CN114526045A

CN114526045A - Horizontal well energization method and device and computer readable storage medium

Info

Publication number: CN114526045A
Application number: CN202011319079.6A
Authority: CN
Inventors: 田福春; 构小婷; 廖兴松; 李东平; 付大其; 赵玉东; 贾云鹏; 张胜传; 邵力飞; 郝桂宪; 秦飞翔; 刘学伟; 闫阳; 杨立永
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2022-05-24
Anticipated expiration: 2040-11-23
Also published as: CN114526045B

Abstract

The embodiment of the application discloses a horizontal well energization method and device and a computer readable storage medium, and belongs to the field of oil and gas reservoir development. In the embodiment of the application, the section spacing of the horizontal well is determined by considering the corresponding relation between the permeability and the radius of the current-prone area, the displacement can be formed between different sections of the horizontal well, the stratum energy can be supplemented in all the sections of the horizontal well by adopting a fracturing and energy storage alternate construction mode, the water drive effect is formed in a target layer, the stable production time is prolonged after the pressure is increased, and the productivity is also improved.

Description

Horizontal well energization method and device and computer readable storage medium

Technical Field

The embodiment of the application relates to the field of oil and gas reservoir development, in particular to a horizontal well energization method and device and a computer readable storage medium.

Background

Along with the continuous deepening of the exploration and development depth of the oil field, the low-permeability and ultra-low-permeability reservoir layer accounts for higher and higher proportion, and the current oil and gas reservoir mainly develops horizontally, namely a horizontal well is built for oil and gas exploitation.

In the related art, because the hypotonic, ultra-hypotonic reservoirs have no energy replenishment, the fracturing fluid is relied upon to replenish the energy to produce the hydrocarbons. That is, in the related art, a large amount of fracturing fluid is pressed into a stratum by adopting a large-scale fracturing process to be injected into a horizontal well, the fracturing fluid is not immediately drained back after the injection, a long-time soaking is waited, and the well is opened for production after oil and water are imbibed and replaced.

Because the fracturing fluid is used for supplementing the formation energy, the fluid quantity is large, and the fracturing fluid has great damage to the formation in the stewing process after the fracturing. In addition, if the soaking time is short, the dialysis replacement effect is poor, the productivity is low, and if the soaking time is long, no productivity exists in the soaking time, so that the productivity construction is greatly influenced. Therefore, it is necessary to provide a new solution to improve the productivity of low-permeability and ultra-low-permeability reservoirs.

Disclosure of Invention

The embodiment of the application provides a horizontal well energization method, a horizontal well energization device and a computer-readable storage medium, and the capacity of low-permeability and ultra-low-permeability reservoirs can be improved. The technical scheme is as follows:

in one aspect, a horizontal well energization method is provided, and the method includes:

determining the subsection interval of a horizontal well in a target layer according to the permeability and the length of a perforation section of the target layer and the corresponding relation between the permeability and the radius of the current-prone area;

dividing the horizontal well into a plurality of sections to be constructed according to the subsection spacing of the horizontal well;

and performing fracturing and energy storage alternate construction on the plurality of sections to be constructed.

Optionally, the determining the segment spacing of the horizontal well in the target layer according to the permeability and the perforation segment length of the target layer and the corresponding relationship between the permeability and the radius of the easy flow area includes:

determining the radius of the current-prone area of the target layer according to the permeability of the target layer and the corresponding relation between the permeability and the radius of the current-prone area;

and determining the subsection interval of the horizontal well according to the radius of the current zone of the target layer and the length of the perforation section.

Optionally, determining the segmental interval of the horizontal well according to the radius of the easy flow area and the length of the perforation section comprises:

dividing the horizontal well into one or more perforation sections according to the perforation positions corresponding to the dessert sections in the target layer;

and determining the corresponding segment interval of the corresponding perforation segment according to the radius of the easily flowing area and the length of the perforation segment of each perforation segment in the one or more perforation segments.

Optionally, before determining the segment spacing of the horizontal well in the target zone according to the permeability and the perforation segment length of the target zone and the corresponding relationship between the permeability and the radius of the easy flow zone, the method further includes:

and determining the perforation positions corresponding to the dessert sections in the target layer according to the comprehensive logging data and the comprehensive logging data of the target layer, wherein the dessert sections comprise the plurality of sections to be constructed.

Optionally, the plurality of sections to be constructed include a plurality of fracturing sections and a plurality of energizing sections, the plurality of fracturing sections are odd-numbered sections of the plurality of sections to be constructed, the plurality of energizing sections are even-numbered sections of the plurality of sections to be constructed, or the plurality of fracturing sections are even-numbered sections of the plurality of sections to be constructed, and the plurality of energizing sections are odd-numbered sections of the plurality of sections to be constructed;

the to a plurality of sections of treating construction carry out fracturing and energy storage construction in turn, include:

selecting one section to be constructed from the plurality of sections to be constructed in sequence according to the construction sequence, and executing the following operations until each section to be constructed in the plurality of sections to be constructed is executed:

if the selected section to be constructed is a fracturing section, performing perforation and fracturing construction on the selected fracturing section according to the perforation position and the fracturing liquid injection amount corresponding to the selected fracturing section;

and if the selected section to be constructed is the energizing section, performing perforation and energy storage construction on the selected energizing section according to the perforation position and the energizing liquid injection amount corresponding to the selected energizing section.

Optionally, before performing alternate fracturing and energy storage construction on the plurality of sections to be constructed, the method further includes:

determining the fracturing fluid injection amount corresponding to each fracturing section according to the physical properties of the perforating section corresponding to each fracturing section in the plurality of fracturing sections;

and determining the injection liquid amount of the energizing liquid corresponding to the corresponding energizing section according to the physical properties of the perforation section corresponding to each energizing section in the plurality of energizing sections.

Optionally, the perforating and energy storage construction is performed on the selected energization segment according to the perforation position corresponding to the selected energization segment and the amount of the energization liquid injection liquid, and the perforating and energy storage construction comprises:

perforating the selected energizing section according to the perforating position corresponding to the selected energizing section;

and injecting energizing liquid into the energized section after perforation according to the amount of the energizing liquid injection liquid of the selected energized section, wherein the energizing liquid comprises slick water and a surfactant.

In another aspect, a horizontal well energization apparatus is provided, the apparatus comprising:

the first determination module is used for determining the subsection interval of the horizontal well in the target layer according to the permeability and the perforation section length of the target layer and the corresponding relation between the permeability and the radius of the current zone;

the segmentation module is used for dividing the horizontal well into a plurality of sections to be constructed according to the segmentation intervals of the horizontal well;

and the execution module is used for performing fracturing and energy storage alternate construction on the plurality of sections to be constructed.

Optionally, the first determining module includes:

the first determining submodule is used for determining the radius of the easy flow area of the target layer according to the permeability of the target layer and the corresponding relation between the permeability and the radius of the easy flow area;

and the second determining submodule is used for determining the subsection interval of the horizontal well according to the radius of the current zone of the target layer and the length of the perforation section.

Optionally, the second determining submodule is configured to:

Optionally, the apparatus further comprises:

and the second determination module is used for determining the perforation positions corresponding to the dessert sections in the target layer according to the comprehensive well logging data and the comprehensive well logging data of the target layer, wherein the dessert sections comprise the plurality of sections to be constructed.

the execution module comprises:

the selection submodule is used for sequentially selecting one section to be constructed from the plurality of sections to be constructed according to the construction sequence and executing the following operations until each section to be constructed in the plurality of sections to be constructed is executed with the following operations:

the first execution submodule is used for carrying out perforation and fracturing construction on the selected fracturing section according to the perforation position and the fracturing liquid injection amount corresponding to the selected fracturing section if the selected section to be constructed is the fracturing section;

and the second execution submodule is used for performing perforation and energy storage construction on the selected energization section according to the perforation position and the energization liquid injection liquid amount corresponding to the selected energization section if the selected section to be constructed is the energization section.

Optionally, the execution module further includes:

the third determining submodule is used for determining the fracturing fluid injection amount corresponding to the corresponding fracturing section according to the physical property of the perforation section corresponding to each fracturing section in the plurality of fracturing sections;

and the fourth determining submodule is used for determining the injection liquid amount of the energizing liquid corresponding to the corresponding energizing section according to the physical property of the perforation section corresponding to each energizing section in the plurality of energizing sections.

Optionally, the second execution submodule is configured to:

In another aspect, a computer device is provided, where the computer device includes a processor, a communication interface, a memory, and a communication bus, where the processor, the communication interface, and the memory complete mutual communication through the communication bus, the memory is used to store a computer program, and the processor is used to execute the program stored in the memory, so as to implement the steps of the horizontal well energization method.

In another aspect, a computer readable storage medium is provided, in which a computer program is stored, and the computer program is executed by a processor to implement the steps of the horizontal well energization method.

In another aspect, a computer program product is provided comprising instructions which, when run on a computer, cause the computer to perform the steps of the horizontal well energization method described above.

The technical scheme provided by the embodiment of the application can at least bring the following beneficial effects:

in the embodiment of the application, the section spacing of the horizontal well is determined by considering the corresponding relation between the permeability and the radius of the current-prone area, the displacement can be formed between different sections of the horizontal well, the stratum energy can be supplemented in all the sections of the horizontal well by adopting a fracturing and energy storage alternate construction mode, the water drive effect is formed in a target layer, the stable production time is prolonged after the pressure is increased, and the productivity is also improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a flowchart of a horizontal well energization method according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a horizontal well energization device provided in an embodiment of the present application;

fig. 3 is a schematic structural diagram of a computer device according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present application more clear, the embodiments of the present application will be further described in detail with reference to the accompanying drawings.

Next, a detailed explanation is given of the horizontal well energization method provided in the embodiment of the present application.

Fig. 1 is a flowchart of a horizontal well energization method provided in an embodiment of the present application. Referring to fig. 1, the method includes the following steps.

Step 101: and determining the subsection interval of the horizontal well in the target layer according to the permeability and the perforation section length of the target layer and the corresponding relation between the permeability and the radius of the current-prone area.

In the embodiment of the application, research is carried out on low-permeability and ultra-low-permeability reservoirs, and a horizontal well is built in a target layer of a research area to carry out oil and gas exploitation. Because the sectional spacing of the horizontal well in the target layer influences the subsequent imbibition effect and displacement effect and influences the capacity construction, and the radius of the current-prone zone and the length of the perforation section in the target layer are factors to be considered for the horizontal well in the scheme, the sectional spacing of the horizontal well in the target layer is determined according to the permeability and the length of the perforation section of the target layer and the corresponding relation between the permeability and the radius of the current-prone zone.

In the embodiment of the application, the corresponding relationship between the permeability and the radius of the easy flow area is determined and stored in advance according to the physical properties of the reservoir in the area where the target layer is located, and the corresponding relationship between the permeability and the radius of the easy flow area in different areas and different reservoirs is different.

In the embodiment of the present application, with the permeability and the perforation segment length of the target layer and the corresponding relationship between the permeability and the radius of the easy flow area being known, the implementation manner of determining the segment spacing of the horizontal well in the target layer is as follows: determining the radius of the easy flow area of the target layer according to the permeability of the target layer and the corresponding relation between the permeability and the radius of the easy flow area, and determining the section interval of the horizontal well according to the radius of the easy flow area of the target layer and the length of the perforation section.

Table 1 shows a relationship between permeability and radius of the easy flow area provided in the examples of the present application. As shown in table 1, when the permeability of the target layer is 1.75mD (millidarcy) or less, the radius of the easily-flowing zone of the target layer is 6.7 m, when the permeability of the target layer is 5.5mD or more and 1.75mD or more, the radius of the easily-flowing zone of the target layer is 12.5 m, when the permeability of the target layer is 9mD or more and 19 m, when the permeability of the target layer is 15mD or more and 25 m, when the permeability of the target layer is 35mD or more and 15 mm or less, the radius of the easily-flowing zone of the target layer is 38 m, and when the permeability of the target layer is 35mD or more, the radius of the easily-flowing zone of the target layer is 51 m.

TABLE 1

Permeability mD	≤1.75	(1.75，5.5]	(5.5，9]	(9，15]	(15，35]	>35
							Radius of easily flowing area, meter	6.7	12.5	19	25	38	51

The above correspondence between permeability and radius of the easily flowing region shown in table 1 is merely for illustration, table 1 is applicable to a hypotonic, ultra-hypotonic reservoir in one or some of the studied regions, and table 1 itself does not constitute a limitation to the examples of the present application. In addition, it should be noted that, in the embodiments of the present application, the permeability of the target layer may refer to an average permeability of an area where the target layer is located.

Illustratively, assuming that the permeability of the destination layer is 3mD, the radius of the easy flow zone of the destination layer may be determined to be 12.5 m according to the corresponding relationship between the permeability and the radius of the easy flow zone shown in table 1.

In an embodiment of the present application, the stored reservoir properties of the destination layer include permeability of the destination layer. The length of the perforation segment of the target layer is pre-stored, and the length of the perforation segment of the target layer is a value set according to experience, for example, the length of the perforation segment of the target layer is pre-set and stored according to experience to be 10 meters.

Alternatively, the length of the perforation segment of the target layer is a value determined according to the corresponding perforation position of the dessert segment in the target layer. In one implementation, the horizontal well is divided into one or more perforation segments according to the perforation positions corresponding to the dessert segments in the destination layer, each perforation segment comprises a plurality of perforation positions, each perforation segment corresponds to a perforation segment length, and the perforation segment length can refer to the length from the first perforation position to the last perforation position in the corresponding perforation segment. Optionally, the perforation segment length of the destination layer is an average value of perforation segment lengths corresponding to the one or more perforation segments, and the average value is used as the perforation segment length of the destination layer. Or taking the perforation segment length corresponding to the one or more perforation segments as the perforation segment length of the target layer.

And determining the dessert section in the target layer and the perforation position corresponding to the dessert section according to the comprehensive logging data and the comprehensive logging data of the target layer. That is, before determining the interval between the horizontal wells in the target layer according to the permeability and the length of the perforation section of the target layer and the corresponding relationship between the permeability and the radius of the easy flow area, the perforation position corresponding to the dessert section in the target layer, that is, the dessert section is prioritized and the perforation position is determined according to the comprehensive well logging data and the comprehensive well logging data of the target layer.

In the embodiment of the application, after the radius of the easily flowing area and the length of the perforation section are determined, the section interval of the horizontal well is determined according to the radius of the easily flowing area and the length of the perforation section.

As can be seen from the foregoing, the length of the perforation segment of the target zone is a value stored in advance, or an average value of the lengths of the perforation segments corresponding to one or more perforation segments, in this case, the length of the perforation segment is added to twice the radius of the easy flow area, so as to obtain the interval between the horizontal wells, that is, the horizontal well is evenly segmented.

For example, assuming that the radius of the easy flow zone of the target zone is 12.5 meters, and the length of the perforation segment of the target zone is 10 meters, the interval between the segments of the horizontal well is 10+12.5 × 2-35 meters.

Or the length of the perforation section of the target layer is the length of the perforation section corresponding to one or more perforation sections, that is, the length of the perforation section of the target layer is subdivided according to the perforation positions of different perforation sections, and in this case, the segment interval corresponding to the corresponding perforation section is determined according to the radius of the current-prone zone and the length of the perforation section corresponding to each perforation section in the one or more perforation sections, that is, the segment interval of the horizontal well is obtained. And adding twice of the radius of the easy flow area to the length of the perforation section corresponding to each perforation section to obtain the corresponding subsection interval of the corresponding perforation section.

Illustratively, assuming that the radius of the free-flow zone of the target formation is 12.5 meters, the horizontal well in the target formation includes 3 perforation segments, and the perforation segments corresponding to the 3 perforation segments are 8 meters, 9 meters and 10 meters, respectively, the segment interval corresponding to the first perforation segment is 8+12.5 × 2-33 meters, the segment interval corresponding to the second perforation segment is 9+12.5 × 2-34 meters, and the segment interval corresponding to the third perforation segment is 10+12.5 × 2-35 meters. Assuming that the total length of the horizontal well is 1000 meters, the total length of the first perforation section is 300 meters, the total length of the second perforation section is 300 meters, and the length of the third perforation section is 400 meters, the first perforation section is segmented according to the segmented interval of 33 meters, the second perforation section is segmented according to the segmented interval of 34 meters, and the third perforation section is segmented according to the segmented interval of 35 meters.

Step 102: and dividing the horizontal well into a plurality of sections to be constructed according to the subsection spacing of the horizontal well.

In the embodiment of the application, after the segmental interval of the horizontal well is determined, the horizontal well is divided into a plurality of sections to be constructed according to the segmental interval of the horizontal well.

Exemplarily, assuming that the section spacing of a horizontal well is 35 meters and the total length of the horizontal well is 1000 meters, the horizontal well is averagely divided into 29 sections to be constructed, where the 29 sections to be constructed include 28 sections to be constructed with a length of 35 meters and 1 section to be constructed with a length of 20 meters.

It should be noted that the dessert segment in the destination layer includes the multiple segments to be constructed, and the determined perforation positions corresponding to the dessert segment include the perforation positions corresponding to the multiple segments to be constructed.

Step 103: and performing fracturing and energy storage alternate construction on the plurality of sections to be constructed.

In the embodiment of the application, a plurality of construction sections included in the horizontal well are constructed by adopting a fracturing and energy storage alternate construction process. The construction method comprises the following steps of constructing a plurality of sections to be constructed, wherein the plurality of sections to be constructed comprise a plurality of fracturing sections and a plurality of energizing sections, the plurality of fracturing sections are odd sections in the plurality of sections to be constructed, and the plurality of energizing sections are even sections in the plurality of sections to be constructed. Or the plurality of fracturing sections are even sections in the plurality of sections to be constructed, and the plurality of energizing sections are odd sections in the plurality of sections to be constructed. That is, the plurality of sections to be constructed includes a plurality of fracturing sections and a plurality of energizing sections which are alternated in odd-even order

In the embodiment of the application, the implementation manner of performing fracturing and energy storage alternate construction on the plurality of sections to be constructed is as follows: selecting one section to be constructed from the plurality of sections to be constructed in sequence according to the construction sequence, and executing the following operations until each section to be constructed in the plurality of sections to be constructed is executed:

if the selected section to be constructed is a fracturing section, performing perforation and fracturing construction on the selected fracturing section according to the perforation position and the fracturing liquid injection amount corresponding to the selected fracturing section; and if the selected section to be constructed is the energization section, performing perforation and energy storage construction on the selected energization section according to the perforation position corresponding to the selected energization section and the injection liquid amount of the energization liquid.

That is, the multiple sections to be constructed are alternately constructed in odd-even mode, and after one fracturing section is constructed, the adjacent energy increasing sections are continuously constructed. For example, the odd number sections in the multiple sections to be constructed are fracturing sections, the even number sections are energizing sections, after the first section to be constructed is subjected to perforation and fracturing construction, the second section to be constructed is subjected to perforation and energy storage construction, then the third section to be constructed is subjected to perforation and fracturing construction, and the process is repeated until the construction of the multiple sections to be constructed included in the horizontal well is completed.

In this application embodiment, before performing alternate fracturing and energy storage construction on the multiple sections to be constructed, it is necessary to determine the fracturing fluid injection amount corresponding to each fracturing section and determine the energizing fluid injection amount corresponding to each energizing section. And then, when a certain fracturing section is constructed, construction is carried out according to the fracturing fluid injection amount and the perforation position corresponding to the corresponding fracturing section, and when a certain energizing section is constructed, construction is carried out according to the energizing fluid injection amount and the perforation position corresponding to the corresponding energizing section.

Based on this, in the embodiment of the application, before the construction is performed on the multiple sections to be constructed, the injection amount of the fracturing fluid corresponding to the corresponding fracturing section is determined according to the physical properties of the perforation section corresponding to each fracturing section in the multiple fracturing sections, and the injection amount of the energizing fluid corresponding to the corresponding energizing section is determined according to the physical properties of the perforation section corresponding to each energizing section in the multiple energizing sections.

Illustratively, the fracturing fluid injection amount corresponding to each fracturing section is determined through the simulation result of digital-analog software, and the energizing fluid injection amount corresponding to each energizing section is determined. For example, the digital-analog software is meyer software, the physical properties of the perforation section corresponding to each fracturing section are input into the meyer software, a relation curve of the predicted injection liquid amount of the fracturing liquid and the predicted benefit (such as predicted oil production) is output, and the highest point of the relation curve is the finally determined injection liquid amount of the fracturing liquid corresponding to the fracturing section. And inputting the physical property of the perforation section corresponding to each energy increasing section into meyer software, and outputting a relation curve of the predicted injection liquid amount of the energy increasing liquid and the prediction benefit, wherein the highest point of the relation curve is the finally determined injection liquid amount of the energy increasing liquid corresponding to the energy increasing section.

In the embodiment of the application, according to the perforation position and the fracturing fluid injection amount corresponding to the selected fracturing section, the implementation mode of perforation and fracturing construction on the selected fracturing section is as follows: and perforating the selected fracturing section according to the perforating position corresponding to the selected fracturing section, and injecting fracturing fluid into the perforated fracturing section according to the fracturing fluid injection amount of the selected fracturing section.

It should be noted that, in the construction process of the fracturing section, the pressure is limited and the discharge capacity is not limited. Optionally, perforating the fracture refers to multiple clusters of perforations or continuous perforations, which is not limited in this application. Optionally, the fracturing fluid comprises a surfactant. And the surfactant is added into the fracturing fluid, so that the water flooding and imbibition displacement effects can be improved, and the productivity is improved.

In the embodiment of the application, according to the perforation position and the injection liquid amount of the energizing liquid corresponding to the selected energizing section, the implementation mode of perforation and energy storage construction on the selected energizing section is as follows: and perforating the selected energizing section according to the perforating position corresponding to the selected energizing section, and injecting the energizing liquid into the energized section after perforation according to the energizing liquid injection amount of the selected energizing section.

Wherein the energizer liquid comprises slickwater and a surfactant. For example, the energizing liquid (may also be referred to as an energizing working liquid) is a surfactant added to the slickwater at a concentration of 0.1%. The surfactant is added into the energizing liquid, so that the water flooding and imbibition displacement effects can be improved, and the productivity is improved. Optionally, perforating the fracture refers to multiple clusters of perforations or continuous perforations, which is not limited in this application. In addition, the energizing liquid needs to be injected into the corresponding energizing section with large displacement under the fracture pressure of the stratum where the energizing section is located.

It should be noted that, in the embodiment of the present application, after each section to be constructed is constructed, a drillable bridge plug needs to be lowered for layering, that is, after a fracturing section is perforated and fractured, the drillable bridge plug is lowered in the fracturing section, and after an energy increasing section is perforated and stored, the drillable bridge plug is lowered in the energy increasing section. And after all the sections to be constructed are constructed, a downhole tool is put in to completely drill out the bridge plugs in the plurality of fracturing sections and the plurality of energizing sections. Then, the well can be opened for production, or after a small amount of time of soaking, the well can be opened for production. Optionally, the drillable bridge plug running position selects a position where the cementing quality is good and the casing collar is avoided.

In addition, in the application embodiment, before the multiple sections to be constructed are subjected to alternate fracturing and energy storage construction, well bore preparation needs to be performed on the horizontal well according to well control requirements, and illustratively, the well bore preparation comprises well washing, well killing, well dredging, scraping, casing testing, pressure testing, Christmas tree replacement and wellhead reinforcement, and multiple steel wire ropes are added and fixed by ground anchors.

Next, the horizontal well energization method provided in the embodiment of the present application is described in detail with reference to the following steps.

Firstly, determining a dessert section in a target layer according to the comprehensive logging data and the comprehensive logging data of the target layer, and preliminarily determining a perforation position corresponding to the dessert section.

And secondly, determining the radius of the easy flow area of the target layer according to the permeability of the target layer and the corresponding relation between the permeability and the radius of the easy flow area.

And thirdly, determining the subsection interval of the horizontal well according to the radius of the current-prone zone of the target layer and the length of the perforation section, and dividing the horizontal well into a plurality of sections to be constructed according to the subsection interval, wherein the plurality of sections to be constructed comprise a plurality of fracturing sections and a plurality of energizing sections which are alternated in odd-even mode.

And fourthly, according to the physical properties of the perforation section corresponding to each fracturing section, determining the fracturing liquid amount of each section by using digital analog software simulation optimization, namely determining the fracturing liquid injection amount corresponding to each fracturing section in the horizontal well. And (3) according to the physical properties of the perforation section corresponding to each energization section, determining the liquid amount of each energization section by using digital-analog software simulation optimization, namely determining the injection liquid amount of the energization liquid corresponding to each energization section in the horizontal well.

And fifthly, completing preparation of a shaft before construction according to well control requirements. Well control preparation comprises well flushing, well killing, well dredging, scraping, casing testing, pressure testing, Christmas tree replacement and wellhead reinforcement, and multiple steel wire ropes are added and fixed by ground anchors.

And sixthly, performing perforation and fracturing construction on the fracturing section, and limiting pressure and not limiting discharge capacity in the construction process.

And seventhly, putting a drillable bridge plug after the perforation and fracturing construction of the fracturing section is finished. The position where the drillable bridge plug is put down can be selected to have good well cementation quality and avoid the position of a casing coupling.

And eighthly, perforating and energy storage construction are carried out on the energy increasing section. Wherein the energizing fluid (comprising slickwater plus surfactant) is injected at high displacement under burst pressure.

And ninthly, after the perforation and energy storage construction of the energy increasing section is finished, putting a drillable bridge plug.

And tenth, repeating the sixth step to the ninth step, performing perforation and fracturing construction on the odd sections, and performing perforation and energy storage construction on the even sections, or performing perforation and fracturing construction on the even sections, and performing perforation and energy storage construction on the odd sections, namely performing odd-even alternate construction until the horizontal well construction is completed.

And step eleven, after all construction of a plurality of sections to be constructed of the horizontal well is completed, putting down an underground tool to drill all drillable bridge plugs, and opening the well to open and put into production.

Therefore, the embodiment of the application provides a horizontal well intersegment energization measure transformation method, which is characterized in that fracturing and energy storage alternate construction is adopted in a horizontal well, and a water drive effect is formed in a low-permeability and ultra-low-permeability reservoir stratum, wherein a surfactant is added into an energization liquid to improve the water drive efficiency and the imbibition replacement efficiency, and the well stewing time is shortened. The transformation effect of the low-permeability extra-low-permeability reservoir is improved through the synergistic effect of water drive and dialysis displacement.

Next, taking H1 wells as an example, the horizontal well energization method provided in the embodiments of the present application will be described in detail with reference to the following steps.

Firstly, according to the comprehensive logging data and the comprehensive logging data of the target layer, a dessert section in the target layer is optimized, and the perforation position corresponding to the dessert section is determined preliminarily.

And secondly, assuming that the permeability of the target layer is 3mD, determining the radius of the easy flow area of the target layer to be 12.5 meters according to the corresponding relation between the permeability and the radius of the easy flow area shown in the table 1.

And thirdly, assuming that the length of the perforation segment of the target layer is 10m, determining that the segment spacing of the horizontal well is 10+12.5 × 2-35 m. Dividing the horizontal well into a plurality of sections to be constructed according to the subsection spacing, wherein the plurality of sections to be constructed comprise a plurality of fracturing sections and a plurality of energizing sections which are alternated in odd-even mode.

And fourthly, according to the physical properties of the perforation section corresponding to each fracturing section and the physical properties of the perforation section corresponding to each energizing section, determining that the fracturing liquid amount of each section is 1600 cubic by using meyer software simulation optimization, namely the fracturing liquid injection amount of each fracturing section in the horizontal well is 1600 cubic, determining that the energizing liquid amount of each section is 2000 cubic, namely the energizing liquid injection amount of each energizing section in the horizontal well is 2000 cubic.

And fifthly, completing preparation of a shaft before construction according to well control requirements. Preparing a wellbore comprising: well washing, well killing, well dredging, scraping, casing testing, pressure testing, 1000-model Christmas tree replacement, well mouth reinforcement, four steel wire ropes addition and ground anchor fixation.

And sixthly, performing multi-cluster perforation and fracturing construction on the fracturing section, wherein the construction pressure is limited to 69 MPa.

And seventhly, after the perforation and fracturing construction of the fracturing section is finished, putting a drillable bridge plug. The position where the drillable bridge plug is put in selects the position where the well cementation quality is good and the casing coupling is avoided.

Eighthly, carrying out perforation and energy storage construction on the energization section, wherein the discharge capacity is 5-6m under the rupture pressure³/min (cubic meters per minute) into an energizing fluid (containing slickwater + surfactant at a concentration of 0.1%).

And tenth step, repeating the sixth step to the ninth step, performing perforation and fracturing construction on the odd sections, and performing perforation and energy storage construction on the even sections, namely, performing odd-even alternate construction until the horizontal well construction is completed.

And step eleven, after the construction of the horizontal well is finished, putting down an underground tool to drill off all drillable bridge plugs, and opening the well to open and put into production.

From the above, the horizontal well energization method in the embodiment of the application integrates the corresponding relations of the geological dessert section (namely the perforation position in the dessert section), the permeability and the streamline radius to determine the section interval of the horizontal well, so as to ensure that the displacement effect can be formed between different sections of the horizontal well. And by adopting alternate construction of fracturing and energy storage, the stratum energy can be supplemented at each layer section of the horizontal well, and the stable production time after the pressure is increased can be ensured. In addition, due to the fact that fracturing and energy storage alternate construction is adopted, the number of fracturing sections in construction is reduced, sand adding is not needed in energy increasing construction, sand blocking, sand leakage and other construction risks can be brought by sand adding, certain operation cost is achieved by sand adding, and therefore compared with a process that fracturing construction is needed in a horizontal well, operation cost and construction risks are reduced. In addition, the scheme adds the surfactant into the energizing liquid, so that the water drive and imbibition replacement efficiency is improved.

In summary, in the embodiment of the application, the section interval of the horizontal well is determined by considering the corresponding relation between the permeability and the radius of the easy flow area, so that displacement can be formed between different sections of the horizontal well, formation energy can be supplemented to each section of the horizontal well by adopting a fracturing and energy storage alternate construction mode, a water drive effect is formed in a target layer, the stable production time after pressure increase is prolonged, and the productivity is also improved.

All the above optional technical solutions can be combined arbitrarily to form an optional embodiment of the present application, and the present application embodiment is not described in detail again.

Fig. 2 is a schematic structural diagram of a horizontal well energization device 200 according to an embodiment of the present application, where the horizontal well energization device 200 may be implemented as part or all of a computer device by software, hardware, or a combination of the two. Referring to fig. 2, the apparatus 200 includes: a first determination module 201, a segmentation module 202 and an execution module 203.

The first determining module 201 is configured to determine a segment interval of a horizontal well in a target layer according to a permeability and a perforation segment length of the target layer and a corresponding relationship between the permeability and a radius of a current zone;

the segmentation module 202 is used for dividing the horizontal well into a plurality of sections to be constructed according to the segmentation intervals of the horizontal well;

and the execution module 203 is used for performing fracturing and energy storage alternate construction on a plurality of sections to be constructed.

Optionally, the first determining module 201 includes:

and the second determining submodule is used for determining the subsection spacing of the horizontal well according to the radius of the current zone of the target layer and the length of the perforation section.

Optionally, the second determining submodule is configured to:

and determining the corresponding segment interval of the corresponding perforation segment according to the radius of the easy flow area and the length of the perforation segment of each perforation segment in the one or more perforation segments.

Optionally, the apparatus 200 further comprises:

and the second determination module is used for determining the perforation position corresponding to the dessert section in the target layer according to the comprehensive logging data and the comprehensive logging data of the target layer, wherein the dessert section comprises a plurality of sections to be constructed.

Optionally, the multiple sections to be constructed include multiple fracturing sections and multiple energizing sections, the multiple fracturing sections are odd-numbered sections of the multiple sections to be constructed, the multiple energizing sections are even-numbered sections of the multiple sections to be constructed, or the multiple fracturing sections are even-numbered sections of the multiple sections to be constructed, and the multiple energizing sections are odd-numbered sections of the multiple sections to be constructed;

the execution module 203 includes:

Optionally, the executing module 203 further includes:

the third determining submodule is used for determining the fracturing fluid injection amount corresponding to each fracturing section according to the physical properties of the perforating section corresponding to each fracturing section in the plurality of fracturing sections;

and the fourth determining submodule is used for determining the energizing liquid injection amount corresponding to the corresponding energizing section according to the physical property of the perforation section corresponding to each energizing section in the plurality of energizing sections.

Optionally, the second execution submodule is configured to:

and injecting the energizing liquid into the energized section after perforation according to the selected energizing liquid injection amount of the energized section, wherein the energizing liquid comprises slickwater and surfactant.

It should be noted that: when the horizontal well energization device provided by the embodiment is used for energizing a horizontal well, the division of each functional module is only used for illustration, and in practical application, the function distribution can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to complete all or part of the functions described above. In addition, the horizontal well energy increasing device provided by the embodiment and the horizontal well energy increasing method embodiment belong to the same concept, and specific implementation processes are detailed in the method embodiment and are not described again.

Fig. 3 shows a block diagram of a terminal 300 according to an exemplary embodiment of the present application. The terminal 300 may be: a smartphone, a tablet, a laptop, or a desktop computer. The terminal 300 may also be referred to by other names such as user equipment, portable terminal, laptop terminal, desktop terminal, computer device, control device, and the like.

Generally, the terminal 300 includes: a processor 301 and a memory 302.

The processor 301 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and so on. The processor 301 may be implemented in at least one hardware form of a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), and a PLA (Programmable Logic Array). The processor 301 may also include a main processor and a coprocessor, where the main processor is a processor for Processing data in an awake state, and is also called a Central Processing Unit (CPU); a coprocessor is a low power processor for processing data in a standby state. In some embodiments, the processor 301 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content that the display screen needs to display. In some embodiments, the processor 301 may further include an AI (Artificial Intelligence) processor for processing computing operations related to machine learning.

Memory 302 may include one or more computer-readable storage media, which may be non-transitory. Memory 302 may also include high speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in memory 302 is used to store at least one instruction for execution by processor 301 to implement the horizontal well energization methods provided by the method embodiments herein.

In some embodiments, the terminal 300 may further include: a peripheral interface 303 and at least one peripheral. The processor 301, memory 302 and peripheral interface 303 may be connected by a bus or signal lines. Each peripheral may be connected to the peripheral interface 303 by a bus, signal line, or circuit board. Specifically, the peripheral device includes: at least one of radio frequency circuitry 304, display screen 305, camera assembly 306, audio circuitry 307, positioning assembly 308, and power supply 309.

The peripheral interface 303 may be used to connect at least one peripheral related to I/O (Input/Output) to the processor 301 and the memory 302. In some embodiments, the processor 301, memory 302, and peripheral interface 303 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 301, the memory 302 and the peripheral interface 303 may be implemented on a separate chip or circuit board, which is not limited by the embodiment.

The Radio Frequency circuit 304 is used for receiving and transmitting RF (Radio Frequency) signals, also called electromagnetic signals. The radio frequency circuitry 304 communicates with communication networks and other communication devices via electromagnetic signals. The rf circuit 304 converts an electrical signal into an electromagnetic signal to transmit, or converts a received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 304 comprises: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a subscriber identity module card, and so forth. The radio frequency circuitry 304 may communicate with other terminals via at least one wireless communication protocol. The wireless communication protocols include, but are not limited to: metropolitan area networks, various generation mobile communication networks (2G, 3G, 4G, and 5G), Wireless local area networks, and/or WiFi (Wireless Fidelity) networks. In some embodiments, the rf circuit 304 may further include NFC (Near Field Communication) related circuits, which are not limited in this application.

The display screen 305 is used to display a UI (User Interface). The UI may include graphics, text, icons, video, and any combination thereof. When the display screen 305 is a touch display screen, the display screen 305 also has the ability to capture touch signals on or above the surface of the display screen 305. The touch signal may be input to the processor 301 as a control signal for processing. At this point, the display screen 305 may also be used to provide virtual buttons and/or a virtual keyboard, also referred to as soft buttons and/or a soft keyboard. In some embodiments, the display 305 may be one, providing the front panel of the terminal 300; in other embodiments, the display screens 305 may be at least two, respectively disposed on different surfaces of the terminal 300 or in a folded design; in other embodiments, the display 305 may be a flexible display disposed on a curved surface or a folded surface of the terminal 300. Even further, the display screen 305 may be arranged in a non-rectangular irregular figure, i.e., a shaped screen. The Display screen 305 may be made of LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode), and the like.

The camera assembly 306 is used to capture images or video. Optionally, camera assembly 306 includes a front camera and a rear camera. Generally, a front camera is disposed at a front panel of the terminal, and a rear camera is disposed at a rear surface of the terminal. In some embodiments, the number of the rear cameras is at least two, and each rear camera is any one of a main camera, a depth-of-field camera, a wide-angle camera and a telephoto camera, so that the main camera and the depth-of-field camera are fused to realize a background blurring function, and the main camera and the wide-angle camera are fused to realize panoramic shooting and VR (Virtual Reality) shooting functions or other fusion shooting functions. In some embodiments, camera assembly 306 may also include a flash. The flash lamp can be a monochrome temperature flash lamp or a bicolor temperature flash lamp. The double-color-temperature flash lamp is a combination of a warm-light flash lamp and a cold-light flash lamp, and can be used for light compensation at different color temperatures.

Audio circuitry 307 may include a microphone and a speaker. The microphone is used for collecting sound waves of a user and the environment, converting the sound waves into electric signals, and inputting the electric signals to the processor 301 for processing or inputting the electric signals to the radio frequency circuit 304 to realize voice communication. The microphones may be provided in plural numbers, respectively, at different portions of the terminal 300 for the purpose of stereo sound collection or noise reduction. The microphone may also be an array microphone or an omni-directional acquisition microphone. The speaker is used to convert electrical signals from the processor 301 or the radio frequency circuitry 304 into sound waves. The loudspeaker can be a traditional film loudspeaker or a piezoelectric ceramic loudspeaker. When the speaker is a piezoelectric ceramic speaker, the speaker can be used for purposes such as converting an electric signal into a sound wave audible to a human being, or converting an electric signal into a sound wave inaudible to a human being to measure a distance. In some embodiments, audio circuitry 307 may also include a headphone jack.

The positioning component 308 is used to locate the current geographic Location of the terminal 300 to implement navigation or LBS (Location Based Service). The Positioning component 308 may be a Positioning component based on the Global Positioning System (GPS) in the united states, the beidou System in china, the graves System in russia, or the galileo System in the european union.

The power supply 309 is used to supply power to the various components in the terminal 300. The power source 309 may be alternating current, direct current, disposable batteries, or rechargeable batteries. When the power source 309 includes a rechargeable battery, the rechargeable battery may support wired or wireless charging. The rechargeable battery may also be used to support fast charge technology.

In some embodiments, the terminal 300 also includes one or more sensors 310. The one or more sensors 310 include, but are not limited to: acceleration sensor 311, gyro sensor 312, pressure sensor 313, fingerprint sensor 314, optical sensor 315, and proximity sensor 316.

The acceleration sensor 311 may detect the magnitude of acceleration in three coordinate axes of a coordinate system established with the terminal 300. For example, the acceleration sensor 311 may be used to detect components of the gravitational acceleration in three coordinate axes. The processor 301 may control the display screen 305 to display the user interface in a landscape view or a portrait view according to the gravitational acceleration signal collected by the acceleration sensor 311. The acceleration sensor 311 may also be used for acquisition of motion data of a game or a user.

The gyro sensor 312 may detect a body direction and a rotation angle of the terminal 300, and the gyro sensor 312 may cooperate with the acceleration sensor 311 to acquire a 3D motion of the user on the terminal 300. The processor 301 may implement the following functions according to the data collected by the gyro sensor 312: motion sensing (such as changing the UI according to a user's tilting operation), image stabilization at the time of photographing, game control, and inertial navigation.

The pressure sensor 313 may be disposed on a side bezel of the terminal 300 and/or on a lower layer of the display screen 305. When the pressure sensor 313 is disposed on the side frame of the terminal 300, the holding signal of the user to the terminal 300 can be detected, and the processor 301 performs left-right hand recognition or shortcut operation according to the holding signal collected by the pressure sensor 313. When the pressure sensor 313 is disposed at the lower layer of the display screen 305, the processor 301 controls the operability control on the UI interface according to the pressure operation of the user on the display screen 305. The operability control comprises at least one of a button control, a scroll bar control, an icon control and a menu control.

The fingerprint sensor 314 is used for collecting a fingerprint of the user, and the processor 301 identifies the identity of the user according to the fingerprint collected by the fingerprint sensor 314, or the fingerprint sensor 314 identifies the identity of the user according to the collected fingerprint. Upon identifying that the user's identity is a trusted identity, processor 301 authorizes the user to perform relevant sensitive operations including unlocking the screen, viewing encrypted information, downloading software, paying, and changing settings, etc. The fingerprint sensor 314 may be disposed on the front, back, or side of the terminal 300. When a physical button or a vendor Logo is provided on the terminal 300, the fingerprint sensor 314 may be integrated with the physical button or the vendor Logo.

The optical sensor 315 is used to collect the ambient light intensity. In one embodiment, the processor 301 may control the display brightness of the display screen 305 based on the ambient light intensity collected by the optical sensor 315. Specifically, when the ambient light intensity is high, the display brightness of the display screen 305 is increased; when the ambient light intensity is low, the display brightness of the display screen 305 is reduced. In another embodiment, the processor 301 may also dynamically adjust the shooting parameters of the camera head assembly 306 according to the ambient light intensity collected by the optical sensor 315.

A proximity sensor 316, also known as a distance sensor, is typically provided on the front panel of the terminal 300. The proximity sensor 316 is used to collect the distance between the user and the front surface of the terminal 300. In one embodiment, when the proximity sensor 316 detects that the distance between the user and the front surface of the terminal 300 gradually decreases, the processor 301 controls the display screen 305 to switch from the bright screen state to the dark screen state; when the proximity sensor 316 detects that the distance between the user and the front surface of the terminal 300 is gradually increased, the display screen 305 is controlled by the processor 301 to switch from the breath-screen state to the bright-screen state.

Those skilled in the art will appreciate that the configuration shown in fig. 3 is not intended to be limiting of terminal 300 and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components may be used.

In some embodiments, a computer readable storage medium is further provided, in which a computer program is stored, and the computer program is executed by a processor to implement the steps of the horizontal well energization method in the above embodiments. For example, the computer readable storage medium may be a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

It is noted that the computer-readable storage medium referred to in the embodiments of the present application may be a non-volatile storage medium, in other words, a non-transitory storage medium.

It should be understood that all or part of the steps for implementing the above embodiments may be implemented by software, hardware, firmware or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The computer instructions may be stored in the computer-readable storage medium described above.

That is, in some embodiments, there is also provided a computer program product containing instructions which, when run on a computer, cause the computer to perform the steps of the horizontal well energization method described above.

It is to be understood that reference herein to "at least one" means one or more and "a plurality" means two or more. In the description of the embodiments of the present application, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in order to facilitate clear description of technical solutions of the embodiments of the present application, in the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same items or similar items having substantially the same functions and actions. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.

The above-mentioned embodiments are provided not to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A horizontal well energization method, characterized in that the method comprises:

2. The method of claim 1, wherein determining the segment spacing of the horizontal well in the target zone according to the permeability and the perforation segment length of the target zone and the correspondence between the permeability and the radius of the free-flowing zone comprises:

determining the radius of the easy flow area of the target layer according to the permeability of the target layer and the corresponding relation between the permeability and the radius of the easy flow area;

3. The method of claim 2, wherein determining the segmental spacing of the horizontal well according to the radius of the freeway zone and the length of the perforation segment comprises:

and determining the corresponding subsection interval of the corresponding perforation section according to the radius of the easily flowing area and the length of the perforation section of each perforation section in the one or more perforation sections.

4. The method of any one of claims 1-3, wherein before determining the segment spacing of the horizontal well in the target zone according to the permeability and the perforation segment length of the target zone and the correspondence between the permeability and the radius of the easy flow zone, the method further comprises:

5. The method of claim 4, wherein the plurality of stages to be constructed comprises a plurality of fracturing stages that are odd numbered stages of the plurality of stages to be constructed and a plurality of energizing stages that are even numbered stages of the plurality of stages to be constructed, or wherein the plurality of fracturing stages are even numbered stages of the plurality of stages to be constructed and the plurality of energizing stages are odd numbered stages of the plurality of stages to be constructed;

6. The method of claim 5, wherein prior to the alternating fracturing and energy storage construction of the plurality of segments to be constructed, further comprising:

7. The method according to claim 5 or 6, wherein the perforating and energy storage construction is carried out on the selected energizing section according to the perforating position and the energizing liquid injection amount corresponding to the selected energizing section, and comprises the following steps:

8. A horizontal well energization apparatus, comprising:

9. The apparatus of claim 8, wherein the plurality of stages to be constructed comprises a plurality of fracturing stages that are odd numbered stages of the plurality of stages to be constructed and a plurality of energizing stages that are even numbered stages of the plurality of stages to be constructed, or wherein the plurality of fracturing stages are even numbered stages of the plurality of stages to be constructed and the plurality of energizing stages are odd numbered stages of the plurality of stages to be constructed;

the execution module comprises:

10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.