CN107656036A - A kind of HTHP dynamic joint seal gas-stopping effect evaluation experimental device and its evaluation method - Google Patents
A kind of HTHP dynamic joint seal gas-stopping effect evaluation experimental device and its evaluation method Download PDFInfo
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Abstract
The invention discloses a kind of HTHP dynamic joint seal gas-stopping effect evaluation experimental device, and it includes data processing section, core holding unit part, pressurized part, heating part, power section, gas cut source of the gas part and intermediate receptacle；It also discloses the evaluation method of HTHP dynamic joint seal gas-stopping effect.The beneficial effects of the invention are as follows：It is compact-sized, the degree of accuracy is high, for HTHP stratum gas cut process study provide experiment support.
Description
Technical field
The present invention relates to the simulation of gas cut process during oil and gas exploration and development and joint seal gas-stopping effect to evaluate
Technical field, particularly a kind of HTHP dynamic joint seal gas-stopping effect evaluation experimental device and its evaluation method.
Background technology
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 cause blowout so that drilling equipment is damaged, and jeopardizes the personal safety of drilling well staff, is destroyed
Oil-gas resource, pollution natural environment even result in Oil/gas Well and the serious consequence such as scrap, brought to petroleum industry serious
Negative social influences.It is to prevent the key of gas cut and safety drilling that relatively precisely can analytically go out gas cut process, but
Domestic laboratory apparatus related to this is less, and the laboratory apparatus for especially simulating gas cut process under high-temperature and high-pressure conditions is less.Specially
Profit " a kind of gas night displacement and joint seal gas shutoff experiment test device ", it mainly uses visual research method, studies normal temperature and pressure
Under gas night displacement phenomenon, although can be tested under the conditions of visual, to a certain extent have advance,
It is the gas cut process being unable under simulated formation high-temperature and high-pressure conditions, in addition this device can only study the gas cut under quiescent conditions
Process, gas cut process and plugging effect that can not be under the conditions of research trends, to the gas cut of research drilling HTHP stratum process
There is certain limitation with joint seal gas shutoff.Patent " joint seal gas shutoff evaluating apparatus " is more simple, and certain pressure is measured by graduated cylinder
Under wastage evaluation joint seal gas-stopping effect, can the process of gas cut be still not clear, and specially under high-temperature and high-pressure conditions
The experimental provision of assay dynamic joint seal gas-stopping effect is not yet found.
The content of the invention
The shortcomings that it is an object of the invention to overcome prior art, there is provided one kind is compact-sized, the degree of accuracy is high, it is high to be high temperature
The gas cut process study on pressure stratum provides the HTHP dynamic joint seal gas-stopping effect evaluation experimental device of experiment support and its commented
Valency method.
The purpose of the present invention is achieved through the following technical solutions：A kind of HTHP dynamic joint seal gas-stopping effect evaluation is real
Experiment device, it includes data processing section, core holding unit part, pressurized part, heating part, power section, gas cut source of the gas
Part and intermediate receptacle；
The rock core retained part includes the core holding unit A and core holding unit B for being arranged at intermediate receptacle left and right sides, in
Between intermediate receptacle pressurization hole is provided with the top of container, intermediate receptacle pressurization is connected with pressure sensor at hole, intermediate receptacle
Cavity A is offered in left and right sidewall, core holding unit A is symmetrical arranged with core holding unit B, core holding unit A include cylinder,
Plunger and rock core, the right part of cylinder are fixedly arranged on intermediate receptacle and connected with cavity A, and the left part of cylinder is provided with screw thread
Hole, screwed hole internal thread are connected with plunger, and rock core is arranged in cylinder and pressed between plunger and cylinder right part, rock core with
Formed with cavity B between plunger, be provided with multiple connection cavity B air admission holes in plunger, the outside of rock core covered with electrode film,
Soft electrode is inlaid with electrode film, soft electrode is attached in core outside surface, and the outside of electrode film is sequentially enclosed with gum cover and heat-insulated
Pad, formed with pressurization annular space between gum cover and electrode film, heater strip is provided between heat insulating mattress and gum cover；Set on the cylinder
There is the pressurization hole of connection pressurization annular space, heat lead and contact conductor are additionally provided with cylinder, heat lead is connected with heater strip,
Contact conductor is connected with soft electrode；
The pressurized part includes confined pressure pump A and confined pressure pump B, confined pressure pump A outlet end and core holding unit A pressurization hole
Connection, confined pressure pump B outlet end connect with core holding unit B pressurization hole；
The heating part includes adding for temperature controller A and temperature controller B, temperature controller A and core holding unit A
Hot lead connection, temperature controller B are connected with core holding unit B heat lead；
The gas cut source of the gas part includes nitrogen cylinder A and nitrogen cylinder B, the nitrogen cylinder A port of export and entering for core holding unit A
Gas flowmeter A is connected between stomata, gas is connected between the nitrogen cylinder B port of export and core holding unit B air admission hole
Flowmeter B；
The power section includes motor and nitrogen cylinder C, and motor is arranged at the lower section of intermediate receptacle, the output shaft extension of motor
Enter in intermediate receptacle and blade is installed on output shaft, the nitrogen cylinder C port of export is connected with intermediate receptacle pressurization hole；
The data processing section includes computer, data acquisition module, electric bridge instrument A and electric bridge instrument B, electric bridge instrument A and rock
Heart clamp holder A contact conductor connection, electric bridge instrument B are connected with core holding unit B contact conductor, computer and data acquisition module
Block connects, and electric bridge instrument, pressure sensor, temperature controller, confined pressure pump connect with motor via line.
The air admission hole is uniformly distributed in plunger.
The heat lead is respectively positioned on below pressurization hole with heater strip.
The bottom of the intermediate receptacle is provided with bolt plug.
Confined pressure pump is provided with pressure control knob and power switch.
Temperature controller is provided with temperature setting button and power switch.
The evaluation method of the experimental provision HTHP dynamic joint seal gas-stopping effect, it comprises the following steps：
S1, different slit width b man-made fracture rock core, intrinsic fracture rock core are individually placed to core holding unit A and rock core folder
In holder B, opening temperature controller and confined pressure pump, temperature controller makes heater strip generate heat, and heater strip heats to two rock cores, and
Confined pressure pump is pumped into hydraulic oil in the air to pressure rings, and hydraulic oil pressurizes to rock core, until temperature and pressure reaches formation at target locations
Temperature T and pressure P1；
S2, drilling fluid is poured into intermediate receptacle and opens motor, motor driven blade is rotated, and blade is carried out to drilling fluid
Stirring, simulates the situation of drilling well liquid movement in drilling process, while opens nitrogen cylinder A, nitrogen cylinder B and nitrogen cylinder C, from nitrogen cylinder
The nitrogen of output enters in man-made fracture rock core through gas flowmeter A, air admission hole in A, and the nitrogen of output passes through from nitrogen cylinder B
Gas flowmeter B, air admission hole enter in intrinsic fracture rock core, and the process in shaft bottom is flowed to simulate natural gas from stratum；From nitrogen
The nitrogen of bottle C outputs enters in intermediate receptacle through pressure sensor, intermediate receptacle pressurization hole, and part drilling fluid enters under stress
In man-made fracture rock core, and another part drilling fluid enters in intrinsic fracture rock core under stress, enters stratum to simulate liquid
Process, two simulation processes organically combine the gas cut process that can be simulated in drilling well；
S3, in the case of all parameter constants, different rotating speeds ω is realized by motor, soft electrode gathers rock core in real time
Resistivity, and resistivity is transmitted to data acquisition module, data acquisition module passes to computer again, obtains the rock under different ω
The resistivity R of the heartω, analyze and draw influence of the drilling speed to gas cut i.e. ω-RωCurve, according to ω-RωTracing analysis draw drilling speed with
The influence of joint seal gas-stopping effect and the optimum drilling rate ω under the conditions of thisc, similarly can be by obtaining ωc=when resistivity, analysis
Draw the joint seal gas-stopping effect under static conditions；
S4, in the case of all parameter constants, different fluid columns are realized by the displacement pressure P for increasing intermediate receptacle step by step
Joint seal gas shutoff process under pressure, obtain the P-R under the conditions of gas cut amountpRelation curve, analysis draw drilling fluid density ρ and joint seal
The relation of gas-stopping effect, while can be from P-RpPositive pressure-bearing value, the reduction when institute of resistivity R cliff of displacement formulas are obtained on relation curve
Corresponding pressure value PcAs positive maximum pressure-bearing value Pmax1, pass through Pc=Ph+PzObtain maximum density values ρmax=(Pc-Pz)/
(gH), ρmaxAs safety drilling when maximum drilling fluid density, wherein Pz be drilling when the pressure of the drill；
S5, in the case of all parameter constants, step by step increase two plungers air inflow Q and record corresponding pressure
Force value P, obtain Q-RbRelation curve, from Q-RbResistivity catastrophe point is found on relation curve, analysis obtains maximum gas cut amount Q, really
Determine pressure-bearing value P corresponding therewithh, the pressure-bearing value P at flex pointb, as maximum reverse pressure-bearing value Pmax, according to Pb=Ph+PzObtain
The minimum drilling fluid density ρ of joint seal gas shutoffmin=(Pb-Pz)/(gH),ρminMinimum safe density when as smoothly creeping into；
S6, the crack rock core for putting in two core holding unit A a slit width b=1.5mm, one is put in core holding unit B
The catastrophe point of individual slit width b=0.5mm crack rock core, under this condition repeat step S5 acquisition resistivity R, and flex point, analysis
Draw the ' Safe Density Windows of multiple cracking layer position；
S7, under nearly equilibrium condition, by reduce displacement pressure simulate gas cut after drilling fluid density change caused by pit shaft
Head of liquid change procedure, influence of the variable density to gas cut and joint seal gas shutoff gas-stopping effect caused by gas cut of analyzing and researching, its
Middle Δ ρ=Δ P/gh, △ P is the decreasing value of displacement pressure, and g is acceleration of gravity, and h is drilling fluid column height；
S8, the drilling fluid addition intermediate receptacle by different viscosities, drilling fluid is drawn by resistivity R analysis on change
Influence of the viscosity, mu to gas cut size and joint seal gas-stopping effect；
S9, pass through above relevant parameter：Maximum forward pressure-bearing value Pc, maximum reverse pressure-bearing value Pb, drilling fluid density window,
Optimum drilling rate ωcAcquisition with viscosity, mu is analyzed, and prepares optimization joint seal gas shutoff drilling fluid of good performance.
The present invention has advantages below：(1) experimental provision principle is reliable, simple to operate, can be with simulated formation HTHP
Under the conditions of gas cut process and dynamic joint seal gas shutoff technique.(2) device can determine two groups of analysis simultaneously under identical conditions
Experimental data, the uniformity of experiment condition is ensure that in certain scope.(3) electrode film in core holding unit and rock core are tight
Patch, the ω-R under different temperatures, different pressures can be determined by the electrode being embedded on electrode filmω、P1-RpAnd Q-RbRelation
Curve, obtain drilling fluid density, drilling fluid density changing value, drilling fluid viscosity, fracture width, pressure difference and drilling speed and gas cut and envelope
The relation between gas shutoff is stitched, whole process uses computer intelligence data collecting system, can obtain the experiment number of predetermined distance
According to, provide detailed data for the analysis of experimental results in later stage, at the same time, it is possible to prevente effectively from artificially read experimental data pair
Influenceed caused by experimental result, replacing gas cut for analysis underbalance gas cut, gas-liquid provides experimental method and laboratory apparatus.(4)
When carrying out the evaluation of joint seal gas-stopping effect, can realize while air inlet and feed liquor, the drilling fluid in intermediate receptacle is in displacement pressure
Effect is lower to realize joint seal gas shutoff process into core holding unit and then into rock core, and at the same time gas passes through in plunger both ends
Heart hole enters core holding unit and then enters rock core, the process of simulated formation gas cut, and gas cut and joint seal gas shutoff enter in the same time
OK, the process and actual condition high fit-carry out joint seal gas shutoff technique in the case where gas cut occurs, can be more accurate
Analysis joint seal gas shutoff technique.(5) whole experimental provision and dosage and granular size that experimental method is inorganic agent in drilling fluid
Ratio optimization provide reliably experiment support, for high gas-bearing reservoir drilling when required joint seal gas shutoff drilling fluid preparation carry
It is more accurate, efficient and reliable compared with conventional static, single evaluation for theoretical direction, blocked up for gas cut process and joint seal
Gas effect analysis evaluation provides experiment basis.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of rock core retained part；
Fig. 3 is Fig. 2 I portions partial enlarged view；
In figure, 1- intermediate receptacles, 2- core holding units A, 3- core holding unit B, 4- intermediate receptacle pressurization hole, 5- pressure biography
Sensor, 6- cavitys A, 7- cylinder, 8- plungers, 9- rock cores, 10- cavitys B, 11- air admission hole, 12- electrode films, 13- soft electrodes, 14-
Gum cover, 15- heat insulating mattress, 16- pressurization annular spaces, 17- heater strips, 18- pressurizations hole, 19- heat leads, 20- contact conductors, 21- enclose
Press pump A, 22- confined pressure pump B, 23- temperature controller A, 24- temperature controller B, 25- nitrogen cylinder A, 26- nitrogen cylinder B, 27- gas
Flowmeter A, 28- gas flowmeter B, 29- motor, 30- nitrogen cylinders C, 31- blade, 32- computers, 33- data acquisition modules,
34- electric bridge instrument A, 35- electric bridge instrument B.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings, and protection scope of the present invention is not limited to as described below：
As shown in Figures 1 to 3, a kind of HTHP dynamic joint seal gas-stopping effect evaluation experimental device, it includes data processing
Partly, core holding unit part, pressurized part, heating part, power section, gas cut source of the gas part and intermediate receptacle 1.
The rock core retained part includes the core holding unit A2 and core holding unit for being arranged at the left and right sides of intermediate receptacle 1
B3, the top of intermediate receptacle 1 are provided with intermediate receptacle pressurization hole 4, and intermediate receptacle pressurization is connected with pressure sensor 5 at hole 4, in
Between container 1 left and right sidewall on offer cavity A6, core holding unit A2 is symmetrical arranged with core holding unit B3, rock core clamping
Device A2 includes cylinder 7, plunger 8 and rock core 9, and the right part of cylinder 7 is fixedly arranged on intermediate receptacle 1 and connected with cavity A6, cylinder 7
Left part be provided with screwed hole, screwed hole internal thread is connected with plunger 8, and rock core 9 is arranged in cylinder 7 and presses on plunger 8
Between the right part of cylinder 7, formed with cavity B10 between rock core 9 and plunger 8, multiple connection cavity B10 are provided with plunger 8
Air admission hole 11, the outside of rock core 9 is inlaid with soft electrode 13, soft electrode 13 is attached to rock covered with electrode film 12 on electrode film 12
On the outer surface of the heart 9, the outside of electrode film 12 is sequentially enclosed with gum cover 14 and heat insulating mattress 15, is formed between gum cover 14 and electrode film 12
There is pressurization annular space 16, heater strip 17 is provided between heat insulating mattress 15 and gum cover 14；Connection pressurization annular space is provided with the cylinder 7
16 pressurization hole 18, heat lead 19 and contact conductor 20 are additionally provided with cylinder 7, heat lead 19 is connected with heater strip 17,
Contact conductor 20 is connected with soft electrode 13；The resistance that the soft electrode 13 can measure rock core different parts blocks up with gas cut and joint seal
The situation of change of gas process.The electrode film is mainly the attachment of soft electrode, for determining two interelectrode resistivity, is utilized
Dependency relation between physical quantity judges the distributing position of the relation and gas-liquid interface between gas-liquid two-phase, and then for analyzing envelope
Stitch gas-stopping effect and gas cut situation.The heat insulating mattress 15 is used to reduce the heat transfer between heater strip 17 and cylinder 7 and the external world.
The pressurized part includes confined pressure pump A21 and confined pressure pump B22, confined pressure pump A21 outlet end and core holding unit A2
Pressurization hole 18 connect, confined pressure pump B22 outlet end connects with core holding unit B3 pressurization hole 18.
The heating part includes temperature controller A23 and temperature controller B24, and temperature controller A23 clamps with rock core
Device A2 heat lead 19 is connected, and temperature controller B24 is connected with core holding unit B3 heat lead 19.
The gas cut source of the gas part includes nitrogen cylinder A25 and nitrogen cylinder B26, and nitrogen cylinder the A25 port of export and rock core clamp
Gas flowmeter A27, the nitrogen cylinder B26 port of export and core holding unit B3 air admission hole are connected between device A2 air admission hole 11
Gas flowmeter B28 is connected between 11.
The power section includes motor 29 and nitrogen cylinder C30, and motor 29 is arranged at the lower section of intermediate receptacle 1, motor 29
Output shaft be inserted into intermediate receptacle 1 and blade 31 be installed on output shaft, nitrogen cylinder the C30 port of export and intermediate receptacle add
Pressure hole 4 connects.
The data processing section includes computer 32, data acquisition module 33, electric bridge instrument A34 and electric bridge instrument B35, electric bridge
Instrument A34 is connected with core holding unit A2 contact conductor 20, and electric bridge instrument B35 is connected with core holding unit B3 contact conductor 20,
Computer 32 is connected with data acquisition module 33, electric bridge instrument, pressure sensor 5, temperature controller, confined pressure pump and the warp of motor 29
Road connects.
The air admission hole 11 is uniformly distributed in plunger 8.The heat lead 19 is respectively positioned on pressurization hole 18 with heater strip 17
Lower section.The bottom of the intermediate receptacle 1 is provided with bolt plug.Confined pressure pump is provided with pressure control knob and power switch.Temperature
Controller is provided with temperature setting button and power switch.
The evaluation method of the experimental provision HTHP dynamic joint seal gas-stopping effect, it comprises the following steps：
S1, different slit width b man-made fracture rock core, intrinsic fracture rock core are individually placed to core holding unit A2 and rock core folder
In holder B3, opening temperature controller and confined pressure pump, temperature controller makes heater strip 17 generate heat, and heater strip 17 adds to two rock cores
Heat, and confined pressure pump is pumped into hydraulic oil into pressurization annular space 16, hydraulic oil pressurizes to rock core, until temperature and pressure reaches mesh
Mark the temperature T and pressure P on stratum1；
S2, drilling fluid is poured into intermediate receptacle 1 and opens motor 29, motor 29 rotates with movable vane piece 31, and blade 31 is right
Drilling fluid is stirred, and simulates the situation of drilling well liquid movement in drilling process, while opens nitrogen cylinder A25, nitrogen cylinder B26 and nitrogen
Gas cylinder C30, the nitrogen of output enters in man-made fracture rock core through gas flowmeter A27, air admission hole 11 from nitrogen cylinder A25, and
The nitrogen of output enters in intrinsic fracture rock core through gas flowmeter B28, air admission hole 11 from nitrogen cylinder B26, natural to simulate
Gas flows to the process in shaft bottom from stratum；Enter from the nitrogen of nitrogen cylinder C30 outputs through pressure sensor 5, intermediate receptacle pressurization hole 4
In intermediate receptacle 1, part drilling fluid enters in man-made fracture rock core under stress, and another part drilling fluid enters under stress
In intrinsic fracture rock core, to simulate the process that liquid enters stratum, two simulation processes are organically combined and can simulated in drilling well
Gas cut process；
S3, in the case of all parameter constants, different rotating speeds ω is realized by motor 29, soft electrode 13 gathers rock in real time
The resistivity of the heart, and resistivity is transmitted to data acquisition module 33, data acquisition module 33 passes to computer again, obtains different
The resistivity R of rock core under ωω, analyze and draw influence of the drilling speed to gas cut i.e. ω-RωCurve, according to ω-RωTracing analysis obtains
Optimum drilling rate ω under the conditions of going out the influence of drilling speed and joint seal gas-stopping effect and being somebody's turn to doc, similarly can be by obtaining ωcElectricity when=0
Resistance rate, analysis draw the joint seal gas-stopping effect under static conditions；
S4, in the case of all parameter constants, by the displacement pressure P for increasing intermediate receptacle 1 step by step2Realize different liquid
Joint seal gas shutoff process under column pressure, obtain the P under the conditions of gas cut amount2-RpRelation curve, analysis draw drilling fluid density ρ and envelope
The relation of gas-stopping effect is stitched, while can be from P2-RpPositive pressure-bearing value is obtained on relation curve, during the reduction of resistivity R cliff of displacement formulas
Corresponding pressure value PcAs positive maximum pressure-bearing value Pmax1, pass through Pc=Ph+PzObtain maximum density values ρmax=(Pc-Pz)/
(gH), ρmaxAs safety drilling when maximum drilling fluid density, wherein Pz be drilling when the pressure of the drill；
S5, in the case of all parameter constants, step by step increase two plungers 8 air inflow Q and record corresponding
Pressure value P3, obtain Q-RbRelation curve, from Q-RbResistivity catastrophe point is found on relation curve, analysis obtains maximum gas cut amount
Q, it is determined that corresponding pressure-bearing value P therewithh, the pressure-bearing value P at flex pointb, as maximum reverse pressure-bearing value Pmax2, according to Pb=Ph+
PzObtain the minimum drilling fluid density ρ of joint seal gas shutoffmin=(Pb-Pz)/(gH),ρminMinimum safe when as smoothly creeping into is close
Degree；
S6, the crack rock core for putting in two core holding unit A2 a slit width b=1.5mm, put in core holding unit B3
The catastrophe point of one slit width b=0.5mm crack rock core, under this condition repeat step S5 acquisition resistivity R, and flex point, point
Analysis draws the ' Safe Density Windows of multiple cracking layer position；
S7, under nearly equilibrium condition, by reduce displacement pressure simulate gas cut after drilling fluid density change caused by pit shaft
Head of liquid change procedure, influence of the variable density to gas cut and joint seal gas shutoff gas-stopping effect caused by gas cut of analyzing and researching, its
Middle Δ ρ=Δ P/gh, △ P is the decreasing value of displacement pressure, and g is acceleration of gravity, and h is drilling fluid column height；
S8, the drilling fluid addition intermediate receptacle by different viscosities, drilling fluid is drawn by resistivity R analysis on change
Influence of the viscosity, mu to gas cut size and joint seal gas-stopping effect；
S9, pass through above relevant parameter：Maximum forward pressure-bearing value Pc, maximum reverse pressure-bearing value Pb, drilling fluid density window,
Optimum drilling rate ωcAcquisition with viscosity, mu is analyzed, and prepares optimization joint seal gas shutoff drilling fluid of good performance.Whole experimental provision
Reliably experiment support is provided for the dosage of inorganic agent in drilling fluid and the ratio optimization of granular size with experimental method, for height
The preparation of gas-bearing reservoir joint seal gas shutoff drilling fluid required when creeping into provides theoretical direction, with conventional static, single evaluation
Compared to more accurate, efficient and reliable, experiment basis are provided for gas cut process and joint seal gas-stopping effect assay.
Claims (7)
- A kind of 1. HTHP dynamic joint seal gas-stopping effect evaluation experimental device, it is characterised in that：It include data processing section, Core holding unit part, pressurized part, heating part, power section, gas cut source of the gas part and intermediate receptacle (1)；The rock core retained part includes the core holding unit A (2) and core holding unit B for being arranged at intermediate receptacle (1) left and right sides (3) intermediate receptacle pressurization hole (4), is provided with the top of intermediate receptacle (1), intermediate receptacle pressurization hole (4) place is connected with pressure biography Sensor (5), cavity A (6), core holding unit A (2) and core holding unit B are offered in the left and right sidewall of intermediate receptacle (1) (3) it is symmetrical arranged, core holding unit A (2) includes cylinder (7), plunger (8) and rock core (9), and the right part of cylinder (7) is fixedly arranged on Connected on intermediate receptacle (1) and with cavity A (6), the left part of cylinder (7) is provided with screwed hole, and screwed hole internal thread is connected with Plunger (8), rock core (9) are arranged in cylinder (7) and pressed between plunger (8) and cylinder (7) right part, rock core (9) and post Formed with cavity B (10), the interior air admission hole (11) for being provided with multiple connection cavity B (10) of plunger (8), rock core (9) between plug (8) Outside covered with electrode film (12), be inlaid with soft electrode (13) on electrode film (12), soft electrode (13) is attached to rock core (9) appearance On face, the outside of electrode film (12) is sequentially enclosed with gum cover (14) and heat insulating mattress (15), between gum cover (14) and electrode film (12) Formed with pressurization annular space (16), heater strip (17) is provided between heat insulating mattress (15) and gum cover (14)；Set on the cylinder (7) There is the pressurization hole (18) of connection pressurization annular space (16), be additionally provided with heat lead (19) and contact conductor (20) on cylinder (7), add Hot lead (19) is connected with heater strip (17), and contact conductor (20) is connected with soft electrode (13)；The pressurized part includes confined pressure pump A (21) and confined pressure pump B (22), confined pressure pump A (21) outlet end and core holding unit A (2) pressurization hole (18) connection, confined pressure pump B (22) outlet end connect with core holding unit B (3) pressurization hole (18)；The heating part includes temperature controller A (23) and temperature controller B (24), and temperature controller A (23) presss from both sides with rock core Holder A (2) heat lead (19) connection, temperature controller B (24) are connected with core holding unit B (3) heat lead (19)；The gas cut source of the gas part includes nitrogen cylinder A (25) and nitrogen cylinder B (26), and nitrogen cylinder A (25) port of export and rock core press from both sides Gas flowmeter A (27), nitrogen cylinder B (26) port of export and core holding unit are connected between holder A (2) air admission hole (11) Gas flowmeter B (28) is connected between B (3) air admission hole (11)；The power section includes motor (29) and nitrogen cylinder C (30), and motor (29) is arranged at the lower section of intermediate receptacle (1), electricity The output shaft of machine (29) is inserted into intermediate receptacle (1) and is provided with blade (31), nitrogen cylinder C (30) port of export on output shaft It is connected with intermediate receptacle pressurization hole (4)；The data processing section includes computer (32), data acquisition module (33), electric bridge instrument A (34) and electric bridge instrument B (35), Electric bridge instrument A (34) is connected with core holding unit A (2) contact conductor (20), electric bridge instrument B (35) and core holding unit B (3) electricity Pole lead (20) is connected, and computer (32) is connected with data acquisition module (33), electric bridge instrument, pressure sensor (5), temperature control Device, confined pressure pump connect with motor (29) via line.
- A kind of 2. HTHP dynamic joint seal gas-stopping effect evaluation experimental device according to claim 1, it is characterised in that： The air admission hole (11) is uniformly distributed in plunger (8).
- A kind of 3. HTHP dynamic joint seal gas-stopping effect evaluation experimental device according to claim 1, it is characterised in that： The heat lead (19) is respectively positioned on below pressurization hole (18) with heater strip (17).
- A kind of 4. HTHP dynamic joint seal gas-stopping effect evaluation experimental device according to claim 1, it is characterised in that： The bottom of the intermediate receptacle (1) is provided with bolt plug.
- A kind of 5. HTHP dynamic joint seal gas-stopping effect evaluation experimental device according to claim 1, it is characterised in that： Confined pressure pump is provided with pressure control knob and power switch.
- A kind of 6. HTHP dynamic joint seal gas-stopping effect evaluation experimental device according to claim 1, it is characterised in that： Temperature controller is provided with temperature setting button and power switch.
- 7. the evaluation side of experimental provision HTHP dynamic joint seal gas-stopping effect according to any one in claim 1~6 Method, it is characterised in that：It comprises the following steps：S1, different slit width b man-made fracture rock core, intrinsic fracture rock core are individually placed to core holding unit A (2) and rock core clamping In device B (3), temperature controller and confined pressure pump are opened, temperature controller makes heater strip (17) generate heat, and heater strip (17) is to two rocks The heart heats, and confined pressure pump is pumped into hydraulic oil into pressurization annular space (16), and hydraulic oil pressurizes to rock core, until temperature and pressure Reach the temperature T and pressure P of formation at target locations1；S2, drilling fluid is poured into intermediate receptacle (1) and opens motor (29), motor (29) band movable vane piece (31) rotates, blade (31) drilling fluid is stirred, simulates the situation of drilling well liquid movement in drilling process, while open nitrogen cylinder A (25), nitrogen Bottle B (26) and nitrogen cylinder C (30), the nitrogen of output enters through gas flowmeter A (27), air admission hole (11) from nitrogen cylinder A (25) Enter in man-made fracture rock core, and the nitrogen of output enters through gas flowmeter B (28), air admission hole (11) from nitrogen cylinder B (26) In intrinsic fracture rock core, the process in shaft bottom is flowed to simulate natural gas from stratum；From the nitrogen of nitrogen cylinder C (30) output through pressure Sensor (5), intermediate receptacle pressurization hole (4) enter in intermediate receptacle (1), and part drilling fluid enters man-made fracture rock under stress In the heart, and another part drilling fluid under stress enter intrinsic fracture rock core in, with simulate liquid enter stratum process, two Simulation process organically combines the gas cut process that can be simulated in drilling well；S3, in the case of all parameter constants, different rotating speeds ω is realized by motor (29), soft electrode (13) gathers rock in real time The resistivity of the heart, and resistivity is transmitted to data acquisition module (33), data acquisition module (33) passes to computer again, obtains The resistivity R of rock core under different ωω, analyze and draw influence of the drilling speed to gas cut i.e. ω-RωCurve, according to ω-RωCurve point Optimum drilling rate ω under the conditions of analysing the influence for drawing drilling speed and joint seal gas-stopping effect and being somebody's turn to doc, similarly can be by obtaining ωcWhen=0 Resistivity, analysis draws joint seal gas-stopping effect under static conditions；S4, in the case of all parameter constants, by the displacement pressure P for increasing intermediate receptacle (1) step by step2Realize different fluid columns Joint seal gas shutoff process under pressure, obtain the P under the conditions of gas cut amount2-RpRelation curve, analysis draw drilling fluid density ρ and joint seal The relation of gas-stopping effect, while can be from P2-RpPositive pressure-bearing value, the reduction when institute of resistivity R cliff of displacement formulas are obtained on relation curve Corresponding pressure value PcAs positive maximum pressure-bearing value Pmax1, pass through Pc=Ph+PzObtain maximum density values ρmax=(Pc-Pz)/ (gH), ρmaxAs safety drilling when maximum drilling fluid density, wherein Pz be drilling when the pressure of the drill；S5, in the case of all parameter constants, step by step increase two plungers (8) air inflow Q and record corresponding pressure Force value P3, obtain Q-RbRelation curve, from Q-RbResistivity catastrophe point is found on relation curve, analysis obtains maximum gas cut amount Q, It is determined that corresponding pressure-bearing value P therewithh, the pressure-bearing value P at flex pointb, as maximum reverse pressure-bearing value Pmax2, according to Pb=Ph+Pz Obtain the minimum drilling fluid density ρ of joint seal gas shutoffmin=(Pb-Pz)/(gH), ρminMinimum safe density when as smoothly creeping into；S6, the crack rock core for putting in two core holding unit A (2) a slit width b=1.5mm, core holding unit B are put in (3) The catastrophe point of one slit width b=0.5mm crack rock core, under this condition repeat step S5 acquisition resistivity R, and flex point, point Analysis draws the ' Safe Density Windows of multiple cracking layer position；S7, under nearly equilibrium condition, by reduce displacement pressure simulate gas cut after drilling fluid density change caused by pit shaft fluid column Pressure change process, influence of the variable density to gas cut and joint seal gas shutoff gas-stopping effect caused by gas cut of analyzing and researching, wherein Δ ρ =Δ P/gh, △ P are the decreasing value of displacement pressure, and g is acceleration of gravity, and h is drilling fluid column height；S8, the drilling fluid addition intermediate receptacle by different viscosities, drilling fluid viscosity is drawn by resistivity R analysis on change Influences of the μ to gas cut size and joint seal gas-stopping effect；S9, pass through above relevant parameter：Maximum forward pressure-bearing value Pc, maximum reverse pressure-bearing value Pb, it is drilling fluid density window, optimal Drilling speed ωcAcquisition with viscosity, mu is analyzed, and prepares optimization joint seal gas shutoff drilling fluid of good performance.
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| CN117147370B (en) * | 2023-10-31 | 2023-12-22 | 西南石油大学 | Method for quantitatively testing suitability of plugging material and drilling fluid |
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