CN107884335B - A kind of determination method of the fracture-type reservoir plugging material closure with failure cause - Google Patents
A kind of determination method of the fracture-type reservoir plugging material closure with failure cause Download PDFInfo
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- CN107884335B CN107884335B CN201710900954.1A CN201710900954A CN107884335B CN 107884335 B CN107884335 B CN 107884335B CN 201710900954 A CN201710900954 A CN 201710900954A CN 107884335 B CN107884335 B CN 107884335B
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- plugging material
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
Abstract
The invention discloses a kind of fracture-type reservoir plugging materials to block the determination method with cause of destabilization.Fracture-type reservoir is divided into two parts with plugging material, portion carries out the test of initial friction coefficient；Another is added into the stirring of drilling fluid high temperature, carry out crack and blocks experiment, it collects and blocks with the plugging material in the preceding crack rock sample of unstability, it determines the change curve of plugging material coefficient of friction at any time, determines that plugging material blocks band cause of destabilization according to static friction phases-time and the coefficient of sliding friction.The present invention considers plugging material high temperature ageing, the circulation abrasion of more true simulated leaking stoppage material in the wellbore；The present invention is based on plugging materials to block band structure and its stability, simulates the pressure-bearing unstability that band is blocked in practical Process of Leaking Stoppage, can accurately determine that plugging material blocks band cause of destabilization, and important foundation is provided with destabilization problems quickly and efficiently to solve to block；This method also fracture reservoir plugging material it is reasonable preferably it is significant.
Description
Technical field
The present invention relates to working solutions during oil and gas industry drilling completion to miss control field, and in particular to splits
Seam property reservoir plugging material blocks band cause of destabilization determination method.
Background technique
Fractured reservoirs are extensive in distribution on global, and stock number is huge, and the crack of development is the main seepage channel of oil gas,
But the presence in crack will lead to the leakage of drilling fluid again.Drilling fluid leakage not only loses a large amount of drilling fluids, extends drilling period, lures
The accidents such as well slough, blowout are sent out, but also will cause serious formation damage, greatly restrict the Efficient Development of oil-gas reservoir.Cause
This, the leakage control of fracture-type reservoir is particularly important.
The common physics plugging material of fracture-type reservoir mainly includes rigid material, elastic material and fiber three categories, is led to
It crosses plugging material and blocks leakage channel, be the effective ways for controlling drilling fluid leakage and protecting fracture-type reservoir.In drilling fluid
After three classes plugging material is added, rigid particles are built bridge in crack stenosis, and entire plugged zone is made to stop moving to crack depths
It is dynamic, play the role of plugged zone skeleton.Elastic particle extrusion, in fracture surface, enhancing blocks the resilient force of itself
The frictional force of layer and fracture surface further prevents plugged zone from moving in crack.The rack knot of fiber raising plugged zone globality
Structure, while capturing rigid particles and elastic granule.Three classes plugging material forms high-intensitive plugging material by synergistic effect
Block band；The arbitrary portion of three classes plugging material constitutes crack and blocks with indispensable a part.Plugging material blocks band
By the common of reservoir high temperature fluid, pit shaft head of liquid, crack closure stress, fracture surface frictional force etc. after being formed in crack
Effect.According to particulate matter theory of mechanics, complicated riding chain network will form inside plugged zone under these external applied loads, it is
The material base of grain supporting substances external applied load.Since fracture surface waviness and dimpling height have differences, so that along fracture height
Direction plugged zone and fracture surface frictional force are of different sizes.Along fracture height direction plugged zone discontinuity, there are low-frictional forces
Point, recurring structure destroys easily under shear stress effect in these low friction forces, and unstability occurs for plugged zone.When the friction of plugging material
When coefficient is lower, the riding chain network under the shear stress of very little in plugged zone is just easily broken, and blocks band and unstability occurs.Envelope
Blocking up with unstability is the major reason for causing leakage failure, leakage repeated.
But still lack effective analysis method of the closure with unstability both at home and abroad at present, it is difficult to which it is accurate to carry out to its cause of destabilization
Determine.Therefore research fracture-type reservoir plugging material blocks the analysis method with cause of destabilization, utilizes specific characterizing method pair
Plugging material analyzes closure with unstability trend, and accurate determine blocks with cause of destabilization, can be quickly and efficiently to solve
Closure provides important foundation with destabilization problems.Research achievement not only fracture reservoir plugging material it is reasonable preferably have it is important
Meaning, and the safe and efficient drilling of fracture reservoir and reservoir protection have great importance.
Summary of the invention
The present invention be directed to background technique the problem of, propose one kind can quickly, effectively determine fracture-type reservoir
Plugging material blocks the method with cause of destabilization.
Fracture-type reservoir plugging material proposed by the present invention blocks the determination method with cause of destabilization, the specific steps are as follows:
(1) plugging material of fracture-type reservoir drilling well is divided into three kinds of combinations by its mechanical property, geometric properties: single
Rigid material, rigid material and elastic material, rigid material and fiber；
(2) plugging material that every kind of step (1) is combined uniformly mixed according to a certain percentage, be divided into two parts, Yi Fenjin
The test of row initial friction coefficient, by another plugging material, it is added in drilling fluid stirs certain time at a certain temperature；
(3) rock sample for selecting specific fracture width carries out steel rock sample crack using drilling fluid in step (2) and blocks experiment,
In triplicate, taking the average value tested three times is the bearing capacity that crack blocks band for every group of experiment；
(4) drilling fluid in step (3) is repeated to carry out the closure experiment of steel rock sample crack, when displacement pressure is slightly less than step
(3) when the crack determined in blocks band bearing capacity, terminate crack and block experiment；
(5) the steel rock sample in step (4) is taken out, drying, collects the plugging material in steel rock sample crack, before obtaining unstability
The friction coefficient curve of plugging material；
(6) the reason of causing fracture-type reservoir plugging material to block band unstability includes 3 kinds: rigid material failure, elastic material
Material failure and fiber failure；Specific manifestation are as follows:
Compared with plugging material initial friction coefficient curve, the average coefficient of sliding friction of plugging material obviously drops before unstability
The extension fluctuating range of low, coefficient of friction at any time obviously becomes smaller, then blocks band cause of destabilization as rigid material failure；
Compared with plugging material initial friction coefficient curve, static friction rank on the friction coefficient curve of plugging material before unstability
For section when the time is obviously shortened, average coefficient of sliding friction is substantially reduced, then blocking band cause of destabilization is that elastic material fails；
Occur apparent coefficient of friction drop, and the width that coefficient of friction reduces before unstability on the friction coefficient curve of plugging material
Degree with the extension of time gradually become smaller when, then blocking band cause of destabilization is fiber failure；
It is according in actual reservoir temperature and drilling process that the drilling fluid stirs certain time at a certain temperature
Circulation time determines.
The bearing capacity that the crack blocks band refers to that crack is blocked with displacement pressure corresponding when destroying.
Compared with prior art, this method has the advantages that
(1) this method considers plugging material high temperature ageing, more truly the circulation mill of simulated leaking stoppage material in the wellbore
Erosion；
(2) this method is simulated and is blocked in practical Process of Leaking Stoppage based on plugging material closure band structure and its stability
The pressure-bearing unstability of band can accurately determine that plugging material blocks band cause of destabilization with a variety of means of testing；
(3) suitable plugging material can be more targetedly selected according to this method, improves leakage control efficiency；
(4) operating procedure is simple, and economic cost is low.
Detailed description of the invention
Fig. 1 be the single rigid material of the present invention initially with friction coefficient curve before unstability；
Fig. 2 be rigid material of the present invention combined with elastic material initially with friction coefficient curve before unstability；
Fig. 3 is friction coefficient curve before rigid material of the present invention and fiber combinations unstability.
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, in conjunction with attached drawing to this hair
Bright one embodiment is further described.Embodiment is served only for that the present invention is further detailed, and should not be understood as pair
The limitation of the scope of the present invention, those skilled in the art's content according to the present invention make it is some it is nonessential improvement and
Adjustment also belongs to the scope of protection of the invention.
Embodiment 1
To verify reliability of the invention, selecting the common material of situ of drilling well is experiment plugging material, carries out Crack Sealing
Stifled laboratory experiment analyzes plugging material and blocks frictional behavior before band unstability, blocks band cause of destabilization to plugging material and sentences
It is fixed.Specific steps are as follows:
A, the common plugging material of situ of drilling well is divided into rigid material, elastic material and fiber three classes, selected
Plugging material is divided into single rigid material, rigid material is combined with elastic material, rigid material is combined with three kinds of fiber combinations；
B, the plugging material of every kind of combination in step a uniformly mixed according to a certain percentage, be divided into two parts, Yi Fenjin
The test of row initial friction coefficient, by another plugging material, it, which is added in drilling fluid, stirs 48h under the conditions of 150 DEG C；
C, the steel rock sample for selecting certain fracture width carries out crack using drilling fluid in step b and blocks experiment, every group of experiment
In triplicate, taking the average value tested three times is the bearing capacity that crack blocks band；
D, in step c drilling fluid repeat carry out crack block experiment, when displacement pressure be slightly less than in step c determine
When crack blocks band bearing capacity, terminates crack and block experiment；
E, the steel rock sample in step d is taken out, drying, collects the plugging material in steel rock sample crack, blocked up before obtaining unstability
Leak the friction coefficient curve of material；
Experimental result is shown:
Single rigid material initially with friction coefficient curve before unstability as shown in Figure 1, the coefficient of friction of rigid material at any time
Between extension in unexpected great-jump-forward fluctuate, show typical stickiness sliding characteristics.By rigid material initial friction coefficient curve
As can be seen that its average coefficient of sliding friction is 0.78.Compared with initial friction coefficient curve, rigid material is averaged before unstability
The coefficient of sliding friction is reduced to 0.42, and reduced trend is presented in the extension fluctuating range of coefficient of friction at any time.Slip friction
Coefficient and static friction phases-time are the important parameters for describing Frictional Slipping complexity.The contact of friction surface is actually
Contact between micro-bulge.Two contact surfaces are with respect in sliding process, micro-bulge occlusion, the changing of the relative positions of contact.The rigid material of experiment
Material granularity during simulating reservoir temperature condition agitation cycle can occur shearing and degrade, and particle surface also can be more and more smooth,
It is easier to occur to slide relatively between plugging material, plugging material blocks the easier unstability of band.Thus, the closure band of rigid material failure
Show low average coefficient of sliding friction, lesser coefficient of friction fluctuating range.
(Fig. 2), rigid material and elastic material known to initial friction coefficient curve are combined with elastic material by rigid material
Static friction phases-time is longer on friction coefficient curve after combination, average coefficient of sliding friction is larger.Contact between rigid material
Mode belongs to rigid contact, and the contact between elastic material is Elastic Contact.Under conditions of external applied load is certain, plugging material
Flexible deformation is bigger, and micro-bulge engagement is closer, is just more difficult to slide between plugging material.Experiment is thin with elastic material
Grain rubber, easily occurs high temperature ageing under simulant bearing conditions of coal seam, loses its original elasticity, show as on friction coefficient curve
Shorter static friction phases-time and lower average coefficient of sliding friction.
As shown in figure 3, there is apparent coefficient of friction on rigid material and the friction coefficient curve of fiber combinations before unstability
Decline, and coefficient of friction elder generation sharp fall declines by a small margin again.Since experiment involved fiber material draw ratio is big, the winding of fiber
It will increase and block the resistance with sliding, but since the whole tensile strength of fiber is smaller, particle is wrapped in during Frictional Slipping
Fracture failure easily occurs for the fiber on material.It shows as coefficient of friction on friction coefficient curve and is greatly lowered, with fibre
The fracture of dimension shortens, and winding effect dies down, and the amplitude that coefficient of friction reduces gradually becomes smaller.
To sum up, suitable plugging material can be more targetedly selected according to this method, improves leakage control efficiency.
Claims (3)
1. a kind of fracture-type reservoir plugging material blocks band cause of destabilization determination method, by the leak stopping material of fracture-type reservoir drilling well
Material is divided into three kinds of combinations: single rigid material, rigid material and elastic material, rigid material by its mechanical property, geometric properties
With fiber, it is characterised in that include the following steps:
(1) plugging material of fracture-type reservoir drilling well uniformly mixed according to a certain percentage, be divided into two parts, portion carries out just
Another plugging material is added in drilling fluid and stirs certain time at a certain temperature by beginning PVvalue testing；
(2) rock sample for selecting certain fracture width carries out crack using drilling fluid in step (1) and blocks experiment, every group of experiment weight
Again three times, taking the average value tested three times is the bearing capacity that crack blocks band；
(3) in step (2) drilling fluid repeat carry out crack block experiment, when displacement pressure be slightly less than in step (2) determine
When crack blocks band bearing capacity, terminates crack and block experiment；
(4) the steel rock sample in step (3) is taken out, drying, collects the plugging material in steel rock sample crack, obtain leak stopping before unstability
The friction coefficient curve of material；
(5) the reason of causing fracture-type reservoir plugging material to block band unstability includes 3 kinds: rigid material failure, elastic material lose
Effect and fiber failure；Specific manifestation are as follows:
Compared with plugging material initial friction coefficient curve, before unstability the average coefficient of sliding friction of plugging material be substantially reduced,
The extension fluctuating range of coefficient of friction at any time obviously becomes smaller, then blocks band cause of destabilization as rigid material failure；
Compared with plugging material initial friction coefficient curve, before unstability on the friction coefficient curve of plugging material when the static friction stage
Between be obviously shortened, when average coefficient of sliding friction is substantially reduced, then blocking band cause of destabilization is that elastic material fails；
Occurring apparent coefficient of friction before unstability on the friction coefficient curve of plugging material reduces, and the width that coefficient of friction reduces
When the extension of degree at any time gradually becomes smaller, then blocking band cause of destabilization is fiber failure.
2. fracture-type reservoir plugging material according to claim 1 blocks band cause of destabilization determination method, it is characterised in that:
It is according to the circulation time in actual formation temperature and drilling process that the drilling fluid stirs certain time at a certain temperature
It determines.
3. fracture-type reservoir plugging material according to claim 1 blocks band cause of destabilization determination method, it is characterised in that:
The bearing capacity that the crack blocks band refers to that crack is blocked with displacement pressure corresponding when destroying.
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| CN109633097A (en) * | 2019-01-04 | 2019-04-16 | 中国石油大学(华东) | Cementing concrete ring microcrack sealing agent shut-off capacity evaluating apparatus and evaluation method |
| CN110069878B (en) * | 2019-04-29 | 2019-12-20 | 西南石油大学 | Quantitative scoring and optimizing method for well drilling completion plugging material |
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