CN110644958B - Well selection and stratum selection method for large-scale flooding fluid injection measure of sandstone reservoir thin difference oil layer water injection well - Google Patents
Well selection and stratum selection method for large-scale flooding fluid injection measure of sandstone reservoir thin difference oil layer water injection well Download PDFInfo
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- CN110644958B CN110644958B CN201910885689.3A CN201910885689A CN110644958B CN 110644958 B CN110644958 B CN 110644958B CN 201910885689 A CN201910885689 A CN 201910885689A CN 110644958 B CN110644958 B CN 110644958B
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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
- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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
Abstract
The invention relates to a well selection and stratum selection method for a measure of injecting large-scale flooding fluid into a water injection well of a thin difference oil layer of a sandstone reservoir. The problem of poor water injection ability of the thin poor layer that the stratum of oil well production ability is lacked, the seepage flow ability is poor that the effective intercommunication can not form between oil-water well because of the stratum energy is not enough is mainly solved. The method is characterized in that: (1) for the target well, preferably: selecting wells with relatively perfect injection-production relation of well groups, poor connectivity of oil-water wells and long-term empty stratum; the water injection well should be a well with porosity, low air permeability, and a certain potential for potential excavation; the water injection well can meet the construction requirement of large-scale fracturing fluid injection oil displacement of the water injection well; (2) the target layer is preferably: and selecting the deposition unit with poor utilization and large potential as the target layer according to the parameters of the target well such as injection-production relation, oil layer development thickness, interlayer thickness, liquid production amount, liquid production strength, formation pressure, utilization condition and the like. The method improves the yield-increasing development effect of the thin difference layer.
Description
Technical Field
The invention relates to the technical field of oil field development, in particular to a well selection and layer selection method for a measure of injecting large-scale flooding fluid into a water injection well of a thin difference oil layer of a sandstone reservoir.
Background
At present, the conventional fracturing well selection layer is mainly used for selecting a well layer with oil layer pollution and oil layer seepage needing to be improved, changing the seepage condition of fluid in the stratum in a small range, removing the oil layer pollution, improving the oil layer seepage capability and improving the production capacity of a well. The new technology mainly selects a thin difference layer, a stratum energy depletion layer and a well layer with poor seepage capability, and injects large-scale flooding fluid into a water injection well to supplement stratum energy and change the seepage capability between a production well and the water injection well in a large range, so that the water injection well and the production well with the well spacing of more than 200m can be effectively communicated, and therefore, the conventional fracturing well selection method is not suitable for the new technology.
Disclosure of Invention
The invention provides a well selection method for a large-scale flooding fluid injection measure of a sandstone reservoir thin difference oil layer water injection well, aiming at solving the problems that in the background technology, because of large well spacing and poor thin difference layer seepage capability, the formation energy is insufficient, effective communication cannot be formed between a water injection well and an oil production well, and the mobility degree of an oil layer is low, so that the production capacity of the oil well is low. The well selecting and layer selecting method for the measure of injecting the large-scale flooding fluid into the water injection well of the thin difference oil reservoir aims at the well selecting and layer selecting method for the measure of injecting the large-scale flooding fluid into the water injection well of the thin difference layer, solves the problem that the water injection capability of the thin difference layer with stratum vacancy and poor seepage capability is poor, and improves the yield-increasing development effect of the thin difference layer.
The invention can solve the problems by the following technical scheme: a well selection and layer selection method for a measure of injecting large-scale flooding fluid into a water injection well of a thin difference oil layer of a sandstone reservoir comprises the following steps:
(1) make optimization for target well
Selecting wells with relatively perfect injection-production relation of well groups, poor connectivity of oil-water wells and long-term empty stratum; the water injection wells of the selected well group are wells with porosity, low air permeability, poor or no water absorption for a long time, poor well group utilization and residual oil enrichment and certain potential excavation potential due to large injection-production well spacing; the ground condition, the well cementation quality, the casing damage condition and the like of the water injection wells of the selected well group can meet the construction requirements of large-scale fracturing fluid injection oil displacement of the water injection wells;
(2) optimizing the target layer of the target well
And (2) preferably selecting a plurality of deposition units with poor utilization and large potential as target layers according to parameters of the target well preselected in the step (1), such as injection-production relation, oil layer development thickness, interlayer thickness, liquid production amount, liquid production strength, formation pressure, utilization condition, single sand layer geological reserve, water content level, extraction degree and the like.
The low porosity in the step (1) means that the average porosity range is 17-25%, the low porosity is 20-30mD, and the injection-production well spacing range is 150-300 m; the low porosity, low air permeability layer is the thin differential layer.
In the step (2), the perfect injection-production relation means that the number of oil wells correspondingly communicated with the injection hole layer is 3 or more than 3; in the step (2), the poor connectivity of the corresponding oil layer of the communicated oil well means that the isotope shows no water absorption or low water absorption.
The method for calculating the stratum deficit of the well with the stratum in deficit in the step (1), namely an injection-production ratio balance method, comprises the following steps: taking water injection by a five-point method as an example, see the attached figure 1:
Q1＝Qah2/(h1+h2+h3+h4)
Q2＝Qbh5/(h5+h6+h7+h8)
Q3＝Qch9/(h9+h10+h11+h12)
Q4＝Qdh13/(h13+h14+h15+h16)
in the formula: h1, h2 and h3 … … h16 are oil wells a, b,c. d, the communication thickness of the water well communicated with the periphery; qa、Qb、Qc、QdThe cumulative liquid production of the oil wells a, b, c and d; q1、Q2、Q3、Q4The liquid production amount provided for the oil wells a, b, c and d for the well A;
liquid volume provided by well a for surrounding wells:
Q＝Q1+Q2+Q3+Q4
the cumulative injection amount of the well A is P, and if Q > P, the stratum is empty.
Wherein, the well group is selected that each oil well is communicated with 4 water wells, the ratio of oil to water wells is 1:1, the water well A supplies water for the four surrounding oil wells a, b, c and d, and the water well A supplies water for the oil well a to ensure that the oil well a obtains the liquid yield Q1＝Qah2/(h1+h2+h3+h4) (the ratio of the liquid production is calculated according to the ratio of the communication thickness of the well A and the well a to the communication thickness of the well a and all the surrounding communication wells), the well A supplies water to the well b, so that the well b obtains the liquid production Q2＝Qbh5/(h5+h6+h7+h8) (the ratio of the liquid production amount is calculated according to the ratio of the communication thickness of the well A and the well b to the communication thickness of the well b and all the communication wells around the well B); well A supplies water to well c so that well c obtains a fluid yield Q3＝Qch9/(h9+h10+h11+h12) (the ratio of the liquid production amount is calculated according to the ratio of the communication thickness of the well A and the oil well c to the communication thickness of the oil well c and all the communication wells around); the water well A supplies water to the oil well d so that the oil well d obtains the liquid production amount Q4＝Qdh13/(h13+h14+h15+h16) (the ratio of the liquid production is calculated according to the ratio of the communication thickness of the well A and the well d to the communication thickness of the well d and all the communication wells around). The sum of the cumulative liquid production amounts obtained by supplying water to the well A of the 4 surrounding wells is Q ═ Q1+Q2+Q3+Q4If the cumulative water injection rate of well A is less than the cumulative liquid production rate obtained by supplying water to the surrounding connected wellsAnd the sum Q proves that the stratum is lacunae, and the method for calculating the stratum lacunae is called injection-production ratio balance method.
Compared with the background technology, the invention has the following beneficial effects: the well selection layer selecting method for the measure of injecting the large-scale flooding fluid into the sandstone reservoir thin difference oil layer water injection well can effectively select the well layer with long-term stratum depletion and poor communication between the oil production well and the water injection well. The communication distance between the oil production well and the water injection well reaches more than 3 times of the original communication distance, so that the seepage capability of fluid in the stratum is greatly improved, the production capability of the well is improved, the aim of increasing the production and the oil is maximized is fulfilled, and necessary precondition guarantee is provided for improving the overall development effect of the well group. Because the communication relation of the selected well thin difference layer is improved, the extraction degree of the small layer of the communicated oil well is increased; at the well end, the injection capacity is greatly improved after the measures are taken, the water absorption condition of the thin differential layer is improved, and the water drive control degree is improved.
Description of the drawings:
FIG. 1 is a schematic diagram of a calculation method of water well stratum deficit in embodiment 1 of the invention (taking five-point method water injection as an example);
FIG. 2 is a production curve of a communicating oil well around the apricot 13-10-slant 117 well in the embodiment 1 of the invention.
The specific implementation mode is as follows:
the invention will be further described with reference to the following drawings and specific embodiments:
example 1
The invention is further explained by combining 13-10-inclined 117 wells of apricot trees and oil fields of Daqing oil fields.
(1) Make optimization for target well
The apricot 13-10-inclined 117 well is a secondary encrypted water injection well of an apricot thirteen-region transition zone, 4 oil production wells are communicated around the apricot 13-10-inclined 117 well, the injection and production relations are complete, the thickness of two groups of sandstone of shooting and cracking is 17.5m, the effective thickness is 3.9m, and the daily injection at the initial stage of the injection is 41m3Because of the aberration of exploitation, the distance between injection and production wells is large (the minimum is 156m), and water absorption is gradually reduced after injection. The water well apricot 13-10-oblique 117 is communicated with four oil well apricots 13-10-oblique 116, apricot 13-butyl 1-116, apricot 13-10-119 and apricot 13-butyl 1-118, according to the injection-production ratio balance methodThe cumulative injection amount of the water well apricot 13-10-oblique 117 is smaller than the cumulative liquid production amount obtained by supplying water to four oil wells communicated with the periphery of the water well apricot, and the stratum is empty. The well point position is 143m away from the fault, the current whole well production degree of the apricot 13-10-inclined 117 well is 15.1 percent, the utilization degree is low, the layering utilization difference of the surrounding oil wells is large, the production degree is low, the formation pressure is low, the residual oil is enriched, and the potential excavation potential is achieved after comprehensive evaluation according to perforation explanation data, the current water injection condition, the reservoir utilization condition and other data. From the quality of well cementation after drilling and the quality of well cementation newly measured at present, the method has no casing damage record, and the quality of well cementation in an oil interval is good, and is preferably a target well.
(2) Optimizing the target layer of the pre-selected target well
According to the parameters of injection-production relationship, oil layer development thickness, interlayer thickness, liquid production quantity, liquid production strength, stratum pressure, utilization condition, single sand layer geological storage quantity, water content grade and production degree, preferably selecting 13 deposition units with poor utilization and large potential as target layers, namely SII11、SII12、SII13、SII41、SII42、SII50、SII92、SII100、SII111、SII112、SII114、SII115、SII120。
The geological reserves of the apricot 13-10-inclined 117 well single sand layer are calculated as follows: the apricot 13-10-inclined 117 wells are bet in 7 months of 2012, 29 sedimentation units are shot, two groups of sandstone of 17.5m are shot, the effective thickness is 3.9m, the geological reserve is 13298 tons, and the geological reserve of a single sand layer is calculated according to the geological reserve of the target well, the sand body characteristics, the thickness of the single sand layer, the physical property of the reservoir and other parameters. The well interval geological reserve results are shown in the attached table 1.
Finally, according to the parameters of interlayer thickness, use condition and oil layer physical property, the target layer is combined into layers according to the principle that the use condition is similar and the oil layer physical property is similar. 4 fracturing intervals are divided, the thickness of the fracturing sandstone is 11.8m, and the effective thickness is 3.3 m. The well segments are divided as shown in attached table 2.
Attached table 1
Attached table 2
Completing the measures of 13-10-oblique 117 wells in 2017, 11 months and 17 days, and co-injecting a pressure flooding fluid 10320631 m3Then the pipe column is pulled out and is waited for overhaul, the well is operated and opened after 3, month and 15 days overhaul in 2018, the injection capacity is greatly improved after measures, and at present, the accumulative water increase of 15712m is realized3。
4 affected oil wells are communicated around the apricot 13-10-inclined 117 well, and the injection is distributed from 50m in 5 months and 3 days in 20183Mention is made of 65m3Number 5 month 7 of 2018, mention 80m3。
After the large-scale flooding fluid is injected by using the well-selecting and stratum-selecting method, the communication relation of a thin difference stratum between a water injection well and a production well is improved, the communication distance between the production well and the water injection well is 3.5 times of the original communication distance, the daily water injection amount is 79m3 from no water absorption at the water well end, the injection pressure is reduced to 10MPa from 13MPa, the average fluid production strength at the oil well end is increased to 6t/d.m from 1t/d.m, and the utilization degree of the thin difference stratum is increased to 55% from 31%. And (3) until No. 1 and No. 9 in 2019, the validity period reaches 301 days, the current effective daily oil increment is 4.5t, the current effective daily oil increment is 1821.02t, and the well group production curve is as shown in figure 2 (the water injection curve is the daily average water injection amount before and after the water well injects the large-scale flooding fluid, and the daily liquid production curve, the daily oil production curve and the water content curve are the daily average liquid production amount, the daily average oil production amount and the water content value before and after the four oil wells are communicated around the water injection well and the large-scale flooding fluid is injected).
Claims (4)
1. A well selection and layer selection method for a measure of injecting large-scale flooding fluid into a water injection well of a thin difference oil layer of a sandstone reservoir comprises the following steps:
(1) make optimization for target well
Selecting wells with relatively perfect injection-production relation of well groups, poor connectivity of oil-water wells and long-term empty stratum; the water injection wells of the selected well group are wells with low porosity, low air permeability, poor or no water absorption for a long time, poor well group utilization and residual oil enrichment and certain potential for excavation due to large injection-production well spacing; the ground condition, the well cementation quality and the casing damage condition of the water injection wells of the selected well group can meet the construction requirement of large-scale injection of the flooding fluid into the water injection wells for displacement of reservoir oil;
(2) optimizing the target layer of the target well
According to the optimized parameters of perforation condition, oil layer development thickness, interlayer thickness, liquid production amount, liquid production strength, formation pressure, utilization condition, single sand layer geological storage, water content level and extraction degree of the target well in the step (1), the optimized injection-extraction relation is perfect, the corresponding oil layer of the communicated oil well has poor connectivity, the potential is large, and a plurality of poor deposition units are used as target layers;
the method for calculating the stratum deficit of the well with the stratum in deficit in the step (1), namely an injection-production ratio balance method, comprises the following steps:
Q1＝Qah2/(h1+h2+h3+h4)
Q2＝Qbh5/(h5+h6+h7+h8)
Q3＝Qch9/(h9+h10+h11+h12)
Q4＝Qdh13/(h13+h14+h15+h16)
in the formula: h1, h2 and h3 … … h16 are respectively the communication thicknesses of the oil wells a, b, c and d and the surrounding communication water wells; qa、Qb、Qc、QdThe cumulative liquid production of the oil wells a, b, c and d; q1、Q2、Q3、Q4The liquid production amount provided for the oil wells a, b, c and d for the well A;
liquid volume provided by well a for surrounding wells:
Q＝Q1+Q2+Q3+Q4
the cumulative injection amount of the well A is P, and if Q is more than P, the stratum is empty.
2. The well selection and layer selection method for the large-scale flooding fluid injection measure of the sandstone reservoir thin difference oil layer water injection well according to claim 1, which is characterized by comprising the following steps of: the low porosity in the step (1) means that the average porosity is in the range of 17-25%, the low porosity is in the range of 20-30mD, and the injection-production well spacing is in the range of 150-300 m.
3. The well selection and layer selection method for the large-scale flooding fluid injection measure of the sandstone reservoir thin difference oil layer water injection well according to claim 1, which is characterized by comprising the following steps of: in the step (2), the perfect injection-production relation means that the number of the oil wells correspondingly communicated with the injection hole layer is 3 or more than 3.
4. The well selection and layer selection method for the large-scale flooding fluid injection measure of the sandstone reservoir thin difference oil layer water injection well according to claim 1, which is characterized by comprising the following steps of: in the step (2), the poor connectivity of the corresponding oil layer of the communicated oil well means that the isotope shows no water absorption or low water absorption.
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| CN112324413B (en) * | 2020-11-02 | 2022-10-18 | 中国石油化工股份有限公司 | Chemical construction method for improving injection amount of injection well |
| CN112627792B (en) * | 2020-12-18 | 2022-04-26 | 大庆油田有限责任公司 | Isolated well point fracturing oil displacement post-fluid replacement yield increase method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018213083A1 (en) * | 2017-05-15 | 2018-11-22 | University Of Houston System | Advanced technique for screening enhanced oil recovery and improved oil recovery methodologies for a petroleum reservoir |
| CN108915649A (en) * | 2018-07-25 | 2018-11-30 | 大庆油田有限责任公司 | A kind of oil reservoir pressure is stifled to drive technology pattern preferred method |
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| CN103046910B (en) * | 2013-01-10 | 2015-11-25 | 中国石油天然气股份有限公司 | Ultra-high water cut stage reservoir water drive development approach |
| CA2939679A1 (en) * | 2016-08-18 | 2018-02-18 | Velvet Energy Ltd. | Fracture length increasing method |
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| CN108915649A (en) * | 2018-07-25 | 2018-11-30 | 大庆油田有限责任公司 | A kind of oil reservoir pressure is stifled to drive technology pattern preferred method |
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