CN108590570A - Evaluating cementing concrete starches the experimental rig and test method of replacement efficiency - Google Patents
Evaluating cementing concrete starches the experimental rig and test method of replacement efficiency Download PDFInfo
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- CN108590570A CN108590570A CN201810208217.XA CN201810208217A CN108590570A CN 108590570 A CN108590570 A CN 108590570A CN 201810208217 A CN201810208217 A CN 201810208217A CN 108590570 A CN108590570 A CN 108590570A
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- slurry
- replacement
- cycle
- pit shaft
- drilling fluid
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Classifications
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- 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
- E21B47/00—Survey of boreholes or wells
Abstract
The present invention proposes that a kind of experimental rig and test method of evaluating cementing concrete slurry replacement efficiency, the experimental rig include the platform system being arranged on experiment porch, cycle replacement system with slurry and the wellbore system being arranged on platform system；The test method passes through a set of clear water cycle replacement system with slurry, a set of cement mortar cycle replacement system with slurry and a set of drilling fluid cycle replacement system with slurry, it returns outlet spout with the fluid of wellbore system in turn by independent quick coupling respectively and fluid injection conduit mouth is connected cycle, with this to measure and by obtaining cementing slurry replacement efficiency after calculating.The present invention proposes a kind of experimental rig and test method of Lab-evaluation cementing slurry replacement efficiency, can more accurately measure and calculate cementing slurry replacement efficiency, solves the problems, such as that the evaluation of cementing slurry replacement efficiency is difficult.
Description
Technical field
The present invention relates to petroleum engineering cementing technology field, more particularly to a kind of Lab-evaluation cementing slurry replaces
The experimental rig and test method of efficiency.
Background technology
Cementing slurry replacement efficiency refers to replacement section grout volume in Process of Cementing after cement mortar replacement drilling fluid
The shared percentage for replacing section annular volume.The percentage is bigger, shows that cementing slurry replacement efficiency is better；The percentage is got over
It is small, show that cementing slurry replacement efficiency is poorer.Cementing slurry replacement efficiency is an important factor for influencing cementing quality, in reality
After the well cementing process of border, replacement efficiency is difficult to be evaluated, therefore for optimization design drilling liquid water mud property and cementing
Construction parameter need to evaluate cemented replacement efficiency before actual job of cementing the well.Currently, being typically all to carry out mould with some softwares
Quasi- cementing displacement process, and then cementing replacement efficiency is evaluated, exist in simulation process many false
If the case where not conforming to the actual conditions, there is also certain errors for obtained replacement efficiency.
Invention content
In order to solve the above-mentioned technical problem, the present invention proposes a kind of experiment dress of Lab-evaluation cementing slurry replacement efficiency
It sets and test method, can more accurately measure and calculate cementing slurry replacement efficiency, solve cementing slurry replacement
The problem of efficiency rating difficulty.
For this purpose, the specific technical solution that the present invention uses is：
A kind of experimental rig of evaluating cementing concrete slurry replacement efficiency, is arranged on experiment porch, which includes rack
System, cycle replacement system with slurry and wellbore system three parts, the platform system include electronic scale and are arranged in electronics
Supporting rack on scale, the wellbore system include the pit shaft being fixed on supporting rack and the casing that is arranged inside pit shaft, institute
The inner bottom surface clearance fit of the bottom end and pit shaft of stating casing forms channel, and the upper end setting fluid of the pit shaft returns outlet spout,
And the casing for stretching out pit shaft and pit shaft closing are connected by the cooperation with wellbore packer, the upper end setting stream of described sleeve pipe
Body injects nozzle, and it includes one formed after being connected by mud pit, hose, quick coupling and pump that the cycle with slurry, which replaces system,
It covers clear water cycle replacement system with slurry, a set of cement mortar cycle replacement system with slurry and a set of drilling fluid cycle with slurry and replaces system
System, three sets of cycle replacement systems with slurry return outlet spout and fluid note by independent quick coupling with the fluid of wellbore system in turn
Enter nozzle to be connected.
Mud pit in said program includes clear water reserviors, cement stock tank and drilling fluid pot, and the pit shaft and casing are adopted
It is made of lightweight pvc pipe, the uneven pit shaft with certain roughness is formed in the inner wall surface spray furnace of pit shaft, to protect
Card is close with the environment of practical pit shaft.
Above-mentioned evaluating cementing concrete slurry replacement efficiency experimental rig further includes that two fast quick access are arranged in the bottom surface of pit shaft
Head, one of quick coupling communicate after being connect with release valve, hose with drilling fluid pot, another quick coupling and release valve,
Lead to one with graduated container after hose connection.
Based on a kind of above-mentioned test method of evaluating cementing concrete slurry replacement efficiency experimental rig, the test method is by following
Step carries out：
S1, builds the experimental rig of evaluating cementing concrete slurry replacement efficiency, and pit shaft and casing are used lightweight pvc pipe system
Make, when making pit shaft, first by pvc pipe inner wall polishing overhauling, then use ejecting gun spray furnace on inside pipe wall so that
Shaft in wall is uneven and has certain roughness, closer to the environment of practical pit shaft；
S2 replaces systematic survey using clear water cycle with slurry and goes out total volume V of the pit shaft including casing1, then calculate
The volume V of casing2, and then obtain the annular volume V=V in pit shaft1-V2；
S3 configures cement mortar, is recycled in wellbore system cement mortar using cement mortar cycle replacement system with slurry, later
Emptying cement mortar measures the weight G of wellbore system at this time1, then wellbore system cleaned up and dried；
S4 configures drilling fluid, and the density for measuring the drilling fluid is ρm, using drilling fluid cycle replacement system with slurry by drilling well
Liquid recycles in wellbore system, is vented drilling fluid later；
Cement mortar in S3 is recycled replacement, later by S5 by cement mortar cycle replacement system with slurry in wellbore system
Emptying cement mortar measures the weight G of wellbore system at this time2；
S6 finally calculates cementing slurry replacement efficiency：
η in formula indicates cementing slurry replacement efficiency, ρmIndicate the density of drilling fluid, G2-G1For the remaining drilling well of annular space
Liquid weight, V1-V2Indicate annular space total volume, then the percentage that 1- residuals drilling fluid volume accounts for annular volume is the top of cement mortar
For efficiency.
Further, in above-mentioned test method the measurement method of total volume V1 of the step S2 pit shafts including casing be by
Clear water recycles in wellbore system to be vented in a container with a scale, is obtained by reading the scale value of the container, casing
Volume V2 then obtained by following equation：
D in formulacFor the outer diameter of casing, HcFor the height of casing, DcAnd HcIt can be obtained by measuring.
Further, the wellbore system weight G in above-mentioned test method in step S3 and S51And G2It is by electronic scale point
It Ce Liang not obtain.
Further, the clear water cycle replacement system with slurry described in above-mentioned test method, cement mortar cycle with slurry replace
The cycle discharge capacity of system and drilling fluid cycle replacement system with slurry is 10L/min.
Compared with prior art, the beneficial effects of the present invention are：A kind of cementing slurry provided by the invention replaces effect
Rate experimental rig and test method, spray furnace forms the uneven well with certain roughness on the inner wall of its pit shaft
Wall so that the internal environment of pit shaft is more nearly the borehole environment actually cemented the well；Meanwhile test method of the invention passes through three sets
Outlet spout is returned with the fluid of wellbore system in turn for cycle replacement system with slurry and fluid injection conduit mouth is connect, to evaluate practical well cementation
The displacement process of cement mortar accounts for the percentage of annular volume to show that the replacement of cement mortar is imitated by calculating residual drilling fluid volume
Rate has the advantage closer to practical well cementing process, the cementing slurry replacement efficiency obtained more reliable；In addition, this hair
Bright experimental rig has small advantage, is suitble to indoors evaluate live cementing slurry replacement efficiency.
Description of the drawings
Fig. 1 is the overall structure diagram that a kind of evaluating cementing concrete of the present invention starches replacement efficiency experimental rig.
As shown in the figure：
1-7 is quick coupling, and 8-10 is pump, and 11 be clear water reserviors, and 12 be cement stock tank, and 13 be drilling fluid pot, and 14 be electronics
Scale, 15 be container with a scale, and 16 be supporting rack, and 17 be casing, and 18 be pit shaft, and 19 be fluid injection conduit mouth, and 20 return for fluid
Outlet spout, 21 be wellbore packer, and 22 be hose, and 23-24 is release valve.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with the accompanying drawings and specific implementation
The present invention is described in more detail for example.It is understood that described herein, specific examples are only used to explain the present invention,
It is not intended to limit the present invention.
As shown in Figure 1, a kind of evaluating cementing concrete starches replacement efficiency experimental rig, which is divided by its function as rack system
System, cycle replacement system with slurry and wellbore system three parts, specifically comprise：
Platform system includes electronic scale 14 and supporting rack 16, and supporting rack 16 is fixed on electronic scale 14；
Cycle replacement system with slurry includes a set of clear water cycle replacement system with slurry, a set of cement mortar cycle replacement with slurry system
System and a set of drilling fluid cycle replacement system with slurry, clear water cycle replacement system with slurry be by clear water reserviors 11, hose 22, pump 8 and
Quick coupling 7 forms, and cement mortar cycle replacement system with slurry is by 1,2 group of cement stock tank 12, hose 22, pump 9 and quick coupling
At recyclable pipeline, drilling fluid cycle replacement system with slurry is by drilling fluid pot 13, hose 22, pump 10 and quick coupling 3,4
The recyclable pipeline of composition；
Wellbore system includes the pit shaft 18 being fixed on supporting rack 16 and the casing 17 being arranged inside pit shaft 18, casing 17
The inner bottom surface clearance fit of bottom end and pit shaft 18 form circular passage, i.e. annular space, in the upper end of pit shaft 18, setting fluid returns
Outlet spout 20, fluid returns outlet spout 20 and connects casing 17 and the closing of pit shaft 18 with the cooperation of wellbore packer 21, in casing 17
Fluid injection conduit mouth 19 is arranged in upper end, is arranged quick coupling 5 and 6 in the bottom surface of pit shaft 18, and quick coupling 5 and hose 22 are put
Stream valve 23 is passed through a container 15 with a scale after connecting, and quick coupling 6 is passed through drilling fluid pot after being connect with hose 22, release valve 24
13。
The evaluating cementing concrete that the present embodiment is described in detail with reference to Fig. 1 starches the experiment side of replacement efficiency experimental rig
Method is as follows：
S1 builds an evaluating cementing concrete slurry replacement efficiency experimental rig as shown in Figure 1, and pit shaft and casing are using light
Matter pvc pipe makes, and when making pit shaft, first by pvc pipe inner wall polishing overhauling, then uses ejecting gun spray furnace in pipe
On wall so that shaft in wall is uneven and has certain roughness, closer to the environment of practical pit shaft；
S2 replaces systematic survey using clear water cycle with slurry and goes out total volume V of the pit shaft including casing1, specially：It closes
Release valve 23 and 24 is closed, quick coupling 7 is connect and is connected with fluid injection conduit mouth 19, starts pump 8, with the discharge capacity of 10L/min toward well
Cylinder 18 in injected clear water, until fluid return outlet spout 20 begin with fluid it is excessive when stop pump 8, wait for fluid level stabilization be followed by
Quick coupling 5 is opened release valve 23, fluid is put into container 15 with a scale, is read after the fluid emptying in pit shaft 18
The scale value of container 15 is V1, quick coupling 5 is laid down after record, is closed release valve 23, is cleared up container 15 with a scale；
Calculate the volume V of casing 172, the outer diameter D c and height Hc of casing 17 are obtained by measurement, then the volume of casing 17
For：
And then obtain the annular volume V=V in pit shaft 181-V2；
S3 configures cement mortar, is recycled in wellbore system cement mortar using cement mortar cycle replacement system with slurry, later
Emptying cement mortar measures the weight G of wellbore system at this time1, specially：Quick coupling 7 is laid down, quick coupling 1 is connected on fluid
Nozzle 19 is injected, quick coupling 2 is connected on fluid and returns outlet spout 20；Mortar architecture is configured, starts pump 9, with the row of 10L/min
Amount cycle one circulating cycle of cement mortar, quick coupling 1 and 2 is dismantled, quick coupling 5 is connected, and opens release valve 23, allowed and simulate well
Cement mortar in cylinder 18 flows into container 15 with a scale, when 22 dripless of hose that quick coupling 5 is connected, dismantles fast quick access
First 5, release valve 23 is closed, is then weighed to casing 17 and pit shaft 18, weight is denoted as G1, clear up container 15 with a scale
With cannula cleaning 17 and pit shaft 18 and dried；
S4 configures drilling fluid, and the density for measuring the drilling fluid is ρm, using drilling fluid cycle replacement system with slurry by drilling well
Liquid recycles in wellbore system, is vented drilling fluid later, specially：Quick coupling 3 is connected on fluid injection conduit mouth 19, it will be quick
Connector 4 is connected on fluid and returns outlet spout 20；Drilling fluid system is configured, its density p is measuredm, start pump 10, with the discharge capacity of 10L/min
5 circulating cycles of circulating fluid, quick coupling 3 and 4 is dismantled, quick coupling 6 is connected, and opens release valve 24, allows simulation wellbore hole
Drilling fluid in 18 flows into drilling fluid pot 13 and dismantles quick coupling 6 when 22 dripless of hose that quick coupling 6 is connected, and closes
Close release valve 24；
Cement mortar in S3 is recycled replacement, later by S5 by cement mortar cycle replacement system with slurry in wellbore system
Emptying cement mortar measures the weight G of wellbore system at this time2, specially：Quick coupling 1 is connected on fluid injection conduit mouth 19, it will
Quick coupling 2 is connected on fluid and returns outlet spout 20；Start pump 9, raw water one circulating cycle of mud is recycled with the discharge capacity of 10L/min, is unloaded
Quick coupling 1 and 2 is changed up, quick coupling 5 is connected, and opens release valve 23, makes the cement mortar inflow in simulation wellbore hole 18 with a scale
Container 15 dismantle quick coupling 5 when 22 dripless of hose that quick coupling 5 is connected, close release valve 23, it is then right
Casing 17 and pit shaft 18 are weighed, and weight is denoted as G2, clear up container 15 with a scale；
S6 finally calculates cementing slurry replacement efficiency：
η in formula indicates cementing slurry replacement efficiency, ρmIndicate the density of drilling fluid, G2-G1To remain the weight of drilling fluid
Amount, V1-V2Indicate annular space total volume, then the percentage that 1- residuals drilling fluid volume accounts for annular space total volume is the replacement of cement mortar
Efficiency.
The process that operation acquires the evaluating cementing concrete slurry replacement efficiency of the present embodiment is carried out according to above-mentioned test method
For：
S1 builds an evaluating cementing concrete slurry replacement efficiency experimental rig as shown in Figure 1；
S2 closes release valve 23 and 24, quick coupling 7 is connect and is connected with fluid injection conduit mouth 19, starts pump 8, with 10L/
The discharge capacity of min injected clear water into pit shaft 18, until fluid return outlet spout 20 begin with fluid it is excessive when stop pump 8, wait for fluid
Liquid level stabilizing is followed by quick coupling 5, opens release valve 23, fluid is put into container 15 with a scale, is waited in pit shaft 18
The scale value V of container 15 is read after fluid emptying1=0.05699m3, quick coupling 5 is laid down after record, closes release valve 23, clearly
Manage container 15 with a scale；
Calculate the volume of casing 17：
S3 lays down quick coupling 7, and quick coupling 1 is connected on fluid injection conduit mouth 19, and quick coupling 2, which is connected on fluid, to be returned
Outlet spout 20；Mortar architecture is configured, pump 9 is started, one circulating cycle of cement mortar is recycled with the discharge capacity of 10L/min, is dismantled quickly
Connector 1 and 2 connects quick coupling 5, and opens release valve 23, and the cement mortar in simulation wellbore hole 18 is allowed to flow into container with a scale
15, when 22 dripless of hose that quick coupling 5 is connected, quick coupling 5 is dismantled, release valve 23 is closed, then to casing 17
It weighs with pit shaft 18, weight G1=11.16kg clears up container 15 with a scale and cannula cleaning 17 and pit shaft 18 and incites somebody to action
It is dried；
Quick coupling 3 is connected on fluid injection conduit mouth 19 by S4, and quick coupling 4, which is connected on fluid, returns outlet spout 20；Configuration is bored
Well liquid system measures its density pmFor 1250kg/m3, start pump 10, with 5 circulating cycles of discharge capacity circulating fluid of 10L/min,
Quick coupling 3 and 4 is dismantled, quick coupling 6 is connected, and opens release valve 24, the drilling fluid in simulation wellbore hole 18 is allowed to flow into drilling well
Liquid pool 13 dismantles quick coupling 6 when 22 dripless of hose that quick coupling 6 is connected, and closes release valve 24；
Quick coupling 1 is connected on fluid injection conduit mouth 19 by S5, and quick coupling 2, which is connected on fluid, returns outlet spout 20；Start pump
9, raw water one circulating cycle of mud is recycled with the discharge capacity of 10L/min, quick coupling 1 and 2 is dismantled, connects quick coupling 5, and open
Release valve 23 allows the cement mortar in simulation wellbore hole 18 to flow into container 15 with a scale, waits for 22 nothing of hose that quick coupling 5 is connected
When drop, quick coupling 5 is dismantled, release valve 23 is closed, then weighs to casing 17 and pit shaft 18, weight is denoted as G2=
12.24kg clears up container 15 with a scale；
S6 finally calculates cementing slurry replacement efficiency：
The cementing slurry replacement efficiency obtained by above-mentioned experimental rig and test method, since simulation operating mode is closer
In operating mode of actually cementing the well, accuracy and reliability higher can more accurately react cementing slurry replacement efficiency, be practical
OPTIMIZATION OF DRILLING FLUID cement slurry property and cementing practice parameter provide strong foundation in cementing operation.
It should be understood that the part not illustrated in specification is the prior art or common knowledge.The present embodiment is only used
It in the explanation invention, rather than limits the scope of the invention, the equivalent replacement that those skilled in the art are the present invention
Equal modifications are deemed to fall in invention claims institute protection domain.
Claims (8)
1. a kind of experimental rig of evaluating cementing concrete slurry replacement efficiency, including be arranged on experiment porch platform system, match
Wellbore system slurry cycle replacement system and be arranged on platform system, it is characterised in that：The platform system includes electricity
Sub- scale and the supporting rack being arranged on electronic scale, the wellbore system include the pit shaft being fixed on supporting rack and are arranged in well
Casing inside cylinder, the bottom end of described sleeve pipe and the inner bottom surface clearance fit of pit shaft form channel, and the upper end of the pit shaft is set
It sets fluid and returns outlet spout, and connected the casing for stretching out pit shaft and pit shaft closing by the cooperation with wellbore packer, the set
The upper end of pipe is arranged fluid injection conduit mouth, the cycle with slurry replace system include by mud pit, hose, quick coupling and
A set of clear water cycle replacement system with slurry, a set of cement mortar cycle replacement system with slurry and a set of drilling fluid formed after pump connection
Cycle replacement system with slurry, three sets of cycle replacement systems with slurry are returned with the fluid of wellbore system in turn by independent quick coupling
Outlet spout is connected with fluid injection conduit mouth.
2. a kind of experimental rig of evaluating cementing concrete slurry replacement efficiency according to claim 1, it is characterised in that：It is described
Mud pit include clear water reserviors, cement stock tank and drilling fluid pot, the pit shaft and casing are lightweight pvc pipe, the pit shaft
Inner wall surface it is uneven.
3. a kind of experimental rig of evaluating cementing concrete slurry replacement efficiency according to claim 2, it is characterised in that：It is described
Two quick couplings are arranged in the bottom surface of pit shaft, and one of quick coupling communicates after being connect with release valve, hose with drilling fluid pot,
Another quick coupling is led to after being connect with release valve, hose with graduated container.
4. a kind of experiment side of evaluating cementing concrete slurry replacement efficiency experimental rig according to claim 1-3 any one
Method, it is characterised in that：The test method carries out according to the following steps：
S1 builds the experimental rig of evaluating cementing concrete slurry replacement efficiency；
S2 replaces systematic survey using clear water cycle with slurry and goes out total volume V of the pit shaft including casing1, then calculate casing
Volume V2, and then obtain the annular volume V=V in pit shaft1-V2；
S3 configures cement mortar, recycles in wellbore system cement mortar using cement mortar cycle replacement system with slurry, is vented later
Cement mortar measures the weight G of wellbore system at this time1, then wellbore system cleaned up and dried；
S4 configures drilling fluid, and the density for measuring the drilling fluid is ρm, drilling fluid is existed using drilling fluid cycle replacement system with slurry
It is recycled in wellbore system, is vented drilling fluid later；
Cement mortar in S3 in wellbore system is recycled replacement by cement mortar cycle replacement system with slurry, is vented later by S5
Cement mortar measures the weight G of wellbore system at this time2；
S6 finally calculates cementing slurry replacement efficiency：
η in formula indicates cementing slurry replacement efficiency, ρmIndicate the density of drilling fluid, G2-G1For the remaining drilling fluid weight of annular space
Amount, V1-V2Then indicate annular space total volume.
5. a kind of test method of evaluating cementing concrete slurry replacement efficiency according to claim 4, it is characterised in that：It is described
Pit shaft and casing are made using lightweight pvc pipe in step S1, when making pit shaft first by pvc pipe inner wall polishing overhauling, then
Using ejecting gun spray furnace on inside pipe wall, the uneven simulation wellbore hole with certain roughness is formed.
6. a kind of test method of evaluating cementing concrete slurry replacement efficiency according to claim 4, it is characterised in that：It is described
Clear water is recycled in wellbore system in step S2 and is vented in a container with a scale, by read the scale value of the container come
Obtain total volume V of the pit shaft including casing1, the volume V of casing2It is obtained by following equation：
D in formulacFor the outer diameter of casing, HcFor the height of casing.
7. a kind of test method of evaluating cementing concrete slurry replacement efficiency according to claim 4, it is characterised in that：It is described
Wellbore system weight G in step S3 and S51And G2It is measured and is obtained respectively by electronic scale.
8. a kind of test method of evaluating cementing concrete slurry replacement efficiency according to claim 4, it is characterised in that：It is described
The cycle discharge capacity of clear water cycle replacement system with slurry, cement mortar cycle replacement system with slurry and drilling fluid cycle replacement system with slurry
It is 10L/min.
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| CN201810208217.XA CN108590570B (en) | 2018-03-14 | 2018-03-14 | Test device and test method for evaluating displacement efficiency of well cementation cement slurry |
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| CN201810208217.XA CN108590570B (en) | 2018-03-14 | 2018-03-14 | Test device and test method for evaluating displacement efficiency of well cementation cement slurry |
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| CN110617018A (en) * | 2019-09-16 | 2019-12-27 | 西南石油大学 | Device and method for evaluating flushing efficiency of filter cake of well cementation cement injection drilling fluid |
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