CN106285526B - Simulate experimental provision and experimental method that Cementing rinses mud cake - Google Patents
Simulate experimental provision and experimental method that Cementing rinses mud cake Download PDFInfo
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- CN106285526B CN106285526B CN201610849503.5A CN201610849503A CN106285526B CN 106285526 B CN106285526 B CN 106285526B CN 201610849503 A CN201610849503 A CN 201610849503A CN 106285526 B CN106285526 B CN 106285526B
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- simulation
- mud cake
- cementing
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- wellbore hole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The present invention provides the experimental provision and experimental method of a kind of simulation Cementing flushing mud cake, the simulation Cementing rinses the experimental provision of mud cake for simulating flushing of the Cementing to the mud cake on target wellbore wall, comprising: hollow ontology, its have mutually by back to top and bottom end, wherein bottom end is to block end, is provided with the first opening and the second opening on ontology；It is threaded through in ontology and can be along the simulation wellbore hole of ontology moved radially by the first opening；Through hole is provided in simulation wellbore hole；Mud cake can be arranged on the outer wall of simulation wellbore hole；The second annular space is formed between simulation wellbore hole and ontology；When Cementing flows into the second annular space and flow out from the second opening from through hole, Cementing can be rinsed mud cake.The present invention, which realizes, provides a kind of purpose of the experimental provision of simulation Cementing flushing mud cake of energy real simulation process that practical mud cake rinses.
Description
Technical field
The present invention relates to the experiments that oil gas well cementing operation technical field more particularly to a kind of simulation Cementing rinse mud cake
Device and experimental method.
Background technique
During oil gas well drilling, under the action of pressure difference, hole from Free water in drilling fluid to rock of borehole or
The phenomenon that being permeated in gap, referred to as the leak-off effect of drilling fluid.As drilling fluid is in the leak-off of the borehole wall, Free water enters stratum,
Solid phase particles in drilling fluid, which are just attached on the borehole wall, forms mud cake.
Well cementation is the tripping in casing into well, and is made to the construction of the first annular space injection cement between wellbore and casing
Industry.Since well cementation is in the first annular space of casing and the borehole wall to inject cement, so drilling fluid is consolidated in drilling process
The mud cake that phase particle is formed on the borehole wall can be mixed between cement slurry and stratum, to make to the bonding quality of well cementation second interface
At influence.
In order to improve well cementation interface agglutination quality, extends oil/gas well Production Life, need the forward direction well in cementing
It injects one section of liquid in first annular space between wall and casing to clean the borehole wall and casing, referred to as prepad fluid.Through
Years of researches are crossed, achieve significant progress in terms of prepad fluid both at home and abroad, but are directed to the flushing effect of prepad fluid,
It there is no the practice and standard of scientific unity both at home and abroad at present, this also becomes one of obstruction Cementing technological progress mainly
Factor.
Chinese invention patent application CN104675345A discloses a kind of " Cementing flush efficiency engineering simulation quantization
Evaluating apparatus and method ".The Cementing flush efficiency engineering simulation quantitatively evaluating device includes bracket, Support tray, artificial
Rock core, core holding unit, variable speed electric motors, particularly, mass sensor, computer acquisition terminal have height adjustment fixture on the bracket,
The slurry cup for containing Cementing is placed on the Support tray, the height adjustment fixture is sequentially connected mass sensor, speed change
Motor and core holding unit, the core holding unit are connected with motor by the fixed artificial core of fastening screw, the variable speed electric motors, particularly
Speed regulator, the mass sensor are connected with computer acquisition terminal.The Cementing flush efficiency stage die analog quantity
Although the mud cake on artificial core can be rinsed by changing evaluating apparatus, which is before artificial core is located at well cementation
It sets in liquid, is rinsed by rotation artificial core, and in actual well cementing operation, the mud cake on the borehole wall is to cement the well
Prepad fluid injects in the first annular space between the borehole wall and casing, and is rinsed during being discharged by casing, and covers
Pipe usually has certain degree of eccentricity in the wellbore of oil well, so Cementing has the mud cake of different zones on the borehole wall
Different flushing effects, and the Cementing of device flushing effect having the same to the mud cake of different zones on artificial core
Fruit, so the process that the device does not have the practical mud cake of real simulation to rinse, to affect the authenticity for rinsing result.
Summary of the invention
The object of the present invention is to provide the simulation Cementing punchings for the process that a kind of practical mud cake of energy real simulation rinses
Wash the experimental provision and experimental method of mud cake.
Following technical proposal can be used to realize in above-mentioned purpose of the invention: a kind of simulation Cementing rinses mud cake
Experimental provision, the simulation Cementing rinse the experimental provision of mud cake for simulating Cementing to target wellbore wall
Mud cake flushing comprising: hollow ontology, have mutually by back to top and bottom end, wherein the bottom end be block
It holds, is provided with the first opening and the second opening on the ontology；It is threaded through in the ontology by first opening and can edge
The simulation wellbore hole of the ontology moved radially；Through hole is provided in the simulation wellbore hole；On the outer wall of the simulation wellbore hole
It can arrange the mud cake；The second annular space is formed between the simulation wellbore hole and the ontology；When the Cementing
When flowing into second annular space from the through hole and flow out from second opening, the Cementing can be to described
Mud cake is rinsed；Or when the Cementing flows into second annular space from second opening and passes through from described
When through-hole flows out, the Cementing can be rinsed the mud cake；Shell；The simulation wellbore hole can be arranged in the shell
In vivo, so as to which third annular space can be formed between the outer wall of the simulation wellbore hole and the inner wall of the shell；The simulation
Pit shaft includes the simulation rock stratum with hole, and the hole can be connected to the third annular space and the through hole, and described
For injecting drilling fluid, the drilling fluid can flow under the effect of the pressure in the through hole three annular spaces, with can be in institute
It states and forms the mud cake on the outer wall of simulation rock stratum.
As a preferred embodiment, the ontology includes having the cylinder of the bottom end and with the top
Lid, the simulation wellbore hole are mutually fixed with the lid, and the lid can be moved relative to the cylinder along the radial direction of the ontology
It is dynamic.
As a preferred embodiment, being set in the protrusion comprising: be set to the protrusion on the lid outer wall
It is equipped with the through slot radially extended；The fixing piece being movably arranged in the through slot, when the lid is relative to institute
Cylinder is stated after the moving radially of the ontology, the fixing piece is capable of fixing the cylinder and the lid.
As a preferred embodiment, the height of second opening is higher than the highest point of the mud cake.
As a preferred embodiment, the first valve and the second valve are provided on the ontology, first valve
Door can control the opening and closing of first opening, and second valve can control the opening and closing of second opening.
As a preferred embodiment, the simulation wellbore hole includes inner tube and the simulation rock that is arranged in said inner tube
Layer, the simulation rock stratum have scheduled porosity, the porosity of the scheduled porosity and the rock stratum of the target wellbore
It is identical.
As a preferred embodiment, the simulation wellbore hole includes the connection detachably connected with said inner tube
Part, the connector are arranged in first opening, and the through hole, setting in the connector are provided in said inner tube
There is the interface channel being connected with the through hole.
As a preferred embodiment, comprising: cementing device and test device；The cementing device includes cylinder
Be set to the intracorporal cement of the column, the cement is for the outer wall after mud cake is rinsed, with the simulation wellbore hole
It is mutually cementing, to form cement sheath；The test device can obtain the active force that the simulation wellbore hole is detached from the cement sheath.
The experimental method of the experimental provision of mud cake is rinsed using above-mentioned simulation Cementing comprising: Xiang Suoshu mould
The simulation rock stratum of quasi- pit shaft inputs liquid water, until the water content of the simulation wellbore hole no longer changes；Obtain the simulation
First mass of pit shaft；The mud cake is arranged on the outer wall of the simulation wellbore hole；Obtain the second mass of the simulation wellbore hole；
Mud cake on the simulation wellbore hole is rinsed；Obtain the third quality of the simulation wellbore hole；According to scheduled rule, according to
Flush efficiency described in first mass, second mass and the third Mass Calculation.
As a preferred embodiment, the pre-defined rule is flush efficiencyWherein, m1It is first
Quality；m2For the second mass；m3For third quality.
A kind of beneficial effect of experimental provision that simulation Cementing rinses mud cake provided by the invention is: the present invention is set
Setting can be along the simulation wellbore hole of ontology moved radially, so as to by moving radially simulation wellbore hole, to reach real simulation oil
The degree of eccentricity of well middle sleeve in the wellbore is provided with through hole in the simulation wellbore hole, when Cementing flows into the from through hole
Second ring space and from second opening outflow when, Cementing can be rinsed mud cake；Or when Cementing is from the
When two openings flow into the second annular space and flow out from through hole, Cementing can be rinsed the mud cake, so as to
The process that the practical mud cake of true reappearance rinses.There are the degree of eccentricitys by the practical mud cake flushing process middle sleeve of real simulation by the present invention
The case where and the process rinsed of the practical mud cake of true reappearance, realize provide it is a kind of can the process rinsed of the practical mud cake of real simulation
Simulation Cementing rinse mud cake experimental provision purpose.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached 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 schematic diagram of the experimental provision for the arrangement mud cake that Fig. 2 one embodiment of the present invention provides；
The structural schematic diagram for 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 method of mud cake.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1.The present invention provides a kind of experimental provision of simulation Cementing flushing mud cake, the simulation well cementation
The experimental provision of preflush mud cake is for simulating flushing of the Cementing to the mud cake on target wellbore wall comprising:
Hollow ontology 11, have mutually by back to top 13 and bottom end 15, wherein the bottom end 15 be block end, the ontology 11
On be provided with the first opening 19 and the second opening 21；It is threaded through in the ontology 11 and can be along described by first opening 19
The simulation wellbore hole 39 of ontology 11 moved radially；Through hole 43 is provided in the simulation wellbore hole 39；The simulation wellbore hole 39
The mud cake can be arranged on outer wall；The second annular space 17 is formed between the simulation wellbore hole 39 and the ontology 11；Work as institute
State Cementing from the through hole 43 flow into second annular space 17 and from it is described second opening 21 outflow when, it is described
Cementing can be rinsed the mud cake；Or when the Cementing flows into described the from second opening 21
Second ring space 17 and from the through hole 43 flow out when, the Cementing can be rinsed the mud cake.
The experimental provision setting that a kind of simulation Cementing provided by the invention rinses mud cake can be along the radial direction of ontology 11
Mobile simulation wellbore hole 39, so as to by moving radially simulation wellbore hole 39, to reach real simulation oil well middle sleeve in well
The degree of eccentricity in eye is provided with through hole 43 in the simulation wellbore hole 39, when Cementing flows into the second annular from through hole 43
Space 17 and from second opening 21 outflow when, Cementing can be rinsed mud cake；Or work as Cementing from second
When opening 21 flows into the second annular space 17 and flows out from through hole 43, Cementing can be rinsed mud cake, so as to
The process that the practical mud cake of true reappearance rinses.There are the degree of eccentricitys by the practical mud cake flushing process middle sleeve of real simulation by the present invention
The case where and the process rinsed of the practical mud cake of true reappearance, realize provide it is a kind of can the process rinsed of the practical mud cake of real simulation
Simulation Cementing rinse mud cake experimental provision purpose.
As shown in Figure 1, in the present embodiment, a kind of experiment of simulation Cementing flushing mud cake provided by the invention
Device is for simulating flushing of the Cementing to the mud cake on target wellbore wall, with the mistake of the practical mud cake flushing of energy real simulation
Journey.The target wellbore refers to the pit shaft for needing practical oil well to be simulated.The experimental provision packet of simulation Cementing flushing mud cake
It includes: hollow ontology 11.The ontology 11 is for rinsing mud cake.The ontology 11 have mutually by back to top 13 and bottom end 15,
Middle bottom end 15 is to block end, and the first opening 19 and the second opening 21 are provided on the ontology.
In the present embodiment, it is provided with the first opening 19 in the ontology 11 and is arranged in simulation wellbore hole 39 therein.
The simulation wellbore hole 39 is used to simulate the borehole wall of practical oil well, so as to carry out in ontology 11 to the mud cake on the simulation wellbore hole 39
It rinses.The simulation wellbore hole 39 can moving radially along ontology 11, so as to by moving radially simulation wellbore hole 39, to reach true
The degree of eccentricity of real simulation oil well middle sleeve in the wellbore.It is provided with through hole 43 in the simulation wellbore hole 39, which can be with
Cementing is set to circulate.
In the present embodiment, the second annular space 17 is formed between the simulation wellbore hole 39 and ontology 11.The simulation well
Mud cake can be arranged on the outer wall of cylinder 39；When Cementing from through hole 43 flow into the second annular space 17 and from second opening 21
When outflow, Cementing can be rinsed mud cake；Or when Cementing flows into the second annular sky from the second opening 21
Between 17 and when being flowed out from through hole 43, Cementing can be rinsed mud cake, rinse so as to the practical mud cake of true reappearance
Process.The present invention by the practical mud cake flushing process middle sleeve of real simulation there are the degree of eccentricitys the case where and true reappearance it is practical
The process that mud cake rinses realizes and provides a kind of simulation Cementing flushing of energy real simulation process that practical mud cake rinses
The purpose of the experimental provision of mud cake.
As shown in Fig. 2, in the present embodiment, the present invention provides a kind of to arrange mud on the outer wall of the simulation wellbore hole 39
The experimental provision of cake comprising: shell 53；The shell 53 is for accommodating simulation wellbore hole 39, on the outer wall of simulation wellbore hole 39
Arrange mud cake.The simulation wellbore hole 39 is set in the shell 53, is formed between the outer wall of simulation wellbore hole 39 and the inner wall of shell 53
There is third annular space 59；The third annular space 59 can inject drilling fluid.The simulation wellbore hole 39 includes the simulation with hole
Rock stratum 41, the porosity communication third annular space 59 and through hole 43, when drilling fluid flows into through hole from third annular space 59
When 43, drilling fluid can form mud cake on the outer wall of simulation rock stratum 41.
In the present embodiment, which includes opposite facing first end face 47 and second end face 49, first end
Face 47 and second end face 49 are engaged with the inner wall of shell 53, so that the drilling fluid in the third annular space 59 cannot be from mould
The end face of quasi- pit shaft 39 passes through, to ensure that mud cake can only be arranged on the outer wall of simulation wellbore hole 39.Specifically, the shell 53
It is inside provided with the choking portion 51 that can be matched with first end face 47, is provided with pad between the first end face 47 and the choking portion 51
Piece is provided with gasket between the second end face 49 and the inner wall of shell 53.
In the present embodiment, the centerline collineation of the center line of simulation wellbore hole 39 and shell 53, so that mud cake can be uniformly
It is arranged on the outer wall of the simulation wellbore hole 39.
In the present embodiment, it is provided with the first aperture 55 being connected with through hole 43 on shell 53, is set on shell 53
The second aperture 57 being connected with third annular space 59 is set, the second aperture 57 is used to have drilling fluid in third annular space 59
When, it pressurizes to drilling fluid, so that drilling fluid flows into through hole 43 from third annular space 59, thus in simulation wellbore hole 39
Outer wall on form mud cake.
In one embodiment, ontology 11 includes the cylinder 23 with bottom end 15 and the lid 25 with top 13, mould
Quasi- pit shaft 39 is fixed with 25 phase of lid, and lid 25 can be relative to the moving radially along ontology 11 of cylinder 23.
In the present embodiment, when the lid 25 relative to cylinder 23 moving radially along ontology 11, with 25 phase of lid
The simulation wellbore hole 39 of connection also can be relative to the moving radially along ontology 11 of cylinder 23, so as to adjust simulation wellbore hole 39 in ontology
The degree of eccentricity in 11, with the degree of eccentricity of simulation oil well middle sleeve in the wellbore.
In one embodiment, ontology 11 includes the cylinder 23 with bottom end 15 and the lid 25 with top 13, mould
Quasi- pit shaft 39 is fixed with 25 phase of lid, and lid 25 can be relative to the moving radially along ontology 11 of cylinder 23.
In one embodiment, the top of ontology 11 is provided with limiting device, which is fixedly connected on this
On limiting device.The limiting device includes the multiple limiting sections radially extended along ontology, and multiple limiting section simulates well for making
39 moving radially along ontology 11 of cylinder, so as to adjust the degree of eccentricity of the simulation wellbore hole 39 in ontology 11, to be covered in simulation oil well
The degree of eccentricity of pipe in the wellbore.Multiple limiting section can be threaded hole, which can be with spiral shell fixed on the simulation wellbore hole
Nail is threadedly coupled.
In the present embodiment, a kind of experiment dress for arranging mud cake on the outer wall of the simulation wellbore hole 39 provided by the invention
Setting includes: the protrusion 31 being set on 25 outer wall of lid, is provided with the through slot radially extended in protrusion 31；Movably set
The fixing piece 33 being placed in through slot, when lid 25 relative to cylinder 23 along ontology 11 after moving radially, fixing piece 33 can be solid
Safety barrel body 23 and lid 25.
In one embodiment, which can be bolt, and the through slot which can radially extend is mobile,
When lid 25 relative to cylinder 23 along ontology 11 after moving radially, which can be bolted with lid 25.
As shown in Figure 1, in one embodiment, the height of the second opening 21 is higher than the highest point of mud cake.
In the present embodiment, the highest point of the mud cake refers to the 39 highest mud cake of outer wall upper position of simulation wellbore hole, second
The height of opening 21 is higher than the highest point of mud cake, it is ensured that when Cementing flows into the second annular space 17 from through hole 43
And from when the second 21 outflow of opening, which can be full of in the second annular space, so that on 39 outer wall of simulation wellbore hole
Mud cake can be rinsed.
In one embodiment, the first valve 27 and the second valve 29 are provided on ontology 11, the first valve 27 can be controlled
The opening and closing of the first opening 19 of system, the second valve 29 can control the opening and closing of the second opening 21.
In the present embodiment, it when needing to be rinsed the mud cake in ontology 11 on simulation wellbore hole 39, can open
First valve 27 and the second valve 29, to open the first opening 19 and the second opening 21；When flushing finishes, this can be closed
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
Quasi- rock stratum 41 has scheduled porosity, and the scheduled porosity is identical as the porosity of the rock stratum of target wellbore.
In the present embodiment, the porosity of rock stratum of porosity and target wellbore of the simulation rock stratum 41 is identical, thus
Rock stratum in the 41 energy real simulation pit shaft 39 of simulation rock stratum, so as to simulated when drilling fluid is flowed through from the hole of simulation rock stratum 41
It is identical as mud cake formed in pit shaft that mud cake is formed by the outer wall of rock stratum 41.
In one embodiment, simulation wellbore hole 39 includes the connector 35 being detachably connected with inner tube 45, connector 35
It is arranged in the first opening 19, through hole 43 is provided in inner tube 45, be provided in the 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, is welded
Connect fixation.It is provided with through hole 43 in the inner tube 45, the inner tube 45 and connector 35 are detachably connected, thus the simulation wellbore hole
39 can be detachably connected with ontology 11.This, which is detachably connected, to be threaded connection.It is provided with and penetrates through in the connector 35
The interface channel 37 that hole 43 is connected；So as to inject Cementing into through hole 43 by the interface channel 37.It should
The eyelet being connected with through hole 43 is disposed on the side wall of inner tube 45, so that drilling fluid can enter through hole 43 by the eyelet
It is interior, to make mud cake on the outer wall of simulation wellbore hole 39.
As shown in figure 3, in one embodiment, a kind of reality of simulation Cementing flushing mud cake provided by the invention
Experiment device includes: cementing device and test device；Cementing device includes cylinder 61 and the cement 63 that is set in cylinder 61, cement
63 for arranging that the wall of mud cake is mutually cementing with simulation wellbore hole 39, to form cement sheath after mud cake is rinsed；Test device can obtain
Simulation wellbore hole 39 is taken to be detached from the active force of cement sheath.
In the present embodiment, which is used for after mud cake is rinsed, and the wall phase of mud cake is arranged with simulation wellbore hole 39
It is cementing, to form cement sheath, the actual conditions of simulation well cementation may be implemented.The test device can obtain simulation wellbore hole 39 and be detached from water
The active force of mud ring, can be cementing strong according to the contact area of the active force and simulation wellbore hole 39 and cement sheath to be calculated
Degree, and the size of the cementing strength can characterize the cementing situation of cementing concrete 63 slurry and formation rock, so the cementing strength energy
For as the foundation actually cemented the well.
As shown in figure 4, in the present embodiment, utilizing above-mentioned simulation Cementing flushing the present invention provides a kind of
The experimental method of the experimental provision of mud cake comprising:
S1: inputting liquid water into the simulation rock stratum 41 of simulation wellbore hole 39, until the water content of simulation wellbore hole 39 no longer becomes
It turns to only, obtains the first mass of simulation wellbore hole 39.
In the present embodiment, liquid water is inputted into simulation wellbore hole 39 can be simulation wellbore hole 39 is soaked in pit shaft
Water sample in a period of time so that water sample can enter in the hole of simulation wellbore hole 39.The pretreatment this refer to for a period of time so that
Water sample can be well into the time in the hole of simulation rock stratum 41.The aqueous no longer variation of the simulation wellbore hole 39 refers to, into this
Water in 39 hole of simulation wellbore hole and the water phase etc. flowed out from 39 hole of simulation wellbore hole.Obtain the first matter of simulation wellbore hole 39
Amount, simulation wellbore hole 39 can be placed on electronic scale and be weighed.First mass includes the quality and mould of simulation wellbore hole 39
The quality of water in quasi- 39 hole of pit shaft.First mass is m1。
S2: mud cake is arranged on the wall of simulation wellbore hole 39；Obtain the second mass of simulation wellbore hole 39.
In the present embodiment, mud cake is arranged on the wall of simulation wellbore hole 39, the one kind that can be provided through the invention exists
Arrange that the experimental provision of mud cake is arranged, and can also carry out cloth by high-temperature and high-pressure filter press on the outer wall of the simulation wellbore hole 39
It sets.The second mass for obtaining simulation wellbore hole 39, simulation wellbore hole 39 can be placed on electronic scale and be weighed.Second mass
The quality of the mud cake of the quality and production of water in quality, 39 hole of simulation wellbore hole including simulation wellbore hole 39.Second mass is
m2。
S3: the mud cake on simulation wellbore hole 39 is rinsed；Obtain the third quality of simulation wellbore hole 39；
In the present embodiment, the mud cake on simulation wellbore hole 39 is rinsed, the one kind that can be provided through the invention
The experimental provision that simulation Cementing rinses mud cake is rinsed.The third quality for obtaining simulation wellbore hole 39, can will simulate
Pit shaft 39 is placed on electronic scale and is weighed.The third quality includes the quality of simulation wellbore hole 39, in 39 hole of simulation wellbore hole
The quality of remaining mud cake after the quality and flushing of water.The third quality is m3。
S4: according to scheduled rule, according to the first mass, the second mass and third Mass Calculation flush efficiency.
In the present embodiment, which refers to flush efficiency
Wherein, m1For the first mass；m2For the second mass；m3For third quality.
The flush efficiency is for characterizing flushing effect, so as to for rushing before instructing practical well cementation to mud cake on well bore wall
It washes.
It should be understood that above description is to illustrate rather than to be limited.By reading above-mentioned retouch
It states, many embodiments and many applications except provided example all will be aobvious and easy for a person skilled in the art
See.Therefore, the range of this introduction should not be determined referring to foregoing description, but should referring to preceding claims and this
The full scope of the equivalent that a little claims are possessed determines.For comprehensive purpose, all articles and with reference to including special
The disclosure of benefit application and bulletin is all by reference to being incorporated herein.Theme disclosed herein is omitted in preceding claims
Any face is not intended to abandon the body matter, also should not be considered as applicant and the theme is not thought of as to disclosed Shen
Please theme a part.
Claims (10)
1. a kind of simulation Cementing rinses the experimental provision of mud cake, the simulation Cementing rinses the experiment dress of mud cake
Set the flushing for simulating Cementing to the mud cake on target wellbore wall, characterized in that it comprises:
Hollow ontology is provided on the ontology with opposite facing top and bottom end wherein the bottom end is to block end
The first opening and the second opening；
It is threaded through in the ontology and can be along the simulation wellbore hole of the ontology moved radially by first opening；
Through hole is provided in the simulation wellbore hole；
The mud cake can be arranged on the outer wall of the simulation wellbore hole；Annular sky is formed between the simulation wellbore hole and the ontology
Between；
It is described solid when the Cementing flows into the annular space and flow out from second opening from the through hole
Well prepad fluid can be rinsed the mud cake；Or when the Cementing flows into the annular sky from second opening
Between and from the through hole flow out when, the Cementing can be rinsed the mud cake；
Shell；The simulation wellbore hole can be arranged in the shell, so that the outer wall of the simulation wellbore hole and the shell is interior
Third annular space can be formed between wall；The simulation wellbore hole includes the simulation rock stratum with hole, and the hole can be connected to
The third annular space and the through hole, for injecting drilling fluid, the drilling fluid can press the third annular space
It is flowed under the action of power in the through hole, the mud cake can be formed on the outer wall of the simulation rock stratum.
2. the experimental provision that simulation Cementing according to claim 1 rinses mud cake, it is characterised in that:
The ontology includes the cylinder with the bottom end and the lid with the top, the simulation wellbore hole and the lid
Mutually fixed, the lid can be relative to the cylinder moving radially along the cylinder.
3. the experimental provision that simulation Cementing according to claim 2 rinses mud cake, characterized in that it comprises:
The protrusion being set on the lid outer wall, it is described protrusion on be provided with the through slot radially extended；
The fixing piece being movably arranged in the through slot, when the lid relative to the cylinder along the diameter of the ontology
To after movement, the fixing piece is capable of fixing the cylinder and the lid.
4. the experimental provision that simulation Cementing according to claim 1 rinses mud cake, it is characterised in that: described second
The height of opening is higher than the highest point of the mud cake.
5. the experimental provision that simulation Cementing according to claim 1 rinses mud cake, it is characterised in that: the ontology
On be provided with the first valve and the second valve, first valve can control the opening and closing of first opening, second valve
It can control the opening and closing of second opening.
6. the experimental provision that simulation Cementing according to claim 1 rinses mud cake, it is characterised in that: the simulation
Pit shaft includes inner tube and the simulation rock stratum that is arranged in said inner tube, and the simulation rock stratum is described pre- with scheduled porosity
Fixed porosity is identical as the porosity of the rock stratum of the target wellbore.
7. the experimental provision that simulation Cementing according to claim 6 rinses mud cake, it is characterised in that: the simulation
Pit shaft includes the connector detachably connected with said inner tube, and the connector is arranged in first opening, described interior
It is provided with the through hole in pipe, the interface channel being connected with the through hole is provided in the connector.
8. the experimental provision that simulation Cementing according to claim 1 rinses mud cake, characterized in that it comprises:
Cementing device and test device；The cementing device includes cylinder and is set to the intracorporal cement of the column, and the cement is used for
It is mutually cementing with the outer wall of the simulation wellbore hole after mud cake is rinsed, to form cement sheath；The test device can obtain
The simulation wellbore hole is detached from the active force of the cement sheath.
9. rinsing the experimental provision of mud cake using simulation Cementing described in any claim in claim 1 to 8
Experimental method, characterized in that it comprises:
Liquid water is inputted to the simulation rock stratum of the simulation wellbore hole, until the water content of the simulation wellbore hole no longer changes；
Obtain the first mass of the simulation wellbore hole；
The mud cake is arranged on the outer wall of the simulation wellbore hole；
Obtain the second mass of the simulation wellbore hole；
Mud cake on the simulation wellbore hole is rinsed；
Obtain the third quality of the simulation wellbore hole；
According to scheduled rule, according to first mass, second mass and the third Mass Calculation flush efficiency.
10. simulation Cementing according to claim 9 rinses the experimental method of the experimental provision of mud cake, feature exists
In:
It is described according to scheduled rule, rinsed and imitated according to first mass, second mass and the third Mass Calculation
Rate calculates according to the following equation:
Wherein, m1For the first mass；m2For the second mass；m3For third quality.
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| CN110658094B (en) * | 2018-06-29 | 2022-08-30 | 中国石油天然气股份有限公司 | Evaluation system and evaluation method for cleaning effect of slurry cleaning liquid |
| CN113882852A (en) * | 2020-06-18 | 2022-01-04 | 中国石油天然气集团有限公司 | Well cementation pad fluid flushing efficiency evaluation device and evaluation method |
| CN111734405B (en) * | 2020-06-29 | 2023-07-07 | 中国石油天然气集团有限公司 | Device for improving accuracy of mud cake flushing efficiency by pad fluid in well cementation |
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