CN104863533B - Evaluation device and method of well cementation flushing efficiency - Google Patents
Evaluation device and method of well cementation flushing efficiency Download PDFInfo
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- CN104863533B CN104863533B CN201510188225.9A CN201510188225A CN104863533B CN 104863533 B CN104863533 B CN 104863533B CN 201510188225 A CN201510188225 A CN 201510188225A CN 104863533 B CN104863533 B CN 104863533B
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- wellbore hole
- simulation wellbore
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- 238000011010 flushing procedure Methods 0.000 title abstract description 50
- 238000000034 method Methods 0.000 title abstract description 34
- 238000011156 evaluation Methods 0.000 title abstract description 16
- 239000012065 filter cake Substances 0.000 claims abstract description 32
- 239000008236 heating water Substances 0.000 claims abstract description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000006004 Quartz sand Substances 0.000 claims abstract description 15
- 238000004088 simulation Methods 0.000 claims description 82
- 239000007788 liquid Substances 0.000 claims description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 239000004744 fabric Substances 0.000 claims description 9
- 230000008676 import Effects 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 2
- 239000011796 hollow space material Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 abstract description 32
- 238000013461 design Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 239000011083 cement mortar Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000309551 Arthraxon hispidus Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241001411320 Eriogonum inflatum Species 0.000 description 1
- 230000004520 agglutination Effects 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000004094 surface-active agent 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)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides an evaluation device and method of well cementation flushing efficiency. Designed according to the Reynolds number equality theory, the device comprises a simulated well casing, a heating water tank, a power pump and an electromagnetic flowmeter, wherein the simulated well casing mainly comprises an inner barrel and an outer barrel; the inner barrel comprises an inner barrel body, steel screen meshes with different mesh numbers and an inner barrel end cover; the inner barrel can simulate a stratum under the circumstance that the steel screen meshes are covered with filter paper or the inner barrel is filled with quartz sand; the outer barrel can rotate; guide vanes with different forms are designed to simulate a casing pipe. The method is easy to operate, high in comparability and low in workload, can effectively form a filter cake, simulate and evaluate the characteristics of the flushing efficiency under the circumstance that the casing pipe rotates or a spiral centralizer is used, can evaluate the flushing efficiency of flushing fluid for a first interface and a second interface, can evaluate and optimally select the flushing fluid system and design the dosage of the flushing fluid, and is wide in application.
Description
Technical field
The present invention relates to oil gas well cementing operation field, more particularly to a kind of well cementation flush efficiency evaluating apparatus and evaluation methodology.
Background technology
Well cementation flushing liquor is typically surfactant etc. is added in water or is formed with drilling fluid dilution mixture.Can with isolate
Liquid is used simultaneously, but before being located at insulating liquid.The main purpose of flushing liquor be clean the borehole wall and casing wall adhesion drilling fluid and
Filter cake, improves well cementation interface cementing strength.When well is crept into, the filter cake of Bao Erren and densification is formed on the easy borehole wall of drilling fluid,
Effective control drilling fluid filtration, reduces drilling engineering complex accident.But in well cementation, the drilling well of the borehole wall and casing wall residual
Liquid and filter cake can prevent cement mortar and borehole wall directly contact, and are further dehydrated in cement mortar aquation, dry up or powder
Change phenomenon, easily microannulus is formed in bore hole annulus interface, so as to reduce interface second contact surface cementing strength, have a strong impact on well cementation
Quality, or even cause oil gas water channeling.Well cementation second interface problem is always one difficult problem of long-standing problem casing and cementing, its serious system
About oil and gas exploration and developments.Therefore the flush efficiency to drilling fluid and filter cake is effectively improved, being that cement mortar is cementing carries
Favourable environment is cleaned for one, is to improve interface cementing strength, it is ensured that the committed step of cementing quality.Flushing liquor to the borehole wall and
The cleaning efficiency of the drilling fluid and filter cake of casing wall adhesion will be directly connected to success or not and the cementing quality height of well cementation, most
Be related to Oil/gas Well service life and productivity effect eventually, serial well stimulation can be successfully carried out to the Oil/gas Well later stage also has pole
Its great impact.
The flush efficiency evaluation methodology for being adopted at this stage mainly has 5 kinds, respectively conical flask method, drilling cuttings post method, large-scale
Simulation wellbore hole method, rotating cylinder viscometer method, lab simulation well bore evaluation device etc..
Conical flask method：Conical flask method is using relatively early, relatively simple but also simpler and cruder.Concrete operation step is：
10mL drilling fluids are put into conical flask, are subsequently adding a certain amount of flushing liquor, cover bottle stopper, shake 30 seconds, mixing is poured out from bottle
Thing, observes flushing situation.This method use is very easy, but has distinct disadvantage, and its measurement result affected by various factors is not
Accurately, the control of strength size is as a result largely rocked, and is rocked strength size and cannot be ensured to unify, it is repeatable
Difference, can only simply be observed to flushing situation, and on-the-spot guidance is poor, now using less.
Drilling cuttings post method：500g drilling cuttings is weighed, with mud soak, is made on drilling cuttings, to adhere to certain thickness drilling fluid, is then filled
In glass infuser, allow flushing liquor drilling cuttings to be flow through with certain speed, which is rinsed, weigh the quality for rinsing out, calculate and rinse
Efficiency.Relative to conical flask method, this method makes great progress, and flush efficiency simply can be calculated, but still
Inaccurate, whole experiment process is not enough improved and complex operation.
Large-scale simulation wellbore hole method：Down-hole is simulated by setting up large-scale simulation wellbore hole device and rinses displacement process, but this
Kind of method can not intuitively observe evaluations to actual developing result, and test, equipment it is larger, each side requirement is higher,
Be not suitable for carrying out laboratory performance evaluation.
Rotating cylinder viscometer method：The method is to be stained with certain thickness drilling fluid in rotating cylinder viscometer outer tube, and one is equipped with cup
Quantitative flushing liquor, setting speed, generally 200r/min, spin rinse certain hour observe developing result.The method can be right
Developing result is intuitively observed, but is unable to quantitatively characterizing flush efficiency, and flushing process there is also with actual condition it is larger
Gap.Therefore, on-the-spot guidance meaning not very big.Chinese utility model patent " well cementation flushing liquor flush efficiency quantitative simulation
Evaluating apparatus " (CN203161216U), improve viscometer method, but the experimental situation of device can only be normal temperature and pressure, same to fashionable dress
Put effect assessment can not be rinsed to drilling fluid filter cake.
Lab simulation well bore evaluation device：The borehole wall is simulated using artificial sandstone, flush efficiency evaluation experimental is in dynamic analog
Carry out in intending pit shaft, in pit shaft, have analog casing and the simulation borehole wall.Be full of initially with drilling fluid and pit shaft pressurize, drilling fluid to
Borehole wall dehydration forms filter cake.Then replaced with flushing liquor and rinse drilling fluid, reached and stop certain time of contact replacing, adopt
Weight method calculates flush efficiency, has certain directive significance to scene.Such as article " high-temperature high-pressure clay cake agglutination simulating-estimating system
The development of system and application " (《Oil instrument》The 37-40 page of the 1st phase of volume 22 in 2008) develop a kind of high-temperature high-pressure clay cake glue
Knot simulation and evaluation system, the mud cake quality that wall building under the conditions of various can be formed, affect cementing slurry bonding quality because
Element carries out more careful research；Article " a kind of evaluation methodology of tool of cementing preposed flush fluid flush efficiency " (《Drilling fluid and completion
Liquid》The 47-48 page of the 6th phase of volume 26 in 2009) using sandstone simulating the flushing process of the borehole wall, simulation wellbore hole, evaluate and rinse
The flush efficiency of liquid；Article " developments of DCX well cementation simulation flush efficiency evaluating apparatus " (《Oil drilling technology》2013 the 41st
Roll up the 127-129 page of the 3rd phase) develop a kind of DXC well cementation simulation flush efficiency evaluating apparatus；Chinese utility model patent " one
Plant cementing fluid flush efficiency evaluating apparatus " (Authorization Notice No.：CN203515574U a kind of small-sized simulation wellbore hole device) has been invented
Carry out Simulation evaluation flush efficiency.But current simulation wellbore hole evaluating apparatus and flush efficiency evaluation methodology all exist it is following not
Foot：Device design is complicated, and operation is relatively cumbersome, and function is relatively simple；Due to adopting artificial core, make workload larger,
Repeatability is limited to, meanwhile, the design of the device is also unfavorable for the filter cake to form uniform compaction；Device can not mould completely
Intend real filter cake to be formed and rinse displacement process, evaluation methodology does not have broad applicability.
The content of the invention
It is an object of the present invention to improve problems of the prior art, there is provided a kind of well cementation flush efficiency evaluation dress
Put, the device has simple to operate, and comparative is strong, the characteristics of applied widely.
Another object of the present invention is to, there is provided method flushing liquor of cementing the well evaluated using said apparatus, principle
It is reliable, it is simple to operate.Preferable flushing liquor system is evaluated according to flush efficiency, flushing liquor can be designed according to the measure of washing time
Consumption, has a extensive future.
To solve above technical problem, technical scheme below provided by the present invention.
The present invention according to actual pit shaft and simulation wellbore hole Reynolds number principle, with filter paper and stainless steel mesh or quartz sand
Simulated formation, forms filter cake, returns speed in combination with well cementation casing programme and annular space, and the evaluation to flushing liquor of cementing the well is relatively reliable.
A kind of well cementation flush efficiency evaluating apparatus, including simulation wellbore hole, kinetic pump, electromagnetic flowmeter and heating water tank, institute
The inlet for stating simulation wellbore hole is connected with simulation wellbore hole liquid feed valve by articulation, and the liquid outlet of the simulation wellbore hole passes through loose joint
Head is connected with simulation wellbore hole liquid valve；The import of the heating water tank is provided with heating water tank liquid feed valve, and the heating water tank goes out
Mouth is provided with heating water tank liquid valve, and the water tank bottom is provided with water tank exhaust-valve；The heating water tank liquid valve passes through pipeline
Be sequentially connected in series with the kinetic pump, the electromagnetic flowmeter and the simulation wellbore hole liquid feed valve, the simulation wellbore hole liquid valve with
The water tank liquid feed valve is connected.
The simulation wellbore hole includes simulation wellbore hole outer wall, inner core and outer tube, and the outer tube passes top lid end central authorities, as
Liquid outlet, the liquid outlet are connected with liquid valve by bearing, and outer tube is provided with drive plate and is connected with motor, revolve outer tube
Turn；The inner core is threadably secured on interior tube stent, its inner hollow, is communicated with the external world by discharge outlet, the inside
It is hollow to fill quartz sand；Pressurization mouth is provided with above the simulation wellbore hole outer wall, the pressurization mouth is provided with pressurizing valve, the mould
Intend being provided with drain below pit shaft outer wall, the drain is provided with atmospheric valve.Remaining position in addition to the through hole that drilling fluid is flowed through
Seal against each other, can be discharged from discharge outlet by the water that filter paper oozes out.
The simulation wellbore hole inner core includes cylinder, screen cloth and inside drum cover.The cylinder wall has made series of parallel inner core
The trapezoidal seam of axis, stitches a length of 5-30mm, stitches a width of 0.5～2.5mm, and the gross area of seam accounts for inner core cylinder body outer wall gross area 30-
60%, two hypotenuse angles of trapezoidal seam are designed as 8-12 °, and the big base of trapezoidal seam is located at cylinder body outer wall, the little base of trapezoidal seam
Positioned at cylinder inboard wall, it is to avoid quartz sand is spilt in cylinder, while not affecting the formation of filter cake, the screen cloth is a series of different mesh
Number stainless steel mesh, scope are placed on outside the inner core between 40～400 mesh, are close to inner core cylinder, solid by the inside drum cover
Fixed, the inside drum cover is threadedly secured on the inner core cylinder.
This device can simulated formation in the following manner：One kind is in one metafiltration paper of inner core screen cloth outer covering, by filter paper
Carry out simulated formation with different eye mesh screens, filter cake is formed in its surface；It is another kind of varigrained in the filling of inner core hollow space
Quartz sand, simulates the stratum of different permeabilities by screen cloth and varigrained quartz sand.
From filter paper and stainless steel mesh simulated formation, can effective control experiment variable, improve the repeatability of experiment
And comparative；Design hollow in inner core in simulation wellbore hole, preferably can control to be formed magnitude of pressure differential during filter cake, make to be formed
Filter cake compacting it is uniform.
The present invention is by forming a metafiltration cake, simulation well cementation second contact surface flush efficiency, using outer cylinder mould in inner cylindrical surface
Intend the first interface flush efficiency of well cementation.Outer tube can rotate, and can be designed with different guide vanes in outer tube inner wall, simulate
Sleeve rotating or using under the conditions of spiral centering device, the impact of produced different flow patterns to well cementation flushing liquor flush efficiency.
Experiment is rinsed using the device, flushing liquor carries out the row of returning from the bottom up, is consistent with well cementation displacement process.
Between simulation wellbore hole and actual pit shaft discharge speed, relation is determined according to Reynolds number principle：
In formula：vn、vmThe rate of flow of fluid of respectively actual pit shaft and simulation wellbore hole, unit is m/s；Dn、dnIt is respectively actual
Borehole diameter, casing diameter, unit are m；Dm、dmRespectively simulation wellbore hole outer barrel diameter, inner diameter of steel flue；(D-d) it is straight for equivalent
Footpath, unit are m；νn、νmFor prototype and the kinematic viscosity of model, m2/s。
According to experimental principle, with same well cementation flushing liquor used in simulation wellbore hole experiment under real well, so νn=νm,
During simulation wellbore hole can be obtained, flow velocity is as follows with flow velocity relation under real well：
vn(Dn-dn)=vm(Dm-dm) (1)。
Flush efficiency η is calculated as follows：
η=(G1-G2)/(G1-G0) × 100% (2).
In formula：G0For inner core weight or outer tube weight, g；
G1Be formed filter cake after inner core together with filter cake weight or adhesion drilling fluid outer tube weight, g；
G2To form weight of outer tube of the inner core of filter cake together with filter cake or adhesion drilling fluid after a period of time is rinsed, g.
According to Reynolds number same principle, and flushing liquor flush efficiency is evaluated using this device, successively including following
Step：
The first step, averagely returns speed according to casing programme and annular space, with reference to simulation wellbore hole size, calculates Reynolds number by following formula
When identical, simulation wellbore hole returns speed：
vn(Dn-dn)=vm(Dm-dm)；
Second step, by adding drilling fluid in simulation wellbore hole and pressurizeing, forms on wall on filter cake or outer tube outer tube and glues
After attached drilling fluid, weighing formed the inner core of filter cake or after being stained with drilling fluid outer tube quality G1, g；
3rd step, the simulation wellbore hole calculated using flushing liquor are returned speed to be rinsed, after certain hour, weigh inner core or
Quality G of outer tube2, g；
4th step, weighs clean inner core or outer tube quality G0, g；
5th step, calculates flush efficiency η of flushing liquor by following formula：
η=(G1-G2)/(G1-G0) × 100%.
Relative to prior art, the present invention achieves following beneficial effect：
(1) present invention returns row's mode according to down-hole casing programme and flushing liquor and is designed, and experimental result referential is strong, if
Meter is succinct, it is easy to accomplish；
(2) present invention utilizes Reynolds number same principle, is not related to reheology model of fluid etc., calculates simple, and principle understands,
It is applied widely；
(3) present invention utilizes filter paper and different meshes stainless steel mesh or quartz sand to simulate the ground of different permeabilities
Layer, overcomes the deficiency of, high cost, operability difference big using workload during artificial core, with reproducible, comparative it is strong,
Advantage simple to operate；
(4) in the present invention, outer tube design can rotate, for simulating impact of the down-hole casing rotation to flush efficiency of cementing the well,
Meanwhile, outer tube inner wall can be designed with different guide vanes, to rinsing when being provided with spiral centering device for simulation wellbore hole middle sleeve
The impact of efficiency.
Description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description, accompanying drawing only provide with reference to
Illustrate to use, be not used to limit the present invention.
Fig. 1 is the pipeline schematic diagram of present invention well cementation flush efficiency evaluating apparatus.
Fig. 2 is the structural representation of simulation wellbore hole in present invention well cementation flush efficiency evaluating apparatus.
Fig. 3 is simulation wellbore hole inner core longitudinal sectional drawing (left side) and seam eye section in present invention well cementation flush efficiency evaluating apparatus
Figure (right side).
Fig. 4 designs longitudinal sectional drawing for a kind of guide vane of present invention well cementation flush efficiency evaluating apparatus inner core.
Fig. 5 designs longitudinal sectional drawing for a kind of guide vane of present invention well cementation flush efficiency evaluating apparatus inner core.
In figure：1. simulation wellbore hole；1a. simulation wellbore hole outer walls；1b. inner cores；1c. outer tube；End cap above 1d.；1e. simulates well
Cylinder liquid outlet；1f. liquid valves；1g. drive plates；Tube stent in 1h.；1i. inner core cylinders；1j. inside drum covers；1k. stainless steel meshs；
1l. quartz sands；1m. inlets；1n. liquid feed valves；1a1. leakage fluid dram；1a2. pressurization mouths；1a3. drain；1b1. stitches eye；1c1、
1c2. guide vane；2. electromagnetic flowmeter；3. kinetic pump；4. heating water tank；4a. heating water tank liquid feed valves；4b. heating water tank goes out
Liquid valve；4c. resistive heaters.
Specific embodiment
As shown in figure 1, present invention well cementation flush efficiency evaluating apparatus, including simulation wellbore hole 1, electromagnetic flowmeter 2, kinetic pump
3 and heating water tank 4, the inlet 1m of simulation wellbore hole be connected with analog casing liquid feed valve 1n by articulation, and simulation wellbore hole goes out
Liquid mouth 1e is connected with simulation wellbore hole liquid valve 1f by articulation；The import of heating water tank is provided with heating water tank inlet valve 4a,
Heating water tank outlet is provided with heating water tank outlet valve 4b, and water tank bottom is provided with water tank exhaust-valve；Heating water tank liquid valve passes through
Pipeline is sequentially connected in series with the kinetic pump 3, electromagnetic flowmeter 2 and simulation wellbore hole liquid feed valve 1n, simulation wellbore hole liquid valve 1f and institute
State water tank liquid feed valve 4a to be connected.
As shown in Fig. 2 simulation wellbore hole includes simulation wellbore hole outer wall 1a, inner core 1b and trocar sheath 1c, outer tube 1c passes top
Used as liquid outlet 1e, liquid outlet is connected with liquid valve 1f by bearing, and outer tube is provided with drive plate 1g to be come and electricity in lid end 1d central authorities
Machine is connected, and rotates outer tube；Inner core 1b is threadably secured on interior tube stent 1h, its inner hollow, by discharge outlet 1a1 with
The external world communicates, and quartz sand 1l can be filled inside inner core；Pressurization mouth 1a2 is provided with above simulation wellbore hole outer wall, pressurization mouth is provided with and adds
Pressure valve, is provided with drain 1a3 below simulation wellbore hole outer wall, drain is provided with atmospheric valve.In addition to the through hole that drilling fluid is flowed through its
Remaining part position seals against each other, and can be discharged from discharge outlet by the water that filter paper oozes out.
Simulation wellbore hole inner core includes cylinder 1i, stainless steel mesh 1k and inside drum cover 1j.Cylinder 1i has been made in series of parallel
The seam eye 1b1 of cylinder axis, a length of 50～100mm of seam eye, the seam eye gross area account for the 50% or so of internal barrel body total exterior surface area, seam
Eye section is trapezoidal, and two hypotenuse angles are designed as 12 ° or so, and trapezoidal big base should be cylinder inner surface, little base correspondence
Cylinder inner surface, it is to avoid quartz sand 1l is spilt in cylinder, while not affecting to form filter cake, stainless steel mesh can choose 40～400
Different meshes between mesh, are placed on outside inner core, are fixed by inside drum cover 1j, and inside drum cover is threadedly secured to the inner core cylinder
On.
Flush efficiency or preferred flushing formula of liquid specific embodiment of the test flushing liquor to the stratum borehole wall：
The first step, returns flushing liquor of cementing the well when speed determines experiment according to (1) formula and casing programme and down-hole flushing liquor annular space
Proper flow rates；Second step, fills quartz sand in one metafiltration paper of inner core stainless steel mesh outer covering or in its inner hollow；3rd
Step, opens simulation wellbore hole liquid feed valve, simulation wellbore hole liquid valve, and drilling fluid is filled it up with pit shaft, closes liquid feed valve, liquid valve；The
Four steps, are opened analog casing pressurizing valve, are then connected with nitrogen cylinder, arrange nitrogen pressure to require pressure；Open simulation well
Cylinder tapping valve, forms filter cake；5th step, is then shut off pressurizing valve, opens simulation wellbore hole atmospheric valve, liquid valve, to simulation wellbore hole
After being vented, atmospheric valve, liquid valve are closed, opening simulation wellbore hole removes inner core and filter cake carries out note of weighing for the first time thereon
Record；6th step, simulation wellbore hole and heating water tank, pump, effusion meter etc. are sequentially connected in series, and closed heating water tank liquid feed valve, are gone out
Liquid valve；7th step, injects flushing liquor in heating water tank, opens heating water tank liquid feed valve, liquid valve, simulation wellbore hole liquid feed valve,
Liquid valve, starts kinetic pump, the filter cake for being formed is rinsed using flushing liquor, makes to reach using effusion meter coutroi velocity and wants
Ask；8th step, takes out inner core and filter cake is weighed for the second time and recorded；9th step, calculates flush efficiency according to (2) formula；The
Filter paper is reinstalled simulation wellbore hole after record of weighing for the second time by ten steps again, is carried out third time flushing and is weighed；So circulate and record,
According to the change calculations flush efficiency of mud cake weight, finally give flushing of the flushing liquor used to simulated formation borehole wall filter cake and imitate
Rate.
With same method, the flush efficiency of other flushing liquors, including the flush efficiency of oil base drilling fluid filter cake can be measured
Deng.The flushing liquor efficiency surveyed is contrasted, the optimum flushing liquor system of preferable effect.
Determine flushing liquor consumption specific embodiment：
The first step, returns flushing liquor of cementing the well when speed determines experiment according to (1) formula and casing programme and down-hole flushing liquor annular space
Proper flow rates；Second step, fills quartz sand in one metafiltration paper of inner core stainless steel mesh outer covering or in its inner hollow；3rd
Step, opens simulation wellbore hole liquid feed valve, simulation wellbore hole liquid valve, and drilling fluid is filled it up with pit shaft, closes liquid feed valve, liquid valve；The
Four steps, are opened analog casing pressurizing valve, are then connected with nitrogen cylinder, arrange nitrogen pressure to require pressure；Open simulation well
Cylinder tapping valve, forms filter cake；5th step, is then shut off pressurizing valve, opens simulation wellbore hole atmospheric valve, liquid valve, to simulation wellbore hole
After being vented, atmospheric valve, liquid valve are closed, opening simulation wellbore hole removes inner core and filter cake carries out note of weighing for the first time thereon
Record；6th step, simulation wellbore hole and heating water tank, pump, effusion meter etc. are sequentially connected in series, and closed heating water tank liquid feed valve, are gone out
Liquid valve；7th step, injects flushing liquor in heating water tank, opens heating water tank liquid feed valve, liquid valve, simulation wellbore hole liquid feed valve,
Liquid valve, starts kinetic pump, the filter cake for being formed is rinsed using flushing liquor, makes to reach using effusion meter coutroi velocity and wants
Ask；8th step, during flushing, takes out inner sleeve observation flushing situation at set intervals, when efficiency to be rinsed is up to more than 95%, recognizes
To rinse well substantially, washing time is recorded；9th step, according to washing time and casing programme, calculates flushing liquor consumption.
Certainly, the above is only one embodiment of the present invention, it should be pointed out that the common skill of the art
For art personnel, under the premise without departing from the principles of the invention, some improvements and modifications, these improvements and modifications can also be made
Belong within the protection domain of the claims in the present invention.
Claims (1)
1. a kind of well cementation flush efficiency evaluating apparatus, including simulation wellbore hole, electromagnetic flowmeter, kinetic pump and heating water tank, which is special
Levy is that the inlet of the simulation wellbore hole is connected with simulation wellbore hole liquid feed valve, the liquid outlet of the simulation wellbore hole by articulation
Simulation wellbore hole liquid valve is connected with by articulation；The import of the heating water tank is provided with heating water tank liquid feed valve, described to add
Boiler outlet is provided with heating water tank liquid valve, and the water tank bottom is provided with water tank exhaust-valve；The heating water tank liquid valve
It is sequentially connected in series with the kinetic pump, the electromagnetic flowmeter and the simulation wellbore hole liquid feed valve by pipeline, the simulation wellbore hole
Liquid valve is connected with the water tank liquid feed valve；
The simulation wellbore hole includes simulation wellbore hole outer wall, inner core and outer tube, and the outer tube passes top lid end central authorities, used as going out liquid
Mouthful, the liquid outlet is connected with liquid valve by bearing, and outer tube is provided with drive plate and is connected with motor, rotates outer tube；Institute
State inner core to be threadably secured on interior tube stent, its inner hollow is communicated with the external world by discharge outlet, and the inner hollow can
Filling quartz sand；Pressurization mouth is provided with above the simulation wellbore hole outer wall, the pressurization mouth is provided with pressurizing valve, the simulation wellbore hole
Drain is provided with below outer wall, the drain is provided with atmospheric valve；The simulation wellbore hole inner core includes cylinder, screen cloth and inner core
Lid；The cylinder wall makes the trapezoidal seam of series of parallel inner core axis, stitches a length of 5-30mm, stitches a width of 0.5～2.5mm,
The gross area of seam accounts for inner core cylinder body outer wall gross area 30-60%, and two hypotenuse angles of trapezoidal seam are designed as 8-12 °, and trapezoidal seam is big
Base be located at cylinder body outer wall, the little base of trapezoidal seam be located at cylinder inboard wall, it is to avoid quartz sand spills cylinder, at the same do not affect filter
The formation of cake, the screen cloth are a series of different meshes stainless steel meshs, and scope is placed on the inner core between 40～400 mesh
Outside, is close to inner core cylinder, is fixed by the inside drum cover, and the inside drum cover is threadedly secured on the inner core cylinder；Dress
Put by the outer tube analog casing, outer tube can rotate, and outer tube inner wall is designed with guide vane；Simulate ground in the following ways
Layer：In the overcoating metafiltration paper of inner core screen cloth, by filter paper and screen cloth come simulated formation, in its surface formation filter cake, or including
Cylinder hollow space fills varigrained quartz sand, and the ground of different permeabilities is simulated by screen cloth and different grain size quartz sand
Layer.
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| CN104863533B true CN104863533B (en) | 2017-04-19 |
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Cited By (1)
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| CN110107235A (en) * | 2019-06-14 | 2019-08-09 | 西南石油大学 | A kind of compacting of drilling fluid filter cake and cleaning efficiency integration evaluating apparatus and method |
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| CN106555581B (en) * | 2015-09-23 | 2020-05-15 | 中国石油化工股份有限公司 | Manufacturing device and manufacturing method of shaft |
| CN106285526B (en) * | 2016-09-23 | 2019-04-09 | 中国石油天然气集团公司 | Simulate experimental provision and experimental method that Cementing rinses mud cake |
| CN108240185B (en) * | 2016-12-27 | 2020-05-08 | 中国石油天然气股份有限公司 | Evaluation device and method for well cementation flushing efficiency |
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| CN113882852B (en) * | 2020-06-18 | 2024-05-28 | 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 |
| CN116087434B (en) * | 2023-03-13 | 2024-03-29 | 中国石油天然气集团有限公司 | Testing device and testing method |
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| CN104863533A (en) | 2015-08-26 |
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