CN106869887A - A kind of method of offshore oilfield combustion in situ exploitation - Google Patents
A kind of method of offshore oilfield combustion in situ exploitation Download PDFInfo
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- CN106869887A CN106869887A CN201710140413.3A CN201710140413A CN106869887A CN 106869887 A CN106869887 A CN 106869887A CN 201710140413 A CN201710140413 A CN 201710140413A CN 106869887 A CN106869887 A CN 106869887A
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- well
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Classifications
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
-
- 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
Abstract
The present invention relates to a kind of method of offshore oilfield combustion in situ exploitation, it is characterised in that：Using the well type well pattern of the linear well pattern of horizontal well, i.e., using horizontal injection well and horizontal production well procession formula displacement；Wherein, determinant displacement refers to that injection-production well arrangement relation is that row's producing well is spaced with row's injection well, and producing well is mutually corresponding with injection well.The present invention proposes the linear well pattern of horizontal well, and this carries out the well type well pattern of combustion in situ exploitation suitable for offshore oilfield, horizontal injection well is distributed in oil reservoir bottom, oil reservoir bottom is formed at the coke that oxidation reaction is formed more, can be effectively prevented from the unfavorable factor that air onlap is developed in conventional fireflood；Horizontal production well can preferably play flowable area's draining effect and the draining effect of steam.
Description
Technical field
The present invention relates to a kind of method of offshore oilfield combustion in situ exploitation, belong to oil development technical field.
Background technology
Combustion in situ is one of key technology of heavy crude heat extraction, and big rule have been carried out in countries such as Romania, India
Since the commercialization exploitation of mould, Eleventh Five-Year Plan, in Xinjiang of China oil field, Liaohe Oil Field etc., multiple block has successively carried out burning oil
Layer mining site pilot test, so far, 9.04 ten thousand tons of oil-producing has been tired out in the red shallow 1 wellblock fireflood pilot test of Xinjiang Oilfield, experiment
Important breakthrough is obtained, as the key technology such as fireflood is supporting and production management system are ripe day by day, fireflood is expected to turn into China thick
Oil reservoir improves the key technology of recovery percent of reserves.China's Bohai Bay Oil viscous crude aboundresources, but development degree is not high, crude oil extraction
Degree is relatively low, only carries out multielement hot fluid and steam soak pilot test in NB 35-2 oilfield, Luda 27-2 oil fields at present,
Combustion in situ is expected to turn into the exploitation sides such as the effective Simulation on whole pay zones mode of Offshore Heavy Oil Field oil reservoir and multielement hot fluid, steam soak
Formula takes over mode.However, generally turning the well pattern well of linear well pattern using straight well areal well pattern due to onshore oil field fireflood exploitation
Type, straight well Well Pattern And Spacing is small, individual well daily oil production is low, areal producing degree is uneven, it is impossible to meet offshore oil field development technology warp
Ji boundary, therefore, it is necessary to be directed to Offshore Heavy Oil Field oil reservoir fireflood exploitation correlation technique develop, to adapt to Offshore Heavy Oil Field thermal recovery
Exploitation is required.
The content of the invention
Regarding to the issue above, offshore oil field development requirement and recovery percent of reserves be disclosure satisfy that it is an object of the invention to provide one kind
The method of offshore oilfield combustion in situ exploitation higher.
To achieve the above object, the present invention uses following technical scheme：A kind of method of offshore oilfield combustion in situ exploitation,
It is characterized in that：Using the well type well pattern of the linear well pattern of horizontal well, i.e., using horizontal injection well and horizontal production well procession
Formula displacement；Wherein, determinant displacement refers to that injection-production well arrangement relation is that row's producing well is spaced with row's injection well, production
Well is mutually corresponding with injection well.
The gas injection speed of horizontal injection well is 9 × 104m3/ d, the note between horizontal injection well and adjacent horizontal production well
Well spacing is adopted for 250~300m, a length of 300m of the well of horizontal injection well and horizontal production well.
The air that horizontal injection well is injected is the normal air that oxygen content and nitrogen content are divided into 21% and 79%.
The sparking mode of combustion in situ is lighted a fire for electrical heating, and the duration of ignition is two months, and heating power is 2.55 × 108J/
d。
Due to taking above technical scheme, it has advantages below to the present invention：1st, the present invention proposes the linear well of horizontal well
Netting this carries out the well type well pattern of combustion in situ exploitation suitable for offshore oilfield, and horizontal injection well is distributed in oil reservoir bottom, oxidation
Oil reservoir bottom is formed at the coke for reacting formation more, can be effectively prevented from the unfavorable factor that air onlap is developed in conventional fireflood；
Horizontal production well can preferably play flowable area's draining effect and the draining effect of steam.2nd, side proposed by the invention
Method, verifies that it is adapted to opening for offshore oilfield wide spacing by the numerical simulation calculation of multiple oil reservoirs under different development schemes
Clockwork spring part, can meet the exploitation requirement of the few well high yield of offshore oilfield, no matter be developed as secondary oil recovery technology or as it
The substituted technique of its thermal recovery mode, can increase substantially recovery percent of reserves.
To combustion in situ, at sea developing for oil field provides important directive significance to the present invention.
Brief description of the drawings
Fig. 1 is the pattern diagram of different well type well patterns；Wherein figure (a) is straight well Five-point method pattern, and figure (b) is anti-straight well
9 method well patterns, figure (c) is the linear staggered well pattern of straight well, and figure (d) is straight well-horizontal well combination well pattern, and figure (e) is horizontal well line
Property well pattern；In figure,It is vertical gas injection well；Zero is vertical producing well；It is horizontal gas injection well；It is level
Producing well；
Fig. 2 is Luda 21-2 Wests Guantao IV oil group fireflood well site deployment figures；
Fig. 3 is Luda 21-2 oil fields West Guantao IV oil group fireflood exploitation annual production and tired production curve；
Fig. 4 is the western block fireflood well site deployment figure of NB 35-2 oilfield Nm05 sand bodies；Wherein, figure (a) is that 0 year well is developed in fireflood
Position deployment diagram；Figure (b) is that 5 years well site deployment figures are developed in fireflood；
Fig. 5 is NB 35-2 oilfield Nm05 sand bodies western block fireflood exploitation annual production and tired production curve；
Fig. 6 is to turn fireflood development wells deployment diagram after West Guantao IV oil in Luda 21-2 oil fields organizes steam soak；Wherein, scheme
A () is to turn to drive well site deployment figure after 4 cyclic steams are handled up；Figure (b) is to turn fireflood well site deployment figure after 8 cyclic steams are handled up；
Fig. 7 is that the different round steam soaks of Luda 21-2 Wests Guantao IV oil groups turn fireflood exploitation oil production curve.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
Term is explained：Combustion in situ, also known as fireflood, refer to light oil reservoir by artificial means, and in oil reservoir in a steady stream not
Air is injected disconnectedly, by the use of viscous crude heavy component as fuel, high-temperature oxydation leading edge is formed, and the viscosity of crude being heated constantly is reduced
And the flue gas produced by burning constantly drives and the process of output.
A kind of method of offshore oilfield combustion in situ exploitation proposed by the present invention, it is characterised in that：It is linear using horizontal well
The well type well pattern of well pattern, i.e., using horizontal injection well and horizontal production well procession formula displacement.Wherein, determinant displacement refers to
Injection-production well arrangement relation is that row's producing well is spaced with row's injection well, and producing well is mutually corresponding with injection well.
Further, the gas injection speed of horizontal injection well is 9 × 104m3/ d, horizontal injection well and adjacent horizontal production well
Between injector producer distance be 250~300m, a length of 300m of the well of horizontal injection well and horizontal production well.
Further, the air that horizontal injection well is injected is the mark that oxygen content and nitrogen content are divided into 21% and 79%
Quasi- air.
Further, light the mode of oil reservoir be electrical heating igniting, the duration of ignition be two months, heating power be 2.55 ×
108J/d。
Further, the method for offshore oilfield combustion in situ exploitation provided by the present invention, it is adaptable to still undeveloped oil
Tibetan carries out secondary oil recovery exploitation, and oil reservoir after being developed to steam soak or multielement hot fluid further exploitation is adopted with improving
Yield.
Below with the oil deposit parameter in several specific oil fields, the method using numerical simulation is entered to technique effect of the invention
Row checking：
Wherein, verification process is：
1) fine reservoir numerical simulation model is set up using Petrel softwares, CMG software STARS modules；
2) by mechanism model, the sensitivity analysis that different fireflood notes adopt parameter is made, provides fireflood exploitation note and adopt parameter；
3) by step 2) striked by fireflood note adopt parameter and be input into the model in 1), the production of prediction fireflood development phase is special
Levy.
Embodiment one：Different well pattern well type fireflood development effectiveness contrasts
By taking Luda 21-2 oil fields West Guantao V oil groups as an example, oil deposit parameter is shown in Table 1, respectively to straight well Five-point method pattern, straight
The anti-9 method well patterns of well, the linear staggered well pattern of straight well, straight well-horizontal well combination well pattern and the linear well pattern of horizontal well are burnt
Reservoir exploitation numerical Simulation Prediction, different well pattern pattern diagrams are as shown in Figure 1.
Analog result is as shown in table 2.Numerical simulation result shows that, using the linear well pattern of horizontal well, live wire responding time is most
Early, the tired oil production highest of stable production period individual well, air-oil ratio are minimum, and live wire fltting speed is most fast.Well type well pattern is developed in different fireflood
Under, the linear well pattern development effectiveness of horizontal well is optimal.
Luda 21-2 oil fields West Guantao V of table 1 oil group oil deposit parameter tables
Fireflood exploitation numerical simulation result contrast under the different well pattern patterns of Luda 21-2 Wests Guantao V of table 2 oil groups
Example two：The linear fireflood well pattern of horizontal well as secondary oil recovery application
Fireflood well site deployment sets up Careful Numerical Simulation model, first in Luda 21-2 Wests Guantao IV oil group heavy crude reservoirs
Phase disposes horizontal 4 mouthfuls of gas injection well, 4 mouthfuls of horizontal production well, as shown in Fig. 2 injector producer distance 300m, horizontal well 300m long, individual well note
Gas velocity rate 7 × 104m310 years indexs are developed in/d, numerical Simulation Prediction fireflood.
Analog result can reach 8.0 × 10 as shown in figure 3, the tired oil production of average individual well is developed in the fireflood of year ends 104m3, put down
Equal air-oil ratio 1996m3/m3, average individual well daily oil production 21.9m3, possess the production feature of typical fireflood exploitation.From individual well
Tired oil production and average air oil carry out fireflood development effectiveness preferable than from the point of view of using the linear well pattern of horizontal well.
Example three：The application in oil field of the linear well pattern of horizontal well after multielement hot fluid is developed
Fireflood well site deployment is in the NB 35-2 oilfield western block of Nm05 sand bodies, and oil deposit parameter is as shown in table 3.Set up fine numerical value
Simulation model, disposes 7 mouthfuls of horizontal gas injection well, 7 mouthfuls of horizontal production well in advance, and fireflood closes original annotation gas well, original production after developing 5 years
Well switchs to gas injection well, new to bore 7 mouthfuls of producing well, as shown in figure 4, injector producer distance 300m, horizontal well 300m long, individual well gas injection speed 9
×104m3/d.10 years indexs are developed in numerical Simulation Prediction fireflood.
The western block oil deposit parameter table of NB 35-2 oilfield Nm05 sand bodies of table 3
Analog result can reach 7.3 × 10 as shown in figure 5, the tired oil production of average individual well is developed in the fireflood of year ends 104m3, put down
Equal air-oil ratio 1472m3/m3, average individual well daily oil production 20m3, the life of typical fireflood exploitation is provided with before and after production-injection well conversion
Produce feature.From the tired oil production of individual well and average air oil than from the point of view of, after multielement hot fluid is developed, oil reservoir moisture percentage increases,
Can not only realize that wide spacing is developed using the linear well pattern of horizontal well, the development scheme for taking over formula, and contribute to secondary water body
Wet combustion is formed, the oil displacement efficiency of fireflood exploitation is improved.
Example four：The application in oil field of the linear well pattern of horizontal well after steam soak is developed
Fireflood well site deployment sets up Careful Numerical Simulation model in Luda 21-2 oil fields Guantao IV oil groups.Respectively to steam
Handle up 4 cycles of exploitation, turn after 8 cycles to drive an exploitation and carry out index prediction.4 cycles turned fireflood and retain 3 mouthfuls of water on the basis of former well location
Flat gas injection well, 3 mouthfuls of horizontal production wells；8 cycles turned fireflood and retain 5 mouthfuls of horizontal flat gas injection wells of saliva, 5 mouthfuls of water on the basis of former well location to produce all one's life
Well, well site deployment are as shown in fig. 6, average injector producer distance 250m, horizontal well 300m long, individual well gas injection speed 9 × 104m3/d.Numerical value
Simulation is handled up two kinds of differences and turns the index of fireflood exploitation after round and be predicted respectively.
Analog result develops the tired oil production difference of average individual well as shown in fig. 7, turning fireflood after the round of steam soak 4,8 rounds
It is 3.2 × 104m3、4.1×104m3, average air oil ratio respectively 2589m3/m3, 1909m3/m3, average individual well daily oil production point
Wei not 15.0m3、21.8m3, individual well daily oil production is 2.0 times, 3.2 times of steam soak exploitation, turns fireflood development effectiveness notable.
Meanwhile, fireflood exploitation is turned using the linear well pattern of horizontal well and possesses the productive prospecting that typical fireflood is developed, compare onshore oil field and handle up
After turn to drive developing example, using the linear well pattern of horizontal well, it is possible to achieve wide spacing is developed, and individual well daily oil production is higher；Using big
Well spacing is developed, and reservoir pressure significantly gos up, and secondary water body forms wet combustion, improves the oil displacement efficiency of fireflood exploitation.
The various embodiments described above are merely to illustrate the present invention, and wherein implementation steps of method etc. all can be what is be varied from,
Every equivalents carried out on the basis of technical solution of the present invention and improvement, should not exclude in protection scope of the present invention
Outside.
Claims (4)
1. a kind of method that offshore oilfield combustion in situ is developed, it is characterised in that：Using the well type well pattern of the linear well pattern of horizontal well,
Use horizontal injection well and horizontal production well procession formula displacement；Wherein, determinant displacement refers to injection-production well arrangement relation
For row's producing well is spaced with row's injection well, producing well is mutually corresponding with injection well.
2. the method that a kind of offshore oilfield combustion in situ as claimed in claim 1 is developed, it is characterised in that：Horizontal injection well
Gas injection speed is 9 × 104m3/ d, the injector producer distance between horizontal injection well and adjacent horizontal production well is 250~300m, water
The a length of 300m of well of flat injection well and horizontal production well.
3. the method that a kind of offshore oilfield combustion in situ as claimed in claim 1 is developed, it is characterised in that：Horizontal injection well institute
The air of injection is the normal air that oxygen content and nitrogen content are divided into 21% and 79%.
4. the method that a kind of offshore oilfield combustion in situ as claimed in claim 1 is developed, it is characterised in that：The point of combustion in situ
Fiery mode is lighted a fire for electrical heating, and the duration of ignition is two months, and heating power is 2.55 × 108J/d。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108035703A (en) * | 2017-11-27 | 2018-05-15 | 中国石油天然气股份有限公司 | Alternative expression steam drive development method and steam drive development well pattern structure |
| CN114592847A (en) * | 2020-12-07 | 2022-06-07 | 中国石油化工股份有限公司 | Thick-layer oil reservoir heavy oil development method based on combustion-assisted gravity drainage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108035703A (en) * | 2017-11-27 | 2018-05-15 | 中国石油天然气股份有限公司 | Alternative expression steam drive development method and steam drive development well pattern structure |
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| CN114592847A (en) * | 2020-12-07 | 2022-06-07 | 中国石油化工股份有限公司 | Thick-layer oil reservoir heavy oil development method based on combustion-assisted gravity drainage |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Applicant after: China Offshore Oil Group Co., Ltd. Applicant after: CNOOC research institute limited liability company Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Applicant before: China National Offshore Oil Corporation Applicant before: CNOOC Research Institute |
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