CN114293961B - Offshore fracturing layer and section selecting method and device, electronic equipment and storage medium - Google Patents
Offshore fracturing layer 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 selecting a layer and a section in offshore fracturing, electronic equipment and a storage medium. The method comprises the following steps: establishing a relation between productivity and the geological static parameters according to the geological static parameters affecting offshore fracturing, development well development dynamics and formation pressure coefficients; determining a lower limit value of a sensitive parameter affecting the yield after fracturing according to a relation between the yield and the geological static parameter through a yield threshold value after fracturing at sea; wherein the sensitive parameters comprise permeability, porosity, gas saturation, stratum coefficient KH and maximum communication pore throat radius; and determining a corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoirs with different permeability and the accumulated production lower limit value of the development well with different permeability. By the technical scheme of the embodiment of the invention, whether the low permeability and ultra low permeability gas well of the offshore pre-fracturing is economic and effective or not can be rapidly 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 improvement, in particular to a method, a device, electronic equipment and a storage medium for selecting a layer and a section in offshore fracturing.
Background
Offshore fracturing costs are high, and if the pre-fracturing layer selection has no suitable standard, the loss of input and output is far greater than that of an onshore low-permeability hydrocarbon reservoir. Meanwhile, the offshore drilling cost is high, the number of wells is less than that of wells on land, the available sample points are few, and the conditions for establishing the layer selection and section selection standard by big data statistics are not provided. The existing method is a layer selecting and section selecting method or an effect judging method aiming at land shale gas and low permeability gas reservoir horizontal well staged fracturing, the covering condition is limited, the system is insufficient, and the exploration and evaluation purposes of exploratory wells and different conditions of economic effectiveness of development wells are not considered; the land fracturing cost is low, and the layer selection and section selection standard is not suitable for offshore moving with higher fracturing cost. Therefore, how to perform offshore fracturing layer selection and section selection is a technical problem to be solved by the technicians in the field.
Disclosure of Invention
The embodiment of the invention provides a method, a device, electronic equipment and a storage medium for selecting a layer by offshore fracturing, which are used for rapidly judging whether an offshore pre-fractured hypotonic-ultra hypotonic gas well is economic and effective or not and providing decision basis for a manager.
In a first aspect, an embodiment of the present invention provides a method for selecting a layer and a section in offshore fracturing, including:
Establishing a relation between productivity and the geological static parameters according to the geological static parameters affecting offshore fracturing, development well development dynamics and formation pressure coefficients;
Determining a lower limit value of a sensitive parameter affecting the yield after fracturing according to a relation between the yield and the geological static parameter through a yield threshold value after fracturing at sea; wherein the sensitive parameters comprise permeability, porosity, gas saturation, stratum coefficient KH and maximum communication pore throat radius;
and determining a corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoirs with different permeability and the accumulated production lower limit value of the development well with different permeability.
In a second aspect, an embodiment of the present invention further provides an offshore fracturing layer selecting device, including:
the relational establishment module is used for establishing a relational expression of productivity and the geological static parameters according to the geological static parameters affecting 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 post-fracturing yield through the post-offshore fracturing yield threshold value according to the relation between the productivity and the geological static parameter; wherein the sensitive parameters comprise permeability, porosity, gas saturation, stratum coefficient KH and maximum communication 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 reservoirs with different permeability and the development well accumulation lower limit value with different permeability.
In a third aspect, an embodiment of the present invention further provides an electronic device, including:
One or more processors;
A storage means for storing one or more programs;
And when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the offshore fracturing layer selection method according to any embodiment of the present invention.
In a fourth aspect, an embodiment of the present invention further provides a computer readable storage medium, where a computer program is stored, where the program when executed by a processor implements the offshore fracturing layer selection method according to any embodiment of the present invention.
The embodiment of the invention provides a method, a device, electronic equipment and a storage medium for selecting a layer by offshore fracturing, which are used for establishing the relation between productivity and geological static parameters according to the geological static parameters affecting offshore fracturing, development dynamics of a development well and formation pressure coefficients; determining a lower limit value of a sensitive parameter affecting the yield after fracturing according to a relation between the yield and the geological static parameter through a yield threshold value after fracturing at sea; wherein the sensitive parameters comprise permeability, porosity, gas saturation, stratum coefficient KH and maximum communication pore throat radius; and determining a corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoirs with different permeability and the accumulated production lower limit value of the development well with different permeability. According to the technical scheme provided by the embodiment of the invention, the geological static parameters, engineering parameters and economic parameters which influence the fracturing effect are considered, the sensitive parameter lower limit values under different permeability, different well types and different development states are classified and given, so that whether the low permeability-ultra low permeability gas well for offshore pre-fracturing is economic and effective or not is rapidly judged, 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 layer according to an embodiment of the invention;
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;
FIG. 2B is a graph showing the relationship between permeability and gas phase saturation according to the second embodiment of the present invention;
FIG. 2C is a graph of water saturation versus permeability for a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of an offshore fracturing layer selecting and segment 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 invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts operations (or steps) as a sequential process, many of the operations (or steps) can be performed in parallel, concurrently, or at the same time. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Offshore fracturing costs are high, and if the pre-fracturing layer selection has no suitable standard, the loss of input and output is far greater than that of an onshore low-permeability hydrocarbon reservoir. The main technological method in the prior art is to acquire basic data of an oil and gas well, including gas-containing data of a reservoir, mineral and rock mechanical 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 fracturing effects, apply carding statistics and fuzzy mathematic theory to quantify parameter weights affecting the fracturing effects, calculate and obtain a comprehensive parameter, establish a relation with daily yield after fracturing or unimpeded flow, obtain a comprehensive parameter limit value corresponding to the effective yield, and realize advanced quantitative prediction of the fracturing well section effect. But the prior art is directed to fracturing under certain conditions of land shale gas or hypotonic gas reservoirs, such as secondary fracturing or horizontal section fracturing. The coverage is limited and not enough. Firstly, the land fracturing cost is low, and the layer selection and section selection standard is not suitable for offshore moving with higher fracturing cost. Second, the exploration evaluation objectives of the exploratory well and the economic effectiveness of the development well are not considered. The determination of the sensitive parameters and the limit values is mainly obtained by a mathematical statistical method, and the selected parameters are more random, have not only the original measured data, but also the parameters after processing, and are not explained from the mechanism angle why the parameters are possibly not applicable to other areas. And limited by the number and representativeness of sample points, statistics may deviate from the inherent parametric relationship with fewer offshore fracturing wells. According to the mathematical statistics, the parameter weight value is obtained, and new evaluation parameters are reconstructed, so that the intrinsic reasons of different influences of parameters such as gas saturation and the like on fracturing effects under different conditions of hypotonic-ultra hypotonic are possibly covered, the simple quantitative calculation is carried out, and the lack of a comprehensive analysis method can lead to the mutual influence results of multi-parameter influence factors under different conditions. Therefore, the embodiment of the invention provides a layer and section selecting method for offshore fracturing, which can rapidly judge whether the offshore pre-fractured hypotonic-ultra-hypotonic gas well is economic and effective, and provides decision basis for a manager.
Example 1
Fig. 1 is a flowchart of a method for selecting a layer by fracturing at sea according to an embodiment of the present invention, where the embodiment is applicable to a situation of performing fracturing layer selection on a hypotonic-ultra hypotonic gas reservoir at sea, the method of the present embodiment may be performed by an apparatus for selecting a layer by fracturing at sea, and the apparatus may be implemented in a hardware and/or software manner. The device can be configured in a server for offshore fracturing layer selection and section selection. The method specifically comprises the following steps:
S110, establishing a relation between productivity and the geological static parameters according to the geological static parameters affecting offshore fracturing, development dynamics of the development well and formation pressure coefficients.
Wherein, geostatistical parameters may refer to parameters reflecting geologic properties, including, for example, but not limited to, reservoir properties of the reservoir, reservoir flow properties, reservoir reformation properties, and economic parameters; reservoir performance parameters of a reservoir are the basis for stimulation of materials including, but not limited to, parameters characterizing porosity, gas saturation, and effective thickness of the reservoir individual storage coefficients and reservoir abundances; the flow property-seepage parameter of the reservoir is a production foundation reflecting seepage supply capacity and is increased after fracturing, and the production foundation comprises parameters including, but not limited to, matrix permeability, pore throat radius, formation pressure and the like; the modification performance parameters of the reservoir are parameters such as rock compressibility, including but not limited to reservoir stress differences, young's modulus, poisson's ratio, and well cementation quality. The economic parameters mainly comprise input-output ratio, namely investment cost, accumulated gas production, gas price and other factors, and the main influencing factors are accumulated output and residual geological reserves under the condition of small fluctuation of gas price.
Development well development dynamics may refer to the development state of the development well at present, including, for example, but not limited to fracturing on old wells that have been drilled, preparing to drill a well, and planning to create a production platform; wherein the development well comprises a directional well and a horizontal well.
The formation pressure coefficient may refer to the ratio of formation pressure to hydrostatic column pressure, which is a primary parameter used to determine whether formation pressure is abnormal. For example, when the formation pressure is equal to 1, the formation pressure is normal; when the formation pressure is greater than 1, the formation pressure is referred to as high anomaly formation pressure or high pressure anomaly; when the formation pressure is less than 1, it is referred to as a low anomaly formation pressure, or low pressure anomaly. Where formation pressure refers to the pressure acting on fluids (e.g., oil, gas, and water) within the rock pores, and hydrostatic pressure is the pressure caused by the weight of the liquid column.
The relation between the productivity and the geological static parameters can be established according to the well logging data, analysis and test data, test and production data, fracturing construction parameters and related research results of the past fracturing wells.
S120, determining the lower limit value of the sensitive parameter affecting the post-fracturing yield according to the relation between the productivity and the geological static parameter through the post-fracturing yield threshold value at sea.
The sensitive parameters may be parameters that have the most sensitive influence on the post-offshore fracturing yield, for example, by counting the relation between the post-fracturing yield of a fractured well and the reservoir performance and the flow performance parameters of the reservoir, and determining that the permeability and the water saturation are the most sensitive parameters affecting the post-offshore fracturing yield according to the research result of the mechanism. Wherein the sensitive parameters include permeability, porosity, gas saturation, formation coefficient KH, and maximum pore throat radius.
S130, determining a corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoirs with different permeability and the accumulated lower limit value of the development well with different permeability.
The recovery ratio can be the ratio of the final gas production of the gas reservoir to the oil and gas geological reserves, and is an important index for measuring the development level of the gas reservoir. In an alternative scheme of the embodiment of the invention, the recovery ratio of the gas reservoir is different under different permeabilities, and the higher the permeabilities are in a preset range, the higher the recovery ratio of the gas reservoir is, for example, the permeabilities are in a range of 0-1 x 10 -3μm2, and the permeabilities are 35% -40%; the permeability is within the interval of 1-10 x 10 -3μm2, and the permeability is 40% -50%.
The well control reserves can be 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 is facilitated.
The embodiment of the invention provides a marine fracturing layer selecting and section selecting method, which establishes a relation between productivity and a geological static parameter according to the geological static parameter affecting marine fracturing, development well development dynamic and stratum pressure coefficient; determining a lower limit value of a sensitive parameter affecting the yield after fracturing according to a relation between the yield and the geological static parameter through a yield threshold value after fracturing at sea; wherein the sensitive parameters comprise permeability, porosity, gas saturation, stratum coefficient KH and maximum communication pore throat radius; and determining a corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoirs with different permeability and the accumulated production lower limit value of the development well with different permeability. According to the technical scheme provided by the embodiment of the invention, the geological static parameters, engineering parameters and economic parameters which influence the fracturing effect are considered, the sensitive parameter lower limit values under different permeability, different well types and different development states are classified and given, so that whether the low permeability-ultra low permeability gas well for offshore pre-fracturing is economic and effective or not is rapidly judged, 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 may be further optimized on the basis of the foregoing embodiments, and may be combined with each of the alternatives of one or more of the foregoing embodiments. As shown in fig. 2A, the offshore fracturing layer selecting method provided in the embodiment of the invention may include the following steps:
S210, establishing a relation between productivity and the geological static parameters according to the geological static parameters affecting offshore fracturing, development dynamics of a development well and formation pressure coefficients.
The high cost of offshore fracturing determines the formation that must be suitable for fracturing from an input-to-output ratio point of view, the key factors that determine whether a formation is suitable for fracturing are: firstly, the stratum can be successfully fractured, secondly, better productivity is obtained after fracturing, and finally, economic benefit is obtained under the condition of a certain investment cost. The main factors determining that the stratum can successfully carry out fracturing from the angle of well selection and stratum selection are whether the stratum has fracturing conditions or not and whether the stratum has engineering parameters of compressibility or not; the material basis, namely certain reserve abundance, and the production basis, namely seepage capability, of the gas in the stratum are firstly needed to obtain better productivity and accumulated yield after the pressure is determined; the reserve abundance is mainly determined by the effective thickness, porosity, gas saturation and other parameters, and the seepage capability is mainly determined by the permeability and other parameters affecting the fluid flow. Factors determining a better input-output ratio are mainly development state of a development well, cost, gas price, initial yield after pressure, decreasing rule, validity period, final accumulated yield and the like.
Optionally, the establishing a relation between the productivity and the geostatistical parameter according to the geostatistical parameter affecting offshore fracturing, development well development dynamics and formation pressure coefficient includes:
Determining fracturing cost required by different development wells according to the geological static parameters and development dynamics of the development wells;
And (3) counting the relation between the yield and the geological static parameters after the offshore fracturing is carried out by the development well, and establishing a relation formula for establishing the yield and the geological static parameters.
And taking the geological static parameters, engineering parameters and economic parameters which influence the fracturing effect into consideration, acquiring the geological static parameters, development dynamics of a development well and formation pressure coefficients which influence the offshore fracturing effect, finding out main factors which influence the offshore fracturing effect, and avoiding blind parameter selection.
S220, determining the type of the sensitive parameters affecting the offshore fracturing yield according to the relation between the yield and the geological static parameters and the mechanism research result.
For exploratory wells, whether industrial oil gas flows are important is considered, and optimization of relevant geostatistical parameters is performed with the aim of obtaining commercial productivity after pressing. The development well needs to consider productivity, validity period and cumulative yield at the same time, so that not only the geological static parameters of the selected layers and selected sections contained in the exploratory well fracturing are considered, but also the development dynamics and the formation pressure coefficient are considered.
By counting the relation between the post-fracturing yield of the fractured well and the reservoir property and the flow property parameters of the reservoir, and combining the mechanism research result, the parameters such as effective thickness, porosity, gas saturation, permeability, maximum connected pore volume ratio and the like are determined to have good correlation with the post-fracturing yield, wherein the permeability and the water saturation are the most sensitive parameters.
S230, according to the relation between the productivity and the geological static parameters, the lower limit value of the sensitive parameters affecting the post-fracturing yield is reversely pushed through the post-offshore fracturing yield threshold value.
Optionally, the step of reversely pushing the lower limit value of the sensitive parameter affecting the post-fracturing yield by the post-offshore fracturing yield threshold according to the relation between the productivity and the geostatistical parameter includes:
According to commercial productivity required by offshore reserves calculation specifications and cumulative yield after fracturing, performing back-pushing by establishing a relation with the productivity after fracturing to obtain a permeability lower limit value affecting the yield after fracturing;
Obtaining the lower limit value of the critical gas saturation of the reservoir under different permeability according to the gas-water permeability analysis result contained in the relation between the productivity and the geological static parameters;
And (3) reversely pushing 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 a corresponding lower limit of the movable water saturation.
And the lower limit value of the sensitivity parameter is reversely deduced according to the lower limit of the productivity of the geological reserve which is submitted and determined according to the requirements of offshore oil and gas reserves Specification. The lower limit value of the permeability is determined by establishing a relation between the permeability and the capacity after pressure, obtaining the lower limit value according to the lower limit of the commercial capacity required by the offshore reserve calculation specification through back-pushing, and performing verification according to the actual investment of the region, the accumulated yield after pressure and the lower limit value of the economy. FIG. 2B is a graph showing the relationship between different permeabilities and gas phase saturation according to the second embodiment of the present invention, as shown in FIG. 2B, the requirements for critical gas saturation of reservoirs with different permeabilities are different, and the lower the permeabilities, the higher the gas saturation required for obtaining commercial oil gas flows after pressurization; when the water saturation is less than 0.5mD, the gas phase permeability is greatly reduced; at water saturation greater than 0.5mD, the gas phase permeability decreases relatively little. FIG. 2C is a graph showing the relationship between water saturation and water saturation of a commercial oil gas stream obtained by laminating hypotonic gas having a total of 1,1-10mD, and a lower limit of 45% as shown in FIG. 2C; the gas saturation lower limit of the commercial oil gas stream obtained after lamination of very low permeability gas of less than 1mD is 55%.
Although the movable water saturation and the productivity are difficult to establish a quantitative relation, according to the analysis of actual fracturing effect, the fact that the movable water saturation is high results in high water yield and the high water yield can reduce the gas yield is found. And obtaining movable water saturation through nuclear magnetic experiment and well logging interpretation results, establishing a relation between the movable water saturation and water yield, and counting well low-yield well water yield with obviously reduced gas yield due to large water yield according to a production dynamic curve of the produced wells in the region, so as to obtain a water yield range with obviously influenced productivity, and obtaining a movable water saturation lower limit corresponding to the large water yield.
Optionally, the method further comprises:
and determining the stress difference of the storage layer, the well cementation quality, the Young modulus and the Poisson's ratio lower limit value according to experimental results, offshore construction requirements and experience and industry experience.
The reformable performance parameters of the reservoir, namely the stress difference of the reservoir layer, the Young modulus, the Poisson ratio and the well cementation quality in engineering parameters play a key role in crack morphology and whether the construction can be successfully performed, for example, the stress difference of the reservoir layer and the well cementation quality determine whether a channeling layer is pressed, the Young modulus and the Poisson ratio determine the preference of propping agents, and the direct quantitative relation with the yield is difficult to establish and is mainly determined through experience, investigation and experimental data of the implemented fracturing well.
According to the relation between productivity and 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 fracturing is reversely pushed through the yield threshold value after fracturing at sea, and whether the low-permeability and ultra-low-permeability gas well pre-fracturing at sea is economic and effective or not is judged rapidly, and decision basis is provided for a manager.
S240, determining a corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoirs with different permeability and the accumulated lower limit value of the development well with different permeability.
Wherein, according to the recovery ratio of the gas reservoirs with different permeabilities and the lower limit value of the accumulated output after fracturing under different permeabilities, determining the corresponding lower limit value of the well control reserve comprises the following steps:
Determining the lower limit value of the accumulated output after fracturing under different permeability according to the decreasing rule of the gas reservoir after fracturing under different permeability;
And acquiring the recovery ratio of the gas reservoirs with different permeabilities, and determining the corresponding well control reserve lower limit value according to the ratio of the cumulative output lower limit value after fracturing under different permeabilities to the recovery ratio of the gas reservoirs with different permeabilities.
In an alternative scheme of the embodiment of the invention, the exploratory well performs offshore fracturing layer selection according to the lower limit value of the sensitive parameter affecting the yield after fracturing; and developing the well to perform offshore fracturing layer selection according to the lower limit value of the sensitive parameter affecting the yield after fracturing, the lower limit value of the well control reserve and the formation pressure coefficient.
The exploratory well focuses on whether to consider industrial oil gas streams, and performs optimization of relevant geostatistical parameters with the aim of obtaining commercial productivity after pressing. The development well needs to consider productivity, validity period and cumulative production at the same time, so that not only the static parameters of the stratum and section selection stratum contained in the exploratory well fracturing are considered, but also the development dynamics and stratum pressure coefficient are considered. Wherein the pressure coefficient is determined mainly according to industry specifications. Development wells fall into three categories: fracturing on the old well with the well completion already completed only needs to increase the fracturing cost; preparing well-drilling and fracturing, and increasing drilling cost and fracturing cost; the newly-built production platform is needed, so that the cost of drilling and completion and fracturing is increased, and the cost of the platform is shared. The three cases above are in each case subdivided into directional and horizontal wells, totaling 6 investment schemes. Obtaining initial post-fracturing yield under different permeability conditions according to implemented well conditions, obtaining accumulated post-fracturing yield of the low-permeability and ultra-low-permeability reservoir with the permeability of more than 0.5mD according to the decreasing rule of the low-permeability and ultra-low-permeability reservoir under different permeability conditions, and subdividing three conditions of 0.5-1 mD, 1-5 mD and 5-10 mD according to the decreasing rule of the low-permeability and ultra-low-permeability reservoir under different permeability conditions to obtain the accumulated yield lower limit value of the directional well and the developed well after fracturing under the three conditions; and determining a corresponding well control reserve lower limit value according to the ratio of the cumulative output lower limit value after fracturing under different permeabilities to the recovery ratio of the gas reservoirs with different permeabilities.
For three different development dynamics of the development well, different offshore fracturing layer selection methods are established, the lower limit value of well control reserves is determined according to the accumulated output after fracturing and the recovery ratio under different permeability, whether the offshore pre-fractured gas reservoir is economic and effective can be rapidly judged, and the advanced prediction of the offshore fracturing effect is realized.
The embodiment of the invention provides a marine fracturing layer selecting and section selecting method, which comprises the steps of obtaining geological static parameters affecting marine fracturing, development dynamics of a development well and stratum pressure coefficients, finding out main factors affecting the marine fracturing effect, avoiding blind parameter selection, and establishing a relation between productivity and the geological static parameters according to the geological static parameters affecting the marine fracturing; determining the type of sensitive parameters affecting the offshore fracturing yield according to the relation between the yield and the geological static parameters and the mechanism research result; according to the relation between the productivity and the geological static parameters, the lower limit value of the sensitive parameters influencing the yield after fracturing is reversely deduced through the yield threshold value after fracturing at sea; determining a corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoirs with different permeability and the accumulated yield lower limit value of the development well with different permeability; the method is characterized in that the purposes of knowing a reservoir and uploading and ascertaining reserves are achieved through exploratory wells according to test productivity, the development wells are required to consider not only daily gas production or unimpeded flow after pressure, but also cumulative production and input-output ratio, old well fracturing of well is required to be performed, new well fracturing is required to be performed, production platform batch well fracturing is required to be performed to be constructed, directional well fracturing, horizontal well fracturing and other different conditions are required to be performed, the corresponding required cumulative yield is also different, and parameters and limit values of layer selection and section selection are different; by adopting the technical scheme of the embodiment of the invention, whether the low permeability and ultra low permeability gas well for offshore pre-fracturing is economic and effective or not can be rapidly judged, the advanced prediction of the offshore fracturing effect can be realized, and a decision basis can be provided for a manager.
Example III
Fig. 3 is a schematic structural diagram of an offshore fracturing layer selecting and segment selecting device according to a third embodiment of the present invention, where the device includes: a relationship establishment module 310, a sensitive parameter lower limit determination module 320, and a well control reserves lower limit determination module 330. Wherein:
A relational establishment module 310, configured to establish a relational expression of productivity and the geostatistical parameters according to the geostatistical parameters affecting offshore fracturing, development dynamics of the development well, and formation pressure coefficients;
The sensitive parameter lower limit value determining module 320 is configured to determine a lower limit value of a sensitive parameter affecting the post-fracturing yield according to a relation between the productivity and the geostatistical parameter, by the post-fracturing yield at sea; wherein the sensitive parameters comprise permeability, porosity, gas saturation, stratum coefficient KH and maximum communication 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 reservoirs with different permeability and the development well accumulation lower limit value with different permeability.
Based on the above embodiment, optionally, the relational expression establishing module 310 includes:
Determining fracturing cost required by different development wells according to the geological static parameters and development dynamics of the development wells;
Establishing a relation between productivity and geological static parameters by counting the relation between the yield and the geological static parameters after the offshore fracturing of the development well;
Wherein the geostatistical parameters include reservoir properties of the reservoir, reservoir flow properties, reservoir reformation properties, and economic parameters;
developing well development dynamics including fracturing on old wells that have been drilled, preparing well-drilling fracturing, and planning new production platforms; wherein the development well comprises a directional well and a horizontal well.
On the basis of the above embodiment, optionally, the sensitive parameter lower limit value determining module 320 includes:
counting the relation between the yield of the development well after offshore fracturing and the geological static parameters;
Determining the type of sensitive parameters affecting the offshore fracturing yield according to the relation between the yield and the geological static parameters and the mechanism research result;
And according to the relation between the productivity and the geological static parameters, reversely pushing the lower limit value of the sensitive parameters influencing the yield after fracturing through the yield threshold value after fracturing at sea.
On the basis of the foregoing embodiment, optionally, the step of reversely pushing, according to a relation between the productivity and the geostatistical parameter, a lower limit value of a sensitive parameter affecting the post-fracturing yield by using a post-offshore fracturing yield threshold value includes:
According to commercial productivity required by offshore reserves calculation specifications and cumulative yield after fracturing, performing back-pushing by establishing a relation with the productivity after fracturing to obtain a permeability lower limit value affecting the yield after fracturing;
Obtaining the lower limit value of the critical gas saturation of the reservoir under different permeability according to the gas-water permeability analysis result contained in the relation between the productivity and the geological static parameters;
And (3) reversely pushing 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 a corresponding lower limit of the movable water saturation.
Based on the above embodiments, optionally, the well control reserve lower limit value determining module 330 includes:
Determining the lower limit value of the accumulated output after fracturing under different permeability according to the decreasing rule of the gas reservoir after fracturing under different permeability;
And acquiring the recovery ratio of the gas reservoirs with different permeabilities, and determining the corresponding well control reserve lower limit value according to the ratio of the cumulative output lower limit value after fracturing under different permeabilities to the recovery ratio of the gas reservoirs with different permeabilities.
On the basis of the above embodiment, optionally, the offshore fracturing layer selecting and segment selecting method further includes:
and determining the stress difference of the storage layer, the well cementation quality, the Young modulus and the Poisson's ratio lower limit value according to experimental results, offshore construction requirements and experience and industry experience.
The device can execute the offshore fracturing layer selecting and segment selecting method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of executing the offshore fracturing layer selecting and segment selecting method.
Example IV
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; the storage device 410 is configured to store one or more programs, where the one or more programs are executed by the one or more processors 420, so that the one or more processors 420 implement the offshore fracturing layer selection method provided by the embodiment of the present application, and the method includes:
Establishing a relation between productivity and the geological static parameters according to the geological static parameters affecting offshore fracturing, development well development dynamics and formation pressure coefficients;
Determining a lower limit value of a sensitive parameter affecting the yield after fracturing according to a relation between the yield and the geological static parameter through a yield threshold value after fracturing at sea; wherein the sensitive parameters comprise permeability, porosity, gas saturation, stratum coefficient KH and maximum communication pore throat radius;
and determining a corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoirs with different permeability and the accumulated production lower limit value of the development well with different permeability.
Of course, those skilled in the art will understand that the processor 420 further implements the technical solution of the offshore fracturing layer selection method provided in any embodiment of the present application.
The electronic device 400 shown in fig. 4 is merely an example and should not be construed as limiting the functionality and scope of use of 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 processors 420 in the electronic device may be one or more, one processor 420 being 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 device may be connected by a bus or other means, as exemplified by connection via a bus 450 in fig. 4.
The storage device 410 is used as a computer readable storage medium for storing a software program, a computer executable program, and a module unit, such as program instructions corresponding to the offshore fracturing layer selection method in the embodiment of the 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, at least one application program required for functions; the storage data area may store data created according to the use of the terminal, etc. In addition, 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 device 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 device 430 may be used to receive input numeric, 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 an electronic device such as a display screen, a speaker, etc.
The electronic equipment provided by the embodiment of the application can achieve the technical effects of rapidly judging whether the low permeability-ultra low permeability gas well of the offshore pre-fracturing is economic and effective and providing decision basis for a manager.
Example five
A fifth embodiment of the present invention also provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are for performing an offshore fracturing layer selection method, the method comprising:
Establishing a relation between productivity and the geological static parameters according to the geological static parameters affecting offshore fracturing, development well development dynamics and formation pressure coefficients;
Determining a lower limit value of a sensitive parameter affecting the yield after fracturing according to a relation between the yield and the geological static parameter through a yield threshold value after fracturing at sea; wherein the sensitive parameters comprise permeability, porosity, gas saturation, stratum coefficient KH and maximum communication pore throat radius;
and determining a corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoirs with different permeability and the accumulated production lower limit value of the development well with different permeability.
The computer storage media of embodiments of the invention may take the form of 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. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any 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 (Random Access Memory, RAM), a Read-Only Memory (ROM), an erasable programmable Read-Only Memory (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.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to: electromagnetic signals, optical signals, or any suitable combination of the preceding. 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 (RadioFrequency, RF), or the like, or any suitable combination of the foregoing.
Computer program code for carrying out operations 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 ++ 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 kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. An offshore fracturing layer selecting and segment selecting method, which is characterized by comprising the following steps of:
Establishing a relation between productivity and the geological static parameters according to the geological static parameters affecting offshore fracturing, development well development dynamics and formation pressure coefficients; wherein the geostatistical parameters include reservoir properties of the reservoir, reservoir flow properties, reservoir reformation properties, and economic parameters; developing well development dynamics including fracturing on old wells that have been drilled, preparing well-drilling fracturing, and planning new production platforms; wherein the development well comprises a directional well and a horizontal well;
Determining a lower limit value of a sensitive parameter affecting the yield after fracturing according to a relation between the yield and the geological static parameter through a yield threshold value after fracturing at sea; wherein the sensitive parameters comprise permeability, porosity, gas saturation, stratum coefficient KH and maximum communication pore throat radius;
Determining a corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoirs with different permeability and the accumulated yield lower limit value of the development well with different permeability;
the method for determining the lower limit value of the sensitive parameter affecting the post-fracturing yield by the post-fracturing yield threshold value according to the relation between the productivity and the geological static parameter comprises the following steps:
Counting the relation between the yield of the development well after offshore fracturing and the geological static parameters; determining the type of sensitive parameters affecting the offshore fracturing yield according to the relation between the yield and the geological static parameters and the mechanism research result; according to the relation between the productivity and the geological static parameters, the lower limit value of the sensitive parameters influencing the yield after fracturing is reversely deduced through the yield threshold value after fracturing at sea;
Correspondingly, the method for reversely pushing the lower limit value of the sensitive parameter influencing the post-fracturing yield through the post-offshore fracturing yield threshold value according to the relation between the productivity and the geological static parameter comprises the following steps:
According to commercial productivity required by offshore reserves calculation specifications and cumulative yield after fracturing, performing back-pushing by establishing a relation with the productivity after fracturing to obtain a permeability lower limit value affecting the yield after fracturing; obtaining the lower limit value of the critical gas saturation of the reservoir under different permeability according to the gas-water permeability analysis result contained in the relation between the productivity and the geological static parameters; and (3) reversely pushing 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 a corresponding lower limit of the movable water saturation.
2. The method of claim 1, wherein establishing the capacity versus geostatistical parameter relationship based on geostatistical parameters affecting offshore fracturing, development well development dynamics, and formation pressure coefficients comprises:
Determining fracturing cost required by different development wells according to the geological static parameters and development dynamics of the development wells;
and (3) establishing a relation between the productivity and the geological static parameters by counting the relation between the yield and the geological static parameters after the offshore fracturing of the development well.
3. The method of claim 1, wherein determining the corresponding well control reserve lower limit based on the recovery of the different permeability reservoirs and the post-fracture cumulative yield lower limit at the different permeability comprises:
Determining the lower limit value of the accumulated output after fracturing under different permeability according to the decreasing rule of the gas reservoir after fracturing under different permeability;
And acquiring the recovery ratio of the gas reservoirs with different permeabilities, and determining the corresponding well control reserve lower limit value according to the ratio of the cumulative output lower limit value after fracturing under different permeabilities to the recovery ratio of the gas reservoirs with different permeabilities.
4. The method according to claim 1, wherein the method further comprises:
and determining the stress difference of the storage layer, the well cementation quality, the Young modulus and the Poisson's ratio lower limit value according to experimental results, offshore construction requirements and experience and industry experience.
5. An offshore fracturing layer selection device, the device comprising:
The relational establishment module is used for establishing a relational expression of productivity and the geological static parameters according to the geological static parameters affecting offshore fracturing, development well development dynamics and formation pressure coefficients; wherein the geostatistical parameters include reservoir properties of the reservoir, reservoir flow properties, reservoir reformation properties, and economic parameters; developing well development dynamics including fracturing on old wells that have been drilled, preparing well-drilling fracturing, and planning new production platforms; wherein the development well comprises a directional well and a horizontal well;
the sensitive parameter lower limit value determining module is used for determining the lower limit value of the sensitive parameter influencing the post-fracturing yield through the post-offshore fracturing yield threshold value according to the relation between the productivity and the geological static parameter; wherein the sensitive parameters comprise permeability, porosity, gas saturation, stratum coefficient KH and maximum communication pore throat radius;
The well control reserve lower limit value determining module is used for determining a corresponding well control reserve lower limit value according to the recovery ratio of the gas reservoirs with different permeability and the development well accumulation lower limit value with different permeability;
the sensitivity parameter lower limit value determining module is specifically configured to:
Counting the relation between the yield of the development well after offshore fracturing and the geological static parameters; determining the type of sensitive parameters affecting the offshore fracturing yield according to the relation between the yield and the geological static parameters and the mechanism research result; according to the relation between the productivity and the geological static parameters, the lower limit value of the sensitive parameters influencing the yield after fracturing is reversely deduced through the yield threshold value after fracturing at sea;
Correspondingly, the lower limit value of the sensitive parameter influencing the yield after fracturing is reversely pushed through the yield threshold value after offshore fracturing according to the relation between the yield and the geological static parameter, and is specifically used for:
According to commercial productivity required by offshore reserves calculation specifications and cumulative yield after fracturing, performing back-pushing by establishing a relation with the productivity after fracturing to obtain a permeability lower limit value affecting the yield after fracturing; obtaining the lower limit value of the critical gas saturation of the reservoir under different permeability according to the gas-water permeability analysis result contained in the relation between the productivity and the geological static parameters; and (3) reversely pushing 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 a corresponding lower limit of the movable water saturation.
6. The apparatus of claim 5, wherein the relationship establishment module comprises:
Determining fracturing cost required by different development wells according to the geological static parameters and development dynamics of the development wells;
and (3) establishing a relation between the productivity and the geological static parameters by counting the relation between the yield and the geological static parameters after the offshore fracturing of the development well.
7. An electronic device, comprising:
One or more processors;
A storage means for storing one or more programs;
The one or more programs, when executed by the one or more processors, cause the one or more processors to implement the offshore fracturing layer selection method of any of claims 1-4.
8. A computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor implements the offshore fracturing layer selection method of any of claims 1-4.
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