CN102749275A

CN102749275A - Visualized artificial core model and preparation method thereof

Info

Publication number: CN102749275A
Application number: CN2012101806054A
Authority: CN
Inventors: 卢祥国; 金鑫
Original assignee: Northeast Petroleum University
Current assignee: Northeast Petroleum University
Priority date: 2012-06-04
Filing date: 2012-06-04
Publication date: 2012-10-24
Anticipated expiration: 2032-06-04
Also published as: CN102749275B

Abstract

A visualized artificial core model and a preparation method thereof. The model core is composed of two parts: a permeable layer and a matrix. The core is prepared through compression of quartz sand and an epoxy resin cement. The manufacturing process of the model comprises steps of: 1. evenly mixing the quartz sand and the cement, pressing and drying the mixture in a mold, and then cutting the mixture into a rectangular; 2. Polishing a surface of the permeable layer of the core to maintain the thickness at 3mm; 3. preparing a cement epoxy resin, and evenly coating the cement on a surface of a transparent sheet glass, after thickening but before curing of the cement; placing the sheet glass, with the coated surface downward, in the middle of the permeable layer of the core, and waiting for curing of the cement; 4. mounting gate seats on the surface of the permeable layer of the core; 5. preparing the epoxy resin cement and evnely coating the cement on the remaining portion of the core, after thickening but before curing of the cement; and 6. carrying out seal treatment and waiting for curing of the cement. Th permeable layer of the core has a permeability of 1000mD-50000mD, and the matrix has a permeability lower than 1mD.

Description

A kind of visual synthetic core model and preparation method thereof

Technical field

The present invention relates to a kind of visual rock core model that is used for oilfield chemistry oil displacement agent seepage flow mechanism and the research of profile control agent steering mechanism, belong to a kind of visual synthetic core model and preparation method thereof.

Background technology

In oilfield development process; Chemical oil displacement agent and profile control agent have a very important role at aspects such as improving water drive development effectiveness and raising oil recovery factor; Oil displacement agent and the profile control agent product that possesses certain function often has many, and this just need carry out preferably product.Product preferably according to being its seepage characteristic in reservoir cores, promptly need be carried out rock core displacement test.At present, owing to receive the restriction of natural core source and specification, the natural core cost of coring is very high in addition, and domestic research institution adopts synthetic core to substitute natural core more.In addition, improving the chemical flooding oil increasing effect is to grasp oil displacement agent seepage flow and profile control agent steering mechanism with the important technology approach that improves the chemical agent properties of product, and the exploration of these mechanism and research all be unable to do without visual displacement test.This shows that artificial Visualization Model performance characteristic is directly connected to the objective reality property of microscopic mechanism.

At present, the laboratory uses artificial Visualization Model to comprise glass back-up sand and glass etching model.Glass back-up sand Visualization Model is made up of two sheet glass and middle filling sand grains thereof.Do not contain in cementing matter and the manufacturing process in this model filling sand grains and do not apply stowing pressure, thereby have between sand grains between pore-size big and sand grains and glass sheet problem such as channelling.The glass etching Visualization Model is formed by two sheet glass sintering, and wherein a slice glass surface has formed the simulation rock duct through etching.This model pore texture is more single, and pore surface is smooth, and etching and sintering process more complicated, success ratio are low, and cost of manufacture is higher.In sum, existing artificial Visualization Model exist the emulation degree low with problem such as cost of manufacture height.

Summary of the invention

For solve existing artificial Visualization Model emulation degree low with problem such as cost of manufacture height, the invention provides a kind of visual artificial model and preparation method thereof.This artificial Visualization Model emulation degree is high and cost of manufacture is low.

The technical scheme that the present invention adopted is: this visual synthetic core model is made up of pervious course and matrix two parts, and the pervious course upper surface middle part is pasted with transparent glass sheet, and form is installed on the transparent glass sheet, is separately installed with valve seat on the form both sides are axial.

Visual artificial model preparation process:

(1) according to designing requirement weighing silica sand and cementing matter, mix, put into steel die pressurization, oven dry respectively, cut growth is square then, and the rock core apparent size is: height * wide * length=3cm * 6cm * 12cm;

(2) polished in the surface of rock core pervious course, make its thickness remain on 3mm;

(3) after the cementing matter multiviscosisty, evenly be applied to the transparent glass sheet surface of apparent size before the curing for height * wide * length=0.4cm * 4cm * 6cm; The glass sheet coated face is placed on rock core pervious course middle part downwards, waits for that cementing matter solidifies the back form is installed on transparent glass sheet;

(4) on rock core pervious course surface, along its length, gate seat is installed respectively apart from the position of end face 2cm, the gate seat material is a bakelite plate;

(5) evenly be applied to the remainder surface of rock core before after the cementing matter multiviscosisty, solidifying;

(6) rock core is placed in the mould, pours epoxy resin into and carry out encapsulation process, wait for and solidifying.

The beneficial effect that the present invention had: the present invention has overcome the high problem of the visual rock core model emulation of glass back-up sand degree; Also overcome simultaneously the high problem of glass etching modelling cost; Rock core pervious course permeability 1000mD～50000mD of the present invention, rock core matrix permeability rate is lower than 1mD.Rock core prescription composition, cementing matter and pressing process are used existing technology.Rock core prescription composition, cementing matter and pressing process also can be seen Chinese invention patent " process for making quartz sand epoxy resin cementitious non-homogeneous model " (ZL200510063665.8).

Description of drawings:

Fig. 1 is visual synthetic core model vertical view;

Fig. 2 is visual synthetic core model structure synoptic diagram;

Fig. 3 is a rock core compacting tool set synoptic diagram;

Fig. 4 is visual synthetic core model front view;

Fig. 5 is microcosmic displacement test equipment and process flow diagram;

Fig. 6 carries out the SMG transfer drive after the microvisual model water drive, remaining oil distribution figure when each displacement stage finishes.

Embodiment:

This visual synthetic core model is made up of pervious course and matrix two parts, and wherein the pervious course function is a liquid seepage flow and settle form, and body portion is that pervious course provides and adheres to and prop carrier.Visual artificial model preparation process:

(1) silica sand and cementing matter mix, and put into steel die pressurization, oven dry respectively, and cut growth is square then, and the rock core apparent size is: height * wide * length=3cm * 6cm * 12cm; ((permeability Kg≤0.1mD) form for permeability Kg=1000mD～50000mD) and matrix by two parts by pervious course for this rock core; All the potpourri by silica sand and epoxy gluing thing forms through compacting; Thick (40 orders～100 orders), cementing matter content lower (5%～8%) of the used quartz sand particle of pervious course wherein, the used quartz sand particle of matrix thin (270 orders～350 orders), cementing matter content higher (14%～18%).Compare with pervious course, matrix possesses perviousness hardly, only works the pervious course effect of supporting.

(2) with emery cloth polished in the surface of rock core pervious course, make its thickness remain on 3mm;

(3) after the cementing matter multiviscosisty, evenly being applied to apparent size before the curing is: the transparent glass sheet surface of height * wide * length=0.4cm * 4cm * 6cm; The glass sheet coated face is placed on rock core pervious course middle part downwards; Wait for after cementing matter solidifies bakelite plate with holes is bonded at glass sheet surface with cementing matter, form form;

(4) on rock core pervious course surface, along its length, gate seat is installed apart from the centre position of end face 2cm, gate seat is processed by bakelite plate, center boring, hitch are so that install the stainless steel gate;

(6) rock core is placed in the mould, pours cementing matter epoxy resin into and carry out encapsulation process, obtain visual synthetic core model after the curing.The rock core outward appearance is seen Fig. 3, and Fig. 1 is a rock core outward appearance vertical view.The rock core compacting tool set is formed (Fig. 2) by side plate, end plate, base plate and pressing plate, and base plate bakelite plate, pressing plate are high-density plate, and all the other are carbon steel.The biside plate end face respectively has one group of eyelet, and available bolt links together two side plates.

The rock core that utilizes said method to make carries out the microcosmic displacement test, and microcosmic displacement test equipment and flow process are seen Fig. 4.On microvisual model, carry out the SMG transfer drive after the water drive, remaining oil distribution was seen Fig. 5 when each displacement stage finished, remaining oil distribution when wherein the left side circle is the water drive end, the right side circle is a remaining oil distribution after the profile control agent SMG transfer drive.

Claims

1. visual synthetic core model, this model rock core is made up of pervious course and matrix two parts, and the pervious course upper surface middle part is pasted with transparent glass sheet, and form is installed on the transparent glass sheet, and the form both sides are separately installed with valve seat on axially.

2. the described visual synthetic core Preparation of model method of claim 1 comprises the following steps:

(1) at first polished in the surface of rock core pervious course, make its thickness remain on 3mm; The rock core apparent size is: height * wide * length=3cm * 6cm * 12cm;

(2) solidify preceding cementing matter after the multiviscosisty and evenly be applied to the transparent glass sheet surface, the glass sheet coated face is placed on rock core pervious course middle part downwards, wait for that cementing matter solidifies the back form is installed on transparent glass sheet; The transparent glass sheet apparent size is: height * wide * length=0.4cm * 4cm * 6cm;

(3) on rock core pervious course surface, along its length, gate seat is installed respectively apart from the position of end face 2cm;

(4) cementing matter before solidifying after the multiviscosisty evenly is applied to the remainder surface of rock core;

(5) rock core is placed in the mould, pours cementing matter epoxy resin into and carry out encapsulation process, wait for and solidifying.