CN102020984A - In-fissure diversion fracturing temporary blocking agent for low-permeability oilfield, and preparation method and application thereof - Google Patents
In-fissure diversion fracturing temporary blocking agent for low-permeability oilfield, and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to an in-fissure diversion fracturing temporary blocking agent for a low-permeability oilfield, and a preparation method and application thereof. The temporary blocking agent is prepared by the following steps of: mixing 92 mass percent of bone glue powder, 0.2 mass percent of benzoic acid, 5 mass percent of modified starch, 1.3 mass percent of hydroxyethyl cellulose, 1.0 mass percent of F-containing surfactant and 0.5 mass percent of cross-linking agent; adding polyoxyethylene diacrylate with concentration of between 5 and 100mg/L and an initiator with concentration of between 100 and 500mg/L and reacting at the temperature of 80 DEG C under the pressure of 1.2MPa for gelling; and granulating, applying oil and drying, wherein the maximum expansion ratio is 1.33; the agent has high temperature resistance stability and stable adhesion; the maximum elongation is 64 percent; the breakthrough pressure gradient reaches 30.0MPa/m; the viscosity is 35mPa.s after the agent is completely dissolved at the temperature of 60 DEG C; and the agent can be completely flowed back under the action of the carrying of fracturing liquid.
Description
Technical field:
The present invention relates to turn to pressure break temporary plugging agent and its production and application in a kind of seam that is applied to the transformation of low permeability oil field reservoir refracturing.
Background technology:
Low permeability oil field adopts conventional multiple fracturing technique to excavate the stratum potentiality usually, improves the oil well per-well production, this technology mainly is to add a certain amount of propping agent again to the stratum, again put the shop of realizing propping agent in former crack, improves fracture flow capacity, realizes the purpose of volume increase.Still there is certain limitation in this technology in volume increase: one, well higher for producing energy, that the effective response for water flood history is arranged is implemented conventional multiple fracturing technique, causes the excessive extension of man-made fracture, finally cause refracturing after well water rise too fast; Its two, for the low yield poor efficiency well that is in waterline direction in the injection-production pattern, the excessive extension for fear of man-made fracture along the waterline direction, the common scale of conventional refracturing is less, pressure break does not form new draining district, fracturing effect is relatively poor; Its three, for the oil well that is in oil reservoir limit portion, owing to there is not perfect injection-production pattern, do not set up rational injection-production relation, producing energy keeps level lower, causes conventional refracturing effect relatively poor.
Summary of the invention:
The objective of the invention is to develop a kind of solid granule temporary plugging agent, add an amount of this viscoelastic solid granule temporary plugging agent to the stratum, fluid flow is followed to the minimum direction mobile of resistance principle, the temporary plugging agent particle enters the borehole of pit shaft, part enters crack or the most permeable zone in the stratum, produce the filter cake bridge blinding at borehole and high permeability zone, formation is higher than the pressure difference of gash fracture pressure, follow-up work liquid can not be entered to crack and high permeability zone, thereby fracturing liquid enters area of high stress or new fracture layers, impels the generation of new seam and the shop of propping agent to put variation.Link up and do not employed the draining district, reach the purpose of volume increase.
This viscoelastic solid granule temporary plugging agent outward appearance of the present invention is brownish black or the irregular solid particulate of black, particle diameter 5-8mm, by a certain proportion of gelatine powder, phenylformic acid, treated starch, Natvosol, contain the F tensio-active agent, linking agent, ammonium persulphate, polyoxyethylene diacrylate activates into glue by the potential energy of action of evocating crosslinking reaction and physics method under high-temperature and high-pressure conditions, form the polymer of crosslinked body structure, pass through granulation then, oil, stoving process forms, and has the breakthrough pressure height, can be water-soluble, salt resistant character is good, characteristics such as inierpeneirating network structure preferably.
Preparation process condition is: 80 ℃ of temperature, pressure 1.2Mpa, and gelatine powder, phenylformic acid, treated starch, Natvosol, the quality proportioning that contains F tensio-active agent (perfluoroalkyl acrylate), linking agent (borax) they are 92%: 0.2%: 5%: 1.3%: 1.0%: 0.5%; Oxygen ethylene chain joint number is preferred 5～10 in the polyoxyethylene diacrylate molecule, and concentration is 5～100mg/L; Polyoxyethylene diacrylate is a kind of chainextender, and a small amount of adding can improve the molecular weight of multipolymer, guarantees that formed temporary plugging agent has the good filtration capacity that turns to, falls in injection process; And the polymer that forms by the polyoxyethylene diacrylate chain extension, its ester bond can decompose, and temperature is high more, decomposes soon more, and these characteristics make that temporary plugging agent can be water-soluble, help the row of returning.Initiator initiator system of ammonium persulfate, formaldehyde or sodium hydrosulfite, concentration are 100～500mg/L.
To determining of stratum add-on
The consumption of fracture propagation control agent is relevant with the pressure drop of bearing, fluid viscosity, filter cake intensity etc.
Rcake＝Δpcake/μu?ake＝Δpcake/μu (1)
Rcake in the formula---resistance of filter cake, m-1;
Δ p---the pressure drop of filter cake both sides; μ---transport fluid viscosity; U---flow through the area flow of filter cake.
Define a specific resistance of filter cake α, unit is m/kg:
α＝1/ρdiv(1-φcake)Kcake (2)
Can obtain pressure drop by this formula by filter cake:
Δp＝αμucdivρdivV/A (3)
ρ div in the formula---turn to particulate density, kg/m3; The porosity of φ cake---filter cake;
Kcake---filter cake rate of permeation;
Cdiv---turn to particulate concentration, m3 particle/m3 solution;
V---inject the cumulative volume that turns to liquid; The surface-area of A---filter cake.
Darcy law by filter cake can get formula (3)
Δp＝μlu/Kcake (4)
The liquid measure of filter cake thickness l and injectant is closed: l=cdivV/ (1-φ cake) A (5)
The α of combined type (2) definition then draws the expression formula (3) by the pressure drop of filter cake.The pass of resistance of filter cake Rcake and specific resistance of filter cake α is:
Rcake＝αcdivρdivV/A (6)
Rcake＝Δpcake/μu (1)
Rcake in the formula---resistance of filter cake, m-1;
Δ p---the pressure drop of filter cake both sides;
μ---transport fluid viscosity;
U---flow through the area flow of filter cake.
The equation of the growth of filter cake:
dρaj/dt＝2πKjhjΔP/μ[ln(re/rw)+Sj+2πKjhjRcakej/A]×c’div/Aj。
2006-2008 in Jingan County, oil fields such as Wuqi County, the You Fang village have implemented 32 mouthfuls of well test in places, the average individual well of the oil well oily 1.86t that increases day by day, accumulative total increases oil and has reached 6928.43t, has obtained test in place effect preferably.
Turn to pressure break temporary plugging agent performance in the low permeability oil field seam:
1) temporary plugging agent swelling property and solvability evaluation: the volume of temporary plugging agent is along with the increase of time becomes big earlier, and maximum ratio of expansion is 1.33, reaches high adsorptive power.After dissolving in 8 hours, temporary plugging agent can dissolve fully.
2) temporary plugging agent temperature resistance estimation of stability: according to the laboratory experiment result, temperature is less to the expansion multiple proportions influence of temporary plugging agent sample, the temperature resistance good stability.
3) the adhesivity evaluation of temporary plugging agent and wall: according to experimental result, temporary plugging agent can rise sticking in 20-30min, and adhesivity is stable.
4) temporary plugging agent anamorphic stretching merit rating: temporary plugging agent maximum elongation rate is 64%, pressure-bearing elongation better performances, and toughness is better.
5) the temporary plugging agent plugging strength is estimated: determine that through overtesting the breakthrough pressure gradient of temporary plugging agent reaches 30.0MPa/m.
6) temporary plugging agent returns row's performance evaluation: the temporary plugging agent sample under 60 ℃ of conditions fully the viscosity number after the dissolving be 35mPa.s, under of the fracturing fluid rolling action, can return fully and eject.
Description of drawings
The long celebrating of Fig. 1 oil field willow 91-26 well construction graphic representation.
The long celebrating of Fig. 2 oil field willow 91-26 well construction graphic representation.
The real-time monitoring curve figure of Fig. 3 bottomhole wellbore pressure.
Fig. 4 production pattern.
Embodiment
Embodiment 1
The preparation temporary plugging agent:
Preparation process condition is: 80 ℃ of temperature, pressure 1.2Mpa,
Raw material: gelatine powder, phenylformic acid, treated starch, Natvosol, contain F tensio-active agent (perfluoroalkyl acrylate), linking agent (borax), polyoxyethylene diacrylate (oxygen ethylene chain joint number preferred 5～10 in the polyoxyethylene diacrylate molecule), initiator (ammonium persulphate).
Preparation process: with gelatine powder, phenylformic acid, treated starch, Natvosol, contain F tensio-active agent (perfluoroalkyl acrylate), linking agent (borax) is 92%: 0.2%: 5% by the quality proportioning: mixing in 1.3%: 1.0%: 0.5%; Add an amount of polyoxyethylene diacrylate (oxygen ethylene chain joint number preferred 5～10 in the polyoxyethylene diacrylate molecule, concentration is 5～100mg/L) and initiator (ammonium persulphate, concentration is 100～500mg/L), under 80 ℃ of temperature, pressure 1.2Mpa condition, be reacted into glue, pass through granulation then, oil, dry.Long celebrating oil field Liu91-26Jing
1. zone of interest master data
The measure foundation
This well on August 30th, 2002 goes into operation, in December, 2004 effective response for water flood, output 5.45m
3Liquid measure is low to moderate 1.97m at present
3, this well reservoir physical property is good, and offset well 90-27,91-27 output are all at 6m
3More than; The present liquid measure of this well descends, and temporarily stifled pressure break is implemented in suggestion, improves single well productivity, and liquid is adopted on balanced plane.
3. infusion program
4. construction curve
5. bottomhole wellbore pressure is monitored in real time
It is mild that mini-frac, main pressure break pressure surge all occurs in earlier stage, " net pressure " curve adds the sand section, illustrates that reservoir natural fracture potentialities of development is bigger.
The parting pressure of mini-frac is 22.347MPa, and the parting pressure of main pressure break is 43.446MPa, and temporary plugging agent shutoff crack effect is obvious.
6. yield curve.
Claims (5)
1. turn to the preparation method of pressure break agent in the low permeability oil field seam, it is characterized in that: with gelatine powder, phenylformic acid, treated starch, Natvosol, contain the F tensio-active agent, linking agent is 92%: 0.2%: 5% by the quality proportioning: mixing in 1.3%: 1.0%: 0.5%; Add polyoxyethylene diacrylate, concentration is that 5～100mg/L and initiator concentration are 100～500mg/L, is reacted into glue under 80 ℃ of temperature, pressure 1.2Mpa condition, then through granulation, oil, dry and form.
2. turn to the preparation method of pressure break agent in a kind of low permeability oil field seam according to claim 1, it is characterized in that: oxygen ethylene chain joint number is 5～10 in the polyoxyethylene diacrylate molecule.
3. turn to the preparation method of pressure break agent in a kind of low permeability oil field seam according to claim 1, it is characterized in that: containing the F tensio-active agent is perfluoroalkyl acrylate; Linking agent is a borax; Initiator is ammonium sulfate, formaldehyde or sodium hydrosulfite.
4. turn to the pressure break agent in a low permeability oil field seam, it is characterized in that: it is to turn to the preparation method of pressure break agent to be prepared from the low permeability oil field seam according to claim 1.
5. turn to the application of pressure break agent in the described low permeability oil field of claim 4 stitches, it is characterized in that: add temporary plugging agent to the stratum, fluid flow is followed to the minimum direction mobile of resistance principle, the temporary plugging agent particle enters the borehole of pit shaft, part enters crack or the most permeable zone in the stratum, produce the filter cake bridge blinding at borehole and high permeability zone, formation is higher than the pressure difference of gash fracture pressure, follow-up work liquid can not be entered to crack and high permeability zone, thereby fracturing liquid enters area of high stress or new fracture layers, impels the generation of new seam and the shop of propping agent to put variation.
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