CN101849080A - Working pressure field signatures to predict injects the unusual method of well - Google Patents
Working pressure field signatures to predict injects the unusual method of well Download PDFInfo
- Publication number
- CN101849080A CN101849080A CN200880107170A CN200880107170A CN101849080A CN 101849080 A CN101849080 A CN 101849080A CN 200880107170 A CN200880107170 A CN 200880107170A CN 200880107170 A CN200880107170 A CN 200880107170A CN 101849080 A CN101849080 A CN 101849080A
- Authority
- CN
- China
- Prior art keywords
- pressure
- rock stratum
- crackle
- well
- signature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 56
- 239000011435 rock Substances 0.000 claims abstract description 62
- 238000002347 injection Methods 0.000 claims abstract description 39
- 239000007924 injection Substances 0.000 claims abstract description 39
- 239000000243 solution Substances 0.000 claims abstract description 22
- 230000004044 response Effects 0.000 claims abstract description 10
- 208000037656 Respiratory Sounds Diseases 0.000 claims description 87
- 238000003860 storage Methods 0.000 claims description 26
- 230000015572 biosynthetic process Effects 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 239000013535 sea water Substances 0.000 claims description 5
- 230000000007 visual effect Effects 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 10
- 238000012512 characterization method Methods 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 36
- 239000012530 fluid Substances 0.000 description 26
- 230000035882 stress Effects 0.000 description 22
- 238000007789 sealing Methods 0.000 description 15
- 239000007787 solid Substances 0.000 description 11
- 230000007423 decrease Effects 0.000 description 10
- 230000008859 change Effects 0.000 description 7
- 230000007704 transition Effects 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 4
- 239000003129 oil well Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000012065 filter cake Substances 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 2
- 206010011376 Crepitations Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking 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
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011165 process development Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001739 rebound effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
- E21B21/066—Separating solids from drilling fluids with further treatment of the solids, e.g. for disposal
-
- 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
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/005—Waste disposal systems
- E21B41/0057—Disposal of a fluid by injection into a subterranean formation
-
- 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
- E21B49/008—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 by injection test; by analysing pressure variations in an injection or production test, e.g. for estimating the skin factor
Abstract
The present invention relates to a kind of method for designing in response fracturation behavior in the process of rock stratum re-injection landwaste, this method comprises the pressure signature of obtaining one period, the pressure signature of explaining this section period is to determine the fracture behaviour of rock stratum, fracture behaviour based on the rock stratum is determined a solution, and carries out this solution.The invention still further relates to a kind of method of estimating the underground risk of landwaste re-injection operation, this method comprises the pressure signature of obtaining one period, explain that this pressure signature is to determine the fracture behaviour of rock stratum, characterize the risk that interrelates with the fixed fracture behaviour in rock stratum, and carry out solution based on the characterization risk.
Description
Technical field
The embodiment disclosed herein relates generally in definite method of handling the fracture behaviour of stratum or rock stratum of CRI operating period.
Background technology
In drilling well, use drill bit to pierce the thousands of feet of the earth's crust.Usually, oil rig adopts the derrick that extends on offshore boring island.During drill-well operation, the drill pipe joints (joint) after the joint of the drilling pipe that the derrick supporting base end portion connects to the end.When drill bit to underground when deeper advancing, additional drilling pipe is added to " tubing string " or " drill string or drill set " of continuous lengthening.Therefore, drill string comprises the joint of a plurality of drilling pipes.
Fluid " drilling mud " is drawn into lower end or the terminal drill bit that is supported on drill string by drill string or drill set from offshore boring island.Drilling mud makes drill bit lubricated, and takes away and piercing the well drilling detritus that drill bit produces when darker.Carried by the backflow of drilling well mud by this landwaste of well annulus, and return the offshore boring island of surface of stratum.When drilling mud arrived platform, drilling mud was mixed with the industrial known shale and fractionlet and the fragment or the well drilling detritus of rock.In case well drilling detritus, drilling mud and other discarded objects arrive platform, use " mud vibrating screen (shale shaker) " from well drilling detritus, to remove drilling mud usually, make drilling mud to utilize again.Then, remaining well drilling detritus, discarded object, and remaining drilling mud is transferred to storagetank and handles.Under some situation, the drilling mud of particular types for example, drilling mud can not utilize and must be processed again.Usually, handle the place and expendable drilling mud is separated with other discarded objects with well drilling detritus handle by utilizing container that drilling mud is transported to.
The processing of well drilling detritus and drilling mud is a complex environment problem.Well drilling detritus comprises that not only remaining meeting pollutes the drilling mud product of surrounding environment, particularly during drilling well, also may comprise oil and other refuses harmful especially to environment in marine environment.
A kind of method of handling the landwaste of oil-containing pollution is to adopt landwaste re-injection (CRI) operation that landwaste is recycled in stratum or the rock stratum.The basic step of this process comprises that identification is fit to stratum or the rock stratum of injecting; Prepare suitable injection well; Preparation mud comprises consideration such as weight, solid content, pH, factors such as gel; Implement implant operation, comprise and determining and monitoring pump speed, for example volume of time per unit and pressure; And Gai Jing.
Therefore, need a kind of method of in the CRI operation, determining the fracture behaviour of processing rock stratum.
Summary of the invention
On the one hand, the embodiment disclosed herein relates to the method for a kind of design in response fracturation behavior during rock stratum re-injection landwaste, and described method comprises: the pressure signature of obtaining a time period; The pressure signature of explaining this time period is to determine the fracture behaviour of described rock stratum; Fracture behaviour based on described rock stratum is determined a solution; And implement described solution.
On the other hand, the embodiment disclosed herein relates to a kind of method of assessing the underground risk of landwaste re-injection operation, and described method comprises: the pressure signature of obtaining a time period; Explain that described pressure signature is to determine the fracture behaviour of described rock stratum; Characterize the risk relevant with the fracture behaviour of determined described rock stratum; And based on the risk enforcement solution that is characterized.。
By following description and unsettled claim, other aspects of the present invention and advantage will be conspicuous.
Description of drawings
Fig. 1 illustrates the method for the explanation and the unusual identification of pressure signature.
Fig. 2 illustrates the normality pressure signature of carrying out the CRI operation immediately behind the closing well.
Fig. 3 illustrates the pressure signature of expression well bore storage pressure decline behavior.
Fig. 4 illustrates the pressure signature of expression crackle storage pressure decline behavior.
Fig. 5 illustrates the pressure signature of expression falling pressure bounce-back.
Fig. 6 illustrates the logarithmic plot of the pressure signature of injecting on the expression covering layer.
The specific embodiment
On the one hand, the embodiment disclosed herein relates to the pressure behavior of explaining the CRI operation.On the other hand, the embodiment disclosed herein relates to evaluation to underground well system and the potential risks and the influence that cause of rock stratum on every side.
Mud batch processing (that is, will meet the requirements of mud and be injected into and handle in the rock stratum, and wait for a period of time after injection then) allows crackle mechanically sealing to a certain extent, has eliminated gathering of in handling rock stratum pressure.Yet the pressure of handling usually in the rock stratum increased owing to the having (that is, being present in the solid in the well drilling detritus mud) of solid of injecting.
The mud that will be injected into should remain in the parameters calculated scope to reduce the chance that crackle stops up.In order to monitor mud, check that with regular principle rheological parameter (rheological parameter) has predetermined feature to guarantee mud usually.For example, some systems incorporate the continuous measurement to mud viscosity and density into before injection.
Must avoid abandoning harmful discarded object, and must guarantee the maintenance of discarded object or the statutory regulation that strictness is satisfied in sealing to environment.Important hold of considering in during operating process or the sealing factor comprises as follows: the position of the discarded object of injection and the mechanism of storage; Inject the capacity of well bore or annulus; Be continue to inject in present zone or continue to inject in different zones; Whether should bore another and handle well; The required operating parameter that suitable discarded object is held or seals necessity; And in mud transportation to the mud design parameters of solid suspension operations necessary.
The modeling of CRI operation and the prediction of handling the discarded object degree help solving these and hold or the sealing factor, and help guaranteeing the discarded object safety handled and legal hold or seal.The modeling of fracture and prediction also help studying the CRI operation of influence drilling well in the future, for example required well spacing, and rock pressure increases, etc.Thoroughly the storage mechanism in the understanding CRI operation is for predicting the possible range of injecting that meets the requirements of mud and predicting that the processing capacity that injects well is a key.As adopted as in this, the mechanism of storing can refer to mud and be stored in model or method in the rock stratum, comprises, for example, injects the method for rock stratum, injects the method for crackle, crack growth, and the change of geometry of crack.
In case by having ruptured analog computation required closing well (shut-in) time of crack closure, next injection may cause that already present crackle ftractures again, and may produce the branch's crackle away from the well bore near zone of secondary in batches.This situation is by local stress, decided by the change and the rock characteristic that inject the hole pressure cause before.The position of branch's crackle and orientation also depend on the anisotropy of stress.For example, if there is strong stress anisotropy, so crackle closely at interval, yet, if there is no stress anisotropy, crackle wide-scale distribution.In the injection process, how these crackles distribute and shape and scope how to change may be the key factor of determining to handle the processing capacity of well.
Usually, to the modeling of CRI operation and fracturation with simulate not and can provide instant or real-time result in CRI operating period.In addition, modeling and the simulation to the CRI operation do not disclose the reason of fracturation behavior.Yet the embodiment disclosed herein provides the method for the common pressure signature that a kind of observation, identification and explanation observe in CRI operating period.In addition, the embodiment disclosed herein can provide a kind of being used for to design method in order to response fracturation behavior in CRI operating period.
In order in the CRI operation, to improve safety, can monitor continuously at the pressure-responsive between the pressure decrement phase behind injection and the closing well.The injection pressure monitoring of implementing easily that combines with the analysis of depths pressure can assisted diagnosis fracture behaviour during suction and closing well period, and help to estimate crucial crackle and formation parameters.In addition, continuous crackle diagnosis can help to follow the trail of the long-term development and change such as the mechanical parameter of crack length, width and direction, and helps assessment by injecting the entire effect that discarded object causes rock stratum that handle and on every side.
The primary goal of CRI is, by utilize the trouble-free subsurface processes of injecting acquisition Environmental security and drilling wastes intermittently in batches.Therefore, as an effective instrument for underground Risk Identification and sign, the importance of pressure analysis is primary.Can be used to disclose and understand the character of underground risk in the circulation injection period deep explanation of observed various pressure signatures repeatedly, characterize possible reason, and influence the future of assessing all sidedly underground system.Suitably help to guarantee continuous CRI operation, prolong the life-span of injecting well with the explanation of pressure signature timely, and the processing capacity of maximization well.On the contrary, lack underground discarded object injection experiments and ignore tangible pressure signature and may cause unpredictable injection loss potentially, this can increase the expense of filling well once more or cause extra injection well drilling well.
Introduce the method for explaining pressure signature below.Introduce below and be the explanation of five kinds of pressure signatures the most general that the injection period of various CRI engineerings is often observed and recognizes in the whole world.Using that pressure signature is explained can provide better explanation as the imperfect pressure behavior of observation in the CRI operation, potential risks be can estimate and to the influence of underground system, and can a solution or behavior be provided based on the fixed fracture behaviour of rock stratum.
Explain the method for pressure signature
Can be explained to understand better and to solve the imperfect pressure behavior that in CRI operates, observes from the pressure signature of CRI operation.In addition, the operator can estimate the potential risk that caused by CRI operation and to the influence of underground system.In one embodiment, pressure signature can comprise the curve of a plurality of pressure measuring values that record in expression one period.The curve of this expression pressure signature is shown in Fig. 2-6.In another embodiment, pressure signature can be included in record in one period and think shown in the case form a plurality of pressure measuring values.Any those skilled in the art can both recognize that pressure signature can comprise that any known being used to is illustrated in the form of expression of a plurality of pressure measuring values that record in one period.
With reference to Fig. 1, in one embodiment, can determine the pressure signature of one period pre-selected time period in the CRI operation, shown in 120.Pressure signature can determine by any device of the prior art, and can be such as injecting, obtaining continuously with time interval of changing or in the CRI operation behind the closing well, during the crack closure.
Then, explain that for each pressure signature that obtained is to determine the fracture behaviour of rock stratum, shown in 122 time period.Among the embodiment, as described below, pressure signature can contrast with the pressure signature of underground condition that is identified as the expression rock stratum or fracture behaviour.For example, the pressure signature of obtaining immediately behind the closing well can comprise the straight basically line on the pressure droop line.By the pressure signature that will obtain and the pressure signature of having discerned relatively, the operator can determine that pressure that well bore is stored descends and shows that well bore and fluid between the crackle are communicated with and be limited (carrying out detailed discussion below with reference to Fig. 3).
Based on fracture behaviour or the underground behavior explained by pressure signature 122, can determine solution 124 and implement 126 subsequently.For example,, can inject seawater preventing the solid precipitation and/or to alleviate the stress of rock stratum, reduce thus or eliminates to be communicated with and limit to the down-hole if the operator determines to be communicated with restriction between well bore and the rock stratum.
Among the embodiment, the underground risk relevant with fracture behaviour can be represented or characterize with the digital scope of the scope from low to high of expression risk with the scope of risk from low to high.For example, in one embodiment, can explain pressure signature, and the fracture behaviour of definite rock stratum.So, the operator can sort out or characterize the risk of this fracture behaviour.For example, comprise horizontal component if the operator determines crackle, the operator can assess the risk of the well track cross of this crackle horizontal component and design.In this example, the operator can be characterized by excessive risk with this crackle behavior, because it may cause the drilling well failure of planned well.Among other embodiment, pressure signature can be interpreted as representing that the pressure of normality (normal) descends.Similarly, the operator can be a low-risk with this crackle behavior description.Therefore, the solution of determining based on the fracturation behavior can comprise and holds fire or continue the CRI operation.In other embodiments, the underground risk relevant with fracture behaviour can comprise determine such as the well relevant with fracture behaviour handle capacity, expection since the geometry of the crackle of pressure change that fracture behaviour causes and expection change.
The pressure of normality descends
Often observe the pressure (perhaps conventional pressure descends) of normality during behind the closing well.Fig. 2 represents to represent the pressure signature of the example that normality pressure descends.Normality pressure determined by the reaction of moment of crack closure and rock stratum, and open (or unrestricted) is communicated with between indication crackle and the well bore.Usually, between the pressure decrement phase, distinguish out two different time periods: crack closure time period and transition formation time section.
Crackle behavior during the crack closure time period is by fluid loss characteristic (that is, being lost to the fluid volume of rock stratum from crackle) and the control of material balance relation.Pressure during the crack closure time period descends and reflects that crack length changes and height change.Crack penetration increases at first, up to finally falling back back to well bore.Initial crack growth generally is that the redistribution near the large-scale crackle the well bore to the crack tip zone owing to the mud capacity of storing causes.Simultaneously, because pressure reduces (that is, net pressure) in the crackle, height can fall after rise from any higher stress obstacle.The shape of the pressure decline curve by observing pressure signature, can determine to rise to the higher stress obstacle (as, hold or sealing area) the crackle height.For example, the growth to recessed pressure decline characteristic pattern indication expression crackle height does not reach higher stress cracking and holds or sealing area.On the contrary, the pressure decline characteristic pattern that raises up is represented a large amount of crackle height that grows into higher stress obstacle zone.
According to disclosed present embodiment, underground situation can be determined by this pressure decline characteristic pattern.For example, the pressure decline characteristic pattern that raises up may mean that (according to highly falling after rise) redistributes main crackle main body to the fluid in the crackle from the higher stress zone.Usually, when net pressure becomes about 0.4 times of the stress difference that equals between injection zone and the higher stress obstacle zone, the redistribution of fluid from the higher stress zone to main crackle main body in the crackle takes place.By utilizing special time G-function, usually as G value figure, can estimating of fluid efficient from pressure decline characteristic pattern and the fluid leakage coefficient (for example referring to, U.S. Pat 6076046, inventor Vasudevan, at this by with reference to quoting).Yet the application of G-slope equally has a uncertainty with those are seen in the explanation of conventional oil well test data.
Pressure during the transition formation time section descends, and perhaps the pressure behind the crack closure relates to and injects the rock stratum response.During transition formation time section, the pressure-responsive less mechanical response that depends on open crackle that becomes, and depend on instantaneous pressure response in injecting the rock stratum morely.The feature that transition formation time section pressure descends at first (if not all) is decided by the response of the injection rock stratum that is subjected to fluid leakage loss process (fluid migration is to fracture face) interference.During this transition formation time section, reservoir may at first show the linear flow of rock stratum, then is transient performance, and be at last long-term plan radially (pseudo-radial) flow.Pressure during the transition formation time section descends to be provided by the test of standard oil well (promptly, transfer rate and rock pressure) definite traditionally information, and finished the analysis of a series of crackle pressure, it provides one group of complete required data of unique sign by a kind of influence of fracture process development or result.
Usually, the normality pressure signature of CRI operation represent underground system without any potential risk, and can be counted as safe pressure signature.Normal pressure signature can be used to be evaluated at the crackle behavior in the crack closure process, and is used to assess main crackle and formation parameters.Therefore, according to present disclosed embodiment, with as Fig. 2, the pressure signature that the expression normality pressure of CRI operating period descends can be indicated the operator, and the crackle behavior of rock stratum does not hint the risk of underground system.So the operator can continue the CRI operation and need not take further action.
The pressure that well bore is stored descends
Fig. 3 represents to carry out the pressure signature that CRI operates immediately behind the closing well.Well bore storage pressure decline characteristic pattern is represented the restriction between well bore and the rock stratum.May cause this restriction by the sealing that for example brings between well bore and the rock stratum by viscous liquid from previous injection or solid minimizing and precipitation.Also may be by causing this restriction in the accidental mechanical constraint of introducing of decanting point such as cement.The response of well bore storage pressure can also be the result that fluid compresses or expands in a sealed volume.The rock stratum sealing stops the sufficient fluid between crackle and the well bore to be communicated with, and causes the sealed volume in the well bore.As shown in Figure 3, the duration of well bore storage pressure section fall time depends on the compressible degree of artificial restriction and wellbore fluid, and can clearly characterize to be positioned at the straightway that takes place immediately on the pressure droop line behind the closing well, shown in 302.The crackle response is no longer represented in pressure decline at this time durations, and the crackle parameter can not be determined.
In many examples, the caution signal of the restriction that the well bore storage pressure field character representation that shows immediately behind closing well is introduced artificially at the decanting point place.Owing to inject possible sealing at interval, the high risk that potential well stops up is represented in the behavior of observed immediately well bore storage pressure behind closing well.When during the injection suspension time period solids precipitation taking place, the risk that potential oil well stops up increases the weight of.Consider that the oil well obstruction causes the most serious fault in the CRI operation, behavior of observed immediately any well bore storage pressure and injection partially sealed basic reason at interval must be monitored nearly, be estimated and research up hill and dale behind the closing well.
Still with reference to Fig. 3, there is shown in CRI scheme annulus injection period, in the time of with the shell of 95/8 inch of cementing, observed immediately well bore storage pressure field feature behind the closing well.In this example, Shi Ji level is than the height of initial design.As a result, cement bridge joint bore hole is injected part at interval, and introduces artificial restriction at decanting point.This reflects by well bore storage pressure behavior (that is, the straight line portion shown in 302) behind the closing well in pressure signature immediately, and (log confirms by cement evaluation record subsequently.
Therefore, similar according to embodiment of the present disclosure with Fig. 3, represent closing well in CRI operating period after the pressure signature that descends of well bore storage pressure can indicate the operator, well bore is communicated with fluid between the crackle and is limited.Therefore, in one embodiment, the operator can implement seawater and inject with prevention solid precipitation and/or to discharge the stress of rock stratum.Alternatively, acid can pump into the down-hole to remove the normal exchange between mechanicalness restriction and recovery well bore and the crackle.On the whole, such pressure signature is as shown in Figure 3 represented the excessive risk that well or crackle stop up; Therefore, need monitor force field feature nearly, and take correct measure rapidly.
The crackle storage pressure descends
With reference now to Fig. 4,, the pressure signature that the crackle of expression shown in figure storage pressure descends.Crackle storage pressure field feature generally show as pressure in during the time period behind the crack closure and the linear relationship between the time (that is, on the pressure droop line shown in 404 straight line portion).Usually, the crackle storage pressure descends and is caused by pressure kick or vibration in the crack edge that is being limited after the closure or is sealing, shown in 406.The filter cake (filter cake) at the fracture face place that forms by formerly injection (as, residual polymer and solid particle) or the damage of fracture face caused the crack edge sealing.When flow losses causes crackle width deficiency, perhaps when dehydration causes solid mud at the crack tip bridge joint, similar crackle restriction or sealing can also be observed (promptly during end sand fallout (tip screen-out (TSO)), when the gravel or proppant (proppant) the arrival crack tip of high concentration, and interrupted further crack growth).
Suppose that the well bore reserves are less to the influence of whole storage characteristic curve, the pressure behavior is arranged by the fluid reserves in the crackle during crackle period of storage section.The crackle storage pressure mainly due to can transmit effectively at crackle pressure and with respect to inject the rock stratum have higher infiltrative sealing the crackle volume the fluid compression or expand and take place.Usually mechanically observe the crackle storage pressure at crackle, therefore, allow fluid and pressure to redistribute in the crackle near behind the landwaste solid.Influence crackle and store the factor of duration and can comprise crackle and inject permeability and pressure gap between the rock stratum, and the seriousness of the harm that produces at fracture face.
According to present disclosed embodiment, similar with Fig. 4, represent that in CRI operating period the pressure signature that the crackle storage pressure descends can indicate the operator, the crack fracture face may be damaged, thereby causes the crackle sealing.Therefore, in one embodiment, the operator can use reappraise fluid leaks from the crackle to the rock stratum of G-functional digraph, and by implementing extra crackle simulation assessment crackle sealing with the fluid leaks that upgrades and main crackle parameter (as, crackle confining pressure).
The falling pressure bounce-back
Referring now to Fig. 5, the pressure signature of the falling pressure of expression shown in figure bounce-back.In the illustrated embodiment, when injecting interruption or suspending segment length's time, between the pressure decrement phase behind the closing well, observed the bounce-back of surface pressing, shown in 508.Simultaneously, in CRI operating period, inject the drilling well of well or the amplitude that activity in production may increase the pressure bounce-back.Pressure descends and to drop at first below the crackle confining pressure, and continues to descend and begin to heat up up to wellbore fluid, therefore influences the fluid pressure in the well bore.Because the heat that produces between drilling well and/or productive life, wellbore fluid may heat up.When the temperature rising of wellbore fluid, hydrostatic pressure head (hydrostatic head) reduces, and causes that thus surface pressing increases (that is pressure rebound effect).
The rising of fluid temperature (F.T.) is proportional in amplitude that pressure between debounce periods increases and the well bore.Though pressure increases between debounce periods, owing to the influence of thermoelasticity to the rock stratum, crackle can not restarted (re-initiated).That is to say that the variations in temperature of well bore has changed stress state, particularly changed the stress state of well bore near zone.Typically, during ending, heating up and to cause the horizontal stress component that adds in the rock stratum, heats up in the rock stratum of well bore near zone simultaneously and improved normality pressure.Therefore, wellbore fluid heats up, and can cause need be in order to overcome thermal stress additional in the well bore near zone to start the higher critical pressure of crackle.
The risk relevant with excessive wellbore fluid intensification at first relates to the surface and goes up higher injection pressure, and can not inject in default surface pressing extreme value.Like this, among the embodiment, at the intercourse of prolongation, inject by keeping regular seawater, effectively the static wellbore fluid of cooling can reduce near the thermoelastic stress component of well bore.As a result, need less pressure with the startup crackle after the section in break period, and surperficial injection pressure can remain on below the maximum extreme value.
Supratectal injection
With reference now to Fig. 6,, the pressure signature of injecting on the expression covering layer illustrates on logarithmic coordinates.As used herein, covering layer refers to rock stratum or the placer that covers interested subterranean zone or position.If injection pressure is less than covering layer stress, crackle can only be propagated along vertical plane.Yet, under the condition of depth as shallow, injecting or enliven the situation that the rock stratum of thrust fault environment is injected at earth crust structure, covering layer pressure can be minimum main stress bar.Under the condition of this depth as shallow, crackle can be propagated in vertical plane and horizontal plane.This geometry is called as T-shape crackle, and takes place when injection pressure is a bit larger tham covering layer stress.
Pressure-responsive provides in order to determine that crack planes is whether vertical fully or also not comprise the diagnostic base of horizontal component during injection pressure is a bit larger tham covering layer pressure.When crackle pressure is constant and the covering layer stress that approximately is equal to or higher than the rock stratum basically, produced horizontal component (propagating in the horizontal direction), as shown in Figure 6.After injection pressure surpassed covering layer, because the horizontal component of propagating is dominant, the infiltration of vertical component became no longer valid.
The crackle component of level has increased the zone that can be used for fluid loss, has reduced hydraulic efficiency, and has limited the crackle width.Fluid loss and limited crackle width too much on the horizontal component can cause screening too early in injection process or crackle to stop up.Horizontal crackle can provide the overlay area with larger process capacity of expansion.Yet, since with the relevant risk of intersection of locus of the offset drilling of horizontal crackle and design, this horizontal crackle may need at large to assess.The size of covering layer pressure can estimate by density record, and compares with size as the injection pressure of the part of pressure analysis.
According to disclosed present embodiment, similar with Fig. 6, the pressure signature of injecting on the CRI expression covering layer of operating period can be used for determining the geometry of rock stratum crackle.The operator can determine a solution, stops up to stop sand fallout too early in the injection process or crackle to reduce too much fluid loss and/or to increase the crackle width.If pressure signature indication crackle may comprise horizontal component, then the operator can for example redesign the track of following well, to avoid crossing with the horizontal component of crackle.In addition, the operator can make an explanation with the details of regular principle to pressure signature, to avoid too early sand fallout, particularly at the near zone of well bore or in the too early sand fallout at the vertical component of crackle and the intersection point place between the horizontal component.
Advantageously, the embodiment disclosed herein provides the method for the fracture behaviour of rock stratum in a kind of definite CRI operation.Further, the embodiment disclosed herein can provide a kind of by allowing the operator to determine that fracture behaviour in the CRI operation or rock stratum and subsurface picture carry out optimized method to well processing capacity.Among other embodiment disclosed herein, provide a kind of and be used for based on determining a solution by definite fracture behaviour that pressure signature is made an explanation and implementing the method for solution.
Advantageously, the embodiment disclosed herein can provide a kind of method that solves nonideal pressure behavior in CRI operation to the operator, and a kind of CRI of estimation operation the potential risk that underground system and rock stratum are brought and the method for influence.
Though the inventor has described limited embodiment, benefits from other embodiment of invention that one skilled in the art will recognize that of the present invention and can not deviate from this invention disclosed scope.Therefore, scope of invention only should be limited by relevant claim.
Claims (18)
- A design during rock stratum re-injection landwaste to the method for the response of fracturation behavior, described method comprises step:Obtain the pressure signature of a time period;The pressure signature of explaining this time period is to determine the fracture behaviour of described rock stratum;Fracture behaviour based on described rock stratum is determined a solution; AndImplement described solution.
- 2. the method for claim 1, wherein, the step of explaining described pressure signature comprises and determines a kind of for by in the following group that constitutes of described pressure signature: normality pressure descends, the well bore storage pressure descends, the crackle storage pressure descends, inject on falling pressure bounce-back and the covering layer.
- 3. the method for claim 1 also comprises second pressure signature of obtaining a time period after implementing described solution, and determines whether described solution influences described fracture behaviour.
- 4. the method for claim 1 also comprises the underground risk that characterizes described fracture behaviour.
- 5. determine the method for claim 1, wherein that described solution comprises the origin cause of formation of determining described fracture behaviour.
- 6. the method for claim 1 also comprises the visual representation that produces described pressure signature.
- 7. the step of the method for claim 1, wherein explaining described pressure signature comprises described pressure signature and the contrast of known pressure field feature.
- 8. the method for claim 1, wherein described time period comprises the crack closure phase.
- 9. the method for claim 1, wherein described time period comprises behind the closing well intermittently.
- 10. the method for claim 1, wherein described solution comprises to the down-hole injects seawater.
- 11. comprising, the method for claim 1, wherein described solution continues described landwaste re-injection operation.
- 12. a method of assessing the underground risk of landwaste re-injection operation, described method comprises step:Obtain the pressure signature of a time period;Explain that described pressure signature is to determine the fracture behaviour of described rock stratum;Characterize the risk relevant with the fracture behaviour of determined described rock stratum; AndImplement solution based on the risk that is characterized.
- 13. method as claimed in claim 12 wherein, explains that the step of described pressure signature comprises described pressure signature and the contrast of known pressure field feature.
- 14. method as claimed in claim 13, wherein, described known pressure field feature comprises by in the following group that constitutes at least one: normality pressure descends, the well bore storage pressure descends, the crackle storage pressure descends, inject on falling pressure bounce-back and the covering layer.
- 15. method as claimed in claim 12 wherein, characterizes the possibility that the risk relevant with the fracture behaviour of determined described rock stratum comprises the well of determining determined fracture behaviour influence design.
- 16. method as claimed in claim 12 wherein, characterizes the risk relevant with the fracture behaviour of determined described rock stratum and comprises the processing capacity of determining well based on described fracture behaviour.
- 17. method as claimed in claim 12, wherein, described solution comprises to the down-hole injects seawater.
- 18. method as claimed in claim 12, wherein, described solution comprises that continuing described landwaste re-injection operates.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US97209207P | 2007-09-13 | 2007-09-13 | |
| US60/972,092 | 2007-09-13 | ||
| PCT/US2008/075087 WO2009035884A1 (en) | 2007-09-13 | 2008-09-03 | Method of using pressure signatures to predict injection well anomalies |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410356336.1A Division CN104265211A (en) | 2007-09-13 | 2008-09-03 | Method Of Using Pressure Signatures To Predict Injection Well Anomalies |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101849080A true CN101849080A (en) | 2010-09-29 |
Family
ID=40452407
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410356336.1A Pending CN104265211A (en) | 2007-09-13 | 2008-09-03 | Method Of Using Pressure Signatures To Predict Injection Well Anomalies |
| CN200880107170A Pending CN101849080A (en) | 2007-09-13 | 2008-09-03 | Working pressure field signatures to predict injects the unusual method of well |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410356336.1A Pending CN104265211A (en) | 2007-09-13 | 2008-09-03 | Method Of Using Pressure Signatures To Predict Injection Well Anomalies |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US20100314104A1 (en) |
| EP (1) | EP2198115B1 (en) |
| CN (2) | CN104265211A (en) |
| AR (1) | AR068426A1 (en) |
| AU (1) | AU2008299195B2 (en) |
| BR (1) | BRPI0816851A2 (en) |
| CA (1) | CA2699503C (en) |
| CO (1) | CO6270163A2 (en) |
| EA (1) | EA021727B1 (en) |
| MX (1) | MX343973B (en) |
| NO (1) | NO2198115T3 (en) |
| WO (1) | WO2009035884A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103649463A (en) * | 2011-07-11 | 2014-03-19 | 普拉德研究及开发股份有限公司 | System and method for performing wellbore stimulation operations |
| CN110678626A (en) * | 2017-05-24 | 2020-01-10 | 地质力工程公司 | Improvements in or relating to injection wells |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8731890B2 (en) * | 2008-02-22 | 2014-05-20 | M-I L.L.C. | Method of estimating well disposal capacity |
| US8047284B2 (en) * | 2009-02-27 | 2011-11-01 | Halliburton Energy Services, Inc. | Determining the use of stimulation treatments based on high process zone stress |
| US20120325462A1 (en) * | 2011-06-24 | 2012-12-27 | Roussel Nicolas P | Method for Determining Spacing of Hydraulic Fractures in a Rock Formation |
| WO2013070315A1 (en) * | 2011-11-09 | 2013-05-16 | Exxonmobil Upstream Research Company | Drill cuttings re-injection |
| US10578766B2 (en) | 2013-08-05 | 2020-03-03 | Advantek International Corp. | Quantifying a reservoir volume and pump pressure limit |
| CA2937225C (en) | 2013-12-18 | 2024-02-13 | Conocophillips Company | Method for determining hydraulic fracture orientation and dimension |
| MX2017000006A (en) | 2014-06-30 | 2017-06-20 | Advantek Int Corp | Slurrification and disposal of waste by pressure pumping into a subsurface formation. |
| US10385670B2 (en) | 2014-10-28 | 2019-08-20 | Eog Resources, Inc. | Completions index analysis |
| US10385686B2 (en) * | 2014-10-28 | 2019-08-20 | Eog Resources, Inc. | Completions index analysis |
| WO2017039622A1 (en) * | 2015-08-31 | 2017-03-09 | Halliburton Energy Services Inc. | Integrated workflow for feasibility study of cuttings reinjection based on 3-d geomechanics analysis |
| CN106371989A (en) * | 2016-05-06 | 2017-02-01 | 北京中电华大电子设计有限责任公司 | Efficient and secure attack fault injection method adopting batch processing mode |
| GB2578398B (en) | 2017-06-16 | 2021-11-17 | Advantek Waste Man Services Llc | Optimizing waste slurry disposal in fractured injection operations |
| US11500114B2 (en) | 2018-05-09 | 2022-11-15 | Conocophillips Company | Ubiquitous real-time fracture monitoring |
| CN108952700B (en) * | 2018-08-21 | 2022-03-25 | 西南石油大学 | Method for determining anisotropic stratum well wall fracture pressure |
| CN112211622B (en) * | 2019-07-11 | 2023-02-07 | 中国石油天然气股份有限公司 | Method and device for dividing oil reservoir pressure field |
| CA3160203A1 (en) | 2019-11-21 | 2021-05-27 | Conocophillips Company | Well annulus pressure monitoring |
| US11790320B2 (en) * | 2020-06-25 | 2023-10-17 | Schlumberger Technology Corporation | Approaches to creating and evaluating multiple candidate well plans |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5050674A (en) * | 1990-05-07 | 1991-09-24 | Halliburton Company | Method for determining fracture closure pressure and fracture volume of a subsurface formation |
| US6002063A (en) * | 1996-09-13 | 1999-12-14 | Terralog Technologies Inc. | Apparatus and method for subterranean injection of slurried wastes |
| US6076046A (en) * | 1998-07-24 | 2000-06-13 | Schlumberger Technology Corporation | Post-closure analysis in hydraulic fracturing |
| US7440876B2 (en) * | 2004-03-11 | 2008-10-21 | M-I Llc | Method and apparatus for drilling waste disposal engineering and operations using a probabilistic approach |
| US8091625B2 (en) * | 2006-02-21 | 2012-01-10 | World Energy Systems Incorporated | Method for producing viscous hydrocarbon using steam and carbon dioxide |
| US9556720B2 (en) * | 2007-01-29 | 2017-01-31 | Schlumberger Technology Corporation | System and method for performing downhole stimulation operations |
-
2008
- 2008-09-03 BR BRPI0816851 patent/BRPI0816851A2/en active Search and Examination
- 2008-09-03 EA EA201070362A patent/EA021727B1/en not_active IP Right Cessation
- 2008-09-03 EP EP08799094.1A patent/EP2198115B1/en active Active
- 2008-09-03 WO PCT/US2008/075087 patent/WO2009035884A1/en active Application Filing
- 2008-09-03 NO NO08799094A patent/NO2198115T3/no unknown
- 2008-09-03 CN CN201410356336.1A patent/CN104265211A/en active Pending
- 2008-09-03 MX MX2010002779A patent/MX343973B/en active IP Right Grant
- 2008-09-03 CN CN200880107170A patent/CN101849080A/en active Pending
- 2008-09-03 AU AU2008299195A patent/AU2008299195B2/en not_active Ceased
- 2008-09-03 US US12/677,719 patent/US20100314104A1/en not_active Abandoned
- 2008-09-03 CA CA2699503A patent/CA2699503C/en active Active
- 2008-09-12 AR ARP080103969A patent/AR068426A1/en not_active Application Discontinuation
-
2010
- 2010-03-12 CO CO10029656A patent/CO6270163A2/en not_active Application Discontinuation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103649463A (en) * | 2011-07-11 | 2014-03-19 | 普拉德研究及开发股份有限公司 | System and method for performing wellbore stimulation operations |
| CN103649463B (en) * | 2011-07-11 | 2017-07-28 | 普拉德研究及开发股份有限公司 | System and method for performing well stimulation job |
| CN110678626A (en) * | 2017-05-24 | 2020-01-10 | 地质力工程公司 | Improvements in or relating to injection wells |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2198115B1 (en) | 2017-08-02 |
| EP2198115A4 (en) | 2015-12-02 |
| MX2010002779A (en) | 2010-04-07 |
| BRPI0816851A2 (en) | 2015-03-17 |
| AR068426A1 (en) | 2009-11-18 |
| NO2198115T3 (en) | 2017-12-30 |
| MX343973B (en) | 2016-11-30 |
| CO6270163A2 (en) | 2011-04-20 |
| US20100314104A1 (en) | 2010-12-16 |
| CN104265211A (en) | 2015-01-07 |
| CA2699503C (en) | 2015-05-05 |
| EP2198115A1 (en) | 2010-06-23 |
| WO2009035884A1 (en) | 2009-03-19 |
| AU2008299195B2 (en) | 2012-08-23 |
| EA021727B1 (en) | 2015-08-31 |
| EA201070362A1 (en) | 2010-10-29 |
| CA2699503A1 (en) | 2009-03-19 |
| AU2008299195A1 (en) | 2009-03-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101849080A (en) | Working pressure field signatures to predict injects the unusual method of well | |
| MX2014012049A (en) | Methods and systems for real-time monitoring and processing of wellbore data. | |
| NO340875B1 (en) | Method of determining well deposition capacity | |
| US9175555B2 (en) | Fluid injection completion techniques | |
| AU2021201098B2 (en) | Optimizing waste slurry disposal in fractured injection operations | |
| Mukherjee et al. | Successful control of fracture height growth by placement of artificial barrier | |
| CN110678626A (en) | Improvements in or relating to injection wells | |
| CN115952620A (en) | Shale reservoir fracturing prevention construction method and key fracture control material | |
| CN109899050A (en) | Form the bed gas reservoir fracturing process of complex fracture network | |
| Abou-Sayed et al. | Ultimate capacity of a disposal well in drilling waste injection operations | |
| US11215034B2 (en) | Controlling redistribution of suspended particles in non-Newtonian fluids during stimulation treatments | |
| Oyeneyin | Fundamental Principles of Management of Reservoirs with Sanding Problems | |
| Dobkins | Procedures, Results, and Benefits of Detailed Fracture Treatment Analysis | |
| Gaurina-Medjimurec | The underground injection of drilling waste | |
| Ruslan et al. | Integrated approach to sand management in matured field operations | |
| US11732579B2 (en) | Method to tailor cement properties and optimize injection schedule for near wellbore integrity in carbon storage/injection wells | |
| Bagci | Fracture Modeling for Cap Rock Integrity and Completion Evaluation in Produced Water Re-injection Wells | |
| Fletcher et al. | Optimizing hydraulic fracture length to prevent formation failure in oil and gas reservoirs | |
| Adams | A comprehensive review of wellbore breathing | |
| CN117272662A (en) | Pressure relief evaluation system for fracturing area of ground horizontal well | |
| Udebhulu | Mechanistic Models for Predicting Sand Production: A Case Study of Niger Delta Wells | |
| Zaki et al. | Surveillance Modeling and Operational Controls Ensure Integrity of Alaska's Grind and Inject Operations II |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20100929 |
|
| RJ01 | Rejection of invention patent application after publication |