CN110955985A - Method and device for optimizing fracturing construction parameters and readable storage medium - Google Patents
Method and device for optimizing fracturing construction parameters and readable storage medium Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 141
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- 238000011160 research Methods 0.000 claims abstract description 17
- 238000005457 optimization Methods 0.000 claims abstract description 15
- 239000011229 interlayer Substances 0.000 claims description 27
- 239000010410 layer Substances 0.000 claims description 16
- 208000010392 Bone Fractures Diseases 0.000 claims description 13
- 206010017076 Fracture Diseases 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 5
- 206010010214 Compression fracture Diseases 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000011161 development Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
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- E—FIXED CONSTRUCTIONS
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
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- E21B43/26—Methods for stimulating production by forming crevices or fractures
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Abstract
The invention discloses a fracturing construction parameter optimization method, equipment and a readable storage medium, wherein the fracturing construction parameter optimization method comprises the following steps: acquiring geological parameters and construction parameters of fractured wells in a research area; calculating the initial crack height of the fracturing crack according to the geological parameters and the construction parameters; respectively increasing each geological parameter and each construction parameter by a preset percentage value; comparing the joint height change rate corresponding to each construction parameter; making a construction drawing board; acquiring geological parameters and construction parameters of a to-be-fractured interval of a to-be-fractured well in a research area; and obtaining the optimal construction parameters according to the position relation between the projection point position and the fold line. The invention has the beneficial effects that: when the technical scheme provided by the invention is applied, only one construction chart needs to be manufactured for one research area, and when the technical scheme is used specifically, constructors can quickly utilize the construction chart to optimize fracturing construction parameters, so that the requirements on the constructors are low, and the method is convenient to popularize and apply in a large range.
Description
Technical Field
The invention relates to the technical field of fracturing design construction, in particular to a fracturing construction parameter optimization method, fracturing construction parameter optimization equipment and a readable storage medium.
Background
Along with the continuous increase of the demand of global economic development on oil and gas resources and the continuous increase of the difficulty of exploration and development of conventional oil and gas resources, the proportion of unconventional oil and gas resources such as coal bed gas, compact sandstone gas, shale gas and the like in oil and gas supply is increasing day by dayThe increase, especially the characteristics of the compact sandstone gas of three-high (technical recoverable reserves, proven reserves and output) thereof occupy the leading advantages, the output of the compact sandstone gas in China is steadily increased in recent years, and the annual increment reaches 50 hundred million m3. Therefore, from the knowledge of geological laws and the technical aspect of exploration and development, the dense sandstone gas is more realistic than the shale gas in the next 10 years, and is an important source for taking over conventional oil and gas resources in the future.
According to the research of domestic scholars, the compact sandstone reservoir in China mostly has the deposition characteristic of a thin interbed. Such reservoirs are generally poor in physical properties and low in reservoir reserves, and hydraulic fracturing is often an important stimulation tool for such reservoirs. The thin interbed has small stress difference between the interlayer and the production layer due to the fact that the interlayer is usually thin and low in strength, and has small inhibition effect on vertical expansion of fractured cracks; sometimes, the oil layer is close to the water layer, and in the fracturing process, the height of the crack easily exceeds the oil layer to continue to extend, so that the water layer is communicated to cause water channeling, the water content of the oil-gas well is increased rapidly, and the fracturing measure is directly failed. The fracturing construction cost is big, under the condition that fracturing fails, can destroy the oil reservoir usually, causes huge economic loss, if can just can acquire reliable fracturing construction parameter before the construction, then the efficiency of oil gas development of very big improvement.
The existing fracturing construction parameter optimization method is a PKN model, a KGD model and a PENNY model, but the three models have various condition assumptions and need operators to know the fracturing construction process very much, so that a better construction parameter can be obtained only by performing targeted continuous adjustment in the models. Therefore, the requirements of field operators on optimization of fracturing construction parameters by using the three models are high, and the three models are difficult to popularize in a large range.
Disclosure of Invention
In view of the above, there is a need for a method, an apparatus and a readable storage medium for optimizing fracturing construction parameters, which are easy to operate.
The invention provides a method for optimizing fracturing construction parameters, which comprises the following steps:
acquiring geological parameters and construction parameters of a fractured well in a research area, wherein the geological parameters at least comprise Young modulus, target layer thickness, storage interlayer stress difference, interlayer thickness, Poisson's ratio, fracture toughness and fluid loss coefficient, and the construction parameters at least comprise total fluid volume, discharge capacity and fracturing fluid viscosity;
calculating the initial crack height of the fracturing crack according to the geological parameters and the construction parameters;
respectively increasing each geological parameter and each construction parameter by a preset percentage value, keeping other parameters unchanged, calculating the current seam height of a compression fracture, and respectively calculating the change rate of the seam height when each geological parameter and each construction parameter are independently increased by the preset percentage value according to the initial seam height and the current seam height;
comparing the seam height change rate corresponding to each construction parameter, and selecting two construction parameters with the largest seam height change rate absolute value;
comparing the seam height change rates corresponding to other geological parameters except the interlayer thickness and the interlayer stress difference, and selecting two geological parameters with the largest seam height change rate absolute value;
respectively taking a plurality of values for the two selected geological parameters and the two construction parameters to manufacture a construction chart;
acquiring geological parameters and construction parameters of a to-be-fractured interval of a to-be-fractured well in a research area, and casting points on the construction chart according to the geological parameters and the construction parameters of the to-be-fractured interval;
selecting a folding line matched with the interval to be fractured on the construction chart according to the geological parameters and the construction parameters of the interval to be fractured;
and judging the position relation between the projection point position and the fold line, and acquiring the optimal construction parameters according to the position relation between the projection point position and the fold line.
The invention also provides fracturing construction parameter optimization equipment, which comprises a processor and a memory;
the memory has stored thereon a computer readable program executable by the processor;
the processor, when executing the computer readable program, implements the steps in the method for optimizing fracturing construction parameters provided by the invention.
The present invention also provides a computer readable storage medium storing one or more programs, the one or more programs being executable by one or more processors to perform the steps in the method for fracture construction parameter optimization provided by the present invention.
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that: when the technical scheme provided by the invention is applied, only one construction chart needs to be manufactured for one research area, and when the technical scheme is used specifically, constructors can quickly utilize the construction chart to optimize fracturing construction parameters, so that the requirements on the constructors are low, and the method is convenient to popularize and apply in a large range.
Drawings
FIG. 1 is a flow diagram of one embodiment of a method for optimizing fracturing construction parameters provided by the present invention;
FIG. 2 is a flowchart of the steps of step S100 in FIG. 1;
FIG. 3 is a flowchart of the steps of step S200 in FIG. 1;
FIG. 4 is a histogram of the rate of change of the fracture height for individual geological parameters and individual construction parameters increased by 10% alone in an embodiment of the method for optimizing fracturing construction parameters provided by the present invention;
FIG. 5 is a construction layout of an embodiment of the method for optimizing fracturing construction parameters provided by the present invention;
FIG. 6 is a construction layout projection diagram of a well B in an embodiment of the method for optimizing fracturing construction parameters provided by the present invention;
fig. 7 is a fracture simulation result of a target fracturing section of a B well by means of fracture simulation software Meyer in an embodiment of the fracturing construction parameter optimization method provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 3, the present invention provides a method for optimizing fracturing construction parameters, comprising the following steps:
(1) s100: the construction plate manufacturing method specifically comprises the following steps:
s110: acquiring geological parameters and construction parameters of a fractured well in a research area, wherein the geological parameters at least comprise Young modulus, target layer thickness, storage interlayer stress difference, interlayer thickness, Poisson's ratio, fracture toughness and fluid loss coefficient, and the construction parameters at least comprise total fluid volume, discharge capacity and fracturing fluid viscosity;
s120: calculating the initial crack height of the fracturing crack according to the geological parameters and the construction parameters;
s130: respectively increasing each geological parameter and each construction parameter by a preset percentage value, keeping other parameters unchanged, calculating the current seam height of a compression fracture, and respectively calculating the change rate of the seam height when each geological parameter and each construction parameter are increased by a preset percentage value independently according to the initial seam height and the current seam height, wherein in the embodiment, the preset percentage value is 10%;
s140: comparing the seam height change rate corresponding to each construction parameter, and selecting two construction parameters with the largest seam height change rate absolute value;
s150: comparing the seam height change rates corresponding to other geological parameters except the interlayer thickness and the interlayer stress difference, and selecting two geological parameters with the largest seam height change rate absolute value;
s160: respectively taking a plurality of values for the two selected geological parameters and the two construction parameters to manufacture a construction chart, wherein the manufacturing method of the construction chart comprises the following steps: combining the two selected geological parameters and the values of the two construction parameters, and respectively drawing a line graph under each combination condition by taking the interlayer thickness as a horizontal axis and the stress difference of the storage interlayer as a vertical axis to form the construction chart;
(2) s200: the construction plate casting method specifically comprises the following steps:
s210: acquiring geological parameters and construction parameters of a to-be-fractured interval of a to-be-fractured well in a research area, and casting points on the construction chart according to the geological parameters and the construction parameters of the to-be-fractured interval;
s220: selecting a folding line matched with the interval to be fractured on the construction chart according to the geological parameters and the construction parameters of the interval to be fractured;
s230: judging the position relation between the projection point position and the fold line, and acquiring the optimal construction parameters according to the position relation between the projection point position and the fold line; the method for obtaining the optimal construction parameters according to the position relation between the projection point position and the fold line comprises the following steps: if the projection point is located below the broken line, the construction parameters are reasonable, if the projection point is located above the broken line, the fracturing is indicated to have a layer crossing phenomenon, and the projection point is projected again after the construction parameters are adjusted until the projection point falls below the broken line.
When the technical scheme provided by the invention is applied, only one construction chart needs to be manufactured for one research area, and when the technical scheme is used specifically, constructors can quickly utilize the construction chart to optimize fracturing construction parameters, so that the requirements on the constructors are low, and the method is convenient to popularize and apply in a large range.
Further, the height of the fracturing fracture is calculated through three-dimensional fracturing simulation software according to the geological parameters and the construction parameters. The three-dimensional fracturing simulation software is Meyer software which is widely used in the petroleum development industry.
Preferably, the number of the two construction parameters is less than 5, and the number of the two geological parameters is less than 5.
In order to verify the accuracy of the construction drawing manufactured by the method provided by the invention, east sections of Shaan slopes in northeast of east of Erdos basin and north sections of Yanxing blocks of west edges of the Jinxi flexure belts are taken as research areas, and the Taiyuan group, the Shanxi group of the two-fold system, the stone-carbon box group and the stone-lower box group are taken as target fracturing sections. And selecting the well A in the research area as a fractured well for manufacturing a construction chart, and selecting the well B in the research area as a well to be fractured for applying the construction chart.
1) Making construction plate
(1) Geological parameters and construction parameters of the fractured interval of the well A are collected, and are shown in the table 1:
table 1: geological parameters and construction parameters of well A
(2) Inputting each parameter in the table 1 into Meyer software, and calculating the initial crack height of the fracture;
(3) respectively increasing each geological parameter and each construction parameter by 10%, keeping other parameters unchanged, calculating the current seam height of the fracturing seam, respectively calculating the change rate of the seam height when each geological parameter and each construction parameter are increased by 10% independently according to the initial seam height and the current seam height, and showing the change rate of the seam height when each geological parameter and each construction parameter are increased by 10% independently in a figure 4;
(4) as can be seen from fig. 4, when three construction parameters (total fluid volume, displacement volume and viscosity of fracturing fluid) are increased by 10% alone, the change rates of the joint height are respectively: 10.76%, 5.83% and 4.45%, so the two construction parameters with the largest absolute value of the seam height change rate are the total liquid volume and the discharge volume;
(5) as can be seen from fig. 4, when six geological parameters (young's modulus, target layer thickness, storage interlayer stress difference, interlayer thickness, poisson's ratio, fracture toughness and fluid loss coefficient) are independently increased by 10%, the change rates of seam height are respectively: 14.50%, -6.62%, -9.95%, -6.7%, 2.49%, 1.59% and-0.90%, it can be seen that, of the other geological parameters except for the interlayer thickness and the storage interlayer stress difference, the two geological parameters with the largest absolute value of the seam height change rate are the Young modulus and the target layer thickness;
(6) in this embodiment, referring to table 2, the value taking conditions are as follows: young modulus is 17GPa, 24.5GPa and 32GPa respectively, target layer thickness is 8m, 10m, 20m and 30m respectively, and total liquid amount is determined by referring to the target layer thicknessThe total liquid amount of the inter-construction is 250m for 10-30 m3、450m3And 650m3150m for 8m3、300m3And 400m3The discharge capacity is 4m3Min and 5m3Combining the two selected geological parameters and the values of the two construction parameters, and respectively drawing a line graph under each combination condition by taking the interlayer thickness as a horizontal axis and the interlayer stress difference as a vertical axis to form a construction chart (see fig. 5);
table 2: list of values of parameters
2) The construction plate casting method specifically comprises the following steps:
(1) collecting geological parameters and construction parameters of a to-be-fractured interval of a to-be-fractured well B in a research area, wherein the geological parameters and the construction parameters are shown in a table 3;
table 3: geological parameters and construction parameters of well B
(2) According to the actual geology and construction condition of the well B, a target layer 20m in a plate is taken, and the discharge capacity is 5m3Min, total liquid volume 450m3Boundary curve of interlayer with Young's modulus of 24.5GPa and target layer of 10m and displacement of 5m3Min, total liquid volume 450m3And the Young modulus is 24.5GPa, points (9.4, 14.5) and (8.9, 13.8) formed by the thickness of the interlayer and the stress difference of the storage interlayer are projected on a corresponding chart, the projection result is shown in figure 6, the projections of the two points are both above the curve, and the phenomenon of pressure channeling can not occur under the construction condition according to the chart analysis.
FIG. 7 shows the fracturing simulation result of the target fracturing section of the well B through the fracturing simulation software Meyer, and the fracturing simulation result shows that the hydraulic fracture height is effectively controlled, the phenomenon of pressure channeling is avoided, and the method is consistent with the chart analysis result, so that the accuracy and the feasibility of the fracturing construction parameter optimization method provided by the invention are proved to be good.
It should be understood that although the various steps in the flowcharts of fig. 1-3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise.
The present invention also provides a computer readable storage medium storing one or more programs, the one or more programs being executable by one or more processors to perform the steps in the method for fracture construction parameter optimization provided by the present invention. Since the method for optimizing the fracturing construction parameters is described in detail above, the description is omitted here.
In conclusion, according to the technical scheme provided by the invention, only one construction chart needs to be manufactured for one research area when the method is applied, and when the method is used specifically, a constructor can quickly utilize the construction chart to optimize fracturing construction parameters, so that the requirement on the constructor is low, and the method is convenient to popularize and apply in a large range.
Of course, it will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program instructing relevant hardware (such as a processor, a controller, etc.), and the program may be stored in a computer readable storage medium, and when executed, the program may include the processes of the above method embodiments. The storage medium may be a memory, a magnetic disk, an optical disk, etc.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A method for optimizing fracturing construction parameters is characterized by comprising the following steps:
acquiring geological parameters and construction parameters of a fractured well in a research area, wherein the geological parameters at least comprise Young modulus, target layer thickness, storage interlayer stress difference, interlayer thickness, Poisson's ratio, fracture toughness and fluid loss coefficient, and the construction parameters at least comprise total fluid volume, discharge capacity and fracturing fluid viscosity;
calculating the initial crack height of the fracturing crack according to the geological parameters and the construction parameters;
respectively increasing each geological parameter and each construction parameter by a preset percentage value, keeping other parameters unchanged, calculating the current seam height of a compression fracture, and respectively calculating the change rate of the seam height when each geological parameter and each construction parameter are independently increased by the preset percentage value according to the initial seam height and the current seam height;
comparing the seam height change rate corresponding to each construction parameter, and selecting two construction parameters with the largest seam height change rate absolute value;
comparing the seam height change rates corresponding to other geological parameters except the interlayer thickness and the interlayer stress difference, and selecting two geological parameters with the largest seam height change rate absolute value;
respectively taking a plurality of values for the two selected geological parameters and the two construction parameters to manufacture a construction chart;
acquiring geological parameters and construction parameters of a to-be-fractured interval of a to-be-fractured well in a research area, and casting points on the construction chart according to the geological parameters and the construction parameters of the to-be-fractured interval;
selecting a folding line matched with the interval to be fractured on the construction chart according to the geological parameters and the construction parameters of the interval to be fractured;
and judging the position relation between the projection point position and the fold line, and acquiring the optimal construction parameters according to the position relation between the projection point position and the fold line.
2. The method for optimizing fracturing construction parameters of claim 1, wherein the preset percentage value is 10%.
3. The method for optimizing fracturing construction parameters of claim 1, wherein the method for making the construction chart comprises:
and combining the two selected geological parameters and the values of the two construction parameters, and respectively drawing a line graph under each combination condition by taking the interlayer thickness as a horizontal axis and the stress difference of the storage interlayer as a vertical axis to form the construction chart.
4. The method for optimizing fracturing construction parameters according to claim 1, wherein the method for obtaining the optimal construction parameters according to the position relation between the projection point position and the broken line comprises the following steps:
if the projection point is located below the broken line, the construction parameters are reasonable, if the projection point is located above the broken line, the fracturing is indicated to have a layer crossing phenomenon, and the projection point is projected again after the construction parameters are adjusted until the projection point falls below the broken line.
5. The method for optimizing fracturing construction parameters of claim 1, wherein the height of the fracture is calculated by three-dimensional fracturing simulation software according to the geological parameters and the construction parameters.
6. The method for fracture construction parameter optimization of claim 5, wherein the three-dimensional fracture simulation software is Meyer software.
7. The fracturing construction parameter optimization equipment is characterized by comprising a processor and a memory;
the memory has stored thereon a computer readable program executable by the processor;
the processor, when executing the computer readable program, performs the steps in the method for fracture construction parameter optimization of any of claims 1-6.
8. A computer readable storage medium storing one or more programs for execution by one or more processors to perform the steps of the method for fracture construction parameter optimization of any of claims 1-6.
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