CN112780241B - Method for partitioning quantitative saturated bound water of planar heterogeneous large flat plate model - Google Patents
Method for partitioning quantitative saturated bound water of planar heterogeneous large flat plate model Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 229920006395 saturated elastomer Polymers 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000000638 solvent extraction Methods 0.000 title claims abstract description 7
- 230000035699 permeability Effects 0.000 claims abstract description 28
- 239000002023 wood Substances 0.000 claims abstract description 22
- 239000002985 plastic film Substances 0.000 claims abstract description 17
- 229920006255 plastic film Polymers 0.000 claims abstract description 17
- 238000005303 weighing Methods 0.000 claims abstract description 15
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 230000005465 channeling Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000009738 saturating Methods 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000001035 drying Methods 0.000 abstract description 2
- 238000011161 development Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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Abstract
The invention relates to a method for partitioning and quantifying saturated bound water by a planar heterogeneous large flat plate model, which comprises the following steps: (1) manufacturing a planar heterogeneous large flat plate model, drying, and calculating the bound water volume of the large flat plate model; (2) manufacturing small flat plate models with different permeability, saturating the sponge with binding water with 1.2 times of volume, sealing and weighing the small flat plate models by using plastic films, pressing the sponge on the small flat plate models by using wood plates, adding weights on the wood plates, and testing the sponge drainage under different pressures to obtain the relation between the overlying pressure and the saturation degree of the binding water; (3) horizontally placing the large flat plate model, respectively placing a layer of sponge on areas with different permeability, sequentially placing a wood plate and a weight with a certain weight on the sponge, and draining water under the pressure of the sponge so as to saturate and bind water in different areas; (4) the sponge was weighed every interval of time to determine the bound water saturation level. The method establishes initial conditions of the large flat plate model which are more consistent with the actual reservoir characteristics, and has important value for subsequent physical simulation experiments.
Description
Technical Field
The invention relates to a method for partitioning and quantifying saturated bound water by a planar heterogeneous large flat plate model, belonging to the technical field of petroleum development.
Background
The large-scale flat plate sand filling model is an important carrier for physical experiments in an oil and gas field development room, and researchers often make a heterogeneous flat plate model to simulate the influence of actual reservoir heterogeneity on the development effect.
The large flat plate model needs saturated bound water in the experimental preparation stage, and the existing large flat plate model bound water saturation methods mainly comprise two methods. One is to evacuate a quantitative water injection, which injects a corresponding volume of water quantitatively according to the irreducible water saturation and saturated water volume of the rock plate, but this way can result in uneven distribution of injected water, with water saturation higher than irreducible water saturation near the injection end and lower than irreducible water saturation at the remote end. The other method is that water cannot be discharged after gas drive or oil drive after saturated water, for example, a bound water saturation method involved in a sand filling method (CN106223928B) of a multilateral well experimental model, and field data and core data show that the bound water saturation of areas with different physical properties is different, and the saturation method cannot quantitatively saturate bound water for areas with different permeabilities in a large plate model. And some sand filling models are directly filled in a large flat kettle body at present and cannot be directly weighed to determine the saturated water quantity. Therefore, a method for establishing a large flat sand-packed model to quantify saturated water is very necessary.
Disclosure of Invention
The invention aims to provide a method for quantitative saturation bound water in a planar heterogeneous large flat plate model in a subarea manner, which has reliable principle and simple and convenient operation, establishes an initial condition of the large flat plate model which is more in line with the actual reservoir characteristics, overcomes the defects of uneven distribution of injected water, incapability of quantitative saturation bound water and inconvenience in weighing of the large flat plate existing in the prior flat plate model saturated bound water, and has important value for subsequent physical simulation experiments.
In order to achieve the technical purpose, the invention adopts the following technical scheme.
A method for partitioning quantitative saturated bound water of a planar heterogeneous large flat plate model sequentially comprises the following steps:
(1) manufacturing a planar heterogeneous large flat plate model, drying, and calculating the bound water volume of the large flat plate model;
(2) manufacturing small flat plate models with different permeability according to a large flat plate model formula, saturating sponge with binding water with 1.2 times of volume, sealing and weighing the small flat plate models by using plastic films, pressing the sponge on the small flat plate models by using wood plates, adding weights on the wood plates, and testing the sponge drainage under different pressures to obtain the relation between the overlying pressure and the saturation degree of the binding water;
(3) horizontally placing the large flat plate model, respectively placing a layer of sponge on areas with different permeability, sequentially placing a wood plate and a weight with a certain weight on the sponge according to the relation between the upper covering pressure intensity and the saturation degree of the bound water in the step (2), and draining water under the pressure of the sponge so as to saturate the bound water in a subarea manner;
(4) and weighing the sponge every other time period, and determining the saturation degree of the bound water until different areas of the large flat plate model are saturated with the required quantitative bound water.
In the step (1), a planar heterogeneous large flat plate model is manufactured, the permeability of different areas of the model plane is different, and the bound water volume of the different permeability areas of the model is obtained through calculation.
In the step (2), small flat plate models with different permeability are manufactured according to the formula of the large flat plate model, the sponge with the same shape as the small flat plate model is obtained by cutting, the sponge is sealed by a plastic film after saturated water to prevent water from losing, and the weight V of the sponge after saturated water is weighed0Cutting off the plastic film on the contact surface of the sponge and the small flat plate, placing the cut plastic film on the small flat plate, pressing a wood plate with the same shape, adding weights on the wood plate, and weighing the sponge weight V after a certain time1Obtaining the sponge water discharge (V) under different overlying pressures0—V1) The sponge displacement, which is the saturated water volume of the flat model, is determined as the sponge overlying pressure (P) based on bound water saturation (displacement/bound water volume) and displacement/water density (displacement/water density)1、P2…Pn) In relation to the degree of bound water saturation, the overburden pressure is (weight of wood board + weight of weight)/area of wood board.
In the step (3), the shape and the area of the sponge are the same as those of different permeability areas of the large flat plate model, the sponge is sealed by a plastic film after being saturated with 1.2 times of volume of bound water to prevent water loss, the weight of the sponge after saturated water is weighed, the sponge is placed on the large flat plate model, the plastic films on the contact surfaces of the sponge and the large flat plate model are cut according to the corresponding arrangement of the positions of the large flat plate model with different permeability distributions, the different sponges are separated by the plastic film to avoid mutual channeling, wood boards with the same shape are respectively placed on the sponge, weights with a certain weight are placed above the different wood boards according to the relation between the overlying pressure and the saturation degree of the bound water measured in the step (2), the sponge is pressed to drain water, and the different permeability areas of the flat plates realize regional saturation of the bound water.
In the step (4), weighing the sponge at intervals of a time period to determine the water discharge, and if the saturation degree of bound water is less than 100%, continuing to saturate; when the saturation degree of the bound water is close to 100%, the length of a measuring and weighing time period is shortened, and excessive saturation is avoided until different areas of the large flat plate model are saturated with the bound water.
The method utilizes the planar heterogeneous flat model and a plurality of sponges of saturated water to realize quantitative saturated formation water of different permeability areas of the large flat model under indoor conditions, overcomes the problems of nonuniform saturation of bound water, incapability of quantitative saturation and inconvenience in weighing the flat model in the prior art, establishes initial conditions of the large flat model which are more in line with actual reservoir characteristics, and has important value for developing subsequent indoor physical simulation experiments.
Drawings
FIG. 1 is a graph showing the permeability distribution of the large plate model in the example.
FIG. 2 is a graph of bound water saturation of a 50mD plate model at various pressures versus time.
FIG. 3 is a graph of bound water saturation of a 400mD plate model versus time at various pressures.
FIG. 4 is a graph of bound water saturation of a 800mD plate model versus time at various pressures.
Detailed Description
The present invention is further described below with reference to the accompanying drawings so as to facilitate understanding of the present invention by those skilled in the art. It is to be understood that the invention is not limited in scope to the specific embodiments, but is intended to cover various modifications within the spirit and scope of the invention as defined and defined by the appended claims, as would be apparent to one of ordinary skill in the art.
A method for partitioning quantitative saturated bound water of a planar heterogeneous large flat plate model sequentially comprises the following steps:
(1) the large flat plate model with heterogeneous plane is obtained by making, the plane is divided into three regions with different permeability (figure 1) of 50mD, 400mD and 800mD, the bound water volume of the three regions is 92.90cm3、222.12cm3And 64.78cm3。
(2) According to the formula of the large flat plate model, small flat plate models with the permeability of 50mD, 400mD and 800mD are respectively manufactured, the size of each small flat plate model is 4cm multiplied by 3cm, and the parameters are shown in the table 1. Manufacturing sponges with the same shape as the small flat plate, saturating the sponges with binding water with the volume 1.2 times, pressing the sponges on the small flat plate model by using a wood plate after sealing and weighing, adding weights on the wood plate, testing the drainage quantity of the sponges under different pressures, and obtaining the relation between different overlying pressures and the binding water saturation degrees, wherein fig. 2-4 are curves of the binding water saturation degrees of the flat plate models of 50mD, 400mD and 800mD along with time respectively under different pressures.
TABLE 1 Small flat model irreducible Water saturation and irreducible Water volume
(3) And 3 sponges are manufactured, the shapes and the areas of the sponges are respectively the same as 50mD, 400mD and 800mD permeability areas of the large flat plate models, the sponges are sealed by plastic films after being saturated by 1.2 times of water, water loss is prevented, and the weight of the sponges after being saturated with water is weighed. Placing the sponge on the large flat plate model, correspondingly arranging the sponge according to the positions of the large flat plate model with different permeability distributions, and cutting off the plastic film on the contact surface of the sponge and the large flat plate model. Different sponges are separated by plastic films, so that mutual flow-through is avoided.
The wood boards with the same shape as the sponge are respectively placed on the sponge, according to the time-varying curves of the bound water saturation degree of the flat plate models with different permeabilities in the graphs of figures 2-4, the saturated bound water efficiency is low when the overlying pressure is low, and water in the sponge possibly flows out of the film when the pressure is high, so that the overlying pressure of 60Pa is selected for bound water saturation.
(4) Weighing the sponge every other time period, determining the water discharge and the saturation degree of bound water, and continuing to saturate if the saturation degree is less than 100%; when the saturation degree of the bound water is continuously increased, the time period length of metering and weighing is shortened, and over-saturation is avoided. Until different areas of the large plate model are saturated with bound water.
The saturation process of the large rock plate model in different permeability areas is shown in table 2, the 800mD area is saturated and the sponge in the corresponding position is removed at 3.8h, the 400mD area is saturated and the sponge in the corresponding position is removed at 4h, the 50mD area is saturated and the water is quantitatively bound in the large plate model in different permeability areas after 4.5 h.
Table 2 regional bound water saturation levels of different permeabilities
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. A method for partitioning quantitative saturated bound water of a planar heterogeneous large flat plate model sequentially comprises the following steps:
(1) making a planar heterogeneous large flat plate model, wherein the permeability of different regions of the model plane is different, and calculating to obtain the bound water volume of the different permeability regions of the model;
(2) making small flat plate models with different permeability according to the formula of the large flat plate model, cutting to obtain sponges with the same shape as the small flat plate models, sealing the sponges with a plastic film after saturated water to prevent water loss, and weighing the sponges with the weight V after saturated water0Cutting off the plastic film on the contact surface of the sponge and the small flat plate, placing the cut plastic film on the small flat plate, pressing a wood plate with the same shape, adding weights on the wood plate, and weighing the sponge weight V after a certain time1Obtaining the sponge water discharge (V) under different overlying pressures0—V1) The sponge water displacement is the saturated water quantity of the flat plate model, and the relation between the overlying pressure of the sponge and the saturation degree of the bound water and the overlying pressure are obtained according to the saturation degree of the bound water = water displacement volume/bound water volume and water displacement volume = water displacement/water density= (wood board weight + weight of weight)/wood board area;
(3) horizontally placing the large flat plate model, respectively placing a layer of sponge on areas with different permeability, sequentially placing a wood plate and a weight with a certain weight on the sponge according to the relation between the upper covering pressure intensity and the saturation degree of the bound water in the step (2), and draining water under the pressure of the sponge so as to saturate the bound water in a subarea manner;
(4) weighing the sponge at intervals of a time period to determine the water discharge, and if the saturation degree of bound water is less than 100%, continuing to saturate; when the saturation degree of the bound water is close to 100%, the length of a measuring and weighing time period is shortened, and excessive saturation is avoided until different areas of the large flat plate model are saturated with the bound water.
2. The method according to claim 1, wherein in step (3), the shape and area of the sponge are the same as those of the different permeability regions of the large flat model, the sponge is sealed with plastic film after being saturated with 1.2 times of the volume of the bound water to prevent water loss, the weight of the sponge after saturated water is obtained, the sponge is placed on the large flat model, the plastic film on the contact surface of the sponge and the large flat model is cut off according to the corresponding arrangement of the different permeability distribution positions of the large flat model, the different sponges are separated by the plastic film to avoid mutual channeling, wood boards with the same shape are respectively placed on the sponges, weights with a certain weight are placed on the different wood boards according to the relation between the overlying pressure and the saturation degree of the bound water measured in step (2), and the sponge is pressed to drain water, the different permeability areas of the flat plate realize the zonal saturation and water binding.
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| CN111208042A (en) * | 2020-02-07 | 2020-05-29 | 中国科学院武汉岩土力学研究所 | Device and method for inverting hydraulic parameters of unsaturated waste soil |
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| CN102704911B (en) * | 2012-06-01 | 2016-08-03 | 中国石油大学(北京) | A kind of multilateral well experimental model, system and back-up sand method |
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| CN111208042A (en) * | 2020-02-07 | 2020-05-29 | 中国科学院武汉岩土力学研究所 | Device and method for inverting hydraulic parameters of unsaturated waste soil |
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