CN104008507A - Evaluation method for production time rate of oil well - Google Patents
Evaluation method for production time rate of oil well Download PDFInfo
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- CN104008507A CN104008507A CN201410204147.2A CN201410204147A CN104008507A CN 104008507 A CN104008507 A CN 104008507A CN 201410204147 A CN201410204147 A CN 201410204147A CN 104008507 A CN104008507 A CN 104008507A
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Abstract
The invention relates to an evaluation method for a production time rate of an oil well. The evaluation method comprises the following steps that 1), all production events of an oil field are divided into operation events and non-operation events, the operation events are the events within the scope of the duty of managers, and namely, the managers should be responsible for occurrence of the events; the non-operation events are events, causing loss of the yield, beyond the control scope of the managers; the operation events are further divided into the planned events and the unplanned events, the planned events are the events which are planned and implemented by the operators with the definite purpose, and the unplanned events are mainly the emergent events occurring in the oil field; 2), the calibration yield of the oil well is determined; 3), the comprehensive operation efficiency of the oil field is calculated and defined as the ratio of the actual yield of the oil well to the calibration yield of the oil well. According to the method, the comprehensive operation efficiency with the yield as the core is adopted for replacing the traditional well switching time rate with the time as the core, the method is more scientific and reasonable on the theory basis, the actual production level of the oil field can be directly reflected, and influence on the yield from the production events can be accurately counted.
Description
Technical field
The present invention relates to the evaluation method in a kind of oil development field, the evaluation method of rate during particularly about a kind of oil well production.
Background technology
Rate when oil field adopts switch well conventionally (traditionally also referred to as production time efficiency) is evaluated oil well production operation level, and its circular is the actual well opening time of oil well and the ratio of calendar time.This evaluation method has some limitations, and its evaluation result can not reflect the actual production level of oil well effectively.For example certain oil well is limited the production by the impact of production event, and output is by 100m
3/ d is down to 50m
3/ d, but the production time is normal, the evaluation result that while utilizing traditional mode of production in this situation, the evaluation method of rate calculates is 100%, and in fact oil well exists production loss, and when during now by traditional mode of production, rate evaluation method is resulting, rate just can not reflect the actual production level of oil well.
Summary of the invention
For the problems referred to above, the evaluation method of rate while the object of this invention is to provide a kind of oil well production that can reflect the true production level of oil well.
For achieving the above object, the present invention is by the following technical solutions: the evaluation method of rate during a kind of oil well production, comprise the following steps: 1) all production events in oil field are divided into Job events and the large class of non-Job events two, Job events refers to the event within supvr scope of offical duty, and supvr should be responsible to the generation of event; Non-Job events refers to the event that causes production loss outside supvr's range of control; Job events Further Division is inside the plan Job events and Job events outside the plan, inside the plan Job events be operator with clear and definite object and the Job events of implementing plan, Job events outside the plan is mainly the unexpected incidents that oil field occurs; 2) determine the nominal output of oil well; 3) calculate oil well synthetic job efficiency, it equals the ratio of oil well actual output and its nominal output.
Described step 2), in, the following six kinds of situations that are divided into of the nominal output of oil well are calculated: 1. oil well is normally produced, and is not produced events affecting, and nominal output just equals its actual output; 2. oil well is subject to producing events affecting and output changes, choose the metastable time period of previous output of event generation, get interior average output of this time period as oil well nominal output, if the actual output of the nominal output of calculating is greater than this event while occurring oil well, thinks and has the loss of synthetic job efficiency; If 3. oil well is subject to producing events affecting and closes down, but its actual output is not less than the oil well nominal output of calculating according to 2., and its nominal output is directly converted by well opening time; If 4. oil well acutely cannot find the time period of a stable yield because of nonproductive event factor change of production, directly according to well opening time, convert its nominal output; 5. oil well is carried product after event occurs, and in this event procedure, output thinks there is no synthetic job loss in efficiency after reaching according to circumstances 2. definite nominal output, and nominal output equals its actual output; 6. oil well carries out the underproduction after event occurs, or output do not return to event and occur before level, in this event procedure before oil well reaches stable rate, the stable rate before its nominal output still occurs according to event is calculated.
The present invention is owing to taking above technical scheme, it has the following advantages: 1, the present invention adopts and take synthetic job efficiency that output is core and replace rate while take the traditional switch well that the time is core, more scientific and reasonable in theoretical foundation, can directly reflect oil field actual production level, also can the impact of accurate statistics production event on output.2, the inventive method can be used in prediction field output, when prediction, the definite Main Basis of synthetic job efficiency is to the analysis of production plan and historical events statistics, wherein, the production loss that inside the plan Job events causes is mainly calculated according to established production plan, Job events outside the plan and non-Job events are mainly definite by historical statistics rule, and this method can subtract the recovery prediction error that hour rate factor causes.3, the present invention can be take individual well, oil reservoir or oil field as unit in event statistics, to meet the needs in different scales oil field.
Accompanying drawing explanation
Fig. 1 is normal production and oil well nominal output calculation specifications schematic diagram when output is subject to events affecting and reduces in the embodiment of the present invention;
Fig. 2 be in the embodiment of the present invention oil well be subject to producing events affecting is closed down but output without oil well nominal output calculation specifications schematic diagram in obvious reduction situation;
Fig. 3 be in the embodiment of the present invention oil well be subject to producing events affecting is closed down but event occur before oil well nominal output calculation specifications schematic diagram in the violent situation of change of production;
Fig. 4 is that in the embodiment of the present invention, oil well is carried oil well nominal output calculation specifications schematic diagram in product situation after event occurs;
Fig. 5 is that in the embodiment of the present invention, oil well carries out oil well nominal output calculation specifications schematic diagram in underproduction situation after event occurs.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
The evaluation method of rate while the invention provides a kind of oil well production, it comprises the following steps:
1) all production events in oil field are classified
The all production events in oil field are divided into Job events and the large class of non-Job events two.
Job events refers to the event within supvr scope of offical duty, and supvr should be responsible to the generation of event.Job events Further Division is inside the plan Job events and Job events outside the plan.Wherein, inside the plan Job events be operator with clear and definite object and the Job events of implementing plan, the event such as drilling well and operation, plant maintenance and inspection, system perfecting and upgrading, oil field are planned, close down; Job events outside the plan is mainly the unexpected incidents that oil field occurs, and as system equipment fault, Leakage Gas, human operational error etc., can reduce the probability of its generation by promoting field management operation level.
Non-Job events refers to the event that causes production loss outside supvr's range of control, also can be subdivided into non-Job events inside the plan and outside the plan, inside the plan non-Job events comprises government's specific (special) requirements, the maintenance of downstream gas-processing plant etc., and Job events outside the plan comprises that nature resists factor (storm, earthquake, tsunami) etc.
On the basis of above principle of classification, each oil field can be according to actual conditions to the further exhaustive division of production event.
2) determine the nominal output of oil well
Oil well nominal output is defined as the oil well normal volume of eliminating while producing events affecting, does not consider the impact of putting forward the factors such as product, production rate decline that geological reservoir reason causes.The computing method of oil well nominal output specifically can be divided into following six kinds of situations:
1. oil well is normally produced, and is not produced events affecting, and nominal output just equals its actual output.
2. oil well is subject to producing events affecting, and output changes, and chooses the metastable time period of previous output (being generally 5-10 days, depending on actual conditions) of event generation, gets interior average output of this time period as oil well nominal output.If the actual output of the nominal output of calculating is greater than this event while occurring oil well, thinks and has the loss of synthetic job efficiency.
If 3. oil well is subject to producing events affecting and closes down, but its actual output is not less than the oil well nominal output of calculating according to 2., and its nominal output is directly converted by well opening time.
If 4. oil well for example, because of nonproductive event factor change of production violent (new well drives a well the initial stage), cannot find the time period of a stable yield, directly according to well opening time, convert its nominal output.
5. oil well is carried product after event occurs, in this event procedure, output reaches according to circumstances 2. definite nominal output (according to the stable rate for before event generation) and thinks afterwards there is no synthetic job loss in efficiency, and nominal output equals its actual output.
6. oil well carries out the underproduction after event occurs, or output do not return to event and occur before level, in this event procedure before oil well reaches stable rate, the stable rate before its nominal output still occurs according to event is calculated.
According to the computing method in above-mentioned various situations, obtain the nominal output of oil well.
3) calculate oil well synthetic job efficiency
Synthetic job efficiency, its specific definition is oil well actual output and the ratio of its nominal output.When it and traditional mode of production, the difference of the maximum of rate is to replace the loss of time with production loss, and its result of calculation more can reflect the true production level of oil well, and the difference of nominal output and actual output is the production loss that production event causes.
According to definite event type, carry out statistic of classification, can obtain production loss that all kinds of production events cause and the synthetic job efficiency in individual well, oil reservoir and oil field.
Below by a specific embodiment, effect of the present invention is described.
A oil field is deep water volatility oil field, and depth of water 1300m adopts floating production and storage handler (FPSO) to produce, and in the mode of early-stage waterflooding gas injection, maintenance reservoir pressure, develops.While adopting oil well production of the present invention, the evaluation method of rate is evaluated the production time efficiency in A oil field, and concrete steps are as follows:
1) all production events in oil field are classified
The all production events of statistics A oil field since going into operation, combing goes out 35 class production events altogether, and this 35 class production event is divided into Job events and the large class of non-Job events two; According to event, belonging to inside the plan operation or unexpected generation, is inside the plan Job events and Job events outside the plan by Job events Further Division.Wherein, inside the plan Job events comprises drilling well and Job events, maintenance and inspection event, system perfecting and construction event, oil reservoir and well services event, safety and production operation event.Concrete classification situation is in Table 1:
The classification of table 1 A field produces event
2) determine the nominal output of oil well
According to the meaning of synthetic job efficiency, in conjunction with the practical condition in A oil field, for A oilfield nominal output definite, illustrate as follows:
1. oil well is normally produced, and is not produced events affecting, and its nominal output just equals actual output.As Fig. 1,8-15 day in January, 2012, A-1 well production rate is produced events affecting, and its nominal output just equals actual output, and every day, synthetic job efficiency was 100%.
If 2. oil well output is subject to producing events affecting, choose the metastable time period of previous output (being generally 5-10 days, depending on actual conditions) of Time To Event point, get interior average output of this time period as oil well nominal output.As shown in Figure 1, on January 16th, 2012, A-1 well carried out pressure buildup test, the same day actual produce oil 1017m
3, according to oil well production curve, test 8-15 day A-1 well production rate in front January is comparatively stable, so with this section of time average output 2380m
3be the nominal output of A-1 well on the 16th, the same day is because of pressure buildup test loss oil mass 2380-1017=1363m
3, A-1 well synthetic job efficiency is 1017/2380 * 100%=42.7%.
If 3. oil well is subject to producing events affecting and closes down, but its actual output is not less than the oil well nominal output of calculating according to 2., and its nominal output is directly converted by well opening time.As shown in Figure 2, on October 17th, 2012, A-2 well was closed down 1.34 hours because of unknown event, but the same day actual output 2220m
3higher than according to 2. definite oil well nominal output 1900m of rule
3, A-2 well nominal output on the 17th is 2220/ (24-1.34) * 24=2351m
3, synthetic job efficiency is 2220/2351 * 100%=94.4%.
If 4. the change of production of oil well violent (nonproductive events affecting), such as new well drives a well the initial stage, cannot find the time period of a stable yield, directly according to well opening time, convert its nominal output.As shown in Figure 3, on January 8th, 2013, A-3 well was closed down 3.6 hours because of fault, but this well drove a well January 4, still in carrying the product stage, change of production is comparatively violent, be difficult to 2. determine its nominal output according to rule, at this moment, directly according to its well opening time conversion nominal output, 8 days A-3 well nominal outputs are 357/ (24-3.6) * 24=442m
3, synthetic job efficiency is 357/442 * 100%=80.8%.
5. oil well is carried product after event occurs, in this event procedure, output reach according to rule 2. definite nominal output (according to the stable rate for before event generation) think afterwards there is no synthetic job loss in efficiency, nominal output equals its actual output.As shown in Figure 4, play A-4 well on January 18th, 2013 and close down 7 days because changing pump operation, before operation, oil well stable rate is 500m
3/ d, progressively carries and producing to 800m after within 25th, driving a well
3/ d, wherein actual output 300m on the 25th
3, A-4 well nominal output on the 25th is 500m
3, synthetic job efficiency is 300/500 * 100%=60%; Actual output 500m on the 26th
3, reach according to the definite nominal output of stable rate before operation, 26 to 29 oil wells reach 800m
3nominal output before/d stable rate is equal to its actual output, and synthetic job efficiency is 100%.
6. oil well carries out the underproduction after event occurs, or output do not return to event and occur before level, in this event procedure before oil well reaches stable rate, the stable rate before its nominal output still occurs according to event is calculated.As shown in Figure 5, play A-5 well on February 9th, 2013 and close down 3 days because of fault, stable rate 900m before closing well
3/ d, drives a well and resumes production on the 12nd, within 15th, plays stable yield at 800m
3/ d, does not return to the front level of closing well, and 12-14 day A-5 well nominal output is the 900m calculating according to stable rate before closing well
3, this three days oil well synthetic job efficiency are respectively 200/900 * 100%=22.2%, 400/900 * 100%=44.4%, 600/900 * 100%=66.7%.
3) calculate oil well synthetic job efficiency
Adjust the A field produces oil offtake of all kinds of production event losses in history, and converted as synthetic job loss in efficiency.Specifically, for inside the plan Job events, obtain the duration of all kinds of events and involve scope, such as each pigging operation affects a production loop, 12 hours every subjob duration; For Job events outside the plan and non-Job events, the average synthetic job loss in efficiency that since obtaining oil field and going into operation, passing event causes.By on Dec 31st, 2013, the production loss that all historical production events in A oil field cause amounted to 436.14 * 10
4m
3, historical nominal output sum is 4619.75 * 10
4m
3, average synthetic job efficiency 90.56%.Table 2 is depicted as A oil field go into operation since the synthetic job loss in efficiency statistics that causes of all kinds of production events:
Table 2A oil field is all kinds of production event loss synthetic job Efficiency Statistics since going into operation
The present invention adopts take synthetic job efficiency that output is core and replaces rate while take the traditional switch well that the time is core, more scientific and reasonable in theoretical foundation, can directly reflect oil field actual production level, also can the impact of accurate statistics production event on output.
The inventive method also can be for prediction field output.In oilfield production forecast, the definite Main Basis of synthetic job efficiency is to the analysis of production plan and historical events statistics.Wherein, the production loss that inside the plan Job events causes is mainly calculated according to established production plan, and Job events outside the plan and non-Job events are mainly determined by historical statistics rule.The recovery prediction error that when this method has reduced, rate factor causes.
The present invention can be take individual well, oil reservoir or oil field as unit in event statistics, to meet the needs in different scales oil field.
The various embodiments described above are only for illustrating the present invention, and wherein implementation step of method etc. all can change to some extent, and every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.
Claims (2)
1. the evaluation method of rate during an oil well production, comprise the following steps: 1) all production events in oil field are divided into Job events and the large class of non-Job events two, Job events refers to the event within supvr scope of offical duty, and supvr should be responsible to the generation of event; Non-Job events refers to the event that causes production loss outside supvr's range of control; Job events Further Division is inside the plan Job events and Job events outside the plan, inside the plan Job events be operator with clear and definite object and the Job events of implementing plan, Job events outside the plan is mainly the unexpected incidents that oil field occurs; 2) determine the nominal output of oil well; 3) calculate oil well synthetic job efficiency, it equals the ratio of oil well actual output and its nominal output.
2. the evaluation method of rate during a kind of oil well production as claimed in claim 1, is characterized in that: described step 2), the following six kinds of situations that are divided into of the nominal output of oil well are calculated:
1. oil well is normally produced, and is not produced events affecting, and nominal output just equals its actual output;
2. oil well is subject to producing events affecting and output changes, choose the metastable time period of previous output of event generation, get interior average output of this time period as oil well nominal output, if the actual output of the nominal output of calculating is greater than this event while occurring oil well, thinks and has the loss of synthetic job efficiency;
If 3. oil well is subject to producing events affecting and closes down, but its actual output is not less than the oil well nominal output of calculating according to 2., and its nominal output is directly converted by well opening time;
If 4. oil well acutely cannot find the time period of a stable yield because of nonproductive event factor change of production, directly according to well opening time, convert its nominal output;
5. oil well is carried product after event occurs, and in this event procedure, output thinks there is no synthetic job loss in efficiency after reaching according to circumstances 2. definite nominal output, and nominal output equals its actual output;
6. oil well carries out the underproduction after event occurs, or output do not return to event and occur before level, in this event procedure before oil well reaches stable rate, the stable rate before its nominal output still occurs according to event is calculated.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070185662A1 (en) * | 2004-10-18 | 2007-08-09 | Sinergia Techologies, Inc. | Correlation method for measurements of total and fractional immiscible media flow rates and a device for its embodiment |
| CN103670348A (en) * | 2013-12-25 | 2014-03-26 | 中国石油天然气股份有限公司 | Evaluation method and device for oil well production characteristics |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070185662A1 (en) * | 2004-10-18 | 2007-08-09 | Sinergia Techologies, Inc. | Correlation method for measurements of total and fractional immiscible media flow rates and a device for its embodiment |
| CN103670348A (en) * | 2013-12-25 | 2014-03-26 | 中国石油天然气股份有限公司 | Evaluation method and device for oil well production characteristics |
Non-Patent Citations (1)
| Title |
|---|
| 武韦韦: "基于停井指数评价技术的油井生产效率优化研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
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Application publication date: 20140827 |