CN110593831A - Leakage monitoring device and method for oilfield water injection system - Google Patents
Leakage monitoring device and method for oilfield water injection system Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 114
- 239000007924 injection Substances 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000002332 oil field water Substances 0.000 title claims abstract description 14
- 238000012806 monitoring device Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 121
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- 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
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/12—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water
- G01M3/14—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/142—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for tubes
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Abstract
The invention discloses a leakage monitoring device and method for an oil field water injection system, which comprises the following steps: the inlet flow transmitter is arranged at the water inlet of each water injection pump, the automatic valve is arranged at each water outlet of the on-site manifold to control the on-off of water in the main water injection line, each branch flow transmitter is connected with a plurality of single well pipelines, and each single well pipeline is provided with a flow automatic controller and a pressure transmitter; each water injection station and each water distribution room are provided with RTU and DTU, and entry flow transmitter, automatic valve, branch flow transmitter, flow automatic control appearance and pressure transmitter all with RTU wired or wireless communication connection, RTU and DTU communication connection, DTU passes through mobile data network and router and forms the data communication subnet with SCADA system server. The technical scheme provided by the invention can realize timely discovery, alarm and timely response to the leakage of the oilfield water injection system.
Description
Technical Field
The invention relates to the technical field of oilfield pipeline monitoring, in particular to a leakage monitoring device and method for an oilfield water injection system.
Background
The oilfield flooding is one of the important means for supplementing energy to the stratum, realizing high and stable yield and improving the oilfield recovery ratio in the oilfield development process. However, the leakage of the water injection system often occurs due to high water injection pressure, corrosion of pipe networks, equipment aging and early failure, if the leakage is not found and disposed in time, not only water sources are wasted and the environmental problem is damaged, but also nearby personnel are seriously injured, and the foundation of roads, houses and bridges is damaged or the stratum of a water injection well is damaged, so that catastrophic accidents are caused. Although the automatic or informatization monitoring and modification of water injection production is completed or is being completed in all the oil fields at present, remote data monitoring and automatic flow regulation are carried out on water injection pressure and flow, an effective method for automatically finding and alarming leakage of a water injection system in time and automatically carrying out emergency treatment does not exist, monitoring points of abnormal data are found by means of manual monitoring and analysis, then manual line patrol is informed to find the leakage points or further diagnosis is carried out on the monitoring points to determine the water leakage pipeline and close a superior valve, and finally maintenance is carried out. Because the water injection pipe network branches and is different in distance and distance, the different meters have reading errors, the fluctuation of water injection pressure and flow is not synchronous or keeps fixed time difference at each monitoring point, the setting of single-well injection allocation quantity is manually adjusted and the automatic flow stabilization of equipment is frequently adjusted, so that the fluctuation of the pressure and flow data is correlated and has no fixed rule, the front and back change of the single pressure or flow monitoring data is monitored, and general monitoring personnel cannot accurately judge whether water leakage exists directly from the monitoring data; on the other hand, many pipelines are buried underground and even covered by cement, and leakage points are not easy to find in time, so that misjudgment, miscommand and delayed disposal lead to frequent occurrence of events with enlarged events, namely, a large amount of manpower and financial resources are wasted, and production is also influenced.
Therefore, how to realize timely discovery, alarm and timely treatment of leakage of an oilfield water injection system is a problem that needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of the above, the invention provides a leakage monitoring device and method for an oil field water injection system, which can timely find, alarm and timely respond to leakage of the oil field water injection system.
In order to achieve the purpose, the invention adopts the following technical scheme:
an oil field water injection system leakage monitoring device, comprising: the system comprises an inlet flow transmitter, an automatic valve, a branch flow transmitter, a flow automatic controller and a pressure transmitter;
the inlet flow transmitter is arranged at the water inlet of each water injection pump; the automatic valve is arranged at each water outlet of the on-site manifold and used for controlling the on-off of water in a main water injection line, each branch flow transmitter is connected with a plurality of single well pipelines, and each single well pipeline is provided with a flow automatic controller and a pressure transmitter;
each water injection station and each water distribution room all are provided with RTU and DTU, just entry flow transmitter the automatic valve branch line flow transmitter flow automatic control appearance with pressure transmitter all with the wired or wireless communication of RTU is connected, RTU with communication connection exists between the DTU, the DTU passes through mobile data network and router and forms the data communication subnet with SCADA system server, realizes that various instructions are assigned and data upload.
Preferably, the inlet flow transmitter, the spur flow transmitter and the pressure transmitter are all intelligent transmitters.
Preferably, the automatic valve includes: the valve controller is connected with the valve opening and closing piece and is in communication connection with the RTU.
Preferably, the flow automatic controller is used for receiving an instruction issued by the RTU to close or open the valve and automatically controlling the valve to be stabilized near the specified daily injection amount.
Preferably, the SCADA system server and the router are both located in an oil recovery management area.
A method for monitoring leakage of an oilfield flooding system comprises the following steps: a water injection main line leakage monitoring method and a single well leakage monitoring method;
the method for monitoring the leakage of the water injection main line comprises the following steps:
11) acquiring a series of instantaneous flow data of each inlet flow transmitter and each branch flow transmitter, and calculating inlet total instantaneous flow and outlet total instantaneous flow;
12) respectively taking N1 inlet total instantaneous flows and outlet total instantaneous flows at different continuous time, and correspondingly calculating the arithmetic mean q of the inlet total instantaneous flowsaiAnd the arithmetic mean q of the total instantaneous flow at the outletaoAfter reaching the N2 sets of arithmetic mean values, the respective standard deviations S of the arithmetic mean value of the total inlet instantaneous flow and the arithmetic mean value of the total outlet instantaneous flow are calculatediAnd SoAnd using + -3S rule to eliminate abnormal value and recalculating qai、qaoAnd the difference q thereofdUntil N2 q are obtainedd(ii) a Wherein q isd＝qai-qao；
13) Calculate N2 qdAverage value of (2)And standard deviation Sd；
14) Based on the mean valueAnd standard deviation SdSetting a leakage alarm threshold qTAnd a leakage warning value qG：
qG＝0.667qT
15) During monitoring, N1 inlet instantaneous flows and outlet instantaneous flows are collected each time, and a q value is obtained by using the same calculation method in the step 12)d；
16) Q is to bedAnd a leakage warning value qGFor comparison, if there are 2 times q within 3 consecutive timesdGreater than qGIf so, sending out an early warning to prompt monitoring personnel to find out and eliminate abnormal reasons;
q is to bedAnd a leakage alarm threshold qTBy comparison, when q isdGreater than qTWhen the water is filled, the monitor gives out a leakage alarm and waits for a monitoring person to confirm whether the automatic valve of the inlet of the water filling main line is closed;
the single well leakage monitoring method comprises the following steps:
21) acquiring a water injection indication curve p-Q curve of the water injection well to obtain an analytic expression p ═ kQ + p0(ii) a Wherein, k, p0Is a constant;
22) setting a leakage alarm control line according to the maximum allowable error percentage a% of water injection: p ═ (k-a%) Q + p0；
23) Converting the current normal single-well water injection flow Q into the actual daily injection quantity Q, substituting the actual daily injection quantity Q into a leakage alarm control line to obtain an alarm pressure pA；
24) During pressure monitoring, the actual pressure p is first less than pAIf so, sending out single well leakage early warning, and displaying the number of the leakage well according to the single well data address; when p is again less than pAAnd then sending out a single-well leakage alarm and waiting for a monitoring person to confirm whether to close the valve of the flow automatic controller or not.
Preferably, when the inlet flow transmitter and/or the branch flow transmitter is recalibrated or replaced, or the accuracy of the inlet flow transmitter and/or the branch flow transmitter gradually changes to cause false alarm and no leakage is confirmed to occur, the steps 11) to 14) are repeated to refresh the leakage alarm threshold qTAnd a leakage warning value qG。
Preferably, after water leakage is confirmed, a closing instruction is transmitted to the flow automatic controller to automatically close the valve, and otherwise, a water injection indication curve and a leakage alarm control line are refreshed.
Preferably, N1-5 and N2-25.
According to the technical scheme, compared with the prior art, the leakage monitoring device and method for the oilfield water injection system are disclosed, data of the inlet flow transmitter, the branch flow transmitter and the pressure transmitter are collected and compared with the set alarm line or the preset early warning line, leakage early warning or alarm reminding is sent out, after a monitoring person eliminates early warning or alarm caused by instrument error and confirms leakage, the valve is closed through an instruction to stop water injection, and oilfield development safety is guaranteed.
The invention can realize timely discovery, alarm and timely response of leakage of the oilfield water injection system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic view of an oilfield flooding system leak monitoring apparatus provided by the present invention;
FIG. 2 is a flow chart of a method for monitoring leakage of a main water injection line according to the present invention;
FIG. 3 is a flow chart of a single well leak monitoring method provided by the present invention;
FIG. 4 is a schematic diagram of a single well water injection indication curve and an alarm line provided by the invention.
1. An inlet flow transmitter; 2. a pressure transmitter; 3. a flow automatic control instrument; 4. an automatic valve; 5. RTU; 6. a DTU; 7. a SCADA system server; 8. and a branch flow transmitter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached drawing 1, the embodiment of the invention discloses a leakage monitoring device for an oilfield flooding system, which comprises: the system comprises an inlet flow transmitter 1, an automatic valve 4, a branch flow transmitter 8, a flow automatic controller 3 and a pressure transmitter 2;
the inlet flow transmitter 1 is arranged at the water inlet of each water injection pump and is connected with a manifold through the water injection pump; the automatic valve is arranged at each water outlet of the on-site manifold to control the on-off of water in the main water injection line, the automatic valve 4 is connected with a branch flow transmitter 8 at the water distribution station through the main water injection line, each branch flow transmitter 8 is connected with a plurality of single well pipelines, and each single well pipeline is provided with a flow automatic controller 3 and a pressure transmitter 2; wherein, a plurality of water injection pumps are arranged in a water injection station in parallel;
each water injection station and each water distribution room all are provided with RTU5 and DTU6, and entry flow transmitter 1, automatic valve 4, branch flow transmitter 8, flow automatic control appearance 3 and pressure transmitter 2 all with RTU5 wired or wireless communication connection, there is communication connection between RTU5 and DTU6, DTU6 forms the data communication subnet through mobile data network and router and SCADA system server 7, realize that various orders are assigned and data upload.
In practical implementation, the inlet flow transmitter 1 and the branch flow transmitter 8 adopt different names to represent different positions, are actually used for metering the instantaneous flow and the accumulated flow of the pipeline water, are communicated with the RTU5 arranged in a water injection station or a water distribution room, and upload measured values, and can adopt wired communication when the distance between the two is short, or can adopt wireless communication when the distance is long. However, in the specific implementation, the inlet flow transmitter and the branch flow transmitter are different due to the difference of pipe diameter and flow.
The pressure transmitter 2 is used for measuring the instantaneous pressure of the water in the pipeline, is communicated with the RTU5 in the water distribution room and uploads the instantaneous pressure value, and similarly, the instantaneous pressure value can be in wired communication or wireless communication.
The automatic valve 4, preferably but not limited to an electric valve, is provided with a valve controller that can communicate with the RTU5 provided in the water injection station to perform the water supply and cut off the water supply functions.
The RTU5 realizes data acquisition of on-site (water injection station or water distribution station) instruments (an inlet flow transmitter 1, a branch flow transmitter 8, a pressure transmitter 2 and the like) and converts the data into a format suitable for serial communication, and can also convert data sent by superior equipment into instructions to control each action execution equipment (such as an automatic valve 4 or a flow automatic controller 3) to execute.
The DTU6 is used for converting serial port data into IP data or converting the IP data into serial port data, realizing wireless data communication between each water distribution room and each water injection station and the oil extraction management area through a mobile data communication network, uploading test data to the SCADA data server 7 and issuing alarm information and instruction data of the SCADA data server 7 to the field RTU 5.
The flow automatic controller 3 comprises an automatic valve and a flow transmitter, can automatically adjust the water injection amount to be close to the set daily injection amount, at least can upload the instantaneous flow to the water distribution room RTU5, and can also receive the instruction of the water distribution room RTU5 to close the valve. Here, the flow rate controller is an intelligent flow rate controller that organically integrates a flow rate transmitter, a flow rate control valve, an intelligent controller, and a communication technology.
The SCADA system server 7 realizes calculation and judgment of various data, and issuing of alarm information and instruction data, so that leakage monitoring is realized. The SCADA system server 7 and the router are both located in the oil production management area.
In addition, the embodiment of the invention also discloses a leakage monitoring method for the oilfield water injection system, which comprises the following steps: a water injection main line leakage monitoring method and a single well leakage monitoring method, which are respectively shown in the attached figures 2 and 3:
referring to fig. 2, the method for monitoring leakage of a water injection main line comprises the following steps:
11) acquiring instantaneous flow data of each inlet flow transmitter and each branch flow transmitter, and calculating inlet total instantaneous flow and outlet total instantaneous flow;
12) respectively taking N1 inlet total instantaneous flows and outlet total instantaneous flows at different continuous time points, and calculating the arithmetic mean value q of the inlet total instantaneous flowsaiAnd the arithmetic mean q of the total instantaneous flow at the outletaoAfter reaching the N2 sets of arithmetic mean values, the respective standard deviations S of the arithmetic mean value of the total inlet instantaneous flow and the arithmetic mean value of the total outlet instantaneous flow are calculatediAnd SoAnd using + -3S rule to eliminate abnormal value and recalculating qai、qaoAnd the difference q thereofdUntil N2 q are obtainedd(ii) a Wherein q isd＝qai-qao；
13) Calculate N2 qdAverage value of (2)And standard deviation Sd；
14) Based on the mean valueAnd standard deviation SdSetting a leakage alarm threshold qTAnd a leakage warning value qG：
qG＝0.667qT
15) During monitoring, N1 inlet instantaneous flows and outlet instantaneous flows are collected each time, and a q value is obtained by using the same calculation method in the step 12)d；
16) Q is to bedAnd a leakage warning value qGFor comparison, if there are 2 times q within 3 consecutive timesdGreater than qGIf so, sending out an early warning to prompt monitoring personnel to find out and eliminate abnormal reasons; if not, then q is addeddAnd a leakage alarm threshold qTBy comparison, when q isdGreater than qTIn time, the monitor issues a leak alarm and waits for the monitoring personnel to confirm whether to close the inlet of the main water injection lineAnd (4) a valve.
The single well leakage monitoring method comprises the following steps:
25) changing daily injection allocation amount of the flow automatic control instrument, obtaining a plurality of water injection pressures p and corresponding daily injection allocation amounts Q before and after an original daily injection allocation point to obtain a plurality of groups of (p, Q) values, fitting a water injection indication curve p-Q curve of a water injection well, and obtaining an analytic expression p ═ kQ + p0(ii) a Wherein, k, p0Is a constant;
26) setting a leakage alarm control line according to the maximum allowable error percentage a% of water injection: p ═ (k-a%) Q + p0；
27) Converting the current normal single-well water injection flow Q into the actual daily injection quantity Q, substituting the actual daily injection quantity Q into a leakage alarm control line to obtain an alarm pressure pA；
28) During pressure monitoring, the actual pressure p is first less than pAIf so, sending out single well leakage early warning, and displaying the number of the leakage well according to the single well data address; when p is again less than pAAnd then sending out a single-well leakage alarm and waiting for a monitoring person to confirm whether to close the valve of the flow automatic controller or not.
In order to further optimize the technical scheme, when the inlet flow transmitter and/or the branch flow transmitter are recalibrated or replaced, or the accuracy of the inlet flow transmitter and/or the branch flow transmitter gradually changes to cause false alarm and no leakage is confirmed to occur, the steps 11) to 14) are repeated to refresh the leakage alarm threshold qTAnd a leakage warning value qG。
In order to further optimize the technical scheme, after water leakage is confirmed, a closing instruction is transmitted to the flow automatic controller to automatically close the valve, and otherwise, a water injection indication curve and a leakage alarm control line are refreshed.
In order to further optimize the technical scheme, N1 is 5, and N2 is 25.
The leakage monitoring method of the water injection main line and the leakage monitoring method of the single well provided by the invention are further explained by combining specific examples. For convenience of description, it is assumed that the water injection mains is provided with inlet flow transmitters m and outlet flow transmitters j, numbered i1 to im and o1 to oj, respectively. The trunk line leakage monitoring and early warning processing method comprises the following steps:
1. the SCADA system server 7 synchronously collects the instantaneous flow of each inlet and outlet of the water injection pipe network, and obtains the instantaneous flow data of the next sequence (collecting each time n is more than or equal to 130) under the current working condition (the working conditions that the pipe network is unchanged, a detection instrument is accurate and unchanged, the water injection amount of a single well is unchanged, and no leakage exists). Instantaneous flow data are sequentially intercepted for 5 times and divided into 1 group, so more than 25 groups of data are predicted.
2. Each group respectively calculates the arithmetic mean value q of the instantaneous total flow of each flow transmitter at the water inlet and the water outlet of the water injection pumpai、qao(subscript a denotes arithmetic mean, i denotes inlet, o denotes outlet, the same applies hereinafter) and the difference q thereofd. The specific method and calculation are as follows:
1) calculating instantaneous 5 times total flow q of all flow transmitters at inletit1、qit2、…、qit5And 5 times of instantaneous total flow q of all-flow transmitter at outletot1、qot2、…、qot5Namely:
inlet 5 instantaneous total flows: q. q.sitn＝qi1n+qi2n+…+qimnAnd n is 1 to 5.
Outlet 5 instantaneous total flows: q. q.sotn＝qo1n+qo2n+…+qojnAnd n is 1 to 5.
In the formula, the right side q of the equationkn(k ═ i1, i2, …, im, o1, o2, …, oj) represents the kth flow transmitter synchronous reading.
2) Calculating an arithmetic mean q of the sum of the instantaneous inlet and outlet flowsai、qaoAnd standard deviation S thereofi、SoAnd the arithmetic mean difference q of the sum of the instantaneous inlet and outlet flowsd。
qd＝qai-qao
3) Each group respectively corresponding to the sum q of the instantaneous inlet flowsitnAnd sum q of instantaneous flow at the outletotnData utilization qai±3SiAnd q isao±3SiJudging whether abnormal data exists, if so, removing the abnormal data at the moment, supplementing the data of the next time, and repeating the calculation of 2).
4) Obtaining the next 5 times of data, and repeating the calculation of 1), 2) and 3) until obtaining the arithmetic mean difference q of the sum of 25 groups of inlet and outlet instantaneous flowsdAnd (4) data. Suppose the data number is qd1,qd2,qd3,......，qd25；
5) Calculating the arithmetic mean difference q of the sum of the instantaneous inlet and outlet flowsdArithmetic mean and standard deviation of Sd. Namely:
6) calculating a leakage alarm threshold qT：
7) Leakage early warning value qGIs set to 2qT/3：qG＝0.667qT
3. In the subsequent continuous monitoring process, the latest continuous 5-time instantaneous flow of each flow transmitter of the inlet trunk and each flow transmitter of the outlet trunk in the server are synchronously obtained or inquired, and the total instantaneous flow of each flow transmitter of the inlet and the total instantaneous flow of each flow transmitter of the outlet are respectively calculatedAverage flow qai、qao，And calculating the average flow difference q between the total instantaneous flow at the inlet and the total instantaneous flow at the outletdDisplayed and saved.
4. Q is to bedAnd a leakage alarm threshold qGFor comparison, q is 2 times out of 3 consecutive timesdGreater than qGAnd sending out early warning prompt. After the early warning, the monitoring personnel should command and investigate the abnormal reasons, such as: whether there is leakage, whether there is misalignment of the flow transmitter, whether the flow transmitter has been replaced, etc.
5. Q is to bedAnd a leakage alarm threshold qTBy comparison, when q isdGreater than qTWhen the water is required to be filled, the monitor sends out a leakage alarm and inquires whether an inlet valve of a water filling main line needs to be closed or not to wait for confirmation of a monitoring person. If the monitoring personnel confirm that the leakage occurs and agree to close the inlet valve, the inlet valve of the water injection main line is closed according to the program, otherwise, the monitoring personnel suspend alarming, continue water supply, and cancel the alarming after finding out and eliminating the reason causing the flow difference.
6. Considering that the accuracy of the flow transmitter may be deteriorated after the flow transmitter is used for a period of time, and the alarm threshold value is changed if the flow transmitter needs to be calibrated again or a new meter needs to be replaced, the steps 1 and 2 should be repeated at certain intervals or after the change of the flow transmitter is known, and the alarm threshold value is refreshed. The refresh should be performed when it is confirmed that no leak has occurred.
The single well pipeline leakage can be judged according to the stability of the water injection indication curve in a single well short term. The water injection indication curve of the water injection well reflects the relation curve of the injection pressure p of each single water injection layer or the whole water injection well and the daily injection quantity Q. The single well enters a stable water injection period after water injection for a few days, a water injection indicating curve is approximate to a straight line or consists of two broken lines near a set injection amount, the slope of each straight line reflects the apparent water absorption index of the stratum, if the slope of the straight line is reduced, after the faults of a ground pressure and flow instrument are eliminated, the pipeline leakage or water absorption capacity mutation of a water injection layer is shown, a proper method is adopted for distinguishing, whether leakage exists or not can be determined, and control measures are adopted.
FIG. 3 is a flow chart of a single well pipeline leak determination and control method provided by the present invention, comprising the steps of:
1. obtaining a water injection indication curve of a water injection well: p-Q curve, the following two methods can be used:
the method comprises the following steps: and (5) manually testing. The water distribution station generally requires that a water injection indication curve is manually tested every month, and an analytic expression p of a straight line where daily injection quantity is located is selected to be kQ + p by using the recently measured water injection indication curve0As an initial monitoring line.
The second method comprises the following steps: referring to the attached figure 4, a new water injection indication curve p is obtained by adopting a 5-point method for remote automatic test0. The specific method comprises the following steps: the remote control flow automatic controller at the server end of the oil production management area obtains at least 5 different injection quantities Q (unit: m)3Water injection pressure p under/d) (unit: MPa) and instantaneous flow rate q (unit: m is3H), that is, in addition to (p, q) obtained at the current daily dosage point, the amounts of the ingredients measured at less-than-daily dosage (p1, q1), (p2, q2) and more-than-daily dosage (p4, q4), (p5, q5) (note: if the daily dosage is not allowed to be increased due to too large water injection pressure, the dosage of 3 or 4 points can be all less than Q at the measuring pointd). The points (note that the instantaneous flow is converted into daily injection quantity) can be fitted by utilizing mature least square method software to obtain a straight line analytic expression or a broken line formed by another straight line analytic expression, namely a water injection indicating curve, (p, Q)d) Must be near one of the fitted lines, and assume its analytic formula as p ═ kQ + p0。
2. And setting a leakage alarm control line according to the maximum allowable error of the water injection flow (such as + 2% of the current actual daily injection quantity Q), and referring to the attached figure 4. The lower leakage alarm control line can be obtained as follows:
p＝(k-2％)Q+p0or p ═ 24 (k-2%) q + p0
3. The monitoring application software uniformly sends out an instruction to upload the current instantaneous flow q and pressure p of single-well water injection, q is substituted into a control line analytic expression to obtain the alarm pressure pA；
4. If p is less than pAIf yes, sending out single well leakage alarm, displaying leakage well number according to single well data address, inquiring whether need to close valve of flow self-controller 3, waitingAnd (5) confirming by monitoring personnel. If the monitoring personnel confirm that the indication of the non-instrument is not accurate, but single well leakage occurs and the inlet valve is closed, the valve of the flow automatic controller 3 is closed, otherwise, the monitoring personnel suspend alarming, continue water supply, and cancel alarming after finding out and eliminating the reason causing the flow difference.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides an oil field water injection system leakage monitoring device which characterized in that includes: the system comprises an inlet flow transmitter, an automatic valve, a branch flow transmitter, a flow automatic controller and a pressure transmitter;
the inlet flow transmitter is arranged at the water inlet of each water injection pump; the automatic valve is arranged at each water outlet of the on-site manifold and used for controlling the on-off of water in a main water injection line, each branch flow transmitter is connected with a plurality of single well pipelines, and each single well pipeline is provided with a flow automatic controller and a pressure transmitter;
each water injection station and each water distribution room all are provided with RTU and DTU, just entry flow transmitter the automatic valve branch line flow transmitter flow automatic control appearance with pressure transmitter all with the wired or wireless communication of RTU is connected, RTU with communication connection exists between the DTU, the DTU passes through mobile data network and router and forms the data communication subnet with SCADA system server, realizes that various instructions are assigned and data upload.
2. The oilfield flooding system leakage monitoring device of claim 1 wherein the inlet flow transmitter, the spur flow transmitter and the pressure transmitter are all intelligent transmitters.
3. The oilfield flooding system leakage monitoring device of claim 1, wherein the automatic valve comprises: the valve controller is connected with the valve opening and closing piece and is in communication connection with the RTU.
4. The oilfield flooding system leakage monitoring device of claim 1, wherein the flow autonomous controller is configured to receive an instruction from the RTU to close or open the valve and automatically control the valve to stabilize near a specified daily injection amount.
5. A leakage monitoring method for an oilfield flooding system is characterized by comprising the following steps: a water injection main line leakage monitoring method and a single well leakage monitoring method;
the method for monitoring the leakage of the water injection main line comprises the following steps:
11) acquiring a series of instantaneous flow data of each inlet flow transmitter and each branch flow transmitter, and calculating inlet total instantaneous flow and outlet total instantaneous flow;
12) respectively taking N1 inlet total instantaneous flows and outlet total instantaneous flows at different continuous time, and correspondingly calculating the arithmetic mean q of the inlet total instantaneous flowsaiAnd the arithmetic mean q of the total instantaneous flow at the outletaoAfter reaching the N2 sets of arithmetic mean values, the respective standard deviations S of the arithmetic mean value of the total inlet instantaneous flow and the arithmetic mean value of the total outlet instantaneous flow are calculatediAnd SoAnd using + -3S rule to eliminate abnormal value and recalculateqai、qaoAnd the difference q thereofdUntil N2 q are obtainedd(ii) a Wherein q isd＝qai-qao；
13) Calculate N2 qdAverage value of (2)And standard deviation Sd；
14) Based on the mean valueAnd standard deviation SdSetting a leakage alarm threshold qTAnd a leakage warning value qG：
qG＝0.667qT
15) During monitoring, N1 inlet instantaneous flows and outlet instantaneous flows are collected each time, and a q value is obtained by using the same calculation method in the step 12)d；
16) Q is to bedAnd a leakage warning value qGFor comparison, if there are 2 times q within 3 consecutive timesdGreater than qGIf so, sending out an early warning to prompt monitoring personnel to find out and eliminate abnormal reasons;
q is to bedAnd a leakage alarm threshold qTBy comparison, when q isdGreater than qTWhen the water is filled, the monitor gives out a leakage alarm and waits for a monitoring person to confirm whether the automatic valve of the inlet of the water filling main line is closed;
the single well leakage monitoring method comprises the following steps:
21) acquiring a water injection indication curve p-Q curve of the water injection well to obtain an analytic expression p ═ kQ + p0(ii) a Wherein, k, p0Is a constant;
22) setting a leakage alarm control line according to the maximum allowable error percentage a% of water injection: p ═ (k-a%) Q + p0；
23) Converting the current normal single-well water injection flow Q into the actual daily injection quantity Q and substituting the actual daily injection quantity Q into the leakage reportAlarm control line for obtaining alarm pressure pA；
24) During pressure monitoring, the actual pressure p is first less than pAIf so, sending out single well leakage early warning, and displaying the number of the leakage well according to the single well data address; when p is again less than pAAnd then sending out a single-well leakage alarm and waiting for a monitoring person to confirm whether to close the valve of the flow automatic controller or not.
6. The method for monitoring the leakage of the oilfield flooding system of claim 5, wherein the steps 11) -14) are repeated to refresh the leakage alarm threshold q when the inlet flow transmitter and/or the branch flow transmitter is recalibrated or replaced, or the inlet flow transmitter and/or the branch flow transmitter have a gradually changed accuracy to cause a false alarm and no leakage is determined to occurTAnd a leakage warning value qG。
7. The method of claim 5, wherein after water leakage is detected, a closing command is transmitted to the flow controller to automatically close the valve, otherwise, a water injection indication curve and a leakage alarm control line are refreshed.
8. The method for monitoring the leakage of the oilfield water injection system according to claim 5, wherein N1-5 and N2-25.
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