CN107448185A - Offshore oilfield new well in old district encrypts well-arranging procedure - Google Patents
Offshore oilfield new well in old district encrypts well-arranging procedure Download PDFInfo
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- CN107448185A CN107448185A CN201610378802.5A CN201610378802A CN107448185A CN 107448185 A CN107448185 A CN 107448185A CN 201610378802 A CN201610378802 A CN 201610378802A CN 107448185 A CN107448185 A CN 107448185A
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0631—Resource planning, allocation, distributing or scheduling for enterprises or organisations
- G06Q10/06315—Needs-based resource requirements planning or analysis
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Mining
Abstract
The present invention provides a kind of offshore oilfield new well in old district encryption well-arranging procedure, and offshore oilfield new well in old district encryption well-arranging procedure includes：Step 1, the primiparity of single well of offshore oilfield economic limit, Single Well Economic limit control reserve are determined；Step 2, offshore oilfield economic and reasonable pattern density is determined；Step 3, it is determined that the subdivision of marine oil reservoir series of strata and combined method；Step 4, it is determined that marine oil reservoir well pattern form and rational spacing between wells；Step 5, according to earthquake, position of platform, the new well well location of digital-to-analogue complex optimum；Step 6, it is determined that new well layering, old well measure workload, improves the old and new's well parameter list.Offshore oilfield new well in old district encryption well-arranging procedure realizes that rate of oil production greatly improves, single well controlled reserves reduces, the further perfect good result of flooding pattern, achieves preferable economic benefit and social benefit.
Description
Technical field
The present invention relates to marine oil reservoir to improve recovery ratio and well location design field, and it is old to be related specifically to beach shallow sea oil field
New well encryption well-arranging procedure in area's structure adjusting exploitation.
Background technology
Offshore oil is ensconced in oil development and played an important role, and the marine chengdao oilfield of triumph is first that China is built up
Produce the pole shallow sea elephant of megaton per year, be the exploration practice first in Chinese pole shallow-water oilfield performance history, to similar oil field
Development ＆ construction there is important directive function.The oil field is located at Southern Bohai, and sea conditions are complicated, bad environments, belong to
Offshore marginal oilfield, have sand body cross directional variations big, produce and note water layer multiple, platform tubing string life-span limit, investment is high, risk is big
The features such as.
For the marine chengdao oilfield of high-speed and high-efficiency exploitation triumph, the recovery ratio in the platform term of validity is improved, it is necessary to right first
Oil reservoir is developed, reserves abundance is high, but the block that single well controlled reserves is big, single well productivity is low carries out comprehensive exploitation adjustment.And
, it is necessary to using new method during progress structure adjusting, individual well and well group reserves controlling extent and production capacity are improved as far as possible,
Individual well productivity effect and block recovery ratio are improved to greatest extent.For this, we have invented a kind of encryption of offshore oilfield new well in old district
Well-arranging procedure, solves above technical problem.
The content of the invention
It is an object of the invention to provide a kind of offshore oil that can effectively improve offshore platform term of validity intra block recovery ratio
Field new well in old district encryption well-arranging procedure.
The purpose of the present invention can be achieved by the following technical measures：Offshore oilfield new well in old district encrypts well-arranging procedure, should
Offshore oilfield new well in old district encryption well-arranging procedure includes：Step 1, the primiparity of single well of offshore oilfield economic limit, Single Well Economic are determined
Limit control reserve；Step 2, offshore oilfield economic and reasonable pattern density is determined；Step 3, it is determined that marine oil reservoir series of strata subdivision with
Combined method；Step 4, it is determined that marine oil reservoir well pattern form and rational spacing between wells；Step 5, it is comprehensive according to earthquake, position of platform, digital-to-analogue
Close and optimize new well well location；Step 6, it is determined that new well layering, old well measure workload, improves the old and new's well parameter list.
The purpose of the present invention can be also achieved by the following technical measures：
In step 1, the primiparity of single well of offshore oilfield economic limit refers to that under certain technology, economic condition oil well exists
The accumulation output value in investment payback time is equal to same period gross investment, accumulative annual running cost is used and necessary tax sum；Offshore oilfield
The determination method of Single Well Economic limit primiparity is, according to Profit and loss balance principle, when considering lapse rate in the evaluation phase and recovering the oil rate because
Element, dependency relation formula is established, so as to can determine that economic limit primiparity of the oil well under certain oil price；
The determination method of Single Well Economic limit control reserve is to consider marine technological level, productivity index at present, is established single
The relational expression of well economic limit control reserve and recovery percent of reserves, so as to can determine that economic limit control of the oil well under certain oil price
Reserves, relational expression are as follows：
1. Single Well Economic limit primiparity qi
2. Single Well Economic limit control reserve N
In formula：Id+Ib+Ie-- individual wells drilling well investment+individual well ground investment+individual well operation expense, 104$
O+TAX-- tons oil operating cost+ton oil sale tax , $/t
PO-- oil price , $/t
ER- recovery percent of reserves, %
R-- loan interest rates, %
T--- evaluates the time limit, year
DC-- evaluation phase lapse rate, %
τO-- rate during oil recovery, decimal
α -- crude oil commodity rate, %
β -- oil well coefficient.
In step 2, according to existing oil price, the value according to last a bite Encryption Well newly increased recoverable reserves is equal to this mouthful of well
Capital construction gross investment and in the investment payback time summation of operating cost principle, establish offshore oilfield economic and reasonable pattern density
Calculation formula, formula are as follows：
In formula：
ER--- ultimate recovery；
N--- producing well well spacing densities, well/km2；
K--- effective permeabilities, μm2；
μo--- crude oil underground viscosity, mPa.s；
Np--- the newly-increased economical rationality recoverable reserves of individual well, × 104t/well；
V--- per unit area reserves, × 104t/km2；
M--- individual well gross investments, Wan Yuan；
P--- individual well year production management expenses, Wan Yuan；
L--- crude oil prices, member/t；
N+1--- producing well reasonable well pattern densities, well/km2。
In step 3, according to actual geology characteristic, reservoir properties, fluid properties and the pressure system of offshore oilfield not
Together, according to will have similar reservoir physical property, fluid properties and driving type, and possess certain area and reserves, have one
Fixed reservoir thickness and the oil reservoir of 1-2 main layer, series of strata subdivision and the combined method of a set of series of strata are divided into, determines offshore oil
The series of strata subdivision of Tibetan and combining form.
In step 4, according to offshore oilfield in the platform term of validity, high_speed development as far as possible, the principle of recovery ratio is improved, together
When according to offshore oilfield oil reservoir development characteristicses, take into full account the other factor of existing old well well location and injection-production well, determine offshore oilfield well
Web form is based on five-spot pattern well network, according to economic and reasonable pattern density, determines offshore oilfield economic and reasonable well spacing.
In steps of 5, according to earthquake reflection case, and reservoir development situation and Well Pattern And Spacing are combined, it is determined that new well well location
And target position；New well exploitativeness is determined according to position of platform；It is accumulative within the evaluation phase by the new well of numerical Simulation Prediction
The output value, optimum results to the end are obtained, consider and determine new well well location.
In step 6, by new well well location, target coordinate and the oil-water well relation implemented, it is determined that new well layering, passes through
Predict that new well bores oil reservoir situation of meeting, plane note adopts the old well Production development of corresponding situation and surrounding, it is determined that new well perforation layer position with
Perforating degree, and make well design parameter list and be layered adjacent old well measure quantity sheet.
Offshore oilfield new well in old district encryption well-arranging procedure in the present invention, technical thought understands, using simple, solves sea
The problem of rate of oil production is low in the upper mounting plate term of validity, recovery ratio is low, the investment payback time is long, to realize that marine oil reservoir high-speed and high-efficiency is opened
Hair, raising recovery ratio provide practicable technical method.This method is in the marine chengdao oilfield main body shop epimere old area of triumph
Applied in oil reservoir structure adjusting, realize rate of oil production greatly improve, single well controlled reserves reduce, flooding pattern enter one
Perfect good result is walked, achieves preferable economic benefit and social benefit.
Brief description of the drawings
Fig. 1 is the flow chart that the offshore oilfield new well in old district of the present invention encrypts a specific embodiment of well-arranging procedure；
Fig. 2 is the Single Well Economic limit primiparity curve map under the conditions of different oil prices in a specific embodiment of the invention；
Fig. 3 is the Single Well Economic limit control reserve curve under the conditions of different oil prices in a specific embodiment of the invention
Figure；
Fig. 4 is the economic and reasonable pattern density curve map under the conditions of different oil prices in a specific embodiment of the invention；
Fig. 5 is five-spot pattern well network schematic diagram in a specific embodiment of the invention；
Fig. 6 is new well well location target spot Seismic reflection character schematic diagram in a specific embodiment of the invention；
Fig. 7 is well location schematic diagram after digital-to-analogue optimization in the specific embodiment of the present invention.
Embodiment
For enable the present invention above and other objects, features and advantages become apparent, it is cited below particularly go out preferable implementation
Example, and coordinate shown in accompanying drawing, it is described in detail below.
As shown in figure 1, Fig. 1, which is the offshore oilfield new well in old district of the present invention, encrypts the flow chart of well-arranging procedure.With the triumph field of razor clam
Exemplified by the block of island oil field main body shop epimere old area, new well in old district encryption well spacing is carried out using this method.
In step 101, the primiparity of single well of offshore oilfield economic limit, Single Well Economic limit control reserve are determined.The offshore oil
Field Single Well Economic limit primiparity refers under certain technology, economic condition, the accumulation output value of oil well within the investment payback time etc.
In same period gross investment, accumulative annual running cost is used and necessary tax sum；The determination method of the Single Well Economic limit primiparity is root
According to Profit and loss balance principle, the factor such as rate, establishes dependency relation formula, so as to can determine that oil when considering lapse rate in the evaluation phase and recovering the oil
Economic limit primiparity of the well under certain oil price.The determination method of the Single Well Economic limit control reserve is to consider sea at present
Technological level, productivity index etc., the relational expression of Single Well Economic limit control reserve and recovery percent of reserves is established, so as to can determine that oil well
Economic limit control reserve under certain oil price.Relational expression is as follows：
1. Single Well Economic limit primiparity
2. Single Well Economic limit control reserve
In formula：Id+Ib+Ie-- individual wells drilling well investment+individual well ground investment+individual well operation expense, 104$
O+TAX-- tons oil operating cost+ton oil sale tax , $/t
PO-- oil price , $/t
ER- recovery percent of reserves, %
R-- loan interest rates, %
T--- evaluates the time limit, year
DC-- evaluation phase lapse rate, %
τO-- rate during oil recovery, decimal
α -- crude oil commodity rate, %
β -- oil well coefficient.
In the embodiment, according to Profit and loss balance principle, the factor such as rate, passes through generation when considering lapse rate in the evaluation phase and recovering the oil
Enter dependency relation formula, so that it is determined that economic limit primiparity of the oil well under certain oil price.According to the warp of current marine chengdao oilfield
Ji evaluating and manufacturing parameter, and consider marine state of art at present, correlation formula is substituted into, calculates Guantao Formation Reservoir orientation
Well Single Well Economic limit control reserve, and calculate economic limit recoverable reserves and limit well spacing thickness.
As shown in Figure 2,3.The block 50 $ of oil price/bbl, 60 $/bbl, 70 $/bbl, 80 $/bbl, 90 $/bbl, 100 $/
Single Well Economic limit primiparity during bbl is respectively 35.9t/d, 28.3t/d, 23.6t/d, 20.5t/d, 18.5t/d, 16.9t/d,
Single Well Economic limit control reserve is respectively 21.7t, 16.5t, 13.2t, 11.0t, 9.5t, 8.2t.
In step 102, according to existing oil price, the value according to last a bite Encryption Well newly increased recoverable reserves is equal to this mouthful of well
Capital construction gross investment and in the investment payback time summation of operating cost principle, it is close to establish offshore oilfield economical rationality well pattern
Calculation formula is spent, formula is as follows：
In formula：
ER--- ultimate recovery；
N--- producing well well spacing densities, well/km2；
K--- effective permeabilities, μm2；
μo--- crude oil underground viscosity, mPa.s；
Np--- the newly-increased economical rationality recoverable reserves of individual well, × 104t/well；
V--- per unit area reserves, × 104t/km2；
M--- individual well gross investments, Wan Yuan；
P--- individual well year production management expenses, Wan Yuan；
L--- crude oil prices, member/t；
N+1--- producing well reasonable well pattern densities, well/km2。
By the way that economic parameters is substituted into above-mentioned formula, the offshore oilfield economical rationality well pattern that can obtain under different oil prices is close
Degree.
In this embodiment, according to the offshore oilfield economic and reasonable pattern density calculation formula of foundation, the block is calculated
Economic and reasonable pattern density (see Fig. 4) under different oil prices, while calculate corresponding economic and reasonable well spacing.
In step 103, according to actual geology characteristic, reservoir properties, fluid properties and the pressure system of offshore oilfield etc.
Difference, according to that will have similar reservoir physical property, fluid properties and driving type, and possess certain area and reserves, have
Certain reservoir thickness and the oil reservoir of 1-2 main layer, series of strata subdivision and the combined method of a set of series of strata are divided into, it is determined that marine
The series of strata subdivision of oil reservoir and combining form.
In this embodiment, according to actual geology characteristic, reservoir properties, fluid properties and pressure system of offshore oilfield etc.
Difference, according to series of strata subdivision and combined method, be 1 ∽, 4 sets of straticulate explorations typically by reservoir division, each straticulate exploration should have
Certain recoverable reserves, to ensure that adjustment Encryption Well has economic benefit；Under conditions of meeting that each series of strata have economic benefit,
Control individual well penetrates layers apart number, core intersection and permeability grade, and to reduce interlayer interference, that improves all kinds of oil reservoirs employs thickness；
The oil reservoir of oils water boundary, pressure system, sedimentation type and oil property relatively is combined in a set of straticulate exploration as far as possible.
The block is divided into 2 sets of series of strata, wherein Ng1+2, Ng3 is upper series of strata, and Ng4, Ng5 are lower series of strata.
In step 104, according to offshore oilfield in the platform term of validity, high_speed development as far as possible, the principle of recovery ratio is improved, together
When according to offshore oilfield oil reservoir development characteristicses, existing old well well location and the injection-production well factor such as not are taken into full account, it is determined that marine Cheng Dao
Oilfield well network form is based on five-spot pattern well network.According to economic and reasonable pattern density, determine that offshore oilfield economy is closed
Manage well spacing.
In this embodiment, according to reservoir development situation, consider with adjacent the effective of wellblock well pattern to be around connected as far as possible, with
And existing old well location puts fixed influence, Five-point method pattern is disposed；Further according to sand body developmental state and water out behavior, well is adjusted
Net, well location is specifically disposed, see Fig. 5.
In step 105, according to earthquake reflection case, and reservoir development situation and Well Pattern And Spacing are combined, it is determined that new well well location
And target position；New well exploitativeness is determined according to position of platform；It is accumulative within the evaluation phase by the new well of numerical Simulation Prediction
The output value, optimum results to the end are obtained, consider and determine new well well location.
In this embodiment, according to the distance and angle of new well and platform, and the anti-collision factor with existing old well is considered, really
Whether fixed new well can be implemented.Further according to seismic reflection axle inverting situation, and adjacent old well reservoir development situation around new well is combined,
Predict that the power, sand body vertical communication situation and sand body of new well target spot axis of reflection laterally bore chance situation, if meet that individual well bores and meet
The needs that thickness He Xinjing connects with old well sand body, so that it is determined that new well well location and target spot.Fig. 6 is the specific implementation of the present invention
Seismic cross-section in example, dq-023 are section of the analog track of new well in earthquake；It can be seen that this is new from seismic profile
Well is strong in the reflection of Ng42 layers, good with 251C-6 connectednesses, and 251C-6 is bored in the layer and met sand body 8.0m, thus judges that dq-023 wells store up
Layer physically well develops, so that it is determined that new well well location and target spot the layer position.By numerical simulation means, predict new well within the evaluation phase
Cumulative production, if meet Single Well Economic limit parameter requirement, so as to finally determine new well well location, see Fig. 7.
In step 106, by new well well location, target coordinate and the oil-water well relation implemented, it is determined that new well is layered, pass through
Predict that new well bores oil reservoir situation of meeting, plane note adopts old well Production development of corresponding situation and surrounding etc., it is determined that new well perforation layer position
And perforating degree, and make well design parameter list and be layered adjacent old well measure quantity sheet.
Claims (7)
1. offshore oilfield new well in old district encrypts well-arranging procedure, it is characterised in that the offshore oilfield new well in old district encrypts well-arranging procedure
Including：
Step 1, the primiparity of single well of offshore oilfield economic limit, Single Well Economic limit control reserve are determined；
Step 2, offshore oilfield economic and reasonable pattern density is determined；
Step 3, it is determined that the subdivision of marine oil reservoir series of strata and combined method；
Step 4, it is determined that marine oil reservoir well pattern form and rational spacing between wells；
Step 5, according to earthquake, position of platform, the new well well location of digital-to-analogue complex optimum；
Step 6, it is determined that new well layering, old well measure workload, improves the old and new's well parameter list.
2. offshore oilfield new well in old district according to claim 1 encrypts well-arranging procedure, it is characterised in that in step 1, sea
Upper oil field Single Well Economic limit primiparity refers to that under certain technology, economic condition accumulation of the oil well within the investment payback time is produced
Value is equal to same period gross investment, accumulative annual running cost is used and necessary tax sum；The primiparity of single well of offshore oilfield economic limit is really
The method of determining is, according to Profit and loss balance principle, rate factor when considering lapse rate in the evaluation phase and recovering the oil, to establish dependency relation formula, from
And it can determine that economic limit primiparity of the oil well under certain oil price；
The determination method of Single Well Economic limit control reserve is to consider marine technological level, productivity index at present, establishes individual well warp
The relational expression for limit control reserve and the recovery percent of reserves of helping, so as to can determine that economic limit of the oil well under certain oil price controls storage
Amount, relational expression are as follows：
1. Single Well Economic limit primiparity qi
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In formula：Id+Ib+Ie-- individual wells drilling well investment+individual well ground investment+individual well operation expense, 104$
O+TAX-- tons oil operating cost+ton oil sale tax, $/t
PO-- oil price, $/t
ER- recovery percent of reserves, %
R-- loan interest rates, %
T--- evaluates the time limit, year
DC-- evaluation phase lapse rate, %
τO-- rate during oil recovery, decimal
α -- crude oil commodity rate, %
β -- oil well coefficient.
3. offshore oilfield new well in old district according to claim 1 encrypts well-arranging procedure, it is characterised in that in step 2, root
According to existing oil price, the value according to last a bite Encryption Well newly increased recoverable reserves is equal to this mouthful of well capital construction gross investment and investment
The principle of the summation of operating cost in payoff period, establishes offshore oilfield economic and reasonable pattern density calculation formula, and formula is as follows：
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<mn>8</mn>
<mi>P</mi>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<mn>0.4</mn>
<mi>L</mi>
</mrow>
</mfrac>
</mrow>
In formula：
ER--- ultimate recovery；
N--- producing well well spacing densities, well/km2；
K--- effective permeabilities, μm2；
μo--- crude oil underground viscosity, mPa.s；
Np--- the newly-increased economical rationality recoverable reserves of individual well, × 104t/well；
V--- per unit area reserves, × 104t/km2；
M--- individual well gross investments, Wan Yuan；
P--- individual well year production management expenses, Wan Yuan；
L--- crude oil prices, member/t；
N+1--- producing well reasonable well pattern densities, well/km2。
4. offshore oilfield new well in old district according to claim 1 encrypts well-arranging procedure, it is characterised in that in step 3, root
According to the difference of the actual geology characteristic of offshore oilfield, reservoir properties, fluid properties and pressure system, according to will have similar oil
Layer physical property, fluid properties and driving type, and possess certain area and reserves, there is certain reservoir thickness and 1-2 master
The oil reservoir of power layer, series of strata subdivision and the combined method of a set of series of strata are divided into, it is determined that the series of strata of marine oil reservoir are segmented with combining shape
Formula.
5. offshore oilfield new well in old district according to claim 1 encrypts well-arranging procedure, it is characterised in that in step 4, according to
According to offshore oilfield in the platform term of validity, high_speed development, improves the principle of recovery ratio as far as possible, while is sent out according to offshore oilfield oil reservoir
Feature is educated, takes into full account the other factor of existing old well well location and injection-production well, determines that offshore oilfield well pattern form is noted for five-spot area
Adopt based on well pattern, according to economic and reasonable pattern density, determine offshore oilfield economic and reasonable well spacing.
6. offshore oilfield new well in old district according to claim 1 encrypts well-arranging procedure, it is characterised in that in steps of 5, root
According to seismic reflection situation, and reservoir development situation and Well Pattern And Spacing are combined, it is determined that new well well location and target position；According to platform position
Put and determine new well exploitativeness；By accumulated output value of the new well of numerical Simulation Prediction within the evaluation phase, optimum results to the end are obtained,
Consider and determine new well well location.
7. offshore oilfield new well in old district according to claim 1 encrypts well-arranging procedure, it is characterised in that in step 6, leads to
New well well location, target coordinate and the oil-water well relation implemented are crossed, it is determined that new well layering, oil reservoir feelings are met by predicting that new well bores
Condition, plane note adopt the old well Production development of corresponding situation and surrounding, it is determined that new well perforation layer position and perforating degree, and make new well
Design parameter table and the adjacent old well measure quantity sheet of layering.
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