CN106285526A - Simulation Cementing rinses experimental provision and the experimental technique of mud cake - Google Patents
Simulation Cementing rinses experimental provision and the experimental technique of mud cake Download PDFInfo
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- CN106285526A CN106285526A CN201610849503.5A CN201610849503A CN106285526A CN 106285526 A CN106285526 A CN 106285526A CN 201610849503 A CN201610849503 A CN 201610849503A CN 106285526 A CN106285526 A CN 106285526A
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- simulation
- mud cake
- cementing
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- wellbore hole
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- 238000004088 simulation Methods 0.000 title claims abstract description 162
- 238000002474 experimental method Methods 0.000 title claims abstract description 15
- 238000011010 flushing procedure Methods 0.000 claims abstract description 16
- 239000011435 rock Substances 0.000 claims description 24
- 239000012530 fluid Substances 0.000 claims description 19
- 239000004568 cement Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 17
- 238000005553 drilling Methods 0.000 description 16
- 239000003129 oil well Substances 0.000 description 7
- 239000012071 phase Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000004520 agglutination Effects 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention provides a kind of Cementing of simulating to rinse experimental provision and the experimental technique of mud cake, described simulation Cementing rinses the experimental provision of mud cake for simulating the Cementing flushing to the mud cake on target wellbore wall, comprising: the body of hollow, its have by back to top and bottom, wherein bottom is closure end, and body is provided with the first opening and the second opening；It is located in this most internal and can be along the simulation wellbore hole moved radially of body by the first opening；Through hole it is provided with in simulation wellbore hole；Mud cake can be arranged on the outer wall of simulation wellbore hole；The second annular space it is formed with between simulation wellbore hole and body；When Cementing flows into the second annular space from through hole and flows out from the second opening, mud cake can be rinsed by Cementing.Present invention achieves the purpose of the experimental provision that a kind of simulation Cementing flushing mud cake that can truly simulate the process that actual mud cake rinses is provided.
Description
Technical field
The present invention relates to oil gas well cementing operation technical field, particularly relate to a kind of Cementing of simulating and rinse the experiment of mud cake
Device and experimental technique.
Background technology
During oil gas well drilling, under the effect of pressure differential, hole from the Free water in drilling fluid to rock of borehole or
The phenomenon of infiltration, the referred to as leak-off effect of drilling fluid in gap.Along with drilling fluid enters stratum in the leak-off of the borehole wall, Free water,
Solid phase particles in drilling fluid is just attached on the borehole wall form mud cake.
Well cementation be in well under enter sleeve pipe, and the construction injecting cement to the first annular space between well and sleeve pipe is made
Industry.Owing to well cementation is injection cement in the first annular space of sleeve pipe and the borehole wall, so the consolidating of drilling fluid in drilling process
The mud cake that phase granule is formed on the borehole wall can be mixed between cement mortar and stratum, thus makes the bonding quality of well cementation second interface
Become impact.
In order to improve well cementation interface agglutination quality, extend Oil/gas Well Production Life, need the forward direction well at cementing
Inject one section of liquid in first annular space between wall and sleeve pipe the borehole wall and sleeve pipe are carried out, referred to as prepad fluid.Warp
Cross years of researches, in terms of prepad fluid, the most achieve significant progress, but for the developing result of prepad fluid,
There is no the practice and the standard of scientific unity at present both at home and abroad, this also becomes and hinders one of Cementing technological progress mainly
Factor.
Chinese invention patent application CN104675345A discloses " a kind of Cementing flush efficiency engineering simulation quantization
Evaluating apparatus and method ".This Cementing flush efficiency engineering simulation quantitatively evaluating device includes support, Support tray, artificial
Rock core, core holding unit, variable speed electric motors, particularly, mass sensor, computer acquisition terminal, described support has altitude mixture control fixture,
Placing the slurry cup containing Cementing on described Support tray, described altitude mixture control fixture is sequentially connected with mass sensor, speed change
Motor and core holding unit, described core holding unit fixes artificial core by trip bolt, and described variable speed electric motors, particularly is connected with motor
Speed regulator, described mass sensor is connected with computer acquisition terminal.This Cementing flush efficiency stage die analog quantity
Change evaluating apparatus although the mud cake on artificial core can be rinsed, but this device be artificial core is positioned at well cementation before
Put in liquid, be rinsed by rotating artificial core, and in actual well cementing operation, the mud cake on the borehole wall is in well cementation
Prepad fluid injects in the first annular space between the borehole wall and sleeve pipe, and is rinsed during discharging by sleeve pipe, and overlaps
Pipe is generally of certain degree of eccentricity in the well of oil well, so the mud cake of zones of different on the borehole wall is had by Cementing
Different developing results, and the Cementing of this device has identical flushing effect to the mud cake of zones of different on artificial core
Really, so this device the most truly simulates the process that actual mud cake rinses, thus have impact on the verity rinsing result.
Summary of the invention
It is an object of the invention to provide a kind of simulation Cementing punching that can truly simulate the process that actual mud cake rinses
Wash experimental provision and the experimental technique of mud cake.
The above-mentioned purpose of the present invention can use following technical proposal to realize: a kind of Cementing of simulating rinses mud cake
Experimental provision, described simulation Cementing rinses the experimental provision of mud cake and is used for simulating Cementing to target wellbore wall
The flushing of mud cake, comprising: the body of hollow, its have by back to top and bottom, wherein said bottom is closure
End, described body is provided with the first opening and the second opening；It is located in described internal and energy edge by described first opening
The simulation wellbore hole moved radially of described body；It is provided with through hole in described simulation wellbore hole；On the outer wall of described simulation wellbore hole
Described mud cake can be arranged；The second annular space it is formed with between described simulation wellbore hole and described body；When described Cementing
Flowing into described second annular space and when described second opening flows out from described through hole, described Cementing can be to described
Mud cake is rinsed；Or when described Cementing flows into described second annular space from described second opening and passes through from described
When through hole flows out, described mud cake can be rinsed by described Cementing.
As one preferred embodiment, described body includes the cylinder with described bottom and has described top
Lid, described simulation wellbore hole fixes with described lid, and described lid can move along the radial direction of described body relative to described cylinder
Dynamic.
As one preferred embodiment, comprising: the projection being arranged on described lid outer wall, described projection sets
It is equipped with the through slot radially extended；It is movably arranged at the fixture in described through slot, when described lid is relative to institute
Stating cylinder along after the moving radially of described body, described fixture can fix described cylinder and described lid.
As one preferred embodiment, the height of described second opening is higher than the peak of described mud cake.
As one preferred embodiment, described body is provided with the first valve and the second valve, described first valve
Door can control the opening and closing of described first opening, and described second valve can control the opening and closing of described second opening.
As one preferred embodiment, described simulation wellbore hole includes inner tube and the simulation rock being arranged in said inner tube
Layer, described simulation rock stratum has the porosity of the rock stratum of predetermined porosity, described predetermined porosity and described target wellbore
Identical.
As one preferred embodiment, described simulation wellbore hole includes the connection detachably connected with said inner tube
Part, described connector is arranged in described first opening, is provided with described through hole in said inner tube, arranges in described connector
There is the interface channel being connected with described through hole.
As one preferred embodiment, comprising: cementing device and test device；Described cementing device includes cylinder
With the cement being arranged in described cylinder, described cement is for after described mud cake is rinsed, with the outer wall of described simulation wellbore hole
Mutually cementing, to form cement sheath；Described test device can obtain described simulation wellbore hole and depart from the active force of described cement sheath.
Utilize the experimental technique of the experimental provision of above-mentioned simulation Cementing flushing mud cake, comprising: to described mould
Intend the simulation rock stratum input aqueous water of pit shaft, till the water content of described simulation wellbore hole no longer changes；Obtain described simulation
First mass of pit shaft；The outer wall of described simulation wellbore hole is arranged described mud cake；Obtain the second mass of described simulation wellbore hole；
Mud cake on described simulation wellbore hole is rinsed；Obtain the 3rd mass of described simulation wellbore hole；According to predetermined rule, according to
Flush efficiency described in described first mass, described second mass and described 3rd Mass Calculation.
As one preferred embodiment, described pre-defined rule is flush efficiencyWherein, m1It is first
Quality；m2It it is the second mass；m3It it is the 3rd mass.
A kind of experimental provision simulating Cementing flushing mud cake that the present invention provides provides the benefit that: the present invention sets
Putting can be along the simulation wellbore hole moved radially of body, such that it is able to by moving radially simulation wellbore hole, to reach true simulated oil
The well middle sleeve degree of eccentricity in the wellbore, is provided with through hole in this simulation wellbore hole, when Cementing flows into the from through hole
Second ring space and from second opening flow out time, mud cake can be rinsed by Cementing；Or when Cementing is from the
Two openings flow into the second annular space and when through hole flows out, and described mud cake can be rinsed by Cementing, it is thus possible to
The process that the actual mud cake of true reappearance rinses.The degree of eccentricity is there is in the present invention by the actual mud cake flushing process middle sleeve of true simulation
Situation and the actual mud cake of true reappearance rinse process, it is achieved that provide a kind of can truly simulate actual mud cake flushing process
Simulation Cementing rinse the purpose of experimental provision of mud cake.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
The simulation Cementing that Fig. 1 one embodiment of the present invention provides rinses the structural representation of the experimental provision of mud cake
Figure；
The structural representation of the experimental provision arranging mud cake that Fig. 2 one embodiment of the present invention provides；
The structural representation of the cementing device that Fig. 3 one embodiment of the present invention provides；
The simulation Cementing that Fig. 4 one embodiment of the present invention provides rinses the flow chart of the experimental technique of mud cake.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
Refer to Fig. 1.The present invention provides a kind of Cementing of simulating to rinse the experimental provision of mud cake, and described simulation is cemented the well
The experimental provision of preflush mud cake is used for simulating the Cementing flushing to the mud cake on target wellbore wall, comprising:
The body 11 of hollow, its have by back to top 13 and bottom 15, wherein said bottom 15 is closure end, described body 11
On be provided with the first opening 19 and the second opening 21；In being located in described body 11 by described first opening 19 and can be along described
The simulation wellbore hole 39 moved radially of body 11；It is provided with through hole 43 in described simulation wellbore hole 39；Described simulation wellbore hole 39
Described mud cake can be arranged on outer wall；The second annular space 17 it is formed with between described simulation wellbore hole 39 and described body 11；Work as institute
State Cementing and flow into described second annular space 17 and when described second opening 21 flows out from described through hole 43, described
Described mud cake can be rinsed by Cementing；Or when described Cementing flows into described the from described second opening 21
Second ring space 17 when described through hole 43 flows out, described mud cake can be rinsed by described Cementing.
A kind of experimental provision simulating Cementing flushing mud cake that the present invention provides is arranged can be along the radial direction of body 11
The simulation wellbore hole 39 of movement, such that it is able to by moving radially simulation wellbore hole 39, to reach true simulation oil well middle sleeve at well
The degree of eccentricity in Yan, is provided with through hole 43 in this simulation wellbore hole 39, when Cementing flows into the second annular from through hole 43
Space 17 when the second opening 21 flows out, mud cake can be rinsed by Cementing；Or when Cementing is from second
Opening 21 flows into the second annular space 17 and when through hole 43 flows out, and mud cake can be rinsed by Cementing, it is thus possible to
The process that the actual mud cake of true reappearance rinses.The degree of eccentricity is there is in the present invention by the actual mud cake flushing process middle sleeve of true simulation
Situation and the actual mud cake of true reappearance rinse process, it is achieved that provide a kind of can truly simulate actual mud cake flushing process
Simulation Cementing rinse the purpose of experimental provision of mud cake.
As it is shown in figure 1, in the present embodiment, a kind of Cementing of simulating that the present invention provides rinses the experiment of mud cake
Device is for simulating the Cementing flushing to the mud cake on target wellbore wall, can truly simulate the mistake that actual mud cake rinses
Journey.This target wellbore refers to need the pit shaft of the actual oil well of simulation.This simulation Cementing rinses the experimental provision bag of mud cake
Include: the body 11 of hollow.This body 11 is used for rinsing mud cake.This body 11 have by back to top 13 and bottom 15, its
Middle bottom 15 is closure end, and this body is provided with the first opening 19 and the second opening 21.
In the present embodiment, it is provided with the first opening 19 in this body 11 and is arranged in simulation wellbore hole 39 therein.
This simulation wellbore hole 39 is for simulating the borehole wall of actual oil well, it is thus possible to carry out the mud cake on this simulation wellbore hole 39 in body 11
Rinse.This simulation wellbore hole 39 can moving radially along body 11, such that it is able to by moving radially simulation wellbore hole 39, to reach true
The real simulation oil well middle sleeve degree of eccentricity in the wellbore.Being provided with through hole 43 in this simulation wellbore hole 39, this through hole 43 is permissible
Cementing is made to circulate.
In the present embodiment, the second annular space 17 it is formed with between this simulation wellbore hole 39 and body 11.This simulation well
Mud cake can be arranged on the outer wall of cylinder 39；When Cementing flows into the second annular space 17 and from the second opening 21 from through hole 43
During outflow, mud cake can be rinsed by Cementing；Or when Cementing flows into the second annular sky from the second opening 21
Between 17 and when through hole 43 flows out, mud cake can be rinsed by Cementing, it is thus possible to the actual mud cake of true reappearance rinses
Process.Situation and the true reappearance reality of the degree of eccentricity is there is in the present invention by the actual mud cake flushing process middle sleeve of true simulation
The process that mud cake rinses, it is achieved that provide a kind of simulation Cementing that can truly simulate the process that actual mud cake rinses to rinse
The purpose of the experimental provision of mud cake.
As in figure 2 it is shown, in the present embodiment, the invention provides a kind of layout mud on the outer wall of this simulation wellbore hole 39
The experimental provision of cake, comprising: housing 53；This housing 53 is used for housing simulation wellbore hole 39, with on the outer wall of simulation wellbore hole 39
Arrange mud cake.This simulation wellbore hole 39 is arranged in this housing 53, is formed between outer wall and the inwall of housing 53 of simulation wellbore hole 39
There is the 3rd annular space 59；3rd annular space 59 can inject drilling fluid.This simulation wellbore hole 39 includes the simulation with hole
Rock stratum 41, this porosity communication the 3rd annular space 59 and through hole 43, when drilling fluid flows into through hole from the 3rd annular space 59
When 43, drilling fluid can form mud cake on the outer wall of simulation rock stratum 41.
In the present embodiment, this simulation wellbore hole 39 include back to the first end face 47 and the second end face 49, the first end
Face 47 and the second end face 49 all inwalls with housing 53 engage, thus the drilling fluid in the 3rd annular space 59 can not be from mould
The end face intending pit shaft 39 passes through, thus ensure that mud cake can only be arranged on the outer wall of simulation wellbore hole 39.Specifically, this housing 53
Inside it is provided with the choking portion 51 that can match with the first end face 47, between this first end face 47 and this choking portion 51, is provided with pad
Sheet, is provided with pad between the inwall of this second end face 49 and housing 53.
In the present embodiment, the centrage of simulation wellbore hole 39 and the centerline collineation of housing 53, thus mud cake can be uniformly
It is arranged on the outer wall of this simulation wellbore hole 39.
In the present embodiment, housing 53 is provided with the first perforate 55 being connected with through hole 43, housing 53 sets
Putting the second perforate 57 being connected with the 3rd annular space 59, the second perforate 57 is for when having drilling fluid in the 3rd annular space 59
Time, drilling fluid is pressurizeed, so that drilling fluid flows in through hole 43 from the 3rd annular space 59, thus at simulation wellbore hole 39
Outer wall on formed mud cake.
In one embodiment, body 11 includes the cylinder 23 with bottom 15 and has the lid 25 on top 13, mould
Intending pit shaft 39 to fix with lid 25, lid 25 can be relative to cylinder 23 moving radially along body 11.
In the present embodiment, when this lid 25 is relative to cylinder 23 moving radially along body 11, with this lid 25 phase
The simulation wellbore hole 39 connected also can be relative to cylinder 23 moving radially along body 11, it is thus possible to adjust simulation wellbore hole 39 at body
The degree of eccentricity in 11, with the simulation oil well middle sleeve degree of eccentricity in the wellbore.
In one embodiment, body 11 includes the cylinder 23 with bottom 15 and has the lid 25 on top 13, mould
Intending pit shaft 39 to fix with lid 25, lid 25 can be relative to cylinder 23 moving radially along body 11.
In one embodiment, the top of body 11 is provided with stopping means, and this simulation wellbore hole 39 is fixedly connected on this
On stopping means.This stopping means includes the multiple limiting sections radially extended along body, and the plurality of limiting section is used for making simulation well
Cylinder 39 moving radially along body 11, it is thus possible to adjust the simulation wellbore hole 39 degree of eccentricity in body 11, to overlap in simulation oil well
The pipe degree of eccentricity in the wellbore.The plurality of limiting section can be screwed hole, the spiral shell that this screwed hole can be fixing with on this simulation wellbore hole
Follow closely threaded.
In the present embodiment, a kind of experiment dress arranging mud cake on the outer wall of this simulation wellbore hole 39 that the present invention provides
Put and include: be arranged at the projection 31 on lid 25 outer wall, be provided with, on protruding 31, the through slot radially extended；Set movably
The fixture 33 being placed in through slot, when lid 25 relative to cylinder 23 along after the moving radially of body 11, fixture 33 can be solid
Safety barrel body 23 and lid 25.
In one embodiment, this fixture 33 can be bolt, and the through slot that this bolt can radially extend moves,
When lid 25 relative to cylinder 23 along after the moving radially of body 11, this cylinder 23 can be bolted with lid 25.
As it is shown in figure 1, in one embodiment, the height of the second opening 21 is higher than the peak of mud cake.
In the present embodiment, the peak of this mud cake refers to the mud cake that simulation wellbore hole 39 outer wall upper position is the highest, second
The height of opening 21 is higher than the peak of mud cake, it is ensured that when Cementing flows into the second annular space 17 from through hole 43
And when the second opening 21 flows out, this Cementing can be full of in the second annular space, so that on simulation wellbore hole 39 outer wall
Mud cake all can be rinsed.
In one embodiment, body 11 being provided with the first valve 27 and the second valve 29, the first valve 27 can be controlled
Making the opening and closing of the first opening 19, the second valve 29 can control the opening and closing of the second opening 21.
In the present embodiment, when the mud cake on simulation wellbore hole 39 in needing body 11 is rinsed, can open
This first valve 27 and second valve 29, to open the first opening 19 and the second opening 21；When rinsing complete, can be closed this
First valve 27 and the second valve 29, to close the first opening 19 and the second opening 21.
In one embodiment, simulation wellbore hole 39 includes inner tube 45 and the simulation rock stratum 41 being arranged in inner tube 45, mould
Intending rock stratum 41 and have predetermined porosity, this predetermined porosity is identical with the porosity of the rock stratum of target wellbore.
In the present embodiment, the porosity of this simulation rock stratum 41 is identical with the porosity of the rock stratum of target wellbore, thus
Rock stratum in this true simulation wellbore hole 39 of simulation rock stratum 41 energy, so that when drilling fluid flows through in simulation from the hole of simulation rock stratum 41
Mud cake formed in the mud cake formed on the outer wall of rock stratum 41 and pit shaft is identical.
In one embodiment, simulation wellbore hole 39 includes the connector 35 removably connected with inner tube 45, connector 35
It is arranged in the first opening 19, in inner tube 45, is provided with through hole 43, be provided with in this connector 35 and be connected with through hole 43
Interface channel 37.
In the present embodiment, connector 35 is arranged in the first opening 19, can be that screw is fixed, bolt is fixed, weld
Connect fixing.Being provided with through hole 43 in this inner tube 45, this inner tube 45 is detachably connected with connector 35, thus this simulation wellbore hole
39 can be detachably connected with body 11.This removably connects can be threaded.It is provided with through in this connector 35
The interface channel 37 that hole 43 is connected；Such that it is able to inject Cementing in through hole 43 by this interface channel 37.Should
It is disposed with the eyelet being connected with through hole 43 on the sidewall of inner tube 45, thus drilling fluid can enter through hole 43 by this eyelet
In, to make mud cake on the outer wall of simulation wellbore hole 39.
As it is shown on figure 3, in one embodiment, a kind of Cementing of simulating that the present invention provides rinses the reality of mud cake
Experiment device includes: cementing device and test device；Cementing device includes cylinder 61 and the cement 63 being arranged in cylinder 61, cement
63, for after mud cake is rinsed, arrange that with simulation wellbore hole 39 wall of mud cake is mutually cementing, to form cement sheath；Test device can obtain
Take simulation wellbore hole 39 and depart from the active force of cement sheath.
In the present embodiment, this cement 63 is for after mud cake is rinsed, with the wall phase that simulation wellbore hole 39 arranges mud cake
Cementing, to form cement sheath, it is possible to achieve the practical situation of simulation well cementation.This test device can obtain simulation wellbore hole 39 and depart from water
The active force of mud ring, can according to this active force and simulation wellbore hole 39 and the contact area of cement sheath are calculated cementing by force
Degree, and the size of this cementing strength can characterize the cementing situation of cementing concrete 63 slurry and formation rock, so this cementing strength energy
For the foundation cemented the well as reality.
As shown in Figure 4, in the present embodiment, the invention provides and a kind of utilize above-mentioned simulation Cementing to rinse
The experimental technique of the experimental provision of mud cake, comprising:
S1: input aqueous water in the simulation rock stratum 41 of simulation wellbore hole 39, until the water content of simulation wellbore hole 39 no longer becomes
Only turn to, obtain the first mass of simulation wellbore hole 39.
In the present embodiment, inputting aqueous water in simulation wellbore hole 39 can be to be soaked in pit shaft by simulation wellbore hole 39
Water sample in a period of time so that water sample can enter in the hole of simulation wellbore hole 39.This period of time of this pretreatment refer to so that
Water sample can be well into the time in the hole of simulation rock stratum 41.The aqueous no longer change of this simulation wellbore hole 39 refers to, entering should
Water in simulation wellbore hole 39 hole and the aqueous phase etc. flowed out from this simulation wellbore hole 39 hole.Obtain the first matter of simulation wellbore hole 39
Amount, can be placed on simulation wellbore hole 39 on electronic scale and weigh.This first mass includes quality and the mould of simulation wellbore hole 39
Intend the quality of water in pit shaft 39 hole.This first mass is m1。
S2: arrange mud cake on the wall of simulation wellbore hole 39；Obtain the second mass of simulation wellbore hole 39.
In the present embodiment, the wall of simulation wellbore hole 39 is arranged mud cake, can be existed by the one that the present invention provides
Arrange on the outer wall of this simulation wellbore hole 39 that the experimental provision of mud cake is arranged, it is also possible to carry out cloth by high-temperature and high-pressure filter press
Put.Obtain the second mass of simulation wellbore hole 39, simulation wellbore hole 39 can be placed on electronic scale and weigh.This second mass
Including the quality of water in the quality of simulation wellbore hole 39, simulation wellbore hole 39 hole and the quality of the mud cake of making.This second mass is
m2。
S3: the mud cake on simulation wellbore hole 39 is rinsed；Obtain the 3rd mass of simulation wellbore hole 39；
In the present embodiment, the mud cake on simulation wellbore hole 39 is rinsed, the one that can be provided by the present invention
Simulation Cementing rinses the experimental provision of mud cake and is rinsed.Obtain the 3rd mass of simulation wellbore hole 39, can will simulate
Pit shaft 39 is placed on electronic scale and weighs.3rd mass includes in the quality of simulation wellbore hole 39, simulation wellbore hole 39 hole
The quality of remaining mud cake after the quality of water and flushing.3rd mass is m3。
S4: according to predetermined rule, according to the first mass, the second mass and the 3rd Mass Calculation flush efficiency.
In the present embodiment, this predetermined rule refers to flush efficiency
Wherein, m1It it is the first mass；m2It it is the second mass；m3It it is the 3rd mass.
This flush efficiency is used for characterizing developing result, it is thus possible to rush mud cake on well bore wall before instructing actual well cementation
Wash.
It should be understood that above description is to illustrate rather than to limit.By reading above-mentioned retouching
Stating, the many embodiments outside the example provided and many application will be the most all aobvious and easy
See.Therefore, the scope of this teaching should not determine with reference to foregoing description, but should with reference to aforementioned claim and this
The four corner of the equivalent that a little claim are had determines.Include specially for comprehensive purpose, all articles and reference
The disclosure of profit application and bulletin is all passed through with reference to being incorporated herein.Theme disclosed herein is omitted in aforementioned claim
Any face is not intended to abandon this body matter, also should not be considered as applicant and this theme is not thought of as disclosed Shen
Please the part of theme.
Claims (10)
1. simulating Cementing and rinse an experimental provision for mud cake, described simulation Cementing rinses the experiment dress of mud cake
Put for simulating the Cementing flushing to the mud cake on target wellbore wall, it is characterised in that comprising:
The body of hollow, its have back to top and bottom, wherein said bottom for closure end, described body is provided with
First opening and the second opening；
By described first opening be located in described internal and can be along the simulation wellbore hole moved radially of described body；
It is provided with through hole in described simulation wellbore hole；
Described mud cake can be arranged on the outer wall of described simulation wellbore hole；Annular it is formed with empty between described simulation wellbore hole and described body
Between；
When described Cementing flows into described annular space from described through hole and flows out from described second opening, described solid
Described mud cake can be rinsed by well prepad fluid；Or when described Cementing flows into described annular sky from described second opening
Between and when described through hole flows out, described mud cake can be rinsed by described Cementing.
Simulation Cementing the most according to claim 1 rinses the experimental provision of mud cake, it is characterised in that:
Described body includes having the cylinder of described bottom and have the lid on described top, described simulation wellbore hole and described lid
Fixing, described lid can be relative to described cylinder moving radially along described cylinder.
Simulation Cementing the most according to claim 2 rinses the experimental provision of mud cake, it is characterised in that comprising:
It is arranged at the projection on described lid outer wall, described projection is provided with the through slot radially extended；
It is movably arranged at the fixture in described through slot, when described lid relative to described cylinder along the footpath of described body
After movement, described fixture can fix described cylinder and described lid.
Simulation Cementing the most according to claim 1 rinses the experimental provision of mud cake, it is characterised in that: described second
The height of opening is higher than the peak of described mud cake.
Simulation Cementing the most according to claim 1 rinses the experimental provision of mud cake, it is characterised in that: described body
On be provided with the first valve and the second valve, described first valve can control the opening and closing of described first opening, described second valve
The opening and closing of described second opening can be controlled.
Simulation Cementing the most according to claim 1 rinses the experimental provision of mud cake, it is characterised in that: described simulation
Pit shaft includes inner tube and the simulation rock stratum being arranged in said inner tube, and described simulation rock stratum has predetermined porosity, described pre-
Fixed porosity is identical with the porosity of the rock stratum of described target wellbore.
Simulation Cementing the most according to claim 6 rinses the experimental provision of mud cake, it is characterised in that: described simulation
Pit shaft includes that the connector detachably connected with said inner tube, described connector are arranged in described first opening, described interior
It is provided with described through hole in pipe, in described connector, is provided with the interface channel being connected with described through hole.
Simulation Cementing the most according to claim 1 rinses the experimental provision of mud cake, it is characterised in that comprising:
Cementing device and test device；Described cementing device includes cylinder and the cement being arranged in described cylinder, and described cement is used for
After described mud cake is rinsed, mutually cementing with the outer wall of described simulation wellbore hole, to form cement sheath；Described test device can obtain
Described simulation wellbore hole departs from the active force of described cement sheath.
9. utilize in claim 1 to 8 simulation Cementing described in any claim to rinse the experimental provision of mud cake
Experimental technique, it is characterised in that comprising:
Aqueous water is inputted, till the water content of described simulation wellbore hole no longer changes to the simulation rock stratum of described simulation wellbore hole；
Obtain the first mass of described simulation wellbore hole；
The outer wall of described simulation wellbore hole is arranged described mud cake；
Obtain the second mass of described simulation wellbore hole；
Mud cake on described simulation wellbore hole is rinsed；
Obtain the 3rd mass of described simulation wellbore hole；
According to predetermined rule, according to described first mass, described second mass and described 3rd Mass Calculation flush efficiency.
Simulation Cementing the most according to claim 9 rinses the experimental technique of the experimental provision of mud cake, and its feature exists
In:
Described according to predetermined rule, rinse effect according to described first mass, described second mass and described 3rd Mass Calculation
Rate calculates according to the following equation:
Wherein, m1It it is the first mass；m2It it is the second mass；m3It it is the 3rd mass.
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| CN201610849503.5A CN106285526B (en) | 2016-09-23 | 2016-09-23 | Simulate experimental provision and experimental method that Cementing rinses mud cake |
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