CN104727800B - A kind of temporary stall based on the modified vinal in surface is to fracturing process - Google Patents
A kind of temporary stall based on the modified vinal in surface is to fracturing process Download PDFInfo
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Abstract
The present invention specifically provides a kind of temporary stall based on the modified vinal in surface to fracturing process, comprises the following steps：1) surface modified aqueous vinal；2) preparation of fracturing working fluid；3) using active water for extrusion well liquid within the cartridge；4) setting fracture packer；5) prepad fluid is injected, major fracture is formed；6) the major fracture staged to formation injects water-soluble biodegradable fiber temporarily stifled fracturing fluid, and injection stratum forms new branch's seam；7) to the new branch seam injection prepad fluid of formation, seam length is expanded；8) to the new branch seam staged injection load fluid of formation；9) with active water for load fluid in extrusion pit shaft.The invention is by the way that sand packed fracture is temporarily blocked up by old crack or, with making new seam on primary fracture at an angle direction, link up more intrinsic fractures and region is not employed in first crack, form new crack aerial drainage system, oil and gas production and oil gas field ultimate recovery are improved, the problem recovered old well production and realize new well fracturing yield increasing is solved.
Description
Technical field
The invention belongs to In Oil Field Exploration And Development underground work technical field, and in particular to one kind is based on the modified poly- second in surface
The temporary stall of enol fiber improves recovery ratio to fracturing process for Low permeable oil and gas reservoirs.
Background technology
Long celebrating oil gas field has typical low pressure, hypotonic, low yield feature.With going deep into for exploitation, a class of early stage pressure break
The hydraulic fracture of reservoir has failed or produced blocking, and the permeance property of primary fracture substantially reduces even ineffective.Together
When, due to early stage fracturing reform scale not enough, either supporting crack is short or fracture condudtiviy is low, and this kind of well must be increased
Pressure break scale continues to extend primary fracture, or puies forward high sand ratio/sand amount to increase fracture condudtiviy, could improve the production of well
Energy.
In addition, after prolonged exploitation, the crude oil that early stage fracturing fracture is controlled has been adopted to the greatest extent substantially, remote slit band
Crude oil can not supplement in time, and prolonged water flooding recovery causes water filling forward position to be promoted to producing well, some old cracks into
For the main thoroughfare of water, this largely have impact on production well yield.
Furthermore, for Chan Jian areas, under certain condition, new well, which implements turnaround fracture, can produce many cracks, so as to increase day
Right air infiltration flow area, improves gas output per well；But, conventional turnaround fracture technology has that reservoir reconstruction degree is low, and measure is effective
Phase is short, and granular pattern diverting agent is big to reservoir damage, the problems such as degrading not thorough.
The content of the invention
The purpose of the present invention be overcome the old crack oil and gas of early stage pressure break to yield poorly, recovery ratio it is low, and conventional turnaround fracture
Technology has that reservoir reconstruction degree is low, and the measure term of validity is short, and granular pattern diverting agent is big to reservoir damage, degrades not thorough etc. and to ask
Topic.
Therefore, the invention provides a kind of temporary stall based on the modified vinal in surface to fracturing process, wrapping
Include following steps：
1) surface modification is carried out to water-soluble polyvinyl alcohol fibers, obtains modified vinal；
2) preparation of fracturing working fluid；Preparing mass fraction, your glue crosslinked fluid makees prepad fluid for 0.3% guanidine, and proppant is accounted for
The volume fraction of your glue crosslinked fluid of guanidine is 15%~30%, and the mass fraction that modified vinal accounts for proppant is 1.2%
~1.8%；
3) using active water with 0.4~0.5m3/ min operational discharge capacity is for the liquid in extrusion pit shaft；
4) after the liquid in pit shaft is drained, with 0.6~2.0m3/ min operational discharge capacity setting fracture packer；
5) after fracturing packer is set, with 2.4~3.0m3/ min operational discharge capacity injection prepad fluid 45m3, form master and split
Seam；
6) the major fracture staged to formation injects the load fluid of guanidine that glue crosslinked fluid and proppant composition, and staged adds sand
Specific concentration is followed successively by 10%-15%-20%-28%-30%, is to add in the 10%-15%-20%-28% stages to be not added with being modified in sand proportion concentration
The load fluid of vinal afterwards, starts to be mixed into step 2 in sand proportion concentration is the load fluid in 30% stage) middle preparation
The mass fraction for accounting for proppant be 1.2%~1.8% modified vinal, injection stratum forms new branch seam；
7) to the new branch seam injection 27m of formation3Prepad fluid, expand seam length；
8) load fluid constituted to new branch seam staged injection guanidine your glue crosslinked fluid and the proppant of formation, sand proportion is dense
Degree is followed successively by 10%-15%-20%-25%-30%；
9) with 2.4~3.0m3/ min operational discharge capacity is with active water for the load fluid in extrusion pit shaft.
The step 1) in using chromic acid solution to water-soluble polyvinyl alcohol fibers carry out surface modification.
The step 1) in use KMnO4/ sulfuric acid carries out grafted propylene as initiator to water-soluble polyvinyl alcohol fibers
Acid is modified.
The step 1) in using methacryloxypropyl trimethoxy silane water/ethanol solution to water-soluble
Property vinal carry out surface modification.
The step 2) in select modified vinal length be 6~8mm.
The step 2) in select a diameter of 10 μm of modified vinal.
The modified vinal is 1.2% relative to the mass fraction of proppant.
The volume fraction that the proppant accounts for fracturing working fluid is 30%.
The step 3) in active water operational discharge capacity be 0.4m3/min。
The step 5) in prepad fluid operational discharge capacity be 2.4m3/min。
Beneficial effects of the present invention：This temporary stall based on the modified vinal in surface that the present invention is provided to
The technology that water-soluble biodegradable fiber is combined into by fracturing process with conventional pressure break, it is proposed that modified by surface
You form interim slug by the working solution of glue+proppant composition to water-soluble polyvinyl alcohol fibers+guanidine in old crack, produce necessarily
Net-head, the pressure difference presses off new crack this layer of position, forms many cracks system, expands drainage area；Crack is acted on after pressure break
The effect time increases, and effect is more preferable；Technical process is simple and easy to apply, and cost is relatively low, can increase substantially oil field productivity effect.
The present invention is described in further details below with reference to accompanying drawing.
Brief description of the drawings
Fig. 1 is the blocking grid signal that modified water-soluble polyvinyl alcohol fibers in the present invention are formed in proppant
Figure.
Fig. 2 is that modified water-soluble polyvinyl alcohol fibers in the present invention temporarily block up refracturing and form new branch's seam signal
Figure.
Embodiment
Embodiment 1：
Yield poorly for the old crack oil and gas for overcoming early stage pressure break, recovery ratio it is low, and there is storage in conventional turnaround fracture technology
Layer transformation degree is low, and the measure term of validity is short, and granular pattern diverting agent is big to reservoir damage, the problems such as degrading not thorough, the present embodiment
There is provided a kind of temporary stall based on the modified vinal in surface as depicted in figs. 1 and 2 to fracturing process, including such as
Lower step：
1) surface modification is carried out to water-soluble polyvinyl alcohol fibers, obtains modified vinal；
2) preparation of fracturing working fluid；Preparing mass fraction, your glue crosslinked fluid makees prepad fluid for 0.3% guanidine, and proppant is accounted for
The volume fraction of your glue crosslinked fluid of guanidine is 15%~30%, and the mass fraction that modified vinal accounts for proppant is 1.2%
~1.8%；
3) using active water with 0.4~0.5m3/ min operational discharge capacity is for the liquid in extrusion pit shaft；
4) after the liquid in pit shaft is drained, with 0.6~2.0m3/ min operational discharge capacity setting fracture packer；
5) after fracturing packer is set, with 2.4~3.0m3/ min operational discharge capacity injection prepad fluid 45m3, form master and split
Seam；
6) the major fracture staged to formation injects the load fluid of guanidine that glue crosslinked fluid and proppant composition, and staged adds sand
Specific concentration is followed successively by 10%-15%-20%-28%-30%, is to add in the 10%-15%-20%-28% stages to be not added with being modified in sand proportion concentration
The load fluid of vinal afterwards, starts to be mixed into step 2 in sand proportion concentration is the load fluid in 30% stage) middle preparation
The mass fraction for accounting for proppant be 1.2%~1.8% modified vinal, injection stratum forms new branch seam；
7) to the new branch seam injection 27m of formation3Prepad fluid, expand seam length；
8) load fluid constituted to new branch seam staged injection guanidine your glue crosslinked fluid and the proppant of formation, sand proportion is dense
Degree is followed successively by 10%-15%-20%-25%-30%；
9) with 2.4~3.0m3/ min operational discharge capacity is with active water for the load fluid in extrusion pit shaft.
Step 6) in modified vinal by the way that Full-automatic fiber is scattered, metering and adding apparatus are added, it is real
Existing fiber addition is efficiently connected with measuring truck, fracturing blender truck, quantified controlling.
This temporary stall based on the modified vinal in surface that the invention is provided is to fracturing process by water solubility
The technology that biodegradable fiber is combined into conventional pressure break, it is proposed that pass through the modified water-soluble polyvinyl alcohol fiber in surface
You form interim slug by the working solution of glue+proppant composition to dimension+guanidine in old crack, produce certain net-head, the pressure difference exists
This layer of position presses off new crack, forms many cracks system, expands drainage area；The crack action effect time increases after pressure break, effect
Fruit is more preferably；Technical process is simple and easy to apply, and cost is relatively low, can increase substantially oil field productivity effect.
Embodiment 2：
On the basis of embodiment 1, the step 1) in water-soluble polyvinyl alcohol fibers can be entered using chromic acid solution
Row surface is modified, and the formula of chromic acid solution is K2Cr2O7、H2O and dense H2SO4Amount of substance ratio is 5：8：100, by water-soluble polyethylene
Alcohol fiber soaks 2.5h under the chromic acid solution chromic acid solution room temperature condition.
The step 1) in can also use KMnO4/ sulfuric acid connects as initiator to water-soluble polyvinyl alcohol fibers
Acrylic acid modified, the KMnO of branch4Concentration is 5 × 10-3Mol/L, sulfuric acid concentration be 0.2mol/L, acrylic acid concentration be 0.8mol/L,
Reaction time is 3.0h.
The step 1) in can also using methacryloxypropyl trimethoxy silane water/ethanol solution to water
Soluble polyvinyl alcohol fiber carries out surface modification, and concentration is 25 × 10-3Mol/L cumyl peroxide makees initiator, methyl
Acryloxypropyl trimethoxy silane monomer concentration is 0.1mol/L, by water-soluble polyvinyl alcohol fibers in the metering system
Dip time 24 hours, concentration of alcohol 10% in water/ethanol solution of acryloxypropylethoxysilane trimethoxy silane.
Above-mentioned three kinds are carried out to water-soluble polyvinyl alcohol fibers in the method for surface modification, water-soluble polyvinyl alcohol fibers table
Methacryloxypropyl trimethoxy silane molecule has been adsorbed in face, and hydroscopicity highest reaches 0.41%.
It is preferred that the water-soluble polyvinyl alcohol fibers used in during temporarily stifled refracturing is constructed, from methacryloxypropyl
Water/ethanol solution of trimethoxy silane carries out surface modification to water-soluble polyvinyl alcohol fibers, obtains modified polyethylene
Alcohol fiber, this process for modifying surface improves water-soluble polyvinyl alcohol fibers and the uniform mixing velocity more than 30% of fracturing fluid, point
The degree of dissipating is good, and without phenomenon of substantially uniting, 10d degradable more than 85%, effectively reduces proppant settlement rate within 90 DEG C
More than 50%, modified water-soluble polyvinyl alcohol fibers network of fibers and proppant formation complex, its stabilization time improve
1~2 times, proppant backflow amount reduction by more than 80%.
Embodiment 3：
On the basis of embodiment 1 and embodiment 2, design fiber temporarily block up displacement test, preferably go out the step 2) in change
Property after vinal length be 6~8mm.
The process that fiber temporarily blocks up displacement test is as follows：1. it is uniform the two of rectangle by being axially cut into section from centre by rock core
Half；2. the proppant for being mixed with the modified vinal of different length uniformly is spread in two semi-synthetic gaps, by it
It is fixed；3. under conditions of plus confined pressure, with 1ml/min flow injection guanidine that glue solution, until core holding unit outlet
End flows down the first drop of liquid and constantly has liquid outflow later, and now the manometric reading of entrance point is the breakthrough pressure of diverting agent
Power.As a result show that the modified vinals of 2mm can not form temporarily stifled, vinal modified 4mm is in mulling
Concentration is 10kg/m3Lower breakthrough pressure reaches 0.2MPa, and modified 6~8mm vinal is 10kg/ in mulling concentration
m3Lower breakthrough pressure reaches 0.25~0.3MPa, considers, and chooses the modified vinals of 6~8mm.
Design fiber support sand body caves in experiment, preferably goes out the step 2) in selection modified vinal
A diameter of 10 μm.
The fiber support sand body experimentation that caves in is as follows：It is the tubing string that 12.7cm, internal diameter are 22mm to choose 4 length, point
Pipe is not connected, is furnished with screen cloth in outlet, with the guanidine that glue solution that mass fraction is 0.5%（0.5g guanidines are added i.e. in 100g water
That glue）Carrying proppant and diameter are respectively that 5 μm, 10 μm, 15 μm and 20 μm of modified vinal flows through screen cloth,
The proppant and modified vinal of 20/40 mesh are left, then is rinsed 30 minutes with running water；Four pipes are independent
, flushing hole is the flange that a diameter of 1.27cm is fixed on each tube outlet；Running water passes through each tubing string, the flow of fluid
Gradually increase, until the destruction of sand/fiber sand body, record by the flow of tubing string and pressure drop that (result takes being averaged for four tubing strings
Value).As a result show, measured using a diameter of 10 μm of modified vinal by the flow of tubing string and pressure drop most
Greatly, it is therefore preferable that a diameter of 10 μm of modified vinal.
In addition, design fracture guide instrument simulation fibre fracture temporarily blocks up experiment, preferably modified vinal plus
Dosage.
It is as follows that fracture guide instrument simulation fibre fracture temporarily blocks up experimentation：1. the guanidine that configuration 50ml mass fractions are 0.3%
Glue solution, will be 0.9%, 1.2%, 1.5% relative to the mass fraction of proppant（14.4kg/m3、19.2kg/m3、24kg/m3）
Modified vinal be dispersed in guanidine your glue solution, add crosslinking agent and be allowed to be crosslinked, then add 63g
Ceramsite propping agent, by 9.76kg/m2Concentration is laid to add in diversion chamber；2. CDY-2006 proppant fracture condudtiviies are connected
Tester；3. diversion chamber is sealed plus 1MPa or so confined pressure using hydraulic press, closes experimental line, opening vacuum machine will be whole
Until vacuumizing inside individual laboratory apparatus, then with the distillation whole circuit of water saturation；4. in 2~5MPa of confined pressure, flow 2.5ml/
Measured in the case of min, 5ml/min.As a result show, plus dosage is that 0.9%, 1.2%, 1.5% modified polyvinyl alcohol is fine
Dimension, can reach 2.92MPa, 6.00MPa, 6.01MPa respectively in the case of confined pressure 5MPa, consider construction and economic factor,
It is preferred that it is 1.2% to go out modified vinal relative to the mass fraction of proppant.
Temporarily chink damage experiment to above-mentioned preferred modified vinal design fiber, and experimentation is such as
Under：(1) by rock core vacuumizing, saturation simulation stratum water；(2) it is positive to survey rock core water phase permeability；(3) along rock core axially by rock core
Rive a man-made fracture, one layer of proppant is spread in fracture surface, simulation fracturing fracture simultaneously determines fracture permeabgility；(4) will be preferred
Modified vinal forward direction drive in rock core, rock core water phase permeability is surveyed in positive displacement.As a result show, using excellent
The modified vinal of choosing is temporarily blocked up after pressure break, and resume permeability rate can reach 91.37%~94.17%, with routine temporarily
Stifled pressure break is compared, and the resume permeability rate that temporarily chinks can improve 20~30%.
Meanwhile, optimize the keys such as fiber consumption, operational discharge capacity according to reservoir property, hydraulic fluid plus sand concentration and apply
Work parameter, improves temporarily stifled pressure break success rate, and the volume fraction that the proppant accounts for fracturing working fluid is 30%；The step 3) in
The operational discharge capacity of active water is 0.4m3/min；The step 5) in prepad fluid operational discharge capacity be 2.4m3/min。
In summary, this temporary stall based on the modified vinal in surface that provides of the present invention is to fracturing process
By the way that sand packed fracture is temporarily blocked up by old crack or, with making new seam on primary fracture at an angle direction.Formed behind new crack,
Old crack temporarily block up fiber can voluntarily de-plugging, link up more intrinsic fractures and first crack and do not employ region, form new splits
Aerial drainage system is stitched, so as to improve oil and gas production and oil gas field ultimate recovery, the old well production of recovery is solved and realizes new well
The problem of fracturing yield increasing.
It is exemplified as above be only to the present invention for example, do not constitute the limitation to protection scope of the present invention, it is all
It is to be belonged to the same or analogous design of the present invention within protection scope of the present invention.The portion that the present embodiment is not described in detail
Part and technique belong to the well-known components and conventional means of the industry, do not describe one by one here.
Claims (8)
1. a kind of temporary stall based on the modified vinal in surface is to fracturing process, it is characterised in that：Including following step
Suddenly：
1) surface modification is carried out to water-soluble polyvinyl alcohol fibers, obtains modified vinal；
2) preparation of fracturing working fluid；Preparing mass fraction, your glue crosslinked fluid makees prepad fluid for 0.3% guanidine, and proppant accounts for guanidine that
The volume fraction of glue crosslinked fluid is 15%~30%, modified vinal account for the mass fraction of proppant for 1.2%~
1.8%, the length of modified vinal is 6~8mm, a diameter of 10 μm；
3) liquid in extrusion pit shaft is replaced with 0.4~0.5m3/min operational discharge capacity using active water；
4) after the liquid in pit shaft is drained, with 0.6~2.0m3/ min operational discharge capacity setting fracture packer；
5) after fracturing packer is set, with 2.4~3.0m3/ min operational discharge capacity injection prepad fluid 45m3, form major fracture；
6) the major fracture staged to formation injects the load fluid of guanidine that glue crosslinked fluid and proppant composition, and staged sand proportion is dense
Degree be followed successively by 10%-15%-20%-28%-30%, sand proportion concentration be the 10%-15%-20%-28% stages add be not added with it is modified
The load fluid of vinal, sand proportion concentration for 30% stage load fluid in start to be mixed into step 2) in prepare account for
The mass fraction of proppant is 1.2%~1.8% modified vinal, and injection stratum forms new branch's seam；
7) to the new branch seam injection 27m of formation3Prepad fluid, expand seam length；
8) to your glue crosslinked fluid of the new branch of formation seam staged injection guanidine and the load fluid of proppant composition, sand proportion concentration according to
Secondary is 10%-15%-20%-25%-30%；
9) with 2.4~3.0m3/ min operational discharge capacity is with active water for the load fluid in extrusion pit shaft.
2. the temporary stall as claimed in claim 1 based on the modified vinal in surface is to fracturing process, its feature exists
In：The step 1) in using chromic acid solution to water-soluble polyvinyl alcohol fibers carry out surface modification.
3. the temporary stall as claimed in claim 1 based on the modified vinal in surface is to fracturing process, its feature exists
In：The step 1) in use KMnO4/ sulfuric acid carries out grafted propylene acid as initiator, to water-soluble polyvinyl alcohol fibers and changed
Property.
4. the temporary stall as claimed in claim 1 based on the modified vinal in surface is to fracturing process, its feature exists
In：The step 1) in using methacryloxypropyl trimethoxy silane water/ethanol solution to water-soluble polyethylene
Alcohol fiber carries out surface modification.
5. the temporary stall as claimed in claim 1 based on the modified vinal in surface is to fracturing process, its feature exists
In：The modified vinal is 1.2% relative to the mass fraction of proppant.
6. the temporary stall as claimed in claim 1 based on the modified vinal in surface is to fracturing process, its feature exists
In：The volume fraction that the proppant accounts for fracturing working fluid is 30%.
7. the temporary stall as claimed in claim 1 based on the modified vinal in surface is to fracturing process, its feature exists
In：The step 3) in active water operational discharge capacity be 0.4m3/min。
8. the temporary stall as claimed in claim 1 based on the modified vinal in surface is to fracturing process, its feature exists
In：The step 5) in prepad fluid operational discharge capacity be 2.4m3/min。
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