CN108593533B - 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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- CN108593533B CN108593533B CN201810414485.7A CN201810414485A CN108593533B CN 108593533 B CN108593533 B CN 108593533B CN 201810414485 A CN201810414485 A CN 201810414485A CN 108593533 B CN108593533 B CN 108593533B
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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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 cylindrical positioning protrusion of sealing cover inner face center setting；There are inlet opening, spillway hole, valve opening on sealing cover, inlet opening pumps with the first constant current constant voltage and connect by high pressure channelizing line, and pressure valve is equipped 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, is evenly distributed with several liquid separation holes on spiral screen casing.The present invention can guarantee 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 one of fields such as chemical attack, petroleum works cementing concrete ring corrosion experiment technologies, specifically
Relate to the experimental provision and experimental method of simulation cementing concrete ring corrosion process in the earth formation.
Background technique
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 easier 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 the safety open for ensuring 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 underground locating for cement sheath
Environment.It can be seen that the experimental provision of corrosion process and experimental method have important application a kind of simulation cementing concrete ring in the earth formation
Value.
There are following disadvantages for the corrosion experimental device of current some cement sheaths: first is that 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 for obtaining experiment lacks persuasion.
Summary of the invention
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 be more accurate simulation 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 the setting of sealing cover inner face center is 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, is equipped with sealing bolt 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, spiral screen casing lower ending opening connection 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 center point of sealing cover in above scheme, 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 above scheme, 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 are uniformly distributed in above scheme on spiral screen casing, circle number is 3.
Reaction vessel and sealing cover all use high rigidity steel to be made in above scheme.
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；
On the reaction vessel by sealing cover installation, anticorrosion gasket is pressed on above experiment test specimen, and tightens fastening bolt, will be sealed
It covers tightly admittedly on the reaction vessel；
B. the water flooding injecting fine sand in the annular space between experiment test specimen and reaction vessel and modulating, and make stratum
Water reaches 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 overflowing
There is water spilling at water hole, then close spillway hole with sealing bolt, adjustment the first constant current constant voltage pump provides required pressure for experiment；
D., second constant current constant voltage pump pressure is set, configured water flooding and experiment are injected by inlet opening with constant flow rate
Gas needed for required gas, configured water flooding and experiment is flowed out through the liquid separation hole on spiral screen casing, is matched with pressure valve
It closes to maintain gas concentration and test required strata pressure；
E. finally the experimental provision for simulating cementing concrete ring corrosion process in the earth formation is put into insulating box and waits experiment
Terminate, analyzes experimental result.
The invention has the following advantages:
1, the sealing cover in the present invention can guarantee to test test specimen anti-due to having cylindrical positioning protrusion in inner face
Answer the centralizer in container.
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 guarantee ground
Each ion concentration will not decay during corrosion experiment with the progress of experiment in layer water.
4, fine sand and configured stratum are filled in the annular space in the present invention between experiment test specimen and reaction vessel
Water can more preferably simulate the pore pressure in actual formation.
Detailed description of the invention
Fig. 1 is the overall schematic of this experimental provision.
Fig. 2 is the perspective view of experiment test specimen needed for this experimental provision.
Fig. 3 is the perspective view 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 top 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 embodiment
The present invention will be further described below with reference to the drawings:
As shown in Figure 1, the experimental provision of this simulation cementing concrete ring corrosion process in the earth formation include sealing cover 1, it is anti-
It answers container 2, the first constant current constant voltage to pump the 3, second constant current constant voltage pump 10, experiment test specimen, spiral screen casing 4, has inlet opening on sealing cover 1
5, spillway hole 6, valve opening 7, experiment test specimen be placed in 2 interior base of reaction vessel, spiral screen casing 4 be coiled in cementing concrete ring 15 with
In annular space between reaction vessel 2, the cylindrical positioning protrusion 16 of 1 inner face center of sealing cover setting, sealing cover 1 is covered
It is fixedly connected on reaction vessel 2 by fixing bolt 11, positioning protrusion 16 snaps into casing 14, and the purpose is to guarantee that test specimen is opposite
Reaction vessel 2 is placed in the middle, and 1 inner face of sealing cover is equipped with anticorrosion gasket 13, and sealing cover 1 and experiment test specimen are sealed by anticorrosion
Pad 13 seals, and test specimen is first put into reaction vessel 2 by when experiment, with fine sand and configured water flooding filling test specimen with react appearance
Then sealing cover 1 is mounted on reaction vessel 2, and bolts on by the annular space between device 2；Inlet opening 5 and the first constant current are permanent
Press 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 is held
Inlet opening 8 is arranged at 2 bottom of device, and check valve is equipped with inside inlet opening 8, and inlet opening 8 is led with the second constant current constant voltage pump 10 by high pressure
Cup dolly is arranged in streamline connection, 2 bottom of reaction vessel, and cup dolly has a groove, and groove is located at inlet opening 8 and bottom edge
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,
The fine sand for preventing fluid reflux and reflux from carrying enters constant pressure and flow pump.The screw pitch 160mm of spiral screen casing 4, circle number are 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
The center point, 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 the cement sheath that casing and outer diameter are 215.9mm).
Reaction vessel 2 and sealing cover 1 are all made of high rigidity steel and are made in the present invention, guarantee that it is unlikely to deform.
It is 127.3mm with internal diameter, it is of the invention for the casing 14 and outer diameter of wall thickness 6.2mm is the cement sheath of 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 connected with inlet opening 8
It connects；Sealing cover 1 is mounted on reaction vessel 2, anticorrosion gasket 13 is pressed on above experiment test specimen, and tightens fastening spiral shell
Sealing cover 1 is fastened on reaction vessel 2 by bolt；
B. the water flooding injecting fine sand in the annular space between experiment test specimen and reaction vessel 2 and modulating, and make ground
Layer water reaches fully saturated state；
C. the sealing bolt 12 for dismantling lower spillway hole 6 is passed through distilled water to inlet opening 5 using the first constant current constant voltage pump 3, directly
There is water spilling to spillway hole 6, then close spillway hole 6 with sealing bolt 12, the first constant current constant voltage of adjustment pump 3 provides institute for experiment
Need pressure；
D. be arranged the second constant current constant voltage pump 10 pressure, with constant flow rate by inlet opening 8 inject configured water flooding and
Gas needed for gas needed for experiment, configured water flooding and experiment is flowed out through the liquid separation hole on spiral screen casing 4, passes through control
The cooperation of pressure valve 9 is to maintain gas concentration and test required strata pressure；
E. finally the experimental provision for simulating the corrosion process in the earth formation of cementing concrete ring 15 is put into insulating box, according to reality
Testing predetermined time waiting experiment 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
The experimental provision of mud ring corrosion process in the earth formation includes sealing cover (1), reaction vessel (2), the first constant current constant voltage pump (3), the
Two constant current constant voltages pump (10), spiral screen casing (4), experiment test specimen, and experiment test specimen is nested with by cementing concrete ring (15) in casing (14)
Outer composition, experiment test specimen are placed in reaction vessel (2) interior base, and spiral screen casing (4) is coiled in cementing concrete ring (15) and anti-
It answers in the annular space between container (2), the cylindrical positioning protrusion (16) of sealing cover (1) inner face center setting, sealing cover
(1) it covers and is fixedly connected on reaction vessel (2) by fixing bolt (11), positioning protrusion (16) snaps into casing (14), sealing
It covers (1) and experiment test specimen is sealed by anticorrosion gasket (13)；There are inlet opening (5), spillway hole (6), valve opening on sealing cover (1)
(7), inlet opening (5) are connect with the first constant current constant voltage pump (3) by high pressure channelizing line, and pressure valve (9) are equipped at valve opening (7),
Sealing bolt (12) are installed on spillway hole (6)；Reaction vessel (2) bottom has inlet opening (8), is equipped with inside inlet opening (8)
Check valve, inlet opening (8) are connect with the second constant current constant voltage pump (10) by high pressure channelizing line, and spiral screen casing (4) upper end is closing
, spiral screen casing (4) lower ending opening connects inlet opening (8), is evenly distributed with several liquid separation holes, Mei Gefen on spiral screen casing (4)
Sieve is inlayed at fluid apertures.
2. the experimental provision of simulation cementing concrete ring corrosion process in the earth formation according to claim 1, it is characterised in that:
The inlet opening (5) is located at the center point of sealing cover (1), and distance of the spillway hole (6) apart from the center of circle is less than the radius of casing；Valve
Hole (7) is located on the outside of spillway hole (6).
3. the experimental provision of simulation cementing concrete ring corrosion process in the earth formation according to claim 2, it is characterised in that:
Cup dolly is arranged in reaction vessel (2) bottom, and cup dolly has a groove, and groove is located at inlet opening (8) and bottom sides
Between, the high pressure channelizing line of the second constant current constant voltage pump (10) connection is placed in groove.
4. the experimental provision of simulation cementing concrete ring corrosion process in the earth formation according to claim 3, it is characterised in that:
60 liquid separation holes, the screw pitch 160mm of spiral screen casing (4) are uniformly distributed on the spiral screen casing (4), circle number is 3.
5. the experimental provision of simulation cementing concrete ring corrosion process in the earth formation according to claim 4, it is characterised in that:
The reaction vessel (2) and sealing cover (1) is all made of high rigidity steel.
6. the experimental provision of simulation cementing concrete ring corrosion process in the earth formation described in a kind of claims 1 or 2 or 3 or 4 or 5
Experimental method, it is characterised in that:
A. first experiment test specimen is put on the pedestal in reaction vessel (2), by spiral screen casing (4) lower ending opening and inlet opening
(8) it connects；Sealing cover (1) is mounted on reaction vessel (2), anticorrosion gasket (13) is pressed on above experiment test specimen, and
Fastening bolt is tightened, sealing cover (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 ground
Layer water reaches fully saturated state；
C. the sealing bolt (12) for dismantling lower spillway hole (6) is passed through distillation to inlet opening (5) using the first constant current constant voltage pump (3)
Water until there is water spilling at spillway hole (6), then closes spillway hole (6) with sealing bolt (12), adjustment the first constant current constant voltage pump
(3) required pressure is provided for experiment；
D., second constant current constant voltage pump (10) pressure is set, with constant flow rate by inlet opening (8) inject configured water flooding and
Gas needed for gas needed for experiment, configured water flooding and experiment is flowed out through the liquid separation hole on spiral screen casing (4), with control
Pressure valve (9) cooperation is to maintain gas concentration and test required strata pressure；
E. finally the experimental provision for simulating cementing concrete ring (15) corrosion process in the earth formation is put into insulating box and waits experiment
Terminate, analyzes experimental result.
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| CN108593533B true CN108593533B (en) | 2019-03-08 |
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| 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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| CN104153760A (en) * | 2014-07-22 | 2014-11-19 | 中国石油大学(华东) | Oil-gas well cement sheath seal characteristic simulation test device and test method |
| CN206707694U (en) * | 2017-05-18 | 2017-12-05 | 西南石油大学 | Hydrate formation primary cement evaluation experimental provision in a kind of deep water cementing |
| JP2018063176A (en) * | 2016-10-13 | 2018-04-19 | 国立研究開発法人物質・材料研究機構 | Rebar corrosion promotion test method and test equipment used for the same |
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2018
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1699962A (en) * | 2005-06-17 | 2005-11-23 | 哈尔滨工业大学 | Rainwash protection simulation experiment apparatus |
| CN102830057A (en) * | 2012-09-10 | 2012-12-19 | 西南石油大学 | Evaluating method for corrosion of well-reinforcing cement stone |
| CN102979505A (en) * | 2012-12-06 | 2013-03-20 | 中国海洋石油总公司 | Well cementation cement sheath performance simulation experiment device and experiment method |
| CN103398937A (en) * | 2013-07-22 | 2013-11-20 | 西南石油大学 | Underground set cement corrosion simulation method |
| CN104153760A (en) * | 2014-07-22 | 2014-11-19 | 中国石油大学(华东) | Oil-gas well cement sheath seal characteristic simulation test device and test method |
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