CN108266182B

CN108266182B - Method and device for selecting fracture distribution mode of horizontal well staged fracturing

Info

Publication number: CN108266182B
Application number: CN201611265845.9A
Authority: CN
Inventors: 石善志; 于会永; 张奎; 李建民; 张传新; 孙正丽; 陈禹欣; 孙宜成; 田刚
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2016-12-30
Filing date: 2016-12-30
Publication date: 2021-08-31
Anticipated expiration: 2036-12-30
Also published as: CN108266182A

Abstract

The invention discloses a method and a device for selecting a fracture arrangement mode of horizontal well staged fracturing. The method comprises the following steps: acquiring a possibility value for forming the complex seam network and a demand value for the complex seam network; determining a possibility value for forming the complex seam network and a target area to which corresponding position information of a demand value for the complex seam network on a mode selection plate belongs, wherein different areas on the mode selection plate are used for quantitatively representing a preset number of seam distribution modes; and selecting a target fracture arrangement mode of the staged fracturing of the horizontal well from the preset number of fracture arrangement modes according to the target area. By the method, the effect that the rationality of reservoir transformation is higher due to the selection of the staged fracturing fracture setting mode of the horizontal well is achieved.

Description

Method and device for selecting fracture distribution mode of horizontal well staged fracturing

Technical Field

The invention relates to the field of petroleum development, in particular to a method and a device for selecting a fracture arrangement mode of horizontal well staged fracturing.

Background

At present, the staged fracturing technology of the horizontal well becomes an unconventional and effective development main technology in a low-permeability oil and gas reservoir, and the crack distribution mode selection of staged fracturing of the horizontal well is a key for influencing whether the reservoir can be economically and reasonably reformed.

Different conditions are selected in the process of the fracture arrangement mode of the horizontal well staged fracturing. For example, the selection of the fracture arrangement mode is too conservative, so that the reservoir transformation is insufficient, and the reservoir crude oil cannot be fully utilized; for another example, the selection of the fracture setting mode is too aggressive, so that the reservoir reconstruction is excessive, and the cost of the reservoir reconstruction is too high.

In recent years, some researches on the selection of fracture arrangement modes of horizontal well staged fracturing are carried out at home and abroad, some knowledge is obtained, but no quantitative fracture arrangement mode selection chart is formed. Because two key factors influencing the staged fracturing seam distribution mode selection of the horizontal well are not quantitatively considered, namely the possibility of forming the complex seam network and the demand on the complex seam network, the staged fracturing seam distribution mode selection of the horizontal well is fuzzy, and the result reliability is low.

With the large-scale application of the horizontal well staged fracturing technology in the development of unconventional and low-permeability oil and gas reservoirs, a set of fracture arrangement pattern plate with compact theory and sufficient practice is urgently needed to be developed to indicate the selection of the fracture arrangement mode of the horizontal well staged fracturing, so that a theoretical basis is provided for reasonably designing the fracture arrangement mode.

Aiming at the problem that the rationality of reservoir transformation is low due to the selection of a horizontal well staged fracturing fracture arrangement mode in the prior art, an effective solution is not provided at present.

Disclosure of Invention

The invention mainly aims to provide a method and a device for selecting a fracture setting mode of staged fracturing of a horizontal well, so as to at least solve the problem that the rationality of reservoir transformation is low due to selection of the staged fracturing fracture setting mode of the horizontal well in the prior art.

In order to achieve the above object, according to one aspect of the present invention, a method for selecting a fracture setting pattern of horizontal well staged fracturing is provided. The method comprises the following steps: acquiring a possibility value for forming the complex seam network and a demand value for the complex seam network; determining a possibility value for forming the complex seam network and a target area to which corresponding position information of a demand value for the complex seam network on a mode selection plate belongs, wherein different areas on the mode selection plate are used for quantitatively representing a preset number of seam distribution modes; and selecting a target fracture arrangement mode of the staged fracturing of the horizontal well from the preset number of fracture arrangement modes according to the target area.

Further, before determining a target area to which corresponding position information of a possibility value for forming the complex seam network and a demand value for the complex seam network on the mode selection plate belongs, determining a first variable corresponding to the possibility value for forming the complex seam network as an abscissa axis of a preset coordinate system; determining a second variable corresponding to the demand value of the complex seam net as a vertical axis of a preset coordinate system; combining the position information of the first variable on the abscissa axis and the position information of the second variable on the ordinate axis into regions with a preset number on a preset coordinate system, wherein the regions with the preset number correspond to the crack distribution modes with the preset number one by one; and generating a mode selection plate according to the preset number of regions.

Further, obtaining a likelihood value for forming the complex seam web and a desirability value for the complex seam web comprises: determining a first formation parameter for affecting the likelihood of forming the complex seam network and a second formation parameter for affecting desirability of the complex seam network; carrying out quantization processing on the first stratum parameters to obtain a possibility value of forming a complex seam network; and carrying out quantization processing on the second stratum parameters to obtain a demand value for the complex seam network.

Further, the quantifying the first formation parameter to obtain the probability value of forming the complex fracture network includes: and carrying out quantization processing on the first stratum parameters according to the comprehensive fuzzy evaluation rule to obtain a possibility value of forming the complex seam network.

Further, the first formation parameters include a two-way stress difference parameter, a natural fracture development degree parameter and a rock brittleness parameter, and the first formation parameters are subjected to quantization processing according to a comprehensive fuzzy evaluation rule, so that the possibility value of forming the complex fracture network is obtained, and the possibility value comprises: respectively acquiring a numerical value of a two-directional stress difference parameter, a numerical value of a natural crack development degree parameter and a numerical value of a rock brittleness parameter; acquiring a first score of the influence degree of a numerical value used for expressing a two-way stress difference parameter on the possibility of forming the complex seam network; acquiring a second score of the influence degree of the numerical value used for expressing the natural fracture development degree parameter on the possibility of forming the complex fracture network; acquiring a third fraction of the influence degree of the numerical value for representing the rock brittleness parameter on the possibility of forming the complex seam network; and acquiring a probability value for forming the complex fracture network according to the first score, the first weight and the second score corresponding to the two-way stress difference parameter, the second weight and the third weight corresponding to the natural fracture development degree parameter, and the third weight corresponding to the rock brittleness parameter, wherein the sum of the first weight, the second weight and the third weight is 1.0.

Further, obtaining a second score representing a degree of influence of a value of the natural fracture development parameter on the likelihood of forming the complex fracture network comprises: classifying the numerical values of the natural fracture development degree parameters to obtain a first classification, a second classification and a third classification, wherein the numerical value of the natural fracture development degree parameter corresponding to the first classification is higher than the numerical value of the natural fracture development degree parameter corresponding to the second classification, and the numerical value of the natural fracture development degree parameter corresponding to the second classification is higher than the numerical value of the natural fracture development degree parameter corresponding to the third classification; and respectively acquiring second scores of the influence degree of the numerical values of the natural fracture development degree parameters corresponding to the first classification, the second classification and the third classification on the possibility of forming the complex fracture network.

Further, classifying the values of the natural fracture development degree parameters to obtain a first classification, a second classification and a third classification, wherein the first classification, the second classification and the third classification comprise: and classifying the numerical values of the natural fracture development degree parameters according to the density values of the natural fractures to obtain a first classification, a second classification and a third classification.

Further, classifying the numerical value of the natural fracture development degree parameter according to the density value of the natural fracture to obtain a first classification, a second classification and a third classification, wherein the first classification, the second classification and the third classification comprise: and classifying the numerical values of the natural fracture development degree parameters according to the linear density of the natural fractures, the area density of the natural fractures or the bulk density of the natural fractures to obtain a first classification, a second classification and a third classification.

Further, the two-way stress difference parameter is used for representing the difference between the maximum level principal stress and the minimum level principal stress of the reservoir; the rock brittleness parameter is used for representing a rock brittleness index determined when rock mineral content analysis is carried out on a reservoir rock sample.

Further, the second formation parameter includes formation crude oil fluidity, and the second formation parameter is subjected to quantization processing to obtain a desirability value of the complex seam network, including: acquiring a numerical value of the formation crude oil fluidity; and determining the numerical value of the formation crude oil fluidity as a value of the complex seam network demand.

Further, the preset number of crack distribution modes includes: a conventional segmentation region determined by a first preset number of boundary points; the subdivision cutting area is determined by a second preset number of boundary points; a complex mesh sewing area determined by a third preset number of boundary points; a multi-branch seam region determined by a fourth preset number of boundary points; a subdivided cut or multi-branch slit region defined by a fifth predetermined number of boundary points.

In order to achieve the above object, according to another aspect of the present invention, there is also provided a device for selecting a fracture setting mode of horizontal well staged fracturing. The device for selecting the fracture arrangement mode of the horizontal well staged fracturing comprises: the acquiring unit is used for acquiring a possibility value for forming the complex seam network and a demand value for the complex seam network; the device comprises a first determining unit, a second determining unit and a control unit, wherein the first determining unit is used for determining a probability value for forming the complex seam network and a target area to which corresponding position information of a demand value for the complex seam network on a mode selection plate belongs, and different areas on the mode selection plate are used for quantitatively representing a preset number of crack seam distribution modes; and the selecting unit is used for selecting a target fracture arrangement mode of the staged fracturing of the horizontal well from the preset number of fracture arrangement modes according to the target area.

Further, the apparatus further comprises: the second determining unit is used for determining a first variable corresponding to the possibility value of forming the complex sewing net as an abscissa axis of a preset coordinate system before determining a target area to which the position information corresponding to the possibility value of forming the complex sewing net and the demand value for the complex sewing net on the mode selection plate belongs; the third determining unit is used for determining a second variable corresponding to the demand value of the complex seam network as the ordinate axis of the preset coordinate system; the combination unit is used for combining the position information of the first variable on the abscissa axis and the position information of the second variable on the ordinate axis into regions with preset number on a preset coordinate system, wherein the regions with the preset number correspond to the crack distribution patterns with the preset number one by one; and the generating unit is used for generating the mode selection plate according to the preset number of the areas.

According to the invention, the possibility value of forming the complex seam net and the demand value of the complex seam net are obtained; determining a possibility value for forming the complex seam network and a target area to which corresponding position information of a demand value for the complex seam network on a mode selection plate belongs, wherein different areas on the mode selection plate are used for quantitatively representing a preset number of seam distribution modes; the method comprises the steps of selecting a target fracture arrangement mode of horizontal well staged fracturing from preset number of fracture arrangement modes according to a target area, obtaining a possibility value for forming a complex fracture network and a demand value for the complex fracture network based on quantitative indexes, and selecting the fracture arrangement mode on a mode selection chart of the horizontal well staged fracturing fracture arrangement mode according to the possibility value for forming the complex fracture network and the demand value for the complex fracture network, so that the problem that the rationality of reservoir reconstruction is low due to selection of the horizontal well staged fracturing fracture arrangement mode in the prior art can be effectively solved, and the effect that the rationality of reservoir reconstruction is higher due to selection of the horizontal well staged fracturing fracture arrangement mode is achieved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a flow chart of a method for selecting a fracture pattern for horizontal well staged fracturing in accordance with an embodiment of the present invention;

FIG. 2 is a flow chart of another method for selecting a fracture pattern for horizontal well staged fracturing in accordance with an embodiment of the present invention;

FIG. 3 is a schematic illustration of a fracture placement pattern selection plate for horizontal well staged fracturing in accordance with an embodiment of the present invention;

FIG. 4 is a schematic diagram of a fracture placement mode selection plate for horizontal well staged fracturing with control points according to an embodiment of the invention;

FIG. 5 is a schematic illustration of another horizontal well staged fracturing fracture placement pattern selection template according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of the fracture and fissure pattern selection result of the horizontal well staged fracturing of a Baikou spring group reservoir of a Mahu oil field Ma 131 well zone according to the embodiment of the invention;

FIG. 7 is a schematic diagram of the fracture placement mode selection result of horizontal well staged fracturing of a Jinlong oilfield Jinlong 10-well carbone system reservoir according to an embodiment of the present invention; and

fig. 8 is a schematic diagram of a fracture setting pattern selection device for horizontal well staged fracturing according to an embodiment of the invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Example 1

The embodiment of the invention provides a method for selecting a fracture arrangement mode of horizontal well staged fracturing.

Fig. 1 is a flowchart of a method for selecting a fracture setting mode of horizontal well staged fracturing according to an embodiment of the invention. As shown in fig. 1, the method comprises the steps of:

and step S102, acquiring a possibility value for forming the complex seam network and a demand value for the complex seam network.

In the above step S102 of the present invention, a possibility value for forming a complex seam network and a desirability value for the complex seam network are obtained.

The key parameters influencing the selection of the fracture setting mode of the horizontal well staged fracturing are a possibility value of forming a complex fracture network and a demand value of the complex fracture network. The probability value is the probability of occurrence of the object, is a quantitative index which is contained in the object and predicts the development trend of the object, and obtains the probability value of forming the complex seam network. The desirability value is a quantitative index which is contained in the object and represents the requirement of the object, and the desirability value of the complex seam network is obtained. Optionally, the formation crude oil fluidity is quantified, and the smaller the formation crude oil fluidity is, the greater the demand for the complex seam network is, and conversely, the greater the formation crude oil fluidity is, the smaller the demand for the complex seam network is.

Optionally, an actual oil reservoir is obtained, and a probability value of forming the complex seam network and a desirability value of the complex seam network are calculated according to the actual oil reservoir.

When a possibility value for forming the complex seam network is obtained, determining key stratum parameters influencing the possibility of forming the complex seam network, wherein the key stratum parameters comprise a bidirectional stress difference, a natural crack development degree and a rock brittleness index, quantitatively evaluating the possibility of forming the complex seam network to obtain a numerical value of the possibility of forming the complex seam network, namely the possibility value of the complex seam network, and taking the possibility value of the complex seam network as a quantitative index of the possibility of forming the complex seam network.

When a demand value for the complex seam network is obtained, determining a key stratum parameter influencing the demand for the complex seam network, wherein the key stratum parameter can be stratum crude oil fluidity, and taking the numerical value of the stratum crude oil fluidity as a numerical value of the demand for the complex seam network, namely, the demand value for the complex seam network and the demand value for the complex seam network as a quantitative index of the demand for the complex seam network.

And step S104, determining a target area to which the position information corresponding to the possibility value for forming the complex seam network and the demand value for the complex seam network on the mode selection plate belongs.

In the technical solution provided in step S104 of the present invention, a target region to which corresponding position information on a mode selection plate corresponds is determined, where a possibility value for forming a complex seam network and a desirability value for the complex seam network belong, and different regions on the mode selection plate are used for performing quantitative representation on a preset number of seam laying modes.

The mode selection plate is a horizontal well staged fracturing crack distribution mode selection plate which quantitatively considers the possibility of forming a complex crack net and the demand of the complex crack net. Optionally, the mode selection plate comprises: establishing a two-dimensional rectangular coordinate system, wherein the abscissa is a possibility variable for forming a complex seam network, the abscissa can be in a unit, the ordinate is a demand variable for the complex seam network, the ordinate can be in a unit of mD/mPa · s, and the two-dimensional rectangular coordinate system is calibrated into regions with preset number according to the data of the demand variable for the complex seam network and the possibility variable for forming the complex seam network in the two-dimensional coordinate system, and the regions with preset number can be: a conventional segmentation area, a subdivision cutting area, a complex stitched web area, a multi-branch stitched area, a subdivision cutting or a multi-branch stitched area.

After the possibility value for forming the complex seam network and the demand value for the complex seam network are obtained, the target area to which the corresponding position information of the possibility value for forming the complex seam network and the demand value for the complex seam network on the mode selection plate belongs is determined, and the possibility value for forming the complex seam network and the demand value for the complex seam network can be calibrated on the mode selection plate.

Optionally, the possibility value for forming the complex seam network and the desirability value for the complex seam network may fall into a conventional segmentation region in the mode selection plate, and then the target region is a conventional segmentation region; the possibility value for forming the complex sewing net and the demand value for the complex sewing net can fall in the subdivision cutting area, and the target area is the subdivision cutting area; the probability value for forming the complex seam network and the value of the demand for the complex seam network can fall in a complex seam network region, then the target region is a multi-branch seam region, the probability value for forming the complex seam network and the value of the demand for the complex seam network can fall in a subdivision cutting or multi-branch seam region, and then the target region is a subdivision cutting or multi-branch seam region.

And S106, selecting a target fracture arrangement mode of the staged fracturing of the horizontal well from the preset number of fracture arrangement modes according to the target area.

In the technical scheme provided by the step S106 of the present invention, a target fracture arrangement mode for staged fracturing of a horizontal well is selected from a preset number of fracture arrangement modes according to a target zone.

And after determining a target area to which corresponding position information of the possibility value for forming the complex fracture network and the demand value for the complex fracture network on the mode selection plate belongs, selecting a target fracture setting mode for staged fracturing of the horizontal well from the fracture setting modes with preset numbers according to the target area. Optionally, if the possibility value of forming the complex seam network and the demand value of the complex seam network fall in a conventional segmentation area, the horizontal well seam arrangement design is performed by adopting a conventional seam arrangement mode; if the possibility value of forming the complex seam network and the demand value of the complex seam network fall in the subdivision cutting area, the horizontal well seam arrangement design is performed by adopting a subdivision cutting seam arrangement mode; if the possibility of forming the complex seam net and the requirement value of the complex seam net fall in the complex seam net area, indicating that the horizontal well seam arrangement design is carried out by adopting a complex seam net cloth seam mode; if the possibility value of forming the complex seam network and the demand value of the complex seam network fall in a multi-branch seam region, indicating that a multi-branch seam laying mode is adopted to carry out horizontal well seam laying design; if the possibility value of forming the complex seam network and the demand value of the complex seam network fall in a subdivision cutting or multi-branch seam region, the horizontal well seam arrangement design is performed by adopting a subdivision cutting or multi-branch seam arrangement mode, and then the selected seam arrangement mode is well matched with the geological characteristics of the oil reservoir.

Therefore, the probability value of the complex seam network formed by the actual oil reservoir and the region in which the demand value of the complex seam network falls are selected which fracture distribution mode is well matched with the oil reservoir, therefore, a reasonable crack arrangement mode is selected according to the probability value of the complex fracture network and the position of the demand value of the complex fracture network on the mode selection plate, the staged fracturing crack mode selection of the horizontal well can be conveniently and quickly realized, due to the fact that two key factors influencing the horizontal well staged fracturing seam distribution mode selection are quantitatively considered, the possibility of forming the complex seam network and the demand for the complex seam network, clear basis is provided for the horizontal well staged fracturing seam distribution mode selection, the use is convenient and fast, the result reliability is high, and the effect that the rationality of reservoir reconstruction is higher due to the selection of the horizontal well staged fracturing seam distribution mode is achieved.

The method comprises the steps of acquiring a possibility value for forming the complex seam network and a demand value for the complex seam network; determining a possibility value for forming the complex seam network and a target area to which corresponding position information of a demand value for the complex seam network on a mode selection plate belongs, wherein different areas on the mode selection plate are used for quantitatively representing a preset number of seam distribution modes; according to the method, the target fracture arrangement mode of the horizontal well staged fracturing is selected from the preset number of fracture arrangement modes according to the target area, and due to the possibility of a complex fracture network formed based on quantitative indexes and the selection chart of the horizontal well staged fracturing fracture arrangement mode and the selection method of the fracture arrangement mode, the problem that the rationality of reservoir reconstruction is low due to the selection of the horizontal well staged fracturing fracture arrangement mode in the prior art can be effectively solved, and the effect that the rationality of reservoir reconstruction is high due to the selection of the horizontal well staged fracturing fracture arrangement mode is achieved.

As an optional implementation manner, before determining a target region to which corresponding position information on the mode selection plate belongs, the possibility value of forming the complex seam network and the desirability value of the complex seam network, the method further includes: determining a first variable corresponding to the possibility value of forming the complex seam network as an abscissa axis of a preset coordinate system; determining a second variable corresponding to the demand value of the complex seam net as a vertical axis of a preset coordinate system; combining the position information of the first variable on the abscissa axis and the position information of the second variable on the ordinate axis into regions with a preset number on a preset coordinate system, wherein the regions with the preset number correspond to the crack distribution modes with the preset number one by one; and generating a mode selection plate according to the preset number of regions.

Generating a horizontal well staged fracturing fracture arrangement mode selection plate before determining a target area to which corresponding position information on a possibility value for forming a complex fracture network and a demand value for the complex fracture network belongs on the mode selection plate, wherein the generation flow of the mode selection plate comprises the following steps: determining two key parameters influencing the staged fracturing fracture arrangement mode selection of a horizontal well, namely the possibility of forming a complex fracture network and the requirement on the complex fracture network, when a preset coordinate system is a two-dimensional coordinate system, determining a first variable corresponding to the possibility value of forming the complex fracture network as an abscissa axis of the preset coordinate system, wherein the first variable is a possibility variable of forming the complex fracture network, the possibility value of forming the complex fracture network is an abscissa value, the abscissa unit can be percent, determining a second variable corresponding to the requirement value of the complex fracture network as an ordinate axis of the preset coordinate system, the second variable is a requirement variable of the complex fracture network, the requirement value of the complex fracture network is an ordinate value, and the ordinate unit can be mD/mPa.

Combining the position information of the first variable on the abscissa axis and the position information of the second variable on the ordinate axis into regions with preset number on a preset coordinate system, wherein the regions with the preset number correspond to the crack distribution patterns with the preset number one by one, so that the possibility of forming the complex seam network and the requirement on the complex seam network are combined differently on a two-dimensional coordinate system. Optionally, each possibility of forming a complex stitched web, in combination with the desirability of complex stitched webs, selects a suitable stitching pattern to form five regions, respectively a conventional segmentation region, a subdivided cutting region, a complex stitched web region, a multi-branch stitched region, a subdivided cutting or a multi-branch stitched region. After the position information corresponding to the first variable on the abscissa axis and the position information corresponding to the second variable on the ordinate axis are combined into the preset number of regions on the preset coordinate system, the mode selection plate is generated according to the preset number of regions.

Optionally, each of the regions is a region boundary controlled by a main control point, and the boundary line of each region is determined by a preset number of boundary points, so as to generate a reliable crack distribution pattern selection plate.

The mode selection chart of the embodiment has high reliability, two key indexes which influence the selection of the seam distribution mode, namely the requirement on the complex seam network and the possibility of forming the complex seam network are fully considered, so that the selected seam distribution mode is well matched with the geological characteristics of the oil reservoir, and the development benefit of the oil field is improved.

As an alternative embodiment, obtaining the likelihood value of forming the complex slotted net and the desirability value for the complex slotted net includes: determining a first formation parameter for affecting the likelihood of forming the complex seam network and a second formation parameter for affecting desirability of the complex seam network; carrying out quantization processing on the first stratum parameters to obtain a possibility value of forming a complex seam network; and carrying out quantization processing on the second stratum parameters to obtain a demand value for the complex seam network.

When a possibility value for forming the complex seam network and a demand value for the complex seam network are obtained, determining first stratum parameters influencing the possibility of forming the complex seam network, wherein the first stratum parameters can comprise two-way stress difference, natural fracture development degree and rock brittleness index. A second formation parameter affecting desirability of the complex seam network is determined, and the second formation parameter may be formation crude oil fluidity. After the first formation parameter is determined, the first formation parameter is quantized to obtain a possibility value of forming the complex seam network, and the possibility value of forming the complex seam network is used as a quantization index of the possibility of forming the complex seam network. After the second stratum parameter is determined, the second stratum parameter is quantized to obtain a demand value for the complex seam network, the demand value for the complex seam network is used as a quantization index of the demand for the complex seam network, optionally, the demand value for the complex seam network is a numerical value of the stratum crude oil fluidity, and the numerical value of the stratum crude oil fluidity is used as a quantization index of the demand for the complex seam network.

After the first stratum parameter is subjected to quantization processing to obtain a possibility value for forming a complex seam network, the second stratum parameter is subjected to quantization processing to obtain a demand value for the complex seam network, a target area falling in a two-dimensional coordinate system is determined according to the demand value of an actual oil reservoir for the complex seam network and the possibility value for forming the complex seam network, and then a fracture seam distribution mode to be adopted by the oil reservoir is determined according to the target area, so that the effect that the rationality of reservoir reconstruction is higher due to the selection of the staged fracturing fracture seam distribution mode of the horizontal well is achieved.

As an alternative embodiment, the quantifying the first formation parameter to obtain the probability value of forming the complex fracture network includes: and carrying out quantization processing on the first stratum parameters according to the comprehensive fuzzy evaluation rule to obtain a possibility value of forming the complex seam network.

When the first formation parameter is subjected to quantization processing to obtain a possibility value of forming the complex seam network, the possibility of forming the complex seam network can be quantitatively evaluated by adopting a comprehensive fuzzy evaluation rule to obtain a numerical value of the possibility of forming the complex seam network, and the numerical value of the possibility of forming the complex seam network is used as a quantization index of the possibility of forming the complex seam network.

As an optional implementation manner, the first formation parameter includes a two-way stress difference parameter, a natural fracture development degree parameter, and a rock brittleness parameter, and the obtaining of the probability value for forming the complex fracture network by performing quantization processing on the first formation parameter according to the comprehensive fuzzy evaluation rule includes: respectively acquiring a numerical value of a two-directional stress difference parameter, a numerical value of a natural crack development degree parameter and a numerical value of a rock brittleness parameter; acquiring a first score of the influence degree of a numerical value used for expressing a two-way stress difference parameter on the possibility of forming the complex seam network; acquiring a second score of the influence degree of the numerical value used for expressing the natural fracture development degree parameter on the possibility of forming the complex fracture network; acquiring a third fraction of the influence degree of the numerical value for representing the rock brittleness parameter on the possibility of forming the complex seam network; and acquiring a probability value for forming the complex fracture network according to the first score, the first weight and the second score corresponding to the two-way stress difference parameter, the second weight and the third weight corresponding to the natural fracture development degree parameter, and the third weight corresponding to the rock brittleness parameter, wherein the sum of the first weight, the second weight and the third weight is 1.0.

The first formation parameters include a two-way stress difference parameter, a natural fracture development degree parameter and a rock brittleness parameter. The two-way stress difference parameter refers to the difference between the maximum level main stress and the minimum level main stress of the reservoir. The natural fracture development degree parameter is divided according to high, medium and low, and the rock brittleness parameter refers to a rock brittleness index when rock mineral content test analysis is carried out on a reservoir rock sample. When the first stratum parameter is subjected to quantization processing according to the comprehensive fuzzy evaluation rule to obtain the possibility value of forming the complex seam network, specific values of key stratum parameters influencing the possibility of forming the complex seam network are respectively obtained, for example, a value of a two-way stress difference parameter, a value of a natural fracture development degree parameter and a value of a rock brittleness index parameter are obtained. And obtaining a first score of the influence degree of the numerical value used for expressing the parameters of the two-way stress difference on the possibility of forming the complex seam network, namely, scoring the two-way stress difference, namely, correspondingly scoring the influence degree of the possibility of forming the complex seam network under different two-way stress difference ranges, wherein the total score is a percentage. And obtaining a second score of the influence degree of the numerical value used for expressing the natural fracture development degree parameter on the complex fracture network forming possibility, namely, scoring the natural fracture development degree, classifying the natural fracture development degree according to high, medium and low, and correspondingly scoring the influence degree of the complex fracture network forming possibility under different natural fracture development degrees to obtain the second score, wherein the total score is a percentage. And obtaining a third score of the influence degree of the numerical value for expressing the rock brittleness parameter on the complex seam network forming possibility, namely scoring the brittleness index, namely correspondingly scoring the influence degree of the complex seam network forming possibility in different brittleness index ranges to obtain the third score, wherein the total score is a percentage.

And respectively giving certain weight to the two-way stress difference parameter, the natural crack development degree parameter and the rock brittleness parameter, wherein the sum of the three weights is equal to 1.0. The two-direction stress difference parameter corresponds to a first weight, the natural fracture development degree parameter corresponds to a second weight, the rock brittleness parameter corresponds to a third weight, and the sum of the first weight, the second weight and the third weight is 1.0. And acquiring a possibility value for forming the complex seam network according to the first score and the first weight, the second score and the second weight, and the third score and the third weight.

Optionally, the probability value (%) of forming the complex fracture network is equal to a first score multiplied by a first weight, a second score multiplied by a second weight, a third score multiplied by a third weight, so that the purpose of carrying out quantitative processing on the first formation parameter according to the comprehensive fuzzy evaluation rule to obtain the probability value of forming the complex fracture network is achieved, and the effect of enabling the rationality of reservoir transformation to be higher by selecting the staged fracturing fracture setting mode of the horizontal well is achieved.

As an alternative embodiment, obtaining a second score representing the degree of influence of the value of the parameter of the degree of natural fracture development on the likelihood of forming the complex fracture network comprises: classifying the numerical values of the natural fracture development degree parameters to obtain a first classification, a second classification and a third classification, wherein the numerical value of the natural fracture development degree parameter corresponding to the first classification is higher than the numerical value of the natural fracture development degree parameter corresponding to the second classification, and the numerical value of the natural fracture development degree parameter corresponding to the second classification is higher than the numerical value of the natural fracture development degree parameter corresponding to the third classification; and respectively acquiring second scores of the influence degree of the numerical values of the natural fracture development degree parameters corresponding to the first classification, the second classification and the third classification on the possibility of forming the complex fracture network.

When a second score for representing the influence degree of the numerical value of the natural fracture development degree parameter on the complex seam network forming possibility is obtained, classifying the natural fracture development degree according to high, medium and low judgment bases to respectively obtain a first classification, a second classification and a third classification, obtaining a second score of the influence degree of the numerical value of the natural fracture development degree parameter corresponding to the first classification on the complex seam network forming possibility, obtaining a second score of the influence degree of the numerical value of the natural fracture development degree parameter corresponding to the second classification on the complex seam network forming possibility, obtaining a second score of the influence degree of the numerical value of the natural fracture development degree parameter corresponding to the third classification on the complex seam network forming possibility, correspondingly scoring the influence degree of the complex seam network forming possibility under different natural fracture development degrees to obtain a second score, wherein, the total content is in percent.

As an alternative embodiment, classifying the numerical value of the natural fracture development degree parameter to obtain a first classification, a second classification and a third classification includes: and classifying the numerical values of the natural fracture development degree parameters according to the density values of the natural fractures to obtain a first classification, a second classification and a third classification.

The judgment of the high, medium and low natural fracture development degree is based on the density value of the natural fracture, and the numerical value of the natural fracture development degree parameter is classified according to the density value of the natural fracture to obtain a first classification, a second classification and a third classification.

As an alternative embodiment, classifying the numerical value of the natural fracture development degree parameter according to the density value of the natural fracture, and obtaining the first classification, the second classification and the third classification includes: and classifying the numerical values of the natural fracture development degree parameters according to the linear density of the natural fractures, the area density of the natural fractures or the bulk density of the natural fractures to obtain a first classification, a second classification and a third classification.

The density value of the natural fracture includes a numerical value of a linear density, an areal density, or a bulk density of the natural fracture. And classifying the numerical values of the natural fracture development degree parameters according to the numerical values of the linear density, the surface density or the bulk density of the natural fracture to obtain a first classification, a second classification and a third classification.

As an alternative embodiment, the two-way stress difference parameter is used to represent the difference between the maximum level principal stress and the minimum level principal stress of the reservoir; the rock brittleness parameter is used for representing a rock brittleness index determined when rock mineral content analysis is carried out on a reservoir rock sample.

As an alternative embodiment, the second formation parameter includes formation crude oil fluidity, and the quantifying the second formation parameter to obtain the desirability value of the complex seam network includes: acquiring a numerical value of the formation crude oil fluidity; and determining the numerical value of the formation crude oil fluidity as a value of the complex seam network demand.

And when the second stratum parameter is subjected to quantitative processing to obtain a value of the complex seam network demand, determining a key parameter influencing the complex seam network demand, wherein the key parameter can be the stratum crude oil fluidity, and the numerical value of the stratum crude oil fluidity is used as a quantitative index of the complex seam network demand.

As an alternative embodiment, the predetermined number of seam distribution patterns includes: a conventional segmentation region determined by a first preset number of boundary points; the subdivision cutting area is determined by a second preset number of boundary points; a complex mesh sewing area determined by a third preset number of boundary points; a multi-branch seam region determined by a fourth preset number of boundary points; a subdivided cut or multi-branch slit region defined by a fifth predetermined number of boundary points.

The crack seam distribution pattern on the pattern selection plate comprises a conventional segmentation area, a subdivision cutting area, a complex seam net area, a multi-branch seam area, a subdivision cutting area or a multi-branch area. The conventional segmentation area is defined by a first preset number of boundary points, the subdivision cutting area is defined by a second preset number of boundary points, the complex sewing area is defined by a third preset number of boundary points, the multi-branch sewing area is defined by a fourth preset number of boundary points, and the subdivision cutting or multi-branch sewing area is defined by a fifth preset number of boundary points.

For example, each of the regions is a boundary of a region controlled by a main control point, and the boundary line of the conventional segmented region is determined by a preset number of boundary points, for example, five boundary points are respectively 1 point, 2 points, 3 points, 4 points, and 5 points, and the five points are connected in sequence, wherein the 3 points and the 4 points are connected by a straight line or a curve, and other points are connected by a straight line; the subdivided cutting area boundary line is determined by five boundary points: the points are respectively 5 points, 4 points, 6 points, 7 points and 8 points, and the five points are sequentially connected through a straight line; the complex slotted-net area boundary line is determined by five boundary points: the points are respectively 7 points, 6 points, 9 points, 10 points and 11 points, and the five points are sequentially connected, wherein the 6 points and the 9 points are connected through a straight line or a curve, and other points are connected through a straight line; the multi-branch seam region boundary line is determined by five boundary points: the horizontal well staged fracturing fracture arrangement mode selection plate comprises 2 points, 3 points, 9 points, 10 points and 12 points which are sequentially connected through straight lines, so that the purpose of generating the horizontal well staged fracturing fracture arrangement mode selection plate is achieved before determining a possibility value for forming a complex fracture network and a target area to which corresponding position information of a demand value for the complex fracture network on the mode selection plate belongs.

The mode selection plate of the embodiment has high reliability, two key indexes which influence the crack distribution mode selection, namely the requirement on the complex crack network and the possibility of forming the complex crack network, are fully considered, so that the selected crack distribution mode is well matched with the geological characteristics of an oil reservoir, the development benefit of an oil field is improved, and the crack distribution mode selection method of the horizontal well can conveniently and quickly realize the staged fracturing crack mode selection of the horizontal well.

From the above, the seam distribution mode selection plate provided by the embodiment of the invention selects from five seam distribution modes according to the quantized possibility value for forming the complex seam network and the demand value for the complex seam network, so that the defect of selection depending on experience in the conventional selection of the seam distribution mode is avoided, the problem of insufficient or excessive modification of an oil reservoir due to improper selection of the seam distribution mode can be avoided, the selected seam distribution mode is well matched with the geological characteristics of the oil reservoir, and the oil reservoir fracturing modification effect is improved.

Example 2

The technical solution of the present invention will be described below with reference to a preferred embodiment.

Fig. 2 is a flow chart of another method for selecting a fracture pattern for horizontal well staged fracturing in accordance with an embodiment of the present invention. As shown in fig. 2, the method for selecting the fracture setting mode of the horizontal well staged fracturing comprises the following steps:

step S201, obtaining specific values of key stratum parameters influencing the possibility of forming the complex seam network.

And acquiring specific values of key stratum parameters influencing the possibility of forming the complex fracture network, wherein the key stratum parameters comprise specific values of two-way stress difference, natural fracture development degree and rock brittleness index. The two-direction stress difference refers to the difference between the maximum horizontal principal stress and the minimum horizontal principal stress of the reservoir, the judgment basis of high, medium and low natural fracture development degree is the density value of the natural fracture, and the brittleness index refers to the rock brittleness index measured when rock mineral content test analysis is carried out on a reservoir rock sample.

Step S202, scoring the brittleness index.

And (4) scoring the brittleness index, namely correspondingly scoring the influence degree of the complex seam net forming possibility under different brittleness index ranges, wherein the total score is a percentile system.

And step S203, scoring the stress difference in two directions.

Under different stress difference ranges in two directions, the influence degree of the complex seam net forming possibility is correspondingly scored, and the total score is a percentage system.

And step S204, scoring the crack development degree.

And classifying the development degrees of the natural fractures according to high, medium and low, and correspondingly scoring the influence degrees of the possibility of forming the complex fracture network under different development degrees of the natural fractures, wherein the total score is a percentile system.

And step S205, respectively giving certain weights to the stress difference in two directions, the natural fracture development degree and the rock brittleness index.

And respectively giving certain weight to the two-way stress difference, the natural fracture development degree and the rock brittleness index to obtain brittleness index weight, two-way stress difference weight and natural fracture development degree weight, wherein the sum of the brittleness index weight, the two-way stress difference weight and the natural fracture development degree weight is equal to 1.0.

In step S206, a probability value for forming a complex seam net is calculated.

The probability value (%) of forming a complex fracture network is ═ brittleness index score × brittleness index weight + two-way stress difference score × two-way stress difference weight + natural fracture development degree score × natural fracture development degree weight.

And step S207, calculating a demand value for the complex sewing net.

And acquiring specific values of key stratum parameters influencing the complex seam network desirability. The numerical value of the stratum crude oil fluidity is used as a quantitative index of complex seam network demand, wherein the key stratum parameter can be the stratum crude oil fluidity.

And S208, marking the calculation result in the mode selection plate, and selecting a crack distribution mode corresponding to the target area according to the target area of the calculation result falling in the coordinate system.

And marking the possibility value of forming the complex seam net and the demand value of the complex seam net in a plate, and selecting a corresponding seam distribution mode according to the position of the area of the complex seam net in a coordinate system.

It should be noted that, in the method for selecting the fracture setting mode of the horizontal well staged fracturing, the steps S202 to S205 are not performed in sequence.

According to the method and the device, the concrete numerical values of the key stratum parameters influencing the possibility of forming the complex seam network are obtained, the brittleness index is scored, the difference of the stress in two directions is scored, the development degree of the seam is scored, the difference of the stress in two directions, the development degree of the natural seam and the brittleness index of the rock are respectively given certain weights, and the possibility value of forming the complex seam network is calculated. Calculating the value of the complex seam network, marking the calculation result in a mode selection chart, selecting a crack distribution mode corresponding to a target area according to the target area of the complex seam network, avoiding the defect of selection depending on experience in the previous crack distribution mode selection, and avoiding the problem of insufficient or excessive modification of an oil reservoir due to improper selection of the crack distribution mode, thereby well matching the selected crack distribution mode with the geological characteristics of the oil reservoir and improving the oil reservoir fracturing modification effect.

The invention provides a horizontal well staged fracturing fracture seam distribution mode selection method, which comprises the following steps:

and step S1, determining key stratum parameters influencing the possibility of forming the complex fracture network, wherein the key stratum parameters comprise the stress difference in two directions, the development degree of the natural fracture and the rock brittleness index.

And step S2, carrying out quantitative evaluation on the complex seam net forming possibility by adopting a comprehensive fuzzy evaluation rule to obtain a numerical value of the complex seam net forming possibility as a quantitative index of the complex seam net forming possibility.

And step S3, determining key parameters influencing the complex seam network demand, wherein the parameters are the stratum crude oil fluidity, and the stratum crude oil fluidity is used as a quantitative index of the complex seam network demand.

And step S4, determining a fracture arrangement mode to be adopted by the oil reservoir according to the demand value of the actual oil reservoir for the complex fracture network and the possibility value of forming the complex fracture network, wherein the demand value falls in the region of the coordinate system.

Specifically, the step S2 of calculating the complex seam net forming possibility value by using the comprehensive fuzzy evaluation rule includes the following steps:

and step S21, acquiring specific values of key stratum parameters influencing the possibility of forming the complex seam network.

Key formation parameters may include the differential bidirectional stress, the extent of natural fracture development, and the rock brittleness index.

Step S22, scoring the brittleness index, for example, scoring 0 score when the brittleness index is 0-0.2; when the brittleness index is 0.2-0.4, scoring for 30 points; when the brittleness index is 0.4-0.6, scoring 70 points; when the brittleness index is 0.6-1.0, the score is 100.

Step S23, scoring the stress difference in two directions, for example, when the stress difference in two directions is 0-3 MPa, scoring 100 points; when the stress difference in two directions is 3-5 MPa, scoring 70 points; when the stress difference in two directions is 5-10 MPa, scoring 50 points; when the stress difference in two directions is 10-15 MPa, scoring for 20 points; when the stress difference in two directions is larger than 15MPa, the score is 0.

Step S24, scoring the natural crack development degree, for example, scoring 100 points when the natural crack development degree is high; when the natural crack development degree is medium, the score is 50; when the natural fracture development degree is low, a score of 0 is given.

Step S25, respectively giving a certain weight to the stress difference in two directions, the natural fracture development degree, and the rock brittleness index, for example, the weight of the stress difference in two directions is 0.3, the weight of the natural fracture development degree is 0.3, the weight of the rock brittleness index is 0.4, and the sum of the three weights is equal to 1.0.

In step S26, a probability value for forming a complex stitch net is calculated.

Specifically, for the step S3, determining a key parameter that affects the complex fracture network desirability, where the parameter is the formation crude oil fluidity, and the formation crude oil fluidity is used as a quantitative index of the complex fracture network desirability, an embodiment of the present invention further provides a method for calculating a value of the complex fracture network desirability, including the following steps:

and step S31, acquiring specific values of the key stratum parameters influencing the complex seam network desirability.

Optionally, the key formation parameter is formation crude oil mobility.

And step S32, taking the numerical value of the formation crude oil fluidity as a quantitative index of the complex seam network demand.

Specifically, step S4, determining, according to the demand value of the actual oil reservoir for the complex seam network and the probability value of forming the complex seam network, that the fracture pattern that should be adopted by the oil reservoir falls in the region of the coordinate system, includes: and marking the possibility value of forming the complex seam net and the demand value of the complex seam net in a plate, and selecting a corresponding seam distribution mode according to the area of the complex seam net falling in the coordinate system.

The embodiment of the invention provides a horizontal well staged fracturing crack distribution mode selection plate which quantificationally considers the possibility of forming a complex crack network and the demand for the complex crack network. The mode selection plate includes:

(1) establishing a two-dimensional rectangular coordinate system, wherein the abscissa is a possible variable for forming a complex seam network, the abscissa can be in units of% and the ordinate is a demand variable for the complex seam network (quantified by the stratum crude oil fluidity, the larger the stratum crude oil fluidity is, the smaller the demand for the complex seam network is, conversely, the smaller the stratum crude oil fluidity is, the larger the demand for the complex seam network is, and the unit of the ordinate is mD/mPa · s;

(2) and calibrating and forming five regions according to the data of the demand variables for the complex seam network and the data of the possibility variables for forming the complex seam network in the two-dimensional rectangular coordinate system, wherein the five regions are respectively a conventional segmentation region, a subdivision cutting region, a complex seam network region, a multi-branch seam region, subdivision cutting or a multi-branch seam region.

Fig. 3 is a schematic diagram of a fracture setting pattern selection plate for horizontal well staged fracturing according to an embodiment of the invention. As shown in fig. 3, the abscissa axis of the horizontal well staged fracturing fracture setting pattern selection plate is used for representing the possibility of complex formation of fractures of a reservoir, and the unit is%, and the ordinate axis is used for representing the demand for a complex fracture network and the unit is mobility mD/mPa · s. The crack arrangement mode selection plate comprises five regions, namely a conventional segmentation region, a subdivision cutting region, a complex seam net region, a multi-branch seam region, subdivision cutting or a multi-branch seam region.

Optionally, when a horizontal well staged fracturing fracture pattern selection chart is generated, determining that two key parameters influencing the horizontal well staged fracturing fracture pattern selection are the possibility of forming a complex fracture network and the demand for the complex fracture network. Respectively taking two variables of the possibility of forming the complex seam net and the demand for the complex seam net as the abscissa and the ordinate of a coordinate system; combining the possibility of forming complex seam webs differently with the desirability of complex seam webs; selecting a proper seam distribution mode for each possibility of forming the complex seam network and the demand combination of the complex seam network to form five regions, namely a conventional segmentation region, a subdivision cutting region, a complex seam network region, a multi-branch seam region, a subdivision cutting region or a multi-branch seam region; and finishing drawing the plate.

The fracture arrangement mode selection chart is reliable, two key indexes which influence the selection of the fracture arrangement mode are fully considered, namely the requirement for the complex fracture network and the possibility of forming the complex fracture network, so that the selected fracture arrangement mode is well matched with the geological characteristics of an oil reservoir, the development benefit of an oil field is improved, and the sectional fracturing fracture mode selection of the horizontal well can be conveniently and quickly realized.

Fig. 4 is a schematic diagram of a fracture arrangement mode selection plate for horizontal well staged fracturing with control points according to an embodiment of the invention. As shown in fig. 4, the horizontal well staged fracturing seam-laying mode selection plate of this embodiment is composed of five regions, namely, a conventional staged region, a subdivided cutting region, a complex fracture network region, a multi-branch seam region, a subdivided cutting region, or a multi-branch seam region. Each zone is bounded by primary control points, wherein a conventional segmented zone boundary line is determined by five boundary points: the device comprises a base, a plurality of points, a plurality of sensors and a plurality of sensors, wherein the sensors are respectively 1 point, 2 points, 3 points, 4 points and 5 points, the five points are sequentially connected, the 3 points and the 4 points are connected through a curve, and other points are connected through straight lines; the subdivided cutting area boundary line is determined by five boundary points: the points are respectively 5 points, 4 points, 6 points, 7 points and 8 points, and the five points are sequentially connected through a straight line; the complex slotted-net area boundary line is determined by five boundary points: the points are 7 points, 6 points, 9 points, 10 points and 11 points respectively, the five points are connected in sequence, the 6 points and the 9 points are connected through a curve, and other points are connected through a straight line; the multi-branch seam region boundary line is determined by five boundary points: the points are respectively 2 points, 3 points, 9 points, 10 points and 12 points, and the five points are connected in sequence through straight lines.

Fig. 5 is a schematic diagram of another horizontal well staged fracturing fracture layout pattern selection template according to an embodiment of the invention. As shown in fig. 5, the horizontal well staged fracturing fracture seam arrangement mode selection plate is composed of five regions, namely a conventional staged region, a subdivided cutting region, a complex seam network region, a multi-branch seam region, a subdivided cutting region or a multi-branch seam region.

Each zone is bounded by a primary control point, and the boundary line of a conventional segmented zone is determined by five boundary points: the three-dimensional image display device comprises 1 point (0, 1000 mD/mPas), 2 points (40%, 1000 mD/mPas), 3 points (40%, 100 mD/mPas), 4 points (20%, 10 mD/mPas) and 5 points (0, 10 mD/mPas), wherein the five points are connected in sequence, the 3 points and the 4 points are connected through curves, and other points are connected through straight lines.

The boundary line subdividing the cutting area is determined by five boundary points: the five points are connected in sequence by straight lines, wherein the five points are 5 points (0, 10 mD/mPas), 4 points (20%, 10 mD/mPas), 6 points (60%, 0.1 mD/mPas), 7 points (60%, 0.01 mD/mPas) and 8 points (0, 0.01 mD/mPas).

The boundary line of the complex slotted-net region is determined by five boundary points: the light-emitting diode is characterized in that the light-emitting diode is formed by sequentially connecting 7 points (60%, 0.01 mD/mPas), 6 points (60%, 0.1 mD/mPas), 9 points (80%, 1 mD/mPas), 10 points (100%, 1 mD/mPas) and 11 points (100%, 0.01 mD/mPas), wherein the 6 points and the 9 points are connected through a curve, and the other points are connected through a straight line.

The boundary line of the multi-branch slit region is determined by five boundary points: the dots 2 (40%, 1000 mD/mPas), 3 (40%, 100 mD/mPas), 9 (80%, 1 mD/mPas), 10 (100%, 1 mD/mPas) and 12 (100%, 1000 mD/mPas) are connected in sequence by straight lines.

The embodiment realizes the purposes that the possibility of forming the complex seam net and the requirement of the complex seam net are combined differently, and a proper cloth seam mode is selected for each combination of the possibility of forming the complex seam net and the requirement of the complex seam net to form five areas.

Fig. 6 is a schematic diagram of a fracture and fissure pattern selection result of horizontal well staged fracturing of a Baikou spring group reservoir of a Mahu oil field Ma 131 well zone according to an embodiment of the invention. As shown in fig. 6, before obtaining a fracture setting pattern selection result of horizontal well staged fracturing, the selecting, by using an application plate of a Baikou spring group oil reservoir of a ma 131 well region of a ma lake oil field, of the fracture setting pattern of the horizontal well staged fracturing includes:

(1) the brittleness index of the obtained Mar lake oil field Mar 131 well Baikouquan group oil reservoir rock is 0.31, the stress difference in two directions is 14MPa, and the linear density of natural cracks is 6/m.

(2) The brittleness index was scored. The brittleness index was 0.31 and the score was 30.

(3) And (5) scoring the stress difference in two directions. The stress difference in two directions is 14MPa, and the score is 20.

(4) And (5) scoring the development degree of the natural crack. The density of the natural crack lines is 6/m, the development degree of the natural cracks is low, and the score is 0.

(5) The rock brittleness index, the stress difference in two directions and the natural crack development degree are respectively weighted by 0.4, 0.3 and 0.3, and the sum of the three weights is equal to 1.0.

(6) Calculating a likelihood value of forming the complex seam network.

The probability value (%) of forming a complex fracture network is 30 × 0.4+20 × 0.3+0 × 0.3 ═ 18 (%), brittle index score × brittle index weight + two-way stress difference score × two-way stress difference weight + natural fracture development degree score × natural fracture development degree weight.

(7) And calculating the demand value of the complex seam net.

The above-mentioned demand value for the complex fracture network may be a formation crude oil mobility value, which is optionally 0.73mD/mPa · s.

(8) Marking the possibility value of forming the complex sewing net and the demand value of the complex sewing net in a plate, wherein the 'ma 131' shown in figure 6 falls into a subdivision cutting area, and a crack seam distribution mode of subdivision cutting is selected.

Fig. 7 is a schematic diagram of a fracture setting mode selection result of horizontal well staged fracturing of a fossil-carbon-series oil deposit of a Jinlong oilfield Jinlong 10 well zone according to an embodiment of the invention. Before obtaining a fracture setting mode selection result of horizontal well staged fracturing, as shown in fig. 7, the selecting of the horizontal well staged fracturing setting mode by using the Jinlong oilfield Jinlong 10 well area carbo oil reservoir application template comprises the following steps:

(1) and obtaining the brittleness index 0.604 of the rock of the carbo-rock oil reservoir of the Jinlong 10 well region, the stress difference between two directions is 5MPa, and the linear density of a natural fracture is 10/m.

(2) The brittleness index was scored. Friability index 0.604, score 100.

(3) And (5) scoring the stress difference in two directions. The stress difference in two directions is 7MPa, and the score is 50.

(4) And (5) scoring the development degree of the natural crack. The density of the natural crack lines is 10/m, the development degree of the natural crack is high, and the score is 100.

(6) Calculating a likelihood value of forming the complex seam network.

The probability value (%) of forming a complex fracture network is ═ brittleness index score × brittleness index weight + two-way stress difference score × two-way stress difference weight + natural fracture development degree score × natural fracture development degree weight ═ 85 (%) (100 × 0.4+50 × 0.3+100 × 0.3).

(7) And calculating the demand value of the complex seam net.

The above-mentioned demand for complex fracture network may be a formation crude oil mobility value, which is optionally 0.75mD/mPa · s.

(8) Marking the possibility value of forming the complex seam network and the demand value of the complex seam network in a chart board, and selecting a result chart of a staged fracturing fracture seam distribution mode of a Jinlong oilfield Jinlong 10 well area carbo oil reservoir horizontal well, wherein the Jinlong 10 shown in the chart 7 falls in a complex seam network area of a coordinate system, and the fracture seam distribution mode of the complex seam network is selected.

The embodiment of the invention can achieve the following beneficial technical effects:

(1) the crack arrangement mode selection plate is reliable. The crack cloth seam mode selection chart is used for completing chart drawing on the basis of a large amount of theoretical research and field application, and the results are reliable after verification of oil fields such as a Mahu oil field, a Jinlong oil field and the like.

(2) The economy is good. According to the method and the device, two key indexes which influence the selection of the seam distribution mode, namely the requirement on the complex seam network and the possibility of forming the complex seam network, are fully considered in the chart, so that the selected seam distribution mode is well matched with the geological characteristics of the oil deposit, and the development benefit of the oil field can be improved.

(3) Is convenient and quick. By the template provided by the embodiment of the invention, the fracture mode selection of the staged fracturing of the horizontal well can be conveniently and quickly realized according to the fracture mode selection method provided by the invention.

From the above, the seam distribution mode selection plate of the invention selects from five seam distribution modes according to the quantized possibility of forming a complex seam network and the demand value for the complex seam network. The defect that selection is carried out by depending on experience in the conventional crack arrangement mode selection is avoided, and the problem of insufficient or excessive modification of an oil reservoir caused by improper selection of the crack arrangement mode can be avoided. The selected crack distribution mode is well matched with the geological characteristics of the oil reservoir, and the oil reservoir fracturing transformation effect is improved.

The embodiment provides a horizontal well staged fracturing crack distribution mode selection chart and a method considering the possibility of forming a complex crack network and the demand for the complex crack network in a quantified manner, aiming at the problem that the existing horizontal well staged fracturing crack distribution mode selection considers two factors, namely the possibility of forming the complex crack network and the demand for the complex crack network, according to the unquantized consideration. The selection chart and the method are obtained on the basis of a large number of theoretical researches and field application, and the problem of horizontal well staged fracturing seam distribution mode selection can be effectively solved.

Example 3

The embodiment of the invention also provides a device for selecting the fracture arrangement mode of the horizontal well staged fracturing. It should be noted that the device for selecting a fracture setting mode of horizontal well staged fracturing of the embodiment may be used for executing the method for selecting a fracture setting mode of horizontal well staged fracturing of the embodiment of the present invention.

Fig. 8 is a schematic diagram of a fracture setting pattern selection device for horizontal well staged fracturing according to an embodiment of the invention. As shown in fig. 8, the device for selecting the fracture arrangement mode of the horizontal well staged fracturing may include: an acquisition unit 10, a first determination unit 20 and a selection unit 30.

An obtaining unit 10 is used for obtaining the possibility value of forming the complex seam net and the demand value of the complex seam net.

The first determining unit 20 is configured to determine a target region to which corresponding position information on a mode selection plate belongs, where a possibility value for forming a complex seam network and a desirability value for the complex seam network belong, and different regions on the mode selection plate are used to quantitatively represent a preset number of seam laying modes.

And the selecting unit 30 is configured to select a target fracture arrangement mode for staged fracturing of the horizontal well from a preset number of fracture arrangement modes according to the target area.

Optionally, the device for selecting a fracture setting mode of horizontal well staged fracturing further includes: a second determining unit, a third determining unit, a combining unit and a generating unit. The second determining unit is used for determining a first variable corresponding to the possibility value of forming the complex sewing net as an abscissa axis of a preset coordinate system before determining a target area to which corresponding position information on the mode selection plate belongs, the target area corresponding to the position information on the mode selection plate, and the possibility value of forming the complex sewing net and the requirement value of the complex sewing net; the third determining unit is used for determining a second variable corresponding to the demand value of the complex seam network as the ordinate axis of the preset coordinate system; the combination unit is used for combining the position information of the first variable on the abscissa axis and the position information of the second variable on the ordinate axis into regions with preset number on a preset coordinate system, wherein the regions with the preset number correspond to the crack distribution patterns with the preset number one by one; and the generating unit is used for generating the mode selection plate according to the preset number of the areas.

Optionally, the obtaining unit 10 includes: the device comprises a determining module, a first processing module and a second processing module. The determining module is used for determining a first stratum parameter for influencing the possibility of forming the complex seam network and a second stratum parameter for influencing the demand of the complex seam network; the first processing module is used for carrying out quantitative processing on the first stratum parameters to obtain a possibility value of forming a complex seam network; and the second processing module is used for carrying out quantization processing on the second stratum parameters to obtain a demand value for the complex seam network.

Optionally, the first processing module is configured to perform quantization processing on the first formation parameter according to the comprehensive fuzzy evaluation rule to obtain a probability value of forming a complex seam network.

Optionally, the first formation parameters include a bidirectional stress difference parameter, a natural fracture development degree parameter, and a rock brittleness parameter, and the first processing module includes: the device comprises a first obtaining submodule, a second obtaining submodule, a third obtaining submodule, a fourth obtaining submodule and a fifth obtaining submodule. The first acquisition submodule is used for respectively acquiring a numerical value of a two-directional stress difference parameter, a numerical value of a natural fracture development degree parameter and a numerical value of a rock brittleness parameter; the second acquisition submodule is used for acquiring a first score of the influence degree of the numerical value used for expressing the two-direction stress difference parameter on the possibility of forming the complex seam network; the third acquisition submodule is used for acquiring a second score of the influence degree of the numerical value used for expressing the natural fracture development degree parameter on the possibility of forming the complex fracture network; the fourth acquisition submodule is used for acquiring a third fraction of the influence degree of the numerical value for expressing the rock brittleness parameter on the possibility of forming the complex seam network; and the fifth obtaining submodule is used for obtaining a possibility value of forming the complex fracture network according to the first score, the first weight and the second score corresponding to the two-way stress difference parameter, the second weight and the third score corresponding to the natural fracture development degree parameter, and the third weight corresponding to the rock brittleness parameter, wherein the sum of the first weight, the second weight and the third weight is 1.0.

Optionally, the third obtaining submodule is configured to classify the numerical value of the natural fracture development degree parameter to obtain a first classification, a second classification and a third classification, where the numerical value of the natural fracture development degree parameter corresponding to the first classification is higher than the numerical value of the natural fracture development degree parameter corresponding to the second classification, and the numerical value of the natural fracture development degree parameter corresponding to the second classification is higher than the numerical value of the natural fracture development degree parameter corresponding to the third classification; and respectively acquiring second scores of the influence degree of the numerical values of the natural fracture development degree parameters corresponding to the first classification, the second classification and the third classification on the possibility of forming the complex fracture network.

Optionally, the third obtaining sub-module is configured to classify the numerical value of the natural fracture development degree parameter according to the density value of the natural fracture to obtain a first classification, a second classification, and a third classification.

Optionally, the third obtaining sub-module is configured to classify the numerical value of the natural fracture development degree parameter according to the linear density of the natural fracture, the areal density of the natural fracture, or the bulk density of the natural fracture, so as to obtain a first classification, a second classification, and a third classification.

Optionally, the two-way stress difference parameter is used to represent the difference between the maximum level principal stress and the minimum level principal stress of the reservoir; the rock brittleness parameter is used for representing a rock brittleness index determined when rock mineral content analysis is carried out on a reservoir rock sample.

Optionally, the second processing module comprises: a sixth acquisition submodule and a determination submodule. The sixth acquisition submodule is used for acquiring the numerical value of the formation crude oil fluidity; and the determining submodule is used for determining the numerical value of the formation crude oil fluidity as a value of the complex seam network demand.

Optionally, the preset number of seam distribution patterns includes: a conventional segmentation region determined by a first preset number of boundary points; the subdivision cutting area is determined by a second preset number of boundary points; a complex mesh sewing area determined by a third preset number of boundary points; a multi-branch seam region determined by a fourth preset number of boundary points; a subdivided cut or multi-branch slit region defined by a fifth predetermined number of boundary points.

In the embodiment, the possibility value for forming the complex fracture network and the value of the demand for the complex fracture network are obtained by the obtaining unit 10, the target area to which the corresponding position information of the possibility value for forming the complex fracture network and the value of the demand for the complex fracture network on the mode selection plate belongs is determined by the first determining unit 20, wherein different areas on the mode selection plate are used for quantitatively representing the fracture distribution modes with the preset number, the target fracture distribution mode for the horizontal well staged fracturing is selected from the fracture distribution modes with the preset number according to the target area by the selecting unit 30, and the problem that the rationality of reservoir reconstruction is low due to the selection of the horizontal well staged fracturing fracture distribution mode based on the possibility of the complex fracture network formed by the quantitative indexes and the demand for the complex fracture network in the prior art is solved, and further, the effect that the rationality of reservoir reconstruction is higher due to the selection of the staged fracturing fracture setting mode of the horizontal well is achieved.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for selecting a fracture arrangement mode of horizontal well staged fracturing is characterized by comprising the following steps:

acquiring a possibility value for forming a complex seam network and a demand value for the complex seam network, wherein the possibility value for the complex seam network is a numerical value of a two-way stress difference parameter, a numerical value of a natural fracture development degree parameter and a numerical value of a rock brittleness parameter, and the demand value for the complex seam network is a numerical value of a formation crude oil fluidity;

determining a target area to which corresponding position information of the possibility value for forming the complex seam network and the demand value for the complex seam network belongs on a mode selection plate, wherein different areas on the mode selection plate are used for quantitatively representing a preset number of crack seam distribution modes;

selecting a target fracture arrangement mode of the staged fracturing of the horizontal well from the preset number of fracture arrangement modes according to the target area;

before determining the target area to which the corresponding position information of the possibility value for forming the complex seam crossing and the desirability value for the complex seam crossing on the mode selection plate belongs, the method further comprises the following steps: determining a first variable corresponding to the possibility value of forming the complex seam network as an abscissa axis of a preset coordinate system; determining a second variable corresponding to the demand value for the complex seam network as a vertical axis of the preset coordinate system; combining the position information of the first variable on the abscissa axis and the position information of the second variable on the ordinate axis into the regions with the preset number on the preset coordinate system, wherein the regions with the preset number correspond to the crack distribution patterns with the preset number one to one so as to differently combine the possibility value of forming the complex seam network and the value of demand on the complex seam network on the preset coordinate system; and generating the mode selection plate according to the preset number of the areas.

2. The method of claim 1, wherein obtaining the likelihood of forming the complex slotted net and the desirability value for the complex slotted net comprises:

determining a first formation parameter for affecting the likelihood of forming the complex seam network and a second formation parameter for affecting desirability of the complex seam network;

carrying out quantization processing on the first stratum parameters to obtain the probability value of forming the complex seam network;

and carrying out quantization processing on the second stratum parameters to obtain the demand value for the complex seam network.

3. The method of claim 2, wherein quantifying the first formation parameter to obtain the likelihood of forming the complex network of seams comprises: and carrying out quantization processing on the first stratum parameters according to a comprehensive fuzzy evaluation rule to obtain the possibility value of forming the complex seam network.

4. The method of claim 3, wherein the first formation parameters comprise the two-way stress difference parameter, the natural fracture development degree parameter and the rock brittleness parameter, and the quantifying the first formation parameters according to the comprehensive fuzzy evaluation rule to obtain the probability value of forming the complex fracture network comprises:

respectively acquiring a numerical value of the two-direction stress difference parameter, a numerical value of the natural fracture development degree parameter and a numerical value of the rock brittleness parameter;

acquiring a first score for representing the influence degree of the numerical value of the two-way stress difference parameter on the complex seam network forming possibility, wherein the first score is a score obtained according to the comprehensive fuzzy evaluation rule;

acquiring a second score of the influence degree of the numerical value of the natural fracture development degree parameter on the possibility of forming the complex fracture network, wherein the second score is obtained according to the comprehensive fuzzy evaluation rule;

acquiring a third score for representing the influence degree of the numerical value of the rock brittleness parameter on the possibility of forming the complex seam network, wherein the third score is a score obtained according to the comprehensive fuzzy evaluation rule;

and acquiring the probability value of forming the complex fracture network according to the first score and a first weight corresponding to the two-directional stress difference parameter, the second score and a second weight corresponding to the natural fracture development degree parameter, the third score and a third weight corresponding to the rock brittleness parameter, wherein the sum of the first weight, the second weight and the third weight is 1.0.

5. The method of claim 4, wherein obtaining the second score representing the degree of influence of the value of the natural fracture development parameter on the likelihood of complex fracture networks formation comprises:

classifying the numerical value of the natural fracture development degree parameter to obtain a first classification, a second classification and a third classification, wherein the numerical value of the natural fracture development degree parameter corresponding to the first classification is higher than the numerical value of the natural fracture development degree parameter corresponding to the second classification, and the numerical value of the natural fracture development degree parameter corresponding to the second classification is higher than the numerical value of the natural fracture development degree parameter corresponding to the third classification;

and respectively acquiring the second scores of the influence degrees of the numerical values of the natural fracture development degree parameters corresponding to the first classification, the second classification and the third classification on the possibility of forming the complex fracture network.

6. The method of claim 5, wherein classifying the numerical value of the natural fracture development degree parameter, and wherein obtaining the first classification, the second classification, and the third classification comprises:

and classifying the numerical values of the natural fracture development degree parameters according to the density values of the natural fractures to obtain the first classification, the second classification and the third classification.

7. The method of claim 6, wherein classifying the numerical value of the natural fracture development degree parameter according to the density value of the natural fracture, and wherein obtaining the first classification, the second classification, and the third classification comprises:

and classifying the numerical value of the natural fracture development degree parameter according to the linear density of the natural fracture, the surface density of the natural fracture or the bulk density of the natural fracture to obtain the first classification, the second classification and the third classification.

8. The method of claim 4,

the two-direction stress difference parameter is used for representing the difference between the maximum level main stress and the minimum level main stress of the reservoir;

the rock brittleness parameter is used for representing a rock brittleness index measured when rock mineral content analysis is carried out on the reservoir rock sample.

9. The method of claim 2, wherein the second formation parameter comprises the formation crude oil fluidity, and wherein the quantifying the second formation parameter to obtain the desirability value for the complex fracture network comprises:

obtaining a numerical value of the formation crude oil fluidity;

and determining the value of the crude oil fluidity of the stratum as the value of the demand on the complex seam network.

10. The method of any one of claims 1 to 9, wherein the predetermined number of crack patterns comprises:

a conventional segmentation region determined by a first preset number of boundary points;

the subdivision cutting area is determined by a second preset number of boundary points;

a complex mesh sewing area determined by a third preset number of boundary points;

a multi-branch seam region determined by a fourth preset number of boundary points;

a subdivided cut or multi-branch slit region defined by a fifth predetermined number of boundary points.

11. A selection device for fracture arrangement mode of horizontal well staged fracturing is characterized by comprising the following components:

the device comprises an acquisition unit, a calculation unit and a processing unit, wherein the acquisition unit is used for acquiring a possibility value for forming a complex seam network and a demand value for the complex seam network, the possibility value for the complex seam network is a numerical value of a two-way stress difference parameter, a numerical value of a natural fracture development degree parameter and a numerical value of a rock brittleness parameter, and the demand value for the complex seam network is a numerical value of formation crude oil fluidity;

the first determining unit is used for determining a target area to which corresponding position information of the possibility value for forming the complex seam network and the demand value for the complex seam network belongs on a mode selection plate, wherein different areas on the mode selection plate are used for quantitatively representing a preset number of crack seam distribution modes;

the selecting unit is used for selecting a target fracture arrangement mode of the staged fracturing of the horizontal well from the preset number of fracture arrangement modes according to the target area;

the device is further used for determining a first variable corresponding to the complex seam network forming possibility value as an abscissa axis of a preset coordinate system before determining a target area to which the position information corresponding to the complex seam network forming possibility value and the complex seam network demanding value on the mode selection plate belongs; determining a second variable corresponding to the demand value for the complex seam network as a vertical axis of the preset coordinate system; combining the position information of the first variable on the abscissa axis and the position information of the second variable on the ordinate axis into the regions with the preset number on the preset coordinate system, wherein the regions with the preset number correspond to the crack distribution patterns with the preset number one to one so as to differently combine the possibility value of forming the complex seam network and the value of demand on the complex seam network on the preset coordinate system; and generating the mode selection plate according to the preset number of the areas.

12. The apparatus of claim 11, further comprising:

a second determining unit, configured to determine, before determining a target area to which corresponding position information on the mode selection plate corresponds, the possibility value of forming a complex seam network and the desirability value of the complex seam network, and determine a first variable corresponding to the possibility value of forming the complex seam network as an abscissa axis of a preset coordinate system;

a third determining unit, configured to determine a second variable corresponding to the demanded value of the complex seam network as a ordinate axis of the preset coordinate system;

the combination unit is used for combining the position information of the first variable on the abscissa axis and the position information of the second variable on the ordinate axis into the preset number of regions on the preset coordinate system, wherein the preset number of regions correspond to the preset number of crack distribution modes one to one;

and the generating unit is used for generating the mode selection plate according to the preset number of areas.