CN109538190A - Rod-pumped well roofbolt stress method for early warning - Google Patents
Rod-pumped well roofbolt stress method for early warning Download PDFInfo
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- CN109538190A CN109538190A CN201710870117.9A CN201710870117A CN109538190A CN 109538190 A CN109538190 A CN 109538190A CN 201710870117 A CN201710870117 A CN 201710870117A CN 109538190 A CN109538190 A CN 109538190A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/008—Monitoring of down-hole pump systems, e.g. for the detection of "pumped-off" conditions
- E21B47/009—Monitoring of walking-beam pump systems
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- Environmental & Geological Engineering (AREA)
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- Geochemistry & Mineralogy (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The present invention provides a kind of rod-pumped well roofbolt stress method for early warning, which includes: step 1, acquires oil well associated production parameter；Step 2, maximum reduced stress is calculated according to oil well associated production parameter；Step 3, maximum reduced stress is judged and is alarmed according to the roofbolt stress early-warning parameters that Early-warning Model is arranged；Step 4, administrative staff are disposed rod-pumped well after receiving warning message, it is made to return to normal production.The rod-pumped well roofbolt stress method for early warning combines roofbolt calculation method for stress with the four change systems at scene, realizes the intelligent early-warning function to pumping unit roofbolt stress, to reduce the generation of the disconnected well of lying of bar.
Description
Technical field
The present invention relates to Oil-Gas Field Development Engineering technical fields, especially relate to a kind of rod-pumped well roofbolt stress early warning
Method.
Background technique
Sucker rod pumping is most important oil production method during oil field development, and the disconnected well of lying of bar is to lead to rod pumped well
It lies the most important factor of well, accounts for the 30.2% of total failed well number.
The effect that rod string is corroded by asymmetric cyclic loading and well liquid, failure mode are mainly shown as that fatigue is disconnected
It splits or fatigue corrosion fracture.No matter which kind of failure mode, the disconnected substantially reduced stress of bar is greater than allowable stress.And it converts and answers
Power major influence factors have two o'clock: first is that production load is excessive, oil well paraffinication unreasonable mainly due to operating condition, back pressure are excessively high
Factor, leading to reduced stress is more than that allowable stress generation bar is disconnected.Second is that being influenced by burn into eccentric wear factor, sucker rod cross section subtracts
Small, corresponding reduced stress becomes larger, until overstressing production causes bar disconnected.
Four change systems obtained popularity and application in recent years, the system using sensor, network implementations to pumping unit
The real-time acquisition and transmission of the parameters such as well polished rod load, liquid measure, pressure, electric current, voltage.Depending merely on the four changes system cannot achieve bar
The function of disconnected early warning, therefore a kind of roofbolt stress method for early warning is urgently developed, realize the function of the disconnected early warning of bar.
Summary of the invention
Roofbolt calculation method for stress is combined with the four change systems at scene the object of the present invention is to provide a kind of, realization pair
The intelligent early-warning function of pumping unit roofbolt stress, to reduce the pre- police of rod-pumped well roofbolt stress of the generation of the disconnected well of lying of bar
Method.
The purpose of the present invention can be achieved by the following technical measures: rod-pumped well roofbolt stress method for early warning, the oil pumping
Motor-pumped well roofbolt stress method for early warning includes: step 1, acquires oil well associated production parameter；Step 2, joined according to oil well associated production
Number calculates maximum reduced stress；Step 3, maximum reduced stress is judged and is reported according to the roofbolt stress early-warning parameters of setting
It is alert；Step 4, administrative staff are disposed rod-pumped well after receiving warning message, it is made to return to normal production.
The purpose of the present invention can be also achieved by the following technical measures:
In step 1, the oil well associated production parameter of acquisition includes sucker rod maximum load, minimum load, and sucker rod is horizontal
Sectional area.
In step 2, maximum reduced stress calculation formula are as follows:
In formula, fr--- --- sucker rod cross-sectional area；Pmax----maximum polished rod load；Pmin----minimum polished rod load.
In step 3, roofbolt stress early-warning parameters include allowable stress limiting threshold value and maximum reduced stress value.
In step 3, bar will be repaired according to sucker rod frequency of usage and is divided into one to level Four, in combination with the corruption of each well
Erosion, eccentric wear, pit shaft situation set new bar and repair the different allowable stress limiting threshold values of bar.
In step 3, the limiting threshold value of new bar is 100MPa, and the limiting threshold value that level-one repairs bar is 95MPa, second level reparation
The limiting threshold value of bar is 90MPa, and the limiting threshold value that three-level repairs bar is 85MPa, and the limiting threshold value that level Four repairs bar is 80MPa,
Have a well of burn into eccentric wear situation, limiting threshold value multiplied by 0.8-1.0 coefficient.
In step 3, sucker rod breaks risk in the case where being lower than limiting threshold value there are still bar, therefore three-level early warning is arranged
Mechanism carries out different grades of early warning according to the degree of reduced stress close to limiting threshold value.
In step 3, level-one early warning be > limiting threshold value 70%, coping mechanism be encryption observation；Second level early warning is > pole
The 80% of threshold value is limited, coping mechanism is to be pre-processed, including adjust manufacturing parameter, hot-washing wax remover load down；Three-level early warning is >
The 90% of limiting threshold value, coping mechanism are hard stop, analysis and improvement.
In step 3, be arranged maximum reduced stress persistently rise, ascendant trend early warning.
In step 3, it sets in 6 hour period, reduced stress persistently rises, and early warning or within 48 hours conversion are answered
Fluctuation rises then early warning.
Rod-pumped well roofbolt stress method for early warning in the present invention, on the basis of researching and analysing rod parting essence,
For innovation and application with the reduced stress calculation formula of correction, building oil pumping stress in the bar method for early warning establishes grading forewarning system mechanism, real
Now to the monitoring and early warning of oil pumping stress in the bar.This method establishes Early-warning Model by four change systems, first from source database reality
When extract sucker rod maximum load, minimum load, using formula calculate sucker rod real-time reduced stress.Then early warning mould is used
The decision logics such as the threshold value, the trend that set in type judge reduced stress, carry out early warning after noting abnormalities.Administrative staff's root
Corresponding improvement countermeasure is taken according to warning level, so that sucker rod stress state restores normal.
Detailed description of the invention
Fig. 1 is the flow chart of a specific embodiment of rod-pumped well roofbolt stress method for early warning of the invention；
Fig. 2 is the schematic diagram of Early-warning Model set interface in a specific embodiment of the invention；
Fig. 3 is the schematic diagram of the Early-warning Model after being arranged in a specific embodiment of the invention.
Specific embodiment
To enable above and other objects, features and advantages of the invention to be clearer and more comprehensible, preferably implementation is cited below particularly out
Example, and cooperate shown in attached drawing, it is described in detail below.
As shown in FIG. 1, FIG. 1 is the flow charts of rod-pumped well roofbolt stress method for early warning of the invention.
Step 101: four change system acquisition oil well associated production parameter, and are transmitted to multi-parameter Early-warning Model.One
In embodiment, the oil well associated production parameter of acquisition includes sucker rod maximum load, minimum load, sucker rod cross-sectional area.
Step 102: multi-parameter Early-warning Model calculates maximum reduced stress according to associated production parameter.Specific formula for calculation is such as
Under:
[σ-1]≥σc
In formula, [σ-1] ----allowable stress；σc----reduced stress；σaThe stress amplitude of ----pulsating stress；
fr--- --- sucker rod cross-sectional area；Pmax----maximum polished rod load；Pmin----minimum polished rod load；
Finally derive maximum reduced stress formula:
Step 103: multi-parameter early warning software sentences maximum reduced stress according to the roofbolt stress Early-warning Model of setting
Break and alarms.Early-warning Model is provided that
(1) early-warning parameters are arranged
Early warning title: overstressing early warning
Judging index: maximum reduced stress
Determined type: threshold value/trend
Decision logic: threshold value (super allowable stress 90%, super allowable stress 80%, super allowable stress 70%), trend (continue
Rising, ascendant trend etc.).
(2) determination method and standard
1. calculating maximum reduced stress: changing big data platform using four, extract real-time sucker rod maximum load, minimum carry
Lotus calculates maximum reduced stress in real time using maximum reduced stress formula.
2. setting decision logic:
First is that setting allowable stress limiting threshold value.In one embodiment, for all using H grade pumping rod (nickel-molybdenum steel),
The maximum permissible stress 100MPa of new bar.What it is in view of live practical application is mostly to repair bar, in given threshold according to oil pumping
Bar frequency of usage will repair bar and be divided into one to level Four.In combination with each well burn into eccentric wear, pit shaft situations such as, setting is respective
Allowable stress limiting threshold value, realize " one value of a well ", specifically see the table below:
The selection of 1 allowable stress limiting threshold value of table
Sucker rod is breaking risk lower than limiting value there are still bar, therefore three-level early warning mechanism is arranged, and is connect according to reduced stress
The degree of near limit threshold value carries out different grades of early warning.Oil recovery administrative staff take corresponding control measures according to warning level
(such as adjusting ginseng, hot-washing wax remover) reduces oil pumping stress in the bar in time, and prevention bar is disconnected to be occurred.
2 stress warning level of table
Second is that the maximum reduced stress of setting persistently rises, ascendant trend early warning, design parameter is depending on specific oil well conditions.
Such as: setting 6 hour period in, reduced stress persistently rise then early warning or within 48 hours reduced stress fluctuation rise it is then pre-
It is alert.
Step 104: administrative staff are disposed rod-pumped well after receiving warning message, it is made to return to normal production.
In one embodiment, Fig. 2 is the interface for carrying out Early-warning Model setting, at this interface, inputs the ginseng such as pound sign, threshold value
Number, to establish the Early-warning Model of a well.Fig. 3 is the Early-warning Model for establishing certain mouthful of well completed.
Claims (10)
1. rod-pumped well roofbolt stress method for early warning, which is characterized in that the rod-pumped well roofbolt stress method for early warning includes:
Step 1, oil well associated production parameter is acquired；
Step 2, maximum reduced stress is calculated according to oil well associated production parameter；
Step 3, maximum reduced stress is judged and is alarmed according to the roofbolt stress early-warning parameters that Early-warning Model is arranged；
Step 4, administrative staff are disposed rod-pumped well after receiving warning message, it is made to return to normal production.
2. rod-pumped well roofbolt stress method for early warning according to claim 1, which is characterized in that in step 1, acquisition
Oil well associated production parameter includes sucker rod maximum load, minimum load, sucker rod cross-sectional area.
3. rod-pumped well roofbolt stress method for early warning according to claim 1, which is characterized in that in step 2, maximum folding
Calculate Stress calculation formula are as follows:
In formula, fr--- --- sucker rod cross-sectional area；Pmax----maximum polished rod load；Pmin----minimum polished rod load.
4. rod-pumped well roofbolt stress method for early warning according to claim 1, which is characterized in that in step 3, roofbolt is answered
Power early-warning parameters include allowable stress limiting threshold value and maximum reduced stress value.
5. rod-pumped well roofbolt stress method for early warning according to claim 4, which is characterized in that in step 3, according to pumping
Beam hanger frequency of usage will repair bar and be divided into one to level Four, and burn into eccentric wear, pit shaft situation in combination with each well set new bar
With the different allowable stress limiting threshold values for repairing bar.
6. rod-pumped well roofbolt stress method for early warning according to claim 5, which is characterized in that in step 3, new bar
Limiting threshold value is 100MPa, and the limiting threshold value that level-one repairs bar is 95MPa, and the limiting threshold value that second level repairs bar is 90MPa, three-level
The limiting threshold value for repairing bar is 85MPa, and the limiting threshold value that level Four repairs bar is 80MPa, there is the well of burn into eccentric wear situation, the limit
Threshold value multiplied by 0.8-1.0 coefficient.
7. rod-pumped well roofbolt stress method for early warning according to claim 4, which is characterized in that in step 3, sucker rod
Break risk in the case where being lower than limiting threshold value there are still bar, therefore three-level early warning mechanism is set, according to reduced stress close to pole
The degree for limiting threshold value carries out different grades of early warning.
8. rod-pumped well roofbolt stress method for early warning according to claim 7, which is characterized in that in step 3, level-one is pre-
Police is > limiting threshold value 70%, coping mechanism is encryption observation；Second level early warning is > limiting threshold value 80%, coping mechanism be into
Row pretreatment, including adjustment manufacturing parameter, hot-washing wax remover load down；Three-level early warning is > limiting threshold value 90%, coping mechanism is
Hard stop, analysis and improvement.
9. rod-pumped well roofbolt stress method for early warning according to claim 4, which is characterized in that in step 3, setting is most
Big reduced stress persistently rises, ascendant trend early warning.
10. rod-pumped well roofbolt stress method for early warning according to claim 9, which is characterized in that in step 3, setting 6
In period hour, reduced stress persistently rises then early warning or within 48 hours reduced stress fluctuation rising then early warning.
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| CN201710870117.9A CN109538190B (en) | 2017-09-22 | 2017-09-22 | Stress early warning method for rod string of pumping well |
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|---|---|---|---|
| CN201710870117.9A CN109538190B (en) | 2017-09-22 | 2017-09-22 | Stress early warning method for rod string of pumping well |
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| CN109538190B CN109538190B (en) | 2022-04-01 |
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Citations (8)
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| US20110011581A1 (en) * | 2009-07-14 | 2011-01-20 | Halliburton Energy Services, Inc. | System and Method for Servicing a Wellbore |
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| EP2963234A1 (en) * | 2014-07-01 | 2016-01-06 | Weatherford/Lamb, Inc. | Stress calculations for sucker rod pumping systems |
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2017
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| US4483188A (en) * | 1983-04-18 | 1984-11-20 | Fmc Corporation | Method and apparatus for recording and playback of dynagraphs for sucker-rod wells |
| US20070020110A1 (en) * | 2005-06-29 | 2007-01-25 | Weatherford/Lamb, Inc. | Method for estimating pump efficiency |
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| CN103678927A (en) * | 2013-12-20 | 2014-03-26 | 中国石油天然气集团公司 | Thermal production well casing tubular column total strain calculating method |
| EP2963234A1 (en) * | 2014-07-01 | 2016-01-06 | Weatherford/Lamb, Inc. | Stress calculations for sucker rod pumping systems |
| CN104749021A (en) * | 2015-03-03 | 2015-07-01 | 中国石油天然气股份有限公司 | Intensity calibration method for ultra-high-strength sucker rod string |
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