CN113153260A - Generalized apparent water absorption index calculation method suitable for general and sub-injection wells - Google Patents

Generalized apparent water absorption index calculation method suitable for general and sub-injection wells Download PDF

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Publication number
CN113153260A
CN113153260A CN202110294929.XA CN202110294929A CN113153260A CN 113153260 A CN113153260 A CN 113153260A CN 202110294929 A CN202110294929 A CN 202110294929A CN 113153260 A CN113153260 A CN 113153260A
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China
Prior art keywords
water absorption
injection
well
generalized
water
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Chinese (zh)
Inventor
盖德林
陈玲玲
刘向斌
刚振宝
刘珂君
陈文将
张世东
尹志坚
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Petrochina Co Ltd
Daqing Oilfield Co Ltd
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Petrochina Co Ltd
Daqing Oilfield Co Ltd
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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
    • E21B47/00—Survey of boreholes or wells
    • 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
    • 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
    • E21B47/00—Survey of boreholes or wells
    • E21B47/06—Measuring temperature or pressure
    • 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 invention relates to the technical field of oil extraction engineering, in particular to a calculation method of generalized apparent water absorption indexes of general and separate injection wells. The problem that the injection capacity of a well cannot be quantified by dividing the water injection quantity by the water injection pressure due to pressure head loss caused by flow limiting of a water nozzle in a separate injection well of a lower water nozzle is solved. The method comprises the steps of firstly defining the generalized apparent water absorption index, then segmenting the well according to the separate injection layer section of the well, calculating the water absorption index of each section, and then summing the apparent water absorption indexes of each section to obtain the generalized apparent water absorption index of the separate injection well. The invention has the advantages of truly reflecting the water absorption capacity of the injection well, being suitable for both the separate injection well and the general injection well, having simple and convenient practical application, providing effective foundation for subsequent optimized measure well groups and the like.

Description

Generalized apparent water absorption index calculation method suitable for general and sub-injection wells
The technical field is as follows: the invention relates to the technical field of oil extraction engineering, in particular to a calculation method of generalized apparent water absorption indexes of general and separate injection wells.
Background art: along with the development of each large oil field in the middle and later stages, matched production increasing measures are needed to increase the recovery ratio of crude oil. Before the field test of the yield-increasing measure is carried out, the reservoir characteristics of the water well are firstly evaluated, and the apparent water absorption index of the water well is an important index for evaluating the liquid absorption capacity of the water well. The current apparent water absorption index does not consider the action of a water nozzle when evaluating the separate injection well, and cannot truly reflect the liquid absorption capacity of the separate injection well.
The invention content is as follows: the invention aims to calculate the generalized apparent water absorption index of a well by utilizing data such as the type and specification of a water nozzle of a split injection well, the liquid absorption amount of a split injection section, injection pressure and the like in the well history, ensure the real evaluation of the liquid absorption capacity and the dynamic characteristics of a reservoir layer of the split injection well and provide a calculation method suitable for a general system and the generalized apparent water absorption index of the split injection well for matched production increasing measures.
The technical scheme of the invention is as follows: the calculation method comprises the following steps:
the first step is as follows: defining a generalized apparent water absorption index;
the second step is that: calculating apparent water absorption index of each separate injection segment;
the third step: and calculating the sum of the apparent water absorption indexes of the water injection layer sections to obtain the generalized apparent water absorption index.
In the first step: if a well has k water injection intervals, when k is 1, the generalized water absorption index is defined as:
Figure BDA0002983973740000011
wherein Q isiThe liquid absorption amount of the i-th section;
ΔPithe mouth loss pressure of the ith section;
p is the injection pressure of the water well;
i is the serial number of the injection allocation layer section.
In the second step: judging the type of a water nozzle for each separate injection segment, selecting a nozzle loss algorithm, and calculating the apparent water absorption index I of each separate injection segmenti：
Figure BDA0002983973740000021
Wherein Q isiObtaining the liquid suction amount of the ith section from the history of the separate injection well;
p is the injection pressure of the injection well and is obtained from the well history;
ΔPiis the mouth loss pressure of the ith segment.
The types and specifications of the water nozzles are different, and the nozzle losses are different; when no water nozzle is available, the nozzle loss is 0, and the calculated generalized apparent water absorption index is the apparent water absorption index of the general water injection well; mouth loss pressure Δ P of i-th stageiThe calculation method of (2) is as follows:
in the history data of the separate injection well, the specification D of the water nozzle of the interval taking layeriThe diameter of the steel plate is in mm,
1) and (3) damage of a common water nozzle:
Figure BDA0002983973740000022
2) the nozzle damage of the eccentric water nozzle:
Figure BDA0002983973740000023
3) loss of concentric water nozzle:
Figure BDA0002983973740000031
in the third step: calculating a generalized apparent water absorption index I:
Figure BDA0002983973740000032
wherein Q isiThe liquid absorption amount of the i-th section;
ΔPithe mouth loss pressure of the ith section;
p is the injection pressure of the water well;
i is the serial number of the injection allocation layer section.
The invention has the following advantages:
1. the data used in the method is data in the well history, the data item source is simple, and the practical application is simple and convenient;
2. the invention considers the nozzle loss of the water nozzle, and can realize the real evaluation of the injection capability of the split injection well;
3. the invention provides a novel concept and an evaluation method of a generalized visual water absorption index.
Description of the drawings: FIG. 1 is a schematic view of a dispensing well
The specific implementation mode is as follows: the invention is further described with reference to the accompanying drawings and specific embodiments, wherein the calculation method comprises the following steps:
the first step is as follows: defining a generalized apparent water absorption index;
the second step is that: calculating apparent water absorption index of each separate injection segment;
the third step: and calculating the sum of the apparent water absorption indexes of the water injection layer sections to obtain the generalized apparent water absorption index.
In the first step: if a well has k water injection intervals, when k is 1, the generalized water absorption index is defined as:
Figure BDA0002983973740000041
wherein Q isiThe liquid absorption amount of the i-th section;
ΔPithe mouth loss pressure of the ith section;
p is the injection pressure of the water well;
i is the serial number of the injection allocation layer section.
In the second step: judging the type of a water nozzle for each separate injection segment, selecting a nozzle loss algorithm, and calculating the apparent water absorption index I of each separate injection segmenti：
Figure BDA0002983973740000042
Wherein Q isiObtaining the liquid suction amount of the ith section from the history of the separate injection well;
p is the injection pressure of the injection well and is obtained from the well history;
ΔPiis the mouth loss pressure of the ith segment.
The types and specifications of the water nozzles are different, and the nozzle losses are different; when no water nozzle is available, the nozzle loss is 0, and the calculated generalized apparent water absorption index is the apparent water absorption index of the general water injection well; mouth loss pressure Δ P of i-th stageiThe calculation method of (2) is as follows:
in the history data of the separate injection well, the specification D of the water nozzle of the interval taking layeriThe diameter of the steel plate is in mm,
1) and (3) damage of a common water nozzle:
Figure BDA0002983973740000043
2) the nozzle damage of the eccentric water nozzle:
Figure BDA0002983973740000051
3) loss of concentric water nozzle:
Figure BDA0002983973740000052
in the third step: calculating a generalized apparent water absorption index I:
Figure BDA0002983973740000053
wherein Q isiThe liquid absorption amount of the i-th section;
ΔPithe mouth loss pressure of the ith section;
p is the injection pressure of the water well;
i is the serial number of the injection allocation layer section.
Selecting the history part data of a certain separate injection well of the oil field, as shown in table 1:
table 1 partial production data for injection well a
Figure BDA0002983973740000054
The first step is as follows: the generalized apparent water uptake index for the well is defined as:
Figure BDA0002983973740000055
the second step is that: calculating apparent water absorption index of each separated injection segment
Judging the type of a water nozzle for each separate injection segment, selecting a nozzle loss algorithm, and calculating the apparent water absorption index of each separate injection segment:
table 2 values of known parameters
Parameter item Parameter value
Q1 49.4
Q2 30.2
P 13.1
D1 6
D2 Is free of
The first section is eccentric water injection well choke, and water injection well choke size 60mm calculates the mouth and decreases to:
Figure BDA0002983973740000061
second stage without water nozzle and nozzle damage
ΔP2＝0
Generalized apparent water absorption index of the well
Figure BDA0002983973740000062
According to the calculation method, the following steps are known: the generalized apparent water absorption index of the well considers the influence of a water nozzle, deducts the nozzle loss delta P, and can reflect the actual water absorption capacity of a reservoir, and the larger the value is, the stronger the water absorption capacity is.
The above examples demonstrate that: the generalized apparent water absorption index of the well is calculated by defining the generalized apparent water absorption index, segmenting the well according to the separate injection intervals of the well and deducting the tip loss. The water absorption capacity of the injection well can be truly reflected by the generalized apparent water absorption index, the method is suitable for both a separate injection well and a general injection well, the practical application is simple and convenient, and an effective basis is provided for a subsequent optimized measure well group.

Claims (5)

1. A method for calculating generalized apparent water absorption indexes of general and sub-injection wells is characterized by comprising the following steps: the method comprises the following steps:
the first step is as follows: defining a generalized apparent water absorption index;
the second step is that: calculating apparent water absorption index of each separate injection segment;
the third step: and calculating the sum of the apparent water absorption indexes of the water injection layer sections to obtain the generalized apparent water absorption index.
2. The method for calculating the generalized apparent water absorption index of the adaptive general and separate injection wells according to claim 1, characterized in that: in the first step: if a well has k water injection intervals, when k is 1, the generalized water absorption index is defined as:
Figure FDA0002983973730000011
wherein Q isiThe liquid absorption amount of the i-th section;
ΔPithe mouth loss pressure of the ith section;
p is the injection pressure of the water well;
i is the serial number of the injection allocation layer section.
3. The method for calculating the generalized apparent water absorption index of the adaptive general and separate injection wells according to claim 1, characterized in that: in the second step: judging the type of a water nozzle for each separate injection segment, selecting a nozzle loss algorithm, and calculating the apparent water absorption index I of each separate injection segmenti：
Figure FDA0002983973730000012
Wherein Q isiObtaining the liquid suction amount of the ith section from the history of the separate injection well;
p is the injection pressure of the injection well and is obtained from the well history;
ΔPiis the mouth loss pressure of the ith segment.
4. The method for calculating the generalized apparent water absorption index of the adaptive general and separate injection wells according to claim 3, characterized in that: the types and specifications of the water nozzles are different, and the nozzle losses are different; when no water nozzle is available, the nozzle loss is 0, and the calculated generalized apparent water absorption index is the apparent water absorption index of the general water injection well; mouth loss pressure Δ P of i-th stageiThe calculation method of (2) is as follows:
in the history data of the separate injection well, the specification D of the water nozzle of the interval taking layeriThe diameter of the steel plate is in mm,
1) and (3) damage of a common water nozzle:
Figure FDA0002983973730000021
2) the nozzle damage of the eccentric water nozzle:
Figure FDA0002983973730000022
3) loss of concentric water nozzle:
Figure FDA0002983973730000023
5. the method for calculating the generalized apparent water absorption index of the adaptive general and separate injection wells according to claim 1, characterized in that: in the third step: calculating a generalized apparent water absorption index I:
Figure FDA0002983973730000024
wherein Q isiThe liquid absorption amount of the i-th section;
ΔPiis the ith sectionThe mouth pressure of;
p is the injection pressure of the water well;
i is the serial number of the injection allocation layer section.
CN202110294929.XA 2021-05-20 2021-05-20 Generalized apparent water absorption index calculation method suitable for general and sub-injection wells Pending CN113153260A (en)

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Publication number Priority date Publication date Assignee Title
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CN103225499A (en) * 2013-04-12 2013-07-31 中国石油天然气股份有限公司 System and method for analyzing working condition of water injection well in oil field
CN105298483A (en) * 2015-10-22 2016-02-03 中国石油天然气股份有限公司 Method and apparatus for acquiring reservoir comprehensive damage during water injection process
CN111441747A (en) * 2020-02-05 2020-07-24 中国海洋石油集团有限公司 Double-channel flow control system and method for offshore oilfield water injection well
CN112096355A (en) * 2020-08-04 2020-12-18 南京南大数字科技有限责任公司 Method for realizing intelligent separate injection by utilizing water nozzle opening degree in layered water injection

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090276100A1 (en) * 2008-05-03 2009-11-05 Sauid Arabian Oil Company System, program product, and related methods for performing automated real-time reservoir pressure estimation enabling optimized injection and production strategies
CN103225499A (en) * 2013-04-12 2013-07-31 中国石油天然气股份有限公司 System and method for analyzing working condition of water injection well in oil field
CN105298483A (en) * 2015-10-22 2016-02-03 中国石油天然气股份有限公司 Method and apparatus for acquiring reservoir comprehensive damage during water injection process
CN111441747A (en) * 2020-02-05 2020-07-24 中国海洋石油集团有限公司 Double-channel flow control system and method for offshore oilfield water injection well
CN112096355A (en) * 2020-08-04 2020-12-18 南京南大数字科技有限责任公司 Method for realizing intelligent separate injection by utilizing water nozzle opening degree in layered water injection

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Application publication date: 20210723