CN109633098A - Cementing concrete ring microcrack sealing agent enters merit rating device and evaluation method - Google Patents
Cementing concrete ring microcrack sealing agent enters merit rating device and evaluation method Download PDFInfo
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- CN109633098A CN109633098A CN201910006961.6A CN201910006961A CN109633098A CN 109633098 A CN109633098 A CN 109633098A CN 201910006961 A CN201910006961 A CN 201910006961A CN 109633098 A CN109633098 A CN 109633098A
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- 238000007789 sealing Methods 0.000 title claims abstract description 107
- 238000011156 evaluation Methods 0.000 title claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 97
- 239000004568 cement Substances 0.000 claims abstract description 82
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 43
- 238000002474 experimental method Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 13
- 230000036760 body temperature Effects 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000012163 sequencing technique Methods 0.000 claims description 2
- 238000002347 injection Methods 0.000 abstract description 17
- 239000007924 injection Substances 0.000 abstract description 17
- 230000000694 effects Effects 0.000 abstract description 3
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- 238000004088 simulation Methods 0.000 description 8
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- 238000011160 research Methods 0.000 description 5
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- 239000010935 stainless steel Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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- 238000002360 preparation method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
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- 230000008901 benefit Effects 0.000 description 2
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- 239000003292 glue Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000000654 additive Substances 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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Abstract
The invention discloses a kind of cementing concrete ring microcrack sealing agents to enter merit rating device and evaluation method, including autoclave body, injection pump, ring press pump, force (forcing) pump and heating control apparatus, the cement plunger and column Sandstone Cores of circular ring shape gum cover and artificial seam are equipped with inside autoclave body, upper lower head center is equipped with shallow grooves, there is sealing ring inside to seal autoclave body both ends, sealing agent is injected by upper end, simulates the microcrack operation of down-hole plugging cement sheath.The device analog underground hot environment, sealing agent, which plays a role, in microcrack realizes closure, it is pressed by force (forcing) pump and sealing agent is squeezed into the cement plunger of artificial seam, study the ability that sealing agent enters and is detained cement sheath microcrack, closure quality and influence that squeeze pressure blocks cementing concrete ring microcrack on sealing agent are studied, plugging effect of the sealing agent in the cement plunger of different artificial seam length can also be studied.
Description
Technical field
The present invention relates to evaluating apparatus and method that simulation sealing agent enters cementing concrete ring microcrack ability.The invention belongs to
In Oil-Gas Well Engineering well cementation field.
Background technique
Well cementation is the tripping in casing into well, and the construction operation of cement is injected to the annular space between wellbore and casing,
Reach protection and support the casing in oil/gas well, the purpose of packing oil, gas and water layer is to guarantee Subsequent secure drilling, long-term exploitation
One of key technology.The major function of cement is the annular space between sealing sleeve pipe and main body rock stratum, is prevented along pit shaft stream
Dynamic fluid.Also protection sleeve pipe keeps shaft structure more sound to cement from corrosion.
Cement sheath refers to the Behavior of Hardened Cement Paste that cement slurry is formed in annular space, and well cementing operation rear sleeve and stratum pass through cement
Ring is cemented together.The main function of cement sheath is to realize oil, water Inter-zonal packing, prevents crossflow, guarantees that oil gas is raw safely
It produces.In order to realize this function, cement sheath must be continuous and impermeable.Due to cement material self-defect-volume contraction and
Brittleness, at present all there is cement sheath packing failure in many oil/gas wells.Cement sheath microcrack is that Inter-zonal packing is caused to fail
One of the main reason for.It is that a kind of solution cementing concrete ring the effective measures of microcrack occurs that sealing agent is infused into microcrack.
The device that currently can be carried out the research extremely lacks, and Yang Zhejie et al. proposes a kind of cementing concrete ring integrality
(Yang Zhejie, Astou Gawane, Yang Qiang wait the simulation test of the cementing concrete ring microgap and microcrack to Simulation evaluation tester
Method [J] gas industry, 2015,35 (9)), which, which can simulate down-hole pressure variation, damages oil-well cement ring
And the process of microcrack is formed, so that the anti-situation of change for altering intensity of cementing concrete ring under different condition is measured, but the device
Shut-off capacity research after the injection microcrack of the sealing agent after microcrack is formed cannot be studied.
Walking Yuhuan, (step Yuhuan, Yu Liguo, Wang Chunyu wait Behavior of Hardened Cement Paste self-healing method of evaluating performance [J] laboratory research
With exploration, 2015,34 (7): 17-21.) a kind of Behavior of Hardened Cement Paste self-healing device for evaluating performance is proposed, the device is to block pressure
For index, the influence of oily self-healing material dosage and flaw size to Behavior of Hardened Cement Paste self-healing performance, card are met by experimental analysis
It is illustrated the feasibility that the evaluating apparatus and evaluation method carry out Behavior of Hardened Cement Paste self-healing performance evaluation, but the device cannot be accomplished pair
The maintenance of concrete column artificial microcrack beyond the Great Wall.
Summary of the invention
The purpose of the invention is to overcome above-mentioned the deficiencies in the prior art, under the conditions of a kind of simulation squeezing sealing agent is provided
Cementing concrete ring microcrack enters merit rating device and evaluation method, which can study sealing agent and enter ability, and research is squeezed
Injection pressure power blocks the closure quality and influence of cementing concrete ring microcrack on sealing agent.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of cementing concrete ring microcrack sealing agent enters merit rating device, comprising: autoclave body, the autoclave body are equipped with ring
Press hole；Annular gum cover, the annular gum cover are installed in the autoclave body, have in annular gum cover for being packed into crannied water
The circular cavity of mud plunger between annular gum cover and autoclave body there is ring to press chamber；Upper cover and lower head, the upper cover and lower head
It is separately positioned on the upper and lower part of the autoclave body, the upper cover is equipped with the pressurizing port for being connected to the circular cavity, under described
End socket is equipped with the first water outlet for being connected to the circular cavity；Force (forcing) pump, the force (forcing) pump pass through pipeline and the pressurizing port phase
Even；Ring press pump, the ring press pump press hole to be connected by pipeline with the ring；Heating device and heating control apparatus, the heating
Control device is connected with heating device, and heating device is connected with autoclave body.
Preferably, the upper cover includes:
Second upper cover, second upper cover are connected with the autoclave body, and connection circular cavity is formed in the middle part of the second upper cover
Inner cylinder；
First upper cover, first upper cover are connected with second upper cover, and the pressurizing port is located on first and seals
On head.
Preferably, the upper and lower ends of the upper cover, lower head respectively with annular gum cover tight contact between.
Preferably, ring pressure hole is located at the autoclave body side lower, and the autoclave body side surface upper part, which is equipped with, is connected to the ring
Press the second water outlet of chamber.
Preferably, the heating device includes the collet for being set in the autoclave body outer wall, and collet is equipped with heating wire, described to add
Heat control device is connected with the heating wire.
Preferably, the pipeline that the force (forcing) pump picks out is equipped with first switch.
It preferably, further include injection pump, the injection pump is connected by pipeline with the pressurizing port.
Preferably, the pipeline that the injection pump picks out is equipped with second switch.
The present invention also provides a kind of cementing concrete ring microcrack sealing agents to enter merit rating method, is consolidated using above-mentioned
Well cement ring microcrack sealing agent enters merit rating device, comprising the following steps:
(1) circular cavity will be put into crannied cement plunger；
(2) adjustment heating device makes kettle body temperature meet requirement of experiment；
(3) it gives annular gum cover to add ring pressure by ring press pump, tight contacts between cement plunger with annular gum cover；
(4) sealing agent is injected into the upper end of cement plunger；
(5) it is pressurizeed by force (forcing) pump to the intracorporal sealing agent of kettle；
(6) reaction terminates；
(7) enter merit rating: it is described refer to specified pressure into ability under the conditions of enter crack in ability size.
The step (1), (2) are without time sequencing.
Preferably, Sandstone Cores being first put into circular cavity in the step (1), cement plunger is placed on circular cavity again, and
Positioned at the top of Sandstone Cores.
Preferably, it is described refer to specified pressure into ability under the conditions of enter crack in ability size, step is:
1. at a particular pressure, quality is the sealing agent of M, the quality that cement plunger is weighed before testing is M1, from when pressurization
Start timing, when sealing agent is not flowed out from the first water outlet, the quality for weighing cement plunger after test again is M2, i.e. (M2-
M1) it is quality into sealing agent in crack, therefore sealing agent enters ability: L1=(M2-M1)/M；
And/or
2. at a particular pressure, quality is the sealing agent of M, the quality that cement plunger is weighed before testing is M1, to closure
Agent starts timing when pressurizeing, and when there is sealing agent to flow out from the first water outlet, timing terminates, and the size of time t, t can illustrate
Sealing agent enters ability in crack.
Preferably, in the step (1) with crannied cement plunger be people's work seam cement plunger.
The specific steps of this evaluation method are as follows:
(1) force (forcing) pump, ring press pump are connected with pressurizing port, ring pressure hole respectively, installs lower head, and at lower head center
Shallow grooves in be put into ring type seal, tighten the first bolt；Annular gum cover is put into inside autoclave body, inside annular gum cover lower end
It is tight contacted between with lower head, column Sandstone Cores is put into annular gum cover, then placed into crannied cement plunger, install
Second upper cover, and the shallow grooves at the second upper cover center are put into ring type seal, tighten the second bolt；
(2) adjustment heating device makes kettle body temperature meet requirement of experiment；
(3) the second water outlet is opened, opens ring press pump to ring pressure cavity water filling, when water goes out from the second of autoclave body upper side
When the mouth of a river is overflowed, the second water outlet is closed, continues that cavity water filling is pressed, to annular gum cover pressure, to make concrete column by ring press pump to ring
Plug is tight contacted between with annular gum cover；
(4) sealing agent that the quality prepared is M is injected by the second upper cover upper end, installs the first upper cover, first
The shallow grooves at upper cover center are put into ring type seal, tighten third bolt；
(5) first switch being connected with force (forcing) pump is opened, is pressed by pressurizing port to sealing agent by force (forcing) pump, by sealing agent
Cement plunger is squeezed into, realizes and is pressurizeed to the intracorporal sealing agent of kettle to simulate squeeze pressure when cementing；
(6) after reacting the closure for realizing crack in crack according to requirement of experiment sealing agent, force (forcing) pump, ring pressure are closed
Pump, closes heating control apparatus, and device is cooled to room temperature；
(7) shut-off capacity is evaluated.
Beneficial effects of the present invention:
(1) different temperatures, different fracture length, variety classes sealing agent can be carried out using evaluating apparatus of the invention
Block experiment；
(2) ability that different squeeze pressures enter microcrack to sealing agent can be studied using evaluating apparatus of the invention.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is that a kind of simulation cementing concrete ring microcrack sealing agent of the present invention enters ability and shut-off capacity evaluating apparatus
Structural schematic diagram；
Fig. 2 is the flow diagram that cementing concrete ring microcrack sealing agent of the present invention enters merit rating method；
Fig. 3 is the flow diagram of cementing concrete ring microcrack sealing agent shut-off capacity evaluation method of the present invention.
Description of symbols:
The second upper cover of 1-；2- autoclave body；3- heating control apparatus；4- ring presses chamber；5- annular gum cover；6- lower head；7- sand
Rock rock core；8- cement plunger；The second water outlet of 9-；10- sealing ring；11- force (forcing) pump；12- injection pump；13- heating wire；14- ring
Press pump；15- bracket；16- graduated cylinder；The first bolt of 17-；The second bolt of 18-；19- third bolt；20- pressurizing port (water filling port)；
The first upper cover of 21-；The first water outlet of 22-；23- first switch；24- second switch；25- ring presses hole；26- pressure adjustable section peace
Full valve；27- outlet valve；28- lower head cavity pressure table.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, the orientation or position of the instructions such as term " on ", "lower", "left", "right", "inner", "outside"
Relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention rather than requires the present invention necessary
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.
Sealing agent enters ability and shut-off capacity evaluating apparatus in a kind of simulation cementing concrete ring microcrack of embodiment 1
Referring to Fig.1, the evaluating apparatus that the present embodiment provides, which has, enters merit rating and shut-off capacity Function of Evaluation.
It is made of autoclave body 2, injection pump 12, ring press pump 14, force (forcing) pump 11 and heating control apparatus 3.
Specifically, the autoclave body 2 is fixed on bracket 15, the upper and lower part of autoclave body 2 is respectively equipped with 1 He of the second upper cover
Lower head 6,1 top of the second upper cover are the first upper covers 21.Second upper cover 1 and lower head 6 respectively by the second bolt 18,
First bolt 17 is connect with autoclave body 2, and the first upper cover 21 is connect by third bolt 19 with the second upper cover 1.Second upper cover
1,6 center of lower head is equipped with shallow grooves, and 2 both ends of autoclave body are sealed by sealing ring 10, that is, second upper cover 1 is under
End socket 6 is sealed with 2 inner wall of autoclave body by sealing ring 10, and first upper cover 21 passes through close with 1 inner cylinder inner wall of the second upper cover
Seal 10 seals.
First upper cover, 21 center is equipped with pressurizing port 20 (water filling port), and the force (forcing) pump 11 passes through pipeline and pressurizing port
20 are connected, and the pipeline is equipped with first switch 23, when the force (forcing) pump 11 is connected to pressurizing port 20 (when first switch 23 is opened),
For simulating the upper pressure (squeeze pressure) when squeezing sealing agent.The injection pump 12 passes through pipeline and the (water filling of pressurizing port 20
Mouthful) be connected, the pipeline is equipped with second switch 24, and when the injection pump 12 is connected to water filling port (first switch 23 is closed, and second
When switch 24 is opened), pressure is broken through after sealing agent blocks for simulating.
6 center of lower head is equipped with the first water outlet 22, convenient for smooth across the extra substance of columnar Sandstone Cores 7
Flow out autoclave body 2.Second water outlet, 22 lower end connects outlet valve 27, is provided with lower head cavity pressure on the second water outlet 22
Table 28.
2 lower side of autoclave body is equipped with the ring pressure hole 25 led to inside autoclave body 2, and ring pressure hole 25 passes through pipeline and institute
State the connection of ring press pump 14.
The annular gum cover 5 is installed in the autoclave body 2, is had in annular gum cover 5 for being packed into crannied cement
The circular cavity of plunger 8 between annular gum cover 5 and autoclave body 2 there is ring to press chamber 4.The upper and lower ends of annular gum cover 5 respectively with second on
End socket 1 and lower head 6 tight contact between, mutually isolated between chamber and ring pressure chamber 4 to be held round.
The ring press pump 14 presses the annular gum cover 5 in 25 pairs of hole to apply ring pressure by ring, makes water injection 2 inner wall of autoclave body and annular glue
In the circular cavity of 5 composition of set, the purpose of ring extrusion pressure ring shape gum cover 5 is to seal annular gum cover 5 and cement plunger 8, sandstone
Gap between rock core 7 pass through sealing agent can only from cement plunger 8.
2 upper side of autoclave body be equipped with the second water outlet 9, it is described annular gum cover 5 on it is corresponding with the second water outlet 9
Position is equipped with the through-hole matched with the second water outlet 9, and sealing ring 10, the second water outlet are equipped between the second water outlet 9 and through-hole
Mouth 9 is equipped with pressure adjustable section safety valve 26.Second water outlet 9 is water spill-over head piece when ring press pump 14 pumps.
The outer wall of the autoclave body 2 is equipped with collet, is equipped with heating wire 13, the heating control apparatus 3 and institute in the collet
The connection of heating wire 13 is stated, control adjusts experimental temperature.
When using the present apparatus, sealing agent is injected by upper end, simulates the microcrack operation of down-hole plugging cement sheath.The device can mould
Quasi- underground hot environment, sealing agent, which plays a role, in microcrack realizes closure, is pressed by force (forcing) pump and squeezes into sealing agent
Cement plunger through artificial seam, research sealing agent enter and are detained the ability of cement sheath microcrack, study squeeze pressure to envelope
Blocking agent blocks the closure quality and influence of cementing concrete ring microcrack, can also study sealing agent in different artificial seam length
Plugging effect in cement plunger.
Embodiment 2 is entered using cementing concrete ring microcrack under the conditions of the unit simulation squeezing sealing agent of above-described embodiment 1
Ability and the method for shut-off capacity evaluation:
Into experiment: first connecting each pressurizing device by pipeline and the corresponding interface on autoclave body 2, and in water outlet 22
Graduated cylinder 16 is placed at place, then installs the sealing ring 10 of lower head 6, lower head 6 is loaded onto, and tightens the first bolt 17, will be annular
Gum cover 5 is put into inside autoclave body 2, and annular 5 lower part of gum cover is packaged with lower head 6, and adjustment heating control apparatus 3 makes temperature in autoclave body 2
Meet requirement of experiment, Sandstone Cores 7 and seam cement plunger 8 are sequentially placed into inside annular gum cover 5, by the second upper cover 1
Sealing ring 10 installs, and loads onto the second upper cover 1, tightens the second bolt 18, gives annular gum cover 5 plus ring pressure by ring press pump 14, makes
Sandstone Cores 7 and seam cement plunger 8 are tight contacted between with annular gum cover 5, by sealing agent that quality is M by the second upper cover 1
Cylinder injection, the sealing ring 10 of the first upper cover 21 is installed, the first upper cover 21 is installed, and tightens third bolt 19, opens the
One switch 23 is pressurizeed to the sealing agent in autoclave body 2 by force (forcing) pump 11, simulates top squeeze pressure, caught using graduated cylinder 16 from out
The fluid that the mouth of a river 22 is flowed out closes ring press pump 14, force (forcing) pump 11 after the requirement of experiment reaction time, closes computer heating control
Device 3, blocking experiment terminates, and device is cooled to room temperature, and evaluation sealing agent enters microcrack ability.
It breaks through experiment: first connecting each pressurizing device by pipeline and the corresponding interface on autoclave body 2, and in water outlet 22
Graduated cylinder 16 is placed at place, then installs 6 sealing ring 10 of lower head, lower head 6 is loaded onto, and the first bolt 17 is tightened, by annular glue
Set 5 is put into inside autoclave body 2, and annular 5 lower part of gum cover is packaged with lower head 6, and adjustment heating control apparatus 3 keeps temperature in autoclave body 2 full
Sandstone Cores 7 and seam cement plunger 8 are sequentially placed into inside annular gum cover 5 by sufficient requirement of experiment, by the close of the second upper cover 1
Seal 10 installs, and loads onto the second upper cover 1, tightens the second bolt 18, gives annular gum cover 5 plus ring pressure by ring press pump 14, makes to seal
Sandstone Cores 7 and seam cement plunger 8 in stifled experiment are tight contacted between with annular gum cover 5, by the sealing ring of the first upper cover 21
10 install, and the first upper cover 21 is installed, and tighten third bolt 19, close first switch 23, second switch 24 are opened, by injecting
It pumps the seam cement plunger 8 blocked in 12 pairs of autoclave bodies 2 and applies hydraulic pressure, the crack that simulation impact has blocked is broken through pressure, pressed
After the requirement of experiment reaction time, ring press pump 14, injection pump 12 are closed, heating control apparatus 3 is closed, lays down the first upper cover
21, the second upper cover 1, lower head 6.
Into ability investigate be sealing agent plastic consolidation before performance, shut-off capacity includes retentivity, and consideration is
Plastic consolidates later performance.
Sealing agent can enter ability in crack under the conditions of the entrance ability refers to specified pressure.
The retentivity refers to that under a certain pressure the sealing agent in crack is trapped in the ability in crack.That is, being detained energy
Power fingering enters the sealing agent in crack under a certain pressure, in sealing agent or has sealing agent outflow, remaining sealing agent, which is stored in, to be split
Ability in seam.
The anti-ability of breaking through, which refers to, certain breaks through whether pressure can break through the cement plunger blocked.
Evaluation of result:
(1) sealing agent enters microcrack ability (entering ability):
1. the first upper cover 21, the second upper cover 1, lower head 6 are laid down, by the seam cement plunger 8 and sandstone after closure
Rock core 7 takes out.At a particular pressure, quality is the sealing agent of M, and the quality that cement plunger is weighed before testing is M1, from when pressurization
Start timing, when sealing agent is not flowed out from the first water outlet, the quality for weighing cement plunger after test again is M2, i.e. (M2-
M1) it is quality into sealing agent in crack, therefore sealing agent enters ability: L1=(M2-M1)/M；
And/or
2. at a particular pressure, quality is the sealing agent of M, the quality that cement plunger is weighed before testing is M1, to closure
Agent starts timing when pressurizeing, and when there is sealing agent to flow out from the first water outlet, timing terminates, and the size of time t, t can illustrate
Sealing agent enters ability in crack.
Specified pressure refers to squeeze pressure.1. method is laid particular emphasis on investigates the case where sealing agent is not entirely through cement plunger, side
2. method is laid particular emphasis on considers the case where sealing agent has passed through cement plunger completely.
(2) sealing agent blocks microcrack ability (retentivity):
A. the cement plunger blocked is reentered into autoclave body, re-assemblies instrument, heated, after adding ring pressure；Or
After " entering experiment ",
B. hydraulic pressure is applied by cement plunger of the water filling port to artificial seam using injection pump and carries out displacement,
Whether the water outlet 22 for c. observing lower head 6 has fluid persistently to flow out whithin a period of time, to evaluate sealing agent envelope
The ability quality of stifled microcrack.
(3) sealing agent blocks microcrack ability (anti-to break through ability): outlet valve 27 being closed, 6 chamber of lower head is observed
Interior pressure gauge 28, if pressure gauge registration is gradually increased finally identical as the injection pressure of injection pump 12, table whithin a period of time
Show that hydraulic pressure has broken through the seam cement plunger 8 blocked.If there is not above situation, the pressure difference between pressure gauge is maintained
It is constant, show that sealing agent is realized well and blocks.
In the technical program, what the force (forcing) pump of this instrument was simulated is squeezing pressure when squeezing sealing agent to cement sheath microcrack
Power, what injection pump 12 was simulated is the pressure of breaking through for breaking through the microcrack for having been carried out closure, and what ring press pump 14 was simulated is stratum pair
The radial stress of cement sheath realizes that annular gum cover 5 is close to seam cement plunger 8 and Sandstone Cores 7, heating and control device simultaneously
What is simulated is the temperature that stratum locating for microcrack occurs in cementing concrete ring.
In the technical program, the cement plunger 8 of seam will grow (100+30mm Max) as far as possible, and cement plunger 8 is too short, then
Sealing agent may penetrate cement plunger 8 quickly, not have the effect of the different sealing agents of comparison.Sandstone Cores 7 may consider to remove,
Adding the rock core is that sealing agent penetrates crack in order to prevent, and flow velocity leads to greatly very much fluid communication, and Sandstone Cores 7 can play centainly
Inhibition, be to take into account safety factor, while certain closure of the simulated formation to sealing agent.
In the technical program, the cement plunger 8 of the artificial seam and Sandstone Cores 7 the preparation method comprises the following steps: production water
The mold of mud plunger 8 is diameter 30mm, and the circular ring shape stainless-steel pipe of height 100mm, thickness 2mm make the mould of Sandstone Cores 7
Having is diameter 30mm, the circular ring shape stainless-steel pipe of high 20mm, and after curing time, two rock cores taking-up both ends are polished flat
It is whole, take the method for artificial seam by 8 pressure break of cement plunger at crack required for testing.
The used seam cement plunger 8 that is previously mentioned in this instrument and Sandstone Cores 7 it is specifically used as follows:
1, the distilled water of certain mass and good China's G class g cement the preparation process of cement plunger 8: are pressed into requirement of experiment ratio respectively
Example mixing does not add additive simultaneously to prepare cement slurry, and slurry is poured into diameter 30mm, height 105mm, the circle of thickness 2.5mm
Ring stainless steel Steel pipe mould (note: the upper and lower end face of mold and inner wall shifted to an earlier date coating butter and by lower end surface with it is rectangular
Contact glass sheet), another block of square glass plate is changed into mold upper end, so far cement slurry has been ready for seal operation.It will be whole
Body (upper and lower rectangular glass plate clip circular ring shape stainless-steel pipe mold) be placed on experiment set conserved in the water bath of temperature to
The time required to experiment.
2, the seam process of cement plunger 8: the mold conserved is taken out, the cement plunger 8 in mold is taken out, with beating
Grinder polishes flat the both ends of cement plunger 8, and in this experiment, (specific works are former for the mature Brazilian split the law of use
Reason be not explained in detail herein) by cement plunger 8 along fracture into two.Each post-rift fracture width cannot keep certain phase
Together, because being influenced by fracture process, but can the width keep in a certain range, it is micro- by being added into crack
Fracture width range required for the modes such as small steel ball or thin steel bar support to.
3, the preparation process of Sandstone Cores 7: the sand and outer-penetrating agent of mesh number needed for testing respectively are mixed, and will mix
Substance afterwards pours into diameter 30mm, and the circular ring shape stainless-steel pipe mold of high 25mm, thickness 2.5mm carry out seal operation, in reality
It tests and conserves a period of time under required pressure condition, take out rock core after curing time.
Note: production cement plunger 8 and Sandstone Cores 7 raw material be not it is single, limited to.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is defined by the claims and their equivalents.
Claims (9)
1. a kind of cementing concrete ring microcrack sealing agent enters merit rating device characterized by comprising
Autoclave body, the autoclave body are equipped with ring and press hole；
Annular gum cover, the annular gum cover are installed in the autoclave body, have in annular gum cover for being packed into crannied water
The circular cavity of mud plunger between annular gum cover and autoclave body there is ring to press chamber；
Upper cover and lower head, the upper cover and lower head are separately positioned on the upper and lower part of the autoclave body, the upper envelope
Head is equipped with the pressurizing port for being connected to the circular cavity, and the lower head is equipped with the first water outlet for being connected to the circular cavity；
Force (forcing) pump, the force (forcing) pump are connected by pipeline with the pressurizing port；
Ring press pump, the ring press pump press hole to be connected by pipeline with the ring；
Heating device and heating control apparatus, the heating control apparatus are connected with heating device, and heating device is connected with autoclave body.
2. cementing concrete ring microcrack sealing agent according to claim 1 enters merit rating device, which is characterized in that institute
Stating upper cover includes:
Second upper cover, second upper cover are connected with the autoclave body, and the interior of connection circular cavity is formed in the middle part of the second upper cover
Cylinder；
First upper cover, first upper cover are connected with second upper cover, and the pressurizing port is located on the first upper cover.
3. cementing concrete ring microcrack sealing agent according to claim 1 or 2 enters merit rating device, feature exists
In the upper and lower ends of the upper cover, lower head respectively with annular gum cover tight contact between.
4. cementing concrete ring microcrack sealing agent according to claim 1 enters merit rating device, which is characterized in that institute
It states and is sealed by sealing ring between upper cover, lower head and autoclave body.
5. cementing concrete ring microcrack sealing agent according to claim 1 enters merit rating device, which is characterized in that institute
It states ring pressure hole and is located at the autoclave body side lower, the autoclave body side surface upper part is equipped with the second water outlet for being connected to the ring pressure chamber.
6. cementing concrete ring microcrack sealing agent according to claim 1 enters merit rating device, which is characterized in that institute
Stating heating device includes the collet for being set in the autoclave body outer wall, and collet is equipped with heating wire, the heating control apparatus with it is described
Heating wire is connected.
7. cementing concrete ring microcrack sealing agent enters merit rating method, which is characterized in that use any one of claim 1-6
The cementing concrete ring microcrack sealing agent enters merit rating device, comprising the following steps:
(1) circular cavity will be put into crannied cement plunger；
(2) adjustment heating device makes kettle body temperature meet requirement of experiment；
(3) it gives annular gum cover to add ring pressure by ring press pump, tight contacts between cement plunger with annular gum cover；
(4) sealing agent is injected into the upper end of cement plunger；
(5) it is pressurizeed by force (forcing) pump to the intracorporal sealing agent of kettle；
(6) reaction terminates；
(7) enter merit rating: sealing agent can enter ability in crack under the conditions of the entrance ability refers to specified pressure；
The step (1), (2) are without time sequencing.
8. evaluation method according to claim 7, which is characterized in that Sandstone Cores are first put into circle in the step (1)
Shape chamber, then cement plunger is placed on circular cavity, and be located at the top of Sandstone Cores.
9. evaluation method according to claim 7, which is characterized in that it is described to be measured into ability using following methods,
Step is:
1. at a particular pressure, quality is the sealing agent of M, the quality that cement plunger is weighed before testing is M1, counted since when pressurizeing
When, when sealing agent is not flowed out from the first water outlet, the quality for weighing cement plunger after test again is M2, i.e. (M2-M1) be into
Enter the quality of sealing agent in crack, therefore sealing agent enters ability: L1=(M2-M1)/M；
And/or
2. at a particular pressure, quality is the sealing agent of M, the quality that cement plunger is weighed before testing is M1, pressurize to sealing agent
When start timing, when there is sealing agent to flow out from the first water outlet, timing terminates, and the size of time t, t can illustrate sealing agent
Enter ability in crack.
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| CN109633098B (en) | 2024-02-27 |
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