CN108593533A - Simulate the experimental provision and experimental method of cementing concrete ring corrosion process in the earth formation - Google Patents
Simulate the experimental provision and experimental method of cementing concrete ring corrosion process in the earth formation Download PDFInfo
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- CN108593533A CN108593533A CN201810414485.7A CN201810414485A CN108593533A CN 108593533 A CN108593533 A CN 108593533A CN 201810414485 A CN201810414485 A CN 201810414485A CN 108593533 A CN108593533 A CN 108593533A
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Abstract
The present invention relates to the experimental provisions and experimental method of simulation cementing concrete ring corrosion process in the earth formation, it includes sealing cover, reaction vessel, the first constant current constant voltage pump, the second constant current constant voltage pump, experiment test specimen, experiment test specimen is set by cementing concrete ring set to be constituted outside casing, spiral screen pipe dish is wound in the annular space between cementing concrete ring and reaction vessel, the positioning protrusion of the centrally disposed cylinder of sealing cover inner face；There are inlet opening, spillway hole, valve opening, inlet opening to pump with the first constant current constant voltage and connect by high pressure channelizing line on sealing cover, pressure valve is installed at valve opening；Reaction container bottom has inlet opening, check valve is installed, inlet opening is pumped with the second constant current constant voltage and connect by high pressure channelizing line, and spiral screen casing upper end is closed inside inlet opening, spiral screen casing lower ending opening connects inlet opening, and several liquid separation holes are evenly distributed on spiral screen casing.The present invention can ensure that each ion concentration will not decay during corrosion experiment with the progress of experiment in water flooding.
Description
Technical field
The present invention relates to a kind of cementing concrete ring corrosion experiment technologies in the fields such as chemical attack, petroleum works, specifically
Relate to the experimental provision and experimental method of simulation cementing concrete ring corrosion process in the earth formation.
Background technology
Cementing concrete ring plays vital effect in oil/gas well production, and main purpose is protection production casing
The column oil adjacent with blocking, gas and water layer.Cementing concrete dress can be upwardly formed a waterpower packing in the vertical of whole mouth well after solidification
System, the system must can realize effective Inter-zonal packing during the entire oil/gas well service life and after scrapping.In recent years
With the development of Oil-Gas Well Engineering, the direction of exploration and development tends to deep-well, complicates, and is more easy to cause cement sheath seal failure,
It causes to seriously endanger to oil/gas well.Therefore, cement sheath sealing integrity is further furtherd investigate, to ensuring the safety open of oil/gas well
It adopts and has important practical significance.
Research thinks that oil/gas well is after production after a period of time, and seal failure has occurred in cement sheath, mainly at present
Because cement sheath is by caused by corrosiveness.Cement sheath corrosion refers to by CO2、H2Collaboration of the etchant gas such as S in water flooding
The mechanical property and related property of cement sheath caused by effect is lower change, such as strength reduction, and permeability increases etc..
However at present for the research of cement sheath etching problem just for cement sheath itself, there is no to casing cement sheath
The variation that cement plane occurs after being corroded is studied, and experimental facilities at this stage cannot achieve the underground residing for cement sheath
Environment.It can be seen that the experimental provision of corrosion process and experimental method have important application to a kind of simulation cementing concrete ring in the earth formation
Value.
There are following disadvantages for the corrosion experimental device of some cement sheaths at present：First, casing cement sheath glue can not be determined
The corrosion condition of junction, second is that declining at any time since the closing in corrosion experiment space results in each ion concentration in water flooding
Subtract, the result that experiment obtains is made to lack persuasion.
Invention content
The object of the present invention is to provide the experimental provision of simulation cementing concrete ring corrosion process in the earth formation, this simulation is solid
The experimental provision of well cement ring corrosion process in the earth formation can more accurately simulate actual formation condition, make researcher couple
Cementing concrete ring and casing cement sheath cement plane are by CO2、H2The caused corruption under the synergistic effect of water flooding of the etchant gas such as S
Losing Study on Problems can be further, to solve the problems, such as the cement sheath seal failure of oil/gas well, another object of the present invention
It is to provide the experimental method of the simulation cementing concrete ring experimental provision of corrosion process in the earth formation.
The technical solution adopted by the present invention to solve the technical problems is：This simulation cementing concrete ring corrodes in the earth formation
The experimental provision of process includes sealing cover, reaction vessel, the first constant current constant voltage pump, the second constant current constant voltage pump, spiral screen casing, experiment
Test specimen, experiment test specimen is set by cementing concrete ring set to be constituted outside casing, and experiment test specimen is placed in reaction vessel interior base, spiral
Screen casing is coiled in the annular space between cementing concrete ring and reaction vessel, and sealing cover inner face is centrally disposed cylindrical to be determined
Position protrusion, sealing cover lid are fixedly connected by fixing bolt on the reaction vessel, and positioning protrusion snaps into casing, sealing cover and reality
Test specimen is tested to seal by anticorrosion gasket；There are inlet opening, spillway hole, valve opening, inlet opening and the first constant current constant voltage on sealing cover
Pump is connected by high pressure channelizing line, and pressure valve is equipped at valve opening, sealing bolt is equipped on spillway hole；Reaction container bottom has
Inlet opening is equipped with check valve inside inlet opening, and inlet opening is pumped with the second constant current constant voltage and connect by high pressure channelizing line, spiral screen
Pipe upper end is closed, and spiral screen casing lower ending opening connects inlet opening, is evenly distributed with several liquid separation holes on spiral screen casing, each
Liquid separation inlays sieve at hole.
Inlet opening is located at the circle centre position of sealing cover in said program, and distance of the spillway hole apart from the center of circle is less than the half of casing
Diameter；Valve opening is located on the outside of spillway hole.
Cup dolly is arranged in reaction container bottom in said program, and cup dolly has a groove, groove be located at inlet opening and
Between bottom edge, the high pressure channelizing line of the second constant current constant voltage pump connection is placed in groove, and high pressure channelizing line is prevented to be used for a long time
After be pressed down.
60 liquid separation holes, the screw pitch 160mm of spiral screen casing, the number of turns 3 are uniformly distributed in said program on spiral screen casing.
Reaction vessel and sealing cover are all made of high rigidity steel in said program.
The experimental method of the above-mentioned simulation cementing concrete ring experimental provision of corrosion process in the earth formation：
A. first experiment test specimen is put on the pedestal in reaction vessel, spiral screen casing lower ending opening is connect with inlet opening；It will be close
On the reaction vessel, anticorrosion gasket is pressed on above experiment test specimen, and tightens fastening bolt, and sealing is covered tightly for capping installation
Gu on the reaction vessel；
B. injection fine sand and the water flooding modulated in the annular space between experiment test specimen and reaction vessel, and water flooding is made to reach
To fully saturated state；
C. the sealing bolt for dismantling lower spillway hole, is pumped using the first constant current constant voltage and is passed through distilled water to inlet opening, until spillway hole
There is water spilling at place, then closes spillway hole with sealing bolt, and adjustment the first constant current constant voltage pump provides required pressure for experiment；
D., second constant current constant voltage pump pressure is set, is injected needed for the water flooding configured and experiment by inlet opening with constant flow rate
Gas, the water flooding configured and experiment needed for gas through on spiral screen casing liquid separation hole flow out, with pressure valve coordinate with
Maintain the strata pressure needed for gas concentration and experiment；
E. the experimental provision that will finally simulate cementing concrete ring corrosion process in the earth formation, which is put into insulating box, waits for experiment to terminate,
Analyze experimental result.
The invention has the advantages that：
1, the sealing cover in the present invention can ensure that test test specimen holds in reaction due to having cylindrical positioning protrusion in inner face
Centralizer in device.
2, the sealing cover in the present invention being capable of sealing experiment test specimen and close due to being equipped with anticorrosion gasket in inner face
The contact surface of capping.
3, experimental provision of the invention is due to devising inlet opening, spiral screen casing and pressure valve, so as to ensure ground
Each ion concentration will not decay during corrosion experiment with the progress of experiment in layer water.
4, the stratum for being filled with fine sand in the annular space in the present invention between experiment test specimen and reaction vessel and having configured
Water can more preferably simulate the pore pressure in actual formation.
Description of the drawings
Fig. 1 is the overall schematic of this experimental provision.
Fig. 2 is the stereogram of experiment test specimen needed for this experimental provision.
Fig. 3 is the stereogram of reaction vessel in this experimental provision.
Fig. 4 is the front view of reaction vessel in this experimental provision.
Fig. 5 is the front view of sealing cover in this experimental provision.
Fig. 6 is the vertical view of sealing cover in this experimental provision.
In figure：1 sealing cover, 2 reaction vessels, 3 first constant current constant voltages pump, 4 spiral screen casings, 5 inlet openings, 6 spillway holes, 7 valves
Hole, 8 inlet openings, 9 pressure valves, 10 second constant current constant voltages pump, 11 fixing bolts, 12 sealing bolts, 13 anticorrosion gaskets, 14
Casing, 15 cementing concrete rings, 16 positioning protrusion.
Specific implementation mode
The present invention will be further described below with reference to the drawings：
Hold as shown in Figure 1, the experimental provision of this simulation cementing concrete ring corrosion process in the earth formation includes sealing cover 1, reaction
Device 2, the first constant current constant voltage pump the 3, second constant current constant voltage pump 10, experiment test specimen, spiral screen casing 4, have inlet opening 5 on sealing cover 1, overflow
Water hole 6, valve opening 7, experiment test specimen are placed in 2 interior base of reaction vessel, and spiral screen casing 4 is coiled in cementing concrete ring 15 and reacts
In annular space between container 2, the positioning protrusion 16 of the centrally disposed cylinder of 1 inner face of sealing cover, sealing cover 1, which covers, to react
It is fixedly connected by fixing bolt 11 on container 2, positioning protrusion 16 snaps into casing 14, and the purpose is to ensure test specimen relative response
Container 2 is placed in the middle, and 1 inner face of sealing cover is equipped with anticorrosion gasket 13, and sealing cover 1 passes through anticorrosion gasket 13 with experiment test specimen
Test specimen is first put into reaction vessel 2 by sealing, when experiment, and test specimen and reaction vessel 2 are filled with fine sand and water flooding configure
Between annular space, then sealing cover 1 is mounted on reaction vessel 2, and is bolted on；Inlet opening 5 and the first constant current constant voltage
Pump 3 is connected by high pressure channelizing line, and pressure valve 9 is equipped on valve opening 7, sealing bolt 12 is equipped on spillway hole 6；Reaction vessel
Inlet opening 8 is arranged at 2 bottoms, and check valve is equipped with inside inlet opening 8, and inlet opening 8 and the second constant current constant voltage pump 10 pass through high pressure water conservancy diversion
Line connects, and cup dolly is arranged in 2 bottom of reaction vessel, and cup dolly has a groove, groove be located at inlet opening 8 and bottom edge it
Between, the second constant current constant voltage pumps 10 pipe high pressure channelizing lines 10 and is placed in groove, is pressed down after preventing high pressure channelizing line to be used for a long time.
Referring to Fig.2, experiment test specimen is made of casing 14 and 15 two parts of cementing concrete ring.
In conjunction with shown in Fig. 3 and Fig. 4, reaction vessel 2 includes spiral screen casing 4, inlet opening 8.Inlet opening 8 is located at reaction vessel 2
Bottom surface far from center of circle 115mm at, be connected with each other with internal spiral screen casing 4, and an individual event valve is installed inside inlet opening 8,
Prevent the fine sand that fluid reflux and reflux carry from entering constant pressure and flow pump.The screw pitch 160mm of spiral screen casing 4, the number of turns 3, spiral shell
The length for revolving screen casing 4 is 820mm, is uniformly distributed 60 liquid separation holes on spiral screen casing 4, and inlay at each liquid separation hole sieve with
Prevent fine sand from entering screen casing.Spiral screen casing 4 ensure that concentration of each ion during corrosion experiment in water flooding.
In conjunction with shown in Fig. 5 and Fig. 6, sealing cover 1 includes inlet opening 5, spillway hole 6, valve opening 7, and inlet opening 5 is located at sealing cover 1
Circle centre position, 3 be connected with the first constant current constant voltage pump.Spillway hole 6 is located at away from center of circle 40mm, is equipped with dismountable sealing bolt
12, when being passed through distilled water, lower sealing bolt 12 is dismantled, observes whether water overflows by spillway hole 6.Valve opening 7 is located at away from the center of circle
At 115mm, pressure valve 9 is connected.Anticorrosion gasket 13 is located at the inner face of sealing cover 1, internal-and external diameter be respectively 127.3mm and
215.9mm.（Size can modify according to different sample dimensions, this specification is 127.3mm with internal diameter, wall thickness 6.2mm's
For casing and the cement sheath that outer diameter is 215.9mm）.
Reaction vessel 2 and sealing cover 1 are all made of high rigidity steel and are made in the present invention, ensure that it is unlikely to deform.
It is 127.3mm with internal diameter, it is of the invention for the cement sheath that the casing 14 and outer diameter of wall thickness 6.2mm are 215.9mm
Experimental method is as follows：
A. first experiment test specimen is put on the pedestal in reaction vessel 2,4 lower ending opening of spiral screen casing is connect with inlet opening 8；It will
Sealing cover 1 is mounted on reaction vessel 2, and anticorrosion gasket 13 is pressed on above experiment test specimen, and tightens fastening bolt, will be close
Capping 1 is fastened on reaction vessel 2；
B. injection fine sand and the water flooding modulated in the annular space between experiment test specimen and reaction vessel 2, and make water flooding
Reach fully saturated state；
C. the sealing bolt 12 for dismantling lower spillway hole 6 is passed through distilled water, until overflowing using the first constant current constant voltage pump 3 to inlet opening 5
There is water spilling at water hole 6, then spillway hole 6 is closed with sealing bolt 12, the first constant current constant voltage of adjustment pump 3 provides required pressure for experiment
Power；
D., second constant current constant voltage is set and pumps 10 pressure, the water flooding configured and experiment are injected by inlet opening 8 with constant flow rate
Gas needed for required gas, the water flooding configured and experiment is flowed out through the liquid separation hole on spiral screen casing 4, passes through pressure valve
9 cooperations are to maintain the strata pressure needed for gas concentration and experiment；
E. finally the experimental provision for simulating the corrosion process in the earth formation of cementing concrete ring 15 is put into insulating box, it is pre- according to experiment
Waiting experiment of fixing time terminates, and analyzes experimental result.
Claims (6)
1. a kind of experimental provision of simulation cementing concrete ring corrosion process in the earth formation, it is characterised in that：This simulation well cementation water
Mud ring（15）The experimental provision of corrosion process includes sealing cover in the earth formation（1）, reaction vessel（2）, the first constant current constant voltage pump
（3）, the second constant current constant voltage pump（10）, spiral screen casing（4）, experiment test specimen, experiment test specimen by cementing concrete ring（15）It is nested with and is covering
Pipe（14）Outer composition, experiment test specimen are placed on reaction vessel（2）In interior base, spiral screen casing（4）It is coiled in cementing concrete ring
（15）With reaction vessel（2）Between annular space in, sealing cover（1）The positioning protrusion of the centrally disposed cylinder of inner face
（16）, sealing cover（1）It covers in reaction vessel（2）On pass through fixing bolt（11）It is fixedly connected, positioning protrusion（16）Snap into casing
（14）It is interior, sealing cover（1）Pass through anticorrosion gasket with experiment test specimen（13）Sealing；Sealing cover（1）On have inlet opening（5）, overflow
Water hole（6）, valve opening（7）, inlet opening（5）It is pumped with the first constant current constant voltage（3）It is connected by high pressure channelizing line, valve opening（7）Place's installation
There is pressure valve（9）, spillway hole（6）On sealing bolt is installed（12）；Reaction vessel（2）Inlet opening is arranged at bottom（8）, inlet opening
（8）Inside is equipped with check valve, inlet opening（8）It is pumped with the second constant current constant voltage（10）It is connected by high pressure channelizing line, spiral screen casing
（4）Upper end is closed, spiral screen casing（4）Lower ending opening connects inlet opening（8）, spiral screen casing（4）On be evenly distributed with it is several
Sieve is inlayed at each liquid separation hole in liquid separation hole.
2. simulation cementing concrete ring according to claim 1（15）The experimental provision of corrosion process in the earth formation, feature
It is：The inlet opening（5）Positioned at sealing cover（1）Circle centre position, spillway hole（6）Distance apart from the center of circle is less than the half of casing
Diameter；Valve opening（7）Positioned at spillway hole（6）Outside.
3. simulation cementing concrete ring according to claim 2（15）The experimental provision of corrosion process in the earth formation, feature
It is：The reaction vessel（2）Cup dolly is arranged in bottom, and cup dolly has a groove, groove to be located at inlet opening（8）The bottom of with
Between portion edge, the second constant current constant voltage pump（10）The high pressure channelizing line of connection is placed in groove.
4. simulation cementing concrete ring according to claim 3（15）The experimental provision of corrosion process in the earth formation, feature
It is：The spiral screen casing（4）On be uniformly distributed 0 liquid separation hole, spiral screen casing（4）Screw pitch 160mm, the number of turns 3.
5. simulation cementing concrete ring according to claim 4（15）The experimental provision of corrosion process in the earth formation, feature
It is：The reaction vessel（2）And sealing cover（1）All it is made of high rigidity steel.
6. the simulation cementing concrete ring described in a kind of claims 1 or 2 or 3 or 4 or 5（15）Corrosion process in the earth formation
Experimental provision experimental method, it is characterised in that：
A. first experiment test specimen is put into reaction vessel（2）Pedestal on, by spiral screen casing（4）Lower ending opening and inlet opening（8）
Connection；By sealing cover（1）Mounted on reaction vessel（2）On, anticorrosion gasket（13）It is pressed on above experiment test specimen, and tightens
Fastening bolt, by sealing cover（1）It is fastened on reaction vessel（2）On；
B. between experiment test specimen and reaction vessel（2）Annular space in injection fine sand and the water flooding that modulates, and make stratum
Water reaches fully saturated state；
C. lower spillway hole is dismantled（6）Sealing bolt（12）, pumped using the first constant current constant voltage（3）To inlet opening（5）It is passed through distillation
Water, until spillway hole（6）There is water spilling at place, then uses sealing bolt（12）Close spillway hole（6）, adjustment the first constant current constant voltage pump
（3）Required pressure is provided for experiment；
D., second constant current constant voltage pump is set（10）Pressure passes through inlet opening with constant flow rate（8）Inject the water flooding that configure with
Gas needed for gas needed for experiment, the water flooding configured and experiment is through spiral screen casing（4）On liquid separation hole outflow, with control
Pressure valve（9）Cooperation is to maintain the strata pressure needed for gas concentration and experiment；
E. cementing concrete ring will finally be simulated（15）The experimental provision of corrosion process, which is put into insulating box, in the earth formation waits for experiment
Terminate, analyzes experimental result.
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| CN201810414485.7A CN108593533B (en) | 2018-05-03 | 2018-05-03 | Simulate the experimental provision and experimental method of cementing concrete ring corrosion process in the earth formation |
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| CN108593533A true CN108593533A (en) | 2018-09-28 |
| CN108593533B CN108593533B (en) | 2019-03-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112832742A (en) * | 2021-01-15 | 2021-05-25 | 西南石油大学 | Well cementation displacement interface simulation experiment device and using method thereof |
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| CN112832742A (en) * | 2021-01-15 | 2021-05-25 | 西南石油大学 | Well cementation displacement interface simulation experiment device and using method thereof |
| CN112832742B (en) * | 2021-01-15 | 2022-04-22 | 西南石油大学 | Well cementation displacement interface simulation experiment device and using method thereof |
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| CN108593533B (en) | 2019-03-08 |
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