CN105952432B - A kind of quasi- natural energy of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well develops the well-arranging procedure that interlocks - Google Patents
A kind of quasi- natural energy of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well develops the well-arranging procedure that interlocks Download PDFInfo
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- CN105952432B CN105952432B CN201610363232.2A CN201610363232A CN105952432B CN 105952432 B CN105952432 B CN 105952432B CN 201610363232 A CN201610363232 A CN 201610363232A CN 105952432 B CN105952432 B CN 105952432B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
The present invention provides a kind of quasi- natural energy exploitation of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well, staggeredly well-arranging procedure, its step include：1) integrated geological interpretation is carried out first, preferred levels Jing Jingwangbushuqu, carries out reservoir classification and evaluation, determines that the main force contributes interval；2) optimization of horizontal section length；3) optimization of well spacing；4) pressure-break it is intersegmental away from optimization；5) array pitch is determined.The natural energy draining effect that horizontal well volume fracturing can be stitched net by the present invention performs to the limit, has evaded the water breakthrough risk of waterflooding extraction, and volume fracturing stagnant liquid plays the role of supplement energy at initial stage.
Description
Technical field
The present invention relates to oil field development mode technical field, more particularly to compact oil reservoir uses the side in horizontal well development oil field
Method, is specifically a kind of quasi- natural energy exploitation of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well staggeredly well-arranging procedure, is that one kind carries
The development scheme of high oil field individual well yield and development benefit.
Background technology
With the gradual scarcity to become increasingly conspicuous with high-quality petroleum resources of world oil imbalance between supply and demand, the fine and close oil money of Oil in Super-low Permeability
The exploitation in source (ground level air infiltration rate is less than 1.0mD) has become the new problem of China Petroleum development, both at home and abroad fine and close oil
Hide production practices and have shown that horizontal well is a kind of effective exploitation mode for developing such oil reservoir.External compact oil reservoir strata pressure
Coefficient is high (reservoir pressure coefficient is more than 1.2), and oil viscosity is relatively low, is all opened substantially using long horizontal sections horizontal well exhaustion formula
Adopt, although well yield is greatly improved, there is also big and recovery ratio (5%-8%) of successively decreasing it is relatively low the problem of；The country causes
Close oil and external fine and close oil phase ratio, similarity is that reservoir properties approach, anisotropism is strong, intrinsic fracture all comparative developments, poor
Different part is that reservoir pressure coefficient is low (between 0.6-0.8), from the point of view of the practice of Ordos Basin oil reservoir mining site, such
Low pressure ultra-low penetration compact oil reservoir need to supplement energy level well development.
From the point of view of the situation of literature survey, water injection well water filling is used in Oil in Super-low Permeability compact reservoir horizontal well energy supplement mode
Supplement, but show from Ordos Basin Oil in Super-low Permeability compact oil reservoir development Experience, the compact reservoir of the opposite development in crack, due to
Fracturing reform scale is big, and pressure-break net complex distribution, easily leads to waterflooding extraction horizontal well water breakthrough.Fine and close oil volume fracturing reform shape
Into complicated seam net system, be on the one hand conducive to expand drainage volume, supplement stratum energy, improve single well productivity, make horizontal well
Keep stable yields；But then since volume fracturing transformation scale is big, pressure-break net complex distribution, easily leads to waterflooding extraction level
Well water breakthrough, larger difficulty is caused to well pattern with matching for seam net.Therefore, ground in reservoir characteristic and volume fracturing horizontal well feature
On the basis of studying carefully, the development scheme of the quasi- natural energy of reservoir volume pressure break horizontal well suitable for fracture development is formed.
Theory based on factory operation and to fractured horizontal well job analysis, horizontal well " batch production " fracturing work thinking
Using cluster horizontal well well group as core, to solve water blanket for water as key, significantly shorten the horizontal well formation testing cycle, reduction is opened
Send out cost.Form the staggeredly well-arranging procedure of the quasi- natural energy of reservoir volume pressure break horizontal well suitable for fracture development.
The content of the invention
The purpose of the present invention is overcoming above-mentioned problems of the prior art, for the fine and close oil storage of the opposite development in crack
Layer, waterflooding extraction water breakthrough risk are big；In the case where improving well yield, reserves exploitation degree is improved.Give full play to body at the same time
The draining effect of fracture network is overstock, horizontal well region is all covered by pressure-break net, proposes a kind of Oil in Super-low Permeability compact oil reservoir volume pressure
Split the quasi- natural energy exploitation of horizontal well staggeredly well-arranging procedure.
For this reason, the present invention provides a kind of quasi- natural energy of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well to develop the cloth that interlocks
Well method, includes the following steps：
1) layer of sand isogram, oil reservoir isogram, porosity isopleth map, permeability isogram are drawn first,
Show that the region of high level carries out horizontal well patterns deployment in this four classes figure, carry out reservoir classification and evaluation, determine that the main force contributes interval；
2) optimization of horizontal section length
Using method for numerical simulation, reservoir uniform soft soil base is established, the single well productivity simulated under varying level segment length determines
Horizontal well length during internal rate of return (IRR) highest.
3) optimization of well spacing
(1) it is preferred according to fracturing technology
The design level well well spacing in the case where forming effectively seam net between ensuring horizontal well, according to fine and close oil volume pressure-break
Net monitoring result determines the well spacing of horizontal well.
(2) it is preferred according to Production development
Synthesis of the volume fracturing horizontal productivity by reservoir properties, fracturing reform scale, well pattern form, horizontal section length etc.
Influence, using the horizontal well Production development situation under daily output liquid this parameter comparison difference well spacing,
Wherein, ground liquid measure/discharge capacity × 1000 are entered depending on daily output liquid=daily output liquid/pressure break hop count/single hop
The fracture length transformed in combination with volume fracturing, determines the well spacing of rational horizontal well；
4) pressure-break it is intersegmental away from optimization
According to the different production times regard daily output liquid with it is intersegmental away from Production development, regarding after operation initial stage, half a year and 1 year
Daily output liquid determine when reaching maximum it is rationally intersegmental away from.
5) array pitch is determined
From plane, the pressure-break spacing of upper and lower two mouthfuls of water horizontal well joining place horizontal well transformation is defined as array pitch, will press
Crack it is intersegmental away from array pitch is considered as, determine rational array pitch.
Above-mentioned steps 1) specifically comprise the following steps：
1. with reference to sedimentary microfacies map, diagenesis phasor and porosity, permeability figure, the highest area of porosity and connectivity value is selected
The largest regional deployment horizontal well patterns of domain, remaining non-producing reserves；
2. selective perforation interval operation yield is higher than the oil layer section of 2t/d, interval, the brill as horizontal well are contributed for the main force
Meet interval.
Above-mentioned steps 2) in, the design length of the horizontal well is 800m~1000m.
Above-mentioned steps 3) in, the well spacing of the horizontal well is 550-650m.
Above-mentioned steps 3) in, the well spacing of the horizontal well is specially 600m.
Above-mentioned steps 4) in, it is identified rationally intersegmental away from the range of 80-100m.
Above-mentioned steps 4) in, it is identified rationally intersegmental away from for 90m.
Above-mentioned steps 5) in, the rational array pitch is in the range of 80-100m.
Above-mentioned steps 5) in, the rational array pitch is specifically identified as 90m.
Well spacing is half long 2 times of artificial fracture between above-mentioned horizontal well.
Beneficial effects of the present invention：The fine and close oily reservoir of the opposite development in crack, horizontal well are staggered, staggeredly cloth seam, by water
The natural energy draining effect of horizontal well volume fracturing seam net performs to the limit.The water breakthrough risk of waterflooding extraction, volume pressure are evaded
Split stagnant liquid and play the role of supplement energy at initial stage.It can realize that same oil reservoir bores 4 mouthfuls of water horizontal wells on a well site, into
Row factory operation.
The present invention is described in further details below with reference to attached drawing.
Brief description of the drawings
Fig. 1 is quasi- natural energy well pattern and inscape schematic diagram；
Fig. 2 is cluster drilling schematic diagram.
Description of reference numerals：1st, horizontal section length；2nd, well spacing；3rd, fracture spacing；4th, array pitch；5th, well site position.
Embodiment
It is accurate to a kind of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well provided by the invention natural with reference to Fig. 1 and Fig. 2
Staggeredly well-arranging procedure is described in detail for energy exploitation.
Wherein the method for well net optimization design and basic principle are：First, integrated application reservoir engineering, numerical simulation and ore deposit
The methods of field statistics, while consider technical indicator and economic indicator；Second, the ability of extensive volume fracturing can be played, significantly
Degree improves well yield.Applicable elements：The fine and close oily reservoir of the opposite development in crack.
The present invention has taken into full account the fine and close oily reservoir of the opposite development in crack, by carrying out integrated geological interpretation and ultra-low penetration
Compact oil reservoir non linear fluid flow through porous medium mechanism study, on the basis of analysis and summary horizontal well difference well pattern implementation result over the years, innovation carries
Having gone out the quasi- natural energy exploitation of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well, staggeredly well-arranging procedure, the present invention use：
(1) horizontal well is staggered, and well spacing is half long 2 times of artificial fracture between horizontal well, realizes two horizontal wells
Between realize seam net all standing, volume fracturing transformation man-made fracture with open intrinsic fracture be interweaved, staggeredly cloth stitch,
Seam net all covers horizontal well cloth wellblock, at utmost plays the draining effect of seam net.
(2) natural energy develop, by volume fracturing enter ground liquid measure it is big, a large amount of stagnant liquids are still suffered from after the row of returning in stratum,
Stratum energy is supplemented to a certain extent, plays the role of Advance Water Injection.
(3) be conducive to carry out cluster drilling, based on cluster drilling, form central water supply, alternately pressure break, concentrate pressure break
The horizontal well factory operation pattern of liquids recovery, significantly investment reduction cost, increases economic efficiency.
(4) combine the quasi- natural energy development process of horizontal well volume fracturing can be divided into stable yields at initial stage, successively decrease it is very fast and steady
Surely successively decrease the Development Practices of three phases, it is determined that different phase oil recovery technique policy.
Wherein the design length of horizontal well is 800m~1000m, and the well spacing of horizontal well is 600m；It is rationally intersegmental away from for 90m
Left and right.
As shown in drawings, Fig. 1 shows quasi- natural energy horizontal well patterns and inscape schematic diagram；
Fig. 2 shows cluster drilling schematic diagram；Wherein：1-horizontal section length, 2-well spacing, 3-fracture spacing (crack section
Spacing), 4-array pitch, 5-well site position.
1) layer of sand isogram, oil reservoir isogram, porosity isopleth map, permeability isogram are drawn first,
Show that the region of high level carries out horizontal well patterns deployment in this four classes figure, carry out reservoir classification and evaluation, determine that the main force contributes interval；
1. with reference to sedimentary microfacies map, diagenesis phasor and porosity, permeability figure, the highest area of porosity and connectivity value is selected
The largest regional deployment horizontal well patterns of domain, remaining non-producing reserves；
2. according to the Production development of directional well, operation yield in perforated zone is higher than the oil layer section of 2t/d, and layer is contributed for the main force
Section, the brill as horizontal well meet interval.
2) optimization of horizontal section length 1
Using method for numerical simulation, reservoir uniform soft soil base is established, simulates the single well productivity under varying level segment length, according to
Analog result can be seen that under quasi- natural energy exploit condition, and horizontal section length is longer, and single well productivity is higher, but horizontal segment
Length is longer to mean that scale of investment is larger, integrated economics benefit evaluation result can be seen that horizontal section length for 800m~
During 1000m, internal rate of return (IRR) highest.In view of a variety of limitations of site contour landforms, with reference to numerical simulation and economic evaluation
Conclusion, the reasonable length for determining quasi- natural energy development level section are 800~1000m.
3) optimization of well spacing 2
(1) it is preferred according to fracturing technology
Horizontal Well away from design must assure that effectively seam net is formed between horizontal well.And fine and close oil volume pressure-break net monitoring
The result shows that：Fracture half-length reaches more than 300m, the nearly 100m of fracture width after volume fracturing.In consideration of it, determine long horizontal sections five
Point Well Pattern And Spacing is 600m.
(2) it is preferred according to Production development
Synthesis of the volume fracturing horizontal productivity by reservoir properties, fracturing reform scale, well pattern form, horizontal section length etc.
Influence, utilize the horizontal well Production development situation under daily output liquid this parameter comparison difference well spacing.
Enter ground liquid measure/discharge capacity × 1000 depending on daily output liquid=daily output liquid/pressure break hop count/single hop
Volume fracturing transformation scale and horizontal section length are eliminated to production capacity depending on daily output liquid it can be seen from above formula
Influence, be conducive to contrast reservoir fluid supply capacity, preferably corresponding well pattern parameter.The fracture length transformed in combination with volume fracturing,
It is 600m to determine rational well spacing.
4) pressure-break it is intersegmental away from optimization
Daily output liquid is regarded according to the different production times under 83 wellblocks of peace length, the 7 quasi- natural energy development scheme of fine and close oil volume pressure break
With it is intersegmental away from Production development, after operation initial stage, half a year and 1 year regard daily output liquid all it is intersegmental away from as 90m when reach maximum,
Development effectiveness is best, it is thus determined that the long 7 fine and close quasi- natural energy exploitation volume fracturing horizontal wells of oil it is rationally intersegmental away from for 90m it is left
It is right.
5) array pitch 4
From plane, the pressure-break spacing of upper and lower two mouthfuls of water horizontal well joining place horizontal well transformation is defined as array pitch 4.Volume
The quasi- natural energy well pattern form seam net of pressure break horizontal well all covers horizontal well cloth wellblock, so array pitch 4 is equivalent to pressure-break
Intersegmental away from, rational array pitch is 90m or so.
Cluster drilling (Fig. 2) is required according to current drilling technology, before Horizontal Well Targets away from>260m, offset distance>200m, one
It can realize that same oil reservoir bores 4 mouthfuls of water horizontal wells on a well site, carry out factory operation.
Industrial practicality example
Using a kind of ultra-low penetration compact oil reservoir horizontal well well-arranging procedure acquired by the present invention in an Ordos Basin Ji
Grow 7 oil reservoirs and achieve preferable development effectiveness in plateau oil field.
Pacify 83 wellblocks length 72Belong to northeast sedimentary system, major developmental delta front sub-facies, 83 wellblock main layer length 7 of peace2 2
Sandbody distribution direction is reached by deposition phase control in east northeast-Nan Xi to spread, sandbody width about 14.0km, average sand thickness
17.0m, sand layer thickness is gradually thinning along main abrasive band to both sides, and individual layer sand thickness is relatively thin (generally 3~8m), multi depositional stages river
Road is stacked to form thick sand body.Main layer length 72 2Average core intersection 10m, average pore 8.9%, mean permeability 0.17mD.
For low hole, hypotonic lithological pool.
7 reservoir intrinsic fractures are grown in northern Shensi 83 wellblocks of peace relatively to develop, go into operation 115 mouthfuls of standards certainly using the well-arranging procedure of the present invention
Right energy development level well, initial stage, development effectiveness was preferable, individual well at initial stage day oil-producing 10.1t, and initial stage, rate of oil production 1.4%, average
Production 13 months, the accumulative oil-producing 1873t of well, development effectiveness are preferable.
6 mouthfuls of wells of factory operation well group are averaged shaft building 20.1 days, 22.3 days formation testing cycles, average level segment length 917m,
Reservoir-encountered rate 91.1%, transforms 9 section of 19 cluster, average individual well adding ceramic 554m3, sand is than 12.4%, discharge capacity 6.0m3/min；Just
Phase is averaged individual well day oil-producing 12.2t, and aqueous 35.6%；It is averaged at present individual well day oil-producing 6.7t, aqueous 42.5%.
The part for not having to describe in detail in present embodiment belongs to the known conventional means of the industry, does not chat one by one here
State.The foregoing examples are only illustrative of the present invention, does not form the limitation to protection scope of the present invention, every and sheet
The same or similar design is invented to belong within protection scope of the present invention.
Claims (10)
- The well-arranging procedure 1. a kind of quasi- natural energy exploitation of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well interlocks, it is characterised in that： Include the following steps：1) layer of sand isogram, oil reservoir isogram, porosity isopleth map, permeability isogram are drawn first, this four Show that the region of high level carries out horizontal well patterns deployment in class figure, carry out reservoir classification and evaluation, determine that the main force contributes interval；2) optimization of horizontal section lengthUsing method for numerical simulation, reservoir uniform soft soil base is established, the single well productivity simulated under varying level segment length determines inside Horizontal well length during earning rate highest；3) optimization of well spacing(1) well spacing of horizontal well is preferably determined in the case where forming seam net between ensuring horizontal well according to fracturing technology；(2) according to Production development preferably by the horizontal well Production development situation under daily output liquid this parameter comparison difference well spacing, Wherein, ground liquid measure/discharge capacity × 1000 are entered depending on daily output liquid=daily output liquid/pressure break hop count/single hopThe fracture length transformed in combination with volume fracturing, determines the well spacing of rational horizontal well；4) pressure-break it is intersegmental away from optimizationAccording to the different production times regard daily output liquid with it is intersegmental away from Production development, initial stage of going into operation, regard daily output after half a year and 1 year Liquid determined when reaching maximum rationally it is intersegmental away from；5) array pitch is determinedFrom plane, the pressure-break spacing of upper and lower two mouthfuls of water horizontal well joining place horizontal well transformation is defined as array pitch, and array pitch is regarded For the intersegmental away from determining rational array pitch of pressure-break.
- The well spacing 2. the quasi- natural energy exploitation of a kind of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well as claimed in claim 1 interlocks Method, it is characterised in that：Wherein step 1) specifically comprises the following steps：1. with reference to sedimentary microfacies map, diagenesis phasor and porosity, permeability figure, select the highest region of porosity and connectivity value, remain The largest regional deployment horizontal well patterns of remaining non-producing reserves；2. selective perforation interval operation yield is higher than the oil layer section of 2t/d, interval is contributed for the main force, the brill as horizontal well meets interval.
- The well spacing 3. the quasi- natural energy exploitation of a kind of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well as claimed in claim 1 interlocks Method, it is characterised in that：Wherein in step 2), the design length of the horizontal well is 800m~1000m.
- The well spacing 4. the quasi- natural energy exploitation of a kind of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well as claimed in claim 1 interlocks Method, it is characterised in that：In step 3), the well spacing of the horizontal well is 550-650m.
- The well spacing 5. the quasi- natural energy exploitation of a kind of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well as claimed in claim 4 interlocks Method, it is characterised in that：In step 3), the well spacing of the horizontal well is specially 600m.
- The well spacing 6. the quasi- natural energy exploitation of a kind of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well as claimed in claim 1 interlocks Method, it is characterised in that：It is identified rationally intersegmental away from the range of 80-100m in step 4).
- The well spacing 7. the quasi- natural energy exploitation of a kind of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well as claimed in claim 6 interlocks Method, it is characterised in that：It is identified rationally intersegmental away from for 90m in step 4).
- The well spacing 8. the quasi- natural energy exploitation of a kind of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well as claimed in claim 1 interlocks Method, it is characterised in that：In step 5), the rational array pitch is in the range of 80-100m.
- The well spacing 9. the quasi- natural energy exploitation of a kind of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well as claimed in claim 8 interlocks Method, it is characterised in that：In step 5), the rational array pitch is specifically identified as 90m.
- The cloth 10. the quasi- natural energy exploitation of a kind of Oil in Super-low Permeability compact oil reservoir volume fracturing horizontal well as claimed in claim 1 interlocks Well method, it is characterised in that：Well spacing is half long 2 times of artificial fracture wherein between horizontal well.
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| RU2788182C1 (en) * | 2022-01-31 | 2023-01-17 | Публичное акционерное общество "Татнефть" имени В.Д. Шашина | Method for developing oil deposits with low-permeability reservoirs |
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