CN106593409A - Recognition method for futile cycle in oilfield injection-production relation - Google Patents
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- 238000002347 injection Methods 0.000 claims description 40
- 239000007924 injection Substances 0.000 claims description 40
- 238000000605 extraction Methods 0.000 claims description 19
- 239000003129 oil well Substances 0.000 claims description 11
- 238000004088 simulation Methods 0.000 claims description 6
- 206010016807 Fluid retention Diseases 0.000 claims description 4
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Abstract
The invention discloses a recognition method for futile cycle in an oilfield injection-production relation. The recognition method is characterized by comprising the following steps: static recognition of futile cycle, recognition of a well logging curve, and dynamic recognition of futile cycle. The step of static recognition of the futile cycle further comprises the following substeps: selection of injection-production well groups and selection of sedimentary facies types. The step of recognition of the well logging curve further comprises the following substeps: division of thick and thin oil layers, selection of water-out interpretation results, and recognition of the well logging curve. In the method, various data including fine geology research achievements, profile testing, well logging interpretation and the like are comprehensively utilized, distribution conditions of futile cycle fields are clear and definite, field tests are carried out, good effects are achieved, and reliable basis is provided for followed-up water-flooding development.
Description
Technical field
The present invention relates to the recognition methods in a kind of oil field geologic engineering, invalid in more particularly to a kind of oil field injection and extraction relation
The recognition methods of circulation.
Background technology
Domestic land sandstone oil field causes oil field development due to the otherness of its permeability and the gravitational differentiation of profit
Middle injection water is advanced by leaps and bounds preferentially along Channel sandstone main body band bottom to oil well, and under long-term injecting water Scouring Condition, gradually shape
Macropore is washed by force into the Thief zone being interconnected between oil, well.After macropore is formed, note people water is main along big
After macropore is formed, injection water mainly flows along macropore, cannot recur to the purpose for driving remaining oil.Using note
Adopt the concept of validity to be described the utilization ratio for injecting water.If injection water use efficiency is very low, do not rise substantially
To the effect of displacement crude oil, then think there is macropore between injection-production well, note adopts invalid；Although if injection water use efficiency is higher,
But the speed being deteriorated is very fast, then think that macropore is in formation stages, note adopts poorly efficient.If injection water use efficiency it is higher and
Steadily, then think that production is normal, for note adopts invalid well, should at once take profile control and water plugging measure, for note adopts poorly efficient well,
Observation should then be further strengthened.
Therefore, the identification of validity is adopted to note and judges that will implement decreasing water cut and increasing oil measure as oil field has directive significance.Greatly
Amount laboratory experiment and dynamic analysis shows:The well of low effective circulation field is easily formed, there is certain similitude on its geological structure；It is low
After effect or inefficient cycle field are formed, also tend in its dynamic performance consistent.
Inefficient cycle field refers to water flooding to after certain phase, and the displacement of reservoir oil effect that water is injected in reservoir is extremely weak or not
Work.Because the cyclicity of reservoir, the otherness of permeability, the degree of consolidation of rock and long-term injecting water are washed away and formed
, it is also the inevitable rule of waterflooding oil field.
Inefficient cycle field causes the inefficient cycle of injection water, considerably reduces water-injection efficiency.How poorly efficient nothing is recognized
Effect cyclical field, further excavates remaining reserves, is the major issue that oil field faces into the exploitation of sequent water flooding stage.
The content of the invention
The technical problem to be solved is, there is provided the identification side of inefficient cycle in a kind of oil field injection and extraction relation
Method.The inventive method for ultra-high water cut stage inefficient cycle aggravation, the situation of high energy consumption, be further reduce oil field development into
Originally, oil field development benefit, suggestions for improvement, according to the research of inefficient round-robin basis and identification and improvement correlation technique are improved
Achievement, with reference to expertise, has invented inefficient cycle efficient identification method.The inventive method integrated use fine geological study into
Really, the multinomial data such as section plane test, well log interpretation, specify that the distribution situation of inefficient cycle field, and carry out field test, obtain
Better effects, for sequent water flooding exploitation reliable basis are provided.
To solve above-mentioned technical problem, the invention provides a kind of recognition methods of oil field injection and extraction relation inefficient cycle, bag
Include following steps：The step of inefficient cycle static identification, the step of log is recognized, the step of inefficient cycle Dynamic Recognition.
The step of inefficient cycle static state identification, preferably further include：The sub-step of injection-production well group selection；Sedimentary facies
The sub-step of type selecting.
The step of log is recognized, preferably further includes：Knot is explained in the sub-step of thickness reservoir division, water logging
The sub-step that fruit selects, the sub-step of log identification.
The step of inefficient cycle Dynamic Recognition, preferably further include：The sub-step of oil well identification scoring, well is known
The sub-step not scored.
The sub-step of the injection-production well group selection may further include：
Centered on water injection well W, producing well O of the well spacing less than or equal to 600m is selected, composition note adopts combination well to (W, O)；
S (W, O) n values are undetermined；
If well spacing is more than 600m, S (W, O) n=0.
The sub-step that the type of sedimentary facies is selected may further include：
Give six kinds of sand body connectivity types：River course～river course, river course～main body, main body～main body, river course～nonbody, master
Body～river course, nonbody～river course；
Undetermined injection-production relation (W, O) ns all for upper step, judge type of sedimentary facies of the well group in all connection oil reservoirs；
If it is undetermined to meet this six types S (W, O) n value；
If connectivity types are unsatisfactory for this six type, S (W, O) n=0.
The sub-step of the oil well identification scoring, may further include：Injection-production relations (W, O) undetermined all for upper step
N, by the production profile figure of the oil well, measures individual layer water-retention value A, water saturation B of the layer n obtained by numerical simulation and
Liquid multiple C is produced, by A, tri- values of B, C carry out the normalized within 100, and normalized formula is as follows：
It is worth normalized result using three to sue for peace as the initial value of S (W, O) n.
The sub-step of the well identification scoring, may further include：For upper step all injection-production relations (W, O) n, lead to
The intake profile figure of the water injection well is crossed, individual layer relative injectivity A and unit thickness water absorption B is measured, is obtained by numerical simulation
The amount of water injected C of layer n, by A, tri- values of B, C carry out the normalized within 100, and normalized formula is as follows：
It is worth normalized result summation by three, is designated as S ', S (W, O) n=S (W, O) n+S ' is set.
To solve above-mentioned technical problem, present invention also offers a kind of recognition methods of oil field injection and extraction relation inefficient cycle,
All water injection wells and oil recovery well information in by being input into oil field block to be judged, by selecting the step of scoring, judge whether
There is inefficient cycle.
It is described to select the step of scoring, preferably further include：All sequence of steps are performed, and the selection result of back is made
For the input of next step, when score S (W, the O) n of injection-production relation is set to 0, the injection-production relation no longer enters into next step
Suddenly scored, wherein W represents water injection well, O represents producing well, (W, O) represents injector-producer pair, (W, O) n represents that injector-producer pair exists
Layer n connections, S (W, O) n represents the scoring of injection-production relation.
The beneficial effect that the present invention is produced includes：
1st, based on based on oil field geologic data more than traditional inefficient cycle recognition methods, recognition accuracy is relatively low, does not examine
Consider the dynamic change of creation data, the inventive method employs mode of the geologic data in combination with creation data, and is counting
According to a set of criterion is given on basis, the comprehensively presence of identification inefficient cycle；
2nd, traditional inefficient cycle recognition methods is mostly qualitative analysis, and the result judged is barely satisfactory, and the inventive method is given
Go out the scoring that each injection-production relation in block has inefficient cycle, so as to quantitative analyzes inefficient cycle, this causes to judge
As a result it is easier to be adopted by oilfield work.
Description of the drawings
Fig. 1 is inefficient cycle recognition methods flow chart described in the embodiment of the present invention；
Fig. 2 is the connectivity types figure in inefficient cycle recognition methods described in the embodiment of the present invention；
Fig. 3 is the sedimentary facies belt figure described in the embodiment of the present invention on oil reservoir n；
Fig. 4 is the direction finding curve map of the depth three described in the embodiment of the present invention；
Fig. 5 is interval transit time curve figure described in the embodiment of the present invention；
Fig. 6 is densogram described in the embodiment of the present invention；
Fig. 7 is Micro-electrode Log Curves figure described in the embodiment of the present invention；
Fig. 8 is spontaneous potential curve figure described in the embodiment of the present invention.
Specific embodiment
To make the objects, technical solutions and advantages of the present invention clearer, clear and definite, develop simultaneously referring to the drawings embodiment pair
The present invention is further described, but the invention is not limited in these embodiments.
The recognition methods of inefficient cycle in oil field injection and extraction relation of the present invention, is dynamic with production according to oil field geologic static data
The mode that state data combine, provides inefficient cycle standards of grading, finally with fraction to every a pair of injection-production relations well in block
Form elaborates the possibility that there is inefficient cycle in injection-production relation.The recognition methods of inefficient cycle specifically related in injection-production relation
Flow process, including static identification, log identification, Dynamic Recognition.
In one embodiment of the invention, oil field injection and extraction relation inefficient cycle recognition methods is divided into three big steps：Inefficient cycle
Static state identification, log identification, inefficient cycle Dynamic Recognition.The input information of method for oil field block to be judged in it is all
Water injection well, producing well carries out selection scoring by the method, finally provides the scoring of all injection-production relations, and Gao Yueke is got in scoring
Can there is inefficient cycle.
Scoring explanation：All sequence of steps are performed, the selection result of back as next step input, when note adopts pass
When score S (W, the O) n of system is set to 0, the injection-production relation no longer enters into next step and is scored, and wherein W represents water filling
Well, O represents producing well, and (W, O) represents injector-producer pair, and (W, O) n represents that injector-producer pair is connected in layer n, and S (W, O) n represents that note is adopted
The scoring of relation.
One more embodiment of the present invention, as shown in figure 1, being inefficient cycle recognition methods flow process described in the embodiment of the present invention
Figure.
The recognition methods of oil field injection and extraction relation inefficient cycle of the present invention, comprises the following steps：The static identification of inefficient cycle
Step, the step of log is recognized, the step of inefficient cycle Dynamic Recognition.
The step of inefficient cycle static state identification, preferably further include：The sub-step of injection-production well group selection；Sedimentary facies
The sub-step of type selecting.
The step of log is recognized, preferably further includes：Knot is explained in the sub-step of thickness reservoir division, water logging
The sub-step that fruit selects, the sub-step of log identification.
The step of inefficient cycle Dynamic Recognition, preferably further include：The sub-step of oil well identification scoring, well is known
The sub-step not scored.
In yet another embodiment of the invention, oil field injection and extraction relation inefficient cycle recognition methods is divided into three big steps：It is invalid to follow
The static identification of ring, log identification, inefficient cycle Dynamic Recognition.
The static identification of 1 inefficient cycle
(1) injection-production well group selection
Centered on water injection well W, producing well O of the well spacing less than or equal to 600m is selected, composition note adopts combination well to (W, O), S
(W, O) n is undetermined.If well spacing is more than 600m, S (W, O) n=0.
(2) type of sedimentary facies is selected
Undetermined injection-production relation (W, O) ns all for upper step, judge type of sedimentary facies of the well group in all connection oil reservoirs,
Give six kinds of sand body connectivity types：River course～river course, river course～main body, main body～main body, river course～nonbody, main body～river
Road, nonbody～river course, as shown in Fig. 2 S (W, the O) n=0 if connectivity types are unsatisfactory for this six type, if meeting this
Six types, S (W, O) n is undetermined.
2 logs are recognized
(1) thickness reservoir division
Undetermined injection-production relation (W, O) ns all for upper step, statistics producing well connection oil reservoir belongs to thick oil pay or thin oil
Layer, statistical method is to calculate the thickness for adding up effective sandstone in the oil reservoir, if effective sandstone thickness is more than or equal to 2m (W, O)
N is thick oil pay, and (W, O) n is oil sheet if effective sandstone thickness is less than 2m.
(2) water logging explanation results are selected
Undetermined injection-production relation (W, O) ns all for upper step, according to the water logging explanation results of the producing well log, such as
Fruit is not high water logging then S (W, O) n=0, and if high water logging, then S (W, O) n is undetermined.
(3) log identification
For five kinds of logs that oil well is commonly used：The direction finding curve of the depth three, interval transit time curve, density are bent
Line, Micro-electrode Log Curves, spontaneous potential curve, provide every kind of curve when there is inefficient cycle, the numerical characteristics of curve.Give below
Go out numerical characteristics when inefficient cycle occur in five kinds of curves.
Direction finding curvilinear characteristic (Ω m) of the depth three：The resistivity of rock matrix is reduced, compared with high Flooding Characteristics under amplitude
Drop, wherein thick oil pay≤30, oil sheet≤20.
Interval transit time curve feature (μ s/ft)：The porosity change of inefficient cycle position is obvious, and water saturation is relatively
Height, wherein thick oil pay >=340, oil sheet >=330.
Density curve feature (g/cm3)：Inefficient cycle position, Jing after water washes away, density value can be corrected without significant change
Other profile amplitudes are raised and lowered and are not as the change that lithology causes, wherein thick oil pay≤2.15, oil sheet≤2.25.
Micro-electrode Log Curves feature (Ω m)：Aqueous higher part position is susceptible to the borehole wall and electrically adsorbs, compared with high Flooding Characteristics
Fall is thick-layer, thin layer amplitude declines 2.
Spontaneous potential curve feature (mv)：Diffusion adsorption potential variation, electrofiltration potential is raised, the phase compared with high Flooding Characteristics
5 are to rising a height of thick-layer, thin layer amplitude.
Log standards of grading are if any 3 or 3 in deep lateral, sound wave, density, microelectrode, spontaneous potential curve
More than meet standard, S (W, O) n is undetermined, otherwise S (W, O) n=0.
3 inefficient cycle Dynamic Recognitions
(1) oil well identification scoring
Undetermined injection-production relation (W, O) ns all for upper step, by the production profile figure of the oil well, measure individual layer water-retention value
Water saturation B and product liquid multiple C of A, the layer n obtained by numerical simulation, by A, tri- values of B, C carry out returning within 100
One change is processed, and normalized formula is as follows：
It is worth normalized result using three to sue for peace as the initial value of S (W, O) n.
(2) well identification scoring
For upper step all injection-production relations (W, O) n, by the intake profile figure of the water injection well, the relative water suction of individual layer is measured
Amount A and unit thickness water absorption B, by numerical simulation the amount of water injected C of layer n is obtained, and by A, tri- values of B, C are carried out within 100
Normalized, normalized formula is as follows：
It is worth normalized result summation by three, is designated as S ', S (W, O) n=S (W, O) n+S ' is set.
In sum, scoring S (W, the O) n of all injection-production relations in the oil field block is obtained.
In one more embodiment of the present invention, there is provided the embodiment of a specific inefficient cycle identification.Concrete step
It is rapid as follows：
(1) it is static
As shown in figure 3, being the sedimentary facies belt figure on oil reservoir n.Certain oil field 5-2117 pumpingh wells and water injection well 5-2027.It is existing
Calculating injection-production relation score of two mouthfuls of wells on certain oil reservoir n.
Shown in sedimentary facies belt figure by the oil field on oil reservoir n, two mouthfuls of wells are 312m in the well spacing of oil reservoir n, and 5-2027 is
Main body Sandstone Types, 5-2117 is river channel sand, and the well spacing of the two is less than 600m, belongs to river course～main body connectivity types, therefore S
(W, O) n is undetermined.
(2) log
| 5-2117(m) | High water out thickness | Middle water out thickness | Low water out thickness | Non- water out thickness | Accumulative effective thickness |
| 4.0 | 0.8 | 0.7 | 0.2 | 4.2 |
Upper table provides 5-2117 and explains in the water logging depth of layer n, and as can be seen from the table the effective sandstone of the oil reservoir is tired
Meter thickness is more than 2m, belongs to thick oil pay, and high water out thickness occupy oil reservoir gross thickness ratio it is higher, belong to high water cut oil
Layer, therefore S (W, O) n is undetermined.
As Figure 4-8, it is five logs of 5-2117.Wherein, Fig. 4 is surveyed for the depth three described in the embodiment of the present invention
To curve map；Fig. 5 is interval transit time curve figure described in the embodiment of the present invention；Fig. 6 is densogram described in the embodiment of the present invention；
Fig. 7 is Micro-electrode Log Curves figure described in the embodiment of the present invention；Fig. 8 is spontaneous potential curve figure described in the embodiment of the present invention.According to upper
Step judges that the oil reservoir belongs to thick oil pay, wherein deep lateral, density, sound wave, microelectrode is satisfied by the criterion of inefficient cycle, from
So current potential is unsatisfactory for, therefore S (W, O) n is undetermined.
(3) dynamic
Following table is the parameters value of producing well 5-2117 and water injection well 5-2027, and producing well must be divided into 0.25+0.12+
0.18=0.55, water injection well must be divided into 0.14+0.17+0.21=0.52, therefore S (W, O) n=0.55+0.52=1.07, wherein
The normalized value of parameters be the well parameter value divided by block all well parameter values and gained.
| Individual layer water-retention value | Water saturation | Produce liquid multiple | |
| Producing well 5-2117 | 97% | 65% | 4.0PV |
| Normalized value | 0.25 | 0.12 | 0.18 |
| Individual layer relative injectivity | Unit thickness water absorption | Amount of water injected | |
| Water injection well 5-2027 | 20% | 15m3/d·m | 5.0PV |
| Normalized value | 0.14 | 0.17 | 0.21 |
The above, is only several embodiments of the present invention, and any type of restriction is not done to the present invention, although this
It is bright to be disclosed as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art are not taking off
In the range of technical solution of the present invention, make a little variation using the technology contents of the disclosure above or modification is equal to
Effect case study on implementation, belongs in the range of technical scheme.
Claims (10)
1. a kind of recognition methods of oil field injection and extraction relation inefficient cycle, it is characterised in that comprise the following steps：Inefficient cycle is static
The step of identification, the step of log is recognized, the step of inefficient cycle Dynamic Recognition.
2. the recognition methods of oil field injection and extraction relation inefficient cycle according to claim 1, it is characterised in that the inefficient cycle
The step of static state identification, further include：The sub-step of injection-production well group selection；The sub-step that type of sedimentary facies is selected.
3. the recognition methods of oil field injection and extraction relation inefficient cycle according to claim 1, it is characterised in that the log
The step of identification, further include：The sub-step of thickness reservoir division, the sub-step that water logging explanation results are selected, log
The sub-step of identification.
4. the recognition methods of oil field injection and extraction relation inefficient cycle according to claim 1, it is characterised in that the inefficient cycle
The step of Dynamic Recognition, further include：The sub-step of oil well identification scoring, the sub-step of well identification scoring.
5. the recognition methods of oil field injection and extraction relation inefficient cycle according to claim 2, it is characterised in that the injection-production well group
The sub-step of selection is further included：
Centered on water injection well W, producing well O of the well spacing less than or equal to 600m is selected, composition note adopts combination well to (W, O)；
S (W, O) n values are undetermined；
If well spacing is more than 600m, S (W, O) n=0.
6. the recognition methods of oil field injection and extraction relation inefficient cycle according to claim 2, it is characterised in that the deposition is similar
The sub-step that type is selected is further included：
Give six kinds of sand body connectivity types：River course～river course, river course～main body, main body～main body, river course～nonbody, main body～
River course, nonbody～river course；
Undetermined injection-production relation (W, O) ns all for upper step, judge type of sedimentary facies of the well group in all connection oil reservoirs；
If it is undetermined to meet this six types S (W, O) n value；
If connectivity types are unsatisfactory for this six type, S (W, O) n=0.
7. the recognition methods of oil field injection and extraction relation inefficient cycle according to claim 4, it is characterised in that the oil well identification
The sub-step of scoring, further includes：Undetermined injection-production relation (W, O) ns all for upper step, by the production profile of the oil well
Figure, measures individual layer water-retention value A, water saturation B and product liquid multiple C of the layer n obtained by numerical simulation, by A, B, C tri-
Value carries out the normalized within 100, and normalized formula is as follows：
It is worth normalized result using three to sue for peace as the initial value of S (W, O) n.
8. the recognition methods of oil field injection and extraction relation inefficient cycle according to claim 4, it is characterised in that the well identification
The sub-step of scoring, further includes：For upper step all injection-production relations (W, O) n, by the intake profile figure of the water injection well,
Individual layer relative injectivity A and unit thickness water absorption B are measured, the amount of water injected C of layer n is obtained by numerical simulation, by A, B, C tri-
Individual value carries out the normalized within 100, and normalized formula is as follows：
It is worth normalized result summation by three, is designated as S ', S (W, O) n=S (W, O) n+S ' is set.
9. a kind of recognition methods of oil field injection and extraction relation inefficient cycle, it is characterised in that in by being input into oil field block to be judged
All water injection wells and oil recovery well information, by select scoring the step of, judge whether inefficient cycle.
10. the recognition methods of oil field injection and extraction relation inefficient cycle according to claim 9, it is characterised in that the selection is commented
The step of dividing, further include：All sequence of steps are performed, and the selection result of back works as note as the input of next step
When score S (W, the O) n for adopting relation is set to 0, the injection-production relation no longer enters into next step and is scored, and wherein W represents note
Well, O represents producing well, and (W, O) represents injector-producer pair, and (W, O) n represents that injector-producer pair is connected in layer n, and S (W, O) n represents note
Adopt the scoring of relation.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109779622A (en) * | 2019-02-22 | 2019-05-21 | 中国石油大学(华东) | Ultra-high water cut stage oil reservoir inefficient water filling band characterizing method and device |
| CN114320262A (en) * | 2020-10-10 | 2022-04-12 | 中国石油天然气股份有限公司 | Method and device for optimizing injection and production structure of oil-water well |
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| CN114320262B (en) * | 2020-10-10 | 2024-04-30 | 中国石油天然气股份有限公司 | Method and device for optimizing injection and production structure of oil-water well |
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