CN105041287A - Fiber temporary plugging turnaround fracture method capable of improving low permeability tight sandstone oil and gas well production capacity - Google Patents
Fiber temporary plugging turnaround fracture method capable of improving low permeability tight sandstone oil and gas well production capacity Download PDFInfo
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- CN105041287A CN105041287A CN201510436124.9A CN201510436124A CN105041287A CN 105041287 A CN105041287 A CN 105041287A CN 201510436124 A CN201510436124 A CN 201510436124A CN 105041287 A CN105041287 A CN 105041287A
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Abstract
The invention relates to a fiber temporary plugging turnaround fracture method capable of improving low permeability tight sandstone oil and gas well production capacity, which comprises steps: 1 wells and layers which can carry out fiber temporary plugging turnaround fracture are selected; 2 perforation intervals and perforation parameters are selected; 3 fracture construction parameters and fracture construction pump sequence are optimized and determined; 4 fiber temporary plugging diversion agent addition, fiber addition speed in construction and crack turnaround plugging pressure are counted; 5 crack closing time, crack closing pressure and prepad fluid amount are simulated and counted; and 6 original cracks are plugged by utilizing fiber temporary plugging diversion agent, and are turned to fracture stage construction after being turned over. The fiber temporary plugging turnaround fracture method capable of improving the low permeability tight sandstone oil and gas well production capacity can be widely applied to improve fracture of low permeability tight sandstone multiple storage layer oil and gas wells, and improves reforestation effect of storage layers by counting software simulation, optimizing fracture construction parameters and increasing fibers. Compared with prior art, the fiber temporary plugging turnaround fracture method capable of improving low permeability tight sandstone oil and gas well production capacity has low construction cost, strong controllability and excellent pressure effect, and is 2-4 time of adjacent well productivity.
Description
Technical field
The invention belongs to well fracturing technical field, be specifically related to a kind of temporary stall of fiber improving Low permeability and competent sand Oil & Gas Productivity to fracturing process, for old well refracturing transformation.
Background technology
Pressure break is low permeability reservoirs reservoir reconstruction, realizes the important channel of benefit exploitation, and temporary stall can improve the transformation volume of reservoir to fracturing technique, forms complicated seam net system, increases oil gas drainage area, realize well production increment object.
Conventional temporary stall is by injecting chemical temporary blocking agent in fracturing process to fracturing process, carries out blocking up temporarily in crack, forces crack to turn to extension.The chemical temporary blocking agent adopted mainly is divided into two kinds, and one is water-soluble diverting agent, and another kind adopts oil-soluble temporary plugging agent.Diverting agent mainly utilizes certain particle diameter to carry out hole and shouts interior accumulation, or forms filter cake by plastic operation, thus forms the stifled temporarily barrier layer that permeability is extremely low, resistance to compression degree is high, realizes the shutoff of fracture tip, makes crack turn to extension.
There are following 2 problems in existing fracturing process:
1, controllability is weak, thus makes the rising of fracture propagation pressure amplitude little, and crack turns to extension not obvious, is not easily formed and turns to crack to increase the rear oil gas drainage area of pressure;
2, stifled material can not be degradable temporarily, and significantly can not improve fracture condudtiviy, easy formation causes larger injury, or anti-pressure ability is inadequate, and crack is easily broken through, and the fracturing reform effect of increasing production improving Low permeability and competent sand reservoir is not obvious.
Summary of the invention
The object of the invention is the problems referred to above overcoming prior art, increase oil gas drainage area for Low permeability and competent sand Oil/gas Well reservoir reconstruction provides a kind of, improve the temporary stall of fiber of individual well frscturing effect to fracturing technique.
For this reason, the invention provides a kind of temporary stall of fiber improving Low permeability and competent sand Oil & Gas Productivity to fracturing process, comprise the following steps:
Step 1) according to individual well well logging, log data, reservoir stress data, the horizontal spread of sandstone and fracture intensity, judge, select to implement well and the layer that fiber blocks up turnaround fracture temporarily;
Step 2) according to individual well well logging, well logging geologic information selective perforation well section and perforating parameter;
Step 3) according to individual well geologic information and offset well Production development data, calculate in conjunction with frac software simulation, optimize and determine fracturing parameter and pressing crack construction pump sequence;
Step 4) according to optimizing fracturing parameter, fracture pattern analog parameter and the crack shutoff length determined, according to similarity criterion, the rock core stifled fracturing experiments data temporarily of application experiment room simulation, calculate that fiber in fiber stifled diversion agent addition, construction temporarily adds speed, crack turns to shutoff pressure;
Step 5) before formal pressing crack construction, can pressure break test be carried out, utilize termination of pumping pressure data to calculate fracture closure times and fracture closure pressure and preposition liquid measure by frac software simulation;
Step 6) utilize separate stratum fracfturing instrument to carry out individual layer sand fracturing transformation, in pressing crack construction, utilize fiber to block up diversion agent temporarily and shutoff is carried out to primary fissure seam, after crack is turned to, turnaround fracture staged construction.
Step 1) described in judgement can implement the fiber well of stifled turnaround fracture and layer temporarily, comprise following condition:
(1) the transformation maximum horizontal principal stress of sandstone reservoir and the stress difference of minimum horizontal principal stress are less than 9MPa;
(the average microcrack number of (2) transformation sandstone reservoir is every meter of reservoir thickness more than 0.8;
(3) transform sandstone reservoir brittleness index and be greater than 50;
(4) transform sandstone reservoir longitudinal thickness and be less than 10m;
(5) stress difference transforming the longitudinal upper mud stone barrier bed of sandstone reservoir and sandstone is greater than 8MPa, and mud stone barrier bed thickness is greater than 5m.
Step 2) in selective perforation well section be the position in portion on the lower, gas-bearing formation stage casing, perforation thickness is 2-4m.
Step 3) or step 4) described in fracturing parameter comprise proppant consumption, the filling of average proppant ratio, operational discharge capacity, fracturing fluid consumption,
Step 4) described fracture pattern analog parameter comprise transformation crack flow conductivity, fracture length, fracture height, crack width.
Described frac software is FracproPT software or E-StimPlan software or Meyer software.
Step 3) described in pressing crack construction pump sequence comprise the proppant concentration in each little stage of constructing and proppant consumption, fracturing fluid consumption, fiber stifled diversion agent filling time temporarily.
Step 6) in described pressing crack construction, adopt clean fracturing fluid as working fluid, according to step 5) in pressure break test the preposition liquid measure determined carry out prepad fluid make seam construct, adding proppant stage according to step 3) the construction pump sequence determined constructs, filling fiber temporarily stifled diversion agent carries out fracture tip shutoff, turnaround fracture staged construction is carried out after crack successfully turns to, and Real-Time Monitoring operation pressure, judge whether crack creates according to operation pressure change and turn to crack.
Whether described crack creates and turns to the determination methods in crack to be: after fiber temporarily stifled diversion agent filling, infusion is the stifled displacement fluid stage temporarily, observe operation pressure whether to go up fast, and rising pressure is greater than the stress difference of maximum horizontal principal stress and minimum level well main stress bar, if construction rising pressure is greater than this stress difference, then judge that primary fissure seam achieves shutoff, create and new turn to crack, then proceed turnaround fracture construction; Otherwise, continue mixing and inject fiber and proppant, carry out shutoff again.
Described fiber temporarily stifled diversion agent is DF-1 modified fibre.
The invention has the beneficial effects as follows: method technique is simple, convenient operation, construction effect are obvious, the fracturing reform of the how thin reservoir hydrocarbons well of Low permeability and competent sand can be widely used in, calculated by software simulation, can Optimum Fracturing construction parameter, fiber dosage, improve reservoir reconstruction effect.Compared with existing sand volume fracturing technique, have construction cost low, controllability is strong, and site operation is adjustable flexibly, effective after pressure, is 2-4 times of offset well production capacity.
Be described in further details below in conjunction with accompanying drawing.
Accompanying drawing explanation
Fig. 1 is the relation of fiber shutoff length and shutoff pressure;
Tu2Shi Soviet Union and Eastern Europe A Jing Shan
1the temporary stall of layer fiber is to hydraulic fracture operating curve figure;
Tu3Shi Soviet Union and Eastern Europe B Jing Shan
1the temporary stall of layer fiber is to hydraulic fracture operating curve figure.
Detailed description of the invention
Embodiment 1:
Present embodiments provide a kind of temporary stall of fiber improving Low permeability and competent sand gas well deliverability to fracturing process, comprise the following steps:
Step 1) according to individual well well logging, log data, reservoir stress data, the horizontal spread of reservoir sandstone and microcrack developmental state, judge to select to implement well and the layer that fiber blocks up turnaround fracture temporarily.
Wherein, judge to select to implement fiber temporarily the well of stifled turnaround fracture and layer meet the following conditions:
(1) the transformation maximum horizontal principal stress of sandstone reservoir and the stress difference of minimum horizontal principal stress are less than 9MPa;
(2) transform sandstone reservoir microcrack comparatively to grow, average microcrack number is greater than every meter of reservoir thickness 0.5;
(3) transform sandstone reservoir and have higher brittleness index, brittleness index is greater than 50;
(4) transform the longitudinal sand thickness of sandstone reservoir and be less than 15m;
(5) transform in sandstone reservoir longitudinal direction and have good obstruction conditions, namely the stress difference of mud stone barrier bed and sandstone is greater than 6MPa, and mud stone barrier bed thickness is greater than 5m.
Step 2) according to individual well well logging, well logging geologic information Optimum Perforation well section and perforating parameter.Optimum Perforation well section is the position in portion on the lower, gas-bearing formation stage casing, and Optimum Perforation thickness is 2-4m.
Step 3) according to individual well geologic information and offset well Production development data, calculate in conjunction with frac software simulation, optimize and determine fracturing parameter and pressing crack construction pump sequence.
Wherein, frac software used is FracproPT software or E-StimPlan software or Meyer software, optimizes the fracturing parameter determined and comprises proppant consumption, average proppant filling ratio, operational discharge capacity, fracturing fluid consumption; Pressing crack construction pump sequence comprises the proppant concentration in each little stage of constructing and proppant consumption, fracturing fluid consumption, fiber diverting agent filling time.
Step 4) turn to shutoff length according to optimizing fracturing parameter, fracture pattern analog parameter and the crack determined, according to similarity criterion, the rock core stifled fracturing experiments data temporarily of application experiment room simulation, calculate that fiber in fiber diverting agent addition, construction adds speed, crack turns to shutoff pressure.
And fracture pattern analog parameter comprises flow conductivity, fracture length, fracture height, the crack width in transformation crack.
Step 5) before formal pressing crack construction, carry out mini frac test, utilize termination of pumping pressure data to calculate fracture closure times and fracture closure pressure and preposition liquid measure by frac software simulation.
Wherein, frac software used is FracproPT software or E-StimPlan software or Meyer software.
Step 6) in main pressing crack construction, utilize fiber diverting agent to carry out shutoff to primary fissure seam, after crack being produced turn to, carry out turnaround fracture staged construction.
In pressing crack construction, adopt fracturing fluid with low damage as working fluid, according to step 5) middle-size and small-size pressure break test the preposition liquid measure determined carry out prepad fluid make seam construction, adding proppant stage according to step 3) the construction pump sequence determined constructs, filling fiber diverting agent carries out fracture tip shutoff, turnaround fracture staged construction is carried out after crack successfully turns to, and Real-Time Monitoring operation pressure, judge whether crack creates according to operation pressure change and turn to crack.
And whether crack creates and turns to the determination methods in crack to be: after the filling of fiber diverting agent, infusion is the stifled displacement fluid stage temporarily, observe operation pressure whether to go up fast, and rising pressure is greater than the stress difference of maximum horizontal principal stress and minimum level well main stress bar, if construction rising pressure is greater than this stress difference, then judge that primary fissure seam achieves shutoff, then proceed turnaround fracture construction; Otherwise, continue mixing and inject fiber and proppant, carry out shutoff again.Wherein, fiber diverting agent is the DF-1 modified fibre with degradable characteristic.
The temporary stall of fiber of this raising Low permeability and competent sand gas well deliverability provided by the invention is simple to fracturing process method technique, convenient operation, construction effect are obvious, the fracturing reform of the how thin reservoir gas well of Low permeability and competent sand can be widely used in, calculated by software simulation, can Optimum Fracturing construction parameter, fiber dosage, improve reservoir reconstruction effect.
Embodiment 2:
On the basis of embodiment 1, the present embodiment is for Soviet Union and Eastern Europe A well, this well is one breath field development well, typical Recover of Tight Sandstone Gas Reservoir many thin layers gas well, there are gas-bearing formation, gas-bearing bed, gassiness water layer totally 6 substratums, comprehensive this well surveying of analysis log data and block development situation, selection fractured interval is mountain
1gas-bearing formation.In order to effectively transform this well reservoir, design adopts the temporary stall of fiber to fracturing technology.
Concrete steps;
Step 1) evaluate this Jing Shan
1whether gas-bearing formation is applicable to fiber stifled turnaround fracture temporarily: this block mountain
1the average 6MPa of stress difference of layer maximum horizontal principal stress and minimum horizontal principal stress, block microcrack is comparatively grown, average microcrack number is 1.1/m, sandstone reservoir brittleness index is higher, for 50-60, reservoir longitudinal thickness 8m, mud stone barrier bed thickness is greater than 6m, with sand layers stress difference 11MPa, stress shielding is better.Overall merit is thought, this Jing Shan
1layer can adopt the temporary stall of fiber to carry out fracturing reform to fracturing technique.
Step 2) according to the well of selected applicable turnaround fracture and geologic information selective perforation well section and the perforating parameter such as well logging, well logging of layer.Optimizing this well perforated interval is 2974.0-2976.0m, and adopt SYD-102 perforating gun, 127 perforating bullet perforations, 60 °, perforation phase angle, shot density is 16 holes/m.
Step 3) carry out fracturing reform parameter optimization according to log data, completion interval of well body structure, offset well Production development situation, reservoir stress data, sandbody distribution situation, fracturing string adopts 2
7/
8" oil pipe band list seals fracturing tool, calculates in conjunction with frac software simulation, determine that the proppant consumption transforming interval is 30m
3, proppant mean concentration is 21%, operational discharge capacity is 2.4-3.0m
3/ min, fracturing fluid consumption are 362m
3and pressing crack construction pump sequence.When to add concentration be 30% to proppant, add fiber simultaneously and carry out crack and block up temporarily, adding fiber front support agent consumption is 13m
3, turning to crack to add proppant is 10m
3, application frac software simulation calculates fracture parameters, and the flow conductivity in crack is 37dc.cm, and fracture length is 150m, fracture height is 23m, crack width is 6mm, meets this well fracturing reform needs.
In the present embodiment, proppant type is 20-40 object high-strength low-density haydite, fracturing fluid is the clean fracturing liquid system of Low Damage, various clean fracturing fluid disclosed in prior art can be adopted, fiber blocks up diversion agent temporarily by DF-1 fibre modification, fiber main component is water-soluble poval, mean molecule quantity is 60000 ~ 150000, is the universal product on market.
Its method of modifying is as follows:
(1) adopt chromic acid solution to carry out surface modification to DF-1 fiber, treatment effect is relatively good, and treatment process is simple, and process is easy to control.Adopt orthogonal experiment, utilize the evaluation indexes such as weight-loss ratio, hydroscopicity and surface functional group content, draw optimal treatment condition: 1. chromic acid formula K
2cr
2o
7: dense H
2sO
4: H
2o adopts 5:8:100; 2. under room temperature condition, soak time is 2.5h; 3. 65 ~ 70 DEG C of condition lower processing times are about 4min.
(2) surface grafting method is adopted to have radiation initiation and chemistry initiation to the initiation method that DF-1 fiber carries out surfacing conventional.Adopt orthogonal experiment, utilize the evaluation indexes such as percent grafting, hydroscopicity and surface functional group content, draw optimal treatment condition: 1. KMnO
4concentration is 5 × 10
- 3mol/L, 2. H
2sO
4concentration is 0.2mol/L, 3. acrylic acid concentration be 0.8mol/L, 4. reaction time is 3.0h.
(3) silane coupler process.Utilize the evaluation indexes such as adsorption rate, hydroscopicity and percent grafting, draw the treatment conditions that each experiment is proper: the water/ethanolic solution process DF-1 fiber selecting methacryloxypropyl trimethoxy silane DF-1A-503, to its modifying surface, improve its hydroscopicity and dispersiveness.
DF-1 modified fibre has the feature of scattered, automatic degraded, and contributes to outstanding sand, can improve the laid efficiency of proppant in crack, can prevent fracturing fluid recovery (backflow) initial stage proppant backflow, improve the flow conductivity in crack; Evaluate by experiment, select the diameter of DF-1 modified fibre to be 10 microns, length is 8 millimeter; When pressing crack construction, add the high sand ratio stage of sand, fiber and proppant are mixed together and add.Specifically, add the proppant high sand ratio stage in the main pressure break stage exactly, utilize ground charging (feeding) equipment that DF-1 modified fibre is sucked pressure break fracturing blender truck blending tank fast, by ground fracturing pump truck, DF-1 modified fibre is pumped in well together with proppant haydite.
Fiber shutoff length is got by experimental evaluation, as shown in Figure 1, have rated operational discharge capacity 3m
3/ min, sand, than 20%, stitches high 30m, stitches wide 5mm, the relation curve of shutoff fracture length and shutoff pressure, and as seen from the figure, during shutoff length 0.4m, shutoff pressure 11MPa, can meet the requirement that crack turns to shutoff.
Step 4) according to optimizing fracturing parameter, the fracture pattern analog parameter determined: operational discharge capacity, proppant concentration, crack width, fracture height, and crack shutoff length, according to similarity criterion, the rock core stifled fracturing experiments data temporarily of application experiment room simulation, add parameter to fiber and be optimized calculating, Optimal Parameters mainly comprises: fiber dosage, fiber add speed, shutoff pressure.
If lab simulation chinks temporarily, length is L
1, width is W
1, be highly H
1, in crack, flow velocity is V
1, the shutoff pressure that fiber and proppant are formed is F
1, breakthrough pressure P
1, discharge capacity Q
1; Under reservoir condition, the fiber length that chinks temporarily is L
2, width is W
2, be highly H
2, in crack, flow velocity is V
2, the shutoff pressure that fiber and proppant are formed is F
2, breakthrough pressure P
2, discharge capacity Q
2.Based on fluid similarity principle in crack, that accurate number-newton number Ne sets up Similarity equations to applications similar is as follows:
Wherein
F
1＝P
1W
1H
1
F
2＝P
2W
2H
2
Substitute into F
1, F
2, V
1, V
2, can obtain:
Then shutoff pressure △ P
2similarity equations be:
The experimentally experimental data of room simulation, the optimal proportion that adds obtaining fiber is 12 ‰, and proppant volume density is 1760kg/m
3, then the dosage ratio of fiber is 21.1kg/m
3.
The addition calculating fiber is:
X＝W
2×H
2×L
2×21.1/1000
The speed that adds of fiber is:
In above formula:
L
1-lab simulation chinks length temporarily, cm;
W
1-lab simulation chinks width temporarily, mm;
H
1-lab simulation chinks highly temporarily, mm;
V
1fracturing fluid flow velocity in-lab simulation crack, ml/min;
F
1the shutoff pressure that-lab simulation fiber and proppant are formed, N;
P
1-lab simulation breaks through fiber shutoff pressure, MPa;
△ P
1-lab simulation crack shutoff pressure, MPa;
Q
1-lab simulation fracturing fluid injects discharge capacity, ml/min;
L
2-reservoir condition chinks length temporarily, m;
W
2-reservoir condition chinks width temporarily, mm;
H
2-reservoir condition chinks highly temporarily, m;
V
2fracturing fluid flow velocity in-reservoir condition crack, m
3/ min;
F
2the shutoff pressure that-reservoir condition fiber and proppant are formed, N;
P
2-reservoir condition breaks through fiber shutoff pressure, MPa;
Q
2-reservoir condition operational discharge capacity, m
3/ min;
△ P
2-lab simulation crack shutoff pressure, MPa;
X-fiber addition, kg;
Y-fiber adds the stage and adds sand amount, m
3;
R-fiber adds the stage and adds sand sand ratio;
V-fiber adds speed, kg/min;
Get one group of experimental data, Q
1for 10ml/min, L
1for 5.0cm, H
1for 8.2mm, W
1for 0.067mm, △ P
1for 2.6MPa.Reservoir condition fracturing operational discharge capacity Q
2for 3.0m
3/ min, simulation fracture length L
2for 150m, H
2for 14m, W
2for 7mm, calculate △ P
2equal 11.8MPa.
Fiber adds and supports dosage 7m adding of stage
3, add sand sand than 30%, calculate fiber dosage 172.5kg, fiber add speed 22.2kg/min, shutoff pressure 11.8MPa, infusion displacement fluid 26m after fiber is stifled temporarily
3, then infusion turns to prepad fluid 27m
3after, start to turn to crack to add proppant.
The design of pressing crack construction pump sequence is as follows:
1. mini-frac infusion program is in table 1 (asking for crosslinked guanidine glue fluid efficiency and formation closure pressure):
Table 1 pressure break test infusion program
2. main pressure break infusion program in table 2 (according to site operation situation, determine whether carry out newly stitch the main pressure break stage, until crack smoothly temporarily stall to, can perform according to design infusion program and newly stitch the pressure break stage):
Table 2 main pressing crack construction infusion program
Step 5) before formal pressing crack construction, carry out pressure break test, testing and analysis data is as shown in table 3, fracture closure times is at about 21min, clossing pressure is 45.0MPa, and G-function curve is typical standard filtration model, and crosslinked guanidine glue fluid efficiency is 55.1%, calculated by FracproPT software simulation, main pressure break stage preposition liquid measure is adjusted to 45m
3.
Table 3 pressure break Measurement results
Step 6) main hydraulic fracture operating curve as shown in Figure 2, test the preposition liquid measure 45m determined according to pressure break
3carry out making seam, master adds proppant stage and performs according to main pressing crack construction pump sequence, adds proppant 12m
3carry out first time fiber to block up temporarily, after adding fiber diversion agent 140kg with 14kg/min, operation pressure raises not obvious, performs construction sequence three, carry out second time fiber to block up temporarily, after adding fiber diversion agent 180kg with 23kg/min, operation pressure rises to 51MPa by 42MPa, and amount of increase has exceeded the mean stress difference 6.4MPa of block maximum horizontal principal stress and minimum level well main stress bar, block up successfully temporarily, turn to crack to add proppant 8m
3, this Jing Shan
1the temporary stall of layer fiber succeeds to pressing crack construction, adds up to add proppant 30m
3, add up to add fiber diversion agent 320kg.
After this well pressure break, fracturing fluid recovery (backflow) is rapid, and the row of returning leads and reaches 86%, and in discharge opeing process, proppant backflow phenomenon does not appear in gas well, and test open-flow capacity is 12.98 × 10
4m
3/ d is 3.5 times of offset well production capacity.
Embodiment 3:
On the basis of embodiment 1, the present embodiment is for Soviet Union and Eastern Europe B well, and this well is one breath field development well, typical Low permeability and competent sand gas-bearing formation many thin layers gas well, and this well Optimizing Reconstruction interval, selects mountain
1, box
8 timesadopt mechanical type fixed tubular column dividing potential drop to transform two sections, this well of overall merit geologic information, think this mountain, down-hole portion
1interval can implement the temporary stall of fiber to fracturing technology.
This Jing Shan
1as shown in Figure 3, operational discharge capacity is 3.0-3.4m to section construction curve
3/ min, carries out first crack after prepad fluid presses off stratum and adds sand, add proppant 10m
3after, carry out first time fiber to block up temporarily, fiber diversion agent 30kg is added with 15kg/min, pressure is uprushed as 54MPa from 48MPa, carries out second time fiber and block up temporarily after replacement, adds fiber diversion agent 160kg with 22.8kg/min, pressure moment increases to 53MPa from 43MPa, temporarily stifled effect is the most outstanding, carries out fiber low concentration 2.3kg/min afterwards and takes sand and to stumble note, add 40kg altogether.This well completes pressing crack construction smoothly, mountain
1layer is accumulative adds proppant 32m
3, add up to add fiber diversion agent 230kg.
Show according to the microseism of on-the-spot down-hole and ground potential method monitoring result, this well transformation mountain
1layer fracture network length is 168m, and width is 46m, be highly 21m, and fracture network trend becomes 45 ° by east for 91 °, north by east transfers to, the fracturing fracture length of monitoring, height with design and press the fracture length of rear matching, highly have good accordance.
After this well pressure break, the discharge opeing cycle is short, and finally the row of returning leads is 83%, in discharge opeing process, does not occur proppant backflow phenomenon, and test open-flow capacity is 6.12 × 10
4m
3/ d is 2.4 times of offset well production capacity.
The present invention scene application 5 implication wells, average gas testing open-flow capacity is 7.62 × 10
4m
3/ d is 2.8 times of identical reservoir geology condition offset well gas testing output, fracturing reform obvious effect of increasing production.
The work progress that the present embodiment does not describe in detail belongs to the known of the industry or common technology, does not describe one by one here.
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.
Claims (10)
1. the temporary stall of fiber improving Low permeability and competent sand Oil & Gas Productivity, to a fracturing process, is characterized in that, comprises the following steps:
Step 1) according to individual well well logging, log data, reservoir stress data, the horizontal spread of sandstone and fracture intensity, judge, select to implement well and the layer that fiber blocks up turnaround fracture temporarily;
Step 2) according to individual well well logging, well logging geologic information selective perforation well section and perforating parameter;
Step 3) according to individual well geologic information and offset well Production development data, calculate in conjunction with frac software simulation, optimize and determine fracturing parameter and pressing crack construction pump sequence;
Step 4) according to optimizing fracturing parameter, fracture pattern analog parameter and the crack shutoff length determined, according to similarity criterion, the rock core stifled fracturing experiments data temporarily of application experiment room simulation, calculate that fiber in fiber stifled diversion agent addition, construction temporarily adds speed, crack turns to shutoff pressure;
Step 5) before formal pressing crack construction, can pressure break test be carried out, utilize termination of pumping pressure data to calculate fracture closure times and fracture closure pressure and preposition liquid measure by frac software simulation;
Step 6) utilize separate stratum fracfturing instrument to carry out individual layer sand fracturing transformation, in pressing crack construction, utilize fiber to block up diversion agent temporarily and shutoff is carried out to primary fissure seam, after crack is turned to, turnaround fracture staged construction.
2. a kind of temporary stall of fiber improving Low permeability and competent sand Oil & Gas Productivity according to claim 1 is to fracturing process, it is characterized in that: step 1) described in judgement can implement the fiber well of stifled turnaround fracture and layer temporarily, comprise following condition:
(1) the transformation maximum horizontal principal stress of sandstone reservoir and the stress difference of minimum horizontal principal stress are less than 9MPa;
(2) transforming the average microcrack number of sandstone reservoir is every meter of reservoir thickness more than 0.8;
(3) transform sandstone reservoir brittleness index and be greater than 50;
(4) transform sandstone reservoir longitudinal thickness and be less than 10m;
(5) stress difference transforming the longitudinal upper mud stone barrier bed of sandstone reservoir and sandstone is greater than 8MPa, and mud stone barrier bed thickness is greater than 5m.
3. a kind of temporary stall of fiber improving Low permeability and competent sand Oil & Gas Productivity according to claim 1 is to fracturing process, it is characterized in that: step 2) in selective perforation well section be the position in portion on the lower, gas-bearing formation stage casing, perforation thickness is 2-4m.
4. a kind of temporary stall of fiber improving Low permeability and competent sand Oil & Gas Productivity according to claim 1 is to fracturing process, it is characterized in that: step 3) or step 4) described in fracturing parameter comprise proppant consumption, average proppant filling ratio, operational discharge capacity, fracturing fluid consumption.
5. a kind of temporary stall of fiber improving Low permeability and competent sand Oil & Gas Productivity according to claim 1 is to fracturing process, it is characterized in that: step 4) described fracture pattern analog parameter comprises flow conductivity, fracture length, fracture height, the crack width in transformation crack.
6. a kind of temporary stall of fiber improving Low permeability and competent sand Oil & Gas Productivity according to claim 1 is to fracturing process, it is characterized in that: described frac software is FracproPT software or E-StimPlan software or Meyer software.
7. a kind of temporary stall of fiber improving Low permeability and competent sand Oil & Gas Productivity according to claim 1 is to fracturing process, it is characterized in that: step 3) described in pressing crack construction pump sequence comprise the proppant concentration in each stage of constructing and proppant consumption, fracturing fluid consumption, fiber stifled diversion agent filling time temporarily.
8. a kind of temporary stall of fiber improving Low permeability and competent sand Oil & Gas Productivity according to claim 1 is to fracturing process, it is characterized in that: step 6) in described pressing crack construction, adopt clean fracturing fluid as working fluid, according to step 5) in pressure break test the preposition liquid measure determined carry out prepad fluid make seam construct, adding proppant stage according to step 3) the construction pump sequence determined constructs, filling fiber temporarily stifled diversion agent carries out fracture tip shutoff, turnaround fracture staged construction is carried out after crack successfully turns to, and Real-Time Monitoring operation pressure, judge whether crack creates according to operation pressure change and turn to crack.
9. a kind of temporary stall of fiber improving Low permeability and competent sand Oil & Gas Productivity according to claim 8 is to fracturing process, it is characterized in that, whether described crack creates and turns to the determination methods in crack to be: after fiber temporarily stifled diversion agent filling, infusion is the stifled displacement fluid stage temporarily, observe operation pressure whether to go up fast, and rising pressure is greater than the stress difference of maximum horizontal principal stress and minimum level well main stress bar, if construction rising pressure is greater than this stress difference, then judge that primary fissure seam achieves shutoff, create and new turn to crack, then proceed turnaround fracture construction, otherwise, continue mixing and inject fiber and proppant, carry out shutoff again.
10. a kind of temporary stall of fiber improving Low permeability and competent sand Oil & Gas Productivity according to claim 1 is to fracturing process, it is characterized in that: described fiber temporarily stifled diversion agent is DF-1 modified fibre.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510436124.9A CN105041287B (en) | 2015-07-23 | 2015-07-23 | A kind of temporary stall of fiber for improving Low permeability and competent sand Oil ＆ Gas Productivity is to fracturing process |
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|---|---|---|---|
| CN201510436124.9A CN105041287B (en) | 2015-07-23 | 2015-07-23 | A kind of temporary stall of fiber for improving Low permeability and competent sand Oil ＆ Gas Productivity is to fracturing process |
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| CN108316915A (en) * | 2017-12-20 | 2018-07-24 | 北京石油化工学院 | A kind of method that the optimal dosage of diversion agent is temporarily blocked up in determining oil/gas well compact reservoir |
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| CN109098707A (en) * | 2017-06-21 | 2018-12-28 | 中国石油化工股份有限公司 | The straight well seam network pressure cracking method of Adaptability Evaluation Method, sand-conglomerate body oil reservoir that the straight well seam network pressure of sand-conglomerate body oil reservoir is split |
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