CN116291395A - Method for distinguishing overflow, lost circulation abnormality and abnormal types of oil and gas well drilling - Google Patents
Method for distinguishing overflow, lost circulation abnormality and abnormal types of oil and gas well drilling Download PDFInfo
- Publication number
- CN116291395A CN116291395A CN202111562725.6A CN202111562725A CN116291395A CN 116291395 A CN116291395 A CN 116291395A CN 202111562725 A CN202111562725 A CN 202111562725A CN 116291395 A CN116291395 A CN 116291395A
- Authority
- CN
- China
- Prior art keywords
- pump
- overflow
- outlet flow
- drilling
- lost circulation
- 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
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000005856 abnormality Effects 0.000 title claims abstract description 38
- 230000002159 abnormal effect Effects 0.000 title claims abstract description 32
- 239000002002 slurry Substances 0.000 claims abstract description 29
- 238000011010 flushing procedure Methods 0.000 claims abstract description 20
- 238000010606 normalization Methods 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 claims description 39
- 150000002430 hydrocarbons Chemical class 0.000 claims description 14
- 229930195733 hydrocarbon Natural products 0.000 claims description 13
- 239000004215 Carbon black (E152) Substances 0.000 claims description 10
- 230000009545 invasion Effects 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000012850 discrimination method Methods 0.000 claims 3
- 239000007789 gas Substances 0.000 abstract description 17
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 239000003345 natural gas Substances 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000013527 convolutional neural network Methods 0.000 description 2
- 230000005574 cross-species transmission Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000005236 sound signal Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013135 deep learning Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000033772 system development Effects 0.000 description 1
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
- E21B47/10—Locating fluid leaks, intrusions or movements
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Mechanical Engineering (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention relates to the field of well control safety in petroleum and natural gas drilling engineering, in particular to a method for distinguishing overflow, lost circulation abnormality and abnormal types of oil and gas well drilling. According to the drilling state, the method utilizes three parameters of the pressure of the vertical pipe, the flow rate of the outlet and the volume of the mud pit to judge overflow and/or abnormal lost circulation: in the pump-off state, if the outlet flow is not zero or the volume of the mud pit is increased, judging that overflow is abnormal; under the state of starting the pump, normalizing the pump flushing, and calculating the pressure of the vertical pipe and the outlet flow after the pump flushing is normalized; and (3) according to the pressure change condition of the normalized vertical pipe, carrying out overflow and/or lost circulation abnormality judgment by utilizing the change of the outlet flow and the slurry pool volume after pump flushing normalization. The invention adopts a plurality of logging parameters to directly judge the abnormality, has high judging accuracy and simple method.
Description
Technical Field
The invention relates to the field of well control safety in petroleum and natural gas drilling engineering, in particular to a method for distinguishing overflow, lost circulation abnormality and abnormal types of oil and gas well drilling.
Background
Overflow and lost circulation are two kinds of easy-to-occur well drilling anomalies in the well drilling process, and the occurrence of the anomalies can increase development cost, reduce development efficiency, destroy a reservoir, and once the control is not enough, well drilling accidents such as well collapse, blowout and the like can be induced, so that serious casualties and economic losses are caused. Drilling abnormality monitoring and early warning method research and system development are always research hot spots in the field of well control safety.
Advanced drilling abnormality monitoring systems abroad comprehensively study and judge the occurrence of abnormality by using ground and underground monitoring data. Because the underground measurement parameters can reflect underground complex conditions more directly, the accuracy and reliability of monitoring drilling anomalies by using the underground measurement parameters are higher. However, the current data transmission rate while drilling is too low, and the application of measurement while drilling tools is not yet popular in China, and the applicability of the method in the domestic drilling site is not strong. In addition, most of the existing drilling abnormality early warning methods do not consider the influence of drilling site conditions and well-to-well differences and the constraint relation among parameters, and are difficult to comprehensively and accurately describe drilling abnormalities, so that the drilling abnormality identification accuracy is low and the false alarm rate is high.
Chinese patent No. 112483076a discloses a system for identifying drilling construction complications, comprising: the information acquisition module is arranged at the ground drilling sleeve and is used for acquiring an audio signal of the rock breaking position of the underground drill bit; the signal analysis module is connected with the information acquisition module through a signal transmission cable and is used for receiving an audio signal and carrying out acoustic characteristic analysis on the signal; the environment recognition module is used for determining whether abnormal drilling conditions occur underground according to the current acoustic characteristic analysis result and the normal acoustic characteristics, determining the type of the abnormal conditions when the abnormal conditions occur, obtaining a corresponding diagnosis result and recording the acoustic characteristics under the normal drilling environment; and the result output module is used for outputting and responding to the diagnosis result. The invention can find and judge the underground complex condition and the corresponding type in the drilling process timely and accurately with lower cost. The abnormal condition type is one or more selected from stuck drill, well kick, well wall collapse, drilling tool penetration and gas invasion.
Chinese patent application CN112926839a provides a coordinated monitoring method of risk of spillover for drilling of oil and gas wells, the scheme comprising: acquiring uphole and downhole overflow monitoring parameters, and preprocessing data; respectively constructing an expert system risk identification model and a risk intelligent identification model; based on the preprocessed data, adopting a collaborative discrimination mode of combining the expert system risk identification model and the risk intelligent identification model to realize overflow risk monitoring in the oil and gas well drilling process; according to the scheme, by combining an expert system and a deep learning technology, advantages of the two risk monitoring methods are complementary, and the overflow risk can be rapidly, accurately and intelligently judged.
Chinese patent application CN110443488A provides a method for identifying risk of drilling spillover based on convolutional neural network, the method comprising obtaining real-time working condition data collected by a comprehensive logging tool; expanding a data set by adopting a sliding overlapping sampling mode for each real-time working condition data acquired by the comprehensive logging instrument; carrying out normalization pretreatment on the real-time working condition data; and inputting the normalized and preprocessed real-time working condition data into a trained convolutional neural network model, and outputting a drilling overflow risk identification result.
Most of the well drilling abnormality recognition methods mainly comprise abnormality recognition, do not further analyze and judge the abnormality type, and cannot pertinently guide measures to be taken on a well drilling site. The well drilling site is generally provided with a comprehensive well logging instrument or a small well logging instrument, the acquisition of well logging parameters is popular, and the well drilling anomaly monitoring method based on the well logging parameters has stronger site applicability and popularization and application values.
Disclosure of Invention
The invention mainly aims to provide a method for distinguishing the overflow, lost circulation abnormality and abnormal types of oil and gas well drilling. The invention adopts a plurality of logging parameters to directly judge the abnormality, has high judging accuracy and simple method.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a method for judging overflow and lost circulation abnormality of an oil and gas well, which judges overflow and/or lost circulation abnormality by utilizing three parameters of pressure of a vertical pipe, flow rate of an outlet and volume of a mud pit according to a drilling state: in the pump-off state, if the outlet flow is not zero or the volume of the mud pit is increased, judging that overflow is abnormal; and normalizing the pressure of the vertical pipe in the pump-on state, and judging overflow and/or abnormal lost circulation by utilizing the change of the outlet flow and the volume of the slurry pool according to the change condition of the pressure of the vertical pipe after normalization.
Further, the calculation formula of the riser pressure after pump flushing normalization is shown in formula (1):
in the formula, SPP new The SPP is the pressure of the vertical pipe obtained by the comprehensive logging instrument during sampling, and the units are MPa; PUMP new The PUMP is used for pumping at the sampling moment, and the PUMP is used for pumping immediately before sampling, and the units are all the PUMP/min.
Further, under the condition that the normalized pressure of the vertical pipe is unchanged or falls, if the outlet flow and the volume of the slurry pool rise at the same time; or the outlet flow rate rises, and the volume of the slurry pool is unchanged; or the outlet flow is unchanged, and the volume of the slurry pool is increased; judging that the overflow is abnormal;
under the condition that the normalized pressure of the vertical pipe is unchanged, the outlet flow and the volume of the slurry pool are simultaneously reduced; or the outlet flow is reduced, and the volume of the slurry pool is unchanged; or the outlet flow is unchanged, and the volume of the slurry pool is reduced; and judging that the well leakage is abnormal.
Further, when the normalized riser pressure increases, if the outlet flow rate increases or the slurry pool volume increases, it is determined that the overflow is abnormal.
Further, the outlet flow calculation formula is shown in formula (2):
in FLOWOUT new The unit is L/s for the outlet flow at the sampling moment; PUMP new The unit is the pump flushing at the sampling moment, the unit is flushing/min, q is the displacement of each flushing, and the unit is L/flushing; k is regression fit coefficient, dimensionless.
Further, the determination of the drilling state comprises the following steps:
judging the pump-on state by using the pump flushing, wherein the pump flushing is more than 0 and is in the pump-on state; pump stroke = 0, off pump state;
drilling/non-drilling status discrimination:
in the pump-on state, when the drilling pressure is not available or is low and the well depth is unchanged, the drilling state is a non-drilling state;
in the pump-on state, the drilling state is realized when the weight on bit is higher, the height of the big hook is continuously reduced or stabilized, the load of the big hook is basically stabilized, and the depth of the drill bit is continuously increased and is greater than or equal to the well depth.
A method for distinguishing the types of overflow and leakage abnormality of an oil and gas well comprises the following steps:
after the overflow and/or the lost circulation abnormality are judged by adopting the oil and gas well drilling overflow and lost circulation abnormality judging method, judging the overflow and lost circulation abnormality type by using the total hydrocarbon and the outlet density; the method comprises the steps of,
for the drilling conditions, the change in dc index is used to determine the flooding and/or lost circulation position.
The overflow abnormal type comprises an oil gas invasion type and a water invasion type; types of lost circulation anomalies include severe, moderate, and general losses.
Further, after determining that overflow abnormality occurs, judging that the oil gas invades if the increase of the total hydrocarbon is monitored; if the total hydrocarbon is not increased and the outlet density is changed, judging that the water is immersed; if the dc index is significantly reduced in the drilling state, the well depth corresponding to the reduced position is determined as the position where the overflow is located.
Further, after the occurrence of abnormal lost circulation is judged, if the outlet flow and the pressure of the vertical pipe are both zero, judging that the lost circulation is serious; if the outlet flow is zero and the riser pressure is not zero, judging that the leakage is medium; if the outlet flow and the pressure of the vertical pipe are not zero, judging that the leakage is common.
The method selects 12 logging parameters including PUMP flushing (PUMP), riser pressure (SPP), outlet Flow (FLOWOUT) and mud PIT volume (PIT), weight On Bit (WOB), hook height (HKH), hook load (WOH), bit position (BITDEPTH), well DEPTH (DEPTH), outlet density (MWOUT), dc index (dc) and total hydrocarbon (TG); the pump flushing is used for judging the working state of the slurry pump, and the pressure of the vertical pipe, the outlet flow and the volume of the slurry pool are used for judging overflow and lost circulation abnormality; the weight on bit, hook load, hook height, bit position and well depth are used to determine drilling conditions, and the outlet density, dc index and total hydrocarbons are used to determine overflow and lost circulation anomaly types.
Compared with the prior art, the invention has the following advantages:
the method considers the influence of on-site drilling conditions and well-to-well differences and the constraint relation among parameters, and has higher accuracy rate and low false alarm rate for identifying overflow and lost circulation risks; on the basis of identifying overflow and lost circulation anomalies, the types of overflow and lost circulation can be further analyzed, and the method is favorable for field personnel to take targeted countermeasures.
The method can rapidly judge the risk according to each logging parameter, has simple steps and is beneficial to popularization and application.
Drawings
FIG. 1 is a flow chart of a method for determining an overflow and lost circulation anomaly of an oil and gas well according to embodiment 1 of the present invention;
FIG. 2 is a flow chart of a method for determining the type of well logging overflow and lost circulation anomalies according to embodiment 2 of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular forms also are intended to include the plural forms unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, and/or combinations thereof.
In order to enable those skilled in the art to more clearly understand the technical scheme of the present invention, the technical scheme of the present invention will be described in detail with reference to specific embodiments.
Example 1
As shown in fig. 1, the method for distinguishing the overflow and abnormal leakage of the oil and gas well drilling comprises the following steps:
drilling state identification:
(1) Pump status identification:
discriminating by using a PUMP Up (PUMP) parameter:
if the pump=0, judging that the slurry PUMP is in a PUMP-off state; if the PUMP is more than 0, judging that the slurry PUMP is in an on-state.
(2) Drilling/non-drilling state discriminating method
And in the pump-on state, judging whether the drilling condition is the drilling condition according to the change conditions of the weight of the drill, the height of the big hook and the load of the big hook and the relation between the position of the drill and the well depth.
When there is no weight on bit or the weight on bit is low and the well depth is unchanged, i.e. when:
WOB≤0&λ lower ≤DEPTH now -DEPTH≤λ upper
or: WOB < WOB norm &λ lower ≤DEPTH now -DEPTH≤λ upper
And judging that the drilling state is not drilling state.
When the weight on bit is high, the hook height is continuously reduced or stabilized, the hook load is basically stabilized, the bit depth is continuously increased and is greater than or equal to the well depth, namely, when the following conditions are simultaneously satisfied:
WOB＞WOB norm
δ＜HKH now -HKH＜0 P HKH L ≤HKH now ≤HKH H
WOH L ≤WOH now ≤WOH H
δ＞BITDEPTH now -BITDEPTH＞0&δ≥BITDEPTH now -DEPTH≥0
and judging the drilling working condition.
Wherein lambda is lower To allow for a lower bound of ripple lambda upper To allow the upper limit of fluctuation, setting can be performed according to the field situation; delta is an error threshold variable, and the value can be set according to actual situations in consideration of data fluctuation. WOB (WOB) now For the weight on bit at the time of sampling, WOB is the weight on bit at the time of sampling before the time of sampling, WOB norm To normal weight on bit, HKH now The height of the hook is the height of the hook at the moment of sampling and the HKH is the height of the hook at the moment of sampling before the sampling L And HKH H The minimum hook height and the maximum hook height, WOH, of the stable range respectively now WOH for sampling hook load L And WOH (WOH) H The lowest maximum hook load and the highest maximum hook load of the stable range, respectively. BITDEPTH now BITDEPTH is the bit DEPTH at the moment before sampling, and DEPTH is the well DEPTH.
(II) overflow and lost circulation anomaly identification
(1) Overflow and lost circulation abnormality determination in pump-off state
In the pump-off state, the pressure of the vertical pipe is zero, so that only two parameters of the outlet flow and the mud pit volume are used for distinguishing. If the outlet flow is not zero or the mud pit volume increases, i.e. when:
FLOWOUT now ≠0
or: delta > PIT now -PIT＞0
In this case, it is determined that the overflow is abnormal.
Wherein FLOWOUT now The outlet flow is the outlet flow when sampling is performed in the pump-off state; PIT (PIT) now The volume of the slurry pool is the volume of the slurry pool when sampling is carried out under the state of closing the pump; PIT is the volume of the mud PIT at the previous moment when sampling is performed in a pump-off state; delta is an error threshold variable, and the value can be set according to actual situations in consideration of data fluctuation.
(2) Overflow and lost circulation abnormality determination in pump-on state
In the pump-on state, in order to more accurately judge the overflow and lost circulation abnormality occurrence level, it is necessary to further distinguish the drilling/non-drilling state, but the judging method in the drilling/non-drilling state is the same, and the specific method is as follows:
firstly, normalizing the pressure of the vertical pipe by utilizing the ratio of the pumping speed at the sampling moment to the pumping speed at the moment before sampling, and eliminating the influence of the pumping speed change on the pressure change of the vertical pipe; the normalization formula is shown as formula (1):
in the formula, SPP new The SPP is the pressure of the vertical pipe obtained by the comprehensive logging instrument during sampling, and the units are MPa; PUMP new The PUMP is a PUMP at the sampling moment, and the PUMP is a PUMP at the moment before sampling, and the units are the PUMP/min.
And then, obtaining the linear relation between the pump discharge capacity and the outlet flow by using a regression fitting method, and converting the relation between the pump discharge capacity and the outlet flow according to the relation between the pump discharge capacity and the pump discharge capacity, thereby eliminating the influence of the pump discharge capacity change on the outlet flow and improving the accuracy of overflow and lost circulation anomaly identification. The relation between the pump displacement and the outlet flow after regression fitting is shown as a formula (3), the calculation formula of the pump displacement is shown as a formula (4),
Q＝k×FLOWOUT (3)
wherein Q is pump displacement, and the unit is L/s; k is a regression fit coefficient, dimensionless; FLOWOUT is the outlet flow in L/s; q is per volume per stroke, unit L/stroke.
The relationship between the outlet flow at the sampling time and the pump flushing at the sampling time can be obtained as shown in the formula (2):
in FLOWOUT new The unit is L/s for the outlet flow at the sampling moment; PUMP new Is the pump flushing at the sampling moment.
And finally, according to the change condition of the normalized vertical pipe pressure, carrying out abnormal judgment by utilizing the change of the outlet flow and the volume of the mud pit.
Under the condition that the normalized pressure of the vertical pipe is unchanged, if the outlet flow and the slurry pool volume rise simultaneously or one of the outlet flow and the slurry pool volume is in an ascending trend, the other parameter is unchanged, namely, when the condition that:
δ＞FLOWOUT new -FLOWOUT＞0&δ＞PIT new -PIT＞0
or: delta > FLOWOUT new -FLOWOUT＞0&λ lower ≤PIT new -PIT＜λ upper
Or: lambda (lambda) lower ≤FLOWOUT new -FLOWOUT≤λ upper &δ＞PIT new Judging that overflow is abnormal when PIT is more than 0;
if the outlet flow and the volume of the slurry tank drop simultaneously or one of the outlet flow and the volume of the slurry tank shows a decreasing trend, the other is unchanged, namely when the conditions are satisfied:
δ＜FLOWOUT new -FLOWOUT＜0&δ＜PIT new -PIT＜0
or: delta < FLOWOUT new -FLOWOUT＜0&λ lower ≤PIT new -PIT≤λ upper
Or: lambda (lambda) lower ≤FLOWOUT new -FLOWOUT≤λ upper &δ＜PIT new And judging that the well leakage is abnormal when PIT is less than 0.
Under the condition that the pressure of the normalized vertical pipe is reduced, if the outlet flow and the volume of the slurry pool are increased at the same time or one of the outlet flow and the volume of the slurry pool is in an upward trend, the other parameter is unchanged, namely, when the condition that:
δ＞FLOWOUT new -FLOWOUT＞0&δ＞PIT new -PIT＞0
or: delta > FLOWOUT new -FLOWOUT＞0&λ lower ≤PIT new -PIT＜λ upper
Or: lambda (lambda) lower ≤FLOWOUT new -FLOWOUT≤λ upper &δ＞PIT new Judging that overflow is abnormal when PIT is more than 0;
if the outlet flow and the volume of the slurry tank drop simultaneously or one of the outlet flow and the volume of the slurry tank shows a decreasing trend, the other is unchanged, namely when the conditions are satisfied:
δ＜FLOWOUT new -FLOWOUT＜0&δ＜PIT new -PIT＜0
or: delta < FLOWOUT new -FLOWOUT＜0&λ lower ≤PIT new -PIT≤λ upper
Or: lambda (lambda) lower ≤FLOWOUT new -FLOWOUT≤λ upper &δ＜PIT new Judging that the well leakage is abnormal when PIT is less than 0;
if the volume of the mud pit is unchanged or the outlet flow is unchanged, namely when the following conditions are satisfied:
λ lower ≤FLOWOUT new -FLOWOUT≤λ upper
or: lambda (lambda) lower ≤PIT new -PIT≤λ upper
In this case, it is determined that the other abnormality is present.
In the case of a normalized riser pressure rise, if the outlet flow rate rises or the mud pit volume rises, i.e. when:
δ＞FLOWOUT new -FLOWOUT＞0
or: delta > PIT new -PIT＞0
When the overflow is abnormal; if the outlet flow is unchanged or the volume of the mud pit is unchanged, namely when the following conditions are satisfied:
λ lower ≤FLOWOUT new -FLOWOUT≤λ upper
or: lambda (lambda) lower ≤PIT new -PIT≤λ upper
In this case, it is determined that the other abnormality is present.
Wherein FLOWOUT new The outlet flow obtained at the sampling moment; FLOWOUT is the outlet flow at the moment before sampling; PIT (PIT) new The volume of the mud pit is the volume of the mud pit during sampling; PIT is the volume of the mud PIT at the moment before sampling; lambda (lambda) lower To allow for a lower bound of ripple lambda upper To allow the upper limit of fluctuation, setting can be performed according to the field situation; delta is an error threshold variable, and the value can be set according to actual situations in consideration of data fluctuation.
Example 2
As shown in fig. 2, a method for distinguishing the type of well overflow and lost circulation abnormality of an oil and gas well comprises the following steps:
after the overflow and/or lost circulation abnormality of the oil and gas well are judged by adopting the method in the embodiment 1, the overflow and lost circulation abnormality type is judged by utilizing the total hydrocarbon and the outlet density; the method comprises the steps of,
for the drilling conditions, the change in dc index is used to determine the flooding and/or lost circulation position.
(1) Overflow anomaly type discrimination
After determining that an overflow anomaly has occurred, if an increase in total hydrocarbons is detected, when:
δ＞TG now when TG is more than 0, judging that the oil gas is invaded; if the total hydrocarbon is not increased but the outlet density is changed, the water invasion is judged.
For the drilling conditions, the determination of the flooding position is made using a change in the dc index. If the dc index becomes significantly smaller, i.e. when:
δ＜dc now and when dc < 0, determining the well depth corresponding to the reduced position as the position of the overflow. Otherwise the first set of parameters is selected,the overflow position is not judged.
Wherein TG now TG is the total hydrocarbon at the time immediately before sampling in order to perform sampling. Delta is an error threshold variable, and the value can be set according to actual situations in consideration of data fluctuation.
(2) Discrimination of lost circulation anomaly type
Judging that the lost circulation is seriously lost if the outlet flow and the pressure of the vertical pipe are zero after judging that the lost circulation is abnormal;
if the outlet flow is zero and the riser pressure is not zero, judging that the leakage is medium;
and if the outlet flow and the pressure of the vertical pipe are not zero, judging that the leakage is common.
For the drilling conditions, the change in dc index is used to make the leak location determination. If the dc index becomes significantly smaller, i.e. when: delta < dc now And when dc < 0, determining the well depth corresponding to the reduced position as the position of the lost circulation. Otherwise, the lost circulation position is not judged.
Wherein dc now Dc at the time of sampling; dc is dc at the previous moment of sampling; lambda (lambda) lower To allow for a lower bound of ripple lambda upper To allow the upper limit of fluctuation, setting can be performed according to the field situation; delta is an error threshold variable, and the value can be set according to actual situations in consideration of data fluctuation.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (9)
1. The method for distinguishing the overflow and lost circulation abnormality of the oil and gas well is characterized in that the overflow and/or lost circulation abnormality is distinguished by utilizing three parameters of the pressure of a vertical pipe, the flow of an outlet and the volume of a mud pit according to the drilling state:
in the pump-off state, if the outlet flow is not zero or the volume of the mud pit is increased, judging that overflow is abnormal;
and normalizing the pressure of the vertical pipe in the pump-on state, and judging overflow and/or abnormal lost circulation by utilizing the change of the outlet flow and the volume of the slurry pool according to the change condition of the pressure of the vertical pipe after normalization.
2. The discrimination method according to claim 1, wherein the riser pressure normalization calculation formula is shown in formula (1):
in the formula, SPP new The SPP is the pressure of the vertical pipe obtained by the comprehensive logging instrument during sampling, and the units are MPa; PUMP new The PUMP is used for pumping at the sampling moment, and the PUMP is used for pumping immediately before sampling, and the units are all the PUMP/min.
3. The method according to claim 1, wherein if the outlet flow rate and the mud pit volume rise simultaneously, the normalized riser pressure is unchanged or falls; or alternatively, the first and second heat exchangers may be,
the outlet flow rises, and the volume of the slurry pool is unchanged; or alternatively, the first and second heat exchangers may be,
the outlet flow is unchanged, and the volume of the slurry pool rises; judging that the overflow is abnormal;
under the condition that the normalized pressure of the vertical pipe is unchanged, the outlet flow and the volume of the mud pit are simultaneously reduced; or alternatively, the first and second heat exchangers may be,
the outlet flow is reduced, and the volume of the slurry pool is unchanged; or alternatively, the first and second heat exchangers may be,
the outlet flow is unchanged, and the volume of the slurry pool is reduced; and judging that the well leakage is abnormal.
4. The method according to claim 1, wherein the overflow abnormality is determined when the outlet flow rate or the slurry pool volume increases in the case where the normalized riser pressure increases.
5. The discrimination method according to any one of claims 1 to 4, wherein the outlet flow calculation formula is shown in formula (2):
in FLOWOUT new The unit is L/s for the outlet flow at the sampling moment; PUMP new The unit is the pump flushing at the sampling moment, the unit is flushing/min, q is the displacement of each flushing, and the unit is L/flushing; k is regression fit coefficient, dimensionless.
6. The discrimination method of claim 1, wherein the discrimination of the drilling condition includes the steps of:
judging the pump-on state by using the pump flushing, wherein the pump flushing is more than 0 and is in the pump-on state; pump stroke = 0, off pump state;
drilling/non-drilling status discrimination:
in the pump-on state, when the drilling pressure is not available or is low and the well depth is unchanged, the drilling state is a non-drilling state;
in the pump-on state, the drilling state is realized when the weight on bit is higher, the height of the big hook is continuously reduced or stabilized, the load of the big hook is basically stabilized, and the depth of the drill bit is continuously increased and is greater than or equal to the well depth.
7. A method for distinguishing the types of overflow and lost circulation anomaly of an oil and gas well, which is characterized in that after the overflow and/or lost circulation anomaly are distinguished by adopting the method as claimed in any one of claims 1-6, the types of overflow and lost circulation anomaly are distinguished by using the density of the whole hydrocarbon and the outlet; the method comprises the steps of,
for the drilling conditions, the change in dc index is used to determine the flooding and/or lost circulation position.
The overflow abnormal type comprises an oil gas invasion type and a water invasion type; types of lost circulation anomalies include severe, moderate, and general losses.
8. The method according to claim 7, wherein after determining that the overflow abnormality occurs, if an increase in total hydrocarbons is monitored, it is determined as hydrocarbon invasion; if the total hydrocarbon is not increased and the outlet density is changed, judging that the water is immersed;
if the dc index is significantly reduced in the drilling state, the well depth corresponding to the reduced position is determined as the position where the overflow is located.
9. The method according to claim 7, wherein after determining that the lost circulation abnormality occurs, if the outlet flow rate and the riser pressure are both zero, the serious loss is determined;
if the outlet flow is zero and the riser pressure is not zero, judging that the leakage is medium;
if the outlet flow and the pressure of the vertical pipe are not zero, judging that the leakage is common.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111562725.6A CN116291395A (en) | 2021-12-20 | 2021-12-20 | Method for distinguishing overflow, lost circulation abnormality and abnormal types of oil and gas well drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111562725.6A CN116291395A (en) | 2021-12-20 | 2021-12-20 | Method for distinguishing overflow, lost circulation abnormality and abnormal types of oil and gas well drilling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116291395A true CN116291395A (en) | 2023-06-23 |
Family
ID=86817282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111562725.6A Pending CN116291395A (en) | 2021-12-20 | 2021-12-20 | Method for distinguishing overflow, lost circulation abnormality and abnormal types of oil and gas well drilling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116291395A (en) |
-
2021
- 2021-12-20 CN CN202111562725.6A patent/CN116291395A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103291284B (en) | Based on the pit shaft gas cut early monitoring method measured with brill annular pressure and device | |
| US10430897B2 (en) | Automated rig activity report generation | |
| CN113323653B (en) | Early warning method and device for overflow of deep water drilling | |
| US9115567B2 (en) | Method and apparatus for determining efficiency of a sampling tool | |
| CN103615236A (en) | Method for monitoring formation pressure in real time through remote logging information | |
| CN105089620A (en) | Drilling tool jamming monitoring system, drilling tool jamming monitoring method and drilling tool jamming monitoring device | |
| RU2688652C2 (en) | Methods of operation of downhole equipment based on conditions in wellbore | |
| US20130087388A1 (en) | Wellbore influx detection with drill string distributed measurements | |
| CN111734399A (en) | Intelligent leakage blocking method and system in drilling process | |
| CN112926839A (en) | Overflow risk cooperative monitoring method and system for oil and gas well drilling process | |
| CN104632186B (en) | Secondary kill-job parameter detecting processing method and processing device after kill-job failure | |
| CN116291395A (en) | Method for distinguishing overflow, lost circulation abnormality and abnormal types of oil and gas well drilling | |
| NO20170710A1 (en) | Borehole casing deployment detection | |
| AU2016244320A1 (en) | Sample capture prioritization | |
| CN110222352B (en) | Annulus pressure monitoring method for preventing sand setting stuck drill | |
| CN111625916A (en) | Method and system for calculating stability value of well wall | |
| CN116307670A (en) | Oil-gas well overflow risk monitoring method and system based on two-way long-short-term memory network | |
| CN203335058U (en) | Coalbed-methane under-balanced horizontal well borehole cleaning monitoring device | |
| CN112360439A (en) | Drilling underground gas invasion monitoring and intelligent well control system and implementation method | |
| CN104863571A (en) | Pressure monitoring device based on coalbed gas double-barrel and double-circulation | |
| CN116701952B (en) | Knowledge-graph-based underground complex working condition identification method | |
| CN103291276A (en) | Pressure monitoring system based on coal-bed methane inflation underbalance | |
| JP7489043B2 (en) | Detention prediction method and system | |
| Dalton et al. | The benefits of real-time downhole pressure and tension data with wired composite tubing | |
| CN115961938A (en) | Monitoring method and system for target well |
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 |