CN114647918A - Method and system for identifying oil thickening and wax deposition working conditions of oil pumping well - Google Patents
Method and system for identifying oil thickening and wax deposition working conditions of oil pumping well Download PDFInfo
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- 238000005086 pumping Methods 0.000 title claims abstract description 29
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- 239000003129 oil well Substances 0.000 claims abstract description 36
- 238000013016 damping Methods 0.000 claims abstract description 30
- 239000000725 suspension Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000001556 precipitation Methods 0.000 claims abstract description 11
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Abstract
The invention belongs to the technical field of oil and gas field development, and particularly relates to a method and a system for identifying the working conditions of oil thickening and wax precipitation of a rod-pumped well. The identification method comprises the following steps: acquiring oil well sucker rod column combination parameters; acquiring working fluid level, stroke frequency, wellhead back pressure, wellhead casing pressure and water content parameters of an oil well; acquiring a current ground indicator diagram of an oil well, and acquiring the maximum load and the minimum load of a suspension point of a current oil pumping unit; calculating the comprehensive damping coefficient of the target oil well; and comparing and analyzing the calculated comprehensive damping coefficient with the limit value determined by the oil field. The method realizes the judgment of the working conditions of oil thickening and wax deposition by simply and conveniently calculating the comprehensive damping coefficient, has more accurate judgment result and simple process.
Description
Technical Field
The invention belongs to the technical field of oil-gas field development, and particularly relates to a method and a system for identifying the working conditions of oil thickening and wax deposition of an oil pumping well.
Background
The oil pumping machine lifting system is the most common artificial lifting mode in China. With the development of digital, information and intelligent construction of oil fields, more and more pumping wells are provided with various sensors, and parameters such as ground indicator diagrams, current, voltage, wellhead pressure and temperature are collected in real time, so that a foundation is provided for field engineers to carry out rapid diagnosis and measure decision on the working conditions of the oil wells.
At present, the methods such as an area method, a matching method, a grid method, a vector method, a direction chain code method and the like are often used on site to extract the characteristics of a ground indicator diagram or an underground pump diagram, and then the theoretical characteristics of typical working conditions are combined to judge the working conditions of an oil well.
Oil thickening and wax deposition are special working conditions frequently encountered in the production of the pumping well and are key monitoring and management objects in the production management of the oil well. The working condition change is judged only by manpower, so that the workload is large, managers are required to have higher technical level and experience, and erroneous judgment or missing judgment is easily caused. At present, a simple and effective method for judging the working conditions of oil thickening and wax deposition does not exist.
Disclosure of Invention
The method realizes judgment of the working conditions of oil thickening and wax deposition by simply and conveniently calculating the comprehensive damping coefficient, has more accurate judgment result and simple process, and makes up the blank of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for identifying the working conditions of oil thickening and wax deposition of an oil pumping well, which comprises the following steps:
acquiring oil well sucker rod column combination parameters;
acquiring working fluid level, stroke frequency, wellhead back pressure, wellhead casing pressure and water content parameters of an oil well;
acquiring a current ground indicator diagram of an oil well, and acquiring the maximum load and the minimum load of a suspension point of a current oil pumping unit;
calculating the comprehensive damping coefficient of the target oil well;
and comparing and analyzing the calculated comprehensive damping coefficient with the limit value determined by the oil field.
Further, if the calculated comprehensive damping coefficient is larger than the limit value determined by the oil field, the working condition of oil thickening or wax precipitation is judged; otherwise, the well is judged to be in a normal working condition.
Further, the obtained oil well sucker rod column combination parameters comprise the number of stages, the diameter and the length of the sucker rod; and reading the parameters of the depth and the diameter of the lower pump and the oil-gas-water density.
Further, the calculation formula of the friction load epsilon borne by the up-down stroke is as follows:
ε＝Fu+Fd＝Pmax-Pmin-Wl-frLgρl-2Pv-2Fbg-phfp+pifp
in the formula: ε -the frictional load on the up and down stroke, N; fu、Fd-maximum friction load in up and down stroke, N; pmax、Pmin-maximum, minimum load of suspension point, N; wl-a liquid column load, N, acting on the plunger; f. ofr-sucker rod cross-sectional area, m2(ii) a L-sucker rod column length, m; g-acceleration of gravity, m/s2；ρlDensity of the pumped liquid, kg/m3；fpPlunger cross-sectional area, m2；ph-wellhead back pressure, Pa; p is a radical ofi-a pump inlet pressure, Pa; fbgSemi-dry friction, N, between the plunger and the pump barrel.
Further, the vibration load PvThe calculation formula of (c) is:
in the formula: pv-a vibration load, N; e-the elastic modulus of the sucker rod, Pa; a-the propagation velocity of the elastic wave in the sucker rod string, m/s; v-relative movement speed of the lower end of the sucker rod string to the suspension point at the end of the initial deformation period, m/s.
Further, a half-dry friction force F between the plunger and the pump barrelbgThe calculation formula is as follows:
in the formula: fbgSemi-dry friction between plunger and pump barrel, N; d-the diameter of the plunger of the oil well pump is mm; delta-clearance on the radius of the plunger bushing pair, mm.
And further, determining a limit value according to field oil thickening and wax precipitation well data calculation and statistical analysis.
The invention also provides a system for identifying the working conditions of oil thickening and wax deposition of the oil pumping well, which comprises the following components:
the data acquisition module is used for acquiring the stage number, the diameter and the length of the sucker rod of the target oil well; reading parameters of the depth and the diameter of the lower pump, parameters of oil gas and water density, parameters of the working fluid level, stroke frequency, wellhead back pressure, wellhead casing pressure and water content of a target oil well, and maximum load and minimum load of a suspension point of the current oil pumping unit;
a data processing module:
the half-dry friction force F between the plunger and the pump barrel was calculated using the following modelbg：
In the formula: fbgSemi-dry friction between plunger and pump barrel, N; d-the diameter of the plunger of the oil well pump is mm; δ -clearance over plunger bushing pair radius, mm;
the vibration load P was calculated using the following modelv：
In the formula: pv-a vibration load, N; e-the elastic modulus of the sucker rod, Pa; a-the propagation velocity of the elastic wave in the sucker rod string, m/s; v-the relative movement speed of the lower end of the sucker rod string to the suspension point at the end of the initial deformation period, m/s;
calculating the friction load epsilon applied to the lower stroke by using the following model:
ε＝Fu+Fd＝Pmax-Pmin-Wl-frLgρl-2Pv-2Fbg-phfp+pifp
in the formula: ε -the frictional load on the up and down stroke, N; fu、Fd-maximum friction load in up and down stroke, N; pmax、Pmin-maximum, minimum load of suspension point, N; w is a group ofl-a liquid column load, N, acting on the plunger; f. ofr-sucker rod cross-sectional area, m2(ii) a L-sucker rod column length, m; g-acceleration of gravity, m/s2；ρlDensity of the pumped liquid, kg/m3；fpPlunger cross-sectional area, m2；ph-wellhead back pressure, Pa; p is a radical ofi-a pump inlet pressure, Pa;
calculating the comprehensive damping coefficient of the target oil well by using the following model:
in the formula, Delta is the comprehensive damping coefficient, epsilon is the friction load on the up-down stroke, L is the length of the sucker rod column, vmaxIs the maximum motion speed of the suspension point, s is the stroke of the pumping unit, and n isThe stroke frequency of the oil pumping unit.
Oil thickening and wax precipitation working condition analysis module: comparing the calculated comprehensive damping coefficient with a limit value determined by the oil field, and judging the working condition of oil thickening or wax deposition if the calculated comprehensive damping coefficient is greater than the limit value determined by the oil field; otherwise, judging the well to be in a normal working condition.
Compared with the prior art, the invention has the following beneficial effects:
(1) the calculation of various frictional resistance on the sucker rod is considered as a comprehensive damping coefficient for processing, so that the difference of suspension point loads of the pumping units of different oil wells is reflected, the comprehensive damping coefficient of the oil-thickened and wax-deposited well is remarkably large, and the oil deposit and wax deposition can be judged and identified more accurately by the comprehensive damping coefficient; in practical application, the parameters are easy to obtain, and the calculation method is simple and convenient;
(2) the automatic judgment criterion of the working conditions of oil thickening and wax precipitation is combined with the field working experience, so that the judgment result is more accurate;
(3) the complex calculation process required by the existing ground indicator diagram working condition diagnosis is avoided, and the required parameters in the calculation process are less.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a flowchart of a method for identifying the oil-thickening and wax-deposition condition of a rod-pumped well according to an embodiment 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 invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
In order to make the technical solutions of the present invention more clearly understood by those skilled in the art, the technical solutions of the present invention will be described in detail below with reference to specific embodiments.
Example 1
As shown in fig. 1, the method for identifying the working conditions of oil thickening and wax deposition in the rod-pumped well comprises the following steps:
step 1: reading sucker rod column combination parameters of an oil well from an oil field production static database, wherein the parameters comprise the number of stages, the diameter and the length of a sucker rod; reading the depth and diameter parameters of the lower pump and the oil-gas-water density parameters;
step 2: reading the working fluid level, stroke frequency, well mouth back pressure, well mouth casing pressure and water content parameters of an oil well from an oil field production dynamic database;
and step 3: reading a current ground indicator diagram from an oil field production dynamic database, and acquiring the maximum load and the minimum load of a suspension point of a current oil pumping unit;
and 4, step 4: calculating the density of the oil well mixture by using the oil-gas-water density parameter read in the step 1 and the water-containing parameter read in the step 2;
and 5: calculating the total length of the sucker rod and the section area of each sucker rod according to the number of stages, the diameter and the length of the sucker rod read in the step 1; calculating the sectional area of the pump according to the pump diameter read in the step 1;
step 6: calculating the pressure of the pump inlet according to the wellhead casing pressure and working fluid level parameters read in the step 2 and the air tightness parameters read in the step 1;
and 7: calculating the semi-dry friction force F between the plunger and the pump barrel according to the formula (1)bg；
In the formula: fbgSemi-dry friction between the plunger and the cylinder, N; d-the diameter of the plunger of the oil well pump is mm; delta-clearance on the radius of the plunger bushing pair, mm.
And 8: calculating the vibration load according to formula (2);
in the formula: pv-a vibration load, N; e-the elastic modulus of the sucker rod, Pa; a-the propagation velocity of the elastic wave in the sucker rod string, m/s; v-the relative movement velocity of the lower end of the sucker rod string to the suspension point at the end of the initial deformation period (the movement velocity of the suspension point at the end of the initial deformation period when the lower end of the oil pipe is fixed), m/s.
And step 9: calculating the friction load on the upper stroke and the lower stroke according to a formula (3);
ε＝Fu+Fd＝Pmax-Pmin-Wl-frLgρl-2Pv-2Fbg-phfp+pifp (3)
in the formula: ε -the frictional load on the up and down stroke, N; fu、Fd-maximum friction load in up and down stroke, N; pmax、Pmin-maximum, minimum load of suspension point, N; wl-a liquid column load, N, acting on the plunger; f. ofr-sucker rod cross-sectional area, m2(ii) a L-sucker rod column length, m; g-acceleration of gravity, m/s2；ρlDensity of pumped liquid, kg/m3；fpPlunger cross-sectional area, m2；ph-wellhead back pressure, Pa; pv-a vibration load, N; p is a radical ofi-pump inlet pressure, Pa.
Step 10: calculating the current comprehensive damping coefficient of the well by using a formula (4);
in the formula, Delta is the comprehensive damping coefficient, epsilon is the friction load on the up-down stroke, L is the length of the sucker rod column, vmaxThe maximum motion speed of the suspension point is s is the stroke of the pumping unit, and n is the stroke frequency of the pumping unit.
Step 11: calculating and statistically analyzing according to the data of the field oil thickening and wax precipitation well, and determining a threshold value; comparing the calculated comprehensive damping coefficient with a limit value determined by the oil field; if the calculated comprehensive damping coefficient is larger than the limit value determined by the oil field, automatically judging the working condition of oil thickening or wax precipitation; otherwise, the well is judged to be in a normal working condition.
Example 2
A system for identifying the working conditions of oil thickening and wax deposition of an oil pumping well comprises:
the data acquisition module is used for acquiring the number of stages, the diameter and the length of the sucker rod of the target oil well; reading parameters of the depth and the diameter of the lower pump, parameters of oil gas and water density, parameters of the working fluid level, stroke frequency, wellhead back pressure, wellhead casing pressure and water content of a target oil well, and maximum load and minimum load of a suspension point of the current oil pumping unit;
a data processing module:
the half-dry friction force F between the plunger and the pump barrel was calculated using the following modelbg：
In the formula: fbgSemi-dry friction between the plunger and the cylinder, N; d-the diameter of the plunger of the oil well pump is mm; δ -clearance over plunger bushing pair radius, mm;
the vibration load P was calculated using the following modelv：
In the formula: pv-a vibration load, N; e-the elastic modulus of the sucker rod, Pa; a-the propagation velocity of the elastic wave in the sucker rod string, m/s; v-the relative movement speed of the lower end of the sucker rod string to the suspension point at the end of the initial deformation period, m/s;
calculating the friction load epsilon applied to the lower stroke by using the following model:
ε＝Fu+Fd＝Pmax-Pmin-Wl-frLgρl-2Pv-2Fbg-phfp+pidp
in the formula: ε -the frictional load on the up and down stroke, N; fu、Fd-maximum friction load in up and down stroke, N; pmax、Pmin-suspension point maximum, minimum load, N; w is a group ofl-a liquid column load, N, acting on the plunger; f. ofr-sucker rod cross-sectional area, m2(ii) a L-sucker rod column length, m; g-acceleration of gravity, m/s2；ρlDensity of the pumped liquid, kg/m3；fpPlunger cross-sectional area, m2；ph-wellhead back pressure, Pa; p is a radical ofi-a pump inlet pressure, Pa;
calculating the comprehensive damping coefficient of the target oil well by using the following model:
in the formula, Delta is the comprehensive damping coefficient, epsilon is the friction load on the up-down stroke, L is the length of the sucker rod column, vmaxThe maximum motion speed of the suspension point is s is the stroke of the pumping unit, and n is the stroke frequency of the pumping unit.
Oil thickening and wax precipitation working condition analysis module: determining a threshold value according to data calculation and statistical analysis of the field oil thickening and wax precipitation well; comparing the calculated comprehensive damping coefficient with a limit value determined by the oil field, and judging the working condition of oil thickening or wax deposition if the calculated comprehensive damping coefficient is greater than the limit value determined by the oil field; otherwise, judging the well to be in a normal working condition.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (8)
1. A method for identifying the working conditions of oil thickening and wax deposition of an oil pumping well is characterized by comprising the following steps:
acquiring oil well sucker rod column combination parameters;
acquiring working fluid level, stroke frequency, wellhead back pressure, wellhead casing pressure and water content parameters of an oil well;
acquiring a current ground indicator diagram of an oil well, and acquiring the maximum load and the minimum load of a suspension point of a current oil pumping unit;
calculating the comprehensive damping coefficient of the target oil well:
in the formula, Delta is the comprehensive damping coefficient, epsilon is the friction load on the up-down stroke, L is the length of the sucker rod column, vmaxThe maximum motion speed of the suspension point, s the stroke of the pumping unit and n the stroke frequency of the pumping unit.
And comparing and analyzing the calculated comprehensive damping coefficient with the limit value determined by the oil field.
2. The identification method according to claim 1, wherein if the calculated comprehensive damping coefficient is greater than the limit value determined in the oil field, the oil is judged to be in a thick oil or wax deposition condition; otherwise, the well is judged to be in a normal working condition.
3. The identification method of claim 1, wherein the acquired oil well sucker rod column combination parameters include sucker rod number of stages, diameter and length; and reading the parameters of the depth and the diameter of the lower pump and the oil-gas-water density.
4. The identification method according to claim 1, wherein the friction load e applied to the up-down stroke is calculated by the formula:
ε＝Fu+Fd＝Pmax-Pmin-Wl-frLgρl-2Pv-2Fbg-phfp+pifp
in the formula: ε -the frictional load on the up and down stroke, N; fu、Fd-maximum friction load in up and down stroke, N; pmax、Pmin-maximum, minimum load of suspension point, N; w is a group ofl-a liquid column load, N, acting on the plunger; f. ofr-sucker rod cross-sectional area, m2(ii) a L-sucker rod column length, m; g-acceleration of gravity, m/s2；ρlDensity of pumped liquid, kg/m3；fpPlunger cross-sectional area, m2；ph-wellhead back pressure, Pa; p is a radical ofi-a pump inlet pressure, Pa; fbgSemi-dry friction, N, between the plunger and the barrel.
5. Identification method according to claim 4, characterized in that the vibration load PvThe calculation formula of (2) is as follows:
in the formula: pv-a vibration load, N; e-the elastic modulus of the sucker rod, Pa; a-the propagation velocity of the elastic wave in the sucker rod string, m/s;v-relative movement speed of the lower end of the sucker rod string to the suspension point at the end of the initial deformation period, m/s.
6. Identification method according to claim 4, characterised in that the half-dry friction F between the plunger and the cylinderbgThe calculation formula is as follows:
in the formula: fbgSemi-dry friction between plunger and pump barrel, N; d-the diameter of the plunger of the oil well pump is mm; delta-clearance on the radius of the plunger bushing pair, mm.
7. The identification method of claim 1, wherein the threshold value is determined based on-site oil thickening and wax precipitation well data calculations and statistical analysis.
8. The utility model provides a beam-pumping unit well oil is thick and wax deposition operating mode identification system which characterized in that includes:
the data acquisition module is used for acquiring the number of stages, the diameter and the length of the sucker rod of the target oil well; reading parameters of the depth and the diameter of the lower pump, parameters of oil gas and water density, parameters of the working fluid level, stroke frequency, wellhead back pressure, wellhead casing pressure and water content of a target oil well, and maximum load and minimum load of a suspension point of the current oil pumping unit;
a data processing module:
the half-dry friction force F between the plunger and the pump barrel was calculated using the following modelbg：
In the formula: fbgSemi-dry friction between the plunger and the cylinder, N; d-the diameter of the plunger of the oil well pump is mm; δ -clearance over plunger bushing pair radius, mm;
the vibration load P was calculated using the following modelv：
In the formula: pv-a vibration load, N; e-the elastic modulus of the sucker rod, Pa; a-the propagation velocity of the elastic wave in the sucker rod string, m/s; v-the relative movement speed of the lower end of the sucker rod string to the suspension point at the end of the initial deformation period, m/s;
calculating the friction load epsilon borne by the upper stroke and the lower stroke by using the following model:
ε＝Fu+Fd＝Pmax-Pmin-Wl-frLgρl-2Pv-2Fbg-phfp+pifp
in the formula: ε -the frictional load on the up and down stroke, N; fu、Fd-maximum friction load in up and down stroke, N; pmax、Pmin-suspension point maximum, minimum load, N; wl-a liquid column load, N, acting on the plunger; f. ofr-sucker rod cross-sectional area, m2(ii) a L-sucker rod column length, m; g-acceleration of gravity, m/s2；ρlDensity of the pumped liquid, kg/m3；fpPlunger cross-sectional area, m2；ph-wellhead back pressure, Pa; p is a radical ofi-a pump inlet pressure, Pa;
calculating the comprehensive damping coefficient of the target oil well by using the following model:
in the formula, Delta is the comprehensive damping coefficient, epsilon is the friction load on the up-down stroke, L is the length of the sucker rod column, vmaxIs the most suspended pointAnd the large movement speed is s, the stroke of the pumping unit is s, and the stroke frequency of the pumping unit is n.
Oil thickening and wax precipitation condition analysis module: comparing the calculated comprehensive damping coefficient with a limit value determined by the oil field, and judging the working condition of oil thickening or wax deposition if the calculated comprehensive damping coefficient is greater than the limit value determined by the oil field; otherwise, the well is judged to be in a normal working condition.
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