CN106323703B - The production method of compact oil reservoir horizontal well multistage subsection pressure break physical model - Google Patents
The production method of compact oil reservoir horizontal well multistage subsection pressure break physical model Download PDFInfo
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- CN106323703B CN106323703B CN201510347605.2A CN201510347605A CN106323703B CN 106323703 B CN106323703 B CN 106323703B CN 201510347605 A CN201510347605 A CN 201510347605A CN 106323703 B CN106323703 B CN 106323703B
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Abstract
The invention discloses a kind of production methods of compact oil reservoir horizontal well multistage subsection pressure break physical model, include the following steps: step 1, choose rock core of appearing；Step 2, the surface for rock core of appearing is cleaned；Step 3, cleaned rock core of appearing is fabricated to flat plate model with core cutter cutting；Step 4, lateral trench is cut at the sideline of the flat plate model made in step 3 with wire cutting device, lateral trench is embedded with the metal pipe line of eyelet, the perforating condition of the eyelet dummy level well of metal pipe line；Step 5, the middle position of the flat plate model with wire cutting device in step 4 is cut at least one longitudinal groove, and longitudinal groove is connected to lateral trench；And step 6, lateral trench is encapsulated come dummy level well model using epoxide-resin glue, simulates fracturing fracture model to quartz sand is filled in longitudinal groove.This method provides technological means for the percolation law in research compact oil reservoir horizontal well fracturing development process.
Description
Technical field
The present invention relates to fine and close oil exploitation physical analogy field, in particular to a kind of compact oil reservoir horizontal well multistage subsection pressures
Split the production method of physical model.
Background technique
Compact oil reservoir is the sandstone reservoir that reservoir porosity is less than 1mD lower than 12%, permeability, if this kind of compact oil reservoir
Horizontal well, multilateral well are not either used without hydraulic fracturing, it cannot output industrialness air-flow.External unconventional densification
The oil reservoir development time is up to more than 50 years, and China's densification reservoir exploration and development is started late, but widely distributed, will become oily from now on
The core force of gas exploitation.
Currently, being concentrated mainly on reservoir study and field practice around the research of compact oil reservoir both at home and abroad.It is ground for reservoir
Study carefully, mainly have at present pulse air survey permeability survey, constant speed pressure mercury, high-pressure mercury, scanning electron microscope, FBI imaging, CT imaging and
The experimental techniques such as nuclear magnetic resonance, scene also form horizontal well enlarged fracturing developing technology.Although being obtained in the studies above
Some empirical understanding, but seldom for the percolation law research of compact oil reservoir fractured horizontal well exploitation, serious restriction
Application of such technology in such oil reservoir.
It mostly uses numerical simulation to carry out greatly the research of compact oil reservoir horizontal well multistage subsection pressure break, obtains some theories
On understanding, but there are larger differences with oil reservoir actual conditions.Some scholars have carried out some simple with one-dimensional core experiment
Mechanism study under fracture conditions obtains the visual understanding of compact rock core seepage flow characteristics.However, simple fracture conditions cannot have
Effect characterization compact oil reservoir horizontal well multistage subsection pressure break condition.With two dimension or three-dimensional large-sized physical simulating device, carry out fine and close
Reservoir horizontal well staged fracturing research becomes development trend.
But due to fracture conditions complexity, a kind of no compact oil reservoir horizontal well fracturing physical model is gone up at present
Production method.
The information disclosed in the background technology section is intended only to increase the understanding to general background of the invention, without answering
When being considered as recognizing or imply that the information constitutes the prior art already known to those of ordinary skill in the art in any form.
Summary of the invention
The purpose of the present invention is to provide a kind of production method of compact oil reservoir horizontal well multistage subsection pressure break physical model,
On the basis of two-dimensional flat plate model, a kind of physical model production that can simulate different level well staged fracturing condition is established
Method provides technological means for the percolation law in research compact oil reservoir horizontal well fracturing development process.
To achieve the above object, the present invention provides a kind of systems of compact oil reservoir horizontal well multistage subsection pressure break physical model
Make method, include the following steps: step 1, chooses rock core of appearing；Step 2, the surface of the rock core of appearing in step 1 is carried out clear
It washes；Step 3, rock core of appearing cleaned in step 2 is fabricated to flat plate model with core cutter cutting；Step 4, it uses
Lateral trench is cut at the sideline for the flat plate model that wire cutting device makes in step 3, lateral trench is embedded with eyelet
Metal pipe line, the perforating condition of the eyelet dummy level well of metal pipe line；Step 5, the plate with wire cutting device in step 4
The middle position of model is cut at least one longitudinal groove, and longitudinal groove is connected to lateral trench；And step 6, utilize ring
Oxygen resin glue encapsulation lateral trench carrys out dummy level well model, simulates fracturing fracture mould to quartz sand is filled in longitudinal groove
Type.
Preferably, in step 1, it is appeared according to similar in the geologic feature of target reservoir conditional filtering and target reservoir rock
The heart.
Preferably, when rock core is appeared in selection, it is several that core column first is drilled through to alternative core sample, and it is several to measure this
Core porosity, permeability and the parameter of pore structure of core column are picked out and core column similar in target reservoir rock core property
Corresponding core sample is as rock core of appearing.
Preferably, cooling treatment again after core column continues 24 hours in 100 DEG C or more of insulating box, it is cooling to core column
Measure its core porosity, permeability and parameter of pore structure again afterwards.
Preferably, in step 3, the size of flat plate model is 40cm × 40cm × 2.7cm.
Preferably, it is cleaned after having made flat plate model with organic solvent, and high temperature drying cools down.
Preferably, lateral trench is cut at the sideline 1cm of flat plate model, the diameter of lateral trench is 1cm, lateral trench
Length is 40cm.
Preferably, when needing to simulate limited fluid diversion fractured model, to the stone for directly filling different meshes in longitudinal groove
Sand；When needing to simulate infinite fluid diversion fractured model, first to sheet metal identical with its length is placed in longitudinal groove, so
Afterwards to the quartz sand for filling 60~70 mesh in the gap between longitudinal groove and sheet metal.
Preferably, before encapsulating lateral trench using epoxide-resin glue, sheet metal first is covered to the top of lateral trench.
Compared with prior art, the invention has the following beneficial effects: compact oil reservoir horizontal well through the invention is multistage
The compact oil reservoir horizontal well fracturing physical model that the production method of staged fracturing physical model obtains, the elasticity exploitation of progress
And CO2Handle up experiment, simulate well it is each during pressure law, being capable of guide compact oil reservoir water
After horizontal well staged fracturing seepage flow characteristics understanding and development index changing rule, for research compact oil reservoir horizontal well fracturing,
CO2It handles up and provides technological means.
Detailed description of the invention
Fig. 1 is the horizontal well production schematic diagram of flat plate model in the present invention；
Fig. 2 is the fracturing fracture production schematic diagram of flat plate model in the present invention；
Fig. 3 is the well pattern form schematic diagram of North China Oilfield compact oil reservoir horizontal well fracturing；
Fig. 4 is the fractured horizontal well model schematic of high fracture spacing (3 seams) in the present invention；
Fig. 5 is the fractured horizontal well model schematic of middle fracture spacing (2 seams) in the present invention；
Fig. 6 is the fractured horizontal well model schematic of low fracture spacing (1 seam) in the present invention；
Fig. 7 is the pressure-plotting that compact rock core fractured horizontal well model elasticity is exploited in the present invention；
Fig. 8 is compact rock core fractured horizontal well MODEL C O in the present invention2Pressure process distribution map " is gulped down " in handling up；
Fig. 9 is compact rock core fractured horizontal well MODEL C O in the present invention2Pressure process distribution map " is spat " in handling up.
Main appended drawing reference explanation:
1- lateral trench, 2- longitudinal groove.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in detail, it is to be understood that guarantor of the invention
Shield range is not limited by the specific implementation.
Unless otherwise explicitly stated, otherwise in entire disclosure and claims, term " includes " or its change
Changing such as "comprising" or " including " etc. will be understood to comprise stated element or component, and not exclude other members
Part or other component parts.
The production of a kind of compact oil reservoir horizontal well multistage subsection pressure break physical model of specific embodiment according to the present invention
Method includes the following steps:
Step 1, rock core of appearing is chosen；
Step 2, the surface of the rock core of appearing in step 1 is cleaned；
Step 3, rock core of appearing cleaned in step 2 is fabricated to flat plate model with core cutter cutting；
Step 4, be cut at the sideline of the flat plate model made in step 3 with wire cutting device lateral trench 1 (referring to
Fig. 1), lateral trench 1 is embedded with the metal pipe line (not shown) of eyelet, and the eyelet dummy level well of metal pipe line is penetrated
Hole condition；
Step 5, the middle position of the flat plate model with wire cutting device in step 4 is cut at least one longitudinal groove
2 (referring to fig. 2), longitudinal groove 2 are connected to lateral trench 1；And
Step 6, lateral trench 1 is encapsulated come dummy level well model, to filled stone in longitudinal groove 2 using epoxide-resin glue
Sand simulates fracturing fracture model.
As a kind of preferred embodiment, in step 1, according to the geologic feature of target reservoir conditional filtering and target reservoir
Similar rock core of appearing.
As a kind of preferred embodiment, when rock core is appeared in selection, it is several that core column first drilled through to alternative core sample,
And core porosity, permeability and the parameter of pore structure of several core columns are measured, it picks out and target reservoir rock core property
The corresponding core sample of similar core column is as rock core of appearing.That is, the present embodiment provides a kind of preferred choose to reveal
The method of head rock core, such as the tight sand outcrop samples (abbreviation core sample) of alternative several northern Shensi Chang-6 reservoirs, drill through respectively
Core column is several, then cleans core column with organic solvents such as toluene, carbon tetrachloride.As a kind of preferred embodiment, by rock
Cooling treatment again after stem continues 24 hours in 100 DEG C or more of insulating box measures its rock core hole after core column is cooling again
Then porosity, permeability and parameter of pore structure are picked out and rock core similar in target reservoir rock core property according to these parameters
Column, appear rock core of the tight sand outcrop samples corresponding with core column as production model.
As a kind of preferred embodiment, in step 3, the size of flat plate model is 40cm × 40cm × 2.7cm.
It as a kind of preferred embodiment, is cleaned after having made flat plate model with organic solvent, and high temperature is dried
It cools down.
As a kind of preferred embodiment, lateral trench 1 is cut at the sideline 1cm of flat plate model, the diameter of lateral trench 1 is
1cm, the length of lateral trench 1 are 40cm.
In the above scheme, when needing to simulate limited fluid diversion fractured model, to directly filling different mesh in longitudinal groove 2
Several quartz sand；When needing to simulate infinite fluid diversion fractured model, first to placement metal identical with its length in longitudinal groove 2
Thin slice, then to the quartz sand for filling 60~70 mesh in the gap between longitudinal groove 2 and sheet metal.
According to the existing result of study to compact oil reservoir horizontal well multistage subsection pressure break, according to oil reservoir actual conditions, water
Horizontal well staged fracturing crack can be divided into limited fluid diversion crack and infinite fluid diversion crack.Wherein, in the present embodiment, with it is above-mentioned
Quartz sand is filled in longitudinal groove 2 directly to simulate limited fluid diversion fractured model.Or in longitudinal groove 2 after insertion sheet metal
The method of the quartz sand of 60~70 mesh is filled to simulate infinite fluid diversion fractured model.
As a kind of preferred embodiment, before encapsulating lateral trench 1 using epoxide-resin glue, the top of lateral trench 1 is first given
Cover sheet metal.The purpose for covering sheet metal is exactly isolated groove and top epoxy resin, prevents epoxy resin from entering groove, dirty
Contaminate net horizontal section.
It should be noted that in practice, such as the well pattern form 10 of North China Oilfield compact oil reservoir horizontal well fracturing
As shown in figure 3, the fracturing fracture 102 of different number of segment is dispersed with along journey in horizontal well 102.When making model, need to carry out multistage
The board design of fracturing fracture, simultaneously as experimental model geometric dimension and experiment need, it cannot direct mould on a model
Intend entire well pattern.Therefore, partial region has been selected to be tested as simulated object in entire well pattern, tab area in Fig. 3
It is exactly the analogue unit 12 of model.
As shown in Figures 4 to 6, it is used according to the performance of target reservoir horizontal well fracturing in conjunction with similarity criterion
Above-mentioned horizontal well and fracturing fracture production method, carry out the corresponding different pressure break number of segment of mock up flat length horizontal's well section or crack is close
The horizontal well multistage subsection pressure break physical model of degree condition.Wherein Fig. 4 is that the fractured horizontal well model of low fracture spacing (1 seam) shows
It is intended to, Fig. 5 is the fractured horizontal well model schematic of middle fracture spacing (2 seams), and Fig. 6 is the water of high fracture spacing (3 seams)
Horizontal well fracturing model schematic diagram.
In the case where providing above-mentioned physical model for compact oil reservoir horizontal well fracturing physical analogy, in binding model
The different pressure taps of upper distribution, can study seepage flow mechanism and gas injection under the conditions of horizontal well fracturing improves exploitation
The method of effect.
Below by taking certain oil field reservoir condition as an example, reservoir temperature is 65 DEG C, original formation pressure 18MPa, simulates oil reservoir
In elastic recovery process and CO2Pressure law during handling up is (referring to Fig. 7 to Fig. 9).
As can be seen that Fig. 7 is the compact rock core horizontal well multistage subsection Pressure breaking bullet under the conditions of 2 cracks in from Fig. 7 to Fig. 9
Pressure-plotting in property recovery process.Obviously, after elasticity exploitation, the immediate area in net horizontal section and crack exists certain
Low-pressure area, drop of pressure situation at the far end is smaller.
Fig. 8 is CO2The distribution situation of pressure during swallowing.In CO2After injection, in the closer area of net horizontal section and crack
Domain, pressure rise situation are obvious.Wherein, it is remote significantly better than toe-end and model to rise situation for the pressure near horizontal well heel end
Hold situation.
Fig. 9 is CO2Pressure distribution situation during spitting.Obviously, CO2After discharge, the pressure of horizontal well and crack immediate area
Power landing will be big, and remote area pressure is higher.
The compact oil reservoir horizontal well fracturing physical model obtained with above-mentioned physical model production method, the bullet of progress
Property exploitation and CO2Handle up experiment, simulate well it is each during pressure law, can guide it is fine and close
Seepage flow characteristics understanding and development index changing rule after reservoir horizontal well staged fracturing, to study compact oil reservoir horizontal well in segments
Pressure break, CO2It handles up and provides technological means.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (9)
1. a kind of production method of compact oil reservoir horizontal well multistage subsection pressure break physical model, which is characterized in that including walking as follows
It is rapid:
Step 1, rock core of appearing is chosen；
Step 2, the surface of the rock core of appearing in the step 1 is cleaned；
Step 3, rock core of appearing cleaned in the step 2 is fabricated to flat plate model with core cutter cutting；
Step 4, lateral trench is cut at the sideline of the flat plate model made in the step 3 with wire cutting device, it is described
Lateral trench is embedded with the metal pipe line of eyelet, the perforating condition of the eyelet dummy level well of the metal pipe line；
Step 5, the middle position of the flat plate model with wire cutting device in the step 4 is cut at least one longitudinal ditch
Slot, the longitudinal groove are connected to the lateral trench；And
Step 6, the lateral trench is encapsulated come dummy level well model, to filling in the longitudinal groove using epoxide-resin glue
Quartz sand simulates fracturing fracture model；
Step 7, different pressure taps is distributed in the Model of Horizontal Well or fracturing fracture model.
2. the production method of compact oil reservoir horizontal well multistage subsection pressure break physical model according to claim 1, feature
It is, in the step 1, rock core of being appeared according to similar in the geologic feature of target reservoir conditional filtering and target reservoir.
3. the production method of compact oil reservoir horizontal well multistage subsection pressure break physical model according to claim 2, feature
It is, when rock core is appeared in selection, first drills through that core column is several to alternative core sample, and measure the rock of several core columns
Heart porosity, permeability and parameter of pore structure pick out rock core corresponding with core column similar in target reservoir rock core property
Sample is as rock core of appearing.
4. the production method of compact oil reservoir horizontal well multistage subsection pressure break physical model according to claim 3, feature
It is, cooling treatment again after the core column continues 24 hours in 100 DEG C or more of insulating box, after the core column is cooling
Its core porosity, permeability and parameter of pore structure are measured again.
5. the production method of compact oil reservoir horizontal well multistage subsection pressure break physical model according to claim 1, feature
It is, in the step 3, the size of flat plate model is 40cm × 40cm × 2.7cm.
6. the production method of compact oil reservoir horizontal well multistage subsection pressure break physical model according to claim 5, feature
It is, is cleaned after having made the flat plate model with organic solvent, and high temperature drying cools down.
7. the production method of compact oil reservoir horizontal well multistage subsection pressure break physical model according to claim 1, feature
It is, the lateral trench is cut at the sideline 1cm of the flat plate model, and the diameter of the lateral trench is 1cm, the transverse direction
The length of groove is 40cm.
8. the production method of compact oil reservoir horizontal well multistage subsection pressure break physical model according to claim 1, feature
It is, when needing to simulate limited fluid diversion fractured model, to the quartz sand for directly filling different meshes in the longitudinal groove；
When needing to simulate infinite fluid diversion fractured model, first to placement metal foil identical with its length in the longitudinal groove
Piece, then to the quartz sand for filling 60~70 mesh in the gap between the longitudinal groove and the sheet metal.
9. the production method of compact oil reservoir horizontal well multistage subsection pressure break physical model according to claim 1, feature
It is, before encapsulating the lateral trench using epoxide-resin glue, first covers sheet metal to the top of the lateral trench.
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| 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 |
| CN106837259B (en) * | 2017-04-01 | 2023-02-17 | 吉林大学 | Device and method for increasing yield of marine shallow natural gas hydrate microtubules |
| CN113189677B (en) * | 2021-04-22 | 2022-05-31 | 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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