CN105625992A - Reasonable liquid extracting method specific to roof ridge fault block oil reservoir - Google Patents
Reasonable liquid extracting method specific to roof ridge fault block oil reservoir Download PDFInfo
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- CN105625992A CN105625992A CN201410641263.0A CN201410641263A CN105625992A CN 105625992 A CN105625992 A CN 105625992A CN 201410641263 A CN201410641263 A CN 201410641263A CN 105625992 A CN105625992 A CN 105625992A
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Abstract
The invention provides a reasonable liquid extracting method specific to a roof ridge fault block oil reservoir. The reasonable liquid extracting method specific to the roof ridge fault block oil reservoir comprises the steps that 1, according to the geological parameters and the exploitation stage of an oil reservoir, the roof ridge fault block oil reservoir where a liquid extracting measure can be conducted is determined; 2, exploitation condition analysis is conducted on the selected oil reservoir, and the current open oil-water well condition is mainly analyzed; and 3, according to the actual conditions of the oil reservoir, the technical policies such as the liquid extracting range, the liquid extracting mode, oil reservoir average formation pressure keeping level for conducting the liquid extracting measure are determined. Through the reasonable liquid extracting method specific to the roof ridge fault block oil reservoir, timely and reasonable liquid extracting for the roof ridge fault block oil reservoir can be effectively guided, and technical support is provided for keeping the stable yield and improving the development effect for the roof ridge fault block oil reservoir in an ultrahigh water-cut stage.
Description
Technical field
The present invention relates to fault block oil reservoir yield stable yields and suggestions for improvement field, especially relate to a kind of reasonable extract method for ridge fault block oil reservoir.
Background technology
The feature of ridge fault block oil reservoir is textural to have certain inclination angle, and edge has the limit water of certain energy, the well pattern forms adopting low note height to adopt more. Fault block oil reservoir big portion in current old liberated area enters super-high water-cut stage, and stable yields difficulty increases, extract be a kind of in the oil reservoir development later stage by the wide variety of stable yields measure of mining site. But in actual applications, occurring in that oil well sudden water flooding after part oil reservoir extract, yield declines on the contrary, causes development effectiveness to be deteriorated. Therefore we are for the feature of ridge fault block oil reservoir, it is proposed that a kind of reasonable extract method for ridge fault block oil reservoir, solve above technical problem.
Summary of the invention
It is an object of the invention to provide a kind of foundation by numerical simulation technology and be suitable for the screening criteria of extract oil reservoir, rational extract technical limits, its Appropriate application can be realized the reasonable extract method for ridge fault block oil reservoir of the effective extract of oil well.
The purpose of the present invention can be achieved by the following technical measures: for the reasonable extract method of ridge fault block oil reservoir, should include for the reasonable extract method of ridge fault block oil reservoir: step 1, geologic parameter according to oil reservoir and development phase, it is determined that the ridge fault block oil reservoir of extract measure can be implemented; Step 2, develops status analysis to selected oil reservoir, and Main Analysis opens oil-water well situation at present; And step 3, the physical condition according to oil reservoir, it is determined that implement the extract amplitude of extract measure, extract mode, oil reservoir mean reservoir pressure maintenance these technical policies of level.
The purpose of the present invention realizes also by following technical measures:
In step 1, the ridge fault block oil reservoir that can implement extract measure should meet the following conditions: average oil-containing strip width>150 meters, strip width differential<3 in series of strata; Series of strata intrinsic permeability is differential between 2-7; Water ratio in oil well>70%.
In step 2, the application maximum Liquid output of following equation calculation block:
In formula, QLmaxFor the maximum Liquid output in oil field, unit m3/ d; JLFor fluid productivity index, unit m3/ MPa m d; IWFor injectivity index, unit m3/ MPa m d; PiwfFor strata pressure near well, MPa; PwfFor strata pressure near oil well, MPa; N: oil well number, mouth; A: oil well thickness employs coefficient.
In step 2, the maximum Liquid output of the block liquid measure contrast current with block will calculated, it is determined that extract potentiality, screening can be implemented the oil well of extract measure and can increase water filling to keep the well of reservoir pressure.
In step 3, extract amplitude is 100-300m3/ d, different oil wells need to calculate according to actual parameter and obtain the maximum Liquid output of individual well, thus comprehensively determining individual well extract amplitude; Extract mode adopts the mode of the extremely optimum liquid measure of extract step by step; Pressure maintenance level is pressure coefficient 1.0.
The reasonable extract method for ridge fault block oil reservoir in the present invention, it establishes the reservoir selection evaluation criterion of applicable extract by typical model analog result, choose rational extract technical policy, can maintain more stable moisture when improving oil well liquid measure, such that it is able to increase oil well output, realize oil reservoir ultra-high water-containing stage stable yields or slow down the target of production decline, obtaining good development effectiveness. The method can avoid the ridge unexpected extract of fault block oil reservoir oil well to cause pressure acute variation near shaft bottom, solve the problem that the ridge fault block oil reservoir ultra-high water-containing stage extracts such as oil well sudden water flooding, yield decline, whole development deleterious cause, there is operating process simplicity, feature that measure success rate is high. This invention is improve ridge fault block oil reservoir extract effect, keep oil reservoir ultra-high water-containing later stage stable yields and slow down production decline and provide a kind of new method, can effectively instruct ridge fault block oil reservoir extract in good time, reasonable, stable yield, suggestions for improvement is kept to provide technical support for ridge fault block oil reservoir ultra-high water cut stage, there is wide popularizing application prospect, significant economic and social benefits can be obtained.
Accompanying drawing explanation
Fig. 1 is the flow chart of a specific embodiment of the reasonable extract method for ridge fault block oil reservoir of the present invention;
Fig. 2 be the present invention a specific embodiment in oil field Dimensionless liquid production index productivity index curve.
Detailed description of the invention
For making the above and other purpose of the present invention, feature and advantage to become apparent, cited below particularly go out preferred embodiment, and coordinate institute's accompanying drawings, be described in detail below.
As it is shown in figure 1, the flow chart of the reasonable extract method for ridge fault block oil reservoir that Fig. 1 is the present invention.
In step 101, according to conditions such as the geologic parameter of oil reservoir and development phases, it is determined that the ridge fault block oil reservoir of extract measure can be implemented. This oil reservoir should meet the following conditions: average oil-containing strip width>150 meters, strip width differential<3 in series of strata; Series of strata intrinsic permeability is differential between 2-7; Water ratio in oil well>70%. Flow process enters into step 102.
In step 102, selected oil reservoir being developed status analysis, Main Analysis opens oil-water well situation at present, applies the maximum Liquid output of following equation calculation block:
In formula, QLmaxFor the maximum Liquid output in oil field, unit m3/ d; JLFor fluid productivity index, unit m3/ MPa m d; IWFor injectivity index, unit m3/ MPa m d; PiwfFor strata pressure near well, MPa; PwfFor strata pressure near oil well, MPa; N: oil well number, mouth; A: oil well thickness employs coefficient.
The maximum Liquid output of the block liquid measure contrast current with block that will calculate, it is determined that extract potentiality. Screening can be implemented the oil well of extract measure and can increase water filling to keep the well of reservoir pressure. Flow process enters into step 103.
In step 103, physical condition according to oil reservoir, determining the enforcement technical policy such as the extract amplitude of extract measure, extract mode, oil reservoir mean reservoir pressure maintenance level, to reach extract and do not surge, well yield rises, keep reservoir stable yield and slow down the purpose successively decreased.
The general 100-300m of extract amplitude3/ d, different oil wells need to calculate according to actual parameter and obtain the maximum Liquid output of individual well, thus comprehensively determining individual well extract amplitude; Extract mode adopts the mode of the extremely optimum liquid measure of extract step by step; Pressure maintenance level is pressure coefficient about 1.0. Flow process terminates.
The present invention is directed to ridge fault block oil reservoir ultra-high water cut stage extract measure problem encountered, by typical model extract, whether development effectiveness contrasts, and establishes the screening and assessment standard of extract, defines the extract method for ridge fault block oil reservoir. The problem that the present invention can be prevented effectively from well water rapid increase after ridge fault block oil reservoir extract, yield declines, it is possible to reduce well water climbing, keep oil reservoir overall yield stable, improve the development effectiveness of ridge fault block oil reservoir.
In a specific embodiment of the application present invention, oil field 1 is a ridge fault block oil reservoir, oil area 1.15km2, oil in place 306 �� 104T, underground viscosity of crude 5.4mPa s, average oil-containing strip width 500m in series of strata, strip width differential 2, mean permeability is 900mD, series of strata permeability grade 2.6. Oil reservoir adopts the well pattern form that low note height is adopted, average producing fluid level 561m, average individual well day liquid 144t/d, oil well average moisture content 97.6% at present.
(1) adopt liquid, productivity index curve (Fig. 2) it can be seen that reach Dimensionless liquid production index after 90% increase substantially moisture according to this oil reservoir zero dimension, it was shown that should extract in time after this oil reservoir moisture 90%. According to parameters such as strip width in these oil reservoir series of strata, permeability, oil reservoir are moisture, contrast screening criteria. This oil reservoir meets screening conditions: average oil-containing strip width>150 meters, strip width differential<3 in series of strata; Series of strata intrinsic permeability is differential between 2-7; Water ratio in oil well>70%.
(2) these series of strata being developed As-Is analysis, be computed, this reasonable Liquid output of block series of strata is 3360 sides/sky, and block Liquid output is 1096 sides/sky at present, has extract potentiality. These series of strata open current liquid measure situation and the applicable extract of hole condition of 9 mouthfuls of wells in 15 mouthfuls of oil wells.
(3) according to geology reservoir and current Developing status, extract amplitude is 100-300t/d, specifically need to calculate with moisture content relation according to the actual fluid productivity index of individual well; Extract mode be step by step extract to reasonable liquid measure; Pressure keeps level about 1.0.
After this block implements extract method, average individual well day liquid 196.5t/d at present, note 144.3t/d of average individual well day, average individual well day oil 4.7t/d, achieve good implementation result.
Claims (5)
1. for the reasonable extract method of ridge fault block oil reservoir, it is characterised in that should include for the reasonable extract method of ridge fault block oil reservoir:
Step 1, according to the geologic parameter of oil reservoir and development phase, it is determined that can implement the ridge fault block oil reservoir of extract measure;
Step 2, develops status analysis to selected oil reservoir, and Main Analysis opens oil-water well situation at present; And
Step 3, the physical condition according to oil reservoir, it is determined that implement the extract amplitude of extract measure, extract mode, oil reservoir mean reservoir pressure maintenance these technical policies of level.
2. the reasonable extract method for ridge fault block oil reservoir according to claim 1, it is characterized in that, in step 1, the ridge fault block oil reservoir that can implement extract measure should meet the following conditions: average oil-containing strip width>150 meters, strip width differential<3 in series of strata; Series of strata intrinsic permeability is differential between 2-7; Water ratio in oil well>70%.
3. the reasonable extract method for ridge fault block oil reservoir according to claim 1, it is characterised in that in step 2, applies the maximum Liquid output of following equation calculation block:
In formula, QLmaxFor the maximum Liquid output in oil field, unit m3/ d; JLFor fluid productivity index, unit m3/ MPa m d; IWFor injectivity index, unit m3/ MPa m d; PiwfFor strata pressure near well, MPa; PwfFor strata pressure near oil well, MPa; N: oil well number, mouth; A: oil well thickness employs coefficient.
4. the reasonable extract method for ridge fault block oil reservoir according to claim 3, it is characterized in that, in step 2, the maximum Liquid output of the block liquid measure contrast current with block that will calculate, determining extract potentiality, screening can be implemented the oil well of extract measure and can increase water filling to keep the well of reservoir pressure.
5. the reasonable extract method for ridge fault block oil reservoir according to claim 1, it is characterised in that in step 3, extract amplitude is 100-300m3/ d, different oil wells need to calculate according to actual parameter and obtain the maximum Liquid output of individual well, thus comprehensively determining individual well extract amplitude; Extract mode adopts the mode of the extremely optimum liquid measure of extract step by step; Pressure maintenance level is pressure coefficient 1.0.
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| CN109403961A (en) * | 2018-09-29 | 2019-03-01 | 中国石油化工股份有限公司 | Commingling production oil reservoir Dimensionless liquid production index New calculating method |
| CN110046754A (en) * | 2019-03-29 | 2019-07-23 | 中国海洋石油集团有限公司 | Latin Hypercube Sampling oil field liquid production structure optimization method, storage medium and terminal |
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Application publication date: 20160601 |