Method and system for calculating diameter of oil nozzle with adjustable opening degree

Abstract

The invention relates to a method and a system for calculating the diameter of an opening-adjustable oil nozzle. The calculation method comprises the following steps: defining a flow factor and obtaining a flow factor definition formula according to a flow formula of a gas well based on yield, an oil nozzle and oil pressure; according to the gas well data of the fixed oil nozzle and a flow factor definition formula, obtaining an adjustable opening oil nozzle diameter calculation formula based on yield and oil pressure; and the diameter of the adjustable-opening oil nozzle is obtained through calculation according to the adjustable-opening oil nozzle diameter calculation formula based on the yield and the oil pressure and the yield and oil pressure data of the gas well. The flow factor concept is introduced, the relation formula of the flow factor and the oil pressure is moved according to the output and oil pressure data of the fixed oil nozzle, finally, the diameter calculation formula of the adjustable-opening oil nozzle based on the output and the oil pressure is obtained, and the diameter of the adjustable-opening oil nozzle calculated through the output and the oil pressure of a gas outlet well is achieved.

Description

Technical Field

[0001] The invention belongs to the field of oil reservoir development, and in particular relates to a method and a system for calculating the diameter of an adjustable-opening oil nozzle. Background Art

[0002] With the increasing progress of petroleum equipment manufacturing technology, the original fixed nozzles are gradually replaced by adjustable nozzles. The nozzle size is an important parameter for gas reservoir development, but the diameter of the nozzle cannot be determined for the adjustable nozzle. The lack of nozzle size brings a certain degree of trouble to the scientific management of oil and gas reservoirs, such as the inability to adjust the production in time according to the relationship between the nozzle and the oil pressure. Therefore, a method and system for calculating the diameter of an adjustable nozzle is urgently needed for the scientific management of oil and gas reservoirs. Summary of the invention

[0003] In view of the above problems, the present invention provides a method and system for calculating the diameter of an adjustable oil nozzle.

[0004] One object of the present invention can be achieved by the following technical solutions:

[0005] A method for calculating the diameter of an adjustable opening oil nozzle, comprising:

[0006] According to the flow formula of the gas well based on production, oil nozzle and oil pressure, define the flow factor and obtain the flow factor definition formula;

[0007] According to the gas well data of fixed nozzle and the flow factor definition formula, the calculation formula of the diameter of the adjustable nozzle based on production and oil pressure is obtained;

[0008] The diameter of the adjustable opening nozzle is calculated based on the calculation formula of the diameter of the adjustable opening nozzle based on the production and oil pressure and the production and oil pressure data of the gas well.

[0009] Furthermore, the flow formula of the gas well based on production, oil nozzle and oil pressure is obtained based on the flow formula, area formula and Bernoulli equation of the gas well.

[0010] Furthermore, the flow rate formula of the gas well based on production, oil nozzle and oil pressure is as follows:

[0011]

[0012] Where Q is the gas well production, μ is the flow coefficient, D is the nozzle diameter, P is the oil pressure, and ρ is the natural gas density.

[0013] Furthermore, the flow factor calculation formula is as follows:

[0014]

[0015] Where K is the flow factor.

[0016] Furthermore, the formula for calculating the diameter of the adjustable opening nozzle based on the production and oil pressure is obtained by defining the formula according to the gas well data and flow factor of the fixed nozzle, including:

[0017] According to the flow formula of the gas well based on the production, oil nozzle and oil pressure and the flow factor definition formula, a flow factor calculation formula based on the production, oil nozzle and oil pressure is obtained;

[0018] According to the gas well data of fixed nozzle and the flow factor calculation formula based on production, nozzle and oil pressure, the relationship formula between flow factor and oil pressure is obtained;

[0019] According to the flow factor calculation formula and the relationship formula between the flow factor and the oil pressure, the calculation formula for the diameter of the adjustable opening oil nozzle based on the output and the oil pressure is obtained.

[0020] Furthermore, the relationship between the flow factor and the oil pressure is as follows:

[0021] K=223.37*P 0.3777 .

[0022] Furthermore, the calculation formula of the diameter of the adjustable opening oil nozzle based on flow rate and oil pressure is as follows:

[0023]

[0024] Another object of the present invention can be achieved by the following technical solutions:

[0025] A system for calculating the diameter of an adjustable opening oil nozzle, comprising: a flow factor definition module, an adjustable opening oil nozzle diameter calculation formula acquisition module and an adjustable opening oil nozzle diameter calculation module;

[0026] The flow factor definition module is used to define the flow factor and obtain the flow factor definition formula according to the flow formula of the gas well based on the production, oil nozzle and oil pressure;

[0027] The adjustable opening nozzle diameter calculation formula acquisition module is used to define a formula according to the gas well data and flow factor of the fixed nozzle, and obtain the adjustable opening nozzle diameter calculation formula based on production and oil pressure;

[0028] The adjustable opening nozzle diameter calculation module is used to calculate the adjustable opening nozzle diameter according to the adjustable opening nozzle diameter calculation formula based on production and oil pressure and the production and oil pressure data of the gas well.

[0029] Furthermore, the module for obtaining the calculation formula of the adjustable opening nozzle diameter includes a submodule for obtaining the flow factor calculation formula based on the output, the nozzle and the oil pressure, a submodule for obtaining the relationship formula between the flow factor and the oil pressure and a formula transformation submodule.

[0030] Further, the flow factor calculation formula acquisition submodule based on production, oil nozzle and oil pressure is used to obtain the flow factor calculation formula based on production, oil nozzle and oil pressure according to the flow formula of the gas well based on production, oil nozzle and oil pressure and the flow factor definition formula;

[0031] The flow factor and oil pressure relationship formula acquisition submodule is used to obtain the flow factor and oil pressure relationship formula according to the gas well data of the fixed oil nozzle and the flow factor definition formula;

[0032] The formula conversion submodule is used to obtain a calculation formula for the diameter of the adjustable opening oil nozzle based on the output and the oil pressure according to the flow factor calculation formula and the relationship formula between the flow factor and the oil pressure.

[0033] Beneficial effects of the present invention:

[0034] The present invention introduces the concept of flow factor and obtains the relationship formula between flow factor and oil pressure based on the fixed nozzle production and oil pressure data, and finally obtains the calculation formula of adjustable nozzle diameter based on production and oil pressure, thereby realizing the calculation of adjustable nozzle diameter by production and oil pressure of gas well; and the error between the adjustable nozzle diameter and the actual nozzle is less than 10%; and the calculated adjustable nozzle diameter can give early warning of production anomalies (such as formation water production) and timely discover abnormal wells, thereby facilitating reservoir management.

[0035] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A flow chart of a method for calculating the diameter of an adjustable-opening oil nozzle according to an embodiment of the present invention is shown;

[0038] Figure 2 A simulation curve diagram of oil pressure and K value according to an embodiment of the present invention is shown;

[0039] Figure 3 A comparison diagram of the calculated oil nozzle and the actual oil nozzle in the Tarim region according to an embodiment of the present invention is shown;

[0040] Figure 4 A curve diagram of the diameter of an adjustable nozzle opening calculated for a gas well A between 2014 and 2019 according to an embodiment of the present invention is shown;

[0041] Figure 5 A curve chart showing oil pressure and production of a gas well A from 2014 to 2019 according to an embodiment of the present invention is shown;

[0042] Figure 6 A curve diagram of the diameter of an adjustable nozzle opening of a gas well B between 2013 and 2017 is shown according to an embodiment of the present invention;

[0043] Figure 7 A curve chart showing the oil pressure and production of a gas well B during 2013-2017 according to an embodiment of the present invention is shown;

[0044] Figure 8 A framework diagram of a system for calculating the diameter of an adjustable-opening oil nozzle according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] like Figure 1 As shown, a method for calculating the diameter of an adjustable opening oil nozzle according to an embodiment of the present invention includes:

[0047] According to the flow formula of the gas well based on production, oil nozzle and oil pressure, define the flow factor and obtain the flow factor definition formula;

[0048] According to the gas well data of fixed nozzle and the flow factor definition formula, the calculation formula of the diameter of the adjustable nozzle based on production and oil pressure is obtained;

[0049] The diameter of the adjustable opening nozzle is calculated based on the calculation formula of the diameter of the adjustable opening nozzle based on the production and oil pressure and the production and oil pressure data of the gas well.

[0050] In the embodiment of the present invention, the flow formula of the gas well based on production, oil nozzle and oil pressure is obtained based on the flow formula, area formula and Bernoulli equation of the gas well. The specific derivation process is as follows:

[0051] The flow rate formula of the gas well is shown in formula (1):

[0052] Q = Sv (1);

[0053] Among them, Q is the production of the gas well, S is the cross-sectional area of ​​the nozzle, and v is the oil flow rate.

[0054] The area formula is shown in formula (2):

[0055]

[0056] Where D is the diameter of the nozzle and S is the cross-sectional area of ​​the nozzle.

[0057] The Bernoulli equation is shown in formula (3):

[0058]

[0059] Where P is the natural gas pressure, ρ is the natural gas density, and V is the natural gas volume.

[0060] The flow rate formula of the gas well is derived according to formulas (1), (2) and (3), and the flow rate formula of the gas well based on production, oil nozzle and oil pressure is obtained, as shown in formula (4):

[0061]

[0062] Among them, μ is the flow coefficient, which is related to the friction resistance of the oil nozzle and oil pipe.

[0063] The flow factor is defined and the flow factor definition formula is obtained according to the flow formula of the gas well based on production, oil nozzle and oil pressure. The specific operation is as follows:

[0064] After integrating all parameters except oil pressure and nozzle diameter in formula (4), a new coefficient is obtained, and the coefficient is defined as flow factor K, that is, the flow factor definition formula is obtained, as shown in formula (5):

[0065]

[0066] The formula for defining the diameter of the adjustable nozzle opening based on the gas well data and flow factor of the fixed nozzle is obtained, including:

[0067] According to the flow formula of the gas well based on the production, oil nozzle and oil pressure and the flow factor definition formula, a flow factor calculation formula based on the production, oil nozzle and oil pressure is obtained;

[0068] According to the gas well data of fixed nozzle and the flow factor calculation formula based on production, nozzle and oil pressure, the relationship formula between flow factor and oil pressure is obtained;

[0069] According to the flow factor calculation formula and the relationship formula between the flow factor and the oil pressure, the calculation formula for the diameter of the adjustable opening oil nozzle based on the output and the oil pressure is obtained.

[0070] Specifically, the flow factor calculation formula based on production, oil nozzle and oil pressure is obtained according to the flow formula of the gas well based on production, oil nozzle and oil pressure and the flow factor definition formula, and the operation is as follows:

[0071] First, according to formulas (4) and (5), the flow factor calculation formula based on production, nozzle and oil pressure is obtained, as shown in formula (6):

[0072]

[0073] According to the gas well data of the fixed nozzle and the flow factor calculation formula based on production, nozzle and oil pressure, the relationship formula between the flow factor and the oil pressure is obtained, which is as follows:

[0074] According to the gas well data with fixed nozzles, that is, according to the known production Q, oil pressure P and nozzle D data, the K value can be obtained by substituting it into formula (8). The oil pressure and K value are fitted to obtain the empirical formula shown in (7):

[0075] K=223.37*P 0.3777 (7);

[0076] In this embodiment, the specific oil pressure and K value simulation curve is as follows: Figure 2 shown.

[0077] The calculation formula of the flow factor and the relationship formula between the flow factor and the oil pressure are transformed to obtain the calculation formula of the diameter of the adjustable opening oil nozzle based on the output and the oil pressure, which is specifically as follows:

[0078] Based on the derivation of formula (6) and formula (7), the calculation formula of the adjustable opening nozzle diameter based on production and oil pressure is obtained, as shown in formula (8):

[0079]

[0080] According to the calculation formula of the adjustable opening nozzle diameter based on production and oil pressure and the production and oil pressure data of the gas well, the diameter of the adjustable opening nozzle is calculated. That is, the production and oil pressure data of the new gas well are substituted into formula (8) to obtain the diameter of the adjustable opening nozzle.

[0081] In some embodiments of the present invention, the calculation of the fixed nozzle diameter is applied and compared with the actual nozzle. Figure 3 As shown, from Figure 2 It can be seen from the relationship in that the error between the calculated nozzle diameter and the actual nozzle diameter is less than 10%, indicating that the formula (8) obtained in this embodiment has good reliability in calculating the nozzle diameter.

[0082] In some embodiments of the present invention, formula (8) is used to calculate the diameter of the adjustable opening nozzle. The Keshen XX well (A gas well) has been put into production since 2014 and has been in stable production for 6 years. In the early stage, fixed nozzles were used, and in the later stage, adjustable opening nozzles were used. The nozzle curve calculated by formula (8) is shown as follows: Figure 4 As shown in the figure, at the same time, the oil pressure and production of the gas well are shown in Figure 5 As shown;

[0083] from Figure 4 and Figure 5 It can be seen that when the fixed nozzle is used in the early stage, the calculated value and the actual value are basically consistent. After the adjustable nozzle is used in the later stage, the actual nozzle value gradually increases, and the daily output is also increasing. This shows that the change trend of the adjustable nozzle parameters can provide early warning and decision-making for gas reservoir engineers.

[0084] In some embodiments of the present invention, formula (8) is used to calculate the diameter of the adjustable opening nozzle. The Keshen X well (B gas well) has been put into production since 2013 and has been in stable production for 2 years. The nozzle curve is calculated using this formula as shown in FIG. Figure 6 As shown in the figure, at the same time, the oil pressure and production of the gas well are shown in Figure 7 As shown;

[0085] from Figure 6 and Figure 7 It can be seen that the calculated value and the actual value are basically consistent. After water came out of the formation in 2015, the calculated oil nozzle had a large deviation from the actual oil nozzle, indicating the occurrence of abnormal conditions. For wells with fixed oil nozzles, abnormal wells can be predicted by comparing the calculated oil nozzle with the actual oil nozzle.

[0086] like Figure 8 As shown, in some other embodiments of the present invention, a system for calculating the diameter of an adjustable opening oil nozzle is provided, comprising: a flow factor definition module, an adjustable opening oil nozzle diameter calculation formula acquisition module and an adjustable opening oil nozzle diameter calculation module;

[0087] The flow factor definition module is used to define the flow factor and obtain the flow factor definition formula according to the flow formula of the gas well based on the production, oil nozzle and oil pressure;

[0088] The adjustable opening nozzle diameter calculation formula acquisition module is used to define a formula according to the gas well data and flow factor of the fixed nozzle, and obtain the adjustable opening nozzle diameter calculation formula based on production and oil pressure;

[0089] The adjustable opening nozzle diameter calculation module is used to calculate the adjustable opening nozzle diameter according to the adjustable opening nozzle diameter calculation formula based on production and oil pressure and the production and oil pressure data of the gas well.

[0090] In an embodiment of the present invention, the calculation formula acquisition module for the diameter of the adjustable opening oil nozzle includes a flow factor calculation formula acquisition submodule based on the output, the oil nozzle and the oil pressure, a flow factor and oil pressure relationship formula acquisition submodule and a formula conversion submodule;

[0091] The flow factor calculation formula acquisition submodule based on production, oil nozzle and oil pressure is used to obtain the flow factor calculation formula based on production, oil nozzle and oil pressure according to the flow formula of the gas well based on production, oil nozzle and oil pressure and the flow factor definition formula;

[0092] The flow factor and oil pressure relationship formula acquisition submodule is used to obtain the flow factor and oil pressure relationship formula according to the gas well data of the fixed oil nozzle and the flow factor definition formula;

[0093] The formula conversion submodule is used to obtain a calculation formula for the diameter of the adjustable opening oil nozzle based on the output and the oil pressure according to the flow factor calculation formula and the relationship formula between the flow factor and the oil pressure.

[0094] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calculating the diameter of an adjustable opening nozzle, characterized in that: include: According to the flow formula of the gas well based on production, oil nozzle and oil pressure, define the flow factor and obtain the flow factor definition formula; According to the gas well data of fixed nozzle and the flow factor definition formula, the calculation formula of the diameter of the adjustable nozzle based on production and oil pressure is obtained; The diameter of the adjustable opening nozzle is calculated according to a calculation formula for the diameter of the adjustable opening nozzle based on production and oil pressure and the production and oil pressure data of the gas well.

2. The method for calculating the diameter of an adjustable opening oil nozzle according to claim 1, characterized in that: The flow rate formula of the gas well based on production, oil nozzle and oil pressure is obtained based on the flow rate formula, area formula and Bernoulli equation of the gas well.

3. The method for calculating the diameter of an adjustable opening nozzle according to claim 2, characterized in that: The flow rate formula of the gas well based on production, oil nozzle and oil pressure is as follows: Where Q is the gas well production, μ is the flow coefficient, D is the nozzle diameter, P is the oil pressure, and ρ is the natural gas density.

4. The method for calculating the diameter of an adjustable opening nozzle according to claim 3, characterized in that: The flow factor calculation formula is as follows: Where K is the flow factor.

5. A method for calculating the diameter of an adjustable opening oil nozzle according to any one of claims 2 to 4, characterized in that: The formula for defining the diameter of the adjustable nozzle opening based on the gas well data and flow factor of the fixed nozzle is obtained, including: According to the flow formula of the gas well based on the production, oil nozzle and oil pressure and the flow factor definition formula, a flow factor calculation formula based on the production, oil nozzle and oil pressure is obtained; According to the gas well data of fixed nozzle and the flow factor calculation formula based on production, nozzle and oil pressure, the relationship formula between flow factor and oil pressure is obtained; According to the flow factor calculation formula and the relationship formula between the flow factor and the oil pressure, the calculation formula for the diameter of the adjustable opening oil nozzle based on the output and the oil pressure is obtained.

6. A method for calculating the diameter of an adjustable opening oil nozzle according to claim 5, characterized in that: The relationship between the flow factor and the oil pressure is shown below: K=223.37*P 0.3777 。 7. The method for calculating the diameter of an adjustable opening nozzle according to claim 6, characterized in that: The calculation formula of the adjustable opening nozzle diameter based on flow rate and oil pressure is as follows:

8. A system for calculating the diameter of an adjustable oil nozzle, characterized in that: include: Flow factor definition module, adjustable opening nozzle diameter calculation formula acquisition module and adjustable opening nozzle diameter calculation module; The flow factor definition module is used to define the flow factor and obtain the flow factor definition formula according to the flow formula of the gas well based on the production, oil nozzle and oil pressure; The adjustable opening nozzle diameter calculation formula acquisition module is used to define a formula according to the gas well data and flow factor of the fixed nozzle, and obtain the adjustable opening nozzle diameter calculation formula based on production and oil pressure; The adjustable opening nozzle diameter calculation module is used to calculate the adjustable opening nozzle diameter according to the adjustable opening nozzle diameter calculation formula based on production and oil pressure and the production and oil pressure data of the gas well.

9. The system for calculating the diameter of an adjustable nozzle opening according to claim 8, characterized in that: The module for obtaining the calculation formula of the adjustable opening nozzle diameter includes a submodule for obtaining the calculation formula of the flow factor based on the output, the nozzle and the oil pressure, a submodule for obtaining the relationship formula between the flow factor and the oil pressure and a formula conversion submodule.

10. The system for calculating the diameter of an adjustable nozzle opening according to claim 9, characterized in that: The flow factor calculation formula acquisition submodule based on production, oil nozzle and oil pressure is used to obtain the flow factor calculation formula based on production, oil nozzle and oil pressure according to the flow formula of the gas well based on production, oil nozzle and oil pressure and the flow factor definition formula; The flow factor and oil pressure relationship formula acquisition submodule is used to obtain the flow factor and oil pressure relationship formula according to the gas well data of the fixed oil nozzle and the flow factor definition formula; The formula conversion submodule is used to obtain a calculation formula for the diameter of the adjustable opening oil nozzle based on the output and the oil pressure according to the flow factor calculation formula and the relationship formula between the flow factor and the oil pressure.

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