WO2015143626A1

WO2015143626A1 - Two-flow well test analysis method and system on basis of indicator diagram

Info

Publication number: WO2015143626A1
Application number: PCT/CN2014/074040
Authority: WO
Inventors: 辛宏; 朱天寿; 慕立俊; 曾亚勤; 黄伟; 甘庆明; 李明; 张磊; 杨海涛; 韩二涛; 李明江
Original assignee: 中国石油天然气股份有限公司
Priority date: 2014-03-25
Filing date: 2014-03-25
Publication date: 2015-10-01

Abstract

Disclosed are a two-flow well test analysis method and system on the basis of an indicator diagram. The method comprises: measuring a surface casing pressure and load and displacement of a sucker rod of an oil sucking machine, and collecting and acquiring a load and time curve and a displacement and time curve; generating a time-varying polished rod indicator diagram of a load capacity and the displacement of the sucker rod according to the load and time curve and the displacement and time curve; acquiring a pump diagram according to the polished rod indicator diagram; building a working fluid level calculation mathematical model according to the pump diagram, and acquiring working fluid level data of an oil well; acquiring, by means of calculation, flowing bottom hole pressure data according to the working fluid level data of the oil well and the surface casing pressure in a working system; adjusting a parameter of the working system, monitoring variations of the surface casing pressure in real time, acquiring, by means of calculation, variations of the flowing bottom hole pressure data, and generating, by means of fitting, a surface casing pressure variation curve and a flowing bottom hole pressure variation curve; and performing well test analysis according to the surface casing pressure variation curve and the flowing bottom hole pressure variation curve, and acquiring an analysis result.

Description

Method and system for two-flow well test analysis based on dynamometer diagram

The invention relates to the field of oil field test well, and is a method for real-time monitoring of bottomhole flow pressure data by using digital wellsite field test, collecting data and oil well basic data, realizing monitoring of bottomhole flow pressure data based on dynamometer diagram and method for obtaining formation parameters based on dynamometer system. Background technique

In the oil well production process, the oil well dynamic surface and bottom hole flow pressure are important data for oil well evaluation; the oil well dynamic surface data can directly reflect the liquid supply situation of the formation and the relationship between underground supply and discharge is the evaluation and optimization of the oil production process. The important basis is that the bottom hole flow pressure refers to the pressure at the bottom of the well during normal production, and it is one of the most important parameters determining the output of the well.

In the existing well test analysis technology, reliable oil well dynamic data can be obtained to ensure long-term high-yield and stable production of oil fields; pressure recovery test wells are commonly used, but in some oil and gas well production processes, such shut-in pressure measurement often encounters difficult. For example, in some ultra-high pressure gas wells, the wellhead pressure is very high, and the well pipe string and wellhead device are difficult to withstand such high pressure; some high waxy oil and gas wells are prone to occur when the formation parameters are recovered for the well parameters. Severe wax plugging phenomenon, after the test is completed, it is impossible to open well production. For low-permeability gas layers, it is often necessary to shut down the well for several weeks to obtain satisfactory pressure recovery data, which has a great impact on productivity; some oil wells are deformed due to wellbore Factors such as the pressure gauge can not be smoothly entered, affecting the test results. The main problems of the above methods are: The logging method has a long test period, and the pressure recovery is difficult, which affects the normal production of the oil well. Therefore, it is necessary to propose a method that does not affect the normal production of the oil well, and can obtain the formation parameters more efficiently, economically and accurately, and digitize the oil well. , Well-managed analysis method for well testing. Summary of the invention

In order to solve the above problems, the present invention proposes to make full use of the existing test and acquisition data, obtain the bottom hole flow pressure by using the oil well dynamic surface, and does not need to shut down the well pressure measurement, and only needs to change the working system to change the output and obtain an accurate formation. Parameters, for well test analysis.

In order to achieve the above object, the present invention provides a method for two-flow well test analysis based on a dynamometer diagram, the method comprising: measuring a wellhead casing pressure by a pressure gauge installed at a wellhead, by installing on a wellhead suspension rope Load sensor and displacement sensor under the beam of the pumping unit, measure the load and displacement of the sucker rod of the pumping unit, collect and acquire the load and time curve, and the displacement and time curve; according to the load and time curve, and a displacement and time curve, generating a light pole dynamometer of the load amount and displacement of the sucker rod as a function of time; To the pump work diagram; establish a mathematical model of the dynamic liquid surface calculation according to the pump work diagram, and obtain the oil well surface data; under a working system, obtain the bottom hole flow pressure data according to the oil well dynamic surface data and the wellhead casing pressure calculation Adjusting the parameters of the working system, monitoring the change of the wellhead casing pressure in real time, obtaining the change of the bottomhole flow pressure data by calculation, fitting the wellhead casing pressure variation curve and the bottomhole flow pressure variation curve; according to the wellhead The well test curve and the bottom-hole flow pressure change curve were analyzed for well test, and the analysis results were obtained.

In order to achieve the above object, the present invention also provides a system for two-flow well test analysis based on a dynamometer, the system comprising: a data acquisition device and a data processing device; wherein the data acquisition device is configured to be installed The pressure gauge at the wellhead measures the wellhead casing pressure, and measures the load and displacement of the sucker rod of the pumping unit through the load sensor installed on the wellhead suspension and the displacement sensor below the pumping beam, and collects and acquires the load. And a time curve, and a displacement and time curve; the data processing device includes: an oil well moving liquid surface acquisition module, a bottom hole flow pressure calculation module, a well test data processing module, a well test data analysis module; wherein, the oil well fluid a surface acquisition module, configured to generate a light pole indicator diagram of the load amount and displacement of the sucker rod according to the load and time curve, and the displacement and time curve; and obtain pump work according to the light pole work diagram Drawing a mathematical model for calculating the dynamic liquid surface according to the pump work diagram, obtaining oil well surface data; the bottom hole flow pressure The calculation module is configured to obtain bottom hole flow pressure data according to the oil well dynamic surface data and the wellhead casing pressure calculation under a working system; the well test data processing module is configured to adjust parameters of the working system, real-time monitoring The change of the wellhead casing pressure is obtained by calculating the change of the bottomhole flow pressure data, and fitting a wellhead casing pressure variation curve and a bottomhole flow pressure variation curve; the well testing data analysis module is configured according to the wellhead sleeve The well test analysis was carried out by the pressure change curve and the bottom hole flow pressure change curve, and the analysis results were obtained.

The method and system for the two-flow well test analysis based on the dynamometer of the present invention realizes the real-time calculation of the bottomhole flow pressure by using the dynamometer graph without breaking any collection instrument and equipment, and breaks the traditional method for shutting down the well. The second flow well test analysis method is applied to realize the accurate acquisition of the bottom hole parameters. The analytical results are milder than the measured and measured data, and the fitting parameters are reliable. It has guiding significance for the optimization and adjustment of the oil well working system, reducing the workload of the pressure measuring operation and reducing The impact of shut-in on production, solving the contradiction between obtaining formation parameters and oilfield production, reducing testers, reducing labor costs and production test costs, and meeting the needs of oilfield digital production management. DRAWINGS

The drawings described herein are provided to provide a further understanding of the invention, and are not intended to limit the invention. In the drawing:

1 is a flow chart of a method for two-flow well test analysis based on a power diagram according to an embodiment of the present invention.

2 is a schematic diagram of a system structure of a two-flow well test analysis based on a power diagram according to an embodiment of the present invention. 3A and 3B are schematic views showing the structure of a beam pumping unit according to an embodiment of the present invention.

4 is a schematic diagram of a power diagram of a light pole dynamometer transfer pump according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a double logarithmic fitting curve according to an embodiment of the present invention.

6 is a schematic diagram of a semi-logarithmic fitting curve according to an embodiment of the present invention.

7 is a schematic diagram of a pressure history fitting curve according to an embodiment of the present invention. detailed description

The technical means adopted by the present invention for achieving the intended purpose of the invention will be further clarified with reference to the drawings and preferred embodiments of the invention.

1 is a flow chart of a method for two-flow well test analysis based on a power diagram according to an embodiment of the present invention. As shown in Figure 1, the method includes:

Step S101, measuring the wellhead casing pressure by a pressure gauge installed at the wellhead, and measuring the load and displacement of the sucker rod of the pumping unit by a load sensor installed on the wellhead suspension rope and a displacement sensor below the pumping beam of the pumping unit , Collect and acquire load versus time curves, and displacement versus time curves.

Step S102, according to the load and time curve, and the displacement and time curve, generate a light rod indicator diagram of the load amount and displacement of the sucker rod as a function of time.

Step S103, obtaining a pump power map according to the polished light diagram.

Step S104, a mathematical model for calculating the dynamic liquid surface is established according to the pump work diagram, and the oil well surface data is obtained.

Step S105, obtaining a bottomhole flow pressure data according to the oil well surface data and the wellhead casing pressure calculation under a working system.

Step S106, adjusting the parameters of the working system, real-time monitoring the change of the wellhead casing pressure, obtaining the change of the bottomhole flow pressure data through calculation, fitting the wellhead casing pressure variation curve and the bottomhole flow pressure variation curve.

Step S107, performing well test analysis according to the wellhead casing pressure change curve and the bottom hole flow pressure change curve, and obtaining the analysis result.

Wherein, after measuring the wellhead casing pressure, collecting the load and time curve, and the displacement and time curve in step S101, the collected data is transmitted to the data acquisition device of the wellhead through the cable line, and then uploaded to the remote data terminal of the well site through the data acquisition device. Then, the collected data is uploaded to the data processing device of the primary station through the well group antenna.

In step S104, a mathematical model for calculating the dynamic liquid surface is established according to the pump power map, and obtaining the oil well surface data includes: using a sinking pressure as a node, establishing a balance model in which the fixed valve in the stroke and the floating valve act on the plunger The force is analyzed for the plunger to obtain the first sinking pressure, and then the first sinking pressure is compared with the second sinking pressure obtained by the oil jacket annulus pressure distribution, and the oil well moving surface data is obtained. In step S105, the formula for obtaining the bottomhole flow pressure data using the oil well dynamic surface data and the wellhead casing pressure calculation is as follows:

Among them, the oil column annular space liquid column density, kg / m3;

/ _w is water content; A is crude oil density, kg / m3;

^ is the water density, kg / m3; for the pump hanging depth, m;

P _e is the wellhead casing pressure, Mpa;

For oil well dynamic surface data, m _; is the bottom hole flow pressure data, Mpa.

In step S106, adjusting the parameters of the working system can obtain the well test data under different working systems by changing parameters such as stroke, stroke, pump diameter, pumping and the like when the pumping unit is working; wherein, the pumping and pumping paths need to be renewed. Starting from the column, the operation is more troublesome, and the stroke and stroke are easier to adjust. Therefore, changing the working system generally means changing the stroke and the stroke.

After obtaining the analysis result in step S107, the system network structure can be established, and the analysis result is released in units of the oil production plant.

Based on the same inventive concept, a two-flow well test analysis system based on the dynamometer is also provided in the embodiment of the present invention, as described in the following embodiments. Since the principle of solving the problem by the two-flow well testing analysis system based on the dynamometer is similar to the two-flow well testing analysis method based on the dynamometer, the implementation of the two-flow well testing analysis system based on the dynamometer can be referred to the aforementioned well testing analysis. The implementation of the method, the repetition will not be repeated. As used hereinafter, the term "unit" or "module" may implement a combination of software and/or hardware for a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and conceivable.

2 is a schematic diagram of a system structure of a two-flow well test analysis based on a dynamometer diagram according to an embodiment of the present invention. The structure will be specifically described below. As shown in FIG. 2, the system includes: a data acquisition device 1 and a data processing device 2;

The data collecting device 1 is configured to measure the wellhead casing pressure by a pressure gauge installed at the wellhead, and is installed by hanging at the wellhead The load sensor on the rope and the displacement sensor under the beam of the pumping unit measure the load and displacement of the sucker rod of the pumping unit, collect and acquire the load and time curve, and the displacement and time curve;

The data processing device 2 includes: an oil well dynamic liquid surface acquisition module 21, a bottom hole flow pressure calculation module 22, a well test data processing module 23, and a well test data analysis module 24;

The oil well moving liquid surface obtaining module 21 is configured to generate a light rod indicator diagram of the load amount and the displacement of the sucker rod according to the load and time curve, and the displacement and time curve; and obtain a pump power map according to the light rod indicator diagram; According to the pump work diagram, the mathematical model of the dynamic liquid surface is calculated, and the oil well surface data is obtained;

The bottom hole flow pressure calculation module 22 is configured to obtain bottom hole flow pressure data according to the oil well dynamic surface data and the wellhead casing pressure calculation under a working system;

The well test data processing module 23 is configured to adjust the parameters of the working system, monitor the change of the wellhead casing pressure in real time, obtain the change of the bottomhole flow pressure data through calculation, and fit to generate the wellhead casing pressure variation curve and the bottomhole flow pressure variation curve;

The well test data analysis module 24 is configured to perform well test analysis according to the wellhead casing pressure change curve and the bottom hole flow pressure change curve, and obtain the analysis result.

In this embodiment, after measuring the wellhead casing pressure, collecting the load and time curve, and the displacement and time curve, the data acquisition device 1 transmits the collected data to the data acquisition device 1 of the wellhead through the cable line, and then passes through the data acquisition device 1 The remote data terminal (RTU) uploaded to the well site transmits the collected data to the data processing device 2 of the primary station through the well group antenna.

In this embodiment, the oil well moving surface acquisition module 21 establishes a mathematical model for calculating the dynamic liquid surface according to the pump work diagram, and obtaining the oil well dynamic surface data includes:

Using the sinking pressure as a node, establish a balance model in which the fixed valve in the stroke and the floating valve act on the plunger to perform force analysis on the plunger to obtain the first sinking pressure, and then the first sinking pressure and the oil jacket The second sinking pressure obtained by the annulus pressure distribution is compared to obtain the oil well surface data.

In the present embodiment, the formula for calculating the bottomhole flow pressure data by the bottom hole flow pressure calculation module 22 is as follows:

Among them, A is the liquid column density of the oil jacket annular space, kg/m3;

/ _w is the moisture content;

A is the density of crude oil, kg/m3; ^ is the water density, kg / m3; for the pump hanging depth, m; for the wellhead casing pressure, Mpa;

For the oil well surface data, m _; R _D is the bottom hole flow pressure data, Mpa.

In this embodiment, the parameters of the test data processing module 23 to adjust the working system include: changing the stroke, stroke, pump diameter, and pumping of the pumping unit.

In this embodiment, the system further includes: a result issuing device, configured to establish a system network structure after obtaining the analysis result, and release the analysis result in units of the oil production plant.

The technical effects of the method and system for well test analysis of the present invention will be described below with reference to Figs. 3A, 3B and 4 to 7.

As shown in FIG. 3A, the beam pumping unit in the well field mainly comprises: a power mechanism 31, a bracket 32, a beam center shaft 33, a beam 34, a hammer 35, a crankshaft link 36, and a sucker rod 37. , the suspension cable 38 and the electric control box 39; wherein the beam 34 is mounted on the bracket 32 through the beam center shaft 33, the hammer 35 is mounted on the beam 34 end, and the other end of the beam 34 is connected by the crank link 36. To the power mechanism 31, the sucker rod 37 is connected to the hammer 35, and the suspension rod 38 is disposed on the sucker rod 37, and the electric control box 39 is used to control the power of the entire pumping unit.

As shown in FIG. 3B, the pumping unit is further provided with a displacement sensor 41, a load sensor 42, a pressure gauge 43 and a data acquisition device 44; the displacement sensor 41 is disposed below the beam 34, and the load sensor 42 is disposed on the suspension cable 38. The pressure gauge 43 is disposed at the wellhead, and the data collection device 44 is disposed between the brackets 32 of the pumping well.

In this embodiment, when the pumping unit is operated in an operating state, the power mechanism 31 drives the beam 34 and the hoe.

35 swings up and down, the hoe 35 drives the sucker rod 37 up and down, and the sucker rod 37 drives the plunger of the downhole pump to move up and down, thereby extracting the crude oil in the well. The displacement sensor 41 and the load sensor 42 are used to measure the displacement and load of the pumping rod 37; the pressure gauge 43 is used to measure the real-time casing pressure value of the oil well; the data acquisition device 44 collects the above data and sends it to the well. For the remote data terminal of the field, the remote data terminal uploads the logging data to the main station computer through the well group antenna.

In this embodiment, the displacement sensor 41 is composed of a magnetic steel and a Hall probe, and is respectively installed at a corresponding position of the pumping beam 34 and the bracket 32. When the pumping beam 34 moves up and down, the magnetic steel and the Huo The distance between the probes changes, the strength of the signal collected by the Hall probe occurs, and the signal is collected by the data acquisition device 44 and uploaded to the remote data terminal. Among them, the displacement sensor has a range of 0~5m and an accuracy of 0.5%. In this embodiment, the load cell has a range of 0 to 150 kN and an accuracy of 0.5%.

Specific application steps using the above device include:

1, collecting data:

The displacement sensor 41 measures the displacement of the sucker rod of the pumping unit, the load sensor 42 measures the load amount of the sucker rod of the pumping unit, and the pressure gauge 43 measures the real-time casing pressure value of the oil well, and respectively measures the respective values through the cable line. The displacement, load and casing values are transmitted as electrical signals to a data acquisition device 44 on a respective pumping unit.

2, transfer data:

The data acquisition device 44 can upload the collected load amount, displacement and casing pressure value to the remote data terminal of the well site, and the remote data terminal of the well site uploads the collected data to the main station computer of the primary station through the well group antenna.

3. Monitor oil well data by collecting data:

The main station computer monitors and displays the oil well data in real time, such as pump work diagram, oil well dynamic surface, bottom hole flow pressure, and second flow well test analysis results.

4, release the calculation results:

After the result distribution device set in each well site receives the well data and results sent from the main station computer, all the data is stored and the web page information is released in the well site.

In the present embodiment, Fig. 4 is a schematic view showing the work diagram of the light pole dynamometer transfer pump according to an embodiment of the present invention. As shown in Fig. 4, the master station computer uses the variation of the load and displacement of the sucker rod 37 to obtain the polished rod diagram. Then, through the establishment of the sucker rod 37, the tubing finite element model and the liquid column difference calculation model, the load diagram of the pumping port of the deep well, the load of the sucker rod and the displacement versus time are solved iteratively, that is, the pump power diagram is obtained.

In the present embodiment, the mathematical model of the moving liquid surface is established by the pump power diagram, and the sinking pressure is used as a node to establish a balance model in which the fixed valve in the stroke and the floating valve act on the plunger. The sinking pressure corresponding to the pumping degree is compared with the suction pressure of the pump during the upper stroke, and then compared with the sinking pressure obtained by the oil ring annulus pressure distribution, and the oil well surface data is estimated. Then, a mathematical model of the bottom hole flow pressure is established, and the bottom hole flow pressure is calculated according to the real-time calculation of the oil well dynamic surface and the wellhead casing pressure.

In this embodiment, a light rod dynamometer map is acquired every 10 minutes, corresponding to solving a well hydraulic surface and bottom hole flow pressure. Collecting 144 dynamometers a day can solve 144 downhole flow pressures. According to the well testing method described in Figure 1, by changing the working principle of the oil well, such as adjusting the stroke, stroke, etc., continuously monitoring the oil-liquid surface and casing pressure change data before and after the adjustment, and using the vertical pipe flow for liquid level conversion and two-flow The well test analysis method is combined with the "change well storage + skin + homogeneous infinite reservoir model" for fitting analysis, and the reservoir pressure coefficient, effective permeability, and skin factor of the near well zone are obtained. Through the aforementioned devices and steps, make full use of the test and acquisition data, obtain the polished rod diagram and obtain the downhole pump diagram, combined with the two-flow well analysis method, only need to change the working system without the need for shut-in pressure measurement. By changing the output, the formation parameters can be obtained efficiently, economically and accurately, and the optimization and adjustment of the working system of the well can be guided, and the digitalization and intelligent management of the oil well can be further extended to the digital management of the reservoir.

In order to explain the method and system of the above-mentioned dynamometer-based two-flow well test analysis, a specific embodiment will be described below, but it is worth noting that the embodiment is only for better explanation. The present invention is not intended to unduly limit the invention.

In this embodiment, the two flow test wells are based on the principle of seepage mechanics. When the working system of a production well changes, an unstable seepage process is formed in the bottom of the well and the strata involved in the formation fluid flow, at any point. The pressure change process reflects the properties of the formation and fluid and the boundary conditions of the well. This is the theoretical basis for determining the parameters of the formation and pumping well by using the variable flow test curve of the working parameters of the well.

For example, an oil well on May 16, 2012 in the working system is pump diameter Φ 32 (mm) stroke 2. 5 (m) X punch times 3. 8 (min ¹ ) X pump hanging 813. 74 (m) stable Production for 10 days, monitoring casing pressure, bottom hole pressure data, and then changing the working system to pump diameter Φ 32 (mm) X stroke 2. 5 (m) X punching 2. 3 (min ¹ ) X pump hanging 813.74 (m) Stable production for 10 days, monitoring casing pressure, bottom hole pressure, casing pressure test through the wellhead pressure test chart and remote transmission to the main station computer, the bottom hole pressure is calculated by the collected dynamometer data, as shown in Table 1 below. acquisition time corresponding set pressure and the bottomhole pressure value; by data gatherer 20 days, well test data is loaded into the software saphir3.2 or p anS _ystem3.4, obtained in FIG. 5, FIG. 6, FIG. 7 The analytical curve, and Table 2 explain the parameter table.

Table 1 bottom hole pressure bottom pressure bottom pressure time nesting time nesting time nesting pressure

Force

(min) (MPa) (MPa) (min) (MPa) (MPa) (min) (MPa) (MPa)

0 1.380 5.721 75 1.402 5.744 150 1.399 5.744

3 1.380 5.721 77 1.399 5.744 152 1.399 5.744

6 1.380 5.721 81 1.399 5.744 155 1.402 5.744

9 1.380 5.721 83 1.399 5.744 159 1.406 5.751

12 1.380 5.721 87 1.399 5.744 162 1.406 5.751

15 1.384 5.728 90 1.395 5.744 165 1.406 5.751

18 1.384 5.728 92 1.391 5.735 167 1.406 5.751

20 1.380 5.728 96 1.391 5.735 170 1.406 5.751

24 1.384 5.728 98 1.391 5.735 174 1.406 5.751

26 1.388 5.728 102 1.391 5.735 177 1.406 5.751

30 1.388 5.728 105 1.391 5.735 180 1.410 5.751 33 1.391 5.735 107 1.391 5.735 182 1.410 5.751

36 1.391 5.735 111 1.388 5.735 185 1.410 5.751

38 1.395 5.735 113 1.388 5.735 189 1.410 5.751

41 1.395 5.735 117 1.388 5.735 192 1.410 5.751

45 1.399 5.744 120 1.388 5.735 195 1.410 5.751

48 1.399 5.744 122 1.388 5.735 197 1.410 5.751

51 1.399 5.744 125 1.388 5.735 200 1.410 5.751

53 1.399 5.744 129 1.388 5.735 204 1.410 5.751

56 1.399 5.744 132 1.391 5.735 207 1.410 5.751

60 1.399 5.744 135 1.391 5.735 210 1.410 5.751

62 1.399 5.744 137 1.391 5.735

66 1.402 5.744 140 1.391 5.735

68 1.399 5.744 144 1.395 5.735 8942 1.768 6.055

72 1.399 5.744 147 1.395 5.735 Combined with the curve analysis in Fig. 5 to Fig. 7, it can be seen that the well has the characteristics of variable well storage in the early stage. After the well storage effect ends, the pressure and the derivative line rise upward, and the later derivative is large, the well test analysis The curve generally shows the characteristics of the fracture reservoir.

Using vertical pipe flow for liquid level conversion and two-flow well test analysis method, combined with "well storage + variable skin + finite conductivity + homogeneous infinite reservoir model" for fitting analysis is shown in Figure 5; interpretation results are tested and measured The curves are more consistent, indicating that the fitting parameters are reliable.

Combined with Table 2, the comprehensive analysis of the test results shows that the pressure coefficient is 0.92, which belongs to the atmospheric reservoir. The effective permeability of the fitting result is 2.019 Χ 10· ³ μιη ² , indicating that it is a low permeability reservoir. The skin factor of the near well zone is 0.06, indicating a slight pollution in the near-well zone.

Table 2 Parameter name Parameter value Township formation coefficient 8.076 10" m ² .m Effective permeability 2.019 10" ³ μηι ² Wellbore storage coefficient 8.286 m ³ /MPa

Skin factor 0.06 ―

Flow pressure 5.721 MPa

Formation pressure 12.258 MPa

Production pressure difference 6.537 MPa Liquid production index 1.068 m ^{3 / (} d.MPa)

The pressure coefficient is 0.92. By the method and system for the two-flow well test analysis based on the dynamometer diagram of the present invention, real-time calculation of the bottomhole flow pressure by using the dynamometer is realized without adding any acquisition instrument equipment, breaking the traditional Closed well pressure measurement method, using two-flow well test analysis method to achieve accurate acquisition of bottom hole parameters, the analytical results are mild and the measured data is gentle, the fitting parameters are reliable, which is of guiding significance for the optimization and adjustment of the oil well working system, reducing the pressure measurement The workload of the operation, reducing the impact of shut-in on production, solving the contradiction between obtaining formation parameters and oilfield production, reducing testers, reducing labor costs and production test costs, and meeting the needs of oilfield digital production management.

The above described specific embodiments of the present invention are further described in detail, and are intended to be illustrative of the embodiments of the present invention. The scope of the protection, any modifications, equivalents, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

claims

1. A method of two-flow well test analysis based on dynamometer diagram, characterized in that the method includes: measuring the wellhead casing pressure through a pressure gauge installed at the wellhead, and measuring the wellhead casing pressure through a load sensor installed on the wellhead rope suspension and The displacement sensor under the beam of the pumping unit measures the load and displacement of the pumping rod, collects and obtains the load versus time curve, and the displacement versus time curve;

According to the load vs. time curve and the displacement vs. time curve, generate a polished rod dynamometer diagram of the load amount and displacement of the sucker rod changing with time;

Obtain the pump power diagram according to the polished rod power indicator diagram;

Establish a mathematical model for dynamic liquid level calculation based on the pump power diagram to obtain oil well dynamic liquid level data;

Under a working system, obtain bottom hole flow pressure data based on the oil well dynamic fluid level data and wellhead casing pressure calculations; adjust the parameters of the working system, monitor changes in the wellhead casing pressure in real time, and obtain the bottom hole flow pressure through calculation Changes in pressure data are fitted to generate wellhead casing pressure change curves and bottomhole flow pressure change curves;

Conduct well test analysis based on the wellhead casing pressure change curve and bottomhole flow pressure change curve to obtain analysis results.

2. The method according to claim 1, characterized in that, the wellhead casing pressure is measured through a pressure gauge installed at the wellhead, through a load sensor installed on the wellhead rope hanger and a displacement sensor below the beam of the pumping unit. , measure the load and displacement of the sucker rod of the pumping unit, collect and obtain the load vs. time curve, and the displacement vs. time curve, including:

After measuring the wellhead casing pressure, collecting the load vs. time curve, and the displacement vs. time curve, the collected data is transmitted to the data acquisition device at the wellhead through the cable line, and then uploaded to the remote data terminal at the well site through the data acquisition device, and then The collected data is uploaded to the data processing device of the main station through the well group antenna.

3. The method of claim 1, wherein establishing a mathematical model for calculating dynamic liquid level based on the pump power diagram and obtaining oil well dynamic liquid level data includes:

Taking the sinking pressure as a node, establish a balance model in which the fixed valve and the traveling valve opening in the stroke act on the plunger, so as to perform a force analysis on the plunger to obtain the first sinking pressure, and then compare the first sinking pressure with the The second submergence pressure obtained from the oil casing annulus pressure distribution is compared to obtain the oil well dynamic fluid level data.

4. The method according to claim 3, characterized in that, the formula for obtaining bottom hole flow pressure data using the oil well dynamic liquid level data and wellhead casing pressure calculation is as follows:

Among them, is the liquid column density in the annular space of the oil jacket, kg/m3; / _w is the water content; A is the density of crude oil, kg/m3;

^ is the water density, kg/m3; is the vertical depth of the pump, m; is the wellhead casing pressure, Mpa;

is the oil well fluid level data, m _; is the bottom well flow pressure data, Mpa.

5. The method according to claim 1, characterized in that adjusting the parameters of the working system includes: changing the number of strokes, stroke, pump diameter and pump hanger when the pumping unit is working.

6. The method according to claim 1, characterized in that, after performing well test analysis according to the wellhead casing pressure change curve and the bottom hole flow pressure change curve and obtaining the analysis results, the method further includes:

Establish a system network structure and publish the analysis results on an oil production plant basis.

7. A system for two-flow well test analysis based on dynamometer diagram, characterized in that the system includes: a data acquisition device and a data processing device; wherein,

The data acquisition device is used to measure the wellhead casing pressure through a pressure gauge installed at the wellhead, and to measure the sucker rod of the pumping unit through a load sensor installed on the wellhead rope suspension and a displacement sensor under the beam of the pumping unit. Load and displacement, collect and obtain load and time curves, and displacement and time curves;

The data processing device includes: an oil well fluid level acquisition module, a bottom hole flow pressure calculation module, a well test data processing module, and a well test data analysis module; wherein,

The oil well dynamic liquid level acquisition module is used to generate a polished rod dynamometer diagram of the load and displacement of the sucker rod changing with time according to the load and time curve and the displacement and time curve; according to the polished rod display The work diagram is used to obtain a pump work diagram; a mathematical model for dynamic liquid level calculation is established based on the pump work map to obtain oil well dynamic fluid level data; the bottom well flow pressure calculation module is used to calculate the oil well dynamic fluid level according to the oil well dynamic fluid level under a working system Surface data and wellhead casing pressure calculation are used to obtain bottomhole flow pressure data;

The well test data processing module is used to adjust parameters of the working system, monitor changes in the wellhead casing pressure in real time, obtain changes in the bottom hole flow pressure data through calculation, and fit and generate wellhead casing pressure change curves and well data. Bottom flow pressure change curve;

The well test data analysis module is used to analyze data according to the wellhead casing pressure change curve and the bottomhole flow pressure change curve. Conduct well test analysis and obtain analysis results.

8. The system according to claim 7, characterized in that the data acquisition device is used to measure the wellhead casing pressure through a pressure gauge installed at the wellhead, through a load sensor installed on the wellhead rope suspension and the pumping unit. The displacement sensor under the beam measures the load and displacement of the pumping rod, collects and obtains the load versus time curve, and the displacement versus time curve also includes:

The collected data is transmitted to the data collection device at the wellhead through the cable, and then uploaded to the remote data terminal at the well site through the data collection device, and then the collected data is uploaded to the data processing device of the main station through the well group antenna.

9. The system according to claim 7, characterized in that the oil well dynamic fluid level acquisition module is used to establish a dynamic fluid level calculation mathematical model based on the pump power diagram. Obtaining the oil well dynamic fluid level data includes:

10. The system according to claim 9, characterized in that the formula used by the bottomhole flow pressure calculation module to calculate and obtain bottomhole flow pressure data is as follows:

Among them, A is the liquid column density in the annular space of the oil jacket, kg/m3; / _w is the water content;

A is the density of crude oil, kg/m3;

7 _w is the water density, kg/m3; is the vertical depth of the pump, m; is the wellhead casing pressure, Mpa;

11. The system according to claim 7, characterized in that the well test data processing module adjusts the parameters of the working system including: changing the number of strokes, strokes, pump diameters and pump hangers when the pumping unit is working.

12. The system according to claim 7, characterized in that the system further includes: a result publishing device, used to perform well testing analysis based on the wellhead casing pressure change curve and the bottomhole flow pressure change curve to obtain analysis results. Establish a system network structure and publish the analysis results based on the oil production plant.