CN109001438A - A kind of joint seal gas shutoff experimental simulation device and test method - Google Patents
A kind of joint seal gas shutoff experimental simulation device and test method Download PDFInfo
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- CN109001438A CN109001438A CN201710418704.4A CN201710418704A CN109001438A CN 109001438 A CN109001438 A CN 109001438A CN 201710418704 A CN201710418704 A CN 201710418704A CN 109001438 A CN109001438 A CN 109001438A
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- 238000004088 simulation Methods 0.000 title claims abstract description 35
- 238000010998 test method Methods 0.000 title claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract description 86
- 238000005553 drilling Methods 0.000 claims abstract description 64
- 239000011435 rock Substances 0.000 claims abstract description 63
- 238000002474 experimental method Methods 0.000 claims abstract description 51
- 230000000694 effects Effects 0.000 claims abstract description 23
- 238000012360 testing method Methods 0.000 claims abstract description 23
- 238000004458 analytical method Methods 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 121
- 238000006073 displacement reaction Methods 0.000 claims description 42
- 239000007788 liquid Substances 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 239000000706 filtrate Substances 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 5
- 229910018487 Ni—Cr Inorganic materials 0.000 claims description 2
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims 1
- 238000011156 evaluation Methods 0.000 abstract description 15
- 230000015572 biosynthetic process Effects 0.000 abstract description 10
- 238000011160 research Methods 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 16
- 238000000034 method Methods 0.000 description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 10
- 239000002002 slurry Substances 0.000 description 7
- 239000000440 bentonite Substances 0.000 description 5
- 229910000278 bentonite Inorganic materials 0.000 description 5
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000005341 toughened glass Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Earth Drilling (AREA)
Abstract
The present invention relates to a kind of joint seal gas shutoff experimental simulation devices and test method in the experimental provision field of simulation oil and gas well drilling.The joint seal gas shutoff experimental simulation device includes microcrack rock core, and microcrack blocks test macro, gas pressure-bearing test macro.The present invention can be in different rates of circulating flow, pressure difference, under the experiment conditions such as temperature, closure evaluation experimental is carried out to containing single or combination microcrack rock core, analysis compares different drilling fluids to the wastage of the microcrack of different fracture apertures, the plugging characteristics of various drilling fluids are studied in realization, the characteristics of simulating underground microcrack gas cut pit shaft simultaneously, test blocks rock core gas pressure-bearing ability and gas flow rate, the joint seal gas-stopping effect of microcrack is blocked up in appraisal drilling fluid-tight, for microcrack carbonate formation, the safety drilling of the shale formation of microfissure development provides a kind of new evaluation experimental research means.
Description
Technical field
The present invention relates to the experimental provision fields of simulation oil and gas well drilling, furtherly, it is stifled to be related to a kind of joint seal
Gas experimental simulation device and test method.
Background technique
In oil exploration and exploitation drilling process, the fluid (oil, gas and water etc.) in stratum enters pit shaft, may cause
Overflow, if out of control will lead to blowout.Gas-liquid displacement mostly occurs in fractured reservoir especially vertical fracture stratum, root
, the reason is that drilling fluid enters fracture spaces, the natural gas that extruding is stored in crack causes gas pressure to increase for this.Meanwhile
Drilling fluid into crack is necessarily distributed in crack lower part, and natural gas is expressed to the top in crack, when gas pressure increases
To when being more than the effective head of liquid of pit shaft, it is poor that local decompression is generated in crack tip, in order to maintain original pressure balance,
Gas can invade pit shaft in crack, and then induce gas cut.The area that gas-liquid displaced type gas cut most typically occurs is in China's tower
In the Ordovician system target zone drilling well of wood oil field TZ area deep.Its fracture hole type oil-gas reservoir gas-liquid replacing velocity is fast, circulating exhaust is made
The industry time is long, and leakiness is become estranged overflow, it is static after circulation total hydrocarbon value is high, evacuation time is long, cause reservoir drilling well timeliness low, drilling well week
Phase is long.The key of the anti-gas cut of fracture hole type oil-gas reservoir joint seal gas shutoff is the closure of formation densification that can be faster and better in crack
Layer, realization quickly and effectively block, and prevent drilling fluid from entering crack under micro- overbalanced conditions, gas in pressure fissure, so that
Gas enters pit shaft in crack.
Experimental provision and method of the laboratory without directly progress joint seal gas-stopping effect evaluation at present.Drilling fluid is carried out indirectly
The method of plugging effect evaluation experiment mainly has: the experiment of high temperature and pressure leak-off casting bed, simulation fracture block experiment.High temperature and pressure filter
Losing casting bed experiment is to be fabricated to casting bed with the combination back-up sand of certain mesh number, evaluates plugging effect by measurement filter loss, such
Experiment is only capable of simulation drilling fluid to the plugging effects of sandstone pores, can not simulated formation microcrack plugging effect.Simulation fracture
It blocks experiment and closure experiment is mainly carried out using the simulation core of steel plate module or organic glass module making, this 2 kinds of methods
The simulation core of production, first is that slit width at 500 μm or more, second is that seam face is smooth, is delineated by certain surface, can not also be simulated
The rock on true stratum stitches surface roughness.
(army's vertical fracture stratum gas-liquid of Lee is replaced and the anti-gas cut blocking technology of drilling fluid studies the southwest petroleum for the army of Lee
University Ph.D's degree opinion, 2014.6.) one kind is disclosed with automatic data collection and pressure auto restore facility, crack panel
The adjustable vertical fracture gas-liquid displacement of detachable and fracture width (0.3~1.0mm) and the anti-gas cut experiment test dress of joint seal gas shutoff
It sets, room temperature Imitating microcrack can be carried out and block experimental study.
(Liu Yonggui, Song Tao block evaluation method and its application-with army high temperature deep well microcrack slowly with pine to Liu Yonggui etc.
Gas industry for distant basin Xushen gas field, 2016.36 (2)) disclose the use alumino-silicate close with rock composition
Material makes a kind of technology of novel microcrack core model, and microcrack aperture stitches surface roughness, hole between 1~50 μm
Developmental state and seam face form are more nearly with intrinsic fracture, and autonomous Design microcrack closure evaluating apparatus, operating temperature reaches
200 DEG C, for operating pressure between 3.5~5.0MPa, the flow regime of analog underground work liquid, which is carried out, blocks experimental study.
(Li Chunxia, Huang march Li Chunxia etc., Cui Mao honor appraisal drilling liquid Completion Fluid On Fractured formation shut-off effect
New method Southwest Petrol University journal natural science edition, 2003,25 (5): method disclosed in 57~59.) is to utilize 387-42 type
Voltage slurry dehydration instrument, packing layer make filling out for packing layer using the quartz sand of 10~20 mesh, 20~40 mesh and 80~100 mesh three types
Fill particle, the plugging effect of tightly packed later appraisal drilling liquid, completion fluid.
The Chinese patent of Publication No. CN103485762A is related to a kind of visual Simulation mud shale microcrack shut-off capacity
Test macro and its test method, by solution or drilling fluid containing various concentration, variety classes sealing agent, in different pressures
Under the experiment conditions such as difference and time, displacement is carried out to single or combination microcrack rock sample and blocks evaluation experimental, compares depth of invasion
Etc. indexs and directly in description drilling well internal filter cake formation situation, preferably suitable drilling fluid sealing agent and OPTIMIZATION OF DRILLING FLUID system
Formula, solve not can be carried out the experiment condition that mud shale microcrack blocks visual Simulation evaluation in the past.But it is used
Rock sample be etching fracture tempered glass, not enough really close to true stratum microcrack feature, not can be carried out gas-stopping effect and evaluate.
Above method has rated the sealing characteristics of drilling fluid to a certain extent, but can not all simulate the crack on true stratum
The case where feature, it is even more impossible to simulated formation gas cuts, carries out the simulated experiment evaluation of joint seal gas shutoff.Therefore, it is badly in need of a kind of energy simulation
Microcrack, and the simulator and evaluation method of microcrack joint seal gas-stopping effect can be tested.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the present invention proposes a kind of joint seal gas shutoff experimental simulation device,
Relate in particular to a kind of joint seal gas shutoff experimental simulation device and test method.Joint seal gas shutoff experiment simulation dress provided by the invention
It sets, simulation down-hole drilling fluids temperature and pressure situation, gas cut feature, microcrack feature carry out effectively simulated experiment.Using of the invention
Device and method can qualitative research difference fracture width, pressure difference of blocking, block grain graininess gradation, concentration the problems such as；It can be real
The fast and effective closure of existing fracture, preventing gas-liquid from replacing, gas cut occurs and theory and technology method basis is established in development, finally
Construct it is a set of prevent fracture formation occur gas-liquid displacement the effective drilling fluid blocking technology of gas cut.
A kind of joint seal gas shutoff experimental simulation device of one of the object of the invention, including microcrack rock core 10, microcrack block
Test macro, gas pressure-bearing test macro；
It includes fluid reservoir 1, constant-flux pump 2, high pressure line 3, shut-off valve 1, pressure gauge that the microcrack, which blocks test macro,
One 5, pressure reducing valve 1, core holding unit 9, shut-off valve 2 14, graduated cylinder 15；
The core holding unit 9 includes circulation fluid entrance 27, circulation fluid outlet 28, filtrate (liquid 29, gas access 30, gas
Body exports 31, heating mantle 8, confining pressure entrance 22；Confining pressure pump 11 is equipped with the pipeline of confined pressure control valve 12 and confining pressure table 13 by one section
It is connected with the confining pressure entrance 22 of core holding unit 9；The heating mantle 8 connects temperature control equipment 7；
The inlet of the constant-flux pump 2 is connected by pipe string with fluid reservoir 1；Described the another of constant-flux pump 2 brings out liquid
Mouth is connected by one section equipped with shut-off valve 1 and the high pressure line of pressure gauge 1 and the circulation fluid entrance of core holding unit 9；Institute
The circulation fluid outlet for stating core holding unit 9 is connected by one section of pipeline equipped with pressure reducing valve 1 with fluid reservoir 1；
The gas pressure-bearing test macro includes nitrogen cylinder 16, pressure reducing valve 2 17, displacement pressure control valve 18, pressure gauge two
19, gas outlet valve 20, gas flowmeter 21；
The nitrogen cylinder 16 by one section of pipeline equipped with pressure reducing valve 17, displacement pressure control valve 18 and pressure gauge 2 19 with
30 one end of gas access of core holding unit 9 is connected；
The gas flowmeter 21 connects the gas vent 31 of the core holding unit 9 by gas outlet valve 20.
The core holding unit 9 further includes the rock core aid set 25 for placing rock core, and the rock core aid set 25 is resistant to high temperatures
Rubber sleeve, for the microcrack rock core 10 described in tight under the conditions of confining pressure；It can be fixed in the rock core aid set 25 slotting
Enter one group of rock sample microcrack rock core 10 to be measured, 25 both ends of rock core aid set are fixed by rock core plunger 24, rock core plug 23；Institute
The nickel-chromium resistance wire that heating mantle 8 is wrapped with insulation is stated, the insulating materials is selected from glass fibre；The heating mantle 8 connects
Temperature control equipment 7；Outside is kept the temperature by insulation shell 26.
The microcrack rock core 10 is the natural of diameter 2.5cm, the crack containing single of 3~6cm of length or double cracks
Rock core or artificial core；It can be selected from rock core commonly used in the art.The width in the crack is 20~500 μm.
The second object of the present invention is to providing a kind of test method of joint seal gas shutoff experimental simulation device, comprising the following steps:
1) it builds device: the inlet of the constant-flux pump 2 is connected by pipe string with fluid reservoir 1；The constant-flux pump 2
The liquid outlet circulation fluid entrance that passes through one section of high pressure line 3 and core holding unit 9 equipped with shut-off valve 1 and pressure gauge 1
27 are connected；The circulation fluid outlet 28 of the core holding unit 9 is connected by one section of pipeline equipped with pressure reducing valve 1 with fluid reservoir 1；
The filtrate (liquid 29 of 9 other end of core holding unit is connected by shut-off valve 2 14 with graduated cylinder 15；As needed, before graduated cylinder also
One condensation recipient can be installed；
The confining pressure pump 11 is equipped with confined pressure control valve 12 and the pipeline of confining pressure table 13 and enclosing for core holding unit 9 by one section
Mouth is pressed into be connected；The temperature control equipment 7 connects heating mantle 8；
The nitrogen cylinder 16 by one section of pipeline equipped with pressure reducing valve 17, displacement pressure control valve 18 and pressure gauge 2 19 with
The gas access 30 of core holding unit 9 is connected；
The gas flowmeter 21 connects the gas vent 31 of the core holding unit 9 by gas outlet valve 20；
By unscrewing the screw knob at 9 both ends of core holding unit, the microcrack rock core 10 is put into rock core clamping
In device 9, fixed with rock core plug 23, rock core plunger 24, screw thread knob；
It is described build device step after the completion of, comprehensively check pipeline junction whether be completely embedded, just whether valve switch
Often, whether pressure gauge reading is accurate.
2) experiment drilling fluid is added: configured drilling fluid being added into fluid reservoir 1；The drilling fluid can be
500~1000mL；The closure slurry that the drilling fluid can be bentonite slurry, drilling fluid and other microcrack materials containing closure is equal
It can.
3) displacement blocks experiment: confined pressure control valve 12 is opened, 10 are forced into core holding unit 9 by confining pressure pump 11~
15MPa closes confined pressure control valve 12 after pressurization；The temperature that temperature control equipment 7 improves heating mantle 8 is opened, rises to reality to temperature
After testing temperature, using constant-flux pump 2 to 9 cavity circulation drilling fluid of core holding unit；By changing flow velocity, different displacements is provided
Pressure, 0~8MPa of displacement pressure value (such as can be 0.1,0.2,0.5,1.0,3.0,5.0,8.0MPa), under each displacement pressure
5~10min is maintained, shut-off valve 2 14 is opened, lost fluid is received by pipeline graduated cylinder 15, records wastage；
4) after the completion of displacement blocks experiment, shut-off valve 1, pressure reducing valve 1, shut-off valve gas pressure-bearing test experiments: are closed
2 14, gas outlet valve 20 is opened, confining pressure, temperature-resistant is kept, gas drive pressure is adjusted (such as by displacement pressure control valve 18
Can be 0.1,0.2,0.5,1.0,2.0,3.0,4.0, the pressure values such as 5.0MPa), each gas drive pressure spot maintains 1~30min,
The pressure value for recording breakthrough of gas reservoir core plugging layer, is recorded in the gas flow in each period by gas flowmeter 21,
It analyzes drilling fluid and blocks microcrack effect.
3) displacement blocks in experiment, and the rate of circulating flow of the circulating drilling fluid is 0.01~100.00mL/min.
3) displacement blocks in experiment, experimental temperature≤150 DEG C, preferably room temperature~120 DEG C.
3) displacement blocks in experiment, the displacement pressure value can be selected from 0.1,0.2,0.5,1.0,3.0,5.0,
8.0MPa；5~10min is maintained under each displacement pressure.
4) in the gas pressure-bearing test experiments, the gas drive pressure value can be selected from 0.1,0.2,0.5,1.0,2.0,3.0,
4.0,5.0MPa；Each gas drive pressure spot maintains 1~30min.
The present invention is followed by solution or drilling fluid the plugging material containing different type, proportion, concentration in difference
Under the experiment conditions such as circulation speed, pressure difference, temperature, closure evaluation experimental is carried out to containing single or combination microcrack rock core,
Analysis compares different drilling fluids to the wastage of the microcrack of different fracture apertures, realize to the plugging characteristics of various drilling fluids into
The characteristics of going and analyze and research, while simulating underground microcrack gas cut pit shaft, test block rock core gas pressure-bearing ability and gas
The joint seal gas-stopping effect of microcrack is blocked up in flow velocity, appraisal drilling fluid-tight, thus preferably suitable drilling fluid joint seal gas shutoff material and excellent
Drilling fluid system formulation, solves that not can be carried out joint seal gas shutoff simulated experiment in the past difficult, be microcrack carbonate formation,
The safety drilling of the shale formation of microfissure development provides a kind of new evaluation experimental research means.
Compared with prior art, the present invention the beneficial effect is that:
1) microcrack core plugging can be carried out: by the microcrack of artificial/natural core, 20~500 μ of fracture width
M simulates the microcrack aperture and fracture surface roughness on true stratum, and gear to actual circumstances stratum, improves the closure material that experiment preferably goes out
The reliability of material and system performance.
2) analog down-hole drilling fluids environment carries out closure experiment: passing through the ringing of constant-flux pump, the heating of clamper
Effect, simulates true down-hole drilling fluids in the loop condition of underground, improves the validity of experimental data.
3) overall evaluation drilling fluid joint seal gas shutoff situation can be integrated: by blocking microcrack system and gas pressure-bearing test system
System, can overall merit plugging material and drilling fluid system closure microcrack ability and simulation gas cut situation, test plugging material
The generation of gas cut can be effectively prevented, drilling safety is improved.
4) the invention analog down-hole drilling fluids temperature (150 DEG C), cycling condition, effective evaluation block drilling fluid for micro-
The joint seal gas-stopping effect of crack rock core (20~500 μm), preferably out wastage (1h) < 1mL, gas survey bearing capacity > 5MPa's
Joint seal gas shutoff system or material provide reliable experimental data support for preferred, the gradation of plugging material, to form a sleeve
Stitch the experimental evaluation method and operating process of gas shutoff.
Detailed description of the invention
Fig. 1 is the schematic diagram of joint seal gas shutoff experimental simulation device of the present invention；
Fig. 2 is the schematic diagram of core holding unit in joint seal gas shutoff experimental simulation device of the present invention；
In figure: 1. fluid reservoirs, 2. constant-flux pumps, 3. high pressure lines, 4. shut-off valves one, 5. pressure gauges one, 6. pressure reducing valves one, 7.
Temperature control equipment, 8. heating mantles, 9. core holding units, 10. microcrack rock cores, 11. confining pressures pump, 12. confined pressure control valves, 13.
Confining pressure table, 14. shut-off valves two, 15. graduated cylinders, 16. nitrogen cylinders, 17. pressure reducing valves two, 18. displacement pressure regulating valves, 19. pressure gauges
Two, 20. gas outlet valves, 21. gas flowmeters, 22. confining pressure entrances, 23. rock core plugs, 24. rock core plungers, 25. rock cores
Aid set, 26. insulation shells, 27. circulation fluid entrances, the outlet of 28. circulation fluids, 29. filtrate (liquids, 30. gas accesses, 31. gas
Body outlet.
Specific embodiment
Below with reference to embodiment, the present invention is further illustrated.But the present invention is not restricted by the embodiments.
Embodiment 1
1. configuration concentration is 2% bentonite slurry, choose 2 kinds of calcium carbonate superfine powder plugging materials: 100 mesh calcium carbonate superfine powders and
2 kinds of plugging materials are added in 2% bentonite slurry 400 mesh calcium carbonate superfine powders, are configured to the experiment drilling fluid that concentration is 2%
500mL is stand-by.
2. experimental facilities and pipeline are linked and packed according to shown in Fig. 1, and check whether pipeline junction connects comprehensively
Closely, whether valve switch is normal, and whether pressure gauge reading is accurate.Choosing fracture aperture is 100 μm, 3~6cm of length, diameter
The natural core of 2.5cm is as microcrack rock core 10.
By unscrewing the screw knob at 9 both ends of core holding unit, so that core holding unit 9 is opened, by the fine fisssure
Seam rock core 10 is put into the aid of the rock core in core holding unit 9 set 25, is fixed, is revolved with rock core plug 23, rock core plunger 24
The screw knob at upper both ends；Before experiment, prepared experiment drilling fluid is poured slowly into 1 in fluid reservoir.
3. displacement blocks experiment: confined pressure control valve 12 is opened, 10MPa is forced into core holding unit 9 by confining pressure pump 11,
Confined pressure control valve 12 is closed after pressurization；Temperature control equipment 7 is opened, after temperature rises to 120 DEG C, using constant-flux pump 2 to rock core
9 cavity circulation drilling fluid of clamper, to simulate the flow regime of drilling fluid in the wellbore, displacement pressure value 2MPa maintains 5min,
Shut-off valve 2 14 is opened, lost fluid is received with graduated cylinder 15, records the wastage in 5min.
4. gas pressure-bearing test experiments: after the completion of displacement blocks experiment, closing shut-off valve 1, pressure reducing valve 1, shut-off valve
2 14, gas outlet valve 20 is opened, confining pressure, temperature-resistant is kept, opens pressure reducing valve 17, passes through displacement pressure regulating valve 18 and adjusts
Solar term drive pressure (0~5MPa), and each gas drive pressure spot maintains 5min, record the pressure value of breakthrough of gas reservoir core plugging layer, lead to
The gas flow that gas flowmeter 21 is recorded in 5min is crossed, analysis experiment drilling fluid blocks microcrack effect.Experimental result
As shown in table 1 below.
The different drilling fluids of table 1 seam gas-stopping effect comparative experiments to single under same experiment condition
Embodiment 2
1. first configuration concentration is 2% bentonite slurry, 4 kinds of plugging materials, 100 mesh calcium carbonate superfine powders are then chosen, 400 mesh surpass
Thin calcium carbonate, micron order staple fiber, 400 mesh mica powders；It is prepared into four groups of experiment drilling fluids (specific formula is shown in Table 2) respectively,
For use.
2. building device: according to shown in Fig. 1, experimental facilities and pipeline being linked and packed, and check pipeline connection comprehensively
Whether place is completely embedded, and whether valve switch is normal, and whether pressure gauge reading is accurate.Choosing fracture aperture respectively is 50 μm, 300
μm single crack rock core as microcrack rock core 10.
By unscrewing the screw knob at 9 both ends of core holding unit, so that core holding unit 9 is opened, by the fine fisssure
Seam rock core 10 is put into the aid of the rock core in core holding unit 9 set 25, is fixed, is revolved with rock core plug 23, rock core plunger 24
The screw knob at upper both ends；Before experiment, prepared experiment drilling fluid is poured slowly into 1 in fluid reservoir.
3. displacement blocks experiment: confined pressure control valve 12 is opened, 10MPa is forced into core holding unit 9 by confining pressure pump 11,
Confined pressure control valve 12 is closed after pressurization；Temperature control equipment 7 is opened, after temperature rises to 120 DEG C, using constant-flux pump 2 to rock core
9 cavity circulation drilling fluid of clamper, displacement pressure value 0~8MPa, 1,3,5, maintain 10min under each displacement pressure of 8MPa, beat
Shut-off valve 2 14 is opened, by pipeline, lost fluid is received with graduated cylinder 15, records the wastage in 10min.
4. gas pressure-bearing test experiments: after the completion of displacement blocks experiment, closing shut-off valve 1, pressure reducing valve 1, shut-off valve
2 14, gas outlet valve 20 is opened, confining pressure, temperature-resistant is kept, opens pressure reducing valve 17, passes through displacement pressure regulating valve 18 and adjusts
Solar term drive 0~5MPa of pressure, and each gas drive pressure spot maintains 5min, record the pressure value of breakthrough of gas reservoir core plugging layer, pass through
Gas flowmeter 21 is recorded in the gas flow in 5min, and analysis drilling fluid blocks microcrack effect.Experimental result such as the following table 2
It is shown.
2 different experiments drilling fluid of table is to microcrack joint seal gas-stopping effect comparative experiments
It can be seen that closure from the experimental result of gas flow after the wastage, breakthrough of gas pressure, breakthrough of Tables 1 and 2
100 μm of rock cores of slit width, the joint seal gas-stopping effect of the super calcium of+2%100 mesh of 2% bentonite slurry are better than other plugging materials；And for
50 μm and 300 μm of microcrack is better than only 1 seed type by the plugging effect after the compounding of different types of plugging material
Plugging material joint seal gas-stopping effect.
It can be seen that joint seal gas shutoff experimental simulation device and test method energy of the invention from the experimental result of the present embodiment
The preferably joint seal gas-stopping effect of artificial ground evaluation experimental drilling fluid can be used for preferably matched with stratum microcrack
Plugging material.
Claims (10)
1. a kind of joint seal gas shutoff experimental simulation device, it is characterised in that: including microcrack rock core (10), microcrack blocks test system
System, gas pressure-bearing test macro；
It includes fluid reservoir (1), constant-flux pump (2), high pressure line (3), shut-off valve one (4), pressure that the microcrack, which blocks test macro,
Power table one (5), pressure reducing valve one (6), core holding unit (9), shut-off valve two (14), graduated cylinder (15)；
The core holding unit (9) includes circulation fluid entrance (27), circulation fluid outlet (28), filtrate (liquid (29), gas access
(30), gas vent (31), heating mantle (8), confining pressure entrance (22)；Confining pressure pumps (11) and confined pressure control valve (12) is housed by one section
It is connected with the pipeline of confining pressure table (13) with the confining pressure entrance (22) of core holding unit (9)；
The inlet of the constant-flux pump (2) is connected by pipe string with fluid reservoir (1)；The other end of the constant-flux pump (2) is logical
Cross circulation fluid entrance (27) phase of one section of high pressure line and core holding unit (9) equipped with shut-off valve one (4) and pressure gauge one (5)
Even；The circulation fluid outlet (28) of the core holding unit (9) passes through one section of pipeline and fluid reservoir (1) equipped with pressure reducing valve one (6)
It is connected；
The gas pressure-bearing test macro includes nitrogen cylinder (16), pressure reducing valve two (17), displacement pressure control valve (18), pressure gauge
Two (19), gas outlet valve (20), gas flowmeter (21)；
The nitrogen cylinder (16) is by one section equipped with pressure reducing valve two (17), displacement pressure control valve (18) and pressure gauge two (19)
Pipeline is connected with the gas access (30) of core holding unit (9)；
The gas flowmeter (21) connects the gas vent of the core holding unit (9) by gas outlet valve (20)
(31)。
2. a kind of joint seal gas shutoff experimental simulation device according to claim 1, it is characterised in that:
The core holding unit (9) further includes the rock core aid set (25) for placing rock core, and the rock core aid set (25) is anti-height
The rubber sleeve of temperature, for microcrack rock core (10) described in tight under the conditions of confining pressure；It can in the rock core aid set (25)
Fixed to be inserted into rock sample microcrack rock core (10) to be measured, rock core aid set (25) both ends are by rock core plunger (24), rock core plug (23)
It is fixed.
3. a kind of joint seal gas shutoff experimental simulation device according to claim 1, it is characterised in that:
The heating mantle (8) is the nickel-chromium resistance wire of wrapped with insulation, and the insulating materials is selected from glass fibre；The heating
Cover (8) connection temperature control equipment (7)；Outside is kept the temperature by insulation shell (26).
4. a kind of joint seal gas shutoff experimental simulation device according to claim 1, it is characterised in that:
The microcrack rock core (10) is the natural rock of diameter 2.5cm, the crack containing single of 3~6cm of length or double cracks
The heart or artificial core；The width in the crack is 20~500 μm.
5. described in any item a kind of test methods of joint seal gas shutoff experimental simulation device according to claim 1~4, feature
Be the following steps are included:
1) it builds device: the inlet of the constant-flux pump (2) is connected by pipe string with fluid reservoir (1)；The constant-flux pump
(2) liquid outlet passes through one section of high pressure line (3) equipped with shut-off valve one (4) and pressure gauge one (5) and core holding unit (9)
Circulation fluid entrance (27) is connected；The circulation fluid outlet (28) of the core holding unit (9) is equipped with pressure reducing valve one (6) by one section
Pipeline is connected with fluid reservoir (1)；The filtrate (liquid (29) of core holding unit (9) other end passes through shut-off valve two (14) and amount
Cylinder (15) is connected；
The confining pressure pump (11) passes through one section of pipeline and core holding unit (9) equipped with confined pressure control valve (12) and confining pressure table (13)
Confining pressure entrance (22) be connected；The temperature control equipment (7) connects heating mantle (8)；
The nitrogen cylinder (16) passes through one section of pipe equipped with pressure reducing valve (17), displacement pressure control valve (18) and pressure gauge two (19)
Line is connected with the gas access (30) of core holding unit (9)；
The gas flowmeter (21) connects the gas vent of the core holding unit (9) by gas outlet valve (20)
(31)；
By unscrewing the screw knob at core holding unit (9) both ends, the microcrack rock core (10) is put into rock core clamping
In device (9), fixed with rock core plug (23), rock core plunger (24), screw thread knob；
2) experiment drilling fluid is added: to the configured drilling fluid of addition in fluid reservoir (1)；
3) displacement blocks experiment: it opens confined pressure control valve (12), 10 are forced into core holding unit (9) by confining pressure pump (11)~
15MPa closes confined pressure control valve (12) after pressurization；The temperature that temperature control equipment (7) improve heating mantle (8) is opened, to temperature
After rising to experimental temperature, using constant-flux pump (2) to core holding unit (9) cavity circulation drilling fluid；By changing flow velocity, provide
Different displacement pressures, 0~8MPa of displacement pressure value maintain 5~10min under each displacement pressure, open shut-off valve two (14),
Lost fluid is received with graduated cylinder (15) by pipeline, records wastage；
4) after the completion of displacement blocks experiment, shut-off valve one (4), pressure reducing valve one (6), shut-off valve gas pressure-bearing test experiments: are closed
Two (14) are opened gas outlet valve (20), and confining pressure, temperature-resistant is kept, and are passed through displacement pressure control valve (18) and are adjusted gas drive
Pressure, each gas drive pressure spot maintain 1~30min, record the pressure value of breakthrough of gas reservoir core plugging layer, pass through gas flowmeter
(21) gas flow being recorded in each period, analysis drilling fluid block microcrack effect.
6. a kind of test method of joint seal gas shutoff experimental simulation device according to claim 5, it is characterised in that:
3) displacement blocks in experiment, and the rate of circulating flow of the circulating drilling fluid is 0.01~100.00mL/min.
7. a kind of test method of joint seal gas shutoff experimental simulation device according to claim 5, it is characterised in that:
3) displacement blocks in experiment, experimental temperature≤150 DEG C, preferably room temperature~120 DEG C.
8. a kind of test method of joint seal gas shutoff experimental simulation device according to claim 5, it is characterised in that:
3) displacement blocks in experiment, and the displacement pressure value is selected from 0.1,0.2,0.5,1.0,3.0,5.0,8.0MPa；Often
5~10min is maintained under a displacement pressure.
9. a kind of test method of joint seal gas shutoff experimental simulation device according to claim 5, it is characterised in that:
4) in the gas pressure-bearing test experiments, the gas drive pressure value be selected from 0.1,0.2,0.5,1.0,2.0,3.0,4.0,
5.0MPa；Each gas drive pressure spot maintains 1~30min.
10. a kind of test method of joint seal gas shutoff experimental simulation device according to claim 5, it is characterised in that including with
Lower step:
It is described build device step after the completion of, comprehensively check pipeline junction whether be completely embedded, whether valve switch normal, pressure
Whether power meter reading is accurate.
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| CN201710418704.4A CN109001438A (en) | 2017-06-06 | 2017-06-06 | A kind of joint seal gas shutoff experimental simulation device and test method |
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| CN201710418704.4A CN109001438A (en) | 2017-06-06 | 2017-06-06 | A kind of joint seal gas shutoff experimental simulation device and test method |
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