CN106223928B - Sand filling method of multilateral well experimental model - Google Patents

Sand filling method of multilateral well experimental model Download PDF

Info

Publication number
CN106223928B
CN106223928B CN201610693430.5A CN201610693430A CN106223928B CN 106223928 B CN106223928 B CN 106223928B CN 201610693430 A CN201610693430 A CN 201610693430A CN 106223928 B CN106223928 B CN 106223928B
Authority
CN
China
Prior art keywords
experimental model
model
water
sand
experimental
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201610693430.5A
Other languages
Chinese (zh)
Other versions
CN106223928A (en
Inventor
韩国庆
吴晓东
朱明�
安永生
高慎帅
张睿
曹光朋
范卫潮
高飞
徐立坤
张田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China University of Petroleum Beijing CUPB
Original Assignee
China University of Petroleum Beijing CUPB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China University of Petroleum Beijing CUPB filed Critical China University of Petroleum Beijing CUPB
Priority to CN201210180178.XA priority Critical patent/CN102704911B/en
Priority to CN201610693430.5A priority patent/CN106223928B/en
Publication of CN106223928A publication Critical patent/CN106223928A/en
Application granted granted Critical
Publication of CN106223928B publication Critical patent/CN106223928B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/20Displacing by water
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/06Measuring temperature or pressure
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells

Abstract

The invention relates to a sand filling method of a multilateral well experimental model, which comprises the following steps: uniformly mixing fine sand and clay according to the ratio of 4: 1; filling the mixed fine sand and clay mixture into an experimental model by adopting a dry filling method and compacting; injecting water into the experimental model until the experimental model is saturated; the experimental model was flooded with water to oil saturation using white oil. According to the method provided by the embodiment of the invention, the sand filling model with lower permeability can be obtained by utilizing the water swelling performance of the clay, and the bound water can be formed by a saturated oil method, so that the oil reservoir is more similar to a real oil reservoir.

Description

Sand filling method of multilateral well experimental model
The application is a divisional application of Chinese patent applications with the application date of 2012, 06, 01 and the application number of 201210180178.X, and the name of the invention is 'a multilateral well experiment model, system and sand filling method'.
Technical Field
The invention relates to the technical field of multilateral well physical simulation, in particular to a sand filling method of a multilateral well experimental model.
Background
Multilateral wells refer to wells having a well bore that is drilled along a horizontal direction at an angle of up to or near 90 degrees. Multilateral well bores extend horizontally for considerable lengths in the reservoir and sometimes for certain special requirements the well angle can exceed 90. Multilateral wells are generally suitable for use in thin or fractured hydrocarbon reservoirs with the objective of increasing the exposed area of the hydrocarbon reservoir.
The physical simulation technology of the multilateral well is a physical simulation experiment technology for simulating the real condition of the multilateral well oil deposit by utilizing an experiment device in a laboratory, and can observe the physical phenomenon in the mining process of the multilateral well oil deposit in the laboratory, test static and dynamic parameters of the oil deposit, analyze the seepage characteristics and the oil displacement mechanism of the multilateral well, and compare and optimize the injection and production process.
In the multilateral well physical simulation technology, a multilateral well physical model is the basis of a multilateral well physical simulation experiment. Multilateral well physical models can be divided into two broad categories, namely, basic mechanism study models and proportional models, according to different study objectives. The former can be manufactured not in proportion, can simulate a unit or a process, researches the mechanism of physical phenomena and gives qualitative knowledge; the model is designed according to a similar principle, geometric similarity, motion similarity and dynamic similarity between the model and the prototype are satisfied in principle, and experimental operation, data processing and application of experimental results are completed under the guidance of the similar principle. At present, the physical simulation models and experiments of multilateral wells at home and abroad can be mainly divided into the following four types: static electric simulation model and experiment, dynamic one-dimensional physical simulation model and experiment, dynamic two-dimensional physical simulation model and experiment, and dynamic three-dimensional physical simulation model and experiment.
Compared with electric simulation, one-dimensional physical simulation and two-dimensional physical simulation, the multilateral well dynamic three-dimensional physical simulation has the obvious advantages that the dynamic change of a real oil reservoir can be reflected more truly, the complex geological characteristics, the complex well completion process and the multilateral well production dynamic in a complex exploitation mode can be simulated, and the method is an important means for researching the exploitation mechanism of the multilateral well. Compared with one-dimensional and two-dimensional dynamic physical models, only the three-dimensional proportional model can comprehensively and quantitatively analyze a plurality of parameters of the control physical process, so that more accurate prediction is provided for the development dynamics of the underground oil deposit, and the two models focus more on qualitative research.
In the prior art, the three-dimensional physical simulation test device for the multilateral well has three linear degrees, and simulates the actual multilateral well oil deposit from the perspective of space. The researchers at home and abroad have made many researches on the dynamic three-dimensional physical simulation of multilateral wells. At present, three-dimensional models are mainly divided into proportional models and non-proportional models, the proportional models and the non-proportional models are more researched and applied, and the three-dimensional models are developed more maturely.
The dynamic three-dimensional proportional model is usually designed in proportion by the guidance of a similar theory aiming at the specific oil extraction process of a specific oil reservoir on site. The proportional design means that a prototype oil field is made into a solid model in a laboratory scale according to a set of similar criteria and a proportional reduction size. Generally, the geological conditions of oil reservoirs are different, the emphasis points of simulation research are different, and the similarity criteria for establishing the model are also different.
However, compared with the first three simulation devices, the multilateral well three-dimensional physical simulation device has the following disadvantages: the volume is huge, the structure is complicated, the cost is high, the experimental process is complicated and tedious and must be debugged in advance, and various temperature, pressure and flow sensors which are equipped are not only large in quantity but also high in requirement.
FIG. 1 is a schematic diagram of a prior art experimental apparatus, as shown in FIG. 1, which uses hydraulic pressurization to simulate overburden pressure in a formation; the upper part simulates an oil reservoir, the lower part simulates bottom water, the two parts are separated by a bottom water diffusion net, and an equipotential surface in an infinite diversion state is simulated; the circulating system adopts the stainless steel capillary with the outer diameter of 3mm and the inner diameter of 1.5mm, and when small flow rate is provided for the model, fluid can consume large flow resistance through the capillary, so that the model can be stably supplied with small pressure. The principle of ray method for measuring the rising height of bottom water is that the water level rises at the rising position of the ray. Because the model has different degrees of ray attenuation when the oil-water saturation is different, the change of the oil-water saturation can be measured according to the change of the ray intensity on a plane, and the rising height of the bottom water can be calculated through a formula.
In the experimental setup shown in fig. 1, the oil layer in the model is macroscopically homogeneous; the initial aqueous and oil layers are clearly distinguished; the water in the development process comes from bottom water completely, and no side water exists. However, the technology adopts the radioactive source to judge the change of oil-water saturation and the rising height of bottom water, so the following problems exist: a real reservoir cannot be fully simulated. The pressure of the injection port is measured only by a pressure gauge, the pressure field distribution of the multilateral well near the well cannot be monitored, and then the inflow profiles of different horizontal sections cannot be judged, so that the real oil reservoir cannot be completely simulated; potential safety hazards exist. The radioactive source is adopted to judge the saturation change of oil water and the rising height of bottom water, which needs very sound protective measures and operation specifications, and once the operation is not proper, very serious results can be caused; data collection is not scientific. The data acquisition mode is manual acquisition, when the multilateral well starts to meet water, the flow data needs to be read once at short intervals, and the workload is large; the multilateral well type is single. Only the unbranched multilateral well is simulated to develop the bottom water reservoir, the multilateral well is not involved, and the well type is single.
Fig. 2 and fig. 3 are a schematic physical model diagram and a test flow chart of an experimental apparatus in the prior art, respectively, and as shown in fig. 2 and fig. 3, the physical model size of the confined boundary low permeability reservoir multilateral well constant pressure production test flow is 30cm × 25cm × 5 cm. Firstly, the manufactured physical model is tested for leakage, the vacuum pumping is carried out and the formation water is saturated under the condition that no leakage exists, the high-precision metering pump is used for injecting the formation water to displace the physical model, the formation water in the model is compressed to add certain pressure, and the test is pressurized to 0.235 MPa. And correcting the pressure sensor, the patrol instrument and the electronic balance, and connecting the patrol instrument and the electronic balance to a computer by using signal lines so as to automatically collect test data.
The simulation technology shown in fig. 2 and 3 adopts low-permeability natural sandstone outcrop and is encapsulated by resin, and although the requirement of low permeability is met, the technology has the following defects due to the particularity of a physical model and the dispersibility of measuring points: the reservoir cannot be accurately reflected. Compared with the first technology, the technology has great progress in monitoring the pressure distribution of the oil reservoir, the distribution of the pressure field is monitored by adopting 15 measuring points, but the final pressure distribution profile is not accurate enough because the measuring points are too dispersed; the situation when bottom water and side water exist cannot be simulated. Because the low-permeability natural sandstone outcrop is adopted and is encapsulated by resin, only a closed boundary can be simulated, and side and bottom water cannot be simulated; the multilateral well type is single.
In general, in the prior art, the dynamic three-dimensional scale model has the following problems:
the sand filling experiment in the prior art can only carry out physical simulation on the productivity of a multilateral well and the change rule of output liquid along with time, cannot measure the pressure field distribution of a near well in a model, and cannot truly reflect the pressure change rule of an oil reservoir in the whole exploitation process;
in the multilateral well sand filling experiment in the prior art, the boundary which can be simulated only has a bottom water boundary, and the boundary of side water cannot be simulated;
in the multilateral well sand filling experiment in the prior art, the productivity of the multilateral well without branches can only be simulated, but the productivity of the multilateral well cannot be simulated;
in the multilateral well sand filling experiment in the prior art, data collection is mostly manual collection and then manual or computer processing is carried out, so that low efficiency and increased errors are often caused;
in the prior art, a water channeling phenomenon occurs in the displacement process of a multilateral well sand filling experiment, so that the water content is increased rapidly;
in the prior art, a manual method is difficult to manufacture a low-permeability sand-filling model.
Disclosure of Invention
In order to overcome the problem that a manual method in the prior art is difficult to manufacture a low-permeability sand-packed model, the invention provides a sand-packed method of a multilateral well experimental model, which is realized by the following steps:
a sand filling method of a multilateral well experimental model comprises the following steps:
uniformly mixing fine sand and clay according to the ratio of 4: 1;
filling the mixed fine sand and clay mixture into an experimental model by adopting a dry filling method and compacting;
injecting water into the experimental model until the experimental model is saturated;
the experimental model was flooded with water to oil saturation using white oil.
Optionally, in one embodiment of the invention, the white oil has a viscosity of 115 mPa-s at 25 ℃.
Optionally, in an embodiment of the present invention, the fine sand is 200 mesh fine sand.
Optionally, in an embodiment of the present invention, the filling the mixed fine sand and clay mixture into the experimental model and compacting by using a dry filling method includes:
and dry-filling the mixed fine sand and clay mixture into an experimental model in a manner of filling sand layer by layer and compacting layer by layer.
The sand filling method of the multilateral well experimental model provided by the invention can obtain the sand filling model with lower permeability by utilizing the water swelling performance of the clay, and when the ratio of the fine sand to the clay is 4: at 1, the laboratory had the lowest permeability. The white oil is used for driving the experimental model to be saturated, bound water can be formed in the experimental model, and the oil reservoir is closer to a real oil reservoir. Therefore, the sand filling model with low permeability is obtained by adopting the sand filling and oil saturation generation method mixed in a special proportion, so that the experimental model is closer to the real condition of the oil reservoir, and a foundation is laid for the success of the experiment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of an experimental apparatus in the prior art.
FIG. 2 is a diagram of a physical model in the prior art.
FIG. 3 is a schematic diagram of a prior art experimental procedure.
Fig. 4 is a structural diagram of an experimental model of a multilateral well according to an embodiment of the present invention.
Fig. 5 is a structural diagram of an experimental model of a multilateral well according to an embodiment of the present invention.
FIG. 6 is a schematic representation of a multilateral well model pattern according to an embodiment of the invention.
FIG. 7 is a cross-sectional view of an experimental model provided by an embodiment of the present invention.
Fig. 8 is a structural diagram of a multilateral well experiment system according to an embodiment of the present invention.
Fig. 9 is a structural diagram of a pressure sensing device according to an embodiment of the present invention.
Fig. 10 is a flow chart of a multilateral well experiment model sand-filling method according to an embodiment of the present invention.
Fig. 11 is a flow chart of a multilateral well experimental model channeling prevention method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
The embodiment of the invention provides a multilateral well experimental model, a multilateral well experimental system and a sand filling method, and the invention is described in detail below by combining the attached drawings.
Example one
Fig. 4 is a structural diagram of a multilateral well experimental model according to an embodiment of the present invention, and as shown in fig. 4, an upper portion 401 of the multilateral well experimental model 400 is filled with experimental sand, a lower portion 402 of the experimental model is filled with bottom water, a bottom water diffusion plate 403 is disposed between the upper portion and the lower portion, and a layer of gauze (not shown) is disposed between the bottom water diffusion plate and the upper portion.
In the embodiment of the present invention, the multilateral well experiment model 400 may be a square container, and the inside of the container can bear a high pressure of 12 MPa. The multilateral well experimental model is divided into an upper part and a lower part, wherein the upper part 401 is filled with sand to simulate an oil reservoir, the lower part 402 is used for simulating bottom water, the two parts are separated by a bottom water diffusion plate 403, a layer of gauze is laid on the bottom water diffusion plate 403 to prevent sand on the upper part from falling to the lower part, and an equipotential surface and an infinite diversion state are simulated.
In the present example, the experimental sand filled in the upper part 401 is prepared by mixing fine sand (200 mesh) and clay to simulate the stratum, and the mixture of the fine sand and the clay in different proportions can obtain different permeabilities. In the technology, a large number of experiments verify that the optimal mixing ratio of the fine sand and the clay is 4:1, and the permeability of the experimental sand is 33 multiplied by 10-3μm2
In the experimental process, firstly, fine sand and clay are uniformly mixed according to the optimal proportion, then sand filling is carried out by adopting a dry filling method, saturated water is carried out after the sand filling is finished, and then water is displaced by white oil with specific viscosity (the viscosity of the white oil is 115mp & s at 25 ℃) until the oil is saturated. According to the method, a sand filling model with lower permeability can be obtained by utilizing the water swelling performance of the clay, and bound water can be formed by a saturated oil method to be more similar to a real oil reservoir.
In the embodiment of the invention, the inner wall surface of the experimental model is covered with a waterproof channeling coating, the waterproof channeling coating is formed by mixing low molecular polyamide resin and epoxy resin, the ratio of the low molecular polyamide resin to the epoxy resin is 3:5, and the surface of the waterproof channeling coating can be covered with a layer of fine sand.
Fig. 7 is a sectional view of an experimental model provided in an embodiment of the present invention, as shown in fig. 7, water may enter along a smooth wall in a displacement process due to the smooth wall of the model, so that a multilateral well may meet water in advance, and the water content may rapidly increase, which may affect the experimental result. Therefore, in consideration of the influence of "water channeling", the smooth wall surface is treated with epoxy resin to increase the roughness of the wall surface. Firstly, preparing epoxy resin, and mixing low-molecular polyamide resin and epoxy resin according to the ratio of 3: 5. And then uniformly coating the smooth wall surface, covering fine sand on the surface of the smooth wall surface, and finally drying the smooth wall surface to increase the roughness of the wall surface. (note: the blending and smearing process of the epoxy resin needs a gas mask).
Fig. 5 is a structural diagram of an experimental model of a multilateral well according to an embodiment of the present invention, and as shown in fig. 5, the experimental model is different from the experimental model 400 shown in fig. 4 in that a plurality of edge water simulation units 404 are disposed on an inner wall of the experimental model 500.
In the embodiment of the present invention, two side water simulation units 404 are installed on the inner wall surface of the experimental model 500, the side water simulation units 404 are circular narrow tubes with holes, wherein the small holes are uniformly distributed, the surfaces of the narrow tubes are wrapped with gauze, the diameter of the circular tube can be 4mm, and the diameter of the water outlet hole can be 0.5 mm. In the experimental process, water can be injected into the boundary water simulation unit 404, and uniform water outlet of each small hole is ensured, so that boundary water simulation is realized.
In the embodiment of the present invention, as shown in fig. 5, a multilateral well model 405 is disposed in the upper part 401 of the experimental model 500, the multilateral well model 405 is located about 2cm above the probe, the toe end is 5cm away from the inner wall of the model, and the heel end is connected to the wall surface.
Fig. 6 is a well pattern design diagram of a multilateral well model provided in an embodiment of the present invention, and as shown in fig. 6, the multilateral well model is a multilateral well model, and includes a main wellbore and at least one branch, and may also be two branches, three branches, or four branches, and the branches may be distributed on the same side or different sides of the main wellbore, or may be continuously distributed on the same (different) side, and distributed at intervals on the same (different) side, and symmetrically distributed. The angle of each branch to the main wellbore may be 15 °, 30 °, 45 °, 60 °, 75 °, or 90 °.
The multilateral well experimental model provided by the embodiment of the invention effectively simulates the influence of oil deposit, edge water and bottom water on the productivity of the multilateral well and the distribution of a near-well pressure field, so that the simulation is closer to various different boundaries such as bottom water, edge water, sealing and the like in a real oil deposit environment, and the influence of different boundary conditions on the productivity of an oil well is obtained.
The method effectively simulates the energy production and the well-entering pressure field distribution of the multilateral and multi-well multilateral wells, can know the influence of the geometric factors of the multilateral wells on the exploitation of oil reservoirs with different boundaries of the multilateral wells, and provides a theoretical basis for the well-type optimization of the multilateral wells.
Effectively prevents water channeling, and adopts a special sand filling and saturation method to manufacture a sand filling model with lower permeability, so that the simulation is closer to the real condition of the oil reservoir, and a foundation is laid for the success of the experiment.
Example two
Fig. 8 is a structural diagram of a multilateral well experiment system according to an embodiment of the present invention, and as shown in fig. 8, a multilateral well experiment system 800 includes:
multilateral well experimental model 801, multilateral well experimental model 801 may be multilateral well experimental model 400 or 500 described in example one in the present embodiment.
And the pressure sensing device 802 is connected with the multilateral well experimental model 801 and is used for sensing pressures at different positions in the multilateral well experimental model 801 and generating voltage signals.
And the data processing device 803 is connected to the pressure sensing device 802 and is configured to receive the voltage signal and generate simulation result data. In the embodiment of the present invention, the data processing device 803 may receive the voltage signal transmitted by the pressure sensing device 802, convert the voltage signal into pressure and display the pressure, and all the obtained data may be automatically stored for later processing.
In the embodiment of the invention, a multilateral well experiment system introduces a multilateral well near-well flow simulation software system to realize data acquisition and processing. The system comprises six parts, namely an operating system, data display, a real-time curve, data playback, curve playback, calibration operation and the like. The main function of the operating system is to open/close a serial port between the operating system and the sensor, realize the transmission and conversion of signals and automatically convert received voltage signals into pressure signals; the data display part mainly has the functions of displaying acquired real-time data, pressure distribution and voltage signals; the real-time curve part mainly displays the pressure change curve of each measuring point in the whole experiment process; the data playback and curve playback part has the main function of storing and processing the acquired data and images; the calibration operation mainly has the function of determining the conversion relation between the voltage signal and the pressure signal and realizing the automatic conversion between the signals.
Fig. 9 is a structural diagram of a pressure sensing apparatus according to an embodiment of the present invention, and as shown in fig. 9, a pressure sensing apparatus 802 may include:
the pressure sensing unit 901 is used for collecting pressure signals at different positions in the experimental model, and in the experimental process, the sensor can sense the pressure signals at different positions in the model. In an embodiment of the present invention, the pressure sensing device 802 may include 49 pressure sensing units 901.
And the calibration unit 902 is used for storing the conversion relation information between the pressure signal and the voltage signal, and before an experiment, the pressure signal is firstly pressurized and calibrated by using a calibration device. The purpose of the pressurizing is to ensure that each pressure sensing unit 901 works normally; the calibration is aimed at determining the conversion relationship of the pressure signal and the voltage signal.
And a voltage conversion unit 903, configured to convert the pressure signal into the voltage signal and output the voltage signal.
The multilateral well experiment system provided by the embodiment of the invention effectively simulates an oil reservoir, and the real-time measurement of the multilateral well near-well pressure field distribution is successfully realized by using the pressure sensing system, so that the measured pressure distribution is more accurate. The method provides a basis for researching the pressure field distribution around the multilateral well, exploring the bottom water coning position, delaying the bottom water coning and scientifically exploiting the multilateral well bottom water reservoir.
The data processing device is in butt joint with the pressure sensing device, so that the pressure of a measuring point in the model can be monitored in real time; displaying a near-well pressure field distribution diagram, and capturing a picture in real time; and collecting the obtained data and automatically storing the data. The near-well pressure distribution diagram of the multilateral well is obtained by processing the near-well pressure data of the multilateral well, and then the oil-water two-phase seepage rule and the flooding rule are obtained. Greatly improves the experimental efficiency and lays a good foundation for the simulation of larger physical model experiments and more complex oil reservoir conditions in the future.
EXAMPLE III
The utility model provides a multilateral well experiment model limit water analogue means, limit water analogue means set up in the inner wall of experiment model on, limit water analogue means for the annular tube of parcel gauze, the diameter of annular tube be 4mm, the annular tube on all with distribute a plurality of apopores, the diameter of apopore be 0.5 mm.
As shown in fig. 5, the side water simulation device 404 is disposed on the inner wall surface of the experimental model 500, the side water simulation device 404 is a circular thin tube with holes, wherein the holes are uniformly distributed, the surface of the thin tube is wrapped by a gauze, the diameter of the circular tube can be 4mm, and the diameter of the water outlet hole can be 0.5 mm. In the experimental process, water can be injected into the edge water simulation device 404, and uniform water outlet of each small hole is ensured, so that edge water simulation is realized.
The multilateral well experimental model edge water simulation device provided by the embodiment of the invention effectively simulates the influence of oil deposit, edge water and bottom water on the productivity of the multilateral well and the distribution of a near-well pressure field, so that the simulation is closer to various different boundaries such as bottom water, edge water, sealing and the like in a real oil deposit environment, and the influence of different boundary conditions on the productivity of an oil well is obtained.
Example four
Fig. 10 is a flow chart of a sand-packing method for a multilateral well experimental model according to an embodiment of the present invention, and as shown in fig. 10, the sand-packing method includes the following steps:
s601, uniformly mixing fine sand and clay according to a ratio of 4: 1;
s602, filling the mixed fine sand and clay mixture into an experimental model by a dry filling method and compacting;
s603, injecting water into the experimental model until the experimental model is saturated;
s604, the experimental model is driven to be saturated with water by using white oil.
In the embodiment of the invention, the experimental sand is prepared by mixing fine sand (200 meshes) and clay to simulate the stratum, and the mixture of the fine sand and the clay in different proportions can obtain different permeabilities. In the technology, a large number of experiments prove that the fine sand and the clay are optimally mixedThe total ratio is 4:1, and the permeability of the experimental sand is 33 multiplied by 10-3μm2
In the experimental process, firstly, fine sand and clay are uniformly mixed according to the optimal proportion, then, a dry filling method is adopted for filling sand, and experimental sand is filled into a device and compacted. In order to ensure that the compaction degree is better and lower permeability is obtained, the technique adopts a method of filling sand layer by layer and compacting layer by layer to fill. After sand filling, the operation of saturated water is carried out, and then white oil with specific viscosity (the viscosity of the white oil is 115mPa & s at 25 ℃) is used for displacing the water until the oil is saturated. According to the method, a sand filling model with lower permeability can be obtained by utilizing the water swelling performance of the clay, and bound water can be formed by a saturated oil method to be more approximate to a real oil reservoir.
In the embodiment of the invention, the inner wall surface of the experimental model is covered with a waterproof channeling coating, the waterproof channeling coating is formed by mixing low molecular polyamide resin and epoxy resin, the ratio of the low molecular polyamide resin to the epoxy resin is 3:5, and the surface of the waterproof channeling coating can be covered with a layer of fine sand.
The sand filling method of the multilateral well experimental model provided by the invention can obtain the sand filling model with lower permeability by utilizing the water swelling performance of the clay, and when the ratio of the fine sand to the clay is 4: at 1, the laboratory had the lowest permeability. The white oil is used for driving the experimental model to be saturated, bound water can be formed in the experimental model, and the oil reservoir is closer to a real oil reservoir. Therefore, the sand filling model with low permeability is obtained by adopting the sand filling and oil saturation generation method mixed in a special proportion, so that the experimental model is closer to the real condition of the oil reservoir, and a foundation is laid for the success of the experiment.
EXAMPLE five
As shown in fig. 7, the water channeling prevention coating covers the inner wall surface of the multilateral well experimental model, and is formed by mixing low molecular polyamide resin and epoxy resin in a ratio of 3: 5.
In the embodiment of the invention, water enters along the smooth wall surface in the displacement process due to the smooth wall surface of the model, so that the multilateral well is exposed to water in advance, the water content is increased rapidly, and the experimental result is influenced. Therefore, in consideration of the influence of "water channeling", the smooth wall surface is treated with epoxy resin to increase the roughness of the wall surface. Firstly, preparing epoxy resin, and mixing low-molecular polyamide resin and epoxy resin according to the ratio of 3: 5. And then uniformly coating the smooth wall surface, covering fine sand on the surface of the smooth wall surface, and finally drying the smooth wall surface to increase the roughness of the wall surface. (note: the blending and smearing process of the epoxy resin needs a gas mask).
The waterproof channeling coating provided by the embodiment of the invention effectively prevents water channeling, enables simulation to be closer to the real condition of an oil reservoir, and lays a foundation for success of experiments.
EXAMPLE six
Fig. 11 is a flow chart of a method for preventing water channeling in an experimental model of a multilateral well according to an embodiment of the present invention, and as shown in fig. 11, the method includes the following steps:
s701, uniformly mixing low-molecular polyamide resin and epoxy resin according to a ratio of 3: 5;
s702, smearing the mixture of the mixed low-molecular polyamide resin and epoxy resin on the inner wall surface of the experimental model to form a waterproof channeling coating;
s703, uniformly covering a layer of fine sand on the surface of the waterproof channeling coating;
and S704, drying the waterproof channeling coating covered with the fine sand.
In the embodiment of the invention, water enters along the smooth wall surface in the displacement process due to the smooth wall surface of the model, so that the multilateral well is exposed to water in advance, the water content is increased rapidly, and the experimental result is influenced. Therefore, in consideration of the influence of "water channeling", the smooth wall surface is treated with epoxy resin to increase the roughness of the wall surface. Firstly, preparing epoxy resin, and mixing low-molecular polyamide resin and epoxy resin according to the ratio of 3: 5. And then uniformly coating the smooth wall surface, covering fine sand on the surface of the smooth wall surface, and finally drying the smooth wall surface to increase the roughness of the wall surface. (note: the blending and smearing process of the epoxy resin needs a gas mask).
The multilateral well experimental model water channeling prevention method provided by the embodiment of the invention effectively prevents water channeling, enables simulation to be closer to the real condition of an oil reservoir, and lays a foundation for success of experiments.
The multilateral well experimental model, the multilateral well experimental system and the sand filling method provided by the embodiment of the invention have the following advantages:
the oil reservoir is effectively simulated, the real-time measurement of the multilateral well near-well pressure field distribution is successfully realized by using the pressure sensing system, and the measured pressure distribution is more accurate. The method provides a basis for researching the pressure field distribution around the multilateral well, exploring the bottom water coning position, delaying the bottom water coning and scientifically exploiting the multilateral well bottom water reservoir.
The influence of the edge water and the bottom water on the productivity of the multilateral well and the distribution of a near-well pressure field is effectively simulated, so that the simulation is closer to various different boundaries such as the bottom water, the edge water, the sealing and the like in a real oil reservoir environment, and the influence of different boundary conditions on the productivity of the oil well is obtained.
The method effectively simulates the energy production and the well-entering pressure field distribution of the multilateral and multi-well multilateral wells, can know the influence of the geometric factors of the multilateral wells on the exploitation of oil reservoirs with different boundaries of the multilateral wells, and provides a theoretical basis for the well-type optimization of the multilateral wells.
The data processing device is in butt joint with the pressure sensing device, so that the pressure of a measuring point in the model can be monitored in real time; displaying a near-well pressure field distribution diagram, and capturing a picture in real time; and collecting the obtained data and automatically storing the data. The near-well pressure distribution diagram of the multilateral well is obtained by processing the near-well pressure data of the multilateral well, and then the oil-water two-phase seepage rule and the flooding rule are obtained. Greatly improves the experimental efficiency and lays a good foundation for the simulation of larger physical model experiments and more complex oil reservoir conditions in the future.
Effectively prevents water channeling, and adopts a special sand filling and saturation method to manufacture a sand filling model with lower permeability, so that the simulation is closer to the real condition of the oil reservoir, and a foundation is laid for the success of the experiment.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (4)

1. A sand filling method of a multilateral well experimental model is characterized by comprising the following steps:
uniformly mixing fine sand and clay according to the ratio of 4: 1;
filling the mixed fine sand and clay mixture into an experimental model by adopting a dry filling method and compacting, wherein the experimental model is a square container, the interior of the experimental model can bear high pressure of 12MPa, the upper part of the experimental model is filled with the mixed fine sand and clay mixture, the lower part of the experimental model is used for filling bottom water, a bottom water diffusion plate is arranged between the upper part and the lower part of the experimental model, a layer of gauze is arranged between the bottom water diffusion plate and the upper part of the experimental model, a plurality of edge water simulation units are arranged on the inner wall of the experimental model, a multi-branch well model is arranged in the upper part of the experimental model, the multi-branch well model is a multi-branch horizontal well model, the multi-branch horizontal well model is positioned 2cm above a pressure sensing unit of a pressure sensing device, and the toe end of the multi-branch horizontal well model is 5cm away from the inner wall of the experimental model, the heel end of the multi-branch horizontal well model is connected with the wall surface of the experimental model, and the inner wall surface of the experimental model is covered with a waterproof channeling coating;
injecting water into the experimental model until the experimental model is saturated;
the experimental model was flooded with water to oil saturation using white oil.
2. The method of sand packing of a multilateral well experimental model according to claim 1, characterized in that the white oil has a viscosity of 115 mPa-s at 25 ℃.
3. The method of claim 1, wherein the fine sand is 200 mesh fine sand.
4. The sand-filling method of the multilateral well experimental model according to claim 1, wherein the filling the mixed fine sand and clay mixture into the experimental model and compacting by the dry-filling method comprises:
and dry-filling the mixed fine sand and clay mixture into an experimental model in a manner of filling sand layer by layer and compacting layer by layer.
CN201610693430.5A 2012-06-01 2012-06-01 Sand filling method of multilateral well experimental model Active CN106223928B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201210180178.XA CN102704911B (en) 2012-06-01 2012-06-01 A kind of multilateral well experimental model, system and back-up sand method
CN201610693430.5A CN106223928B (en) 2012-06-01 2012-06-01 Sand filling method of multilateral well experimental model

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610693430.5A CN106223928B (en) 2012-06-01 2012-06-01 Sand filling method of multilateral well experimental model

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CN201210180178.XA Division CN102704911B (en) 2012-06-01 2012-06-01 A kind of multilateral well experimental model, system and back-up sand method

Publications (2)

Publication Number Publication Date
CN106223928A CN106223928A (en) 2016-12-14
CN106223928B true CN106223928B (en) 2020-01-03

Family

ID=46897936

Family Applications (2)

Application Number Title Priority Date Filing Date
CN201210180178.XA Active CN102704911B (en) 2012-06-01 2012-06-01 A kind of multilateral well experimental model, system and back-up sand method
CN201610693430.5A Active CN106223928B (en) 2012-06-01 2012-06-01 Sand filling method of multilateral well experimental model

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CN201210180178.XA Active CN102704911B (en) 2012-06-01 2012-06-01 A kind of multilateral well experimental model, system and back-up sand method

Country Status (1)

Country Link
CN (2) CN102704911B (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103104254B (en) * 2013-01-24 2015-05-20 西南石油大学 Multifunctional oil reservoir simulation experiment device and experiment method thereof
CN103247215B (en) * 2013-04-12 2015-08-05 中国石油天然气股份有限公司 Low-permeability oil deposit commingling production physical simulation system and method
CN103397872B (en) * 2013-08-06 2016-07-13 中国海洋石油总公司 The pit shaft analog of racemosus water conservancy diversion moderate leading well
CN103967458B (en) * 2014-02-25 2016-03-23 中国海洋石油总公司 A kind of sand control section water drive method
CN104196527B (en) * 2014-08-13 2017-06-16 中国石油大学(北京) Multilateral well productivity simulation system and multilateral well productivity simulation experimental technique
CN105971569B (en) * 2016-05-17 2018-08-03 东北石油大学 A kind of indoor experimental apparatus of simulation herring-bone form multi-branched horizontal well
CN106285586B (en) * 2016-09-30 2018-12-11 东北石油大学 A kind of apparatus and method of simulation set damage process
CN106869914B (en) * 2017-03-09 2020-07-28 长江大学 Production capacity prediction method for coupling seepage in oil layer with flow in shaft
CN108979607B (en) * 2018-07-10 2020-09-04 中国海洋石油集团有限公司 High-temperature-resistant high-salt sand filling pipe with internal ring cementation and anti-channeling
CN112302592A (en) * 2019-07-30 2021-02-02 中国石油天然气股份有限公司 Meandering stream point dam sand body water displacement of reservoir oil simulation experiment equipment
CN112780241B (en) * 2021-03-05 2022-03-11 西南石油大学 Method for partitioning quantitative saturated bound water of planar heterogeneous large flat plate model
CN113266345A (en) * 2021-06-28 2021-08-17 中国石油化工股份有限公司 Reservoir simulation unit and gas dissolution distribution evaluation device and evaluation method thereof
CN113719261A (en) * 2021-09-27 2021-11-30 北京红蓝黑能源科技有限公司 Method for improving economic benefit of single well by exploiting oil gas through bottom water steam flooding

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7312428B2 (en) * 2004-03-15 2007-12-25 Dwight Eric Kinzer Processing hydrocarbons and Debye frequencies
CN101793137A (en) * 2010-01-29 2010-08-04 西南石油大学 Oil-water displacement efficiency experimental method of longitudinal and planar nonhomogeneous slab models
CN101798921A (en) * 2010-02-21 2010-08-11 大庆油田有限责任公司 Corestone manufacture method
CN101831924A (en) * 2010-04-21 2010-09-15 上海交通大学 Simulator for blocking groundwater seepage by underground structure
CN102022112A (en) * 2010-11-04 2011-04-20 中国石油大学(华东) Intelligent oil well simulation experiment system and working method
CN102062742A (en) * 2010-12-15 2011-05-18 大连理工大学 Sand-filling type clamp fastener for nuclear magnetic resonance imaging

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101476458B (en) * 2008-12-03 2010-12-08 刘其成 Oil pool development simulation system, oil pool model body and its data processing method
CN101800000B (en) * 2009-10-30 2011-08-03 中国石油天然气股份有限公司 Natural gas exploitation simulator of multi-angle horizontal branch well
CN102434151B (en) * 2011-12-19 2015-04-29 中国海洋石油总公司 Bottom-water coning dynamic simulation experiment device in bottom-water oil reservoir development and simulation system
CN202937246U (en) * 2012-06-01 2013-05-15 中国石油大学(北京) Multilateral well experimental model and edge water stimulation device and multilateral well experimental system thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7312428B2 (en) * 2004-03-15 2007-12-25 Dwight Eric Kinzer Processing hydrocarbons and Debye frequencies
CN101793137A (en) * 2010-01-29 2010-08-04 西南石油大学 Oil-water displacement efficiency experimental method of longitudinal and planar nonhomogeneous slab models
CN101798921A (en) * 2010-02-21 2010-08-11 大庆油田有限责任公司 Corestone manufacture method
CN101831924A (en) * 2010-04-21 2010-09-15 上海交通大学 Simulator for blocking groundwater seepage by underground structure
CN102022112A (en) * 2010-11-04 2011-04-20 中国石油大学(华东) Intelligent oil well simulation experiment system and working method
CN102062742A (en) * 2010-12-15 2011-05-18 大连理工大学 Sand-filling type clamp fastener for nuclear magnetic resonance imaging

Also Published As

Publication number Publication date
CN106223928A (en) 2016-12-14
CN102704911B (en) 2016-08-03
CN102704911A (en) 2012-10-03

Similar Documents

Publication Publication Date Title
CN106223928B (en) Sand filling method of multilateral well experimental model
CN103411751B (en) Water grouting test device is moved in a kind of visual intersection crack
CN102518421B (en) Physical simulation visualization experimental device and forming method thereof
CN106018740B (en) Hole pressure touching methods demarcate can system
CN103527185A (en) Horizontal-well physical simulation experiment device and experimental method thereof
CN108195723B (en) Permeation grouting test system and method for reinforcing loose gravel soil
CN101672761A (en) Device and method for testing soil-water characteristic curve of sandy soil
CN104005363A (en) Three-dimensional underground pressure-bearing water flow-subway tunnel structure interaction simulating device
CN202937246U (en) Multilateral well experimental model and edge water stimulation device and multilateral well experimental system thereof
CN205538580U (en) Indoor survey device of fissuted medium system infiltration tensor
CN203769767U (en) Horizontal-well physical simulation experiment device
CN107831106B (en) Intelligent permeability measurement test bed
CN110924933A (en) Visual experiment method for dynamically simulating shale fracturing fracture network
CN105547967A (en) Indoor measuring device for permeability tensor of fissure medium system
Liu et al. Visual representation and characterization of three-dimensional hydrofracturing cracks within heterogeneous rock through 3D printing and transparent models
CN106198890A (en) A kind of indoor grouting simulation test device and using method thereof
CN104563982A (en) High-temperature high-pressure dry gas injection longitudinal wave and efficiency testing device and method for gas condensate reservoir
CN105298488A (en) Diversion capacity testing method under non-continuous filling mode
CN103389260A (en) Laboratory simulation test method for researching underground water seepage obstruction caused by pile foundation
CN104062408B (en) A kind of delamination pour slurry model assay systems
CN202417477U (en) Physical simulation visual experimental device
CN105043938A (en) Reusable saturated sand layer permeation grouting test model and applications thereof
CN209145580U (en) A kind of three axis multiple cracks hydraulic fracturing experiments devices
CN205262912U (en) Experimental device for it constructs sludge -biofilm formation to be used for simulating shield
CN110456028A (en) It is a kind of can be with the grouting test device and method of independent control three-dimensional stress state

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant