CN105114049A - Experimental device for simulating hydrofracture action mechanism in steam assisted gravity drainage (SAGD) process - Google Patents
Experimental device for simulating hydrofracture action mechanism in steam assisted gravity drainage (SAGD) process Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 claims abstract description 22
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- 238000002474 experimental method Methods 0.000 claims description 63
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Abstract
The invention discloses an experimental device for simulating a hydrofracture action mechanism in the steam assisted gravity drainage (SAGD) process. The experimental device comprises a true triaxial stress loading device, a steam heating device, a fracture device and an acoustic emission monitoring device. The true triaxial stress loading device can apply stress in three directions to an experimental rock sample through a pressure chamber. The steam heating device locally heats the experimental rock sample through a hot steam circulation pipeline prefabricated in the experimental rock sample and monitors the temperature of the experimental rock sample through a temperature sensor arranged on the surface of the experimental rock sample. The fracture device injects fracturing fluid into the experimental rock sample through a shaft prefabricated in the experimental rock sample. The acoustic emission monitoring device monitors acoustic emission signals generated inside the experimental rock sample and determines the crack spatial position through a corresponding positioning algorithm. By the adoption of the experimental device, the SAGD hydrofracture process under a high-temperature and high-pressure condition is simulated, and thus true and effective evaluation and reference are provided for hydrofracture construction design of a thickened-oil oilfield.
Description
Technical field
The invention belongs to rock mechanics fracturing research field, be specifically related to a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process.
Background technology
In China and world wide, all there is abundant heavy crude reservoir resource, SAGD technology is the important way of current viscous crude development of resources, but enter mid-later development phase along with many oil fields, constantly there is the exploitation difficult problems such as High water cut, hyposmosis, super-viscous oil, oil field oil production is successively decreased seriously, and traditional heavy crude heat extraction technology need innovate upgrading.On the other hand, one of main increasing yield and injection mode of low permeability reservoirs is developed in fracturing, for raising oil recovery rate Be very effective.Therefore combined by two kinds of petroleum resources production techniques, significant for viscous crude field volume increase, this, just to the laboratory research that SAGD technology combines with fracturing technique, proposes new demand and new challenge.
At present due to the restriction of fracturing experiments equipment, the hydraulic fracturing experiments that most of laboratory is carried out is conventional hydraulic fracturing experiments, namely only considers that geostatic stress condition is on the impact of fracturing effect, and have ignored the impact of high temperature.Even if consider the impact of temperature, usually also just adopt and carry out experiment to the mode of experiment rock sample entirety heating, in this and SAGD process, there is larger difference in the local heating of gas injection well formation.Therefore in order to the truer mechanism of action must simulating and probe into fracturing in SAGD process, invent this experimental facilities and propose corresponding experimental technique.
Summary of the invention
In order to solve Problems existing in above-mentioned existing experimental study, the invention provides a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process, namely simulating the SAGD hydraulic fracturing process under high-temperature and high-pressure conditions.
The technical solution adopted in the present invention is for this reason:
Simulate an experimental facilities for the fracturing mechanism of action in SAGD process, comprise true triaxial stress loading device, steam heater, fracturing device and acoustic emission monitor(ing) device.True triaxial stress loading device, described true triaxial stress loading device mainly comprises jack and confined pressure cylinder, defines the balancing gate pit of rectangular shape between jack, for placing the experiment rock sample in rectangular shape.Steam heater, described steam heater comprises temperature pick up, steam source and is formed on the vapours pipeloop of experiment rock sample inside in advance.Fracturing device, described fracturing device comprises two-chamber constant speed injection pump, the fracturing fluid that is formed on the pit shaft of experiment rock sample inside in advance and connects pit shaft and two-chamber constant speed injection pump injects pipeline.Acoustic emission monitor(ing) device, described acoustic emission monitor(ing) device comprises Acoustic radiating instrument, multiple acoustic emission probe, and acoustic emission probe is connected with Acoustic radiating instrument by data wire, and all acoustic emission probes are all embedded in advance reserved, are positioned in the groove on experiment rock sample surface.This experimental facilities can apply the stress in three directions to experiment rock sample, and by the vapours pipeloop in advance in experiment rock sample, spot heating is carried out to experiment rock sample, thus in real simulation SAGD process, the HTHP coupling stress state residing for reservoir.Simultaneously by the pit shaft in advance in experiment rock sample, fracturing fluid is injected in experiment rock sample, with the fracturing mechanism of action simulated and probe under above-mentioned coupling stress state, for fracturing site operation schematic design and heat flow piercement theoretical research provide strong experiment to support.
A kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process as above, wherein said steam source can provide the different rates of heat addition.
A kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process as above, the position of wherein said heat steam pipeloop in experiment rock sample, there is multiple arrangement, experimentally the difference of object, select rational vapours pipeloop arrangement.
A kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process as above, the length of wherein said pit shaft must not exceed the half of experiment rock sample length.
A kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process as above, wherein said acoustic emission probe number must not be less than 4.
A kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process as above, the appearance and size of wherein said experiment rock sample is 300mm × 300mm × 600mm, and the external diameter of pit shaft is 20mm, and vapours pipeloop external diameter is 10mm.
In a kind of SAGD of simulation process of the present invention, the working method of the experimental facilities of the fracturing mechanism of action is:
First, for different research purposes, determine the rate of heat addition of steam source, determine that balancing gate pit applies the size of three-dimensional stress, determine the arrangement of vapours pipeloop, determine the charge velocity of two-chamber constant speed injection pump; Then true triaxial stress loading device is adopted, by applying the three-dimensional stress of different size, the crustal stress states of simulation actual formation; Adopt steam heater, the gas injection well in simulation SAGD process, carries out spot heating to experiment rock sample, and by temperature pick up Real-Time Monitoring experiment rock sample temperature, until target temperature; Adopt fracturing device to carry out Simulated Water horizontal well pressure break, by two-chamber constant speed injection pump, and in advance built in the pit shaft of experiment rock sample inside, in experiment rock sample, inject fracturing fluid with constant rate of speed, and of the fracturing fluid pressure in Real-time Collection pit shaft; Adopt acoustic emission monitor(ing) device simultaneously, by being arranged in multiple acoustic emission probes on experiment rock sample surface, receive the acoustic emission signal produced due to the crack initiation in crack and expansion, and pass through the built-in software program of Acoustic radiating instrument, process is positioned to the acoustic emission signal received, thus determines to test the crack starter location of rock sample internal fissure and the locus of whole fracture surface.
Feature of the present invention and advantage are:
The present invention proposes a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process, compare traditional hydraulic fracturing experiments, the present invention is by the pre-vapours pipeloop built in experiment rock sample inside, spot heating is carried out to experiment rock sample, thus simulate more really in SAGD hydraulic fracturing process, under heat flow piercement condition, the crack initiation in crack and developmental state; Analogue experiment installation disclosed in this invention is simple to operate, with strong points, in SAGD process, the research of the fracturing mechanism of action provides effective means.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein,
Fig. 1 is the longitudinal sectional drawing that the present invention simulates the experimental facilities of the fracturing mechanism of action in SAGD process;
Fig. 2 is vapours pipeloop single-sided arrangement schematic diagram;
Fig. 3 is that vapours pipeloop is arranged vertically schematic diagram;
Fig. 4 is that vapours pipeloop is in tilted layout schematic diagram;
Drawing reference numeral illustrates:
1, balancing gate pit; 2, temperature pick up; 3, Acoustic radiating instrument; 4, steam source; 5, vapours return port; 6, vapours discharge port; 7, temperature sensor data line; 8, sound emission data wire; 9, fracturing fluid injects pipeline; 10, two-chamber constant speed injection pump; 11, pit shaft; 12, acoustic emission probe; 13, confined pressure SERVO CONTROL pump; 14, vapours pipeloop; 15, rock sample is tested
Detailed description of the invention
The present invention proposes a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process, in order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
Embodiment 1: the invention discloses a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process as shown in Figure 1, comprises true triaxial stress loading device, steam heater, fracturing device and acoustic emission monitor(ing) device.
Shown in composition graphs 1, the present invention relates to experiment rock sample is that the 300mm × 300mm × 600mm built by cement mortar tests rock sample 15.When joints cement mortar experiment rock sample, need pit shaft 11 and vapours pipeloop 14 to be placed in advance in irony mould, together build.When building, pit shaft 11 outlet is placed on experiment rock sample center, the position of vapours pipeloop 14 can experimentally require to place flexibly with experiment purpose, and the simultaneously import and export of vapours pipeloop 14 and pit shaft 11 entrance are all drawn from its right end face of cuboid experiment rock sample.
Shown in composition graphs 1, the balancing gate pit 1 that the confined pressure required for experiment is made up of jack and confined pressure cylinder provides, and keeps the effectively constant of confined pressure in experimentation by confined pressure SERVO CONTROL pump 13.Balancing gate pit's its right end face leaves the circular open of diameter 50mm simultaneously, injects the turnover of pipeline 9 for vapours return port 5, vapours eliminating port 6 and fracturing fluid.
Shown in composition graphs 1, steam heater forms primarily of vapours pipeloop 14, temperature pick up 2, temperature sensor data line 7 and steam source 4, vapours return port 5, vapours discharge port 6.First steam source 4 produces vapours, and by vapours discharge port 6, vapours is entered vapours pipeloop 14, the a large amount of heat energy carried in vapours pass to experiment rock sample 15 by vapours pipeloop 14, and the steam after heat trnasfer flows back to steam source 4 by vapours return port 5 and reheats.Be arranged in the temperature pick up 2 in experiment rock sample 15 surface groove simultaneously, until be heated to target temperature, thus realize heating to experiment rock sample.
Shown in composition graphs 1, fracturing device forms primarily of two-chamber constant speed injection pump 10, fracturing fluid injection pipeline 9 and pit shaft 11.During fracturing device work, by two-chamber constant speed injection pump 10 with constant charge velocity, inject pipeline 9 by fracturing fluid and inject fracturing fluid to pit shaft 11.Fracturing fluid is by pit shaft 11 injection experiments rock sample, and of the fracturing fluid force value in two-chamber constant speed injection pump 10 Real-Time Monitoring pit shaft 11 simultaneously, to realize fracturing simulation.
Shown in composition graphs 1, acoustic emission monitor(ing) device is formed primarily of acoustic emission probe 12, sound emission data wire 8, Acoustic radiating instrument 3.The acoustic emission signal that experiment rock sample 15 produces in fracturing process, received by the acoustic emission probe 12 being distributed in experiment rock sample surface, and by sound emission data wire 8, the acoustic emission signal received is transferred to Acoustic radiating instrument 3, and by Acoustic radiating instrument 3, process is positioned to the acoustic emission signal received, wherein acoustic emission probe 12 and sound emission data wire 8 are all placed on and have in advance cut a hole, be positioned in the groove on experiment rock sample surface, in order to avoid acoustic emission probe 13 and sound emission data wire 8 suffer squeeze and destroy when testing rock sample pressurized.
Below the using method of above-mentioned experimental facilities is explained as follows:
In the present embodiment, the rate of heat addition of steam source 4 is 20 DEG C/h, and target temperature is 50 DEG C, and vapours heating pipeline 14 is illustrated in figure 2 and is arranged vertically.
The using method of above-mentioned experimental facilities, specifically comprises the following steps:
Step 1, above-mentioned build and the concrete experiments rock sample 15 solidified surface cutter pick and place the groove put required for acoustic emission probe 12, temperature pick up 2 and data wire, and with couplant, acoustic emission probe 12 and temperature pick up 2 are pasted in corresponding recesses position, and data wire is layed in corresponding recesses, Taking Pictures recording is carried out, for later experiments Comparative result is prepared to experiment rock sample surface simultaneously;
Step 2, by experiment rock sample 15 be placed in the balancing gate pit 1 of true triaxial charger, and sound emission data wire 8 other end is connected to Acoustic radiating instrument 3, temperature sensor data line 7 other end is connected to steam source 4, fracturing fluid entry port on the right side of pit shaft 11 and fracturing fluid is injected pipeline 9 and is connected;
Step 3, startup confined pressure SERVO CONTROL pump 13, apply confined pressure by the three-dimensional confined pressure value set to experiment rock sample 15;
Step 4, by above-mentioned heater to experiment rock sample 15 carry out spot heating, open Acoustic radiating instrument 3 simultaneously, the acoustic emission signal produced in heating process is gathered, and by temperature pick up 2 Real-Time Monitoring experiment rock sample temperature, until Heating Experiment rock sample 15 to target temperature value;
After step 5, experiment rock sample 15 temperature reach target temperature value, stop heating, start two-chamber constant speed injection pump 10 in pit shaft 11 simultaneously, fracturing fluid is injected with constant rate of speed, and of the fracturing fluid force value in Real-Time Monitoring and record pit shaft 11, until experiment rock sample 15 destroys, in addition in whole experimentation, acoustic emission monitor(ing) device remains duty, the acoustic emission signal produced in Real-Time Monitoring experiment rock sample 15 pressure break destructive process, and the crack initiation of fracture and expansion position process;
Step 6, experiment rock sample 15 destroy, after fracturing fluid flows out through experiment rock sample 15 surface, close two-chamber constant speed injection pump 10, fracturing fluid is stopped to inject, close Acoustic radiating instrument 3 simultaneously, stop acoustic emission signal collection, then unload confined pressure to 0 force value by confined pressure SERVO CONTROL pump 13, then remove the connecting line that each device is relevant, and experiment rock sample 15 is shifted out balancing gate pit;
Step 7, to experiment after experiment rock sample 15 surface take pictures, then become thickness to cut into slices uniformly experiment rock sample 15 cutting with fish gutting machine, observe the fractue spacing in each section, and take pictures.
Step 8, above-mentioned experimental result is utilized to launch researching and analysing of the fracturing mechanism of action in SAGD process.
Embodiment 2: a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process, is with embodiment 1 difference, and the rate of heat addition of steam source 4 is 40 DEG C/h.
Embodiment 3: a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process, is with embodiment 1 difference, and the rate of heat addition of steam source 4 is 60 DEG C/h.
Embodiment 4: a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process, is with embodiment 1 difference, target temperature is 100 DEG C.
Embodiment 5: a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process, is with embodiment 1 difference, target temperature is 150 DEG C.
Embodiment 6: a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process, is with embodiment 1 difference, target temperature is 200 DEG C.
Embodiment 7: a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process, is with embodiment 1 difference, and vapours heating pipeline 14 is illustrated in figure 3 single-sided arrangement.
Embodiment 8: a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process, is with embodiment 1 difference, and vapours heating pipeline 14 is illustrated in figure 4 and is in tilted layout, and is 20 ° with horizontal plane angle.
Embodiment 9: a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process, is with embodiment 1 difference, and vapours heating pipeline 14 is illustrated in figure 4 and is in tilted layout, and is 40 ° with horizontal plane angle.
Embodiment 10: a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process, is with embodiment 1 difference, and vapours heating pipeline 14 is illustrated in figure 4 and is in tilted layout, and is 60 ° with horizontal plane angle.
Embodiment 11: a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process, is with embodiment 1 difference, and vapours heating pipeline 14 is illustrated in figure 4 and is in tilted layout, and is 80 ° with horizontal plane angle.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.Any those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.
Claims (8)
1. simulate an experimental facilities for the fracturing mechanism of action in SAGD process, comprise true triaxial stress loading device, steam heater, fracturing device and acoustic emission monitor(ing) device, it is characterized in that:
Described true triaxial stress loading device, mainly comprises confined pressure cylinder and jack, defines the balancing gate pit of rectangular shape between jack, for placing the experiment rock sample in rectangular shape; Described steam heater, comprises vapours pipeloop, temperature pick up and steam source; The fracturing fluid that described fracturing device comprises pit shaft, two-chamber constant speed injection pump and connects pit shaft and two-chamber constant speed injection pump injects pipeline; Described acoustic emission monitor(ing) device comprises Acoustic radiating instrument, multiple acoustic emission probe, and acoustic emission probe is connected with Acoustic radiating instrument by data wire, all acoustic emission probes be all embedded in be reserved in advance experiment rock sample surface groove in.
2. a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process according to claim 1, it is characterized in that: the mode of heating that heater adopts is vapours heating, and be spot heating, more similar with the local heating of gas injection well formation in SAGD process.
3. a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process according to claim 1, is characterized in that: vapours pipeloop is formed on experiment rock sample in advance when building experiment rock sample inner.
4. a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process according to claim 1, is characterized in that: the rate of heat addition that steam source can provide is 20 DEG C/h or 40 DEG C/and h or 60 DEG C/h.
5. a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process according to claim 1, is characterized in that: vapours pipeloop has three class arrangements, namely single-sided arrangement, be arranged vertically, be in tilted layout.
6. a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process according to claim 1, is characterized in that: angle of inclination when vapours pipeloop is in tilted layout is 20 ° or 40 ° or 60 ° or 80 °.
7. a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process according to claim 1, is characterized in that: the quantity of acoustic emission probe must not be less than 4.
8. a kind of experimental facilities of simulating the fracturing mechanism of action in SAGD process according to claim 1, it is characterized in that: the appearance and size of described experiment rock sample is 300mm × 300mm × 600mm, the external diameter of pit shaft is 20mm, and vapours pipeloop external diameter is 10mm.
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