CN111024584A - Acid rock reaction double-rock-plate fracture-cave simulation device and working method thereof - Google Patents
Acid rock reaction double-rock-plate fracture-cave simulation device and working method thereof Download PDFInfo
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Abstract
An acid rock reaction double-rock-plate fracture-cave simulation device and a working method thereof. The acid rock reaction double-rock plate fracture-cave simulation device comprises a pressure supply injection system, a pretreatment information acquisition system, a double-rock plate fracture-cave model CT imaging system, an outlet information acquisition system, a condensation back-pressure system, a waste liquid recovery system and a data processing system; the systems are communicated in sequence by the connecting device. The device compact structure has stronger bearing capacity, can realize simulating the fracture acidizing, the acid fracturing condition of stratum inclination 0 ~ 90 through rotary device, can realize that the three-dimensional state of dynamic observation acidizing wormhole extends, competes, communicates between the fracture and the hole and the dynamic observation of three-dimensional fracture acid etching process in the process of punching and the acid fracturing experiment.
Description
Technical Field
The invention relates to an acid rock reaction double-rock plate fracture-cave simulation device and a working method thereof, and belongs to the technical field of yield increasing measures of oil and gas reservoirs.
Background
Acidification is taken as a main technical measure for developing a low-porosity and low-permeability carbonate reservoir at present, can effectively remove pollution and blockage of a reservoir near a shaft, improve the connectivity between the shaft and the reservoir and recover or improve the oil gas yield. During acidification, the acid etching result can be divided into surface etching, earthworm hole and uniform etching according to the etching form, and the two conditions of the surface etching and the uniform etching consume more acid liquor and have poor flow guide capability; the earthworm hole is a corrosion channel with high flow conductivity, and the formed earthworm hole consumes less acid liquor and has good transformation effect. The wormholes are the main form for the development of the communicated pore passages among the wormholes, the acid etching time and the acid liquor consumption can have important influence on the development of the pore passages, and the communication among the wormholes and the development of the pore passages can change along with the change of the acid etching time and the acid liquor consumption. The communication state between the slits and the acid liquor perforation process are the basis of quantitative test and analysis which are the fine design of the acidification acid pressing process, so that the growth rate of the pore passages between the slits and the acid liquor consumption are calculated, the expansion process and the competition condition of the three-dimensional wormholes between the slits and the holes are described, and the method has important significance for improving the acidification construction effect.
At present, the research on earthworm foramen at home and abroad is mainly based on empirical or semi-empirical mode, a series of models are established to describe the distribution of the earthworm foramen, the evaluation on the earthworm foramen is mainly realized by a series of dimensionless numbers, such as Dada, Peclet and the like, and the description on the growth rate of the earthworm foramen mainly refers to a processing method of Buijse for the advancing speed of the front edge of the earthworm foramen; and the physical model experiment is mainly based on a rock core displacement experiment, and the optimal injection speed is found by calculating the breakthrough volume. Meanwhile, the development process of the wormholes in the stratum is mainly observed through a visual single rock plate model experiment, and the experiment method has certain limitations: (1) the opening of the visible window body is small, and the visible degree of the whole acid liquid expansion stage and the earthworm foramen development process is not high. (2) The pressure bearing capacity is insufficient, the sealing performance is poor due to the existence of the visual module, and acid liquor possibly leaks to splash at the interface of the visual window and the pipeline after the pressure is increased, so that the experiment fails and the safety is easily threatened; (3) the simulation for acid erosion is sufficient but the simulation for fractures is insufficient, and the simulated formation conditions are relatively few because the distance between the rock plates is not adjustable. (4) The visualization of the single rock plate is a crack simulation device based on a two-dimensional wormhole expansion process, the description is only the expansion on a plane, and the description accuracy of the development of the pore is not enough; (5) the method for simulating the formation temperature is to heat the whole device space, and brings inconvenience to the operation and inspection in the middle of the experiment.
Chinese patent CN201611046285.8 discloses a visual crack-type rock acid etching experimental device and an experimental method, including an acid injection system, a visual experimental system, a pressure supply system for a visual cavity, and a waste liquid collection system. The device carries out the acid corrosion of the simulation seam and the evaluation of the fracture diversion after the acid corrosion from the angle of the simulation seam with small scale, and carries out the shearing simulation and the rheological property test of the spiral coil pipe on the fracturing fluid and the acid liquid. And simulating various main influence factors of the acid-etched fracture flow conductivity through an indoor simulation experiment of the acid-etched fracture flow conductivity evaluation device.
At present, the simulation and observation of the acidification construction in China mainly adopt two modes, one mode is the measurement of the flow conductivity of a displacement device, the mode can only carry out the acidification simulation on a smaller size, certain errors can be generated in experimental data due to the influence of rock heterogeneity, and meanwhile, the whole experimental process can only carry out regular derivation but cannot carry out process observation because the experimental process is completely in a closed environment; the other is real-time monitoring of the acidification and etching process through a visual single rock plate, the mode can only observe the inter-slot and the expansion of the earthworm hole in two dimensions, the observation condition is lacked in the three-dimensional growth process of the earthworm hole, the simulation capability of acidification and fracturing is insufficient due to the visualization based on the single plate, the simulation condition is lacked in the etching process of the three-dimensional fracture, and meanwhile, the sealing performance and the pressure bearing capacity of the device are insufficient due to the excessive number of combined parts and the material problem of the visual cavity. The invention carries out the simulation of acid etching and acid fracturing of the fracture and the simulation of the acid corrosion and the acid fracturing of the fracture and the simulation of the shear of the spiral coil pipe and the test of the rheological property of the fracturing fluid and the acid liquor from the angle of simulating the fracture and the fracture in a small scale. Through the slot-hole communication and earthworm hole three-dimensional expansion indoor simulation experiment, various main influence factors such as acid erosion slot-hole communication condition and earthworm hole three-dimensional growth condition can be simulated, optimal process parameters can be found, and meanwhile, simulation research can be carried out on various new process measures such as improvement of slot-hole communication, effective growth guidance of three-dimensional earthworm holes and the like on the device.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an acid rock reaction double-rock plate slot hole simulation device and a working method of the device.
An acid rock reaction double-rock plate fracture-cave simulation device comprises a pressure supply injection system, a pretreatment information acquisition system, a double-rock plate fracture-cave model CT imaging system, an outlet information acquisition system, a condensation back-pressure system, a waste liquid recovery system and a data processing system; the systems are sequentially communicated through a connecting device;
the pressure supply injection system provides injection pressure for the double-rock-slab fracture-cave simulation device and adjusts the amount and speed of injected acid liquid; the pretreatment information detection system is used for adjusting the pressure and the temperature of acid liquor and collecting the pressure, the temperature and the flow information of fluid at the inlet end of the double-rock-slab fracture-cave model CT imaging system; the double-rock-plate fracture-cave model CT imaging system is used for dynamically observing the acid liquid flowing between the double rock plates and the communication and hole-penetrating process of the fracture-cave under the action of the acid liquid through a CT imaging technology; the outlet information acquisition system is used for acquiring pressure, temperature and flow information of fluid at the outlet end of the double-rock-slab slit-cave model CT imaging system; the condensation back pressure system is used for cooling the high-temperature fluid at the outlet end of the double-rock-slab slot model, and controlling the back pressure at the outlet end to be stable under the experimental requirement; the waste liquid recovery system is used for recovering waste liquid; the data processing system is used for sorting and calculating the acquired experimental data of the inlet end and the outlet end.
According to the optimization of the invention, the double-rock plate slot hole model CT imaging system comprises a rock plate fixing and clamping device, a CT scanning device and a rotating device, wherein the rock plate corrosion clamp is arranged on a bracket and is placed in the CT scanning device; the CT scanning device is used for observing the processes of wormhole extension, competition, communication between wormholes and hole penetration in a three-dimensional state in a double-rock plate acidification experiment and dynamically observing the acid etching process of a three-dimensional crack in an acid fracturing experiment.
According to the optimization of the invention, the rock plate corrosion clamp comprises a box body and thick pipe interfaces, wherein the thick pipe interfaces communicated with the box body are arranged on two side surfaces of the box body, and a CT (computed tomography) cavity, a rock plate fixing and clamping device and a liquid injection pipeline are arranged in the box body; the rock plate fixing and clamping device is placed in the CT cavity; the liquid injection pipeline is connected with the rock plate fixing and clamping device;
the fixed clamping device of rock plate has certain space, including two rock plates, rubber tray, the liquid chamber after the device main part, hydrophilic adhesive are glued, the device both sides are equipped with the liquid chamber, be equipped with in the middle of the liquid chamber the rubber tray, it is fixed on the rubber tray two rock plates, clamping device places in the CT cavity, the external computer of CT cavity can directly present CT scanning result for three-dimensional state down earthworm hole extends, competition, the communication and the process of punching between the fracture and cave during dynamic observation acidizing, three-dimensional fracture acid etching process during acid pressing. High-temperature liquid required by the experiment is pumped into the device space through the liquid cavity communicated liquid injection pipeline, and confining pressure is added to the device space.
A clamping groove is formed in the rock plate clamping device, the distance between the rock plates can be adjusted through the clamping groove, the rock plate fixing and clamping device is provided with a rotating device, the rotating device comprises two rotating shafts, one end of each rotating shaft is connected with the box body, the other end of each rotating shaft is embedded into the rock plate fixing and clamping device through a key groove, and rotating shaft clamping grooves are formed in the periphery of the device; the rotation of the rotating shaft drives the rock plate fixing and clamping device to rotate forward or laterally by 0-90 degrees.
According to the invention, the length, width and height of the liquid tank are respectively 500mm, 400mm and 50-100 mm; the value ranges of the length, the width and the height of the rock plate are respectively 200-300mm, 50-200mm and 5-15 mm.
Further preferably, the length, width and height of the liquid tank are respectively 400mm, 200mm and 100 mm; the length, width and height of the rock plate are respectively 200mm, 100mm and 10 mm.
According to the invention, preferably, the pressure supply injection system is communicated with an intermediate container through a thick pipeline, injected liquid is firstly stored in the intermediate container, the intermediate container can preserve heat of the liquid, the intermediate container is communicated with a rock plate fixing and clamping device through a liquid injection pipeline, and a liquid cavity with heat insulation materials in the clamping device is injected into a double rock plate slot model space to provide acid liquid with temperature and pressure required by experiments for the rock plate in the space; annotate liquid pipe connection the pipeline interface, thick pipeline internal diameter is 4mm, and the external diameter is 40mm, two rock plates slot model space is equipped with gas blow-off valve for the adjustment pressure is the experiment demand.
According to the invention, the pressure supply injection system comprises an intermediate container and an acid-proof booster pump, wherein the acid-proof booster pump is connected with the intermediate container through a pipeline and can be used for pumping acid liquid out of the intermediate container by the booster pump.
The preheating system comprises a preheating sleeve and a temperature sensor, the preheating sleeve comprises a heating sleeve and a heat-insulating sleeve sleeved on the heating sleeve, and the intermediate container is connected with the temperature sensor; the acid-proof booster pump is communicated with the intermediate container.
The inlet detection system comprises an inlet flowmeter, an inlet pressure sensor and an inlet temperature sensor, the intermediate container is communicated with the inlet flowmeter, the inlet flowmeter is communicated with the inlet end of the double-rock-slab slotted-hole model space through a valve, and the inlet pressure sensor and the inlet temperature detector are connected with the inlet end of the double-rock-slab slotted-hole model space.
The outlet detection system comprises an outlet flowmeter, an outlet pressure sensor and an outlet temperature sensor, the outlet end of the double-rock plate slot hole model space is connected with the outlet pressure sensor and the outlet temperature detector, and the outlet flowmeter is communicated with the outlet end of the gas-liquid separator through a valve.
The back pressure system comprises a back pressure valve, a back pressure container, a back pressure meter and a back pressure pump, and the outlet end of the double-rock-slab seam hole model space is communicated with the back pressure container, the back pressure pump and the back pressure meter through the back pressure valve respectively.
The waste liquid recovery system comprises a gas-liquid separator, a waste liquid tank and a condenser; the back pressure valve, the gas-liquid separator, the outlet flowmeter, the condenser and the waste liquid tank are sequentially communicated, and the gas-liquid separator is communicated with the outlet flowmeter through a valve.
The data processing system comprises acquisition control processing software, an industrial personal computer, a printer and a control cabinet. The acquisition control processing software runs under the environment of Win7 or Win10 and adopts VB programming.
The working method of the acid rock reaction double-rock-plate fracture-cave simulation device comprises the following specific steps:
(1) selecting stratum rocks, processing the stratum rocks into rock boards, when simulating acidification, carving a slot on both rock boards, stacking two carving surfaces oppositely into a double-rock-board slot model space in a rock-board corrosion clamp holder, cementing the two carving surfaces by using a hydrophilic cementing agent without leaving a gap, when simulating acid pressing, stacking the two carving surfaces oppositely, adjusting the space between the rock boards by using an internal clamping groove and the clamp holder, and opening the data processing system to perform pretreatment of experimental data after the rock boards are loaded into the double-rock-board slot model space according to experimental requirements;
(2) opening a gas vent valve, adjusting the pressure balance in the acid rock reaction double-rock-plate slot hole simulation device, and closing the gas vent valve;
(3) preparing acid liquor with the mass concentration of 0-37%, and injecting the acid liquor into an intermediate container; opening the preheating sleeve, and adjusting the temperature to be 20-120 ℃; opening the back pressure system, and setting a back pressure of 0-8 MPa; opening an inlet flow meter, an inlet pressure sensor, an inlet temperature sensor, an outlet flow meter, an outlet pressure sensor, an outlet temperature detector, a condenser, a CT scanning device and a communicated computer processing device;
(4) setting the injection speed to be 0-2L/h, opening the acid-resistant pump, and pumping the acid liquor in the intermediate container into the double-rock-slab seam hole model space through the acid-resistant pump;
(5) the inlet flowmeter, the inlet pressure sensor and the inlet temperature detector are used for acquiring the flow, pressure and temperature of fluid at the inlet end of the double-rock plate slot hole model in real time, the outlet flowmeter, the outlet pressure sensor and the outlet temperature detector are used for acquiring the flow, pressure and temperature of fluid at the outlet end of the double-rock plate slot hole model in real time, and the double-rock plate slot hole model CT imaging system is used for acquiring picture information of earthworm hole extension, competition, communication between slots and holes and a hole penetrating process in a three-dimensional state during simulation acidification in real time; during acid fracturing, picture information of a dynamic process of three-dimensional acid fracturing crack etching;
(6) and (4) transmitting the data and the picture information acquired in the step (5) to a data processing system to obtain real-time data of the earthworm foramen growth rate and the rock plate permeability change, and analyzing the three-dimensional earthworm foramen competition condition, the communication and the perforation process among the wormholes, the dynamic acid corrosion degree of the three-dimensional cracks and the acid corrosion process.
The invention has the beneficial effects that:
1. the rock plates are double rock plates, are small in scale and convenient to disassemble and assemble. The experimental device is optimally designed, the pressure bearing capacity of the instrument space is increased, and meanwhile, the corrosion of acid to the instrument is better solved by changing the key parts into high polymer materials.
2. Fills the blank of the technical means that the flat plate device performs acid rock reaction on the double rock plates and is combined with the CT device.
3. The three-dimensional fracture acidizing and fracturing conditions of different stratum inclination angles (0-90 degrees) can be simulated through the rotating device.
4. The adjustment of the middle gap of the rock plate can be realized through the clamping grooves in the space of the double-rock-plate fracture-cave model, so that different fractures of the stratum can be simulated.
5. Can realize dual-purpose simulation of acid fracturing and acid fracturing, can simulate the development of earthworm holes and the communication of fracture holes during acidification, and can also simulate the dynamic process of three-dimensional acid fracturing fracture etching during acid fracturing.
6. Extension and competition of wormholes in a three-dimensional state during acidification, communication among cracks and holes and dynamic observation of a hole penetrating process can be realized through a CT device; and during acid fracturing, monitoring the dynamic process of the three-dimensional acid fracturing crack etching in real time.
Drawings
FIG. 1 is a block diagram of the structure of the acid rock reaction double-rock plate slot hole simulation device;
FIG. 2 is a schematic view of the construction of the systems of the operation room of the present invention;
FIG. 3 is a front view of the rock plate corrosion holder of the present invention;
FIG. 4 is a top view of the rock plate corrosion holder of the present invention;
FIG. 5 is a schematic diagram of a fluid chamber configuration of the present invention;
FIG. 6 is a front view of the clamp of the present invention;
FIG. 7 is a side view of the holder of the present invention;
wherein: 1. the device comprises an intermediate container, 2, an acid-proof booster pump, 3, an inlet temperature sensor, 4, an inlet flowmeter, 5, an inlet pressure sensor, 6, a double-rock plate slotted hole model, 7, a blow-down valve 8, a CT device, 9, an outlet temperature sensor, 10, an outlet pressure sensor, 11, a back-pressure valve, 12, a back-pressure container, 13, a back-pressure meter, 14, a back-pressure pump, 15, a gas-liquid separator, 16, a vent valve, 17, an outlet flowmeter, 18, a condenser, 19, a waste liquid tank, 20, an operation chamber, 21, a thick line pipe interface, 22, a heating sleeve, 23, a liquid cavity, 24, a liquid injection pipeline, 25, a rotating shaft, 26, a key groove, 27, a clamping groove, 28, a clamp, 29, a fixing bolt, 30, a long groove opening, 31 and a.
Detailed Description
The invention is further defined in the following description, with reference to the figures and examples, but the scope of protection of the invention is not limited thereto.
Example 1
An acid rock reaction double-rock plate slot simulation device is shown in figure 1 and comprises an injection system, a preheating system, an inlet detection system, a double-rock plate slot model 6, an outlet detection system, a condenser 18, a back pressure system, a waste liquid recovery system and a data processing system; the injection system, the preheating system, the inlet detection system, the double-rock-slab slot-hole model 6, the outlet detection system, the back pressure system, the condenser 18 and the waste liquid recovery system are communicated in sequence;
the injection system provides injection power for the double-rock-slab fracture-cave simulation device and adjusts the speed of injecting acid liquor; the inlet detection system is used for acquiring the pressure, the temperature and the flow of fluid at the inlet end of the double-rock-slab slot-cave model 6; the preheating system preheats the acid liquor in the intermediate container to the temperature required by the experiment; the double-rock plate fracture-cave model 6 is used for dynamically observing the acid liquid flowing condition in the three-dimensional fracture and providing two different acid-rock reaction structures for simulating acidification and acid fracturing; the outlet detection system is used for acquiring the pressure, the temperature and the flow of fluid at the outlet end of the double-rock-slab slot-cave model 6; the condenser 18 condenses the high-temperature waste liquid to reduce the temperature; the back pressure system is used for controlling back pressure at the outlet end of the double-rock-slab slot model 6 and keeping the back pressure constant at an experimental requirement value; the waste liquid recovery system is used for recovering waste liquid; the data processing system is used for sorting and calculating the acquired experimental data of the inlet end and the outlet end of the double-rock-slab slot-cave model 6. The pipe valve system is used for connecting and controlling various systems and comprises an injection system, a preheating system, an inlet detection system, a double-rock plate slot hole model 6, an outlet detection system, a condenser 18, a back pressure system, a waste liquid recovery system and a data processing system.
The double-rock plate slot model comprises a rock plate corrosion clamp holder and a CT scanning device, wherein the rock plate corrosion clamp holder is arranged in a CT cavity. The method is used for observing the processes of wormhole extension, competition, communication between wormholes and hole penetration in a three-dimensional state in a double-rock plate experiment and dynamically observing the acid etching process of the three-dimensional cracks in an acid fracturing experiment.
The rock plate corrosion holder, as shown in fig. 3, 4 and 5, comprises a liquid cavity 23, a liquid injection pipeline 24, a rotating shaft 25, a key groove 26, a clamping groove 27 and a holder 28, wherein the liquid injection pipeline 24 communicated to the liquid cavity 23 is arranged on two side surfaces of the rock plate corrosion holder, the liquid cavity 23 is arranged in the rock plate corrosion holder, the clamping groove 27 is arranged in the liquid cavity 23, and the movable holder is arranged in the clamping groove 27;
the holder includes gim peg 29, longslot 30, grip block 28 and rock plate, and the cemented rock plate of hydrophilic cement is placed in the middle of grip block 28, utilizes gim peg 29 fixed, and the holder can remove in draw-in groove 27, can change the position of gim peg 29 simultaneously through longslot 30 with the distance between the control grip block 28, places two rock plates respectively on grip block 28 upper portion, can change the distance between two rock plates through the distance of adjustment gim peg 29.
The rock plate corrosion clamp holder is also provided with a rotating device, the rotating device comprises four rotating shafts 25, one end of each rotating shaft 25 is connected with an external support, and the other end of each rotating shaft 25 is embedded into the box body through a key groove 26; the rotating shaft 25 drives the box body to rotate 0-90 degrees.
The length, width and height of the box body are respectively 400mm, 200mm and 100 mm; the length, width and height of the rock plate are respectively 200mm, 100mm and 10 mm.
The inlet detection system is communicated with the liquid cavity 23 through a liquid injection pipeline so as to prevent the common pipeline from bending and deforming and being incapable of being in close contact with the rock plate; the liquid injection pipeline that is equipped with communicates the box inside to the liquid chamber, and the pipeline internal diameter is 4mm, and 6 upper portions of two rock plates slot hole models are equipped with gas atmospheric valve 7. The pressure balance in the acid rock reaction double-rock plate fracture-cave simulation device is adjusted. The surface of the liquid chamber 23 is coated with a heat insulating material. The rock plate is provided with confining pressure and the temperature required for the experiment by pumping high temperature liquid into the liquid chamber 23.
The injection system comprises an intermediate container 1 and an acid-proof pump 2, wherein the intermediate container 1 is communicated with the acid-proof pump 2 through a valve; the maximum flow of the acid-proof pump 2 is 2L/h, the maximum injection pressure is 10MPa, Hastelloy lining fluorine plastic is adopted, and the injection flow can be remotely adjusted through a frequency converter. The volume of the intermediate container 1 is 2L, and a plastic tank container is adopted.
The preheating system comprises a heating sleeve 1, a temperature sensor 3 and a heat insulation sleeve attached to the periphery of the intermediate container, and an outlet of the intermediate container is connected with the temperature sensor; the acid-proof pump 2 is communicated with the intermediate container 1; the temperature control precision of the heating jacket 1 is +/-0.5 ℃.
The inlet detection system comprises an inlet temperature sensor 3, an inlet flowmeter 4 and an inlet pressure sensor 5, the intermediate container 1 is communicated with the inlet flowmeter 4, the inlet flowmeter 4 is communicated with the inlet end of the double-rock-slab slot model 6 through a valve, and the inlet pressure sensor 5 and the inlet temperature sensor 3 are connected with the inlet end of the double-rock-slab slot model 6;
the outlet detection system comprises an outlet temperature sensor 9, an outlet pressure sensor 10 and an outlet flowmeter 17, and the outlet end of the double-rock plate slot hole model 6 is connected with the outlet temperature detector 9 and the outlet pressure sensor 10;
the measuring ranges of the inlet pressure sensor 5 and the outlet pressure sensor 10 are both 10MPa, the precision is 0.1% FS, and a pressure digital display secondary instrument is attached. The pressure digital display secondary instrument is four and half, is provided with an RS232 interface, and can be connected with a computer in a network.
The inlet flowmeter 4 and the outlet flowmeter 17 are all corrosion-resistant, acid-alkali-resistant and all-tetrafluoro flowmeters, the caliber of the pipeline is phi 10mm, the flow is 2L/h, the working pressure is 0-10 MPa, and the rise temperature is as follows: -10 ~ 180 °, accuracy is ± 0.5%, and the casing material is stainless steel, power supply: an internal power supply 3v, an external power supply 5 v-24 v and an output signal of 4-20 mA of a pulse signal.
The detection ranges of the inlet sensor 3 and the outlet temperature sensor 9 are both room temperature to 180 ℃, the temperature control precision is +/-0.5 ℃, and the network connection with a computer can be realized by an RS232 interface.
The back pressure system comprises a back pressure valve 11, a back pressure container 12, a back pressure meter 13 and a back pressure pump 14, and the outlet end of the double-rock-slab seam-cave model 6 is respectively communicated with the back pressure container 12 and the back pressure pump 14 through the back pressure valve 11;
the waste liquid recovery system comprises a gas-liquid separator 15 and a waste liquid tank 19; the back pressure valve 11, the gas-liquid separator 15, the outlet flowmeter 17, the condenser 18 and the waste liquid tank 19 are communicated in sequence, and the gas-liquid separator 15 is communicated with the outlet flowmeter 10 through a valve. The volume of the waste liquid tank 19 is 50L, and a plastic barrel is adopted. The condenser 18 adopts a coil type spiral structure and is externally provided with a cooling circulating water jacket structure.
The pipe-to-valve system includes all of the coarse piping and valves. The inner diameter of the crude line was 4 mm. The maximum pressure-bearing capacity of the valve is 7 MPa. The valve is made of Hastelloy, so that the valve can bear acid-base corrosion at working temperature.
Example 2
The working method of the acid rock reaction double-rock-plate fracture-cave simulation device in the embodiment 1 comprises the following specific steps:
(1) selecting stratum rock, namely carbonate rock, processing the stratum rock into the rock plates, wherein during simulated acidification, the two rock plates are required to be carved with slots, then the two carved surfaces are oppositely stacked and arranged in a double-rock-plate slot model space in a rock-plate corrosion clamp holder, and are cemented by a hydrophilic adhesive without a gap, during simulated acid pressing, the two carved surfaces are oppositely stacked, the distance between the rock plates is adjusted by an internal clamping groove and the clamp holder, and after the rock plates are arranged in the double-rock-plate slot model space according to the experimental requirements, the data processing system is opened to carry out pretreatment of experimental data;
(2) opening a gas vent valve 7, adjusting the pressure balance in the acid rock reaction double-rock plate slot hole simulation device, and closing the gas vent valve 7;
(3) preparing 15% acid liquor by mass concentration, and injecting the acid liquor into the intermediate container 1; opening the preheating sleeve 1, and adjusting the temperature to 90 ℃; opening the back pressure system, and setting a back pressure of 5 MPa; opening an inlet temperature sensor 4, an inlet flow meter 5, an inlet pressure sensor 6, an outlet flow meter 17, an outlet pressure sensor 10, an outlet temperature sensor 9, a condenser 18, a CT device 8 and a communicated computer processing device;
(4) setting the injection speed to be 1.5L/h, opening the acid-proof pump 2, and pumping the acid liquor in the middle container 1 into the double-rock-slab slot model 6 through the acid-proof pump 2;
(5) the flow, pressure and temperature of fluid at the inlet end of the double-rock-slab slot-cave model are collected in real time through an inlet temperature sensor 3, an inlet flowmeter 4 and an inlet pressure sensor 5, the flow, pressure and temperature of fluid at the outlet end of the double-rock-slab slot-cave model are collected in real time through an outlet flowmeter 17, an outlet pressure sensor 10 and an outlet temperature sensor 9, and picture information of the earthworm hole extension, competition, communication among slots and holes and the hole penetrating process in a three-dimensional state during the simulation of acidification is collected in real time through a CT device 8; during acid fracturing, picture information of a dynamic process of three-dimensional acid fracturing crack etching;
(6) and (4) transmitting the data and the picture information acquired in the step (5) to the data processing system to obtain real-time data of the earthworm foramen growth rate and the rock plate permeability change, and analyzing the three-dimensional earthworm foramen competition condition, the communication and punching process among the wormholes, the dynamic acid corrosion degree of the three-dimensional cracks and the acid corrosion process.
Example 3
The method for processing CT data in the simulation apparatus working method according to embodiment 2 includes the specific steps of:
(1) the acid liquor acquires the flow, pressure and temperature of the fluid at the inlet end of the double-rock-slab slot model in real time through an inlet temperature sensor 3, an inlet flowmeter 4 and an inlet pressure sensor 5, acquires the flow, pressure and temperature of the fluid at the outlet end of the double-rock-slab slot model in real time through an outlet flowmeter 17, an outlet pressure sensor 10 and an outlet temperature sensor 9, and inputs the acquired information into an information processing system in real time;
(2) before the acid liquor passes through the double-rock plate slot model space, acquiring the pore structure characteristics of the rock sample before reaction in real time;
(3) when the acid liquor passes through the double-rock plate fracture-cave model space, the data processing system is used for recording and simulating various data information changes of the double-rock plate acidification and acid fracturing processes in real time;
(4) analyzing the characteristic information of earthworm foramen extension, competition, communication among the wormholes and the process of perforating in a three-dimensional state during simulated acidification through data input information and imaging output of a CT device, and performing data processing and process analysis on dynamic etching of the cracks during simulated acid fracturing;
(5) through dynamic data fitting, the correlation and difference among all groups of experiments are analyzed on a data level, reasonable and effective optimization screening is carried out on the data, and unreasonable experiment results are eliminated;
(6) according to a plurality of groups of experimental results, under the condition of inputting initial and termination data, the information processing system can fit the possible acid corrosion condition and wormhole expansion condition during acidification, and simultaneously, the reasonable simulation according to the specific experiment is provided for the etching form of the fracture during acid fracturing.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The acid rock reaction double-rock plate fracture-cave simulation device is characterized by comprising a pressure supply injection system, a pretreatment information acquisition system, a double-rock plate fracture-cave model CT imaging system, an outlet information acquisition system, a condensation back-pressure system, a waste liquid recovery system and a data processing system; the systems are sequentially communicated through a connecting device;
the pressure supply injection system provides injection pressure for the double-rock-slab fracture-cave simulation device and adjusts the amount and speed of injected acid liquid; the pretreatment information detection system is used for adjusting the pressure and the temperature of acid liquor and collecting the pressure, the temperature and the flow information of fluid at the inlet end of the double-rock-slab fracture-cave model CT imaging system; the double-rock-plate fracture-cave model CT imaging system is used for dynamically observing the acid liquid flowing between the double rock plates and the communication and hole-penetrating process of the fracture-cave under the action of the acid liquid through a CT imaging technology; the outlet information acquisition system is used for acquiring pressure, temperature and flow information of fluid at the outlet end of the double-rock-slab slit-cave model CT imaging system; the condensation back pressure system is used for cooling the high-temperature fluid at the outlet end of the double-rock-plate model and controlling the back pressure at the outlet end to be stable under the experimental requirement; the waste liquid recovery system is used for recovering waste liquid; the data processing system is used for sorting and calculating the collected experimental data of the inlet end and the outlet end.
2. The acid rock reaction double-rock-plate slot hole simulation device as claimed in claim 1, wherein the double-rock-plate slot hole model CT imaging system comprises a rock plate corrosion holder, a CT scanning device and a rotating device, the rock plate corrosion holder is arranged on a support, and the rock plate corrosion holder is placed in the CT scanning device.
3. The acid rock reaction double-rock plate slot simulation device of claim 2, wherein the rock plate corrosion clamp comprises a box body and a thick pipe connector, wherein two side faces of the box body are provided with the thick pipe connector communicated with the box body, and a CT cavity, a rock plate fixing and clamping device and a liquid injection pipeline are arranged in the box body; the rock plate fixing and clamping device is placed in the CT cavity; the liquid injection pipeline is connected with the rock plate fixing and clamping device;
the rock plate fixing and clamping device is provided with a certain space and comprises a device main body, double rock plates cemented by a hydrophilic cementing agent, a rubber tray and a liquid cavity, wherein the liquid cavity is arranged on two sides of the device, the rubber tray is arranged in the middle of the liquid cavity, the double rock plates are fixed on the rubber tray, the clamping device is arranged in a CT cavity, a computer is connected with the CT cavity externally and can directly present CT scanning results, the CT cavity is used for dynamically observing the processes of earthworm hole extension, competition, communication and perforation among tunnels in a three-dimensional state during acidification, and the three-dimensional fracture acid etching process during acid pressing; high-temperature liquid required by the experiment is pumped into the device space through the liquid cavity communicated liquid injection pipeline, and confining pressure is added to the device space.
4. The acid rock reaction double-rock plate slot simulation device as claimed in claim 3, wherein a clamping groove is formed in the rock plate clamping device, the distance between rock plates can be adjusted through the clamping groove, the rock plate fixing and clamping device is provided with a rotating device, the rotating device comprises two rotating shafts, one end of each rotating shaft is connected with the box body, the other end of each rotating shaft is embedded into the rock plate fixing and clamping device through a key groove, and the periphery of the device is provided with the rotating shaft clamping grooves; the rotation of the rotating shaft drives the rock plate fixing and clamping device to rotate forward or laterally by 0-90 degrees.
5. The acid rock reaction double-rock-plate slot hole simulation device as claimed in claim 4, wherein the value ranges of the length, the width and the height of the box body are respectively 500mm, 200mm, 400mm and 50-100 mm; the value ranges of the length, the width and the height of the rock plate are respectively 200-300mm, 50-200mm and 5-15 mm.
6. The acid rock reaction double-rock-plate slot hole simulation device as claimed in claim 5, wherein the length, width and height of the box body are respectively 400mm, 200mm and 100 mm; the length, width and height of the rock plate are respectively 200mm, 100mm and 10 mm.
7. The acid rock reaction double-rock plate slot simulation device as claimed in claim 6, wherein the pressure supply injection system is communicated with an intermediate container through a thick pipeline, injected liquid is firstly stored in the intermediate container, the intermediate container can preserve heat of the liquid, a front space is communicated with a rock plate fixing and clamping device through a liquid injection pipeline, the liquid cavity with heat insulation materials inside the clamping device is injected into a double-rock plate slot model, and temperature and confining pressure required by experiments are provided for the rock plates in the space; the thick pipeline is connected thick pipeline interface, thick pipeline internal diameter is 4mm, and the external diameter is 40mm, two rock plates slot hole models are equipped with gaseous atmospheric valve for the adjustment pressure is the experiment demand.
8. The acid rock reaction double-rock plate slot hole simulation device as claimed in claim 7, wherein the pressure supply injection system comprises an intermediate container and an acid-resistant booster pump, the booster pump is connected with the intermediate container through a pipeline and can be used for pumping acid liquor out of the intermediate container by the booster pump;
the preheating system comprises a preheating sleeve and a temperature sensor, the preheating sleeve comprises a heating sleeve and a heat-insulating sleeve sleeved on the heating sleeve, and the intermediate container is connected with the temperature sensor; the acid-proof booster pump is communicated with the intermediate container;
the inlet detection system comprises an inlet flowmeter, an inlet pressure sensor and an inlet temperature sensor, the intermediate container is communicated with the inlet flowmeter, the inlet flowmeter is communicated with the inlet end of the double-rock-slab slotted hole model through a valve, and the inlet pressure sensor and the inlet temperature detector are connected with the inlet end of the double-rock-slab slotted hole model;
the outlet detection system comprises an outlet flowmeter, an outlet pressure sensor and an outlet temperature sensor, the outlet end of the double-rock plate slot hole model is connected with the outlet pressure sensor and the outlet temperature detector, and the outlet flowmeter is communicated with the outlet end of the gas-liquid separator through a valve;
the back pressure system comprises a back pressure valve, a back pressure container, a back pressure meter and a back pressure pump, and the outlet end of the double-rock-slab seam hole model is respectively communicated with the back pressure container, the back pressure pump and the back pressure meter through the back pressure valve;
the waste liquid recovery system comprises a gas-liquid separator, a waste liquid tank and a condenser; the back pressure valve, the gas-liquid separator, the outlet flowmeter, the condenser and the waste liquid tank are sequentially communicated, and the gas-liquid separator is communicated with the outlet flowmeter through a valve. The waste liquid recovery system comprises a gas-liquid separator and a waste liquid tank; the back pressure valve, the gas-liquid separator, the outlet flowmeter, the condenser and the waste liquid tank are sequentially communicated, and the gas-liquid separator is communicated with the outlet flowmeter through a valve.
9. The working method of the acid rock reaction double-rock-plate slot hole simulation device of claim 8 is characterized by comprising the following specific steps of:
(1) selecting stratum rock, namely carbonate rock, processing the stratum rock into the rock plates, wherein during simulated acidification, the two rock plates are required to be carved with slots, then the two carved surfaces are oppositely stacked and arranged in a double-rock-plate slot model space in a rock-plate corrosion clamp holder, the two carved surfaces are cemented by a hydrophilic adhesive without a gap, during simulated acid pressing, the two carved surfaces are oppositely stacked, the distance between the rock plates is adjusted by an internal clamping groove and the clamp holder, and after the rock plates are arranged in the double-rock-plate slot model space according to the experimental requirements, the data processing system is opened for carrying out pretreatment of experimental data;
(2) opening a gas vent valve, adjusting the pressure balance in the acid rock reaction double-rock-plate slot hole simulation device, and closing the gas vent valve;
(3) preparing acid liquor with the mass concentration of 0-37%, and injecting the acid liquor into the intermediate container; opening the preheating sleeve, and adjusting the temperature to be 20-120 ℃; opening the back pressure system, and setting a back pressure of 0-8 MPa; opening the inlet flow meter, the inlet pressure sensor, the inlet temperature sensor, the outlet flow meter, the outlet pressure sensor, the outlet temperature detector, the condenser, the CT device and the communicated computer processing device;
(4) setting the injection speed to be 0-3L/h, opening the acid-resistant pump, and pumping the acid liquor in the intermediate container into the double-rock-slab seam hole model through the acid-resistant pump;
(5) the flow, the pressure and the temperature of fluid at the inlet end of the double-rock-slab slot-cave model are collected in real time through the inlet flowmeter, the inlet pressure sensor and the inlet temperature detector, the flow, the pressure and the temperature of fluid at the outlet end of the double-rock-slab slot-cave model are collected in real time through the outlet flowmeter, the outlet pressure sensor and the outlet temperature detector, and picture information of the earthworm hole extension, competition, communication among slots and holes and the hole penetrating process in a three-dimensional state during acidification is collected in real time through the CT device; during acid fracturing, picture information of a dynamic process of three-dimensional acid fracturing crack etching;
(6) and (4) transmitting the data and the picture information acquired in the step (5) to the data processing system to obtain real-time data of the earthworm foramen growth rate and the rock plate permeability change, and analyzing the three-dimensional earthworm foramen competition condition, the communication and punching process among the wormholes, the dynamic acid corrosion degree of the three-dimensional cracks and the acid corrosion process.
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