CN113818853A - Experimental device for simulating steam injection of SAGD horizontal well and application method thereof - Google Patents
Experimental device for simulating steam injection of SAGD horizontal well and application method thereof Download PDFInfo
- Publication number
- CN113818853A CN113818853A CN202110507552.1A CN202110507552A CN113818853A CN 113818853 A CN113818853 A CN 113818853A CN 202110507552 A CN202110507552 A CN 202110507552A CN 113818853 A CN113818853 A CN 113818853A
- Authority
- CN
- China
- Prior art keywords
- sagd
- experimental
- model
- steam injection
- steam
- 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.)
- Pending
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2406—Steam assisted gravity drainage [SAGD]
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing 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 belongs to the technical field of heavy oil reservoir SAGD exploitation, and particularly relates to an experimental device for simulating steam injection of an SAGD horizontal well. The experimental device for simulating the steam injection of the SAGD horizontal well comprises an experimental steam injection system, an experimental fluid injection system, an SAGD experimental model connected with the experimental fluid injection system, a produced liquid cooling and collecting system and a data processing system; the horizontal well model is respectively connected with the experimental steam injection system and the produced liquid cooling and collecting system. The experimental device can flexibly complete simulation of SAGD processes of the horizontal well in different steam injection modes along the journey direction, accurately represent the change rule of the horizontal well productivity in different steam injection modes, obtain reliable experimental data, and provide experimental basis for subsequently solving the problem of uneven steam injection of the SAGD horizontal well along the journey.
Description
Technical Field
The invention belongs to the technical field of heavy oil reservoir SAGD exploitation, and particularly relates to an experimental device for simulating SAGD horizontal well steam injection and an application method thereof.
Background
With the increasing demand for oil and the constant development and consumption of conventional oil and gas resources, the unconventional heavy oil status in energy structures is becoming more and more important. Among the ascertained petroleum resources, the proportion of thick oil is increasing.
The heavy oil is a common organic mixture and is mainly characterized by high content of asphaltene and colloid, few light fractions, high viscosity and very complex composition. It has high viscosity under the condition of stratum and is not easy to be exploited. At present, the conventional oil and gas exploitation is in the bottleneck period, and the development and utilization of the heavy oil increasingly become the hot point of attention in the oil industry. Steam Assisted Gravity Drainage (SAGD) is an effective means of developing heavy oil reservoirs.
Steam Assisted Gravity Drainage (SAGD) is one of the most effective development methods for exploiting heavy oil reservoirs, and a prior experiment is carried out in Canada and the like and is gradually applied to production practice. Production practice shows that the SAGD technology is greatly helpful for improving the development effect of the thickened oil. But the problem of uneven steam injection along the well direction in long horizontal well sections occurs in the practice of SAGD production. The phenomenon of uneven development of the steam suction profile seriously affects the development effect of the heavy oil reservoir and causes the adverse effects of low recovery degree and low economic efficiency of the reservoir.
If the development rule of the steam suction profile can be visually observed, then the steam injection of the SAGD horizontal well section can be systematically researched, the development rule of the steam suction profile along the horizontal well section can be comprehensively known, and the method has important practical significance for improving the development effect of the SAGD horizontal well. Therefore, an experimental device capable of simulating steam injection of the SAGD horizontal well with high accuracy and high flexibility is needed.
Disclosure of Invention
The invention aims to provide an experimental device for simulating SAGD horizontal well steam injection and an application method thereof, aiming at the defects, the experimental device can flexibly complete the simulation of the SAGD process of the horizontal well in different steam injection modes along the process direction, accurately represent the change rule of the horizontal well productivity in different steam injection modes, obtain reliable experimental data, and provide experimental basis for subsequently solving the problem of uneven steam injection of the SAGD horizontal well along the process.
The technical scheme of the invention is as follows: an experimental device for simulating steam injection of an SAGD horizontal well comprises an experimental steam injection system, an experimental fluid injection system, an SAGD experimental model connected with the experimental fluid injection system, a produced liquid cooling and collecting system and a data processing system; the horizontal well model is respectively connected with the experimental steam injection system and the produced liquid cooling and collecting system; the horizontal well model is a detachable SAGD injection well; the steam injection well and the production well are horizontally inserted into the SAGD experimental model and are sealed with the SAGD experimental model through a graphite sealing ring; the tubular column structure of steam injection well and production well is as follows:
(1) the steam injection well and the production well are both of parallel double-pipe structures, the pipe column structures are the same, two oil pipes in the steam injection well and two oil pipes in the production well are both positioned at the heel end of the SAGD experiment model, the length of the horizontal section is 0cm, and four oil pipes are all provided with holes at the tail ends; steam is injected from the heel end of the SAGD experimental model in the formal production stage; the pipe column structure of the steam injection well and the production well is suitable for the conventional steam injection mode;
(2) the steam injection well and the production well are both of a parallel double-pipe structure, two oil pipes in the steam injection well are a short pipe and a long pipe, the short pipe is positioned at the heel end of the SAGD experimental model, and the length of the horizontal section is 0 cm; the long pipe extends to the toe end of the SAGD experimental model; two oil pipes in the production well are both positioned at the heel end of the SAGD experimental model, and the lengths of the horizontal sections are both 0 cm; the four oil pipes are all provided with holes at the tail ends; steam is injected from the heel end and the toe end of the SAGD experimental model at the same time in the formal production stage; the pipe column structure of the steam injection well and the production well is suitable for a double-pipe steam injection mode;
(3) the steam injection well and the production well are both of a parallel double-pipe structure, two oil pipes in the steam injection well are a short pipe and a long pipe, the short pipe is positioned at the heel end of the SAGD experimental model, and the length of the horizontal section is 0 cm; the long pipe extends to the toe end of the SAGD experimental model; the tail end of the short pipe is provided with a hole, and the tail end of the long pipe is closed; steam injection points are uniformly distributed on the long pipe, and the aperture of each steam injection point is gradually increased from the heel end to the toe end of the SAGD experimental model; two oil pipes in the production well are both positioned at the heel end of the SAGD experimental model, and the tail end of the SAGD experimental model is provided with a hole; steam is injected along steam injection points uniformly distributed on a long pipe of the steam injection well in the formal production stage; the pipe column structure of the steam injection well and the production well is suitable for a multi-point steam injection mode;
and slotted screen pipes are sleeved outside the oil pipes to prevent sand.
The diameter of a steam injection point at the heel end of the tubular column structure (3) of the steam injection well and the production well is 1.5mm, the diameter of a steam injection point at the middle section is 2mm, and the diameter of a steam injection point at the toe end is 3 mm.
The experimental steam injection system comprises a high-precision constant-pressure constant-speed pump and a steam generator; the high-precision constant-pressure constant-speed pump is connected with a water inlet of the steam generator through a water injection pipeline, a steam inlet pipeline and an emptying pipeline are connected in parallel at a steam exhaust end of the steam generator, and the steam inlet pipeline is connected with the horizontal well model; the steam generator is provided with a pressure gauge.
The experimental fluid injection system at least comprises a constant-pressure constant-speed pump, a simulated formation water container, a crude oil container and a pipeline heat tracing system; the simulated formation water container and the crude oil container are connected with the constant-pressure constant-speed pump in a parallel connection mode, the output end of the simulated formation water container is connected with the lower fluid injection port of the SAGD experiment model through a water inlet pipeline, and the output end of the crude oil container is connected with the upper or lower fluid injection port of the SAGD experiment model through an oil inlet pipeline of the winding heat tracing system.
The SAGD experimental model at least comprises a temperature sensor and a pressure sensor; a detachable SAGD injection and production well reserved hole is formed in the SAGD experiment model; fluid injection ports are uniformly formed in the upper part and the lower part of the SAGD experimental model and are connected with an experimental fluid injection system; and sand filling openings are distributed at the upper part of the SAGD experimental model.
The bottom of the SAGD experimental model is provided with a rotatable base which is connected with a hand crank through a gear box; a heat insulation layer is arranged inside the SAGD experiment model, a guide rail type constant temperature box is arranged outside the SAGD experiment model, a temperature sensor and a pressure sensor are integrated on the constant temperature box, and the temperature of the constant temperature box is 10-200 ℃; preferably, the oven temperature is set to 80 ℃.
The output liquid cooling and collecting system comprises an output pipeline wound with a heat tracing system, a sand filter, a condenser and a back pressure valve; the condenser consists of a water bath circulating condensation pipe and a water bath circulating device, and the temperature of the water bath circulating device is 10-100 ℃; the back pressure valve is connected with the hand pump, and the hand pump is used for controlling the output pressure of the back pressure valve; the mesh number of the sand filter is 200 meshes; the temperature of the water bath circulating device is 80 ℃.
The data processing system comprises a data acquisition module and a computer.
The application method of the simulated SAGD horizontal well steam injection experiment device comprises the following steps:
(1) mixing according to a required proportion to prepare quartz sand, heating an oil sample in a constant temperature box, preparing distilled water, and preparing a NaCl solution with the concentration of 0.5%;
(2) the pipeline connects all the devices, the injection pipeline wraps the heat insulation material, and the extraction pipeline is wound by a heating belt; checking whether the temperature and pressure sensors display accurately, assembling the model, filling the mixed quartz sand into the inner cavity of the model through four sand filling ports at the top of the SAGD experimental model, compacting, sealing a sand filling port plug, and detecting the air tightness of the model by using nitrogen;
(3) vacuumizing the sand filling by using a vacuumizing pump, and closing a fluid injection port; connecting a crude oil container with a fluid injection port, opening a pipeline valve, and pumping the prepared 0.5% NaCl solution into an SAGD experimental model; recording the total volume of the pumped liquid and calculating the porosity of the model according to the volume of the model; opening a valve of the collecting pipeline after water is saturated, recording the pressure difference under different injection rates, and calculating the permeability of the model according to a Darcy formula;
(4) adding back pressure to PrOpening a heating switch of the constant temperature box, setting the temperature of the constant temperature box to be 80 ℃, and continuously injecting a NaCl solution into the sand filling model to pressurize to P after the temperature of the whole SAGD experimental model is heated to 80 DEG Cr；
(5) Heating a crude oil container and crude oil therein to 80 ℃, connecting a piston container to a fluid injection port at the upper part of a sand filling model, saturating thick oil into the sand filling model through a pump, displacing water in pores, and calculating the oil saturation and the irreducible water saturation according to the volume of the injected crude oil;
(6) heating and pressurizing distilled water to an experimental design saturated steam state, injecting the distilled water into a sand filling model at a certain flow rate, and starting an SAGD process;
(7) opening a data acquisition system, and recording the change conditions of a pressure field and a temperature field in the sand filling model in the experimental process so as to judge the growth condition of a steam cavity in the SAGD process; collecting the oil-water emulsion produced in each time period;
(8) weighing the produced oil-water emulsion in several times to obtain the instantaneous liquid production amount in unit time, setting the temperature of a constant temperature box to be 100 ℃, then putting the oil-water emulsion into the constant temperature box for drying, weighing the dried oil-water emulsion again to obtain the instantaneous oil production amount in unit time, and finally processing the experimental result to obtain the accumulated oil production rate, the accumulated oil production amount and the recovery ratio;
(9) after production, firstly, pressure relief and temperature reduction treatment are carried out; and opening the sand filling model, observing the development condition of the steam cavity and taking a picture.
The invention has the beneficial effects that: the invention innovatively designs an experimental device for simulating steam injection of the SAGD horizontal well, by designing different tubular column structures of an injection and production well of a horizontal well model, the SAGD process of different steam injection modes of the horizontal well along the journey direction can be simulated flexibly, quickly and reasonably, the distribution rule of the air suction section in the steam injection process of the SAGD horizontal well can be observed and researched visually, the change rule of the horizontal well productivity in different steam injection modes can be represented accurately, reliable experimental data can be obtained, and experimental basis is provided for solving the problem of nonuniform steam injection of the SAGD horizontal well along the journey.
Drawings
FIG. 1 is a schematic structural diagram of the simulated SAGD horizontal well steam injection experimental device.
FIG. 2 is a schematic diagram of the structure of a steam injection well and a production well in a horizontal well model in a conventional steam injection mode.
FIG. 3 is a schematic diagram of the structure of the steam injection well and the production well in the horizontal well model in a double-pipe steam injection mode.
FIG. 4 is a schematic diagram of the pipe column structure of the steam injection well and the production well in the horizontal well model in a multi-point steam injection mode.
FIG. 5 is a schematic diagram of the development of the steam cavity when the SAGD experiment is simulated for 100 min.
FIG. 6 is a schematic diagram of the development of the steam cavity when the SAGD experiment is simulated for 300 min.
FIG. 7 is a schematic diagram of the development of the steam cavity when the SAGD experiment is simulated for 500 min.
FIG. 8 is a schematic view of a pressure field during a SAGD experiment.
FIG. 9 is a graph of instantaneous oil production rate over time during a SAGD experiment.
FIG. 10 is a graph showing the change of water content with time during the SAGD experiment.
Wherein, 1 is an experimental steam injection system, 2 is an experimental fluid injection system, 3 is an SAGD experimental model, and 4 is a produced liquid cooling and collecting system; 5 is a data processing system, 6 is a constant-pressure constant-speed pump, 7 is a steam generator, 8 is a horizontal well model, 9 is a simulated formation water container, 10 is a crude oil container, 11 is a pipeline heat tracing system, 12 is a fluid injection port, 13 is a temperature sensor, 14 is a pressure sensor, 15 is an integrated thermometer, 16 is an integrated pressure gauge, 17 is a reserved hole of an SAGD injection and production well, 18 is a sand filling port, 19 is a guide rail type constant temperature box, 20 is a sand filter, 21 is a water bath circulating condenser pipe, 22 is a water bath circulating device, 23 is a back pressure valve, 24 is a hand pump, 25 is an extraction liquid collector, 26 is a production well, 27 is a steam injection well, 28 is an oil pipe, and 29 is a steam injection point.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
The experimental device for simulating the steam injection of the SAGD horizontal well comprises an experimental steam injection system 1, an experimental fluid injection system 2, an SAGD experimental model 3 connected with the experimental fluid injection system 2, a produced liquid cooling and collecting system 4 and a data processing system 5; the device also comprises a horizontal well model 8 which is respectively connected with the experimental steam injection system 1 and the produced liquid cooling and collecting system 4.
The experimental steam injection system 1 comprises a constant-pressure constant-speed pump 6 and a steam generator 7; the constant-pressure constant-speed pump 6 is connected with a water inlet of the steam generator 7 through a water injection pipeline, a steam inlet pipeline and an emptying pipeline are connected in parallel at a steam exhaust end of the steam generator 7, and the steam inlet pipeline is connected with the horizontal well model 8 and used for providing high-temperature high-pressure high-dryness steam for a circulation preheating stage and a formal production stage; the steam generator 7 is provided with a pressure gauge.
The experimental fluid injection system 2 at least comprises a constant-pressure constant-speed pump 6, a simulated formation water container 9, a crude oil container 10 and a pipeline heat tracing system 11; the simulated formation water container 9 and the crude oil container 10 are connected with the constant-pressure constant-speed pump 6 in parallel, the output end of the simulated formation water container 9 is connected with a fluid injection port at the lower part of the SAGD experiment model 3 through a water inlet pipeline, and the output end of the crude oil container 10 is connected with a fluid injection port 12 at the upper part or the lower part of the SAGD experiment model 3 through an oil inlet pipeline of a winding heat tracing system.
The SAGD experimental model 3 is 625mm long, 250mm high and 50mm thick. Comprises a temperature sensor 13, a pressure sensor 14, an integrated thermometer 15 and an integrated pressure gauge 16; a detachable SAGD injection and production well reserved hole 17 is formed in the SAGD experiment model 3; the upper part and the lower part of the SAGD experimental model 3 are respectively and uniformly provided with 3 fluid injection ports 12, and fluid can be alternately injected into the experimental model from different positions of the model, so that the injection uniformity of the fluid is ensured. The fluid injection port 12 is connected to the test fluid injection system 2; and sand filling ports 18 are distributed at the upper part of the SAGD experimental model 3.
The bottom of the SAGD experimental model 3 is provided with a rotatable base which is connected with a hand crank through a gear box; the SAGD experiment model 3 is internally provided with a heat insulation layer, the outside is provided with a guide rail type thermostat 19, a temperature sensor 13 and a pressure sensor 14 are integrated on the thermostat, and the thermostat temperature is set to 80 ℃.
The produced liquid cooling and collecting system 4 comprises a produced pipeline wound with a heat tracing system, a sand filter 20, a condenser and a back pressure valve; the condenser consists of a water bath circulating condensation pipe 21 and a water bath circulating device 22, and the temperature of the water bath circulating device 22 is 10-100 ℃; the back pressure valve 23 is connected with a hand pump 24, and the hand pump 24 is used for controlling the pressure output by the back pressure valve 23; the 20-mesh sand filter has 200 meshes; the temperature of the water bath circulation device 22 is 80 ℃.
The data processing system 5 comprises a data acquisition module and a computer.
The horizontal well model 8 is a detachable SAGD injection well; the injection and production well comprises a production well 26 and a steam injection well 27 positioned above the production well 26, wherein the steam injection well 27 and the production well 26 are horizontally inserted into the SAGD experimental model 3 and are sealed with the SAGD experimental model 3 through graphite sealing rings.
The method is suitable for a conventional steam injection mode, the steam injection well 27 and the production well 26 are both of a parallel double-pipe structure, the pipe column structures are the same, two oil pipes 28 in the steam injection well and two oil pipes 28 in the production well are both positioned at the heel end of the SAGD experiment model 3, the length of the horizontal section is 0cm, and four oil pipes 28 are all provided with holes at the tail ends; steam is injected from the heel end of the SAGD experimental model 3 in the formal production stage.
And slotted screen pipe sand control is sleeved outside the oil pipes 28.
The constant pressure and constant speed pump 6 is used to supply constant speed distilled water to the steam generator 7 and control the steam pressure. The steam generator 7 is used to heat the distilled water to saturated steam at a desired temperature and pressure and discharge the steam through a steam discharge port. The SAGD experiment model 3 is an experiment device for researching the uniform steam injection of the SAGD horizontal well, and a heat insulation layer arranged on the inner wall of the cavity is used for simulating the heat loss of the stratum;
the steam injection well 27 and the production well 26 can be detached, different types of injection and production wells are designed according to different steam injection modes and different underground pipe column structures, and the research on the influence of the different steam injection modes and pipe column structures on the steam distribution uniformity in the SAGD process is conveniently simulated; in the experimental process, the development condition of the steam suction profile of the oil deposit along the way of the horizontal well is observed through the uniformly distributed temperature sensors 13, so that the feasibility and the accuracy of the experiment are ensured. The output pipeline is wound with a heat tracing system for heating the crude oil in the pipeline to reduce viscosity, and the produced fine gravel is filtered by a sand filter 20 to prevent the fine gravel from blocking a back pressure valve 23; the water bath circulating condensation pipe 21 is used for cooling produced liquid flowing out of the production pipeline and controlling the temperature of the produced liquid through circulating distilled water of the circulating water thermostatic bath;
the produced liquid reaches the back pressure valve 23 after passing through the cooling of water bath circulation condenser pipe 21, controls back pressure valve 23 back pressure through hand pump 24, and when the produced liquid pressure is higher than back pressure valve 23 back pressure, the produced liquid can flow to the produced liquid collector 25 through the outlet end of back pressure valve 23. The produced liquid collector 25 is used for collecting SAGD produced liquid, can accurately measure the produced liquid amount, and provides parameters for subsequent production degree statistics.
A plurality of temperature sensors 13 and pressure sensors 14 are uniformly distributed in the model cavity, and the distance between every two adjacent temperature sensors 13 is 45 mm; the pressure sensors 14 are longitudinally spaced 67.5mm apart and are spaced 247.5mm apart.
The external of SAGD experiment model still is provided with guide tracked thermostated container 19, and the temperature of thermostated container sets up to 80 ℃. When the SAGD experiment model 3 is saturated with oil, the experiment model is heated to 80 ℃ by a constant temperature box, the viscosity of the thickened oil is reduced at the temperature of 80 ℃, the fluidity is very good, and the crude oil of the experiment model can be fully saturated.
The experimental device also comprises a data processing system 5, and temperature data and pressure data in the experimental process are obtained through the temperature sensor 13 and the pressure sensor 14 and recorded.
Example 2
The experimental device for simulating SAGD horizontal well steam injection is suitable for a double-pipe steam injection mode, the steam injection well 27 and the production well 26 are both in a parallel double-pipe structure, two oil pipes 28 in the steam injection well 27 are short pipes and long pipes, the short pipes are located at the heel end of the SAGD experimental model 3, and the length of the horizontal section is 0 cm; the long pipe extends to the toe end of the SAGD experimental model 3; two oil pipes 28 in the production well 26 are both positioned at the heel end of the SAGD experimental model 3, and the lengths of the horizontal sections are both 0 cm; the four oil pipes 28 are all provided with holes at the tail ends; steam is injected from the heel end and the toe end of the SAGD experimental model 3 at the same time in the formal production stage. The other structure is the same as embodiment 1.
Example 3
The experimental device for simulating SAGD horizontal well steam injection is suitable for a multi-point steam injection mode, the steam injection well 27 and the production well 26 are both of a parallel double-pipe structure, two oil pipes 28 in the steam injection well 27 are short pipes and long pipes, the short pipes are located at the heel end of the SAGD experimental model 3, and the length of the horizontal section is 0 cm; the long pipe extends to the toe end of the SAGD experimental model 3; the tail end of the short pipe is provided with a hole, and the tail end of the long pipe is closed; steam injection points 29 are uniformly distributed on the long pipe, and the aperture of each steam injection point 29 is gradually increased from the heel end to the toe end of the SAGD experimental model 3; two oil pipes 28 in the production well are both positioned at the heel end of the SAGD experimental model 3, and the tail end of the SAGD experimental model is provided with a hole; steam is injected along steam injection points 29 uniformly distributed on the long pipe of the steam injection well 27 in the formal production stage. Wherein the diameter of the steam injection point at the heel end is 1.5mm, the diameter of the steam injection point at the middle section is 2mm, and the diameter of the steam injection point at the toe end is 3 mm. The other structure is the same as embodiment 1.
The embodiment 3 illustrates an application method of the SAGD horizontal well uniform steam injection experimental device, which comprises the following steps:
(1) firstly, elutriating and airing the quartz sand to remove impurities in the quartz sand; screening quartz sand with a proper particle size by using a screen; then, mixing the quartz sand according to the experiment requirement proportion, preparing an oil sample, and placing the oil sample in a thermostat to be heated to 80 ℃ so as to facilitate the thick oil to be injected into the SAGD experiment model. Preparing distilled water of sufficient quality; 4000g of distilled water and 20g of NaCl were weighed and stirred in a clean beaker to prepare 0.5% brine.
(2) Firstly, connecting all devices by pipelines, injecting pipelines to wrap heat insulation materials, and winding extraction pipelines by a heat tracing system;
checking whether the display of the temperature sensor and the pressure sensor is accurate, assembling the model, uniformly filling gravel into the model from four sand filling openings at the upper part, stirring and compacting by using a specially-made flexible stirring rod, sealing the sand filling openings, and recording the mass m of the sand filled at this timesa. Laying the model flat, checking each temperature sensor and pressure sensorAnd (5) if the device is accurate, inserting the horizontal well screen pipe and the horizontal well. And covering a sealing cover plate, filling a flexible graphite packing between the sealing cover plate and the model, covering a rigid gasket on the flexible graphite packing, and compacting by using a rubber hammer. And covering a pressure-bearing sealing cover on the sealing cover plate, screwing a pressure-bearing nut on the outermost side of the pressure-bearing sealing cover, and then pressing the rigid gasket by screwing a screw on the inner side of the pressure-bearing sealing cover and compacting the flexible graphite sealing ring to seal the model.
Specifically, the horizontal well pipe column structure selected in the embodiment is a multi-steam-injection-point steam injection pipe column.
(3) And (3) injecting gas into the model by using a nitrogen bottle, pressurizing the model to 3-4 MPa, observing whether a pressure gauge has obvious change, gradually increasing the pressure of the model if the pressure gauge has no obvious change, and finally keeping the pressure in the model at 10MPa, observing whether the pressure in the model has change after 12h, wherein the gas tightness of the model is good if the pressure in the model has no change.
(4) Connecting a vacuum pump to a fluid injection port of the sand filling model, simultaneously adding the pressure of a back pressure valve to the SAGD preset pressure, vacuumizing the sand filling by using the vacuum pump, wherein the vacuumizing time lasts for 8 hours in order to achieve higher vacuum degree, the reading of a vacuum gauge is observed during the vacuumizing, after the pressure of the vacuum gauge is stabilized to be about-0.10 MPa, closing the vacuum pump, and closing the fluid injection port.
(5) And connecting the middle container with a fluid injection port, opening a pipeline valve, taking the prepared 0.5% NaCl solution as simulated formation water, and injecting the simulated formation water into the model through a high-precision constant-pressure constant-speed pump, wherein the injection port is a fluid injection port at the lower part of the model. The total volume of liquid pumped was recorded and the porosity of the model was calculated from the model volume. Opening the valve of the collecting pipeline after the saturated water is saturated, recording the pressure difference under different injection rates, and obtaining the pressure difference according to the Darcy formula
And calculating the permeability K of the model. Wherein the injection speed in the step (5) is respectively 10mL/min, 20mL/min and 30 mL/min.
(6) Opening a heating switch of the constant temperature box, and setting the temperature of the constant temperature box to be 80 ℃; opening crude oil vessel heat tracing system, intermediate vessel and crude oil thereinHeating to 80 ℃, connecting the crude oil container to a sand filling model after the temperature of the whole model is up to 80 ℃ and the crude oil container is heated to 80 ℃, saturating the original map oil heated to 80 ℃ into the sand filling model by a high-precision constant-pressure constant-speed pump, displacing water in pores, and according to the volume V of the injected crude oiloCalculating the oil saturation SoAnd irreducible water saturation Sw. The mold was then cooled to 10 ℃;
Sw＝1-S0
the density of the selected crude oil is less than that of the formation water, so that saturated oil is selected from a fluid injection port at the upper part of the model. The crude oil was saturated into the model at a constant pressure of 10 MPa.
(7) Injecting steam: and heating and pressurizing distilled water to an experimental design saturated steam state, injecting the distilled water into a sand filling model at a certain flow rate, and starting the SAGD process.
(8) Opening a data acquisition system, and recording the change conditions of a pressure field and a temperature field in the sand filling model in the experimental process so as to judge the growth condition of a steam cavity in the SAGD process; and collecting the oil-water emulsion produced in each time period.
(9) Weighing the produced oil-water emulsion in several times to obtain the instantaneous liquid production amount in unit time, setting the temperature of a constant temperature box to be 100 ℃, then putting the oil-water emulsion into the constant temperature box for drying, weighing the dried oil-water emulsion again to obtain the instantaneous oil production amount in unit time, and finally processing the experimental result to obtain the accumulated oil production rate, the accumulated oil production amount and the recovery ratio.
(10) Treating residual oil: after production is finished, firstly, pressure relief and temperature reduction treatment are carried out. And opening the sand filling model, observing the development condition of the steam cavity, taking a picture, and introducing the residual oil distribution map into professional software for image processing to obtain a residual saturation map. Partitioning the sand-filled model into blocks, collecting samples in different blocks, taking 5g of sample in each block, adding 50ml of petroleum ether, and using a glass rodStirring continuously to make the rest oil fully contact with solvent, separating quartz sand from filtrate, wrapping quartz sand, placing into a reflux device, heating and refluxing with petroleum ether for 60min to remove crude oil attached to the surface of quartz sand, oven drying, and weighing to obtain quartz sand mass msa. Collecting filtrate and reflux, distilling to remove petroleum ether in a distillation device, drying, and weighing to obtain crude oil mass mo。
Remaining oil saturation calculation:
Claims (9)
1. an experimental device for simulating steam injection of an SAGD horizontal well comprises an experimental steam injection system, an experimental fluid injection system, an SAGD experimental model connected with the experimental fluid injection system, a produced liquid cooling and collecting system and a data processing system; the device is characterized by also comprising a horizontal well model which is respectively connected with the experimental steam injection system and the produced liquid cooling and collecting system; the horizontal well model is a detachable SAGD injection well; the steam injection well and the production well are horizontally inserted into the SAGD experimental model and are sealed with the SAGD experimental model through a graphite sealing ring; the tubular column structure of steam injection well and production well is as follows:
(1) the steam injection well and the production well are both of parallel double-pipe structures, the pipe column structures are the same, two oil pipes in the steam injection well and two oil pipes in the production well are both positioned at the heel end of the SAGD experiment model, the length of the horizontal section is 0cm, and four oil pipes are all provided with holes at the tail ends; steam is injected from the heel end of the SAGD experimental model in the formal production stage; the pipe column structure of the steam injection well and the production well is suitable for the conventional steam injection mode;
(2) the steam injection well and the production well are both of a parallel double-pipe structure, two oil pipes in the steam injection well are a short pipe and a long pipe, the short pipe is positioned at the heel end of the SAGD experimental model, and the length of the horizontal section is 0 cm; the long pipe extends to the toe end of the SAGD experimental model; two oil pipes in the production well are both positioned at the heel end of the SAGD experimental model, and the lengths of the horizontal sections are both 0 cm; the four oil pipes are all provided with holes at the tail ends; steam is injected from the heel end and the toe end of the SAGD experimental model at the same time in the formal production stage; the pipe column structure of the steam injection well and the production well is suitable for a double-pipe steam injection mode;
(3) the steam injection well and the production well are both of a parallel double-pipe structure, two oil pipes in the steam injection well are a short pipe and a long pipe, the short pipe is positioned at the heel end of the SAGD experimental model, and the length of the horizontal section is 0 cm; the long pipe extends to the toe end of the SAGD experimental model; the tail end of the short pipe is provided with a hole, and the tail end of the long pipe is closed; steam injection points are uniformly distributed on the long pipe, and the aperture of each steam injection point is gradually increased from the heel end to the toe end of the SAGD experimental model; two oil pipes in the production well are both positioned at the heel end of the SAGD experimental model, and the tail end of the SAGD experimental model is provided with a hole; steam is injected along steam injection points uniformly distributed on a long pipe of the steam injection well in the formal production stage; the pipe column structure of the steam injection well and the production well is suitable for a multi-point steam injection mode;
and slotted screen pipes are sleeved outside the oil pipes to prevent sand.
2. The experimental facility for simulating steam injection of a SAGD horizontal well in accordance with claim 1, wherein the steam injection well and the production well have a tubular column structure (3) with a diameter of 1.5mm at the steam injection point at the heel end, 2mm at the steam injection point at the middle section and 3mm at the steam injection point at the toe end.
3. The experimental facility for simulating SAGD horizontal well steam injection of claim 1, wherein the experimental steam injection system comprises a high precision constant pressure constant speed pump and steam generator; the high-precision constant-pressure constant-speed pump is connected with a water inlet of the steam generator through a water injection pipeline, a steam inlet pipeline and an emptying pipeline are connected in parallel at a steam exhaust end of the steam generator, and the steam inlet pipeline is connected with the horizontal well model; the steam generator is provided with a pressure gauge.
4. The experimental facility for simulating SAGD horizontal well steam injection according to claim 1, wherein said experimental fluid injection system comprises at least constant pressure constant speed pump, simulated formation water container, crude oil container and pipeline heat tracing system; the simulated formation water container and the crude oil container are connected with the constant-pressure constant-speed pump in a parallel connection mode, the output end of the simulated formation water container is connected with the lower fluid injection port of the SAGD experiment model through a water inlet pipeline, and the output end of the crude oil container is connected with the upper or lower fluid injection port of the SAGD experiment model through an oil inlet pipeline of the winding heat tracing system.
5. The experimental facility for simulating SAGD horizontal well steam injection according to claim 1, wherein the SAGD experimental model comprises at least a temperature sensor and a pressure sensor; a detachable SAGD injection and production well reserved hole is formed in the SAGD experiment model; fluid injection ports are uniformly formed in the upper part and the lower part of the SAGD experimental model and are connected with an experimental fluid injection system; and sand filling openings are distributed at the upper part of the SAGD experimental model.
6. The experimental device for simulating SAGD horizontal well steam injection according to claim 5, wherein a rotatable base is arranged at the bottom of the SAGD experimental model and connected with a hand crank through a gear box; a heat insulation layer is arranged inside the SAGD experiment model, a guide rail type constant temperature box is arranged outside the SAGD experiment model, a temperature sensor and a pressure sensor are integrated on the constant temperature box, and the temperature of the constant temperature box is 10-200 ℃; preferably, the oven temperature is set to 80 ℃.
7. The experimental facility for simulating SAGD horizontal well steam injection according to claim 1, wherein the production liquid cooling and collection system comprises a production pipeline wound with a heat tracing system, a sand filter, a condenser and a back pressure valve; the condenser consists of a water bath circulating condensation pipe and a water bath circulating device, and the temperature of the water bath circulating device is 10-100 ℃; the back pressure valve is connected with the hand pump, and the hand pump is used for controlling the output pressure of the back pressure valve; the mesh number of the sand filter is 200 meshes; the temperature of the water bath circulating device is 80 ℃.
8. The experimental facility for simulating SAGD horizontal well steam injection of claim 1, wherein the data processing system comprises a data acquisition module and a computer.
9. The application method of the simulated SAGD horizontal well steam injection experimental device as claimed in claim 1, is characterized by comprising the following steps:
(1) mixing according to a required proportion to prepare quartz sand, heating an oil sample in a constant temperature box, preparing distilled water, and preparing a NaCl solution with the concentration of 0.5%;
(2) the pipeline connects all the devices, the injection pipeline wraps the heat insulation material, and the extraction pipeline is wound by a heating belt; checking whether the temperature and pressure sensors display accurately, assembling the model, filling the mixed quartz sand into the inner cavity of the model through four sand filling ports at the top of the SAGD experimental model, compacting, sealing a sand filling port plug, and detecting the air tightness of the model by using nitrogen;
(3) vacuumizing the sand filling by using a vacuumizing pump, and closing a fluid injection port; connecting a crude oil container with a fluid injection port, opening a pipeline valve, and pumping the prepared 0.5% NaCl solution into an SAGD experimental model; recording the total volume of the pumped liquid and calculating the porosity of the model according to the volume of the model; opening a valve of the collecting pipeline after water is saturated, recording the pressure difference under different injection rates, and calculating the permeability of the model according to a Darcy formula;
(4) adding back pressure to PrOpening a heating switch of the constant temperature box, setting the temperature of the constant temperature box to be 80 ℃, and continuously injecting a NaCl solution into the sand filling model to pressurize to P after the temperature of the whole SAGD experimental model is heated to 80 DEG Cr；
(5) Heating a crude oil container and crude oil therein to 80 ℃, connecting a piston container to a fluid injection port at the upper part of a sand filling model, saturating thick oil into the sand filling model through a pump, displacing water in pores, and calculating the oil saturation and the irreducible water saturation according to the volume of the injected crude oil;
(6) heating and pressurizing distilled water to an experimental design saturated steam state, injecting the distilled water into a sand filling model at a certain flow rate, and starting an SAGD process;
(7) opening a data acquisition system, and recording the change conditions of a pressure field and a temperature field in the sand filling model in the experimental process so as to judge the growth condition of a steam cavity in the SAGD process; collecting the oil-water emulsion produced in each time period;
(8) weighing the produced oil-water emulsion in several times to obtain the instantaneous liquid production amount in unit time, setting the temperature of a constant temperature box to be 100 ℃, then putting the oil-water emulsion into the constant temperature box for drying, weighing the dried oil-water emulsion again to obtain the instantaneous oil production amount in unit time, and finally processing the experimental result to obtain the accumulated oil production rate, the accumulated oil production amount and the recovery ratio;
(9) after production, firstly, pressure relief and temperature reduction treatment are carried out; and opening the sand filling model, observing the development condition of the steam cavity and taking a picture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110507552.1A CN113818853A (en) | 2021-05-10 | 2021-05-10 | Experimental device for simulating steam injection of SAGD horizontal well and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110507552.1A CN113818853A (en) | 2021-05-10 | 2021-05-10 | Experimental device for simulating steam injection of SAGD horizontal well and application method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113818853A true CN113818853A (en) | 2021-12-21 |
Family
ID=78923738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110507552.1A Pending CN113818853A (en) | 2021-05-10 | 2021-05-10 | Experimental device for simulating steam injection of SAGD horizontal well and application method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113818853A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115324546A (en) * | 2022-08-28 | 2022-11-11 | 重庆科技学院 | SAGD steam preheating effect prediction method, simulation experiment device and simulation method thereof |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2744193A1 (en) * | 2008-11-28 | 2010-06-03 | Schlumberger Canada Limited | Method for estimation of sagd process characteristics |
| CN101818636A (en) * | 2010-05-24 | 2010-09-01 | 中国石油天然气股份有限公司 | Three-dimensional simulation test device for oil extraction by injecting multielement hot fluid |
| CN104500012A (en) * | 2014-11-24 | 2015-04-08 | 中国石油天然气股份有限公司 | SAGD starting method for interlayer heterogeneous thickened oil pool |
| CN104948153A (en) * | 2015-04-29 | 2015-09-30 | 中国石油天然气股份有限公司 | Solvent-assisted SAGD three-dimensional physical simulation experiment method and device |
| CN106869886A (en) * | 2017-02-03 | 2017-06-20 | 中国石油天然气股份有限公司 | The oil production method of pre- air injection |
| CN107420078A (en) * | 2017-09-06 | 2017-12-01 | 阳晓燕 | Rock stress sensitivity drives oil displacement efficiency to steam influences physical simulating method and device |
| CN108590611A (en) * | 2018-04-26 | 2018-09-28 | 中国石油大学(华东) | Superheated steam injection, which recovers the oil, simulates the forming apparatus and experimental method of oil reservoir vapor chamber |
| CN109598099A (en) * | 2019-01-23 | 2019-04-09 | 中国石油大学(华东) | A kind of two-tube SAGD long horizontal well even steam injection method for numerical simulation for considering oil reservoir and being coupled with pit shaft |
| CN111364961A (en) * | 2018-12-25 | 2020-07-03 | 中国石油天然气股份有限公司 | Super heavy oil SAGD exploitation method |
| CN112065347A (en) * | 2020-09-23 | 2020-12-11 | 中国海洋石油集团有限公司 | Device and method for thickened oil multi-well SAGD simulation |
| CN112065348A (en) * | 2020-09-23 | 2020-12-11 | 中国海洋石油集团有限公司 | Three-dimensional multi-interlayer oil sand SAGD simulation device and method |
| CN112324407A (en) * | 2020-11-19 | 2021-02-05 | 中国海洋石油集团有限公司 | Method and device for researching steam cavity expansion boundary in SAGD development process |
-
2021
- 2021-05-10 CN CN202110507552.1A patent/CN113818853A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2744193A1 (en) * | 2008-11-28 | 2010-06-03 | Schlumberger Canada Limited | Method for estimation of sagd process characteristics |
| CN101818636A (en) * | 2010-05-24 | 2010-09-01 | 中国石油天然气股份有限公司 | Three-dimensional simulation test device for oil extraction by injecting multielement hot fluid |
| CN104500012A (en) * | 2014-11-24 | 2015-04-08 | 中国石油天然气股份有限公司 | SAGD starting method for interlayer heterogeneous thickened oil pool |
| CN104948153A (en) * | 2015-04-29 | 2015-09-30 | 中国石油天然气股份有限公司 | Solvent-assisted SAGD three-dimensional physical simulation experiment method and device |
| CN106869886A (en) * | 2017-02-03 | 2017-06-20 | 中国石油天然气股份有限公司 | The oil production method of pre- air injection |
| CN107420078A (en) * | 2017-09-06 | 2017-12-01 | 阳晓燕 | Rock stress sensitivity drives oil displacement efficiency to steam influences physical simulating method and device |
| CN108590611A (en) * | 2018-04-26 | 2018-09-28 | 中国石油大学(华东) | Superheated steam injection, which recovers the oil, simulates the forming apparatus and experimental method of oil reservoir vapor chamber |
| CN111364961A (en) * | 2018-12-25 | 2020-07-03 | 中国石油天然气股份有限公司 | Super heavy oil SAGD exploitation method |
| CN109598099A (en) * | 2019-01-23 | 2019-04-09 | 中国石油大学(华东) | A kind of two-tube SAGD long horizontal well even steam injection method for numerical simulation for considering oil reservoir and being coupled with pit shaft |
| CN112065347A (en) * | 2020-09-23 | 2020-12-11 | 中国海洋石油集团有限公司 | Device and method for thickened oil multi-well SAGD simulation |
| CN112065348A (en) * | 2020-09-23 | 2020-12-11 | 中国海洋石油集团有限公司 | Three-dimensional multi-interlayer oil sand SAGD simulation device and method |
| CN112324407A (en) * | 2020-11-19 | 2021-02-05 | 中国海洋石油集团有限公司 | Method and device for researching steam cavity expansion boundary in SAGD development process |
Non-Patent Citations (3)
| Title |
|---|
| 李秀峦;刘昊;罗健;江航;王红庄;: "非均质油藏双水平井SAGD三维物理模拟" * |
| 翟成龙: "SAGD多点注汽长水平井沿程蒸汽分布研究" * |
| 马德胜;郭嘉;昝成;王红庄;李秀峦;史琳;: "蒸汽辅助重力泄油改善汽腔发育均匀性物理模拟" * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115324546A (en) * | 2022-08-28 | 2022-11-11 | 重庆科技学院 | SAGD steam preheating effect prediction method, simulation experiment device and simulation method thereof |
| CN115324546B (en) * | 2022-08-28 | 2023-09-08 | 重庆科技学院 | SAGD steam preheating achievement prediction method, simulation experiment device and simulation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110907334B (en) | Device and method for measuring radial flow oil-water relative permeability of conglomerate full-diameter core | |
| CN208206964U (en) | Simulate high-pressure slip-casting device under buried stratum river channels | |
| CN102608011B (en) | Method for determining and building bound water for crack-pore (hole) type reservoir core | |
| CN105114062A (en) | Testing device for simulating permeability rule of low-permeability horizontal well and testing method | |
| CN105178927B (en) | A kind of displacement simulation experimental provision and system | |
| CN108287123B (en) | CO under dynamic filtration2Fracturing fluid sand-carrying visual testing device and method | |
| CN112282705B (en) | Evaluation device and experimental method for phase stability of drilling fluid additive to natural gas hydrate | |
| CN110455686B (en) | Undercurrent exchange simulation measurement method under different groundwater supply conditions | |
| CN113109546A (en) | Experimental device and method for predicting drying salt deposition range of reservoir of underground gas storage | |
| CN103940715A (en) | Simulating experiment method of rock natural seepage ability | |
| CN113818853A (en) | Experimental device for simulating steam injection of SAGD horizontal well and application method thereof | |
| CN115653554A (en) | Micro-experiment method for removing retrograde condensation injury through gas injection based on micro-fluidic control | |
| CN108956425B (en) | Device and method for measuring initial water permeability of extra-heavy oil reservoir | |
| CN110608978A (en) | Fine particle migration tracer test device in simulation aquifer water pumping and injecting process | |
| CN104712295A (en) | Visual horizontal well oil deposit sand filling physical model and system | |
| CN113936537B (en) | Hydrocarbon generation dynamics simulation experiment device and method | |
| CN108060918A (en) | The device and method that evaluation initial water mobility influences heavy crude reservoir exploitation effect | |
| CN110905496B (en) | Gas drive overlap simulation device and use method thereof | |
| CN209780859U (en) | Low-permeability conglomerate oil reservoir fracturing horizontal well productivity simulation model | |
| CN105259330B (en) | A kind of indoor experimental apparatus and use the method that this device carries out profile control | |
| CN116856922A (en) | Experimental device and method for distribution form of dominant channels among steam flooding wells of heavy oil reservoirs | |
| CN113944462B (en) | Weak bond hydrate layer curing transformation simulation experiment system and method | |
| CN110952964A (en) | Horizontal well water injection profile control model experimental device | |
| CN115949377A (en) | Underground stratum multifunctional sand prevention performance evaluation system and method | |
| CN204163714U (en) | A kind of hypotonic staged fracturing of horizontal well Coupled Flow experimental facilities |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |