CN104727800A - Temporary blocking turnaround fracturing method based on surface modified polyvinyl alcohol fibers - Google Patents
Temporary blocking turnaround fracturing method based on surface modified polyvinyl alcohol fibers Download PDFInfo
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Abstract
The invention particularly provides a temporary blocking turnaround fracturing method based on surface modified polyvinyl alcohol fibers. The method comprises the following steps that 1, the surfaces of the water-soluble poly(vinyl alcohol) fibers are modified; 2, fracturing work liquid is prepared; 3, liquid in a shaft is extruded out by and replaced with active water; 4, setting is carried out on a facture packer; 5, prepad fluid is injected, and a major fracture is formed; 6, the water-soluble degradable fiber temporary blocking fracturing liquid is injected into the formed major fracture in a step mode and injected into a stratum to form a new branch fracture; 7, the prepad fluid is injected into the formed new branch fracture, and the length of the fracture is expanded; 8, sand-carrying liquid is injected into the formed new branch fracture in a step mode; 9, the sand-carrying liquid in the shaft is extruded out by and replaced with active water. An old facture or a facture filled with sand is temporarily blocked, the new fractures are made on the original fracture in a certain angle direction, more unused areas of natural fractures and primary fractures are communicated, a new fracture flow leakage system is formed, oil and gas production and the ultimate recovery factor of an oil and gas field are improved, and the aims of restoring the yield of an old well and achieving facture production increase of a new well are achieved.
Description
Technical field
The invention belongs to In Oil Field Exploration And Development underground work technical field, be specifically related to a kind of temporary stall based on vinal after surface modification to fracturing process, improve recovery ratio for Low permeable oil and gas reservoirs.
Background technology
Long celebrating oil gas field has typical low pressure, hypotonic, low yield feature.Along with going deep into of exploitation, the hydraulic fracture of a class reservoir of early stage pressure break had lost efficacy or had produced blocking, and the permeance property of primary fracture reduces even ineffective greatly.Meanwhile, because early stage fracturing reform scale is inadequate, or supporting crack is short, or fracture condudtiviy is low, and this kind of well must strengthen pressure break scale to be continued to extend primary fracture, or puies forward high sand ratio/sand amount to increase fracture condudtiviy, could improve well capacity.
In addition, after exploiting for a long time, the crude oil that early stage fracturing fracture controls is adopted to the greatest extent substantially, the crude oil of slit band far away cannot supplement in time, and water flooding recovery makes water filling forward position advance to producing well for a long time, some old crack has become the central core of circulation of water, and this have impact on production well yield to a great extent.
Moreover for Chan Jian district, under certain condition, new well is implemented turnaround fracture and can be produced many cracks, thus increases natural gas seepage area, improves gas output per well; But it is low that conventional turnaround fracture technology exists reservoir reconstruction degree, and measure period of validity is short, granular pattern diverting agent is large to reservoir damage, the problem such as to degrade not thorough.
Summary of the invention
The old crack oil and gas that the object of the invention is to overcome early stage pressure break yields poorly, recovery ratio is low, and conventional turnaround fracture technology to there is reservoir reconstruction degree low, measure period of validity is short, and granular pattern diverting agent is large to reservoir damage, the problem such as to degrade not thorough.
For this reason, the invention provides a kind of temporary stall based on vinal after surface modification to fracturing process, comprise the steps:
1) surface modification is carried out to water-soluble polyvinyl alcohol fibers, obtain modified vinal;
2) preparation of fracturing working fluid; Preparation mass fraction be 0.3% your glue of guanidine crosslinked fluid make prepad fluid, it is 15% ~ 30% that proppant accounts for your volume fraction of glue crosslinked fluid of guanidine, and the mass fraction that modified vinal accounts for proppant is 1.2% ~ 1.8%;
3) use active water with 0.4 ~ 0.5m
3the operational discharge capacity of/min is for the liquid extruded in pit shaft;
4) after the liquid in pit shaft drains, with 0.6 ~ 2.0m
3the operational discharge capacity setting fracture packer of/min;
5) after fracturing packer sets, with 2.4 ~ 3.0m
3the operational discharge capacity of/min injects prepad fluid 45m
3, form major fracture;
6) the major fracture staged formed is injected to the load fluid of guanidine that glue crosslinked fluid and proppant composition, staged sand proportion concentration is followed successively by 10%-15%-20%-28%-30%, be the 10%-15%-20%-28% stage add the load fluid not adding modified vinal in sand proportion concentration, be start to be mixed into step 2 in the load fluid in 30% stage in sand proportion concentration) in prepare the mass fraction accounting for proppant be 1.2% ~ 1.8% modified vinal, inject stratum formed new branch seam;
7) 27m is injected to the new branch seam formed
3prepad fluid, expand seam long;
8) the new branch seam staged formed is injected to the load fluid of guanidine that glue crosslinked fluid and proppant composition, sand proportion concentration is followed successively by 10%-15%-20%-25%-30%;
9) with 2.4 ~ 3.0m
3the operational discharge capacity active water of/min is for the load fluid extruded in pit shaft.
Described step 1) in adopt chromic acid solution surface modification is carried out to water-soluble polyvinyl alcohol fibers.
Described step 1) middle employing KMnO
4/ sulfuric acid, as initator, carries out graft acrylic acid modification to water-soluble polyvinyl alcohol fibers.
Described step 1) in adopt the water/ethanolic solution of methacryloxypropyl trimethoxy silane to carry out surface modification to water-soluble polyvinyl alcohol fibers.
Described step 2) in the length of modified vinal selected be 6 ~ 8mm.
Described step 2) in the diameter of modified vinal selected be 10 μm.
Described modified vinal is 1.2% relative to the mass fraction of proppant.
The volume fraction that described proppant accounts for fracturing working fluid is 30%.
Described step 3) in the operational discharge capacity of active water be 0.4m
3/ min.
Described step 5) in the operational discharge capacity of prepad fluid be 2.4m
3/ min.
Beneficial effect of the present invention: this technology to fracturing process, water-soluble biodegradable fiber and conventional pressure break are combined into based on the temporary stall of vinal after surface modification provided by the invention, propose your working solution of glue+proppant composition of the water-soluble polyvinyl alcohol fibers after by surface modification+guanidine and form interim slug in old crack, produce certain net-head, this pressure reduction presses off new crack this layer of position, form many cracks system, expand drainage area; After pressure break, the crack action effect time increases, better effects if; Activities is simple, and cost is lower, can increase substantially field produces benefit.
Below with reference to accompanying drawing, the present invention is described in further details.
Accompanying drawing explanation
Fig. 1 is the blocking grid schematic diagram that water-soluble polyvinyl alcohol fibers modified in the present invention is formed in proppant.
Fig. 2 be water-soluble polyvinyl alcohol fibers modified in the present invention temporarily stifled refracturing form new branch seam schematic diagram.
Detailed description of the invention
Embodiment 1:
In order to the old crack oil and gas overcoming early stage pressure break yield poorly, recovery ratio is low, and conventional turnaround fracture technology to there is reservoir reconstruction degree low, measure period of validity is short, granular pattern diverting agent is large to reservoir damage, the problem such as to degrade not thorough, present embodiments provide a kind of temporary stall based on vinal after surface modification as depicted in figs. 1 and 2 to fracturing process, comprise the steps:
1) surface modification is carried out to water-soluble polyvinyl alcohol fibers, obtain modified vinal;
2) preparation of fracturing working fluid; Preparation mass fraction be 0.3% your glue of guanidine crosslinked fluid make prepad fluid, it is 15% ~ 30% that proppant accounts for your volume fraction of glue crosslinked fluid of guanidine, and the mass fraction that modified vinal accounts for proppant is 1.2% ~ 1.8%;
3) use active water with 0.4 ~ 0.5m
3the operational discharge capacity of/min is for the liquid extruded in pit shaft;
4) after the liquid in pit shaft drains, with 0.6 ~ 2.0m
3the operational discharge capacity setting fracture packer of/min;
5) after fracturing packer sets, with 2.4 ~ 3.0m
3the operational discharge capacity of/min injects prepad fluid 45m
3, form major fracture;
6) the major fracture staged formed is injected to the load fluid of guanidine that glue crosslinked fluid and proppant composition, staged sand proportion concentration is followed successively by 10%-15%-20%-28%-30%, be the 10%-15%-20%-28% stage add the load fluid not adding modified vinal in sand proportion concentration, be start to be mixed into step 2 in the load fluid in 30% stage in sand proportion concentration) in prepare the mass fraction accounting for proppant be 1.2% ~ 1.8% modified vinal, inject stratum formed new branch seam;
7) 27m is injected to the new branch seam formed
3prepad fluid, expand seam long;
8) the new branch seam staged formed is injected to the load fluid of guanidine that glue crosslinked fluid and proppant composition, sand proportion concentration is followed successively by 10%-15%-20%-25%-30%;
9) with 2.4 ~ 3.0m
3the operational discharge capacity active water of/min is for the load fluid extruded in pit shaft.
Step 6) in modified vinal added by Full-automatic fiber dispersion, metering and adding apparatus, realize fiber add efficiently be connected with measuring truck, fracturing blender truck, quantified controlling.
This technology to fracturing process, water-soluble biodegradable fiber and conventional pressure break are combined into based on the temporary stall of vinal after surface modification that this invention provides, propose your working solution of glue+proppant composition of the water-soluble polyvinyl alcohol fibers after by surface modification+guanidine and form interim slug in old crack, produce certain net-head, this pressure reduction presses off new crack this layer of position, form many cracks system, expand drainage area; After pressure break, the crack action effect time increases, better effects if; Activities is simple, and cost is lower, can increase substantially field produces benefit.
Embodiment 2:
On the basis of embodiment 1, described step 1) in chromic acid solution can be adopted to carry out surface modification to water-soluble polyvinyl alcohol fibers, the formula of chromic acid solution is K
2cr
2o
7, H
2o and dense H
2sO
4water-soluble polyvinyl alcohol fibers, than being 5:8:100, is soaked 2.5h by amount under this chromic acid solution chromic acid solution room temperature condition.
Described step 1) in can also adopt KMnO
4/ sulfuric acid, as initator, carries out graft acrylic acid modification to water-soluble polyvinyl alcohol fibers, KMnO
4concentration is 5 × 10
-3mol/L, sulfuric acid concentration are 0.2mol/L, acrylic acid concentration is 0.8mol/L, the reaction time is 3.0h.
Described step 1) in the water/ethanolic solution of methacryloxypropyl trimethoxy silane can also be adopted to carry out surface modification to water-soluble polyvinyl alcohol fibers, concentration is 25 × 10
-3the cumyl peroxide of mol/L makes initator, methacryloxypropyl trimethoxy silane monomer concentration is 0.1mol/L, by water-soluble polyvinyl alcohol fibers dip time 24 hours in the water/ethanolic solution of this methacryloxypropyl trimethoxy silane, concentration of alcohol 10%.
Above-mentioned three kinds carried out in the method for surface modification to water-soluble polyvinyl alcohol fibers, water-soluble polyvinyl alcohol fibers adsorption methacryloxypropyl trimethoxy silane molecule, hydroscopicity is the highest, reaches 0.41%.
Water-soluble polyvinyl alcohol fibers preferably used in stifled refracturing construction temporarily, water/the ethanolic solution of methacryloxypropyl trimethoxy silane is selected to carry out surface modification to water-soluble polyvinyl alcohol fibers, obtain modified vinal, this process for modifying surface improves water-soluble polyvinyl alcohol fibers and fracturing fluid Homogeneous phase mixing speed more than 30%, degree of scatter is good, without phenomenon of obviously uniting, 10d degradable more than 85% within 90 DEG C, effective reduction proppant settlement rate more than 50%, modified water-soluble polyvinyl alcohol fibers network of fibers and proppant form complex, its stabilization time improves 1 ~ 2 times, proppant backflow amount reduces by more than 80%.
Embodiment 3:
On the basis of embodiment 1 and embodiment 2, design fiber is stifled displacement test temporarily, optimizes described step 2) in the length of modified vinal be 6 ~ 8mm.
The process of fiber stifled displacement test is temporarily as follows: 1. by rock core from centre by being axially cut into the even two halves that section is rectangle; 2. uniform spreading is mixed with the proppant of the modified vinal of different length in two semisynthetic gaps, is fixed; 3., under the condition adding confined pressure, inject guanidine that glue solution with the flow of 1ml/min, until outlet port of rock core holder flows down the first drop of liquid and constantly has liquid to flow out later, now the manometric reading of entrance point is the breakthrough pressure of diverting agent.The modified vinal of result display 2mm cannot be formed stifled temporarily, and the modified vinal of 4mm is 10kg/m in mulling concentration
3lower breakthrough pressure reaches 0.2MPa, and the modified vinal of 6 ~ 8mm is 10kg/m in mulling concentration
3lower breakthrough pressure reaches 0.25 ~ 0.3MPa, considers, and chooses the vinal that 6 ~ 8mm is modified.
Design fiber support sand body caves in experiment, optimizes described step 2) in the diameter of modified vinal selected be 10 μm.
The fiber support sand body experimentation that caves in is as follows: choose that 4 length are 12.7cm, internal diameter is the tubing string of 22mm, connecting pipe respectively, screen cloth is furnished with in outlet, carry with your glue solution of guanidine (namely adding 0.5g guanidine that glue in 100g water) that mass fraction is 0.5% the modified vinal that proppant and diameter be respectively 5 μm, 10 μm, 15 μm and 20 μm and flow through screen cloth, leave 20/40 object proppant and modified vinal, then use tap water 30 minutes; Four pipes are independently, and flushing hole is diameter is the flange that 1.27cm is fixed on each tube outlet; Tap water is by each tubing string, and the flow of fluid increases gradually, until sand/fiber sand body destroys, records the flow by tubing string and pressure drop (result gets the average of four tubing strings).Result shows, use diameter be the modified vinal of 10 μm record by the flow of tubing string and pressure drop maximum, therefore, preferably modified vinal diameter is 10 μm.
In addition, the stifled experiment temporarily of design fracture guide instrument simulation fibre fracture, preferably modified vinal add dosage.
Stifled experimentation is as follows temporarily for fracture guide instrument simulation fibre fracture: 1. configure your glue solution of guanidine that 50ml mass fraction is 0.3%, be 0.9% by the mass fraction relative to proppant, 1.2%, 1.5%(14.4kg/m
3, 19.2kg/m
3, 24kg/m
3) modified vinal be dispersed in your glue solution of guanidine, add crosslinking agent and make it crosslinked, then add 63g ceramsite propping agent, by 9.76kg/m
2laid concentration adds in diversion chamber; 2. CDY-2006 proppant fracture condudtiviy tester is connected; 3. use hydraulic press to add about 1MPa confined pressure, diversion chamber seal, closes experimental line, open vacuum machine by whole laboratory apparatus inside until vacuumize, then use the saturated whole circuit of distilled water; 4. at confined pressure 2 ~ 5MPa, flow 2.5ml/min, measure when 5ml/min.Result shows, add dosage be 0.9%, 1.2%, 1.5% modified vinal, 2.92MPa can be reached respectively in confined pressure 5MPa situation, 6.00MPa, 6.01MPa, consider construction and economic factor, optimizing modified vinal relative to the mass fraction of proppant is 1.2%.
To chink temporarily damage experiment to above-mentioned preferably modified vinal design fiber, experimentation is as follows: (1) by rock core vacuumizing, saturation simulation formation water; (2) forward surveys rock core water phase permeability; (3) along core axis to a man-made fracture of being rived by rock core, spread one deck proppant at fracture surface, simulation fracturing fracture also measures fracture permeabgility; (4) drive in rock core by preferably modified vinal forward, rock core water phase permeability is surveyed in forward displacement.Result shows, and after using preferably modified vinal to block up pressure break temporarily, resume permeability rate can reach 91.37% ~ 94.17%, and compared with routine temporarily stifled pressure break, the resume permeability rate that chinks temporarily can improve 20 ~ 30%.
Meanwhile, according to reservoir property, hydraulic fluid, add sand concentration and be optimized the critical construction such as fiber consumption, operational discharge capacity parameter, improve stifled pressure break success rate temporarily, the volume fraction that described proppant accounts for fracturing working fluid is 30%; Described step 3) in the operational discharge capacity of active water be 0.4m
3/ min; Described step 5) in the operational discharge capacity of prepad fluid be 2.4m
3/ min.
In sum, this temporary stall based on vinal after surface modification provided by the invention to fracturing process by by old crack or sand packed fracture block up temporarily, with primary fracture at an angle direction on make new seam.After forming new crack, old crack temporarily stifled fiber can de-plugging voluntarily, link up more intrinsic fracture and region is not employed in first crack, form new crack earial drainage system, thus improve oil and gas production and oil gas field ultimate recovery, solve the difficult problem recovered old well production and realize new well fracturing yield increasing.
More than exemplifying is only illustrate of the present invention, does not form the restriction to protection scope of the present invention, everyly all belongs within protection scope of the present invention with the same or analogous design of the present invention.The parts that the present embodiment does not describe in detail and technique belong to well-known components and the conventional means of the industry, do not describe one by one here.
Claims (10)
1. based on the temporary stall of vinal after surface modification to a fracturing process, it is characterized in that: comprise the steps:
1) surface modification is carried out to water-soluble polyvinyl alcohol fibers, obtain modified vinal;
2) preparation of fracturing working fluid; Preparation mass fraction be 0.3% your glue of guanidine crosslinked fluid make prepad fluid, it is 15% ~ 30% that proppant accounts for your volume fraction of glue crosslinked fluid of guanidine, and the mass fraction that modified vinal accounts for proppant is 1.2% ~ 1.8%;
3) use active water with 0.4 ~ 0.5m
3the operational discharge capacity of/min is for the liquid extruded in pit shaft;
4) after the liquid in pit shaft drains, with 0.6 ~ 2.0m
3the operational discharge capacity setting fracture packer of/min;
5) after fracturing packer sets, with 2.4 ~ 3.0m
3the operational discharge capacity of/min injects prepad fluid 45m
3, form major fracture;
6) the major fracture staged formed is injected to the load fluid of guanidine that glue crosslinked fluid and proppant composition, staged sand proportion concentration is followed successively by 10%-15%-20%-28%-30%, be the 10%-15%-20%-28% stage add the load fluid not adding modified vinal in sand proportion concentration, be start to be mixed into step 2 in the load fluid in 30% stage in sand proportion concentration) in prepare the mass fraction accounting for proppant be 1.2% ~ 1.8% modified vinal, inject stratum formed new branch seam;
7) 27m is injected to the new branch seam formed
3prepad fluid, expand seam long;
8) the new branch seam staged formed is injected to the load fluid of guanidine that glue crosslinked fluid and proppant composition, sand proportion concentration is followed successively by 10%-15%-20%-25%-30%;
9) with 2.4 ~ 3.0m
3the operational discharge capacity active water of/min is for the load fluid extruded in pit shaft.
2. as claimed in claim 1 based on the temporary stall of vinal after surface modification to fracturing process, it is characterized in that: described step 1) in adopt chromic acid solution to carry out surface modification to water-soluble polyvinyl alcohol fibers.
3. the temporary stall based on vinal after surface modification as claimed in claim 1 is to fracturing process, it is characterized in that: described step 1) middle employing KMnO
4/ sulfuric acid, as initator, carries out graft acrylic acid modification to water-soluble polyvinyl alcohol fibers.
4. as claimed in claim 1 based on the temporary stall of vinal after surface modification to fracturing process, it is characterized in that: described step 1) in adopt the water/ethanolic solution of methacryloxypropyl trimethoxy silane to carry out surface modification to water-soluble polyvinyl alcohol fibers.
5. as claimed in claim 1 based on the temporary stall of vinal after surface modification to fracturing process, it is characterized in that: described step 2) in the length of modified vinal selected be 6 ~ 8mm.
6. as claimed in claim 1 based on the temporary stall of vinal after surface modification to fracturing process, it is characterized in that: described step 2) in the diameter of modified vinal selected be 10 μm.
7. the temporary stall based on vinal after surface modification as claimed in claim 1 is to fracturing process, it is characterized in that: described modified vinal is 1.2% relative to the mass fraction of proppant.
8. the temporary stall based on vinal after surface modification as claimed in claim 1 is to fracturing process, it is characterized in that: the volume fraction that described proppant accounts for fracturing working fluid is 30%.
9. as claimed in claim 1 based on the temporary stall of vinal after surface modification to fracturing process, it is characterized in that: described step 3) in the operational discharge capacity of active water be 0.4m
3/ min.
10. as claimed in claim 1 based on the temporary stall of vinal after surface modification to fracturing process, it is characterized in that: described step 5) in the operational discharge capacity of prepad fluid be 2.4m
3/ min.
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