CN1601052A - Method of integral throughput in multiple wells for extracting thick oil - Google Patents
Method of integral throughput in multiple wells for extracting thick oil Download PDFInfo
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Abstract
The invention is a method for multi-well cyclic steam stimulation thickened oil recovery by thermal recovery-steam injection technique, selecting: oil-layer depth in oil reservoir<1800m, residual oil saturation > 0.40, total oil-layer thickness > 5.0m, net-total thickness ratio >0.4, oil-layer porosity >0.15, and permeation rate variation coefficient <0.8; placing adjacent steam channeling wells and steam channeled wells (above two) together in the same group, simultaneously making steam injection in the well drainage sequence or block cluster well sequence, where steam injection strength of single well is 50-200 cu m/m and the well-bottom dryness fraction is greater than 50%, then stewing them, and finally opening them for production in the same sequence as above-mentioned. It can prevent steam channeling and interference between wells, effectively supplements pressure energy to oil layers and helps enlarge the steam spread range, and can increase the oil-layer pressure by about 2MPa as compared with single well steam stimulation method. It can both increase single-well output and prolong the life of steam stimulation.
Description
Technical field
The present invention relates to oil exploitation, is to adopt the thermal recovery steam injection technology to carry out the method that many wells integral body is handled up heavy crude producing.
Background technology
Steam soak is a kind of periodically steam in jection in oil well, improves the production technique of heavy oil production by effects such as heating viscosity reduction, de-pluggings.The output that adopts cyclic steam stimulation process to produce viscous crude in oil exploitation accounts for 80% of heavy crude heat extraction total output.At present, the cyclic steam stimulation of employing is that object carries out with the individual well, and the practice of a large amount of individual well steam soak shows and since not will around well do as a wholely to consider that organically interference phenomenon is more between well.Reason by its formation mainly contains two kinds, and the one, because reservoir heterogeneity causes.For example there is high infiltration ribbon oil reservoir, when steam soak is annotated vapour, the vapor absorption capacity difference of each layer, steam entry profile is seriously inhomogeneous, steam in jection is along the channelling of height infiltration band, form the fingering channelling, the fingering passage is gradually to contiguous low-pressure area producing well expansion, and steam and the hot water contiguous producing well of advancing by leaps and bounds finally takes place; Another type is when cyclic steam stimulation, injection pressure is too high the steam soak initial stage often, inject by force in fracture pressure or more than the fracture pressure (particularly special super-heavy oil deposit), injection rate is excessive, cause formation fracturing, stratum horizontal fracture or high permeability zone that steam in jection is induced by high pressure break through to offset well.Problems such as the pressure energy of the steam that the steam soak middle and later periods often produces that vapour is scurried, disturb, inject between well and heat energy utilization rate are low are unfavorable for slowing down the decline of formation pressure and well yield, are unfavorable for prolonging the life-span of handling up and producing.
Summary of the invention
The purpose of this invention is to provide in a kind of solution cyclic steam stimulation process that vapour is scurried, disturb between well, prolong the cyclic steam stimulation life-span, improve the method that many wells integral body of steam soak recovery ratio is handled up heavy crude producing.
For realizing the present invention, adopt following technical scheme:
Just steam soak or desire drop into cyclic steam stimulation, viscosity of crude carries out the handle up method of exploitation of many wells integral body greater than the heavy crude reservoir of 100mPa.s under the reservoir temperature;
Selected heavy crude reservoir meets the following conditions: reservoir depth＜1800m, remaining oil saturation＞0.40, oil reservoir gross thickness＞5.0m, clean gross thickness ratio＞0.4, oil reservoir degree of porosity＞0.15, coefficient of permeability variation＜0.8;
Adjacent vapour more than 2 mouthfuls is scurried well and scurried well to being placed on same group, annotate vapour simultaneously by well array order or block well group order, it is 50～200m that individual well is annotated vapour intensity
3/ m, the shaft bottom steam quality is greater than 50%, and stewing then well is pressed well array order or block well group order opening well and making production again.
For realizing that the present invention also adopts following technical scheme:
The opening well and making production order can intersect with the order of annotating vapour or be reversed.
First round is handled up and can be intersected with the order of a back round or be reversed in proper order.
The individual well steam injection rate is 200-300m
3/ d, the shaft bottom steam quality was boiled in a covered pot over a slow fire well 3-7 days greater than 40%.
Vapour is scurried well and scurried the grouping of well can be according to the geologic feature and the condition of production, or adopts the well array order to combine definite in proper order with the block well group in conjunction with numerical simulation result.
Effect of the present invention is as follows:
1) can prevent between well that vapour is scurried and well between disturb, replenish the pressure energy of oil reservoir effectively, and help to enlarge steam and involve scope, formation pressure is than single well stimulation about 2Mpa that can rise.Not only can improve well yield but also can prolong the life-span of handling up.
2) well integral body is handled up and is carried out in order, the order quadrature of round or reverse, and step-down direction and seepage direction can change front and back, thereby promote driving of remaining oil to sweep.
3) many wells integral body is handled up and both can be improved the effect of handling up, and the well group that drives for suitable vapour has been created to change and driven condition again, and it is the good transition that well group vapour drives.
The present invention can solve the problem of the weak effect of handling up, and improves the effect of cyclic steam stimulation, prolongs the cyclic steam stimulation life-span, improves the steam soak recovery ratio, improves the cyclic steam stimulation economic benefit.
The present invention's result of the test at the scene is as follows:
1,090,000 tons of trial zone oils in place, oil reservoir buried depth 800m, core intersection 41m, oil saturation 60-70%, degree of porosity 27%, permeability 1.06 darcies, viscosity of crude 168150mPa.s under 50 ℃ of temperature.At the 7th all after date of handling up, owing to adopted the whole steam soak of many wells, individual well cycle oil production does not descend by original decline curve, rise to some extent on the contrary, individual well cycle oil production is by 784 tons of 1108 tons of rising to the 9th cycle of handling up in the 7th cycle of handling up, and produces gas oil ratio and also be improved, and rises to the 9th 0.52 ton of the cycle of handling up by the 7th 0.40 of the cycle of handling up, improve the steam soak development effectiveness significantly, seen Fig. 1.Fig. 1 production per cycle change curve dotted line of handling up is a predicted value, and solid line is an actual value.
The invention description of drawings
Fig. 1 is the invention process production per cycle change curve design sketch of handling up.
Fig. 2 annotates for the embodiment of the invention 1 and adopts precedence diagram.
The B arrow is depicted as gas injection direction order among the figure, and the A arrow is an oil recovery direction order, and round spot is an oil well, identical numbering be same group (dotted line connection), the gas injection group is 1,2,3 in proper order, the oil recovery group is 3,2,1.
Fig. 3 annotates for the embodiment of the invention 2 and adopts precedence diagram.
The B arrow is depicted as gas injection direction order among the figure, and the A arrow is an oil recovery direction order, and round spot is an oil well, and gas injection group (dotted line connection) direction order intersects 90 degree with oil recovery group (chain-dotted line) direction.
Fig. 4 annotates for the embodiment of the invention 3 and adopts precedence diagram.
The B arrow is depicted as gas injection direction order among the figure, and the A arrow is an oil recovery direction order, and round spot is an oil well, and gas injection group (dotted line connection) direction order intersects 45 degree with oil recovery group (chain-dotted line) direction.
Fig. 5 annotates for the embodiment of the invention 3 and adopts precedence diagram.
The B arrow is depicted as gas injection direction order among the figure, and the A arrow is an oil recovery direction order, and round spot is an oil well, gas injection group (dotted line connections) direction in proper order with the oil recovery prescription to identical.
Inventive embodiments
When cyclic steam stimulation, have that adjacent several mouthfuls of well generation vapour are scurried, disturb between well, or offset well production fluid amount increases, the production fluid temperature raises, the moisture phenomenon that rises significantly, and many wells integral body heavy crude producing technology of handling up is annotated some steam-stimulated wells vapour (steam or steam+nitrogen), stewing well and then opening well and making production in an orderly manner exactly in an orderly manner.
1) according to oil field geologic feature and exploitation present situation, carries out coarse screening.This oil reservoir meets the following conditions: reservoir depth＜1800m, remaining oil saturation＞0.40, oil reservoir gross thickness＞5.0m, clean gross thickness ratio＞0.4, oil reservoir degree of porosity＞0.15, coefficient of permeability variation＜0.8;
2) utilize the well pattern of existing array pitch 167m, well spacing 98m,, select 5 mouthfuls of wells on the row as one group according to oil field gas injection capacity of equipment and oil reservoir feature, the well of will handling up grouping, each is organized well and annotates vapour by the alignment preface;
3) one group of notes vapour well is annotated vapour, stewing well, production simultaneously, and the individual well steam injection rate is 225m
3/ d, the shaft bottom steam quality was boiled in a covered pot over a slow fire well 3-5 days greater than 50%.
On present basis, can improve recovery percent of reserves 3.0%, gas oil ratio can reach more than 0.20.
Embodiment 2
Oil field 2 reservoir buried depths are at 500-800m, and effective pay thickiness is 30.0m, and clean gross thickness ratio is 0.5, average pore is 35%, mean permeability 1500md, coefficient of permeability variation 0.7, crude oil severe is 13API under the reservoir condition, and initial oil saturation is 60%.The exploitation of individual well steam soak has been adopted in the oil field, and vapour is scurried seriously, and well yield descends very fast, and recovery percent of reserves is low.
1) according to oil field geologic feature and exploitation present situation, carries out coarse screening.This oil reservoir meets the following conditions: reservoir depth＜1800m, remaining oil saturation＞0.40, oil reservoir gross thickness＞5.0m, clean gross thickness ratio＞0.4, oil reservoir degree of porosity＞0.15, coefficient of permeability variation＜0.8;
2) utilize the well pattern of existing well spacing 70m, according to oil field gas injection capacity of equipment and oil reservoir feature, 3 mouthfuls of adjacent between selection wells are as one group, the well of will handling up grouping, and each is organized well and annotates vapour by the alignment preface;
3) one group of notes vapour well is annotated vapour, stewing well, production simultaneously, and the individual well steam injection rate is 250m
3/ d, the shaft bottom steam quality was boiled in a covered pot over a slow fire well 3-5 days greater than 50%.
Implement the former annual decline rate 2% in back and stop substantially, well yield doubles, and the accumulation gas oil ratio can reach more than 0.50.
1) according to oil field geologic feature and exploitation present situation, carries out coarse screening.This oil reservoir meets the following conditions: reservoir depth＜1800m, remaining oil saturation＞0.40, oil reservoir gross thickness＞5.0m, clean gross thickness ratio＞0.4, oil reservoir degree of porosity＞0.15, coefficient of permeability variation＜0.8;
2) utilize the well pattern of existing well spacing 100m,, select 3 mouthfuls of adjacent wells as one group according to oil field gas injection capacity of equipment and oil reservoir feature, the well of will handling up grouping, each is organized well and annotates vapour by the alignment preface;
3) one group of notes vapour well is annotated vapour, stewing well, production simultaneously, and the individual well steam injection rate is 200-300m
3/ d, the shaft bottom steam quality was boiled in a covered pot over a slow fire well 3-7 days greater than 40%.
Implement 20 times, cover 149 mouthfuls of wells, incremental oil production 3.2 * 10
4T, gas oil ratio reaches more than 0.50.
The heavy crude reservoir that the present invention can be just drops into cyclic steam stimulation in steam soak or desire carries out, and can utilize the fast grouping in existing district well pattern, according to the oil field gas injection capacity of equipment, refers to the steam heating boiler maximum pump discharge, generally can annotate vapour for simultaneously 4-6 mouth well at present.
Group well order can be preferably definite according to the oil field actual conditions, can be by the sequential packet of well array order, block well group order or other form.Annotate the order of vapour, stewing well, production and can and produce current intelligence, determine preferably that in conjunction with results of numerical simulation principle is that adjacent vapour is scurried well and scurried well to being placed in same group, annotates vapour and production simultaneously according to the oil field geologic feature.Therefore this order and the concrete oil reservoir generation vapour well position of scurrying is relevant, it can be the order of well array order, well group order or other form, and different steam soak variable periods change the whole order of annotating vapour, stewing well and opening well and making production of many wells, for different viscous crude fields, the order that many wells integral body is handled up is determined according to concrete optimal design.
The opening well and making production order can intersect with the order of annotating vapour or be reversed.
First round is handled up and can be intersected with the order of a back round or be reversed in proper order.
Vapour is scurried well and scurried the grouping of well can be according to the geologic feature and the condition of production, or adopts the well array order to combine definite in proper order with the block well group in conjunction with numerical simulation result.
Whole nitrogen and the high temperature foam agent steam soak technology of adding of many wells, the foam stream that interpolation nitrogen and high temperature foam agent form preferentially shutoff steam is scurried forward (FWD), enlarges the steam sweep area, plays the deep profile controlling effect.
Claims (5)
1, a kind of many wells integral body method of handling up heavy crude producing, just steam soak or desire drop into cyclic steam stimulation, viscosity of crude carries out the exploitation of handling up of many wells integral body greater than the heavy crude reservoir of 100mPa.s under the reservoir temperature, it is characterized in that: selected heavy crude reservoir meets the following conditions: reservoir depth＜1800m, remaining oil saturation＞0.40, oil reservoir gross thickness＞5.0m, clean gross thickness ratio＞0.4, oil reservoir degree of porosity＞0.15, coefficient of permeability variation＜0.8; Adjacent vapour more than 2 mouthfuls is scurried well and scurried well to being placed on same group, annotate vapour simultaneously by well array order or block well group order, it is 50～200m that individual well is annotated vapour intensity
3/ m, the shaft bottom steam quality is greater than 50%, and stewing then well is pressed well array order or block well group order opening well and making production again.
2, a kind of many wells integral body according to claim 1 method of handling up heavy crude producing is characterized in that: the opening well and making production order can intersect with the order of annotating vapour or be reversed.
3, a kind of many wells integral body according to claim 1 method of handling up heavy crude producing is characterized in that: first round order of handling up can intersect with the order of a back round or be reversed.
4, a kind of many wells integral body according to claim 1 method of handling up heavy crude producing, it is characterized in that: the individual well steam injection rate is 200-300m
3/ d, the shaft bottom steam quality was boiled in a covered pot over a slow fire well 3-7 days greater than 40%.
5, a kind of many wells integral body according to claim 1 method of handling up heavy crude producing, it is characterized in that: vapour is scurried well and scurried the grouping of well can be according to the geologic feature and the condition of production, or adopts the well array order to combine definite in proper order with the block well group in conjunction with numerical simulation result.
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101089362B (en) * | 2007-07-13 | 2010-04-07 | 中国石油天然气股份有限公司 | Improved steam oil production method |
| CN101807225A (en) * | 2010-04-07 | 2010-08-18 | 杨勤涛 | Thickened oil numerical reservoir simulation method and device |
| CN101852074A (en) * | 2010-05-27 | 2010-10-06 | 中国石油天然气股份有限公司 | Method and system for exploiting lamellar super-heavy oil deposit |
| RU2487233C1 (en) * | 2012-08-24 | 2013-07-10 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Oil deposit development method |
| CN103256034A (en) * | 2013-01-23 | 2013-08-21 | 于文英 | Two important methods for improving steam stimulation effect |
| CN104500012A (en) * | 2014-11-24 | 2015-04-08 | 中国石油天然气股份有限公司 | SAGD starting method for interlayer heterogeneous thickened oil pool |
| CN104747155A (en) * | 2015-03-05 | 2015-07-01 | 中国石油天然气股份有限公司 | Heavy oil reservoir steam development method |
| CN105625990A (en) * | 2014-10-30 | 2016-06-01 | 中国石油化工股份有限公司 | Method for mining shale oil by virtue of horizontal well through performing volume fracturing on reservoirs |
| CN106246152A (en) * | 2016-08-18 | 2016-12-21 | 中国石油天然气股份有限公司 | Complex fault block heavy crude reservoir is handled up steam injection parameter optimization method |
| CN108019194A (en) * | 2016-11-02 | 2018-05-11 | 中国石油化工股份有限公司 | The method that more well linkage steam injections improve development result of heavy oil reservoirs |
| CN109653717A (en) * | 2019-01-23 | 2019-04-19 | 中国石油化工股份有限公司 | Combination, which is handled up, after individual well steam stimulation wells selects well decision-making technique |
| CN110159237A (en) * | 2019-06-10 | 2019-08-23 | 中国石油大学(华东) | A method of it is whole to adjust stifled heavy oil reservoir with edge and bottom water water enchroachment (invasion) and channeling |
| CN111520118A (en) * | 2020-06-12 | 2020-08-11 | 西南石油大学 | Recyclable heavy oil recovery method and system for heating injected solvent underground |
| CN111749658A (en) * | 2019-03-29 | 2020-10-09 | 中国石油天然气股份有限公司 | Carbon dioxide huff and puff oil production method and device |
| CN112145140A (en) * | 2019-06-28 | 2020-12-29 | 中国石油化工股份有限公司 | Gas injection method in thermal recovery process |
| CN113586041A (en) * | 2020-04-30 | 2021-11-02 | 中国石油天然气股份有限公司 | Method for generating steam distribution plan of heavy oil well |
| CN113653475A (en) * | 2021-09-18 | 2021-11-16 | 中国石油大学(华东) | Treatment and utilization method of foam gas-displacement channel |
| CN114753817A (en) * | 2021-01-08 | 2022-07-15 | 中国石油天然气股份有限公司 | Multi-well carbon dioxide huff-puff mining method and gas injection and production device |
| CN116927734A (en) * | 2023-09-19 | 2023-10-24 | 新疆新易通石油科技有限公司 | Method for improving exploitation efficiency of oil reservoir microorganism cold level |
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2003
- 2003-09-27 CN CN 03134880 patent/CN1601052A/en active Pending
Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101089362B (en) * | 2007-07-13 | 2010-04-07 | 中国石油天然气股份有限公司 | Improved steam oil production method |
| CN101807225A (en) * | 2010-04-07 | 2010-08-18 | 杨勤涛 | Thickened oil numerical reservoir simulation method and device |
| CN101852074A (en) * | 2010-05-27 | 2010-10-06 | 中国石油天然气股份有限公司 | Method and system for exploiting lamellar super-heavy oil deposit |
| CN101852074B (en) * | 2010-05-27 | 2013-02-13 | 中国石油天然气股份有限公司 | Method and system for exploiting lamellar super-heavy oil deposit |
| RU2487233C1 (en) * | 2012-08-24 | 2013-07-10 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Oil deposit development method |
| CN105283631A (en) * | 2013-01-23 | 2016-01-27 | 于文英 | Two important methods for enhancing steam injection effect |
| CN103256034A (en) * | 2013-01-23 | 2013-08-21 | 于文英 | Two important methods for improving steam stimulation effect |
| CN105625990A (en) * | 2014-10-30 | 2016-06-01 | 中国石油化工股份有限公司 | Method for mining shale oil by virtue of horizontal well through performing volume fracturing on reservoirs |
| CN105625990B (en) * | 2014-10-30 | 2018-07-17 | 中国石油化工股份有限公司 | A kind of method of volume fracturing horizontal wells shale oil |
| CN104500012A (en) * | 2014-11-24 | 2015-04-08 | 中国石油天然气股份有限公司 | SAGD starting method for interlayer heterogeneous thickened oil pool |
| CN104747155A (en) * | 2015-03-05 | 2015-07-01 | 中国石油天然气股份有限公司 | Heavy oil reservoir steam development method |
| CN106246152A (en) * | 2016-08-18 | 2016-12-21 | 中国石油天然气股份有限公司 | Complex fault block heavy crude reservoir is handled up steam injection parameter optimization method |
| CN106246152B (en) * | 2016-08-18 | 2019-01-18 | 中国石油天然气股份有限公司 | Complex fault block heavy crude reservoir is handled up steam injection parameter optimization method |
| CN108019194A (en) * | 2016-11-02 | 2018-05-11 | 中国石油化工股份有限公司 | The method that more well linkage steam injections improve development result of heavy oil reservoirs |
| CN109653717A (en) * | 2019-01-23 | 2019-04-19 | 中国石油化工股份有限公司 | Combination, which is handled up, after individual well steam stimulation wells selects well decision-making technique |
| CN111749658A (en) * | 2019-03-29 | 2020-10-09 | 中国石油天然气股份有限公司 | Carbon dioxide huff and puff oil production method and device |
| CN111749658B (en) * | 2019-03-29 | 2022-07-05 | 中国石油天然气股份有限公司 | Carbon dioxide huff and puff oil production method and device |
| CN110159237A (en) * | 2019-06-10 | 2019-08-23 | 中国石油大学(华东) | A method of it is whole to adjust stifled heavy oil reservoir with edge and bottom water water enchroachment (invasion) and channeling |
| CN110159237B (en) * | 2019-06-10 | 2020-05-15 | 中国石油大学(华东) | Method for integrally regulating water invasion and steam channeling of edge-bottom water heavy oil reservoir |
| CN112145140A (en) * | 2019-06-28 | 2020-12-29 | 中国石油化工股份有限公司 | Gas injection method in thermal recovery process |
| CN112145140B (en) * | 2019-06-28 | 2022-12-02 | 中国石油化工股份有限公司 | Gas injection method for thermal recovery process |
| CN113586041B (en) * | 2020-04-30 | 2023-12-26 | 中国石油天然气股份有限公司 | Method for generating steam distribution plan of thick oil well |
| CN113586041A (en) * | 2020-04-30 | 2021-11-02 | 中国石油天然气股份有限公司 | Method for generating steam distribution plan of heavy oil well |
| CN111520118B (en) * | 2020-06-12 | 2022-09-13 | 西南石油大学 | Recyclable heavy oil recovery method and system for heating injected solvent underground |
| CN111520118A (en) * | 2020-06-12 | 2020-08-11 | 西南石油大学 | Recyclable heavy oil recovery method and system for heating injected solvent underground |
| CN114753817A (en) * | 2021-01-08 | 2022-07-15 | 中国石油天然气股份有限公司 | Multi-well carbon dioxide huff-puff mining method and gas injection and production device |
| CN113653475A (en) * | 2021-09-18 | 2021-11-16 | 中国石油大学(华东) | Treatment and utilization method of foam gas-displacement channel |
| CN116927734A (en) * | 2023-09-19 | 2023-10-24 | 新疆新易通石油科技有限公司 | Method for improving exploitation efficiency of oil reservoir microorganism cold level |
| CN116927734B (en) * | 2023-09-19 | 2023-12-15 | 新疆新易通石油科技有限公司 | Method for improving exploitation efficiency of oil reservoir microorganism cold level |
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