CN105178922A - Perforation completion method used for hydraulic fracturing physical simulation test - Google Patents
Perforation completion method used for hydraulic fracturing physical simulation test Download PDFInfo
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Abstract
The invention discloses a perforation completion method used for a hydraulic fracturing physical simulation test. According to the perforation completion method, a bendable, flexible and thin-strip-shaped material stretches into a shaft, in the side surface of which, a plurality of perforations are formed, in addition, the bendable, flexible and thin-strip-shaped material is bent and stretches out at the perforations, then the shaft is put into a mould to be fixed, a prepared model material is poured into the mould, a model is maintained, the flexible and thin-strip-shaped material is pulled out when the model reaches preset strength, and the mould is disassembled, so that the model prepared in a perforation completion manner is obtained. By adopting the perforation completion method disclosed by the invention, the perforation completion is realized more conveniently and flexibly, the application range is wider, a most general spiral perforation completion manner can be realized, and in addition, soluble solid is not used in the method, so that the problem of perforation blockage is not caused, and moreover, by adopting the method, all related parameters such as perforation positions, perforation intervals, perforation diameter, perforation length and perforation phase angle can be set according to requirements.
Description
Technical field
The present invention relates to Reservoir Development technical research technical field, particularly relate to a kind of perforation completion method for fracturing physical simulation experiment.
Background technology
The Unconventional forage such as shale gas, compact sandstone gas is becoming the important object of exploration and development, and because reservoir is fine and close, permeability is low, needs to carry out effective exploitation by hydraulic fracturing technology to it.At the scene, in order to maintain the stability of the borehole wall, usually sleeve pipe well cementing of cement is first used, further enforcement perforation, perforating bullet penetrates well bore wall and thrusts reservoir certain depth, is communicated with reservoir and pit shaft, carry out fracturing on this basis, make the hydraulic fracture produced fully extend to the inside of reservoir, form artificial fisstured flow passage, effectively improve the rate of oil and gas recovery.
Can hydraulic fracture be the primary link of fracturing in the crack initiation at borehole wall place, directly have influence on follow-up fracture propagation and obtain desirable fracture pattern.Due to the existence of perforation, the stress state of Around A Borehole is very complicated, cannot by the crack initiation process of existing knowwhy accurate analysis hydraulic fracture at borehole wall place.Therefore, indoor physical simulation test becomes the important means of hydraulic fracture crack initiation under research perforation completion, for observation fracture initiation position, and then analyzes crack initiation mechanism and has important engineering significance.
At present, the existing preparation method about perforation in fracturing physical simulation experiment, its method is run through pit shaft from the side with the solid material of solubility in advance, after cast material coagulation forming, by soluble solids material dissolves out, the perforation tunnel being communicated with pit shaft and cast material is formed.Find after analyzing that this method exists certain limitation, specific as follows:
A. soluble solids is in order to be fixed on pit shaft well, wholely from the side must run through pit shaft, this can not simulate spiral perforation situation (spiral perforation require perforation only stretch out from the side of the borehole wall, and the spiral that keeps at a certain distance away is laid), and spiral perforation applies the most general perforating methods in the exploitation of current Unconventional forage.
B. part soluble solids may remain in perforation tunnel, can not be dissolved out completely, causes the obstruction of perforation, and meanwhile, the process of dissolving also compares to waste time and energy.
C. the hole quality of perforation is not easy to keep uniformity.
Summary of the invention
The application provides a kind of perforation completion method for fracturing physical simulation experiment, the preparation method solving perforation in prior art can not simulate the situation of spiral perforation, part soluble solids can remain in perforation tunnel cause the obstruction of perforation, the hole quality of perforation is not easy to keep the technical problem of uniformity.
The application provides a kind of perforation completion method for fracturing physical simulation experiment, and described perforation completion method comprises:
Make the pit shaft that side is distributed with multi-openings, described perforation penetrates the borehole wall of described pit shaft;
Bent toughness fine strip shape material is stretched into from described pit shaft one end, stretches out in the bending of described perforation place;
The described pit shaft being provided with described toughness fine strip shape material is put into mould to fix;
The cast material prepared is poured in described mould, obtains a model;
Carry out maintenance to described model, when described model reaches preset strength, withdrawing goes out described toughness fine strip shape material, removes described mould, obtains the model prepared in perforation completion mode.
Preferably, stretched into by bent toughness fine strip shape material described from described pit shaft one end, after the bending of described perforation place is stretched out, described method also comprises:
Adopt plugging material by the space shutoff between described pit shaft and described toughness fine strip shape material.
Preferably, described pit shaft can be steel pipe
Preferably, described toughness fine strip shape material is iron wire.
Preferably, described cast material is quality proportioning is 425 Portland cements: quartz sand: the material of water=1:3:0.6.
Preferably, describedly maintenance carried out to described model be specially:
Described model is placed in temperature for (20 ± 3) DEG C, relative humidity is in the care environments of more than 90%, and curing age is 28 days.
The application's beneficial effect is as follows:
The application stretches into bent toughness fine strip shape material by the pit shaft in side with multi-openings, and bent toughness fine strip shape material stretches out in the bending of described perforation place, again described pit shaft is put into mould to fix, the cast material prepared is poured in described mould, maintenance is carried out to model, when model reaches preset strength, withdrawing goes out described toughness fine strip shape material, remove mould, obtain the model prepared in perforation completion mode, this perforation completion method make perforation completion realize convenient, flexibly, the scope of application is wider, the completion mode of the most general spiral perforation can be realized, and this completion method can not adopt soluble solids, therefore, the problem that perforation blocks can not be caused, and the method can set perforating site on demand, perforation spacing, perforation diameter, perforating length, all relevant parameters such as perforation phase angle, the preparation method solving perforation in prior art can not simulate the situation of spiral perforation, part soluble solids can remain in perforation tunnel the obstruction causing perforation, the hole quality of perforation is not easy the technical problem keeping uniformity.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described by the accompanying drawing used required in describing embodiment below, apparently, the accompanying drawing in the following describes is only some embodiments of the present invention.
Fig. 1 is the method flow diagram of a kind of perforation completion method for fracturing physical simulation experiment of the application's better embodiment;
Fig. 2-Fig. 3 is the making structural representation in the perforation completion method in Fig. 1.
Detailed description of the invention
The embodiment of the present application by providing a kind of perforation completion method for fracturing physical simulation experiment, the preparation method solving perforation in prior art can not simulate the situation of spiral perforation, part soluble solids can remain in perforation tunnel cause the obstruction of perforation, the hole quality of perforation is not easy to keep the technical problem of uniformity.
Technical scheme in the embodiment of the present application is for solving the problems of the technologies described above, and general thought is as follows:
For a perforation completion method for fracturing physical simulation experiment, described perforation completion method comprises: make the pit shaft that side is distributed with multi-openings, described perforation penetrates the borehole wall of described pit shaft; Bent toughness fine strip shape material is stretched into from described pit shaft one end, stretches out in the bending of described perforation place; The described pit shaft being provided with described toughness fine strip shape material is put into mould to fix; The cast material prepared is poured in described mould, obtains a model; Carry out maintenance to described model, when described model reaches preset strength, withdrawing goes out described toughness fine strip shape material, removes described mould, obtains the model prepared in perforation completion mode.
The application stretches into bent toughness fine strip shape material by the pit shaft in side with multi-openings, and bent toughness fine strip shape material stretches out in the bending of described perforation place, again described pit shaft is put into mould to fix, the cast material prepared is poured in described mould, maintenance is carried out to model, when model reaches preset strength, withdrawing goes out described toughness fine strip shape material, remove mould, obtain the model prepared in perforation completion mode, this perforation completion method make perforation completion realize convenient, flexibly, the scope of application is wider, the completion mode of the most general spiral perforation can be realized, and this completion method can not adopt soluble solids, therefore, the problem that perforation blocks can not be caused, and the method can set perforating site on demand, perforation spacing, perforation diameter, perforating length, all relevant parameters such as perforation phase angle, the preparation method solving perforation in prior art can not simulate the situation of spiral perforation, part soluble solids can remain in perforation tunnel the obstruction causing perforation, the hole quality of perforation is not easy the technical problem keeping uniformity.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail.
In order to the preparation method solving perforation in prior art can not simulate the situation of spiral perforation, part soluble solids can remain in perforation tunnel cause the obstruction of perforation, technical problem that the hole quality of perforation is not easy to keep uniformity, the application provides a kind of perforation completion method for fracturing physical simulation experiment.As shown in Figure 1, described perforation completion method comprises the following steps:
Step S110, consults Fig. 2 and Fig. 3 simultaneously, makes the pit shaft 10 that side is distributed with multi-openings; Wherein, described perforation penetrates the borehole wall of described pit shaft 10.Described pit shaft 10 can be steel pipe, and the parameter such as quantity, diameter, position of perforation all can set as required.
Step S120, stretches into bent toughness fine strip shape material 11 from described pit shaft 10 one end, stretches out in the bending of described perforation place.Wherein, bent toughness fine strip shape material 11 should have larger tensile strength, rigidity, and not easily deform after the bending of perforation place is shaped, the length that toughness fine strip shape material 11 stretches out from perforation can change, and sets according to specific needs.It should be noted that, in order to prevent the cast material in subsequent step from entering described pit shaft along the space between pit shaft 10 and toughness fine strip shape material 11, available plugging material is by space shutoff.
Step S130, puts into mould 12 and fixes by the described pit shaft 10 being provided with described toughness fine strip shape material 11.Wherein, the putting position of described pit shaft 10 in mould 12 sets according to specific needs.
Step S140, pours into the cast material prepared in described mould 12, obtains a model.At this, the formula of cast material is determined according to specific needs.
Step S150, carries out maintenance to model, and when model reaches preset strength, withdrawing goes out described toughness fine strip shape material, removes mould, obtains the model prepared in perforation completion mode.Wherein, the curing condition (temperature, humidity etc.) for model should be determined according to the characteristic of selected cast material, and the withdrawing of fine strip shape toughness material should be selected to implement after model solidifies and reaches preset strength.
Be illustrated with regard to specific implementation process below:
First configure cast material stand-by, wherein, in the present embodiment, cast material is for choosing cement, quartz sand, and quality proportioning is 425 Portland cements: quartz sand: water=1:3:0.6.
Described perforation completion method manufacturing process is as follows:
(1) pit shaft that side is distributed with preforation tunnel is made.Choose steel pipe as wellbore materials, the internal diameter of pit shaft is 15mm, and external diameter is 20mm, and length is 660mm.Start to arrange two spiral perforations bunch respectively to pit shaft two ends at 50mm place each apart from left and right, steel pipe center, wherein, every shower hole count is 6, and phase angle is 60 °, and eye diameter is 2mm, and the center distance of adjacent eyelet is 4mm.
(2) stretched into from pit shaft one end by bent toughness fine strip shape material, at preforation tunnel place, bending is stretched out.Here, select iron wire as the material stretching into pit shaft, iron wire diameter is 1.76mm, and the extension elongation at preforation tunnel place is 30mm, direction and pit shaft axes normal, while iron wire the other end stretch out pit shaft 200mm, facilitate and follow-up withdrawing carried out to iron wire.The space glass cement shutoff that preforation tunnel place stays after stretching out iron wire.Each hole position has an iron wire to stretch out, and arranges 12 iron wires altogether, and these 12 iron wires are divided into two groups, separately corresponding two perforations bunch, often organizes iron wire and stretches out from corresponding near-end well head.
(3) pit shaft is put into mould to fix.Mould used herein is made up of 5 block plates, forming the front, rear, left and right of mould, lower 5 faces respectively, reserving above for adding cast material.Eyelet is left at the center of two little (length of side 300mm × 300mm) that mould is relative, and pit shaft can just pass from the eyelet in these two faces, is erected at the center of mould with this.
(4) cast material prepared is poured in mould.Join the material vibrating head vibration compacting in model, drive inner bubble away, finally surface is struck off.The profile of model is cuboid, and the size on three limits is respectively 300mm, 300mm, 600mm.
(5) carry out maintenance to model, when model reaches some strength, withdrawing goes out fine strip shape toughness material.According to the requirement to cement conservation, model is placed in temperature for (20 ± 3) DEG C, relative humidity is in the standard curing environment of more than 90%, and curing age is 28 days.Final setting time due to Portland cement is less than or equal to 10 hours, selects 12 hours withdrawing iron wires after sample production completes, after both having ensure that withdrawing iron wire perforation tunnel stablize intact, make again resistance during iron wire withdrawing less.
(6) remove mould, obtain the model prepared in perforation completion mode.The front, rear, left and right of mould, lower totally 5 faces are removed, obtains the model made with two shower holes completion mode.
The application stretches into bent toughness fine strip shape material by the pit shaft in side with multi-openings, and bent toughness fine strip shape material stretches out in the bending of described perforation place, again described pit shaft is put into mould to fix, the cast material prepared is poured in described mould, maintenance is carried out to model, when model reaches preset strength, withdrawing goes out described toughness fine strip shape material, remove mould, obtain the model prepared in perforation completion mode, this perforation completion method make perforation completion realize convenient, flexibly, the scope of application is wider, the completion mode of the most general spiral perforation can be realized, and this completion method can not adopt soluble solids, therefore, the problem that perforation blocks can not be caused, and the method can set perforating site on demand, perforation spacing, perforation diameter, perforating length, all relevant parameters such as perforation phase angle, the preparation method solving perforation in prior art can not simulate the situation of spiral perforation, part soluble solids can remain in perforation tunnel the obstruction causing perforation, the hole quality of perforation is not easy the technical problem keeping uniformity.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (6)
1. for a perforation completion method for fracturing physical simulation experiment, it is characterized in that, described perforation completion method comprises:
Make the pit shaft that side is distributed with multi-openings, described perforation penetrates the borehole wall of described pit shaft;
Bent toughness fine strip shape material is stretched into from described pit shaft one end, stretches out in the bending of described perforation place;
The described pit shaft being provided with described toughness fine strip shape material is put into mould to fix;
The cast material prepared is poured in described mould, obtains a model;
Carry out maintenance to described model, when described model reaches preset strength, withdrawing goes out described toughness fine strip shape material, removes described mould, obtains the model prepared in perforation completion mode.
2. perforation completion method as claimed in claim 1, is characterized in that, stretched into by bent toughness fine strip shape material described from described pit shaft one end, and after the bending of described perforation place is stretched out, described method also comprises:
Adopt plugging material by the space shutoff between described pit shaft and described toughness fine strip shape material.
3. perforation completion method as claimed in claim 1, it is characterized in that, described pit shaft can be steel pipe.
4. perforation completion method as claimed in claim 1, it is characterized in that, described toughness fine strip shape material is iron wire.
5. perforation completion method as claimed in claim 1, it is characterized in that, described cast material is quality proportioning is 425 Portland cements: quartz sand: the material of water=1:3:0.6.
6. perforation completion method as claimed in claim 1, is characterized in that, describedly carries out maintenance to described model and is specially:
Described model is placed in temperature for (20 ± 3) DEG C, relative humidity is in the care environments of more than 90%, and curing age is 28 days.
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| CN106593384A (en) * | 2016-11-29 | 2017-04-26 | 中国石油大学(北京) | Hydraulic-fracturing physical simulation method for horizontal well provided with spiral jet hole |
| CN107288589A (en) * | 2017-07-24 | 2017-10-24 | 中国石油大学(北京) | A kind of optimization method for preventing perforation from triggering casing failure |
| CN109060470A (en) * | 2018-07-10 | 2018-12-21 | 中国石油大学(北京) | A kind of hydraulic fracturing experiments test specimen of prefabricated intrinsic fracture and preparation method thereof |
| CN109740203A (en) * | 2018-12-18 | 2019-05-10 | 新疆贝肯能源工程股份有限公司 | Orientation trajectory design method for underground heat well development |
| CN110005380A (en) * | 2019-04-11 | 2019-07-12 | 中国石油大学(北京) | Heterogeneity shale Uneven Cluster perforation optimization method |
| CN112267865A (en) * | 2020-10-19 | 2021-01-26 | 中国石油大学(北京) | Fixed-area controllable staggered directional perforation horizontal well hydraulic fracturing physical simulation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105890998A (en) * | 2016-04-22 | 2016-08-24 | 中国科学院武汉岩土力学研究所 | Rock fracturing simulation test specimen with crack, preparation method for rock fracturing simulation test specimen, simulation test apparatus and simulation test method |
| CN105890998B (en) * | 2016-04-22 | 2018-08-10 | 中国科学院武汉岩土力学研究所 | Have crannied rock fracture simulation sample and preparation method, the simulation test device and method |
| CN106568637A (en) * | 2016-10-28 | 2017-04-19 | 中国石油大学(华东) | Preparation method of fixed perforation rock sample |
| CN106593384A (en) * | 2016-11-29 | 2017-04-26 | 中国石油大学(北京) | Hydraulic-fracturing physical simulation method for horizontal well provided with spiral jet hole |
| CN107288589A (en) * | 2017-07-24 | 2017-10-24 | 中国石油大学(北京) | A kind of optimization method for preventing perforation from triggering casing failure |
| CN109060470B (en) * | 2018-07-10 | 2020-07-03 | 中国石油大学(北京) | Hydraulic fracturing experiment test piece for prefabricating natural fracture and manufacturing method thereof |
| CN109060470A (en) * | 2018-07-10 | 2018-12-21 | 中国石油大学(北京) | A kind of hydraulic fracturing experiments test specimen of prefabricated intrinsic fracture and preparation method thereof |
| CN109740203A (en) * | 2018-12-18 | 2019-05-10 | 新疆贝肯能源工程股份有限公司 | Orientation trajectory design method for underground heat well development |
| CN110005380A (en) * | 2019-04-11 | 2019-07-12 | 中国石油大学(北京) | Heterogeneity shale Uneven Cluster perforation optimization method |
| CN110005380B (en) * | 2019-04-11 | 2020-08-11 | 中国石油大学(北京) | Heterogeneous shale heterogeneous clustering perforation optimization method |
| CN112267865A (en) * | 2020-10-19 | 2021-01-26 | 中国石油大学(北京) | Fixed-area controllable staggered directional perforation horizontal well hydraulic fracturing physical simulation method |
| CN112683614A (en) * | 2020-12-10 | 2021-04-20 | 重庆大学 | Sample preparation device |
| CN112539050A (en) * | 2021-01-21 | 2021-03-23 | 东北石油大学 | Combined 3D spiral perforation simulated injection device and simulation method |
| CN112539050B (en) * | 2021-01-21 | 2021-05-25 | 东北石油大学 | Combined 3D spiral perforation simulated injection device and simulation method |
| CN114992476A (en) * | 2022-06-07 | 2022-09-02 | 中国石油天然气集团有限公司 | Shaft angle adjusting frame and shaft temporary plugging simulation device |
| CN114992476B (en) * | 2022-06-07 | 2024-05-31 | 中国石油天然气集团有限公司 | Shaft angle adjusting frame and shaft temporary blocking simulation device |
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