CN106323703A - Manufacturing method of compact oil reservoir horizontal well multistage staged fracturing physical model - Google Patents
Manufacturing method of compact oil reservoir horizontal well multistage staged fracturing physical model Download PDFInfo
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- CN106323703A CN106323703A CN201510347605.2A CN201510347605A CN106323703A CN 106323703 A CN106323703 A CN 106323703A CN 201510347605 A CN201510347605 A CN 201510347605A CN 106323703 A CN106323703 A CN 106323703A
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Abstract
The invention discloses a manufacturing method of a compact oil reservoir horizontal well multistage staged fracturing physical model. The manufacturing method comprises the following steps: step one, picking an outcrop rock core; step two, washing the surface of the outcrop rock core; step three, cutting the washed outcrop rock core by a rock core cutting machine to produce a flat plate model; step four, using a linear cutting device to cut out horizontal grooves in the edges of the flat plate model produced in the step 3, wherein a metal pipeline with holes is embedded in each horizontal groove, and the holes of the metal pipeline are used to simulate the perforation conditions of a horizontal well; step five, using a linear cutting device to cut at least one vertical groove in the middle position of the flat plate model, wherein the vertical grooves and the horizontal grooves are communicated with each other; and step six, encapsulating the horizontal grooves by epoxy resin so as to simulate a horizontal well model, and filling the vertical groove with quartz sand so as to simulate a fracturing fracture model. The provided method provides a technological means for researching the permeability rule during the process of compact oil reservoir horizontal well staged fracturing development.
Description
Technical field
The present invention relates to fine and close oil exploitation physical modeling field, many particularly to a kind of compact oil reservoir horizontal well
The manufacture method of level staged fracturing physical model.
Background technology
Compact oil reservoir be reservoir porosity be less than 12%, the permeability sandstone reservoir less than 1mD, this kind causes
If close oil reservoir is without fracturing or does not use horizontal well, multilateral well, cannot output work
Industry air-flow.The external unconventional compact oil reservoir development time is up to more than 50 year, China's densification reservoir exploration
Exploitation is started late, but widely distributed, will become the core force of oil-gas mining from now on.
At present, research around compact oil reservoir both at home and abroad is concentrated mainly on reservoir study and field practice.Pin
To reservoir study, pulse air is currently mainly had to survey permeability survey, constant speed pressure hydrargyrum, high-pressure mercury, scanning
The experimental techniques such as Electronic Speculum, FBI imaging, CT imaging and nuclear magnetic resonance, NMR, scene also form horizontal well and adds
Massive hydraulic fracturing development technique.Although achieving some empirical understanding in the studies above, but for
The percolation law research of compact oil reservoir fractured horizontal well exploitation is little, seriously constrains such technology at such
Application in oil reservoir.
Research for compact oil reservoir horizontal well multistage subsection pressure break uses numerical simulation to carry out mostly, it is thus achieved that
Some theoretic understanding, but there is larger difference with oil reservoir practical situation.Also scholar is had to use one-dimensional rock
Excess of the heart tests the study mechanism carried out under some simple fracture conditions, it is thus achieved that compact rock core seepage flow characteristics
Visual understanding.But, simple fracture conditions can not Efficient Characterization compact oil reservoir horizontal well multistage subsection pressure break
Condition.Use two-dimentional or three-dimensional large-sized physical simulating device, carry out compact oil reservoir staged fracturing of horizontal well and grind
Study carefully and become development trend.
But, owing to fracture conditions is complicated, at present on there is no a kind of compact oil reservoir staged fracturing of horizontal well thing
The manufacture method of reason model.
The information being disclosed in this background section is merely intended to increase the reason of the general background to the present invention
Solve, and be not construed as recognizing or imply in any form that this information structure is for this area general technology
Prior art well known to personnel.
Summary of the invention
It is an object of the invention to provide the system of a kind of compact oil reservoir horizontal well multistage subsection pressure break physical model
Make method, on the basis of two-dimensional flat plate model, establish one and can simulate varying level well segmentation pressure
Split the physical model manufacture method of condition, in research compact oil reservoir staged fracturing of horizontal well development process
Percolation law provides technological means.
For achieving the above object, the invention provides a kind of compact oil reservoir horizontal well multistage subsection pressure break physics
The manufacture method of model, comprises the steps: step 1, chooses rock core of appearing；Step 2, to step 1
In the surface of rock core of appearing be carried out；Step 3, uses rock by rock core of appearing cleaned in step 2
The cutting of anxious cutting mill is fabricated to flat plate model；Step 4, uses the flat board that line sickle makes in step 3
Cutting out lateral trench at the sideline of model, lateral trench is embedded with the metal pipe line of eye, metal tube
The perforating condition of the eyelet dummy level well of line；Step 5, uses line sickle flat board mould in step 4
The centre position of type cuts out at least one longitudinal groove, and longitudinal groove connects with lateral trench；And step
Rapid 6, utilize epoxide-resin glue encapsulation lateral trench to carry out dummy level well model, to filled stone in longitudinal groove
Sand simulates fracturing fracture model.
Preferably, in step 1, according to the geologic feature phase of target reservoir conditional filtering with target reservoir
Near rock core of appearing.
Preferably, choose appear rock core time, first alternative core sample is drilled through core column some, and
Measure the core porosity of these some core column, permeability and parameter of pore structure, pick out and target oil
Hide core sample corresponding to the close core column of rock core character as rock core of appearing.
Preferably, after continuing 24 hours in core column calorstat more than 100 DEG C, cooling processes again, treats
Its core porosity, permeability and parameter of pore structure is measured again after core column cooling.
Preferably, in step 3, the size of flat plate model is 40cm × 40cm × 2.7cm.
Preferably, use organic solvent to be carried out after having made flat plate model, and high temperature drying is dried in the air cool.
Preferably, cutting lateral trench at the sideline 1cm of flat plate model, a diameter of 1cm of lateral trench,
The a length of 40cm of lateral trench.
Preferably, when needs simulation limited fluid diversion fractured model, to directly filling difference in longitudinal groove
The quartz sand of mesh number；When needs simulation infinite fluid diversion fractured model, place and it in first giving longitudinal groove
The foil that length is identical, then gives in the space between longitudinal groove and foil and fills 60～70 mesh
Quartz sand.
Preferably, before utilizing epoxide-resin glue encapsulation lateral trench, first give the top capping gold of lateral trench
Belong to sheet.
Compared with prior art, there is advantages that the compact oil reservoir water by the present invention
The compact oil reservoir staged fracturing of horizontal well physics that the manufacture method of horizontal well multistage subsection pressure break physical model obtains
Model, the elastic exploitation carried out and CO2Handle up experiment, simulate the pressure during each the most well
The regularity of distribution, it is possible to the seepage flow characteristics after guide compact oil reservoir staged fracturing of horizontal well recognizes and opens
Bristle with anger mark Changing Pattern, for research compact oil reservoir staged fracturing of horizontal well, CO2Handle up and provide technological means.
Accompanying drawing explanation
Fig. 1 is that the horizontal well of middle plateform model of the present invention makes schematic diagram；
Fig. 2 is that the fracturing fracture of middle plateform model of the present invention makes schematic diagram；
Fig. 3 is the well pattern form schematic diagram of North China Oilfield compact oil reservoir staged fracturing of horizontal well；
Fig. 4 is the fractured horizontal well model schematic of high fracture spacing in the present invention (3 seam)；
Fig. 5 is the fractured horizontal well model schematic of middle fracture spacing in the present invention (2 seam)；
Fig. 6 is the fractured horizontal well model schematic of low fracture spacing in the present invention (1 seam)；
Fig. 7 is the pressure-plotting of compact rock core fractured horizontal well model elasticity exploitation in the present invention；
Fig. 8 is compact rock core fractured horizontal well MODEL C O in the present invention2" gulp down " pressure process in handling up to divide
Butut；
Fig. 9 is compact rock core fractured horizontal well MODEL C O in the present invention2" tell " pressure process in handling up to divide
Butut.
Main Reference Numerals illustrates:
1-lateral trench, 2-longitudinal groove.
Detailed description of the invention
Below in conjunction with the accompanying drawings, the detailed description of the invention of the present invention is described in detail, it is to be understood that this
The protection domain of invention is not limited by detailed description of the invention.
Explicitly indicate that unless otherwise other, otherwise in entire disclosure and claims, term " bag
Include " or its conversion as " comprising " or " including " etc. will be understood to comprise stated element or
Ingredient, and do not get rid of other element or other ingredient.
A kind of compact oil reservoir horizontal well multistage subsection pressure break physical model according to the specific embodiment of the invention
Manufacture method, comprise the steps:
Step 1, chooses rock core of appearing；
Step 2, is carried out the surface of the rock core of appearing in step 1；
Step 3, uses core cutter cutting to be fabricated to flat board mould in rock core of appearing cleaned in step 2
Type；
Step 4, cuts out horizontal ditch at the sideline of the flat plate model that utilization line sickle makes in step 3
Groove 1 (seeing Fig. 1), lateral trench 1 is embedded with the metal pipe line (not shown) of eye, metal
The perforating condition of the eyelet dummy level well of pipeline；
Step 5, uses the centre position of line sickle flat plate model in step 4 to cut out at least one
Longitudinal groove 2 (seeing Fig. 2), longitudinal groove 2 connects with lateral trench 1；And
Step 6, utilizes epoxide-resin glue encapsulation lateral trench 1 to carry out dummy level well model, to longitudinal groove
In 2, filled stone sand simulates fracturing fracture model.
As a kind of preferred embodiment, in step 1, according to target reservoir conditional filtering and target reservoir
The close rock core of appearing of geologic feature.
As a kind of preferred embodiment, choose appear rock core time, first alternative core sample is drilled through rock
Stem is some, and measures the core porosity of these some core column, permeability and parameter of pore structure, chooses
Select core sample corresponding to the core column close with target reservoir rock core character as rock core of appearing.The most just
Being to say, the present embodiment provides a kind of method preferably choosing rock core of appearing, the most alternative some northerns Shensi length 6
The tight sand outcrop samples (abbreviation core sample) of reservoir, drills through core column respectively some, then uses
The organic solvent such as toluene, carbon tetrachloride cleans core column.As a kind of preferred embodiment, core column is existed
After continuing 24 hours in the calorstat of more than 100 DEG C, cooling processes again, measures it again after core column cools down
Core porosity, permeability and parameter of pore structure, then pick out and target reservoir according to these parameters
The core column that rock core character is close, the tight sand outcrop samples corresponding with core column is as making model
Appear rock core.
As a kind of preferred embodiment, in step 3, the size of flat plate model be 40cm × 40cm ×
2.7cm。
As a kind of preferred embodiment, organic solvent is used to be carried out after having made flat plate model, and
High temperature drying is dried in the air cool.
As a kind of preferred embodiment, at the sideline 1cm of flat plate model, cut lateral trench 1, horizontal ditch
A diameter of 1cm of groove 1, a length of 40cm of lateral trench 1.
In such scheme, when needs simulation limited fluid diversion fractured model, to direct in longitudinal groove 2
Fill the quartz sand of different meshes；When needs simulation infinite fluid diversion fractured model, first give longitudinal groove 2
The foil that interior placement is identical with its length, then gives in the space between longitudinal groove 2 and foil
Fill the quartz sand of 60～70 mesh.
According to the existing result of study to compact oil reservoir horizontal well multistage subsection pressure break, actual according to oil reservoir
Situation, staged fracturing of horizontal well crack can be divided into limited fluid diversion crack and infinite fluid diversion crack.Wherein, exist
In the present embodiment, use above-mentioned in longitudinal groove 2 direct filled stone sand to simulate limited fluid diversion crack
Model.Or the method for the quartz sand of filling 60～70 mesh carrys out mould after longitudinal groove 2 is inserted into foil
Intend infinite fluid diversion fractured model.
As a kind of preferred embodiment, before utilizing epoxide-resin glue encapsulation lateral trench 1, first give horizontal ditch
The top capping sheet metal of groove 1.The purpose of capping sheet metal is exactly isolated groove and top loop epoxy resins,
Prevent epoxy resin from entering groove, contaminant water horizontal well section.
It should be noted that in practice, the such as well of North China Oilfield compact oil reservoir staged fracturing of horizontal well
Net form state 10 is as it is shown on figure 3, be dispersed with the fracturing fracture 102 of different hop count at horizontal well 102 along journey.
When making model, need to carry out the board design in multistage fracturing crack, simultaneously as experimental model geometry
Size needs with experiment, can not directly simulate whole well pattern on a model.Therefore, in whole well pattern
On have selected subregion and test as simulated object, in Fig. 3, tab area is exactly the simulation of model
Unit 12.
As shown in Figures 4 to 6, according to the performance of target reservoir staged fracturing of horizontal well, in conjunction with phase
Like criterion, use above-mentioned horizontal well and fracturing fracture manufacture method, carry out mock up flat length horizontal's well section right
The different pressure break hop counts answered or the horizontal well multistage subsection pressure break physical model of fracture spacing condition.Wherein Fig. 4
For the fractured horizontal well model schematic of low fracture spacing (1 seam), Fig. 5 be middle fracture spacing (2
Seam) fractured horizontal well model schematic, Fig. 6 is the fractured horizontal well mould of high fracture spacing (3 seam)
Type schematic diagram.
In the case of providing above-mentioned physical model for compact oil reservoir staged fracturing of horizontal well physical modeling,
On combination model, the different pressure taps of distribution, can study the seepage flow machine under the conditions of staged fracturing of horizontal well
Reason, and the method for gas injection suggestions for improvement.
Below as a example by certain oil field reservoir condition, reservoir temperature is 65 DEG C, and original formation pressure is 18MPa,
Simulate in oil reservoir elasticity recovery process and CO2Pressure law during handling up (sees Fig. 7 to figure
9)。
It can be seen that Fig. 7 is that the compact rock core horizontal well under the conditions of 2 cracks is many from Fig. 7 to Fig. 9
Pressure-plotting in level segmentation Pressure breaking bullet recovery process.Obviously, after elastic exploitation terminates, horizontal well
There is certain low-pressure area in the immediate area in section and crack, less in the drop of pressure situation of far-end.
Fig. 8 is CO2The distribution situation of pressure during swallowing.At CO2After injection, at net horizontal section and
The region that crack is nearer, pressure rising condition is obvious.Wherein, the pressure near horizontal well heel end rises
Situation toe-end to be significantly better than and model far-end situation.
Fig. 9 is CO2Pressure distribution situation during telling.Obviously, CO2After discharge, horizontal well and splitting
The drop of pressure of seam immediate area will be big, and remote area pressure is higher.
Use the compact oil reservoir staged fracturing of horizontal well physical model that above-mentioned physical model manufacture method obtains,
The elastic exploitation carried out and CO2Handle up experiment, simulate the pressure distribution rule during each the most well
Rule, it is possible to the seepage flow characteristics understanding after guide compact oil reservoir staged fracturing of horizontal well and development index
Changing Pattern, for research compact oil reservoir staged fracturing of horizontal well, CO2Handle up and provide technological means.
The aforementioned description to the specific illustrative embodiment of the present invention illustrates that and the purpose of illustration.
These descriptions are not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to above-mentioned
Teaching, can much change and change.The purpose selected exemplary embodiment and describe exists
In explaining the certain principles of the present invention and actual application thereof, so that those skilled in the art can be real
Now and utilize the various different exemplary of the present invention and various different selection and change.
The scope of the present invention is intended to be limited by claims and equivalents thereof.
Claims (9)
1. the manufacture method of a compact oil reservoir horizontal well multistage subsection pressure break physical model, it is characterised in that
Comprise the steps:
Step 1, chooses rock core of appearing；
Step 2, is carried out the surface of the rock core of appearing in described step 1；
Step 3, uses core cutter cutting to be fabricated to put down in rock core of appearing cleaned in described step 2
Slab；
Step 4, cuts out horizontal stroke at the sideline of the flat plate model that utilization line sickle makes in described step 3
To groove, described lateral trench is embedded with the metal pipe line of eye, the eyelet simulation of described metal pipe line
The perforating condition of horizontal well；
Step 5, uses the centre position of line sickle flat plate model in described step 4 to cut out at least
Article one, longitudinal groove, described longitudinal groove connects with described lateral trench；And
Step 6, utilizes epoxide-resin glue to encapsulate described lateral trench and carrys out dummy level well model, to described vertical
In groove, filled stone sand simulates fracturing fracture model.
The making of compact oil reservoir horizontal well multistage subsection pressure break physical model the most according to claim 1
Method, it is characterised in that in described step 1, according to target reservoir conditional filtering and target reservoir
What geologic feature was close appear rock core.
The making of compact oil reservoir horizontal well multistage subsection pressure break physical model the most according to claim 2
Method, it is characterised in that choose appear rock core time, if first alternative core sample being drilled through core column
Dry, and measure the core porosity of these some core column, permeability and parameter of pore structure, pick out with
Core sample corresponding to core column that target reservoir rock core character is close is as rock core of appearing.
The making of compact oil reservoir horizontal well multistage subsection pressure break physical model the most according to claim 3
Method, it is characterised in that the coldest after continuing 24 hours in described core column calorstat more than 100 DEG C
But process, after described core column cools down, measure its core porosity, permeability and parameter of pore structure again.
The making of compact oil reservoir horizontal well multistage subsection pressure break physical model the most according to claim 1
Method, it is characterised in that in described step 3, the size of flat plate model is 40cm × 40cm × 2.7cm.
The making of compact oil reservoir horizontal well multistage subsection pressure break physical model the most according to claim 5
Method, it is characterised in that use organic solvent to be carried out after having made described flat plate model, and high
Temperature drying is dried in the air cool.
The making of compact oil reservoir horizontal well multistage subsection pressure break physical model the most according to claim 1
Method, it is characterised in that cut described lateral trench, described horizontal stroke at the sideline 1cm of described flat plate model
To a diameter of 1cm of groove, a length of 40cm of described lateral trench.
The making of compact oil reservoir horizontal well multistage subsection pressure break physical model the most according to claim 1
Method, it is characterised in that when needs simulation limited fluid diversion fractured model, to straight in described longitudinal groove
Connect the quartz sand filling different meshes；
When needs simulation infinite fluid diversion fractured model, place and its length phase in first giving described longitudinal groove
Same foil, then gives in the space between described longitudinal groove and described foil and fills 60～70
Purpose quartz sand.
The making of compact oil reservoir horizontal well multistage subsection pressure break physical model the most according to claim 1
Method, it is characterised in that before utilizing epoxide-resin glue to encapsulate described lateral trench, first gives described horizontal ditch
The top capping sheet metal of groove.
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| CN106837259A (en) * | 2017-04-01 | 2017-06-13 | 吉林大学 | A kind of ocean shallow layer gas hydrate micro-pipe increasing device and method |
| CN107831051A (en) * | 2017-01-19 | 2018-03-23 | 中国石油化工股份有限公司 | The natural core in simulation compact oil reservoir artificial fracturing crack makes seam method |
| CN113189677A (en) * | 2021-04-22 | 2021-07-30 | 西南石油大学 | Automatic updating method of three-dimensional oil reservoir physical property parameter model |
| CN114464067A (en) * | 2022-03-08 | 2022-05-10 | 西南石油大学 | Multi-scale net-sewing experimental device and experimental method thereof |
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