CN108019203A - Recognition methods is linked up in a kind of separate stratum fracfturing crack - Google Patents
Recognition methods is linked up in a kind of separate stratum fracfturing crack Download PDFInfo
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- CN108019203A CN108019203A CN201610934384.3A CN201610934384A CN108019203A CN 108019203 A CN108019203 A CN 108019203A CN 201610934384 A CN201610934384 A CN 201610934384A CN 108019203 A CN108019203 A CN 108019203A
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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
- 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
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
Abstract
The invention discloses a kind of separate stratum fracfturing crack to link up recognition methods, it is characterised in that including：When separate stratum fracfturing is constructed, obtain temperature, the pressure parameter of each layer, by the temperature of each layer of acquisition, the curve that temperature is made in pressure parameter, pressure changes over time, the synchronous intensity of variation of temperature and/or pressure curve during according to adjacent two formation breakdown, the communication degree in the crack on adjacent two stratum of preliminary judgement.The present invention is monitored using separate stratum fracfturing pressure and temp, using " uniqueness " of every stressor layer and temperature during pressure break, can not only be enrolled down-hole pressure data and is used for fracture evaluation, can also effectively identify that fracturing fracture is exchanged information.
Description
Technical field
The present invention relates to field of oilfield exploitation is belonged to, recognition methods is linked up in more particularly to a kind of separate stratum fracfturing crack.
Background technology
In the hydraulic fracturing job of the fine and close oil and gas reservoir such as transformation shale, the communication of hydraulic fracture how is assessed and predicted
Degree is one of key link of fracturing reform engineering.
Statistics shows that yield after separate stratum fracfturing pressure is generally 2.2 times with block with the general pressure break in layer position.But in statistics
During, it has been found that the effect for having about 25% or so separate stratum fracfturing well is equal to general pressure break.According to well temperature after the well pressure of part
Analysis, it is believed that there is the phenomenon of " crack communication ", the liquid overwhelming majority that result in separate stratum fracfturing and enter communication layer,
It is not carried out the effect of separate stratum fracfturing.The reason for liquid " communication ", is several nothing more than having：Packer failure, alter inside groove and stratum
Link up.Evaluation to this at present mainly has the gentle tracer haydite of well after the preceding pressure of pressure.Whether well temperature testing, or tracer haydite,
It is required for employing test equipment, it is costly.
The content of the invention
It is an object of the present invention in view of the deficiencies of the prior art, there is provided recognition methods is linked up in a kind of separate stratum fracfturing crack.
The technical solution adopted by the present invention is as follows.
Recognition methods is linked up in a kind of separate stratum fracfturing crack, including：When separate stratum fracfturing is constructed, temperature, the pressure of each layer are obtained
Force parameter, by the temperature of each layer of acquisition, the curve that temperature is made in pressure parameter, pressure changes over time, according to adjacent two places
The synchronous intensity of variation of temperature and/or pressure curve when lamination is split, the communication degree in the crack on adjacent two stratum of preliminary judgement.
Further, the variation tendency of the temperature curve when adjacent two formation breakdown or pressure curve is different, can tentatively sentence
The crack on fixed adjacent two stratum is not linked up；The variation tendency of temperature curve or pressure curve when adjacent two formation breakdown
It is identical, can the crack on preliminary judgement adjacent two stratum linked up.
Further, before separate stratum fracfturing construction, by pressure temperature meter with separate stratum fracfturing operating tool string lower going-into-well, pressure break is being carried out
During construction, press temperature meter to carry out dynamic monitoring to pressing crack construction, obtain the corresponding temperature of each layer, pressure parameter and stored.
Further, in adjacent two stratum, during pressure break lower floor, since fluid passes through same tubing string passage, temperature is all
There is a very big reduction, formed one " caviton "；Ball-off lower floor, during pressure break upper strata, upper and lower two layers is two independent
Pressure and temp system, fluid is only by upper strata tubing string, therefore the temperature change on upper strata forms two " cavitons ", and lower floor only has
One " caviton ", at this time it is believed that the variation tendency of temperature curve during adjacent two formation breakdown is different.
Further, when the temperature on adjacent two stratum or the variation tendency of pressure curve is identical and the pressure curve on two stratum exists
When pressure differential on pressure break start to finish each time point is less than 10% of the fluid column difference between the time point upper two pressures temperature meter,
It can determine that the crack on adjacent two stratum is seriously linked up；When the temperature on adjacent two stratum or the variation tendency phase of pressure curve
Pressure differential of same and two stratum the pressure curves on pressure break start to finish each time point is more than or equal to two pressure on the time point
Temperature meter between fluid column difference 10% and less than the time point it is upper two pressure temperature count between fluid column difference 30% when, can tentatively sentence
The medium communication in crack on fixed adjacent two stratum.
Further, when adjacent two formation breakdown, the temperature curve on two stratum synchronously changes and pressure curve also synchronously becomes
Change, illustrate packer failure or alter groove, crack can determine that the crack on adjacent two stratum by being linked up in pipe or outside pipe at this time
Linked up through serious.
Further, when adjacent two formation breakdown, temperature curve synchronously change but the asynchronous change of pressure curve on two stratum
Change, can preliminary judgement adjacent two stratum the medium communication in crack or serious link up.
Further, when the pressure differential of the pressure curve on pressure break start to finish each time point on two stratum is more than or equal to should
Time point upper two presses 10% of the fluid column difference between temperature meter and less than the fluid column difference between the time point upper warm meter of two pressures
When 30%, can preliminary judgement adjacent two stratum the medium communication in crack；When the pressure curve on two stratum is in pressure break start to finish
Pressure differential on each time point be less than the time point upper two pressures temperature count between fluid column difference 10% when, can determine that this adjacent two
The crack on stratum is seriously linked up.
Further, when the crack on adjacent two stratum of preliminary judgement is not linked up and adjacent two stratum stratum and pressure
Split parameter it is basically identical when, further include that to recover trend by the temperature of the post-fracturing temperature curve on adjacent two stratum further true
Recognize the step of crack on adjacent two stratum is exchanged information；When the temperature of lower floor in adjacent two stratum is recovered soon with upper strata, sentence
Fixed adjacent two formation fracture is not linked up；When the temperature of lower floor in adjacent two stratum recovers unhappy and upper strata, judging should
Adjacent two formation fracture has been linked up and linked up links up to be slight；
When the crack on adjacent two stratum of preliminary judgement has been linked up and adjacent two stratum stratum and fracturing parameter
When basically identical, further include by the temperature of the post-fracturing temperature curve on adjacent two stratum recover trend further confirm that it is adjacent
The step of crack on two stratum is exchanged information；When the temperature of the post-fracturing temperature curve on adjacent two stratum recovers trend difference
When, illustrate that the fluid of adjacent two stratum at the middle and upper levels does not enter into lower floor, judge that adjacent two formation fracture has been linked up and ditch
Lead to and linked up to be slight；When the temperature recovery trend of the post-fracturing temperature curve on adjacent two stratum is identical, illustrate that this is adjacent
The fluid of two stratum at the middle and upper levels comes into lower floor, judges that adjacent two formation fracture has been linked up and linked up and is passed to for medium ditch
On.
Further, the stratum on adjacent two stratum and fracturing parameter it is basically identical refer to thickness, lithology, injection liquid measure and
Discharge capacity is basically identical.
The beneficial effects of the invention are as follows：Monitored using separate stratum fracfturing pressure and temp, utilize every stressor layer and temperature during pressure break
" uniqueness ", i.e., each layer of pressure and temperature trend, feature etc. are all unique, can not only enroll down-hole pressure data
For fracture evaluation, it can also effectively identify that fracturing fracture is exchanged information.During oil/gas well separate stratum fracfturing, pass through monitoring
Whether pressure, the temperature change in shaft bottom, can identify the crack of generation in stratum internal communication, so as to be segmented for later pressure break
Selection provide foundation.
Brief description of the drawings
Fig. 1 is monitoring tubing string schematic diagram.
Fig. 2 is the tubular column structure figure of certain well.
Fig. 3 is the bottom hole temperature (BHT) variation diagram on the upper strata on adjacent two stratum measured by tubing string shown in Fig. 2.
Fig. 4 is the bottom hole temperature (BHT) variation diagram of the lower floor on adjacent two stratum measured by tubing string shown in Fig. 2.
Fig. 5 is the tubular column structure figure of certain well.
Fig. 6 is the bottom hole temperature (BHT) on the upper strata on adjacent two stratum measured by tubing string shown in Fig. 5, pressure variation.
Fig. 7 is the bottom hole temperature (BHT) of the lower floor on adjacent two stratum measured by tubing string shown in Fig. 5, pressure variation.
Pressure-time curve comparison diagram before and after two formation breakdowns when Fig. 8 is adjacent two stratum communication.
Fig. 9 is adjacent two formation temperatures recovery trend comparison diagram after closing well.
Figure 10 is adjacent two formation temperatures recovery trend comparison diagram after closing well.
Figure 11 is temperature-time curve comparison diagram before and after adjacent two formation breakdown.
Embodiment
In the following, the present invention will be further described in conjunction with the accompanying drawings and embodiments.
Embodiment 1.Recognition methods is linked up in a kind of separate stratum fracfturing crack, including：When separate stratum fracfturing is constructed, each layer is obtained
Temperature, pressure parameter, by the temperature of each layer of acquisition, the curve that temperature is made in pressure parameter, pressure changes over time.It is being layered
Before pressing crack construction, by pressure temperature meter with separate stratum fracfturing operating tool string lower going-into-well, when carrying out pressing crack construction, temperature meter is pressed to apply pressure break
Work carries out dynamic monitoring, obtains the corresponding temperature of each layer, pressure parameter and is stored.
When adjacent two formation breakdown, the temperature curve on two stratum synchronously changes and pressure curve also synchronously changes, explanation
Packer fails or alters groove, and crack can determine that the crack on adjacent two stratum is serious by being linked up in pipe or outside pipe at this time
Link up.
When adjacent two formation breakdown, temperature curve synchronously change but the asynchronous change of pressure curve on two stratum can be first
Step judges the medium communication in crack on adjacent two stratum or serious communication.
When the pressure differential of the pressure curve on pressure break start to finish each time point on two stratum is more than or equal to the time point
It is upper two pressure temperature meter between fluid column difference 10% and less than the time point it is upper two pressure temperature count between fluid column differences 30% when, can
The medium communication in crack on preliminary judgement adjacent two stratum；When the pressure curve on two stratum is at pressure break start to finish each time point
On pressure differential be less than the time point it is upper two pressure temperature count between fluid column difference 10% when, can determine that splitting for adjacent two stratum
Seam is seriously linked up.
When the crack on adjacent two stratum of preliminary judgement is not linked up and adjacent two stratum stratum and fracturing parameter
When basically identical, further include by the temperature of the post-fracturing temperature curve on adjacent two stratum recover trend further confirm that it is adjacent
The step of crack on two stratum is exchanged information；When the temperature of lower floor in adjacent two stratum is recovered soon with upper strata, the phase is judged
Adjacent two formation fractures are not linked up；When the temperature of lower floor in adjacent two stratum recover it is unhappy with upper strata when, judge this adjacent two
Formation fracture has been linked up and linked up links up to be slight；
When the crack on adjacent two stratum of preliminary judgement has been linked up and adjacent two stratum stratum and fracturing parameter
When basically identical, further include by the temperature of the post-fracturing temperature curve on adjacent two stratum recover trend further confirm that it is adjacent
The step of crack on two stratum is exchanged information；When the temperature of the post-fracturing temperature curve on adjacent two stratum recovers trend difference
When, illustrate that the fluid of adjacent two stratum at the middle and upper levels does not enter into lower floor, judge that adjacent two formation fracture has been linked up and ditch
Lead to and linked up to be slight；When the temperature recovery trend of the post-fracturing temperature curve on adjacent two stratum is identical, illustrate that this is adjacent
The fluid of two stratum at the middle and upper levels comes into lower floor, judges that adjacent two formation fracture has been linked up and linked up and is passed to for medium ditch
On.
The stratum on adjacent two stratum and fracturing parameter is basically identical refers to thickness, lithology, injection liquid measure and discharge capacity base
This is consistent.
Embodiment 2.Recognition methods is linked up in a kind of separate stratum fracfturing crack, including：When separate stratum fracfturing is constructed, each layer is obtained
Temperature, pressure parameter, by the temperature of each layer of acquisition, the curve that temperature is made in pressure parameter, pressure changes over time, according to phase
The synchronous intensity of variation of temperature or pressure curve during adjacent two formation breakdown, the communication journey in the crack on adjacent two stratum of preliminary judgement
Degree.
The variation tendency of temperature curve or pressure curve when adjacent two formation breakdown is different, can preliminary judgement this is adjacent
The crack on two stratum is not linked up；The variation tendency of temperature curve or pressure curve when adjacent two formation breakdown is identical, can
The crack on preliminary judgement adjacent two stratum has been linked up.
Before separate stratum fracfturing construction, will pressure temperature meter with separate stratum fracfturing operating tool string lower going-into-well, when carrying out pressing crack construction,
Pressure temperature meter carries out dynamic monitoring to pressing crack construction, obtains the corresponding temperature of each layer, pressure parameter and is stored.
In adjacent two stratum, during pressure break lower floor, since fluid passes through same tubing string passage, temperature has one very
Big reduction, forms one " caviton "；Ball-off lower floor, during pressure break upper strata, upper and lower two layers is two independent pressure and temps
System, fluid is only by upper strata tubing string, therefore the temperature change on upper strata forms two " cavitons ", and lower floor only have one it is " recessed
Son ", at this time it is believed that the variation tendency of temperature curve during adjacent two formation breakdown is different.
When the temperature on adjacent two stratum or the variation tendency of pressure curve is identical and the pressure curve on two stratum is opened in pressure break
When beginning to the pressure differential terminated on each time point to press the fluid column between temperature meter poor equal to two（It can be floated in ± 10% fluid column difference
It is dynamic）, can determine that the crack on adjacent two stratum is seriously linked up；When the temperature on adjacent two stratum or the change of pressure curve become
The pressure differential that gesture is identical and the pressure curve on two stratum is on pressure break start to finish each time point is equal between two pressure temperature meters
When fluid column is poor（It can float in 10%-30% fluid column differences）, can preliminary judgement adjacent two stratum the medium communication in crack.
When the crack on adjacent two stratum of preliminary judgement is not linked up and adjacent two stratum stratum and fracturing parameter
When basically identical, further include by the temperature of the post-fracturing temperature curve on adjacent two stratum recover trend further confirm that it is adjacent
The step of crack on two stratum is exchanged information；When the temperature of lower floor in adjacent two stratum is recovered soon with upper strata, the phase is judged
Adjacent two formation fractures are not linked up；When the temperature of lower floor in adjacent two stratum recover it is unhappy with upper strata when, judge this adjacent two
Formation fracture has been linked up and linked up links up to be slight；
When the crack on adjacent two stratum of preliminary judgement has been linked up and adjacent two stratum stratum and fracturing parameter
When basically identical, further include by the temperature of the post-fracturing temperature curve on adjacent two stratum recover trend further confirm that it is adjacent
The step of crack on two stratum is exchanged information；When the temperature of the post-fracturing temperature curve on adjacent two stratum recovers trend difference
When, illustrate that the fluid of adjacent two stratum at the middle and upper levels does not enter into lower floor, judge that adjacent two formation fracture has been linked up and ditch
Lead to and linked up to be slight；When the temperature recovery trend of the post-fracturing temperature curve on adjacent two stratum is identical, illustrate that this is adjacent
The fluid of two stratum at the middle and upper levels comes into lower floor, judges that adjacent two formation fracture has been linked up and linked up and is passed to for medium ditch
On.
The stratum on adjacent two stratum and fracturing parameter it is basically identical refer to thickness, lithology, injection liquid measure and discharge capacity etc.
It is basically identical.
Monitored using separate stratum fracfturing pressure and temp, each layer of pressure and temperature trend, feature etc. be all it is unique, as
With the same without the identical leaf of two panels in the world.It is using " uniqueness " of every stressor layer and temperature during pressure break, i.e., each
Pressure and temperature trend, the feature etc. of layer are all unique, can not only enroll down-hole pressure data and be used for fracture evaluation, may be used also
Effectively to identify that fracturing fracture is exchanged information.During oil/gas well separate stratum fracfturing, point several layers of pressure breaks are warm it is necessary to put several pressures
Meter, each layer have respective pressure temperature meter to monitor the change of the pressure and temp of this layer.Become by the pressure at monitoring well bottom, temperature
Change, whether can identify the crack of generation in stratum internal communication, so as to provide foundation for the selection that later pressure break is segmented.
Embodiment 3.Recognition methods is linked up in a kind of separate stratum fracfturing crack, including：When separate stratum fracfturing is constructed, each layer is obtained
Temperature, pressure parameter, by the temperature of each layer of acquisition, the curve that temperature is made in pressure parameter, pressure changes over time, according to phase
The synchronous intensity of variation of temperature and pressure curve during adjacent two formation breakdown, the communication journey in the crack on adjacent two stratum of preliminary judgement
Degree.Comprise the following steps that：
1st, according to FRACTURING DESIGN, pressure temperature meter parameter is set；
2nd, Fracturing Monitoring tubing string enters well；
3rd, pressing crack construction；
4th, tubing string is proposed, playback pressure temperature counts；
5th, explained according to pressure and temp data.
Before construction, by pressure temperature meter with separate stratum fracfturing operating tool string lower going-into-well, when carrying out pressing crack construction, temperature meter pair is pressed
Pressing crack construction carries out dynamic monitoring, obtains corresponding pressure parameter and is stored.After construction, temperature meter is pressed with fracturing string
Take out, then data are played back and explained.
Monitoring device is made of support cylinder and pressure temperature meter.The left side of Fig. 1 is the structure diagram of monitoring device, and pressure gauge pressure is warm
Meter is installed in monitoring device.The schematic diagram of monitoring tubing string is illustrated on the right side of Fig. 1.Wherein, 1- monitoring devices, 2- pressure temperature meters,
3- hydraulic anchors, 4- packers, the setting ball seats of 5-, 6- support cylinders.
Down-hole pressure temperature is most true and reliable data source, can more truly be reflected in fracturing process, the extension in crack
With extension, during intuitively judging separate stratum fracfturing, either with or without packer failure, groove, crack communication etc. are altered.Crack, which is linked up, to be referred to
Two layers of crack connection, it is desirable to cannot connect.If layering failure, the whereabouts of invalid liquid and big can be qualitatively judged
The ratio of cause.Layering failure, generally referred to as packer failure, alter groove, crack communication.At this time, the fracturing fluid meeting of positive construction layer
There is the crack for greatly entering and linking up, this partial open liquid is exactly invalid liquid, is changed according to the temperature, pressure of pressure temperature meter,
It may determine that this partially liq is gone in the crack of which layer, and ratio substantially.
Recognition methods is as follows：
1st, whether crack is linked up
Each layer of pressure and temperature is all unique.If there is temperature curve, synchronously change, pressure curve are also synchronous
Change, illustrates that packer fails or alters groove, and crack can be classified as seriously linking up, specific original by linking up in pipe or outside pipe at this time
Because that can be judged by the dependence test in later stage.Change if there is the asynchronous change of temperature but Simultaneous Pressure, explanation is to split
Seam is linked up, and is linked up and is divided into serious communication, medium communication again.If two layers are not linked up, then the two layers are for other side
It is each self-enclosed system, respective pressure and temp is different；If linked up completely, the two closed systems are connected into one
Body, then the change of its temperature, pressure can be synchronous.That is the pressure rise on upper strata, the pressure of lower floor also raise, change one
Cause.
Fig. 2-4 keeps a grip on structure and bottom hole temperature (BHT) variation diagram for certain well.Two layers of pressure break, during pressure break lower floor, since fluid passes through
Same tubing string passage is crossed, therefore temperature has a very big reduction, is formed one " caviton ".According to design, under ball-off
Layer, is for upper and lower two layers two independent pressure and temp systems during pressure break upper strata, and fluid is only by upper strata tubing string, therefore upper strata
Temperature change forms two " cavitons ", and lower floor only has one " caviton ", and feature is clearly." caviton " refers to curve
One concave bottom.
Fig. 5-7 is the tubular column structure and bottom pressure temperature variation of two layers of pressure break.Red line is temperature curve, and blue line is pressure
Force curve.According to design, after lower floor's pressure break terminates, ball-off lower floor, upper and lower two layers is each independent pressure and temp system
System, but really the pressure and temp change of the two is synchronous, and this just illustrates that the two has been linked up, as long as i.e. Simultaneous Pressure, just
Illustrate that crack is linked up.The two pressure data is synchronous in Fig. 8, illustrates seriously to link up.Whether temperature is synchronous, it can be determined that link up
Mode, be outer to alter groove by stratum internal communication or by linking up or managing in pipe and lead to.It is envelope when pressure and temp thoroughly synchronization
Every device tool failures.
2nd, the analysis of invalid liquid
After two layers is linked up, the liquid on pressure break upper strata enters lower floor, causes the correctional effect to upper strata poor.Supernatant liquid into
Enter the amount of lower floor, trend can be recovered by temperature to qualitatively judge out.Following example, be bilevel stratum and
Fracturing parameter is basically identical, makes an appraisal on this basis.
If crack is not linked up, it may be that the temperature resume speed of lower floor soon with upper strata.As shown in Figure 9, Figure 10
It is then that lower floor's temperature recovery trend is less than upper strata, illustrates two layers after linking up, upper strata has small part liquid to enter lower floor, causes lower floor
Temperature recover trend it is slightly lower.Shown in Figure 11, after closing well, the temperature of lower floor recovers trend and is significantly lower than upper strata, qualitatively judges, on
The liquid of layer, which has, greatly enters lower floor.The change of temperature trend, the factor being related to is very much, can only qualitatively sentence at present
It is disconnected.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (10)
1. recognition methods is linked up in a kind of separate stratum fracfturing crack, it is characterised in that including：When separate stratum fracfturing is constructed, each layer is obtained
Temperature, pressure parameter, by the temperature of each layer of acquisition, the curve that temperature is made in pressure parameter, pressure changes over time, according to phase
The synchronous intensity of variation of temperature and/or pressure curve during adjacent two formation breakdown, the ditch in the crack on adjacent two stratum of preliminary judgement
Logical degree.
2. recognition methods is linked up in a kind of separate stratum fracfturing crack as claimed in claim 1, it is characterised in that：When adjacent two places are laminated
The variation tendency of temperature curve or pressure curve when splitting is different, can the crack on preliminary judgement adjacent two stratum do not link up；
The variation tendency of temperature curve or pressure curve when adjacent two formation breakdown is identical, can preliminary judgement adjacent two stratum
Crack has been linked up.
3. recognition methods is linked up in a kind of separate stratum fracfturing crack as claimed in claim 2, it is characterised in that：Construct in separate stratum fracfturing
Before, will pressure temperature meter with separate stratum fracfturing operating tool string lower going-into-well, when carrying out pressing crack construction, pressure temperature is counted to pressing crack construction into action
State monitors, and obtains the corresponding temperature of each layer, pressure parameter and is stored.
4. recognition methods is linked up in a kind of separate stratum fracfturing crack as claimed in claim 3, it is characterised in that：On adjacent two stratum
In, during pressure break lower floor, since fluid passes through same tubing string passage, temperature has a very big reduction, formed one it is " recessed
Son "；Ball-off lower floor, during pressure break upper strata, upper and lower two layers is two independent pressure and temp systems, and fluid is only managed by upper strata
Column, the temperature change on upper strata forms two " cavitons ", and lower floor only has one " caviton ", at this time it is believed that the lamination of adjacent two places
The variation tendency of temperature curve when splitting is different.
5. recognition methods is linked up in a kind of separate stratum fracfturing crack as claimed in claim 3, it is characterised in that：When adjacent two stratum
Temperature or the pressure that the variation tendency of pressure curve is identical and the pressure curve on two stratum is on pressure break start to finish each time point
When force difference is less than 10% of the fluid column difference between upper two pressures temperature meter of each time point, the crack on adjacent two stratum can determine that
It is serious to link up；When the temperature on adjacent two stratum or the variation tendency of pressure curve is identical and the pressure curve on two stratum is opened in pressure break
Begin to the pressure differential terminated on each time point upper more than or equal to each time point two to press 10% of the fluid column difference between temperature meter and be less than
Fluid column difference between each time point upper two pressures temperature meter 30% when, can preliminary judgement adjacent two stratum the medium communication in crack.
6. recognition methods is linked up in a kind of separate stratum fracfturing crack as claimed in claim 2, it is characterised in that：When adjacent two places are laminated
When splitting, the temperature curve on two stratum synchronously changes and pressure curve also synchronously changes, and illustrates packer failure or alters groove, splits at this time
Seam passes through in pipe or the outer communication of pipe, can determine that the crack on adjacent two stratum is seriously linked up.
7. recognition methods is linked up in a kind of separate stratum fracfturing crack as claimed in claim 2, it is characterised in that：When adjacent two places are laminated
When splitting, the temperature curve on two stratum synchronously change but the asynchronous change of pressure curve, can preliminary judgement adjacent two stratum split
Stitch medium communication or serious communication.
8. recognition methods is linked up in a kind of separate stratum fracfturing crack as claimed in claim 7, it is characterised in that：When the pressure on two stratum
The fluid column that pressure differential of the curve on pressure break start to finish each time point is more than or equal on the time point between two pressure temperature meters is poor
Value 10% and less than the time point upper two pressures temperature count between fluid column difference 30% when, can preliminary judgement adjacent two stratum
The medium communication in crack；When the pressure differential of the pressure curve on pressure break start to finish each time point on two stratum is less than the time point
It is upper two pressure temperature meter between fluid column difference 10% when, can determine that the crack on adjacent two stratum is seriously linked up.
9. recognition methods is linked up in a kind of separate stratum fracfturing crack as described in any claims of claim 1-8, it is characterised in that：
When the crack on adjacent two stratum of preliminary judgement is not linked up and the stratum on adjacent two stratum and fracturing parameter are basic
When consistent, further include and adjacent two places are further confirmed that by the temperature recovery trend of the post-fracturing temperature curve on adjacent two stratum
The step of crack of layer is exchanged information；When in adjacent two stratum lower floor temperature recover soon with upper strata when, judge this adjacent two
Formation fracture is not linked up；When the temperature of lower floor in adjacent two stratum recovers unhappy and upper strata, adjacent two stratum is judged
Crack has been linked up and linked up to be linked up to be slight；
When the crack on adjacent two stratum of preliminary judgement has been linked up and the stratum on adjacent two stratum and fracturing parameter are basic
When consistent, further include and adjacent two places are further confirmed that by the temperature recovery trend of the post-fracturing temperature curve on adjacent two stratum
The step of crack of layer is exchanged information；When the temperature of the post-fracturing temperature curve on adjacent two stratum recovers trend difference, say
The bright fluid of adjacent two stratum at the middle and upper levels does not enter into lower floor, and it is light to judge that adjacent two formation fracture has been linked up and linked up
Micro- communication；When the temperature recovery trend of the post-fracturing temperature curve on adjacent two stratum is identical, illustrate adjacent two stratum
Fluid at the middle and upper levels comes into lower floor, judges that adjacent two formation fracture has been linked up and linked up to be more than medium communication.
10. recognition methods is linked up in a kind of separate stratum fracfturing crack as claimed in claim 9, it is characterised in that：The adjacent two places
The stratum and fracturing parameter of layer are basically identical to refer to that thickness, lithology, injection liquid measure and discharge capacity are basically identical.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110056336A (en) * | 2019-05-31 | 2019-07-26 | 西南石油大学 | A kind of shale air cleft network pressure splits operation pressure curve automatic diagnosis method |
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