CN110529089A - A kind of open-hole horizontal well refracturing method - Google Patents
A kind of open-hole horizontal well refracturing method Download PDFInfo
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- CN110529089A CN110529089A CN201910891487.XA CN201910891487A CN110529089A CN 110529089 A CN110529089 A CN 110529089A CN 201910891487 A CN201910891487 A CN 201910891487A CN 110529089 A CN110529089 A CN 110529089A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
The present invention provides a kind of open-hole horizontal well refracturing methods, belong to oil-gas mining field.Open-hole horizontal well refracturing method provided by the invention can be realized fixed point transformation, and construction efficiency is high, excavates production capacity in the effective reservoir that Cong Yici pressure break had not been developed, and blocking agent has presence, it is capable of forming inierpeneirating network structure, stifled slurry solidified body has micro-expansibility energy；The plugging strength of blocking agent is high；Blocking agent be fully achieved or more than under the elasticity modulus of high-quality water mud in middle Cementing cement standard in 5500 index；The working security of blocking agent is high.
Description
Technical field
The present invention relates to oil-gas mining technical field more particularly to a kind of open-hole horizontal well refracturing methods.
Background technique
Horizontal well fracturing is the effective way for improving oil-gas reservoir well yield.However, as exploitation is gradually goed deep into, by
The factors such as the low transformation degree of first pressure break, the reduction of Fracture System flow conductivity influence, and part low yield horizontal well occur, need to be using weight
Pressure break is answered to restore well yield, suggestions for improvement.Recovery percent of reserves unevenness, horizontal segment between by first pressure break multistage perforation, section
The cementing quality factors such as differ greatly influence, and horizontal well multiple fracturing technique difficulty is big, and targetedly technology is still in
The exploratory experiment stage.Horizontal well refracturing technique mainly includes two kinds both at home and abroad at present: the first is that mechanical packing repeats to press
Technique is split, its advantage is that sealing purpose well section using tubing string and packer card, is injected by oil pipe and realizes fixed point transformation, the disadvantage is that under
Enter the dragging operation of pipe string, it is more demanding to wellbore conditions, and managed column internal diameter influences, massive hydraulic fracture construction efficiency is (single time low
Tubing string is only constructed 1 section).Second is that dynamic multi-level temporarily blocks up refracturing technique, its advantage is that light casing operation, requires pit shaft
It is lower, turnaround fracture between infusing diverting agent realization section is pumped by well head, construction efficiency is high, the disadvantage is that transformation cannot be pinpointed, and multistage
Temporarily stifled boosting controllability is poor (the 1st grade of boosting amplitude > 5MPa, amplitude of boosting later are smaller), causes reservoir reconstruction presence not true
It is qualitative.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of open-hole horizontal well refracturing methods.It is provided by the invention
Open-hole horizontal well refracturing method can be realized fixed point transformation, and construction efficiency is high.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of open-hole horizontal well refracturing methods, comprising the following steps:
It is analysis parameter with regional structural geology feature, reservoir characteristic and single well controlled reserves, previous recovery percent of reserves, carries out
Refracturing Potentials select open-hole horizontal well；
Coiled tubing tubing string of the tripping in electric motor and drill bit in the existing base tube of the selected open-hole horizontal well bores
All ball seats are ground off, while recycling clast with aqueous fracturing fluid base fluid；
Coiled tubing tubing string of the tripping in gauguste cutter and scraper, In in the existing base tube of the selected open-hole horizontal well
Protocorm seat, which is set, to be iterated through three times, it is ensured that latus rectum is without deformation in base tube；
Tripping in takes the coiled tubing of down cup packer and nozzle in the existing base tube of the selected open-hole horizontal well
Tubing string, the nozzle are placed among two cup packers；
Nozzle location is directed at former first sliding sleeve position, the stifled slurry of squeezing is forced, arrives the corresponding open-hole horizontal well section, mistake
Amount replaces inside stifled slurry to former man-made fracture at 1 meter, termination of pumping 10 minutes, using the stifled peculiar residence characteristics of slurry, plays pump again and forces
Squeezing designs stifled slurry amount remainder, and is full of the net horizontal section oil jacket annulus, excessive to replace stifled slurry, not remain in base tube
Stifled slurry is principle；
It repeats the above steps, completes all sections of open-hole horizontal well section former man-made fractures and oil jacket annulus squeezing, then closing well
It waits the stifled slurry to be fully cured, the stifled slurry includes blocking agent and water, and the blocking agent includes calcium sulphoaluminate hyrate, gypsum, oxygen
Change calcium and magnesia；
Using aqueous fracturing fluid base fluid, whole examination is carried out to the selected full well section base tube of open-hole horizontal well with fracturing unit truck group
It presses, under 80MPa, pressure stabilizing 30 minutes, it was qualification that pressure drop, which is no more than 0.5MPa,；
It obtains to the complete horizontal well pit shaft of pressure break；
To described to the complete horizontal wellbore of pressure break, carry out conventional more shower pore volume pressure breaks, high density pattern perforation seam control volume
The multistage fracturing operation of pressure break, coiled tubing with spray gun underseal drag fracturing；
Mill drifting is bored to shaft bottom, together using coiled tubing band electric motor and drill bit to the gained complete horizontal wellbore of pressure break
When with aqueous fracturing fluid base fluid recycle bridge plug clast；
Pump infuses dedicated degradation agent, makes the complete aquation of stifled slurry having been cured in the complete horizontal well of the pressure break, realizes new, old pressure
Crack co-production.
Preferably, the reservoir characteristic includes survey well logging feature and structural depositional characters, reservoir are vertically and horizontally distributed, three-dimensional is answered
Power state, intrinsic fracture developmental state and dessert interbed distribution.
Preferably, the dessert interbed distribution includes reservoir "sweet spot" distribution characteristics and interlayer distribution characteristics.
Preferably, the single well controlled reserves include that hydrocarbon-bearing area, oil-gas Layer thickness, effecive porosity, crude oil are natural
Air tightness, hydrocarbon saturation and volume factor.
Preferably, horizontal well recoverable reserves is calculated according to Arps production decline method when the refracturing Potentials.
Preferably, reservoir engineering production split method analysis level well Remaining Oil And Gas is used when the refracturing Potentials
The regularity of distribution.
Preferably, the size distribution of the blocking agent is 8~2500 mesh, and density is 3.15~3.20g/cm3。
Preferably, the apparent viscosity of the stifled slurry is 25~85mPas, and fluidity is 17~27cm.
Preferably, the more shower pore volume pressure breaks of the routine, high density pattern perforation seam control volume fracturing, coiled tubing band spray gun
When the multistage fracturing operation of underseal drag fracturing, wellhead ground pressure is not higher than 90MPa.
Preferably, the degradation agent includes potassium permanganate or sodium peroxydisulfate.
The present invention provides a kind of open-hole horizontal well refracturing methods, comprising the following steps:
It is analysis parameter with regional structural geology feature, reservoir characteristic and single well controlled reserves, previous recovery percent of reserves, carries out
Refracturing Potentials select open-hole horizontal well；
Coiled tubing tubing string of the tripping in electric motor and drill bit in the existing base tube of the selected open-hole horizontal well bores
All ball seats are ground off, while recycling clast with aqueous fracturing fluid base fluid；
Coiled tubing tubing string of the tripping in gauguste cutter and scraper, In in the existing base tube of the selected open-hole horizontal well
Protocorm seat, which is set, to be iterated through three times, it is ensured that latus rectum is without deformation in base tube；
Tripping in takes the coiled tubing of down cup packer and nozzle in the existing base tube of the selected open-hole horizontal well
Tubing string, the nozzle are placed among two cup packers；
Nozzle location is directed at former first sliding sleeve position, the stifled slurry of squeezing is forced, arrives the corresponding open-hole horizontal well section, mistake
Amount replaces inside stifled slurry to former man-made fracture at 1 meter, termination of pumping 10 minutes, using the stifled peculiar residence characteristics of slurry, plays pump again and forces
Squeezing designs stifled slurry amount remainder, and is full of the net horizontal section oil jacket annulus, excessive to replace stifled slurry, not remain in base tube
Stifled slurry is principle；
It repeats the above steps, completes all sections of open-hole horizontal well section former man-made fractures and oil jacket annulus squeezing, then closing well
It waits the stifled slurry to be fully cured, the stifled slurry includes blocking agent and water, and the blocking agent includes calcium sulphoaluminate hyrate, gypsum, oxygen
Change calcium and magnesia；
Using aqueous fracturing fluid base fluid, whole examination is carried out to the selected full well section base tube of open-hole horizontal well with fracturing unit truck group
It presses, under 80MPa, pressure stabilizing 30 minutes, it was qualification that pressure drop, which is no more than 0.5MPa,；
It obtains to the complete horizontal well pit shaft of pressure break；
To described to the complete horizontal wellbore of pressure break, carry out conventional more shower pore volume pressure breaks, high density pattern perforation seam control volume
The multistage fracturing operation of pressure break, coiled tubing with spray gun underseal drag fracturing；
Mill drifting is bored to shaft bottom, together using coiled tubing band electric motor and drill bit to the gained complete horizontal wellbore of pressure break
When with aqueous fracturing fluid base fluid recycle bridge plug clast；
Pump infuses dedicated degradation agent, makes the complete aquation of stifled slurry having been cured in the complete horizontal well of the pressure break, realizes new, old pressure
Crack co-production.
Open-hole horizontal well refracturing method provided by the invention can be realized fixed point transformation, and construction efficiency is high, from one
Production capacity is excavated in the effective reservoir that secondary pressure break had not been developed；And blocking agent has grain composition, it can be on the stratum of many different physical property
In carry out closure use；Blocking agent has presence, and the chemical component there are many variable grain is contained in the stifled slurry that blocking agent is prepared, can be assisted
Same synergy is in plate flow pattern in formation pore, has good presence, can be resident, be not easy by ground in formation pore
Layer fluid erosion is fallen；Blocking agent is capable of forming inierpeneirating network structure, as long as there is the active force of 0.7MPa, it will be able to quickly (68s with
It is interior) form inierpeneirating network structure；Stifled slurry solidified body has micro-expansibility energy, the interaction of chemical constituent, especially one in blocking agent
A little inorganic particle ingredients, are capable of forming the biggish lattice of volume, so stifled slurry solidified body has the function of good microdilatancy, in this way
Very fine and close solidified body can be formed with stratum or steel body medium, be able to bear higher pressure；The plugging strength of blocking agent is high, can
To bear the pressure difference operation of 90MPa；The anti-triaxial stress ability of blocking agent is high, and after blocking agent solidification, it is very good that triaxial stress test is cashed,
Blocking agent Poisson's ratio (0.203) is significantly larger than cementing concrete (0.105), and elasticity modulus (4993.4) is far smaller than cementing concrete
(6180.2)；Blocking agent be fully achieved or more than under the elasticity modulus of high-quality water mud in middle Cementing cement standard in 5500
Index；The working security of blocking agent is high.
Detailed description of the invention
Fig. 1 is completion tubular column structural schematic diagram；
Fig. 2 is oil reservoir porosity plan view in the middle part of dessert；
Fig. 3 is oil reservoir oil saturation plan view in the middle part of dessert；
Fig. 4 is the pictorial diagram of the tripping in tail pipe column in the existing casing of selected open-hole horizontal well；
Fig. 5 is that stifled stock pump is infused to the pictorial diagram in open-hole horizontal well；
Fig. 6 is the inierpeneirating network structure schematic diagram that stifled slurry is formed；
Fig. 7 is the picture that the hydrated product of part amorphous has been dissoluted；
Fig. 8 is the picture of threadiness CSH gel；
Fig. 9 is self-healing schematic diagram；
Figure 10 is the temperature resistance test result of stifled slurry；
Figure 11 is the dilatancy result of stifled slurry；
Figure 12 is the salt-resistance test result of stifled slurry；
Figure 13 is the intensity map of blocking agent under certain oil field operating condition；
Figure 14 is to fracturing work pictorial diagram；
Figure 15 is the pictorial diagram that pump is infused degradation agent or waited long enough；
Figure 16 is slurried to block up, and tail pipe column is entered described in proposition, carries out new, old fractured layer position co-production pictorial diagram；
Figure 17 is the pictorial diagram that stifled slurry is uniformly taped against in crack caused by every shower hole.
Specific embodiment
The present invention provides a kind of open-hole horizontal well refracturing methods, comprising the following steps:
It is analysis parameter with regional structural geology feature, reservoir characteristic and single well controlled reserves, previous recovery percent of reserves, carries out
Refracturing Potentials select open-hole horizontal well；
Coiled tubing tubing string of the tripping in electric motor and drill bit in the existing base tube of the selected open-hole horizontal well bores
All ball seats are ground off, while recycling clast with aqueous fracturing fluid base fluid；
Coiled tubing tubing string of the tripping in gauguste cutter and scraper, In in the existing base tube of the selected open-hole horizontal well
Protocorm seat, which is set, to be iterated through three times, it is ensured that latus rectum is without deformation in base tube；
Tripping in takes the coiled tubing of down cup packer and nozzle in the existing base tube of the selected open-hole horizontal well
Tubing string, the nozzle are placed among two cup packers；
Nozzle location is directed at former first sliding sleeve position, the stifled slurry of squeezing is forced, arrives the corresponding open-hole horizontal well section, mistake
Amount replaces inside stifled slurry to former man-made fracture at 1 meter, termination of pumping 10 minutes, using the stifled peculiar residence characteristics of slurry, plays pump again and forces
Squeezing designs stifled slurry amount remainder, and is full of the net horizontal section oil jacket annulus, excessive to replace stifled slurry, not remain in base tube
Stifled slurry is principle；
It repeats the above steps, completes all sections of open-hole horizontal well section former man-made fractures and oil jacket annulus squeezing, then closing well
It waits the stifled slurry to be fully cured, the stifled slurry includes blocking agent and water, and the blocking agent includes calcium sulphoaluminate hyrate, gypsum, oxygen
Change calcium and magnesia；
Using aqueous fracturing fluid base fluid, whole examination is carried out to the selected full well section base tube of open-hole horizontal well with fracturing unit truck group
It presses, under 80MPa, pressure stabilizing 30 minutes, it was qualification that pressure drop, which is no more than 0.5MPa,；
It obtains to the complete horizontal well pit shaft of pressure break；
To described to the complete horizontal wellbore of pressure break, carry out conventional more shower pore volume pressure breaks, high density pattern perforation seam control volume
The multistage fracturing operation of pressure break, coiled tubing with spray gun underseal drag fracturing；
Mill drifting is bored to shaft bottom, together using coiled tubing band electric motor and drill bit to the gained complete horizontal wellbore of pressure break
When with aqueous fracturing fluid base fluid recycle bridge plug clast；
Pump infuses dedicated degradation agent, makes the complete aquation of stifled slurry having been cured in the complete horizontal well of the pressure break, realizes new, old pressure
Crack co-production.
To described to the complete horizontal wellbore of pressure break, carry out conventional more shower pore volume pressure breaks (speed is bored or solvable bridge plug), height
Density perforation seam control volume fracturing (speed is bored or solvable bridge plug), coiled tubing band spray gun underseal drag fracturing (annular space adds sand) etc. are more
Grade fracturing work；
Mill drifting is bored to shaft bottom, together using coiled tubing band electric motor and drill bit to the complete horizontal wellbore of pressure break
When with aqueous fracturing fluid base fluid recycle bridge plug clast (coiled tubing band spray gun underseal drag fracturing (annular space adds sand) except)；
The present invention is analysis ginseng with regional structural geology feature, reservoir characteristic and single well controlled reserves, previous recovery percent of reserves
Number carries out refracturing Potentials, selectes open-hole horizontal well.In the present invention, the existing base tube of the open-hole horizontal well
The following base pipe diameter of hanger is preferably >=41/2 ", i.e. four cun of half-covering tubes.In the present invention, the reservoir characteristic preferably includes to survey
Well logging feature and structural depositional characters, reservoir be vertically and horizontally distributed, three-dimensional stress constraint, intrinsic fracture developmental state and dessert interlayer
Distribution.
In the present invention, the dessert interbed distribution preferably includes reservoir "sweet spot" distribution characteristics and interlayer distribution characteristics.
In the present invention, the single well controlled reserves evaluation preferably includes hydrocarbon-bearing area, oil-gas Layer thickness, active porosity
Degree, crude oil natural gas density, hydrocarbon saturation and volume factor.
In the present invention, preferably calculating horizontal well according to Arps production decline method when the refracturing Potentials can adopt
Reserves.
In the present invention, reservoir engineering production split method is preferably used to analyze the water when refracturing Potentials
Horizontal well Remaining Oil Distribution.
After selected level well, present invention tripping in band electric motor and brill in the existing base tube of the selected open-hole horizontal well
The coiled tubing tubing string of head, brill grinds off all ball seats, while recycling clast with aqueous fracturing fluid base fluid.The present invention is under described
The concrete mode for entering the coiled tubing tubing string with electric motor and drill bit does not have special restriction, ripe using those skilled in the art
The mode known.
After selected level well, present invention tripping in band gauguste cutter and scraping in the existing base tube of the selected open-hole horizontal well
The coiled tubing tubing string of device, sets at protocorm seat and iterates through three times, it is ensured that latus rectum is without deformation in base tube.
After selected level well, present invention tripping in the existing base tube of the selected open-hole horizontal well takes down cup packing
The coiled tubing tubing string of device and nozzle, the nozzle are placed among two cup packers；By nozzle location alignment original first
Sliding sleeve position forces the stifled slurry of squeezing, arrives the corresponding open-hole horizontal well section, excessive to replace 1 inside stifled slurry to former man-made fracture
At rice, termination of pumping 10 minutes, using the stifled peculiar residence characteristics of slurry, pump is played again, squeezing is forced to design stifled slurry amount remainder, and filled
The full net horizontal section oil jacket annulus, it is excessive to replace stifled slurry, not remain stifled slurry in base tube as principle；
It repeats the above steps, completes all sections of open-hole horizontal well section former man-made fractures and oil jacket annulus squeezing, then closing well
It waits the stifled slurry to be fully cured, the stifled slurry includes blocking agent and water, and the blocking agent includes calcium sulphoaluminate hyrate, gypsum, oxygen
Change calcium and magnesia.In the present invention, the size distribution of the blocking agent is preferably 8~2500 mesh, and density is preferably 3.15~
3.20g/cm3。
In the present invention, the apparent viscosity of the stifled slurry is preferably 25~85mPas, and fluidity is preferably 17~27cm.
After stifled slurry is fully cured, the present invention uses aqueous fracturing fluid base fluid, horizontal to the selected naked eye with fracturing unit truck group
The full well section base tube of well carries out whole pressure testing, and under 80MPa, pressure stabilizing 30 minutes, it was qualification that pressure drop, which is no more than 0.5MPa,；It obtains to pressure break
Complete horizontal well pit shaft.
It obtains to the complete horizontal well pit shaft of pressure break, the present invention, to the complete horizontal wellbore of pressure break, carries out conventional more clusters to described
Perforation volume fracturing, the high density pattern perforation seam control multistage fracturing operation of volume fracturing, coiled tubing with spray gun underseal drag fracturing.
In the present invention, the more shower pore volume pressure breaks of the routine are preferably speed brill or solvable bridge plug；The high density pattern perforation seam control body
It overstocks and splits preferably speed brill or solvable bridge plug；The coiled tubing band spray gun underseal drag fracturing is preferably that annular space adds sand.
After the completion of multistage fracturing operation, the present invention uses the electronic horse of coiled tubing band to the gained complete horizontal wellbore of pressure break
It reaches and drill bit, brill mill drifting recycles bridge plug clast to shaft bottom, while with aqueous fracturing fluid base fluid.In the present invention, continuous oil
Pipe band spray gun underseal drag fracturing (annular space adds sand) does not need to bore mill drifting to well using coiled tubing band electric motor and drill bit
Bottom.
After brill has ground bridge plug, the present invention, which pumps, infuses dedicated degradation agent, makes the stifled slurry having been cured in the complete horizontal well of the pressure break
Complete aquation realizes new, old fracturing fracture co-production.In the present invention, the preferably described frac water of the complete aquation
The stifled pulp-water that 1m has been cured in oil jacket annulus and first fracturing fracture in horizontal well.
In the present invention, the degradation agent preferably includes potassium permanganate or sodium peroxydisulfate.Stock pump note is blocked up according to every 100 side
0.2 ton of degradation agent.
In order to further illustrate the present invention, below with reference to example to open-hole horizontal well refracturing method provided by the invention
It is described in detail, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
Pound sign: JHW019 well is other: evaluation well
Maximum hole angle: 90.63 °
Completion method: barefoot completion
Platform edges horizontal well, horizontal section length 1228.03m, vertical depth is in 3233-3292.7m
6 " horizontal segments are divided into 15 grades using open hole packer+complete well of pitching sliding sleeve
Dessert in LCG group, crack, which is owed, educates
Drilled wellbore trajectories:
The finishing drilling on April 21 in 2014 of JHW019 well, nuclear-magnetism are explained: horizontal section length 1228m, reservoir-encountered rate 61.8%
(759m), a kind of reservoir-encountered rate 19.5% (239m), second class reservoir Drilling ratio 15.8% (194m), Class Ⅲ reservoir Drilling ratio
26.6% (326m).Effecive porosity average value 9.2%, oil saturation average value 63.5%.
Completion tubular column structure is as shown in Figure 1, casing program is as shown in table 1.
1 casing program of table
Conventional logging:
Depth-logger is 3459-4815m, altogether explain interval 1356m, explain oil-yielding stratum 301.2m, difference oil reservoir 469.3m and
Oil-bearing layer 488.4m, other are dried layer.
Nuclear-magnetism is explained:
Classify according to nuclear magnetic resonance log porosity to reservoir.This well is explained altogether: a kind of reservoir thickness 302.3m, Quan Jing
3459-4815m, accounting 22.3%；Two class reservoirs: thickness 470m, accounting 34.7%；Three classes reservoir: thickness 488.5m, accounting
36%.Wherein I, II class reservoir Drilling ratio are 56.95%；I, II, III class reservoir Drilling ratio is 92.98%.With conventional logging knot
Fruit is close.
FRACTURE CHARACTERISTICS:
This well the crack well section 4050-4067m relatively develop, remaining well section crack owe educate, agensis.
Types of fractures with directly split seam, oblique seam etc. effectively seam based on, the visible corrosion hole of part interval.
Reservoir characteristic:
1) well logging situation
According to log data, the main Extra-fine sand rock of reservoir lithology, cloud consider sandstone to be worth doing, and wherein Extra-fine sand rock physical property is good, oiliness
It is good.
Logging explanation situation
LCG group: 46 layers of rock debris fluorescent, thickness 1395.00m；7 layers of gas logging abnormal, thickness 1342.00m, total hydrocarbon in gas logging are maximum
1.9001%, group is separated to nC5.1 layer of logging explanation, thickness 1395.00m, wherein 4 layers of oil reservoir, thickness 1060.00m, 3 layers of oil-bearing layer,
Thick 282.00m.
Lithology and oiliness: light gray, grey, Dark grey fluorescence mud stone, white clouds matter mud stone press from both sides grey matter mud stone, shale flour sand
Rock, white clouds matter siltstone, argillaceous dolomite.Wet photograph fluorescence 1-3%, dark yellow, weak light are done and shine fluorescence 1-2%, dark yellow,
Weak light, spray shine fluorescence 3-5%, yellow, in shine, series comparison 8-9 grades, milky white-milk yellow.
Drilling fluid situation: drilling fluid density 1.42-1.52g/cm when brill takes off this section3, viscosity 60-74s without significant change, out
Mouth conductivity 53.77-84.39mS/cm (conductivity variations are as caused by drilling fluid adjustment greatly).
Gas is surveyed: total hydrocarbon: 0.0316% ↑ 1.9001%, C1:0.0107% ↑ 1.1090%, group are separated to C5, are construed to oil
Layer, oil-bearing layer.
Physical property: (43-1) min/m (being influenced by directional drilling) when brill.
Logging explanation: logging explanation is oil reservoir.
2) deposition characteristics
Dessert body is Vlei phase, shore Vlei phase, shore lacustrine facies are pressed from both sides cloud mudflat and mutually deposited.
Dessert oil interbed distribution
1) oil-layer distribution feature
Class one zone dessert body oil reservoir span 35m, is divided into 3 substratums, and lithology is mainly that sand formation cuttings cloud rock, landwaste feldspar powder are thin
Sandstone and cloud consider sandstone to be worth doing.
Oil reservoir is concentrated, and lateral continuity is good, and overlapping thickness is greater than 10m, and main layer thickness is greater than 4m.
JHW019 well target zone is (landwaste feldspar powder packsand) oil reservoir in the middle part of dessert, and body region thickness is greater than 4m, with I
Based on class, lateral continuity is good.
Fig. 2 is oil reservoir porosity plan view in the middle part of dessert, and Fig. 3 is oil reservoir oil saturation plan view in the middle part of dessert.
Oil reservoir porosity average 11.7% in the middle part of dessert, oil saturation average 67%, physical property, oiliness are good.
2) dessert interlayer distribution characteristics
3 interlayers of dessert major developmental, two 0~1.6m of compartment thickness on oil reservoir, it is limited to separate ability in the middle part of dessert.
Lower part 4.8~6.2m of interlayer.
Three tensile strength 13.9MPa of interlayer, horizontal minimum principal stress are 50.1MPa, fracture pressure 64MPa；
Two tensile strength 12.5MPa of interlayer, horizontal minimum principal stress are 49.8MPa, fracture pressure 62.3MPa；
Interlayer and target zone fracture pressure difference are 1.1~2.8MPa, and lower part interlayer thickness 5m or so, crack easily extends up.
Table 2 is that target block layer position rupture strength and crustal stress compare.
2 target block layer position rupture strength of table and crustal stress comparison
The estimation of JHW019 well single well controlled reserves:
1) oil area
Foundation: horizontal section length 1228m, width take 300m (well spacing 300m), then oil area is 0.3684km2。
2) core intersection
According to the core intersection figure that early period completes, value 4.5m.
3) effecive porosity
It takes JHW019 well to bore and meets oil reservoir, poor core intersection weighted average, be 0.11, with former reserves parameter I class+II class
Porosity value is all 0.11.
4) oil density
Crude oil analysis data after being gone into operation according in December, 2014, value 0.879.
5) oil saturation
The reserves parameter for taking original a kind of reservoir, is 0.673.
6) volume factor
The reserves parameter for taking original a kind of reservoir, is 1.06.
Table 3 is that JHW019 well single well controlled reserves estimate table.
Table 3JHW019 well single well controlled reserves estimate table
| Area | Thickness | Porosity | Saturation degree | Density | Volume factor | Stock number |
| km2 | m | f | f | g/cm3 | f | 104t |
| 0.3684 | 5.5 | 0.11 | 0.673 | 0.879 | 1.06 | 12.4 |
Refracturing Potentials:
This well recoverable reserves 18905t is calculated according to Arps production decline method, accumulative at present to recover the oil 8633 tons, recovery percent of reserves
45.66%, residual recoverable reserves 10272t have refracturing and exploit potentialities.
Potentials: this well Remaining Oil Distribution is analyzed using reservoir engineering production split method.By analysis, one, two
Although class oil reservoir produced quantity is more, due to initial reserves height, remaining oil is opposite to be enriched with, and is still that multiple pressure is taped the latent power emphasis.Conclusion: one,
Two class reservoirs are refracturing reforming key points.
Selected 51~120 DEG C of open-hole horizontal well bottom hole temperature (BHT) range.
Old well existing level section base tube model 41/2 ".
The tripping in coiled tubing in the existing base tube of selected open-hole horizontal well, pictorial diagram are as shown in Figure 4.
In the stifled slurry to the open-hole horizontal well of pump note, replace and full of it is described enter the first fracturing fracture 1m of section in and oil jacket ring
Then sky solidifies the stifled slurry, the stifled slurry includes stifled slurry and water, the blocking agent include calcium sulphoaluminate hyrate, gypsum, oxidation
Calcium and magnesia are obtained to pressure break horizontal well, and pictorial diagram is as shown in Figure 5；
Blocking agent is product made of a variety of multifunctional material retrofits, grain composition compounding.
Appearance: grey-brown powder
Size distribution: 8-2500 mesh
Density: 3.15-3.20g/cm3
Formulated fluids: similar with cement slurry；
Prepare density: 1.45-2.60g/cm3
Apparent viscosity: 25-85mPas；
Fluidity: 17-27cm
Thickening time: any adjustable
Drillability: consolidation object drillability is fine
Blocking agent blocks mechanism
1, inierpeneirating network structure is formed
Blocking agent and water are configured to certain density stifled slurry, enter drop ply (when leak source) in stifled slurry and (are greater than under differential pressure action
0.7MPa), component synergy in slurry is blocked up, is chemically reacted, at this moment, stifled slurry will soon form inierpeneirating network structure, shape
At special fluidised form, the other components in slurry are blocked up, can be filled among the gap in closely knit network structure, blocking up slurry just has resistance to punching
Brush ability just has resident performance.
Hydrated product CSH coagulates in various flexible fibers, rigid fiber, stifled slurry in the mainly stifled slurry of inierpeneirating network structure
The substances such as glue and the crystal of much chemical reaction productions wind mutually, are coupled into an overall structure.Stifled slurry is in block section
(layer), which does not return, to be spat, and stifled slurry does not generate slurry band.
Fig. 6 is the inierpeneirating network structure schematic diagram that stifled slurry is formed.
2, expansion
Calcium sulphoaluminate hyrate and gypsum, which react, generates entringite, and product lattice occupies more than the lattice of former compound
Big space generates apparent bulking effect, can cause the increase of volume.
The expansion of calcium oxide and magnesia is: calcium oxide and magnesia generate calcium hydroxide and magnesium hydroxide, crystalline form
It changes, volume increases, and microdilatancy occurs.
The open expansion rate of blocking agent is 1.8~4.5%.
It is 0.3-0.8% that API, which solidifies volume expansivity,.
3, self-healing
Blocking agent is under dynamic curing conditions, and crystallization is intact rodlike ettringite on blocking agent surface, in entringite
Below crystal, it is seen that the hydrated product of part amorphous has been dissoluted (Fig. 7), exposes fresh surface, raw on this fresh surface
At a large amount of threadiness CSH gels, belongs to CSH (II) type (Fig. 8) that Diamond is defined, be the product at aquation initial stage.Fig. 9 is
Self-healing schematic diagram, these blocking agent solidified body cementation interfaces can be continuously generated many erosion resistant hydrated products, eliminate
Harmful intermediate zone at interface, the ability for making interface have very strong anti-high-pressure fluid erosion, here it is the self-healings of blocking agent interface
Effect, this effect fundamentally improve closure quality, improve interface cementing strength, extend continuing for boundary strength
Property.
Presence
After blocking agent enters plugged zone, inierpeneirating network structure can be quickly formed, is effectively trapped in by special mechanism
In plugged zone, does not return and spit.When field application, the thickening time of stifled slurry can be adjusted according to site specific, it is existing to meet
The requirement of field safe construction.
Triaxial stress analyzes (toughness)
140 DEG C of circulating temperature basic Behavior of Hardened Cement Paste, blocking agent solidified body triaxial stress test result are as shown in table 4.
4 triaxial stress of table analyzes result
Stifled to starch Poisson's ratio with higher and lower elastic mould value, i.e., there is stifled slurry solidified body good anti-three-dimensional to answer
The effect of power, it is, can satisfy the requirement of modern cementing technology.Middle Cementing cement slurry standard requirements elasticity modulus is small
In 5500, for qualified mortar architecture.
Test results are shown in figure 10 for temperature resistance, and Figure 11 is dilatancy as a result, Figure 12 is salt-resistance test result, and table 5 is
Rheological characteristic test result.
5 rheological characteristic test result of table
The intensity of blocking agent is as shown in figure 13 under XX oil field operating condition, available from figure: the water at 95 DEG C, in blocking agent
Change reaction persistently to carry out in 120 days；At 150 DEG C, the hydration reaction in blocking agent persistently carries out in 60 days, and 150 DEG C are supported
The blocking agent cured body strength of shield is higher than the blocking agent intensity of 95 DEG C of maintenances.And ordinary cement slurry then reached stable at 100 hours or so
State.
Carry out multistage fracturing operation to pressure break horizontal well to described, pictorial diagram is as shown in figure 14；
Pump note degradation agent, pictorial diagram is as shown in figure 15, makes the complete water of stifled slurry to have been cured in pressure break horizontal well
Change, realize new, old fracturing fracture co-production, pictorial diagram is as shown in figure 16.
Figure 17 is the pictorial diagram that stifled slurry is uniformly taped against in crack caused by every shower hole.
Technology point
Closure+perforations adding pressure break is taken to seek production. art
1, lower oil pipe 1000m, then descend coiled tubing to artificial bottom of a well；
2, coiled tubing is then dragged to shaft bottom for stifled slurry；While for while drag, also want annular space control ring press 10-15MPa；
3, coiled tubing is dragged to home, just presses well liquid；
4, stifled slurry is squeezed into first fracturing fracture section by closing well, forward extrusion well liquid；
5, after waiting pressure diffusion, act coiled tubing；
6, build the pressure closing well Hou Ning；
7, mill drifting, pressure testing 80MPa are bored；
8, the multistage new interval of perforations adding pressure break, bores plug after pressure, note degradation agent aquation has consolidated stifled slurry, and new, old crack is asked jointly
It produces.
It is oily to obtain daily output 55t, aqueous 12.5%.
1, blocking agent has grain composition
Blocking agent has the various chemical particle gradations of 8-2500 mesh, enable in this way blocking agent in the stratum of many different physical property into
Row, which blocks, to be used；Behavior of Hardened Cement Paste only has a kind of silicate granularity, without grain composition；The blocking agent use scope that the present invention uses is more
Extensively.
2, blocking agent has presence
Contain the chemical component there are many variable grain in the stifled slurry that blocking agent is prepared, can be synergistic, in formation pore
In plate flow pattern, there is good presence, can be resident in formation pore, is not easy to be fallen by formation fluid erosion；Cement slurry
It is in spike type flow pattern (fingering phenomenon) in formation pore, without presence, easily by formation fluid erosion；After blocking agent enters stratum
It does not return and spits, cement slurry, which returns, spits phenomenon.
3, blocking agent is capable of forming inierpeneirating network structure
It is stifled to starch in the earth formation, as long as there is the active force of 0.7MPa, it will be able to interpenetrating networks knot is quickly formed (within 68s)
Structure, at this point, just there is certain pressure-bearing (6-8MPa) ability, which improves the plugging effects of blocking agent；Cement slurry is only thick
Inierpeneirating network structure could be formed when changing (after general 240min), was easy before forming structure by formation fluid dilution, punching
Erosion, plugging effect is with regard to poor；The success that blocking agent blocks is just more much higher than cement slurry.
4, blocking up slurry solidified body has micro-expansibility energy
The interaction of chemical constituent in blocking agent, especially some inorganic particle ingredients, is capable of forming the biggish crystalline substance of volume
Lattice can be formed very fine and close so stifled slurry solidified body has the function of good microdilatancy with stratum or steel body medium in this way
Solidified body has the function that be able to bear higher pressure；The solidified body of cement slurry is micro- contraction, is formed between surrounding medium
Microcrack is easy to be destroyed by strata pressure, Micro blazed-grating occurs, even adding expansile component in cement slurry, still, can drop
The integral strength of low Hydrofracture Grout Incorporating Intermediate Level Radioactive Waste Liquid；Validity period after blocking agent blocks is longer.
5, the plugging strength of blocking agent is high
Blocking agent solidified body plugging strength is very high, and field application can bear the pressure break effect of 75MPa at present；And cement slurry
As long as it is qualification that solidified body API compression strength, which is greater than 14MPa, plugging strength is relatively shorter than blocking agent；Blocking agent can expire after blocking
The needs of foot sky casing fracturing.
6, the anti-triaxial stress ability of blocking agent is high
After blocking agent solidification, it is very good that triaxial stress test is cashed, and blocking agent Poisson's ratio (0.203) is significantly larger than cementing concrete
(0.105), and elasticity modulus (4993.4) is far smaller than cementing concrete (6180.2)；Blocking agent is fully achieved or is more than that middle petroleum is solid
Index in well cement standard under the elasticity modulus of high-quality water mud in 5500；Blocking agent can be completely used for the need of payzone well cementation
It wants.
7, the working security of blocking agent is high
The interaction of heatproof, salt resistance component in blocking agent, when scene uses very " mild ", the thickening time is arbitrarily controlled
System, has good compatibility effect with the water flooding of salinity in stratum, has good salt resistance temperature resistance ability, is not in " to dodge
It is solidifying ", " coacervation " phenomenon, there are no any down-hole accident occur from more than 1400 mouth wells of construction；Cement slurry at the scene in use,
It is easy the pollution by stratum salinity water flooding, is easy to appear " dodging solidifying ", " coacervation " phenomenon, leads to " plant flag bar ", " fill fragrant
The down-hole accident of intestines " complexity；Blocking agent working security is very high.
The above is only a preferred embodiment of the present invention, it is not intended to limit the present invention in any form.It should
It points out, for those skilled in the art, without departing from the principle of the present invention, if can also make
Dry improvements and modifications, these modifications and embellishments should also be considered as the scope of protection of the present invention.
Claims (10)
1. a kind of open-hole horizontal well refracturing method, which comprises the following steps:
It is analysis parameter with regional structural geology feature, reservoir characteristic and single well controlled reserves, previous recovery percent of reserves, is repeated
Fracturing potential analysis, selectes open-hole horizontal well；
Coiled tubing tubing string of the tripping in electric motor and drill bit, brill are ground off in the existing base tube of the selected open-hole horizontal well
All ball seats, while clast is recycled with aqueous fracturing fluid base fluid；
Coiled tubing tubing string of the tripping in gauguste cutter and scraper in the existing base tube of the selected open-hole horizontal well, in protocorm
Seat, which is set, to be iterated through three times, it is ensured that latus rectum is without deformation in base tube；
Tripping in takes the coiled tubing tubing string of down cup packer and nozzle in the existing base tube of the selected open-hole horizontal well,
The nozzle is placed among two cup packers；
Nozzle location is directed at former first sliding sleeve position, the stifled slurry of squeezing is forced, arrives the corresponding open-hole horizontal well section, it is excessive to push up
At 1 meter inside stifled slurry to former man-made fracture, termination of pumping 10 minutes, using the stifled peculiar residence characteristics of slurry, pump is played again and forces squeezing
Stifled slurry amount remainder is designed, and is full of the net horizontal section oil jacket annulus, it is excessive to replace stifled slurry, stifled slurry is not remained in base tube
For principle；
It repeats the above steps, completes all sections of open-hole horizontal well section former man-made fractures and oil jacket annulus squeezing, then closing well waits
The stifled slurry is fully cured, and the stifled slurry includes blocking agent and water, and the blocking agent includes calcium sulphoaluminate hyrate, gypsum, calcium oxide
And magnesia；
Using aqueous fracturing fluid base fluid, whole pressure testing is carried out to the selected full well section base tube of open-hole horizontal well with fracturing unit truck group,
Under 80MPa, pressure stabilizing 30 minutes, it was qualification that pressure drop, which is no more than 0.5MPa,；
It obtains to the complete horizontal well pit shaft of pressure break；
To described to the complete horizontal wellbore of pressure break, carry out conventional more shower pore volume pressure breaks, high density pattern perforation seam control volume fracturing,
Multistage fracturing operation of the coiled tubing with spray gun underseal drag fracturing；
Is bored by mill drifting to shaft bottom, is used simultaneously using coiled tubing band electric motor and drill bit for the gained complete horizontal wellbore of pressure break
Aqueous fracturing fluid base fluid recycles bridge plug clast；
Pump infuses dedicated degradation agent, makes the complete aquation of stifled slurry having been cured in the complete horizontal well of the pressure break, realizes that new, old pressure break is split
Stitch co-production.
2. open-hole horizontal well refracturing method according to claim 1, which is characterized in that the reservoir characteristic includes surveying
Well logging feature and structural depositional characters, reservoir are vertically and horizontally distributed, three-dimensional stress constraint, intrinsic fracture developmental state and dessert press from both sides
Layer distribution.
3. open-hole horizontal well refracturing method according to claim 2, which is characterized in that the dessert interbed distribution packet
Include reservoir "sweet spot" distribution characteristics and interlayer distribution characteristics.
4. open-hole horizontal well refracturing method according to claim 1, which is characterized in that the single well controlled reserves packet
Include hydrocarbon-bearing area, oil-gas Layer thickness, effecive porosity, crude oil natural gas density, hydrocarbon saturation and volume factor.
5. open-hole horizontal well refracturing method according to claim 1, which is characterized in that the refracturing potentiality point
Horizontal well recoverable reserves is calculated according to Arps production decline method when analysis.
6. open-hole horizontal well refracturing method according to claim 1 or 5, which is characterized in that the refracturing is latent
The reservoir engineering production split method analysis level well Remaining Oil And Gas regularity of distribution is used when power is analyzed.
7. open-hole horizontal well refracturing method according to claim 1, which is characterized in that the size distribution of the blocking agent
For 8~2500 mesh, density is 3.15~3.20g/cm3。
8. open-hole horizontal well refracturing method according to claim 1 or claim 7, which is characterized in that the stifled slurry it is apparent
Viscosity is 25~85mPas, and fluidity is 17~27cm.
9. open-hole horizontal well refracturing method according to claim 1, which is characterized in that the more shower hole bodies of routine
Overstock split, high density pattern perforation seam control volume fracturing, multistage fracturing operation of the coiled tubing with spray gun underseal drag fracturing when, well head
Geostatic pressure is not higher than 90MPa.
10. open-hole horizontal well refracturing method according to claim 1, which is characterized in that the degradation agent includes height
Potassium manganate or sodium peroxydisulfate.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111255428A (en) * | 2020-03-09 | 2020-06-09 | 四川洁能锐思石油技术有限公司 | Casing horizontal well shaft reconstruction repeated fracturing method |
| CN111287722A (en) * | 2020-03-05 | 2020-06-16 | 四川瑞都石油工程技术服务有限公司 | Method for repeated fracturing of horizontal well after drilling and grinding of open hole packer completion |
| CN112267863A (en) * | 2020-09-21 | 2021-01-26 | 中石油煤层气有限责任公司 | Temporary plugging and re-fracturing method for coal-bed gas well cracks |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4750562A (en) * | 1985-08-30 | 1988-06-14 | Mobil Oil Corporation | Method to divert fractures induced by high impulse fracturing |
| CN103352683A (en) * | 2005-12-05 | 2013-10-16 | 普拉德研究及开发股份有限公司 | Method of formation protection while performing downhole operation |
| CN103422834A (en) * | 2013-07-15 | 2013-12-04 | 中国石油天然气股份有限公司 | Oil well blocking agent and application thereof |
| CN104119847A (en) * | 2014-08-05 | 2014-10-29 | 中国石油大学(华东) | Acid-soluble composite plugging agent and application thereof |
| CN105275442A (en) * | 2015-10-29 | 2016-01-27 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Old well re-transformation volume fracturing technology |
| CN105507865A (en) * | 2014-09-22 | 2016-04-20 | 中国石油化工股份有限公司 | Re-fracturing method for oil, gas and water wells |
| CN106351634A (en) * | 2015-07-16 | 2017-01-25 | 中国石油化工股份有限公司 | Casing horizontal well multi-segment refracturing method |
| CN107090282A (en) * | 2017-05-18 | 2017-08-25 | 北京世纪中星能源技术有限公司 | A kind of mixed type diverting agent and its diverting agent mixture, temporary blocking method and application |
| CN108240210A (en) * | 2016-12-27 | 2018-07-03 | 中国石油天然气股份有限公司 | A kind of refracturing method |
| CN109763804A (en) * | 2018-12-28 | 2019-05-17 | 北京大学 | A kind of horizontal well in segments temporarily blocks up fracturing process |
| CN109973067A (en) * | 2019-03-04 | 2019-07-05 | 中国石油天然气股份有限公司 | Horizontal well crack blocks pit shaft and reproduces refracturing method |
-
2019
- 2019-09-20 CN CN201910891487.XA patent/CN110529089B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4750562A (en) * | 1985-08-30 | 1988-06-14 | Mobil Oil Corporation | Method to divert fractures induced by high impulse fracturing |
| CN103352683A (en) * | 2005-12-05 | 2013-10-16 | 普拉德研究及开发股份有限公司 | Method of formation protection while performing downhole operation |
| CN103422834A (en) * | 2013-07-15 | 2013-12-04 | 中国石油天然气股份有限公司 | Oil well blocking agent and application thereof |
| CN104119847A (en) * | 2014-08-05 | 2014-10-29 | 中国石油大学(华东) | Acid-soluble composite plugging agent and application thereof |
| CN105507865A (en) * | 2014-09-22 | 2016-04-20 | 中国石油化工股份有限公司 | Re-fracturing method for oil, gas and water wells |
| CN106351634A (en) * | 2015-07-16 | 2017-01-25 | 中国石油化工股份有限公司 | Casing horizontal well multi-segment refracturing method |
| CN105275442A (en) * | 2015-10-29 | 2016-01-27 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Old well re-transformation volume fracturing technology |
| CN108240210A (en) * | 2016-12-27 | 2018-07-03 | 中国石油天然气股份有限公司 | A kind of refracturing method |
| CN107090282A (en) * | 2017-05-18 | 2017-08-25 | 北京世纪中星能源技术有限公司 | A kind of mixed type diverting agent and its diverting agent mixture, temporary blocking method and application |
| CN109763804A (en) * | 2018-12-28 | 2019-05-17 | 北京大学 | A kind of horizontal well in segments temporarily blocks up fracturing process |
| CN109973067A (en) * | 2019-03-04 | 2019-07-05 | 中国石油天然气股份有限公司 | Horizontal well crack blocks pit shaft and reproduces refracturing method |
Non-Patent Citations (2)
| Title |
|---|
| 李锐等: "重复压裂用转向剂的研究及应用进展", 《广州化工》 * |
| 薛世杰等: "一种复合暂堵剂在重复压裂中的应用", 《钻采工艺》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111287722A (en) * | 2020-03-05 | 2020-06-16 | 四川瑞都石油工程技术服务有限公司 | Method for repeated fracturing of horizontal well after drilling and grinding of open hole packer completion |
| CN111255428A (en) * | 2020-03-09 | 2020-06-09 | 四川洁能锐思石油技术有限公司 | Casing horizontal well shaft reconstruction repeated fracturing method |
| CN112267863A (en) * | 2020-09-21 | 2021-01-26 | 中石油煤层气有限责任公司 | Temporary plugging and re-fracturing method for coal-bed gas well cracks |
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