities to the recovery ratios of the gas reservoirs with different permeabilities.
6. The method of claim 1, further comprising:
and determining the stress difference of the storage separation layer, the well cementation quality, the Young modulus and the lower limit value of the Poisson ratio according to the experimental result, the offshore construction requirement and experience and the experience in the industry.
7. An offshore fracturing selection interval device, characterized in that the device comprises:
the relational expression establishing module is used for establishing a relational expression between productivity and the geological static parameters according to the geological static parameters influencing offshore fracturing, development well development dynamics and formation pressure coefficients;
the sensitive parameter lower limit value determining module is used for determining the lower limit value of the sensitive parameter influencing the yield after fracturing through the yield threshold value after offshore fracturing according to the relational expression of the productivity and the geological static parameter; wherein the sensitive parameters comprise permeability, porosity, gas saturation, formation coefficient KH and maximum communicating pore throat radius;
and the well control reserve lower limit value determining module is used for determining the corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoir with different permeability and the lower limit value of the accumulative production of the development well with different permeability.
8. The apparatus of claim 7, wherein the relational expression building module comprises:
determining fracturing cost required by different development wells according to geological static parameters and development dynamics of the development wells;
establishing a relational expression of productivity and geological static parameters by counting the relationship between the yield of the development well subjected to offshore fracturing and the geological static parameters;
the geological static parameters comprise reservoir performance of a reservoir, flow performance of the reservoir, transformation performance of the reservoir and economic parameters;
developing well development dynamics including fracturing on an old well that has been completed, preparing to fracture the well, and planning to build a new production platform; wherein the development wells comprise directional wells and horizontal wells.
9. An electronic device, comprising:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the offshore fracture staging method of any of claims 1-6.
10. A computer readable storage medium having stored thereon a computer program, wherein the program when executed by a processor implements the offshore fracture staging method of any of claims 1-6.
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