CN102053026B - Material and method for manufacturing carbonate cave oil reservoir physical model - Google Patents
Material and method for manufacturing carbonate cave oil reservoir physical model Download PDFInfo
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Abstract
The invention relates to a material and a method for manufacturing a carbonate cave oil reservoir physical model. The material is characterized by comprising a manufacturing main body material for cracks and caves in the physical model and a physical model skeleton material, wherein the manufacturing main body material for cracks and caves in the physical model is selected from wood's alloy and/or paraffin. The method comprises the following steps of: 1) manufacturing models of caves and cracks of different sizes and shapes by using the wood's alloy and/or the paraffin; and 2) after the models are formed, displacing the wood's alloy and/or the paraffin at the temperature of higher than 85 DEG C to obtain a crack cave with spatial structure. The manufactured physical model accords with the characteristics of carbonate cave oil reservoir and supplies reliable guarantee for developing various physical simulation experiments.
Description
Technical field
The present invention relates to oil-gas field development field physical model used and physical simulation experiment, specifically make material and the method for making of carbonate cave oil reservoir physical model.
Background technology
Carbonate rock fractured cave type hydrocarbon-bearing pool is that the important resource of China is taken over position and strategic direction.But because its structure, reservoir, oil water relation etc. are very complicated, many difficult problems are run on stream.Main manifestations is: the fine description difficulty of reservoir and the fluid regularity of distribution is large; Seam hole system production capacity, product water, energy changing characteristics complexity; The method of artificial supplementation energy and technical measures are difficult to determine; Oil-water well well stimulation and raising recovery efficiency technique difficulty are large etc.
Reservoir physical simulation is to be based upon on similarity theory basis, creates artificially an environment, and the experimental technique by strict program to the simulation of oil reservoir development process implementation, is the important technical of carrying out reservoir engineering and development technique research.Building physical model is the core of carrying out reservoir physical simulation experiment.Physical model is the basis of reservoir physical simulation experiment.Suitable experimental physics model is prerequisite and the basis of carrying out accurate reservoir characterization, reservoir engineering and development experiments research, is also key link and the gordian technique that guarantees these result of study accuracys.
Due to the complicacy of fracture and vug carbonate reservoir, there are the polytype Reservoir Bodies such as slit formation, Caves, pore type, crack-Caves, pore pattern carbonate rock reservoir, hole-Caves, Fracture-Pore-Caves, nonuniformity is very strong.Low by drilling and coring delivery yield rate, it is low that rock core goes out a ratio of briquetting, and in testing laboratory, mould processing success ratio is low, so the rock core model that can obtain from down-hole is often representative very poor, can not reflect the truth of oil reservoir inside.
The model that stitches at present hole type Carbonate Reservoir physical simulation for carrying out mostly is photoetching glass model and dull and stereotyped physical simulation, poor with the similarity of true reservoir rocks, and can not meet the needs of fracture and vug carbonate reservoir condition physical simulation.
Prior art discloses 2 pieces of patent documentations, first piece: " smelting method for preparing borate glass base hole reservoir model ", application number: CN200710052873.7, mainly provides smelting method for preparing borate glass base hole reservoir model.The natural galenite of this preparation method take the borate glass of high velocity of wave as matrix, low velocity of wave is hole simulation snotter, galenite is processed into micron-sized particle, first melting borate glass in high temperature Muffle furnace, then micron order galenite particle is mixed in borate glass matrix when the glass ware forming and is made.Borate glass base hole reservoir model prepared by the present invention, matrix ultrasonic velocity is high, and hole simulation snotter velocity of wave is low, matrix mates better with hole velocity of wave, moulded dimension is less, and realistic geological condition is conducive to improve the exploration such as reservoir, hydrocarbon-bearing pool success ratio.This patent is mainly used in the research of physical prospecting process.
Second piece: " for the visual physical simulation displacement areal model of the displacement of reservoir oil ", the patent No., 01261327.4, this patent is plane visualization physical model, mainly portraying with glass or etching forms, is low pressure model, is not used in physical simulation experiment under High Temperature High Pressure.
Draw by contrast: existing artificial seam hole type physical model majority is applied to and improves the exploration success ratio of reservoir, hydrocarbon-bearing pool or carry out the simulated experiment under low pressure condition, the surface nature in seam hole has bigger difference with true reservoir rocks, other model that is applied to fracture and vug carbonate reservoir exploitation and the evaluation of raising recovery ratio generally can only carry out qualitative experiment research under low pressure, can not carry out physical simulation experiment under reservoir temperature pressure condition.
Summary of the invention
In order to build the artificial physical model similar to truly stitching hole type physical models of reservoir, material therefor is selected, be identified for making the material composition of physical model.
The technical issues that need to address of the present invention are, according to fracture and vug carbonate reservoir rock composition and reservoir space design feature, to provide a kind of for making the material composition of seam hole type Carbonate Reservoir physical model.
For achieving the above object, on the basis of similarity theory research, by fracture, solution cavity and matrix pores space distribution rule and geometric shape research, the material that builds physical model is screened, select the physical model material that meets seam hole type Carbonate Reservoir feature.
The making material of one of the present invention's carbonate cave oil reservoir physical model is achieved in that
Described material comprises making material of main part and the physical model framework material of crack solution cavity in physical model;
In described physical model, the making material of main part of crack solution cavity is selected from Wood's metal and/or paraffin.
In concrete enforcement
(1) described Wood's metal is mainly used in making compared with cavern and crack, and its consumption calculates according to the following formula: M
a=V φ
v & f8.34, in formula:
M
a-Wood's metal consumption, g;
The cumulative volume of V-institute processing model, cm
3;
φ
v & fin-institute processing model, need with the crack of Wood's metal filling and the factor of porosity in hole, %;
The average density of 8.34-Wood's metal, g/cm
3;
(2) described paraffin is mainly used in making less solution cavity and crack, and its consumption calculates according to the following formula: M
w=V φ
w0.90, in formula:
M
w-Wood's metal consumption, g;
The cumulative volume of V-institute processing model, cm
3;
φ
win-institute processing model, need with the crack of paraffin filling and the factor of porosity in hole, %;
The average density of paraffin under 0.90-normal temperature, g/cm
3.
Described physical model framework material is made up of kalzit, pierite and the Irish touchstone rock fiber of different-grain diameter;
Described kalzit, dolomitic granularity are greater than 60 orders, and particle size distribution meets Normal Distribution Characteristics, and the weight ratio of its framework material in model is between 25%～85%;
The thickness of described basalt fibre is about 6～12 μ m, and length is about 1～5mm, and its weight ratio in framework material in model is not more than 1%;
The described material for making carbonate cave oil reservoir physical model can also comprise physical model jointing compound;
Described jointing compound can comprise white lime and No. 625 cement, and the ratio that wherein white lime accounts for model gross mass is no more than 15%, cement proportion 5%～15%; Described jointing compound can also comprise that ratio is 1%～5% minor glue agent water glass.
The described material for making carbonate cave oil reservoir physical model can also comprise other auxiliary material, and other described auxiliary material are the cement intensifier of implementation model intensity, and its ratio that accounts for model gross mass is no more than 0.5% of cement consumption.
The method for making of the present invention's two carbonate cave oil reservoir physical model is achieved in that
Described method comprises the steps:
1) first make the solution cavity of different size and form, the model in crack with Wood's metal and/or paraffin;
2), after model forming, at the temperature higher than 85 ℃, by Wood's metal and/or paraffin displacement out, form the crack solution cavity with space structure.
Described step 1) in, according to the spatial geometric shape of crack solution cavity and moulded dimension, utilize the model of Wood's metal and/or paraffin processing crack and solution cavity, the model processing is put into mould, the framework material that mixes of cast, concussion makes it after filling evenly, tightens mould and at CO
2in atmosphere, dewater aging 10 days;
Described step 2) in, the physical model of moulding, at the temperature higher than 85 ℃, is first carried out to displacement with gases at high pressure, collect Wood's metal and the paraffin of displacing, and use solvent cleaning model.
The effect of invention
Utilize this material composition can build the carbonate cave oil reservoir physical model of different size model, make its seepage flow characteristics, pore structure characteristic and poroperm characteristics similar to true reservoir cores, meet the needs of fracture and vug carbonate reservoir physical simulation.
Accompanying drawing explanation
Fig. 1 is the solution cavity of different size and distribution in model.
Fig. 2 utilizes the seam hole space distribution picture of CT scan in the artificial physical model that this material makes
Embodiment
The present invention mainly comprises the selection of framework material, mainly utilizes kalzit and pierite and a small amount of basalt fibre as the framework material that builds physical model.Utilize white lime and cement and water glass as jointing compound.Utilize Wood's metal and paraffin and heavy bitumen matter as the material of making crack solution cavity.Different proportionings can be made the seam hole form of different size and the physical model of intensity.
At high temperature can become liquid because Wood's metal and paraffin have, therefore the present invention selects the material of main part that Wood's metal material and paraffin are made as solution cavity crack.First make solution cavity, the crack of different size and form with Wood's metal and paraffin, wait after whole model forming, at high temperature by Wood's metal and paraffin displacement out, form the crack solution cavity with space structure.
The selection of physical model framework material: adopt kalzit, pierite and the Irish touchstone rock fiber of different-grain diameter as framework material.Wherein, kalzit and pierite are as the main support material of physical model, and basalt fibre plays the effect that increases mold strength.
Wherein kalzit, dolomitic granularity are greater than 60 orders, and particle size distribution meets Normal Distribution Characteristics.Mass ratio in model is between 25%～85%, and wherein the thickness of basalt fibre is about 6～12 μ m, and length is about 1～5mm, and consumption is not more than 1% of gross mass.
The selection of physical model jointing compound: adopt white lime, No. 625 cement as main jointing compound, the ratio that wherein white lime accounts for model gross mass is no more than 15%, cement proportion 5%～15%.Utilize water glass as minor glue agent, ratio is 1%～5%.
Other auxiliary material: in order to guarantee the similarity of physical model and true core, other auxiliary material also comprise heavy bitumen matter, strengthen reinforcing agent.Heavy bitumen matter and paraffin one are used from fracture faces, realize the simulation in its strong oil-wet surface nature and bituminous matter filling crack.
Claims (6)
1. a method for making for carbonate cave oil reservoir physical model, is characterized in that:
The making material of described model comprises making material of main part and the physical model framework material of crack solution cavity in physical model;
In described physical model, the making material of main part of crack solution cavity is selected from Wood's metal and/or paraffin;
Described method for making comprises the steps:
1) first make the solution cavity of different size and form, the model in crack with Wood's metal and/or paraffin;
2), after model forming, at the temperature higher than 85 ℃, by Wood's metal and/or paraffin displacement out, form the crack solution cavity with space structure;
In described step 1), according to the spatial geometric shape of crack solution cavity and moulded dimension, utilize the model of Wood's metal and/or paraffin processing crack and solution cavity, the model processing is put into mould, the framework material that mixes of cast, concussion makes it after filling evenly, tightens mould and at CO
2in atmosphere, dewater aging 10 days;
Described step 2) in, the physical model of moulding, at the temperature higher than 85 ℃, is first carried out to displacement with gases at high pressure, collect Wood's metal and the paraffin of displacing, and use solvent cleaning model.
2. the method for making of carbonate cave oil reservoir physical model as claimed in claim 1, is characterized in that:
(1) the described main consumption of Wood's metal calculates according to the following formula: M
a=V φ
v & f8.34, in formula:
M
a-Wood's metal consumption, g;
The cumulative volume of V-institute processing model, cm
3;
φ
v & fin-institute processing model, need with the crack of Wood's metal filling and the factor of porosity in hole, %;
The average density of 8.34-Wood's metal, g/cm
3;
(2) consumption of described paraffin calculates according to the following formula: M
w=V φ
w0.90, in formula:
M
w-paraffin consumption, g;
The cumulative volume of V-institute processing model, cm
3;
φ
win-institute processing model, need with the crack of paraffin filling and the factor of porosity in hole, %;
The average density of paraffin under 0.90-normal temperature, g/cm
3.
3. the method for making of carbonate cave oil reservoir physical model as claimed in claim 2, is characterized in that:
Described physical model framework material is made up of kalzit, pierite and the Irish touchstone rock fiber of different-grain diameter;
Described kalzit, dolomitic granularity are greater than 60 orders, and particle size distribution meets Normal Distribution Characteristics, and the weight ratio of its framework material in model is between 25%～85%;
The thickness of described Irish touchstone rock fiber is 6～12 μ m, and length is 1～5mm, and its weight ratio in framework material in model is not more than 1%.
4. the method for making of carbonate cave oil reservoir physical model as claimed in claim 3, is characterized in that:
The described material for making carbonate cave oil reservoir physical model also comprises physical model jointing compound;
Described jointing compound comprises white lime and No. 625 cement, and the ratio that wherein white lime accounts for model gross mass is no more than 15%, cement proportion 5%～15%; Described jointing compound also comprises that ratio is 1%～5% minor glue agent water glass.
5. the method for making of carbonate cave oil reservoir physical model as claimed in claim 3, is characterized in that:
Described also has other auxiliary material for making the material of carbonate cave oil reservoir physical model, and other described auxiliary material are heavy bituminous matter, and heavy bitumen matter and paraffin one are used from fracture faces, realize its strong oil-wet surface nature; Heavy bitumen matter consumption is no more than 5% of paraffin consumption.
6. the method for making of carbonate cave oil reservoir physical model as claimed in claim 3, is characterized in that:
The described material for making carbonate cave oil reservoir physical model also comprises physical model jointing compound;
Described jointing compound comprises white lime and No. 625 cement, and the ratio that wherein white lime accounts for model gross mass is no more than 15%, cement proportion 5%～15%; Described jointing compound also comprises that ratio is 1%～5% minor glue agent water glass;
The described material for making carbonate cave oil reservoir physical model also comprises other auxiliary material, and other described auxiliary material are the cement intensifier of implementation model intensity, and its ratio that accounts for model gross mass is no more than 0.5% of cement consumption.
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