CN114718548A - Intelligent optimization control method for water injection of cable-controlled separate injection well - Google Patents

Intelligent optimization control method for water injection of cable-controlled separate injection well Download PDF

Info

Publication number
CN114718548A
CN114718548A CN202210246054.0A CN202210246054A CN114718548A CN 114718548 A CN114718548 A CN 114718548A CN 202210246054 A CN202210246054 A CN 202210246054A CN 114718548 A CN114718548 A CN 114718548A
Authority
CN
China
Prior art keywords
water
water injection
injection
layer
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210246054.0A
Other languages
Chinese (zh)
Inventor
白健华
刘义刚
孟祥海
陈征
蓝飞
张乐
张志雄
张玺亮
徐元德
王威
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China National Offshore Oil Corp CNOOC
CNOOC Energy Technology and Services Ltd
CNOOC China Ltd Tianjin Branch
Original Assignee
China National Offshore Oil Corp CNOOC
CNOOC Energy Technology and Services Ltd
CNOOC China Ltd Tianjin Branch
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China National Offshore Oil Corp CNOOC, CNOOC Energy Technology and Services Ltd, CNOOC China Ltd Tianjin Branch filed Critical China National Offshore Oil Corp CNOOC
Priority to CN202210246054.0A priority Critical patent/CN114718548A/en
Publication of CN114718548A publication Critical patent/CN114718548A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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 OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
    • G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
    • G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
    • G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Geophysics (AREA)
  • Evolutionary Computation (AREA)
  • Medical Informatics (AREA)
  • Software Systems (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

The invention provides an intelligent optimization control method for water injection of a cable-controlled separate injection well, which is characterized in that under the same shaft water injection pressure system, based on the monitoring of the current real-time flow of each layer, the standard reaching situation of water injection of each layer of the water injection well in the same day/month is predicted by using a judgment formula and a preset water injection qualification rate, and the process of intelligently optimizing and adjusting the single-layer water injection amount of each water injection layer according to the prediction result; the optimal regulation and control of the water injection layer are carried out, fluid dynamics numerical simulation (CFD) calculation is carried out by using an intelligent measuring and calculating system, a key parameter flow coefficient is obtained, then a fluid mechanics formula is utilized, the aims of stable water injection of each layer, standard water injection and maximization of the whole shaft water injection efficiency are taken, the pressure loss of the comprehensive water nozzle is minimized, the optimal water injection quantity and the optimal water nozzle opening value of each layer are obtained, and the intelligent regulator automatically regulates the water nozzle opening to carry out water injection to meet the requirement of optimizing the water injection quantity of each water injection layer. The stable and effective water injection is realized under the real-time monitoring, prediction, evaluation and optimization control of the whole water injection process.

Description

Intelligent optimization control method for water injection of cable-controlled separate injection well
Technical Field
The invention relates to the technical field of layered intelligent water injection, in particular to an intelligent optimization control method for water injection of a cable-controlled separate injection well.
Background
Although the conventional intelligent layered water injection technology can remotely monitor the water injection condition in real time, the opening degree of a water nozzle is adjusted, constant-current water injection is realized, the water distribution amount and the water absorption index of each layer of one water injection well are different, the layered water distribution amount is manually input, the actual water injection amount of each layer can be influenced by other layer water injection working conditions, the problems of unbalanced layered water injection effect, low water injection efficiency of the whole well and the like exist, and the real-time intelligent optimization control is lacked. There are mainly the following problems:
(1) problems are found by comparing real-time monitoring data with injection allocation data through manual monitoring and checking, problems are not fed back timely, problems are not solved timely, even the best opportunity for solving the problems is missed, and unstable water injection or worse water injection is caused. At present, whether the actual water injection condition meets the injection allocation requirement or not and whether the actual water injection condition is qualified or not is manually monitored and checked, and the problems of judgment error, partial subjectivity, large workload and the like exist.
(2) When the multi-layer injection is carried out, automatic calculation and simulation are lacked, the influence of water injection adjustment at a certain time on other water injection layers cannot be expected, and an integral real-time evaluation mechanism is lacked.
(3) When layered water injection adjustment is carried out, the opening degree of the water nozzle is manually intervened and operated, so that optimal adjustment is difficult to realize, and optimal control is difficult to realize on the water injection quantity.
(4) The method for evaluating and adjusting the water injection standard by manual measurement and calculation has the problems of complex measurement and calculation process, long time consumption, high difficulty, incomplete consideration factor, large error and the like.
Disclosure of Invention
The invention overcomes the defects in the prior art, and the prior intelligent separate layer water injection technology has the problems of judgment error, partial subjectivity, large workload, lack of an integral real-time evaluation mechanism, difficulty in realizing optimized control, complex measuring and calculating process, long time consumption, high difficulty, incomplete consideration factors and the like, and provides an intelligent optimized control method for cable-controlled separate injection well water injection, which predicts the standard reaching condition of water injection of each water injection layer in the same day/month based on the current real-time flow monitoring of each layer of the water injection well, determines whether the water injection quantity needs to be adjusted based on the specific predicted condition, and then carrying out calculation simulation and prediction according to intelligent measurement and calculation, and obtaining the optimal water injection quantity and the optimal water nozzle opening degree value of each layer of the water injection well by aiming at stable water injection of each layer, standard water injection and maximization of the water injection efficiency of the whole shaft, wherein the dispenser automatically adjusts the opening degree of the corresponding water nozzle according to the calculation result to carry out water injection. The method mainly realizes the intelligent optimized control of the water injection of the cable-controlled separate injection well by intelligently measuring and calculating the water injection result and dynamically optimizing the water injection quantity of each layer through a computer system.
The purpose of the invention is realized by the following technical scheme.
A cable-controlled separate injection well water injection intelligent optimization control method is carried out according to the following steps:
s1, selecting the qualified rate of daily water injection and the qualified rate of monthly water injection as water injection effect evaluation indexes, and predicting the standard reaching conditions of water injection at the current day and month according to the real-time water injection condition of the current water injection well to evaluate;
evaluation standard of single-layer water injection qualification rate:
single-layer daily water injection qualification rate:
Figure BDA0003544640560000021
single-layer monthly water injection qualification rate:
Figure BDA0003544640560000022
wherein i is the number of days in the month;
wherein, the error of the daily water injection amount actually measured by the single layer is within plus or minus 20 percent, namely the injection allocation is qualified;
evaluating the qualification rate of the stratified water injection:
the qualification rate of the stratified water injection is divided into the qualification rate of the stratified inspection and allocation and the qualification rate of the stratified allocation;
the qualification rate of layered inspection and distribution-the qualification rate of layered inspection and distribution refers to the ratio of the qualified layer number of the geological injection to the total testing layer number of the separate injection well when the separate injection well is used for flow test at the initial stage of throwing, fishing and distribution, and the formula is as follows:
Figure BDA0003544640560000023
in the formula: f. ofs-hierarchical qualification rate,%;
ssduring testing, the number of qualified single-layer injection layers is increased;
sztesting the total number of the separated injection layers;
sp-planning the number of stop layers, layers;
the qualified rate of layered deployment-the qualified rate of layered deployment refers to the ratio of the number of the interval of which the injected formation water quantity reaches the geological injection allocation requirement after the throwing, fishing and deployment to the total number of the intervals of the actual water injection of the oilfield injection well;
wherein, the standard of whether the layering allocation is qualified or not is as follows: when the single-layer geological injection amount is more than 15m3D, the error of the actual daily water injection amount is within +/-10 percent, namely the single-layer injection allocation is qualified; when the single-layer geological injection amount is less than or equal to 15m3D, the error of the actual daily water injection amount is within +/-15 percent, namely the single-layer injection allocation is qualified; because the small-layer water injection quantity after being prepared according to the specification is required to be qualified, namely the qualified rate of the stratified injection is 100%, the qualified rate of the stratified injection is generally the qualified rate of the stratified inspection and preparation of the separate injection well before the dropping, fishing and preparation.
S2: and according to the qualified conditions of water injection of all layers and the whole well fed back by monitoring the water injection effect of the computer system, selecting a water injection layer position to be allocated, and determining the water injection quantity to be adjusted of each layer.
S3: entering a computer intelligent measuring and calculating process, and calculating the opening value of the water outlet nozzle by the computer according to the water injection amount required to be adjusted;
calculating a flow coefficient according to numerical simulation, determining the area of a flow passage according to the flow coefficient, and finally determining the opening value of the water nozzle according to the area of the flow passage;
firstly, the process of determining the flow coefficient Cd through numerical simulation is as follows:
including but not limited to the following types of water nozzles:
setting the opening degree of a water nozzle throttling hole as x and the area of an overflowing channel as A (x) to obtain the relation between the opening degree of the water nozzle and the area of the overflowing channel, wherein a blank part represents the area of the overflowing channel, and a gray part represents the opening degree of the throttling hole as shown in a directional diagram 1a-1 f;
a.U type water tap
U type orifice water injection well choke, U type orifice water injection well choke aperture and the relationship of area of overflowing are:
Figure BDA0003544640560000031
b. diamond water nozzle
The relationship between the opening degree of the water nozzle with the rhombic throttling hole and the overflowing area is as follows:
Figure BDA0003544640560000032
c. rectangular water nozzle
The relationship between the opening degree of the water nozzle with the rectangular throttling hole and the overflowing area is as follows:
A(x)＝hx，0≤x≤l
d. circular water nozzle
The relationship between the opening degree of the water nozzle with the circular throttling hole and the overflowing area is as follows:
Figure BDA0003544640560000033
e. triangular water nozzle
The relationship between the opening degree of the triangular throttling hole water nozzle and the overflowing area is as follows:
Figure BDA0003544640560000041
f. oval water nozzle
The relationship between the opening degree of the water nozzle with the oval throttling hole and the overflowing area is as follows:
Figure BDA0003544640560000042
assuming that the flow speed is V at constant flow and the flow corresponding to different opening degrees of the U-shaped water nozzle is V
Q1＝A(x1)V，Q2＝A(x2)V，Q3＝A(x3)V，……，Qn＝A(xn) (2)
The flow coefficients corresponding to different opening degrees of the U-shaped water nozzle are as follows:
in the fluid flowing process, because the fluid is influenced by flow resistance, water injection pressure and the like, the required injection allocation amount is difficult to achieve, the injection amount needs to be continuously corrected through a flow coefficient, and the water injection precision is improved; for a water nozzle with a certain throttle hole shape and a certain flow area, the flow coefficient is a constant and can be measured through tests; but for orifice shapeThe flow coefficient is a variable value; coefficient of flow CdiCan be expressed as:
Figure BDA0003544640560000043
wherein Q isiFor the flow through the nozzle, m3D; a (xi) is the area of the water nozzle flow passage in mm2(ii) a Rho is the fluid density, kg/m3(ii) a Delta P is the pressure difference between the front and the back of the water nozzle, and is MPa;
calculating flow coefficients corresponding to different opening degrees according to formulas (2) and (3)
Figure BDA0003544640560000044
Figure BDA0003544640560000045
……
Figure BDA0003544640560000046
Secondly, according to the flow coefficient and the flow value in the intelligent measuring and calculating system, the corresponding overflowing channel area A (x) can be obtainedi)，
Figure BDA0003544640560000047
When inputting a certain flow, the system will automatically match the corresponding flow coefficient and calculate the opening x of the water outlet nozzlei；
The opening x of the water nozzle obtained according to the formulas (1) and (4) is as follows:
Figure BDA0003544640560000051
the intelligent measuring and calculating system stores the relation between different flows corresponding to different opening degrees, and when the flow is clicked to be allocated, the measuring and calculating system automatically calculates the opening degree of the water nozzle through the area of the channel according to the corresponding flow coefficient.
S4: after the water nozzle opening values of all layers are calculated, the water injection amount and the water nozzle opening values of other non-target allocation layers are calculated by utilizing a stratified water injection mechanical theory model and adopting numerical simulation, then the optimal water injection amount and the optimal water nozzle opening value which meet the conditions of all layers are screened out through the system, allocation water injection is carried out according to the optimal result, and the problem that the pressure environment is suddenly changed and the water injection of other layers is unqualified due to the fact that the water injection amount of a certain single layer or a certain plurality of layers is adjusted can be prevented through the optimal solution of intelligent measurement and calculation and simulation prediction.
FIG. 2 is a stratified water injection system with intelligent water injection distributors, which includes 3 water injection levels, each water injection level is provided with an intelligent water injection distributor, the intelligent water injection distributors are provided with an adjustable water nozzle, the water injection amount flows into the stratum through the water nozzle, and the stratified water injection system can be obtained according to the pressure balance condition of the stratified water injection system:
Figure BDA0003544640560000052
wherein, P1、P2、P3Respectively the stratum pressures of the water injection layers 1, 2 and 3, and the unit is Pa; delta PN1、△PN2、△PN3Pressure losses of water nozzles of the intelligent water distributors 1, 2 and 3 are respectively expressed in Pa; delta PT1、△PT2、△PT3Respectively the on-way resistance loss from the ground to the oil pipe of the 1 st water injection layer, the on-way resistance loss in the oil pipe between the 1 st water injection layer and the 2 rd 3 th water injection layer, and the unit is Pa; p0Injecting water pressure into the wellhead with the unit of Pa; q1、Q2、Q3The injection quantities of the water injection layers 1, 2 and 3 are respectively, and the unit is m3/s；Q0Total water injection at well head in m3/s；H1、H2、H3Respectively the distance from the ground to the 1 st water injection layer, the distance between 1-2 water injection layers and the distance between 2-3 water injection layers,the unit is m; p is the fluid density, kg/m3.
And calculating the in-oil-pipe on-way resistance. Injecting water into the vertical well and flowing vertically along the oil pipe, wherein the pressure loss in the oil pipe is calculated according to a round pipe on-way pressure loss formula, and the pressure loss from the well mouth to the first water injection layer is as follows:
Figure BDA0003544640560000061
Figure BDA0003544640560000062
in-line pressure loss in the oil pipe between the first layer and the second layer:
Figure BDA0003544640560000063
on-way pressure loss in the oil pipe between the second layer and the third layer:
Figure BDA0003544640560000064
in the above formula, Q0Total water injection at well head in m3S; lambda is a friction factor and has no factor; d is the diameter of the oil pipe, m; rho is density of injected water, kg/m3(ii) a The magnitude of the friction coefficient is related to the flow state in the oil pipe, the flow state (laminar flow and turbulent flow) in the oil pipe is judged according to the flow and the parameter variable of the flow cross section during calculation, and the on-way pressure loss of the three segmented oil pipes is calculated according to the Reynolds number;
the pressure loss of a water nozzle of a flow control valve (ICV) is a variable, the pressure loss of the water nozzle changes along with the opening degree of the water nozzle, the theoretical calculation of the flow control valve with discretely distributed flow areas is difficult, and the pressure loss of the water nozzle is calculated by a pore plate flowmeter calculation formula and the flow control valve with discretely distributed flow areas, wherein the calculation formula is as follows:
Figure BDA0003544640560000065
in the formula,. DELTA.PNThe pressure loss of the water nozzle is MPa; xi is a local resistance coefficient; rho is the fluid density, kg/m3(ii) a A is the area of the water nozzle flow passage, m; q is the flow m3D; i corresponding to horizon, Δ PNiAnd the pressure loss of the water nozzle corresponding to the layer position. The flow area of the adjustable water nozzle is changed, so the pressure loss of the water nozzle can be expressed as:
Figure BDA0003544640560000066
the local pressure loss is related to the opening of the water nozzle, i.e. the water nozzle opening value x. Therefore, the water nozzle opening position x can be read, and the water nozzle parameter corresponding to the position and the water nozzle local pressure loss corresponding to the moment can be calculated;
substituting equations (8), (9), (10), (11) and (12) into equation (6) yields the following equation
Figure BDA0003544640560000071
S5: and (4) performing optimization control on the opening degree of the water nozzle based on the pressure environment prediction of S4: simulating and calculating the water injection amount and the water nozzle opening of other layers according to the water injection amount and the water nozzle opening of the target layer to be adjusted, automatically searching an optimal solution which aims at stable water injection of each layer, standard water injection and maximization of the whole shaft water injection efficiency in the proper water injection amount and water nozzle opening, and then performing water injection allocation according to the optimal solution;
in the adjusting process, because each layer is distributed with water by the same pipe column, interference problems exist, for example, under the condition that the water injection amount and the injection pressure of a well head are not changed, the increase or the decrease of the water distribution amount and the injection pressure of a certain layer inevitably causes the change of the injection flow and the pressure of other layers, and the wellThe change of the flow in the cylinder can also cause the change of physical quantity such as on-way resistance loss, and the adjustment and change of the water injection quantity Qi and Pi value of a certain layer can cause Q1，Q2，.......，Qi-1，Qi+1,.....，QnAnd (4) redistributing the pressure in the shaft and solving and measuring the injection allocation quantity and the injection allocation pressure of each layer after adjustment by using the mass conservation and node pressure balance principle. And whether the pressure balance condition of each layer is met or not is checked in a feedback way;
the method comprises the steps that numerical simulation is utilized, injection quantity adjustment and corresponding water nozzle opening degree adjustment are simulated for a position needing to be adjusted, various parameters of the position to be adjusted, such as water injection pressure, water injection quantity and water nozzle loss pressure, are recorded, parameter change conditions and water injection condition changes of other layers which are not adjusted are recorded, optimal water injection quantity and optimal water nozzle opening degree values which have the smallest influences on water injection quantity and pressure of other non-target layers are found through multiple times of adjustment in the range of an X value and a Q value (a value measured and calculated by an intelligent measuring and calculating system), and water is injected by the system according to the optimal water injection quantity and the optimal water nozzle opening degree values;
the specific optimization control process comprises the following steps:
firstly, determining water injection quantity Q of a position needing to be regulatedi', calculating Q through intelligent measurementi', corresponding water nozzle opening value Xi';
② mixing Qi’、Xi’、Q0' (wellhead injection quantity is adjusted to Q)0’＝Q0+ delta Q, delta Q water quantity needing to be filled or filled) is substituted into a formula (13), the computer automatically calculates the filling quantity of other layers and the opening degree of the corresponding water nozzle, the system carries out water filling simulation according to the filling quantity and the opening degree of the water nozzle calculated by each layer, and the optimal filling quantity and the optimal opening degree of the water nozzle are screened from the simulation result;
the optimal injection amount and the optimal water nozzle opening degree meet the following conditions:
a: mass conservation equation (7);
b: pressure balance equation (13);
c: the daily qualification rate of water injection of each layer reaches the standard;
D：
Figure BDA0003544640560000081
and thirdly, the automatic dispenser starts to execute water injection regulation of each layer according to the optimal result measured and calculated by the system.
The invention has the beneficial effects that: the method includes the steps of predicting the current real-time flow rate of each layer of a water injection well, predicting the current day/month water injection standard reaching situation of each water injection layer, determining whether water injection quantity needs to be adjusted or not based on the specific predicted situation, then performing calculation simulation and prediction according to intelligent measurement and calculation, aiming at stable water injection of each layer, standard water injection and maximization of the whole shaft water injection efficiency, obtaining the optimal water injection quantity and the optimal water nozzle opening value of each layer of the water injection well, and automatically adjusting a dispenser to the corresponding water nozzle opening according to the calculation result to perform water injection.
Drawings
FIG. 1 is a diagram of the shape and type of a water nozzle suitable for but not limited to the invention, wherein a is a U-shaped water nozzle, b is a rhombic water nozzle, c is a rectangular water nozzle, d is a circular water nozzle, e is a triangular water nozzle, and f is an elliptical water nozzle;
FIG. 2 is a mechanical model of the multi-layer dispensing system of the present invention;
fig. 3 is an intelligent optimization control flow for water injection of a separate injection well.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
In order to really realize intelligent optimal control of water injection of the cable-controlled separate injection well, the method is provided for predicting the water injection standard reaching situation on the same day/month based on current real-time flow monitoring, determining whether the water injection amount needs to be adjusted or not based on the specific predicted situation, then carrying out calculation simulation and prediction according to intelligent measurement and calculation to obtain the optimal water injection amount and the optimal water nozzle opening value, automatically adjusting the regulator to the corresponding water nozzle opening degree according to the calculation result to carry out water injection, and realizing the intelligent optimal control of the water injection of the cable-controlled separate injection well through two functions of intelligent measurement and calculation of a computer system and feedback of water injection effect results.
An intelligent optimization control method for water injection of a cable-controlled separate injection well comprises the following specific steps:
s1: selecting the qualified rate of daily water injection and the qualified rate of monthly water injection as water injection effect evaluation indexes, and evaluating whether the current daily water injection condition and monthly water injection condition reach the standard or not;
firstly, a single-layer water injection qualification rate evaluation standard:
single-layer daily water injection qualification rate:
Figure BDA0003544640560000091
single-layer monthly water injection qualification rate:
Figure BDA0003544640560000092
wherein i is the number of days of the month.
The error of the daily water injection amount actually measured by the single layer is within +/-20 percent, and the injection allocation is qualified.
Examples are shown in Table 1:
TABLE 1 feedback of daily single-layer waterflooding effect results
Water injection layer Dosage m3/d Measured injection quantity m3/d Qualification rate of water injection Water injection effect Water injection result feedback
First layer 45 46 2.22％ Qualified Is normal
Second layer 45 34 -24.44％ Unqualified (owing) Water injection to be regulated
Third layer 40 35 -12.50％ Qualified Is normal
The fourth layer 40 41 2.50％ Qualified Is normal
The fifth layer 30 37 23.33％ Unqualified (Note) Water injection to be regulated
Evaluating the qualification rate of the stratified water injection:
and the qualification rate of the stratified water injection is divided into the qualification rate of the stratified inspection and allocation and the qualification rate of the stratified allocation.
And the qualified rate of layered inspection and distribution-the qualified rate of layered inspection and distribution refers to the ratio of the qualified number of the geological injection to the total testing number of the injection well when the injection well is subjected to flow testing at the initial stage of throwing, dragging and distribution.
The formula is as follows:
Figure BDA0003544640560000093
in the formula: f. ofs-hierarchical qualification rate,%;
ssduring testing, the number of qualified single-layer injection layers is increased;
sztesting the total number of layers to be separated;
spplanning the number of stop layers.
And the layered blending qualification rate is the ratio of the number of the interval sections of which the injected formation water quantity reaches the geological blending requirement after the throwing, fishing and blending to the total number of the interval sections of which the injected water of the oilfield separate injection well actually injects water.
The standard for whether the layered blending is qualified or not is as follows: when the single-layer geological injection amount is more than 15m3D, the error of the actual daily water injection amount is within +/-10 percent, namely the single-layer injection allocation is qualified; when the single-layer geological injection amount is less than or equal to 15m3And d, the error of the actual daily water injection amount is within +/-15 percent, and the single-layer injection allocation is qualified. Because the small-layer water injection quantity after being prepared according to the specification is required to be qualified, namely the qualified rate of the stratified injection is 100%, the qualified rate of the stratified injection is generally the qualified rate of the stratified inspection and preparation of the separate injection well before the dropping, fishing and preparation.
S2: and according to the qualified conditions of water injection of all layers and the whole well fed back by monitoring the water injection effect of the computer system, selecting a water injection layer position to be allocated, and determining the water injection quantity to be adjusted of each layer.
As shown in example table 1, the layer locations to be allocated are the second layer and the fifth layer.
Water injection layer The water injection quantity m needs to be adjusted3/d
Second layer +11
The fifth layer -7
S3: entering a computer intelligent measuring and calculating process, and calculating the opening value of the water outlet nozzle by the computer according to the water injection amount required to be adjusted.
And calculating a flow coefficient according to numerical simulation, determining the area of the overflowing channel according to the flow coefficient, and finally determining the opening value of the water nozzle according to the area of the overflowing channel.
Firstly, numerical simulation is carried out to determine a flow coefficient CdThe process is as follows:
taking a U-shaped throttling hole water nozzle as an example, setting the opening degree of the throttling hole of the water nozzle as x and the area of the overflowing channel as A (x), and obtaining the relation between the opening degree of the water nozzle and the area of the overflowing channel. Where the blank portion indicates the flow passage area and the grey portion indicates the direction of the orifice opening as shown in figure 1 a.
U type orifice water injection well choke, U type orifice water injection well choke aperture and the relationship of area of overflowing are:
Figure BDA0003544640560000101
assuming that the flow speed is V at constant flow and the flow corresponding to different opening degrees of the U-shaped water nozzle is V
Q1＝A(x1)V，Q2＝A(x2)V，Q3＝A(x3)V，……，Qn＝A(xn) (2)
The flow coefficients corresponding to different opening degrees of the U-shaped water nozzle are as follows:
in the fluid flowing process, because the fluid is influenced by flow resistance, water injection pressure and the like, the required injection allocation amount is difficult to achieve, the injection amount needs to be continuously corrected through a flow coefficient, and the water injection precision is improved. For a water nozzle with a certain shape of the throttling hole and a certain flow area, the flow coefficient is a constant and can be measured through experiments. However, for the adjustable water nozzle with the shape of the throttling hole and the changed flow area, the flow coefficient is a changed value. Coefficient of flow CdiCan be expressed as:
Figure BDA0003544640560000111
wherein Q isiFor the flow through the nozzle, m3D; a (xi) is the area of the water nozzle overflowing passage in mm2(ii) a Rho is the fluid density, kg/m3(ii) a And delta P is the pressure difference between the front and the back of the water nozzle, and is MPa.
Calculating flow coefficients corresponding to different opening degrees according to formulas (2) and (3)
Figure BDA0003544640560000112
Figure BDA0003544640560000113
……
Figure BDA0003544640560000114
Secondly, according to the flow coefficient and the flow value in the intelligent measuring and calculating system, the corresponding overflowing channel area A (x) can be obtainedi)，
Figure BDA0003544640560000115
When inputting a certain flow, the system will automatically match the corresponding flow coefficient and calculate the opening x of the water outlet nozzlei。
The opening x of the water nozzle obtained according to the formulas (1) and (4) is as follows:
Figure BDA0003544640560000116
the intelligent measuring and calculating system stores the relation between different flows corresponding to different opening degrees, and when the flow is clicked to allocate, the measuring and calculating system automatically calculates the opening degree of the water nozzle through the area of the channel according to the corresponding flow coefficient.
S4: after the water nozzle opening values of all layers are calculated, the water injection quantity and the water nozzle opening values of other non-target allocation layers are calculated by utilizing a stratified water injection mechanical theoretical model and adopting numerical simulation, then the optimal water injection quantity and the optimal water nozzle opening value which meet the conditions of all layers are screened out through the system, and allocation water injection is carried out according to the optimal result. Through the optimal solution of intelligent measurement and simulation prediction, the phenomenon that the water injection of other layers is unqualified due to sudden change of the pressure environment caused by adjusting the water injection amount of a certain single layer or a certain plurality of layers can be prevented.
FIG. 2 is a stratified water injection system with intelligent water injection mandrel, including 3 water injection horizons, an intelligent water injection mandrel is installed in every water injection layer, and an adjustable water injection well choke is equipped with to intelligent water injection mandrel, and the water injection volume flows into the stratum through the water injection well choke, can obtain according to stratified water injection system pressure balance condition:
Figure BDA0003544640560000121
wherein, P1、P2、P3Respectively the stratum pressures of the water injection layers 1, 2 and 3, and the unit is Pa; delta PN1、△PN2、△PN3Pressure losses of water nozzles of the intelligent water distributors 1, 2 and 3 are respectively expressed in Pa; delta PT1、△PT2、△PT3The on-way resistance loss from the ground to the oil pipe of the 1 st water injection layer and the oil between the 1 st to the 2 nd water injection layersLoss of on-way resistance in the pipe and loss of on-way resistance in the oil pipe between 2-3 water injection layers, wherein the unit is Pa; p0Injecting water pressure into the wellhead with the unit of Pa; q1、Q2、Q3The injection amount of the water injection layer 1, 2 and 3 respectively is m3/s；Q0Total water injection at well head in m3/s；H1、H2、H3The distance from the ground to the 1 st water injection layer, the distance between 1-2 water injection layers and the distance between 2-3 water injection layers are respectively, and the unit is m; p is the fluid density, kg/m3.
And calculating the in-oil-pipe on-way resistance. Injecting water into the vertical well and flowing vertically along the oil pipe, wherein the pressure loss in the oil pipe is calculated according to a round pipe on-way pressure loss formula, and the pressure loss from the well head to the first water injection layer is as follows:
Figure BDA0003544640560000122
Figure BDA0003544640560000123
in-line pressure loss in the oil pipe between the first layer and the second layer:
Figure BDA0003544640560000124
on-way pressure loss in the oil pipe between the second layer and the third layer:
Figure BDA0003544640560000131
in the above formula, Q0Total water injection at well head in m3S; lambda is a friction factor and has no factor; d is the diameter of the oil pipe, m; rho is density of injected water, kg/m3(ii) a The friction coefficient is related to the flow state in the oil pipe, and the flow state (laminar flow and turbulent flow) in the oil pipe is judged according to the flow and the parameter variable of the flow cross section during calculationFlow) and then calculating the on-way pressure loss of the oil pipe of the three sections according to the Reynolds number.
Flow control valve (ICV) water nozzle pressure loss. The flow coefficient is a variable, so the pressure loss of the water nozzle changes along with the opening degree of the water nozzle. There is great difficulty in using theoretical calculations for flow control valves with discrete distribution of flow areas. The pressure loss of the water nozzle is calculated by combining a calculation formula of the orifice plate flowmeter and a flow control valve with discretely distributed flow areas, wherein the calculation formula is as follows:
Figure BDA0003544640560000132
in the formula,. DELTA.PNThe pressure loss of the water nozzle is MPa; xi is a local resistance coefficient; rho is the fluid density, kg/m3(ii) a A is the area of the water nozzle overflowing channel, m; q is the flow m3D; i corresponding to horizon, Δ PNiAnd the pressure loss of the water nozzle corresponding to the layer position. The flow area of the adjustable water nozzle is changed, so the pressure loss of the water nozzle can be expressed as:
Figure BDA0003544640560000133
the local pressure loss is related to the opening of the tap, i.e. the tap opening value x. Therefore, the water nozzle opening position x can be read, and the water nozzle parameter corresponding to the position and the water nozzle local pressure loss corresponding to the moment can be calculated.
Substituting equations (8), (9), (10), (11) and (12) into equation (6) yields the following equation
Figure BDA0003544640560000141
S5: and performing optimal control on the opening degree of the water nozzle based on the pressure environment prediction of S4. And (3) simulating and calculating the water injection quantity and the water nozzle opening of other layers through the water injection quantity and the water nozzle opening which are required to be adjusted at the target layer position, automatically searching an optimal solution by a computer system in the proper water injection quantity and water nozzle opening, and then performing water injection allocation according to the optimal solution.
The specific optimization control process comprises the following steps:
determining water injection quantity Q of a position needing to be adjustedi' calculating Q through intelligent measurementi'corresponding water nozzle opening value Xi'.
② mixing Qi’、Xi’、Q0' (wellhead injection quantity is adjusted to Q)0’＝Q0+ delta Q, delta Q water quantity needing to be filled or filled) is substituted into a formula (13), the computer automatically calculates the filling quantity of other layers and the opening degree of the corresponding water nozzle, the system carries out water filling simulation according to the filling quantity and the opening degree of the water nozzle calculated by each layer, and the optimal filling quantity and the optimal opening degree of the water nozzle are screened from the simulation result;
the optimal solution satisfies the following conditions:
a: mass conservation equation (7);
b: pressure balance equation (13);
c: the daily qualification rate of water injection of each layer reaches the standard.
D：
Figure BDA0003544640560000142
And thirdly, the automatic dispenser starts to execute water injection regulation of each layer according to the optimal result measured and calculated by the system.
The method provides a new method trial and basis for realizing effective and qualified water injection and improving the recovery ratio of the cable-controlled separate injection well.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.

Claims (5)

1. A cable-controlled separate injection well water injection intelligent optimization control method is characterized by comprising the following steps: the method comprises the following steps:
s1, selecting the qualified rate of daily water injection and the qualified rate of monthly water injection as water injection effect evaluation indexes, and predicting the standard reaching conditions of water injection at the current day and month according to the real-time water injection condition of the current water injection well to evaluate;
firstly, a single-layer water injection qualification rate evaluation standard:
single-layer daily water injection qualification rate:
Figure FDA0003544640550000011
single-layer monthly water injection qualification rate:
Figure FDA0003544640550000012
wherein i is the number of days in the month;
evaluating the qualification rate of the stratified water injection:
the qualification rate of the stratified water injection is divided into the qualification rate of the stratified inspection and allocation and the qualification rate of the stratified allocation;
the qualification rate of layered inspection and distribution-the qualification rate of layered inspection and distribution refers to the ratio of the qualified layer number of the geological injection to the total testing layer number of the separate injection well when the separate injection well is used for flow test at the initial stage of throwing, fishing and distribution, and the formula is as follows:
Figure FDA0003544640550000013
in the formula: f. ofs-hierarchical qualification rate,%;
ssduring testing, the number of qualified single-layer injection layers is increased;
sztesting the total number of layers to be separated;
sp-planning to stop the number of layers, layers;
the qualified rate of layered deployment-the qualified rate of layered deployment refers to the ratio of the number of the interval of which the injected formation water quantity reaches the geological injection allocation requirement after the throwing, fishing and deployment to the total number of the intervals of the actual water injection of the oilfield injection well;
s2: according to the qualified conditions of water injection of all layers and the whole well fed back by the monitoring of the water injection effect of the computer system, selecting a water injection layer position to be allocated, and determining the water injection quantity to be adjusted of each layer;
s3: entering a computer intelligent measuring and calculating process, and calculating the opening value of the water outlet nozzle by the computer according to the water injection amount required to be adjusted;
calculating a flow coefficient according to numerical simulation, determining the area of a flow passage according to the flow coefficient, and finally determining the opening value of the water nozzle according to the area of the flow passage;
the flow coefficient Cd is determined by simulation of the value as follows:
setting the opening degree of a water nozzle throttling hole as x and the area of an overflowing channel as A (x), and obtaining the relationship between the opening degree of the water nozzle and the area of the overflowing channel as follows:
a.U type water tap
U type orifice water injection well choke, U type orifice water injection well choke aperture and the relationship of area of overflowing are:
Figure FDA0003544640550000021
b. diamond water nozzle
The relationship between the opening degree of the water nozzle with the rhombic throttling hole and the overflowing area is as follows:
Figure FDA0003544640550000022
c. rectangular water nozzle
The relationship between the opening degree of the water nozzle with the rectangular throttling hole and the overflowing area is as follows:
A(x)＝hx，0≤x≤l
d. circular water nozzle
The relationship between the opening degree of the water nozzle with the circular throttling hole and the overflowing area is as follows:
Figure FDA0003544640550000023
e. triangular water nozzle
The relationship between the opening degree of the triangular throttling hole water nozzle and the overflowing area is as follows:
Figure FDA0003544640550000024
f. oval water nozzle
The relationship between the opening degree of the water nozzle with the oval throttling hole and the overflowing area is as follows:
Figure FDA0003544640550000025
assuming that the flow speed is V during constant flow, the flow corresponding to different opening degrees of the U-shaped water nozzle is as follows:
Q1＝A(x1)V，Q2＝A(x2)V，Q3＝A(x3)V，……，Qn＝A(xn) (2)
the flow coefficients corresponding to different opening degrees of the U-shaped water nozzle are as follows:
in the fluid flowing process, because the fluid is influenced by flow resistance, water injection pressure and the like, the required injection allocation amount is difficult to achieve, the injection amount needs to be continuously corrected through a flow coefficient, and the water injection precision is improved; for a water nozzle with a certain throttle hole shape and a certain flow area, the flow coefficient is a constant and can be measured through tests; but for the adjustable water nozzle with the shape of the throttling hole and the changed flow area, the flow coefficient is a changed value; coefficient of flow CdiCan be expressed as:
Figure FDA0003544640550000031
wherein Q isiFor the flow through the nozzle, m3D; a (xi) is the area of the water nozzle flow passage in mm2(ii) a Rho is the fluid density, kg/m3(ii) a Delta P is the pressure difference between the front and the back of the water nozzle, and is MPa;
calculating flow coefficients corresponding to different opening degrees according to formulas (2) and (3):
Figure FDA0003544640550000032
Figure FDA0003544640550000033
……
Figure FDA0003544640550000034
secondly, according to the flow coefficient and the flow value in the intelligent measuring and calculating system, the corresponding overflowing channel area A (x) can be obtainedi)：
Figure FDA0003544640550000035
When inputting a certain flow, the system will automatically match the corresponding flow coefficient and calculate the opening x of the water outlet nozzlei；
The opening x of the water nozzle obtained according to the formulas (1) and (4) is as follows:
Figure FDA0003544640550000041
s4: after the water nozzle opening values of all layers are calculated, the water injection quantity and the water nozzle opening values of other non-target allocation layers are calculated by using a stratified water injection mechanical theory model and numerical simulation, then the optimal water injection quantity and the optimal water nozzle opening value which meet the conditions of all layers are screened out by a system, allocation water injection is carried out according to the optimal result, and the optimal solution of intelligent measurement and simulation prediction can prevent the pressure environment mutation caused by adjusting the water injection quantity of a certain single layer or a certain plurality of layers and the unqualified water injection of other layers;
stratified water injection system, including 3 water injection horizons, an intelligent water injection mandrel of every water injection zone installation, every intelligent water injection mandrel is equipped with an adjustable water injection well choke, and the water injection volume flows into the stratum through the water injection well choke, can according to the pressure balance condition of stratified water injection system:
Figure FDA0003544640550000042
wherein, P1、P2、P3Respectively the stratum pressures of the water injection layers 1, 2 and 3, and the unit is Pa; delta PN1、△PN2、△PN3Pressure losses of water nozzles of the intelligent water distributors 1, 2 and 3 are respectively expressed in Pa; delta PT1、△PT2、△PT3Respectively the on-way resistance loss from the ground to the oil pipe of the 1 st water injection layer, the on-way resistance loss in the oil pipe between the 1 st water injection layer and the 2 rd 3 th water injection layer, and the unit is Pa; p0Injecting water pressure into the wellhead with the unit of Pa; q1、Q2、Q3The injection quantities of the water injection layers 1, 2 and 3 are respectively, and the unit is m3/s；Q0Total water injection at well head in m3/s；H1、H2、H3The distance from the ground to the 1 st water injection layer, the distance between 1-2 water injection layers and the distance between 2-3 water injection layers are respectively, and the unit is m; p is the fluid density, kg/m3；
And (3) calculating the in-oil-pipe on-way resistance: injecting water into the vertical well and flowing vertically along the oil pipe, wherein the pressure loss in the oil pipe is calculated according to a round pipe on-way pressure loss formula, and the pressure loss from the well head to the first water injection layer is as follows:
Figure FDA0003544640550000051
Figure FDA0003544640550000052
in-line pressure loss in the oil pipe between the first layer and the second layer:
Figure FDA0003544640550000053
on-way pressure loss in the oil pipe between the second layer and the third layer:
Figure FDA0003544640550000054
in the above formula, Q0Total water injection at well head in m3S; lambda is a friction factor and has no dimension; d is the diameter of the oil pipe, m; rho is density of injected water, kg/m3(ii) a The magnitude of the friction coefficient is related to the flow state in the oil pipe, the flow state (laminar flow and turbulent flow) in the oil pipe is judged according to the flow and the parameter variable of the flow cross section during calculation, and the on-way pressure loss of the three segmented oil pipes is calculated according to the Reynolds number;
the pressure loss of a water nozzle of a flow control valve (ICV) is a variable, the pressure loss of the water nozzle changes along with the opening degree of the water nozzle, the theoretical calculation of the flow control valve with discretely distributed flow areas is difficult, and the pressure loss of the water nozzle is calculated by a pore plate flowmeter calculation formula and the flow control valve with discretely distributed flow areas, wherein the calculation formula is as follows:
Figure FDA0003544640550000055
in the formula,. DELTA.PNThe pressure loss of the water nozzle is MPa; xi is a local resistance coefficient; rho is the fluid density, kg/m3(ii) a A is the area of the water nozzle overflowing channel, m; q is the flow m3D; i corresponding to horizon, Δ PNiAnd the pressure loss of the water nozzle corresponding to the layer position. The flow area of the adjustable water nozzle is changed, so that the pressure loss of the water nozzle can be expressed as follows:
Figure FDA0003544640550000056
the local pressure loss is related to the opening of the tap, i.e. the tap opening value x. Therefore, the water nozzle opening position x can be read, and the water nozzle parameter corresponding to the position and the water nozzle local pressure loss corresponding to the moment can be calculated;
substituting equations (8), (9), (10), (11), and (12) into equation (6) yields the following equation:
Figure FDA0003544640550000061
s5: and (4) performing optimal control on the opening degree of the water nozzle based on the pressure environment prediction of S4: simulating and calculating the water injection amount and the water nozzle opening of other layers according to the water injection amount and the water nozzle opening of the target layer to be adjusted, automatically searching an optimal solution which aims at stable water injection of each layer, standard water injection and maximization of the whole shaft water injection efficiency in the proper water injection amount and water nozzle opening, and then performing water injection allocation according to the optimal solution;
in the adjusting process, because each layer is distributed with water by the same pipe column, the problem of interference exists, for example, under the condition that the water injection quantity and the injection pressure of a wellhead are not changed, the increase or the decrease of the water distribution quantity and the injection pressure of a certain layer inevitably causes the change of the injection flow quantity and the pressure of other layers, the change of the flow quantity in a shaft also causes the change of physical quantities such as resistance loss along the way, and the adjustment and the change of the water injection quantity Qi and Pi value of the certain layer cause Q1，Q2，.......，Qi-1，Qi+1,.....，QnThe pressure in the shaft is redistributed, the injection allocation quantity and the injection allocation pressure of each layer after adjustment are solved and measured by utilizing the mass conservation and node pressure balance principle, and whether the pressure balance condition of each layer is met or not is checked in a feedback way;
the method comprises the steps of simulating the injection amount adjustment and the corresponding water nozzle opening adjustment of a layer to be allocated by utilizing numerical simulation, recording various parameters of the adjusting layer, such as water injection pressure, water injection amount, water nozzle loss pressure and the like, of the adjusting layer, recording parameter change conditions and water injection condition changes of other layers which are not allocated, finding the optimal water injection amount and the optimal water nozzle opening value which have the minimum influence on the water injection amount and pressure of other non-target layers through multiple allocation in the range of an X value and a Q value (a value measured and calculated by an intelligent measuring and calculating system), and carrying out water injection by the system according to the optimal water injection amount and the optimal water nozzle opening value.
2. The intelligent optimization control method for water injection of the cable-controlled separate injection well according to claim 1, is characterized in that: in S1, the error of the measured daily injection amount of the single layer is within +/-20%, and the injection allocation is qualified.
3. The cable-controlled separate injection well water injection intelligent optimization control method according to claim 1, characterized in that: in S1, the criterion for the qualification of the layer-by-layer blending is: when the single-layer geological injection amount is more than 15m3D, the error of the actual daily injection amount is within +/-10 percent, namely the single-layer injection allocation is qualified; when the single-layer geological injection amount is less than or equal to 15m3D, the error of the actual daily water injection amount is within +/-15 percent, namely the single-layer injection allocation is qualified; because the small-layer water injection quantity after being prepared according to the specification is required to be qualified, namely the qualified rate of the stratified injection is 100%, the qualified rate of the stratified injection is generally the qualified rate of the stratified inspection and preparation of the separate injection well before the dropping, fishing and preparation.
4. The intelligent optimization control method for water injection of the cable-controlled separate injection well according to claim 1, is characterized in that: in S5, the specific optimization control process is as follows:
determining water injection quantity Q of a position needing to be adjustedi', calculating Q through intelligent measurementi', corresponding water nozzle opening value Xi';
② mixing Qi’、Xi’、Q0' (wellhead injection quantity is adjusted to Q)0’＝Q0+ delta Q, delta Q water quantity needing to be filled or filled) is substituted into a formula (13), the computer automatically calculates the filling quantity of other layers and the opening degree of the corresponding water nozzle, the system carries out water filling simulation according to the filling quantity and the opening degree of the water nozzle calculated by each layer, and the optimal filling quantity and the optimal opening degree of the water nozzle are screened from the simulation result;
and thirdly, the automatic dispenser starts to execute water injection regulation of each layer according to the optimal result measured and calculated by the system.
5. The cable-controlled separate injection well water injection intelligent optimization control method according to claim 4, characterized in that: in the second step, the optimal injection amount and the optimal water nozzle opening degree meet the following conditions:
a: mass conservation equation (7);
b: pressure balance equation (13);
c: the daily qualification rate of water injection of each layer reaches the standard;
D：
Figure FDA0003544640550000071
CN202210246054.0A 2022-03-14 2022-03-14 Intelligent optimization control method for water injection of cable-controlled separate injection well Pending CN114718548A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210246054.0A CN114718548A (en) 2022-03-14 2022-03-14 Intelligent optimization control method for water injection of cable-controlled separate injection well

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210246054.0A CN114718548A (en) 2022-03-14 2022-03-14 Intelligent optimization control method for water injection of cable-controlled separate injection well

Publications (1)

Publication Number Publication Date
CN114718548A true CN114718548A (en) 2022-07-08

Family

ID=82237242

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210246054.0A Pending CN114718548A (en) 2022-03-14 2022-03-14 Intelligent optimization control method for water injection of cable-controlled separate injection well

Country Status (1)

Country Link
CN (1) CN114718548A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN113445972A (en) * 2021-08-13 2021-09-28 西安石油大学 Method and system for determining zonal water injection testing and regulating period of tight oil reservoir

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN113445972A (en) * 2021-08-13 2021-09-28 西安石油大学 Method and system for determining zonal water injection testing and regulating period of tight oil reservoir

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
薛鸿禧: "基于智能井技术的分层注水方法研究", 中国优秀硕士学位论文全文数据库工程科技Ⅰ辑, no. 4, 15 April 2017 (2017-04-15), pages 58 - 74 *
袁涛: "注水井分层流量测试与控制技术研究", 中国优秀硕士学位论文全文数据库信息科技, no. 8, 15 August 2018 (2018-08-15), pages 3 - 49 *
郑礼鹏等: "提高分注井分层注水合格率技术研究", 石化技术, no. 7, 31 July 2019 (2019-07-31), pages 88 - 90 *

Similar Documents

Publication Publication Date Title
AU2007265695B2 (en) Method for comparing and back allocating production
CN104196506A (en) Injection and production parameter joint debugging method, device and system for SAGD single well set
KR101354973B1 (en) Unsteady flow experiment device, method of reproducing hydrograph and method of verifying HEC-RAS performance using the same
CN112836349A (en) Injection-production joint debugging intelligent decision method and system based on shaft parameters
CN104060985B (en) A kind of stratified deposit profile control and water plugging blocking agent penetration depth method of testing and system
CN104654007B (en) Ethylene supply device and flow measuring method thereof
CN108387378B (en) A kind of engine test Propellant Supply low frequency pulsating suppressing method and system
US20230358123A1 (en) Reinforcement learning-based decision optimization method of oilfield production system
CN105937375B (en) The underbalance well drilling plant and method of biphase gas and liquid flow flow segmentation real-time monitoring
CN114718548A (en) Intelligent optimization control method for water injection of cable-controlled separate injection well
CN107355200B (en) Method for improving water drive well selection by nano-micron particle dispersion system
CN111927410A (en) Well-reservoir collaborative separate injection test regulation design method
CN107035328B (en) A kind of method of controlled pressure drilling throttling back pressure control
CN111160669B (en) Multilayer stress sensitive oil reservoir fracturing water flooding well pattern and production system optimization method
RU2521245C1 (en) Control method of oil pool development
CN108375475A (en) A kind of engine gas injection experiment helium supply air distribution system
CN112096355A (en) Method for realizing intelligent separate injection by utilizing water nozzle opening degree in layered water injection
CN108457631B (en) Classified testing and allocating design method for separate injection well
CN109915125A (en) A kind of snakelike horizontal well air water, oil-water two-phase flow imitative experimental appliance and method
CN106917614B (en) Injection well downhole flow regulator, injection well downhole flow regulator water nozzle determination method and water injection string
RU2414408C2 (en) Method and regulator for operation of subterranean gas storage
CN113445972A (en) Method and system for determining zonal water injection testing and regulating period of tight oil reservoir
CN112465218B (en) Offshore thin interbed sandstone oilfield layer system division and perforation scheme optimization method
CN205858227U (en) The underbalance well drilling plant that biphase gas and liquid flow flow segmentation is monitored in real time
CN116011268A (en) Quantitative description method of dominant seepage channel

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination