CN104100241B - A kind of definite hyposmosis oil well is taken out the method for system rationally - Google Patents
A kind of definite hyposmosis oil well is taken out the method for system rationally Download PDFInfo
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- 239000003129 oil well Substances 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 74
- 238000005086 pumping Methods 0.000 claims description 50
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- 238000004519 manufacturing process Methods 0.000 claims description 18
- 210000001635 urinary tract Anatomy 0.000 claims description 12
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- 239000012530 fluid Substances 0.000 abstract description 6
- 238000012937 correction Methods 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
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- 230000009189 diving Effects 0.000 description 1
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Abstract
A kind of definite hyposmosis oil well of the present invention is taken out the method for system rationally, relate to petrochemical industry, is specifically related to a kind of definite hyposmosis oil well and takes out rationally the method for system. Plant definite hyposmosis oil well and rationally, take out the method for system, adopt following steps: draw IPR curve; Draw out pump efficiencyRelation curve with liquid level h; Determine well opening time T; Determine well downtime T2; Between calculating oil well, the cycle of taking out is T+T2; Obtain the cycle of taking out between low-permeability oil and pair between take out the correction in cycle. The present invention monitors continuously by poor efficiency well is carried out to producing fluid level; find out its producing fluid level Changing Pattern; determine the reasonable start and stop time of oil pumper according to method proposed by the invention; can guarantee that oil well pump moves in the situation that having enough fluid supply capacities, to reach tap the latent power output and energy-saving and cost-reducing object.
Description
Technical Field
The invention relates to the field of petrochemical industry, in particular to a method for determining a reasonable intermittent pumping system of a low-permeability oil well.
Background
In the development process of low permeability oil fields, the phenomenon that the liquid supply capacity of an oil well is insufficient along with the obvious reduction of formation energy is very common. Because the production and pumping are unbalanced, the pumping unit is in a low-efficiency working state for a long time, the energy waste is serious, the ineffective abrasion of equipment is aggravated, and the economic benefit is very low.
At present, each large oil field basically adopts an intermittent pumping mode to produce low-efficiency wells, but for the convenience of management, a uniform and fixed intermittent pumping system is generally adopted. The start and stop of the pumping unit are generally controlled by installing a time controller at a wellhead, and the time controller generally controls the working time of the pumping unit by a preset time interval. This control is actually a manual control, where the time intervals are determined empirically, and without consideration of the actual downhole fluid supply, it is possible to create two situations: firstly, the interval time is set to be too short, so that the liquid level in the underground well is not recovered and the production starts at a reasonable position, and the waste of electric energy is caused; and secondly, the interval time is set to be too long, so that the underground liquid level reaches a reasonable position and the production is not carried out in time, the effective production time of the oil well is shortened, the yield of the oil well is reduced, and the production capacity of the oil well cannot be exerted. The uniform and fixed intermittent pumping system is not beneficial to diving and energy saving, so that different intermittent pumping systems are adopted according to different inefficient wells to be specifically analyzed according to specific well conditions.
Disclosure of Invention
The invention aims to provide a novel method for scientifically making a reasonable production period suitable for a low-permeability oil reservoir.
A method for determining a reasonable pumping system of a low-permeability oil well comprises the steps of closing the oil well for T2 and opening the oil well for T; wherein,
well shut-in time T2: after the oil well is shut in, measuring the liquid level of the oil well and drawing a change curve of the liquid level h of the oil well along with time t, when the liquid level rises to a certain value, the rising speed gradually becomes slow, namely the delta h change amount begins to approach 0 within the delta t time, the slope of the curve after the turning point of the slow change is between 0 and 0.05, and the time from the shut in of the oil well to the turning point is the shut in time of the oil well.
Well opening time T of the oil well: and after the oil well is pumped, measuring the liquid level of the oil well and drawing a change curve of the liquid level h of the oil well along with time t, wherein the lowest reasonable submergence degree of the liquid level is 10m, and the time from the pumping of the oil well to the liquid level descending to the lowest reasonable submergence degree of 10m is the well opening time of the oil well.
The method comprises the following steps:
step 1: after the oil well is shut down, any time interval is calculated according to the change curve of the liquid level h of the oil well along with the time tDrawing a relation curve of the flow q and the pressure p, namely an IPR curve;
step 2: after the oil well is opened, calculating any time interval according to the variation curve of the oil well liquid level h along with the time tLower pump efficiencyAnd draw out the pump efficiencyA curve relating to the height h of the liquid level;
and step 3: calculating the well opening time T of the oil well: when no liquid exists in the oil sleeve ring, the oil well pump reaches the minimum submergence degree by 10m and is combined with the yield of the previous day of pumping between oil wells; according to the results in the step 1 and the step 2, the following calculation formula is adopted:
；
wherein T is the well opening time, ql(t) oil casing annulus flow rate; ap is the plunger area of the oil well pump, S is the stroke of the oil pumping unit, n is the stroke frequency, D is the inner diameter of the sleeve, D is the outer diameter of the oil pipe,is the formation flow rate; determining the well opening time T;
and 4, step 4: calculation of well shut-in time T2: after the oil well is shut down, calculating the slope of any point in the change curve of the liquid level h of the oil well along with the time t until the slopes after the point are all between 0 and 0.05, and pumping from the oil well at the point;
and 5: calculating the interval pumping period of the oil well as T + T2; obtaining a reasonable low-permeability oil interval pumping period;
step 6: for the interval pumping period determined by the above method, the original oil well liquid production amount Q should be verifiedLiquid for treating urinary tract infectionWhether the variation is less than or equal to 10% is judged by the following formula:
if Q isLiquid for treating urinary tract infectionThe change is less than or equal to 10%, and the interval pumping period determined by the steps is reasonable; if QLiquid for treating urinary tract infectionVariations in>And 10%, determining the well opening time T and the well closing time T2 again according to the steps 1-5 until QLiquid for treating urinary tract infectionThe change is ≦ 10%.
Or preferably, the pumping in step 2The calculation formula of (2) is as follows:
。
the invention has the technical effects that:
by continuously monitoring the working fluid level of the low-efficiency well and finding out the change rule of the working fluid level, the reasonable starting and stopping time of the pumping unit is determined according to the method provided by the invention, and the purposes of excavating potential output, saving energy and reducing consumption are achieved.
Drawings
FIG. 1 is a schematic flow chart of IPR curve drawing after the well is shut in.
FIG. 2 is a diagram of pumping efficiency after the well is openedA flow chart of a relation curve with the liquid level h.
FIG. 3 is a schematic flow chart for determining the well opening time T.
FIG. 4 is a schematic flow chart of determining the well shut-in time T2.
FIG. 5 is a schematic flow chart of a reasonable low permeability oil extraction system.
Fig. 6 is a graph of the well level h as a function of time t after the well has been shut in.
Fig. 7 is a graph of flow rate q versus time t.
Fig. 8 is a graph of pressure p versus time t.
FIG. 9 is a graph of flow pressure versus production (IPR curve).
Fig. 10 is a graph of the well level h as a function of time t after the well is opened.
FIG. 11 shows pumping efficiency after well is openedCurve with liquid level h.
Detailed Description
The method is described in the following with reference to an example of a well. 23XX well, which is pumped intermittently due to low production, and the production time of the well is 8: 00-20: 00 and is stopped for 12 hours at present; the well is opened for production for 12 hours from 20:00 to 8:00 am on the next day, and 24 hours is an interval pumping period; the production of the well before the interval pumping is 1.5m3The production of the oil well after the interval pumping is 1.1m3(ii) a The stroke is 1.2m, the stroke frequency is 5 times/min, and the pump diameter is a 44mm whole cylinder pump; the inner diameter of the oil pipe is 62 mm; the internal diameter of the sleeve is 124 mm.
Well shut-in time T2: after the well of the oil well is shut in, the liquid level of the oil well is measured, a change curve of the liquid level h of the oil well along with time t is drawn, when the liquid level rises to a certain value, the rising speed gradually becomes slow, namely the delta h change amount begins to approach 0 within the delta t time, the slope of the slow turning point is between 0 and 0.05, and the time from the well shut in of the oil well to the turning point is the well shut in time of the oil well.
Well opening time T of the oil well: and after the oil well is pumped, measuring the liquid level of the oil well and drawing a change curve of the liquid level h of the oil well along with time t, wherein the lowest reasonable submergence degree of the liquid level is 10m, and the time from the pumping of the oil well to the liquid level descending to the lowest reasonable submergence degree of 10m is the well opening time of the oil well.
Step 1: after the well is shut down, the liquid level of the well is measured, the change curve of the liquid level h of the well along with the time t is drawn, and any time interval is calculated as shown in figure 6Drawing a relation curve of the flow q and the pressure p, namely an IPR curve, and the flow is shown in the figure 1; the method comprises the following steps:
step 1-1: shutting down the oil well;
step 1-2: continuously measuring the liquid level of the oil well by using an instrument;
step 1-3: drawing a change curve of the liquid level h with the time t according to the liquid level data measured in the step 1-2, wherein the slope of the liquid level h is between 0 and 0.05 after the point M as shown in fig. 6, namely the change of the liquid level h is small, and M is set as a well closing stopping point; the time between the two is the well closing time T2;
step 1-4: time interval of two adjacent points in the graph of FIG. 6Difference in height of liquid level；
Step 1-5: is calculated atLiquid level in timeThe bottom hole flow q and pressure p;
step 1-6: repeating the steps 1-4 and 1-5, calculating a series of bottom hole flow qi and pressure pi, and drawing a relation curve of the flow q and the time t, as shown in fig. 7; bottom hole pressure p versus time t, as shown in FIG. 8;
step 1-7: a pressure p versus flow q curve (IPR curve) was obtained as shown in fig. 9.
Step 2: after the oil well is opened, measuring the liquid level of the oil well, drawing a change curve of the height h of the liquid level of the oil well along with the time t, and calculating any time intervalLower pump efficiencyAnd draw out the pump efficiencyA curve relating to the height h of the liquid level; the flow is shown in FIG. 2;the method comprises the following steps:
step 2-1: opening the oil well;
step 2-2: continuously measuring the liquid level of the oil well by using an instrument;
step 2-3: drawing a change curve of the liquid level height h along with the time t according to the liquid level data measured in the step 2-2, as shown in FIG. 10;
step 2-4: the time interval between two adjacent points is taken in the curve of the change of the liquid level h with the time t in FIG. 10Difference in height of liquid level；
Step 2-5: computingLower pump efficiency；
；
Step 2-6: draw out the pump efficiencyFIG. 11 shows the relationship between the height h of the liquid surface and the liquid level.
And step 3: calculating the well opening time T of the oil well: as shown in fig. 3; the method comprises the following steps:
step 3-1: after the oil well is pumped, when the liquid level is lowered to the lowest reasonable submergence degree of 10m, the well is closed;
step 3-2: when no liquid exists in the oil sleeve ring, the oil well pump reaches the minimum submergence degree of 10m and is combined with the yield of the previous day of pumping between oil wells; according to the results in the step (1) and the step (2), the following calculation formula is adopted:
(ii) a Formula (1);
wherein T is the well opening time, and q1(T) is the oil casing annular flow; ap is the plunger area of the oil well pump, S is the stroke of the oil pumping unit, n is the stroke frequency, D is the inner diameter of the sleeve, D is the outer diameter of the oil pipe,is the formation flow rate;
step 3-2: transforming the formula to obtain the following formula:
(ii) a Calculating by using a numerical difference method; formula (2);
step 3-4: and obtaining the well opening time T. Example data was taken in and the calculated open time T =4 hours.
And 4, step 4: calculation of well shut-in time T2: as shown in fig. 4;
step 4-1: after the oil well is shut down, a point P is arbitrarily selected from a change curve of the liquid level h of the oil well along with the time t;
step 4-2: by passingCalculating the slope of the sample;
step 4-3: judging whether the slope of the point P is between 0 and 0.05, if so, executing the step 4-4, otherwise, returning to the step 4-1 for iterative correction;
step 4-4: if the slope of the point P is greater than 0.05, pumping the oil well;
and 4-5: the time is the closing time T2 of the oil well. Example data was taken in, and the calculated shut-in time T2=7 hours.
And 5: calculating the interval pumping period of the oil well as T + T2; obtaining a reasonable low-permeability oil indirect pumping system; the flow is shown in FIG. 5;
step 5-1: obtaining the well opening time T and the well closing time T2 obtained in the previous steps 3-4 and 4-5 to obtain an interval pumping period;
step 5-2: for the interval pumping period determined by the method, the original well liquid production quantity Q of the oil is ensuredLiquid for treating urinary tract infectionWhether the variation is less than or equal to 10% is judged by the following formula:
(ii) a Formula (3);
step 5-3: if QLiquid for treating urinary tract infectionThe variation is less than or equal to 10%, and the interval pumping period determined by the method is reasonable; if QLiquid for treating urinary tract infectionVariations in>10%, re-determining the well opening time T and the well closing time T2 according to the steps 1 to 5-1; up to QLiquid for treating urinary tract infectionThe change is ≦ 10%;
step 5-4: calculating to obtain reasonable well opening time T =5.5 hours and well closing time T2=6 hours;
step 5-5: for convenient field operation, determining the final well opening time T =6 hours and the final well closing time T2=6 hours; 12 hours is one spot cycle, and two spot cycles may be performed 24 hours per day. The production of the well before the interval pumping was 1.5m3The production of the oil well after the interval pumping is 1.45m3。
Compared with the previous pumping period, only one pumping period can be implemented 24 hours per day, and the yield of the oil well before pumping is 1.5m3The production of the oil well after the interval pumping is 1.1m3The period of time required for extraction is shortened, but the yield change is smaller after the extraction system is implemented, so that the excavating machine can dig more greatlyAnd (4) oil well capacity.
Claims (1)
1. A method for determining a reasonable pumping system of a low-permeability oil well comprises the well shut-in time T2 and the well open-up time T, wherein,
well shut-in time T2: after the oil well is shut in, measuring the liquid level of the oil well and drawing a change curve of the liquid level h of the oil well along with time t, wherein when the liquid level rises to a certain value, the rising speed gradually slows, namely the delta h change amount begins to approach 0 within the delta t time, the slope of the curve after the gradual inflection point is between 0 and 0.05, and the time from the shut in of the oil well to the inflection point is the shut in time of the oil well;
well opening time T of the oil well: after the oil well is pumped, measuring the liquid level of the oil well and drawing a change curve of the liquid level h of the oil well along with time t, wherein the lowest reasonable submergence degree of the liquid level is 10m, and the time from the pumping of the oil well to the liquid level descending to the lowest reasonable submergence degree of 10m is the well opening time of the oil well;
the method is characterized by comprising the following steps:
step 1: after the oil well is shut down, any time interval is calculated according to the change curve of the liquid level h of the oil well along with the time tDrawing a relation curve of the flow q and the pressure p, namely an IPR curve;
step 2: after the oil well is opened, calculating any time interval according to the variation curve of the oil well liquid level h along with the time tLower pump efficiencyAnd draw out the pump efficiencyA curve relating to the height h of the liquid level;
wherein the pump effectThe calculation method is as follows:
；
and step 3: calculating the well opening time T of the oil well: when no liquid exists in the oil sleeve ring, the oil well pump reaches the minimum submergence degree by 10m and is combined with the yield of the previous day of pumping between oil wells; according to the results in the step 1 and the step 2, the following calculation formula is adopted:
；
wherein T is the well opening time, ql(t) oil casing annulus flow rate; ap is the plunger area of the oil well pump, S is the stroke of the oil pumping unit, n is the stroke frequency, D is the inner diameter of the sleeve, D is the outer diameter of the oil pipe,is the formation flow rate; determining the well opening time T;
and 4, step 4: calculation of well shut-in time T2: after the oil well is shut down, calculating the slope of any point in the change curve of the liquid level h of the oil well along with the time t until the slopes after the point are all between 0 and 0.05, and pumping from the oil well at the point;
and 5: calculating the interval pumping period of the oil well as T + T2; obtaining a reasonable low-permeability oil interval pumping period;
step 6: for the interval pumping period determined by the above method, the original oil well liquid production amount Q should be verifiedLiquid for treating urinary tract infectionWhether the variation is less than or equal to 10% is judged by the following formula:
；
if QLiquid for treating urinary tract infectionThe change is less than or equal to 10%, and the interval pumping period determined by the steps is reasonable; if QLiquid for treating urinary tract infectionVariations in>And 10%, determining the well opening time T and the well closing time T2 again according to the steps 1-5 until QLiquid for treating urinary tract infectionThe change is ≦ 10%.
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| CN106285572B (en) * | 2016-10-17 | 2019-02-22 | 北京安控科技股份有限公司 | Control device and its control method are taken out between a kind of pumping unit intelligence |
| CN106837298A (en) * | 2016-12-30 | 2017-06-13 | 中国石油天然气股份有限公司 | Method for determining interval production time of oil well with low liquid production amount |
| CN107608940B (en) * | 2017-08-28 | 2020-08-07 | 中国石油天然气股份有限公司 | Method for determining oil well interval pumping period |
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| CN108278104B (en) * | 2018-01-26 | 2020-03-31 | 陕西延长石油(集团)有限责任公司研究院 | Oil well interval pumping method for low-permeability oil field |
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| CN112112604B (en) * | 2019-06-19 | 2023-02-24 | 中国石油天然气股份有限公司 | Method and device for controlling pumping rows between low-permeability oil wells |
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| CN112112627B (en) * | 2020-09-05 | 2022-11-04 | 百恒石油装备有限公司 | Method for detecting oil well production parameters under digital condition |
| CN112682008A (en) * | 2020-12-11 | 2021-04-20 | 中国石油天然气股份有限公司 | Oil well intermittent pumping method and oil well intermittent pumping device |
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| US5189388A (en) * | 1991-03-04 | 1993-02-23 | Mosley Judy A | Oil well pump start-up alarm |
| CN2937552Y (en) * | 2006-08-23 | 2007-08-22 | 牡丹江石油工具有限责任公司 | Automatic batch-type pumping device |
| CN103422851B (en) * | 2012-05-21 | 2016-08-03 | 王双全 | Oil well pump dynamic degree of filling well testing determines interval pumping system method |
| CN203114254U (en) * | 2013-03-13 | 2013-08-07 | 中国石油天然气股份有限公司 | Remote automatic control device for intermittent pumping well |
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