Method for calculating plugging parameters of waste mud after acidification of open-hole horizontal well and related equipment

Abstract

The invention discloses a method for calculating plugging adjusting parameters of waste mud after acidification of an open-hole horizontal well and related equipment. The method comprises the following steps: firstly, calculating the target permeability of plugging adjusting of the waste mud and the equivalent diameter of a well wall expanding and dissolving pore throat according to a ground pumping parameter and a water absorption profile interpretation result; then, the temporary plugging particle diameter and the dominant channel volume required by plugging adjustment of each stage of slug are calculated according to the quantified well wall swelling and dissolving pore throat equivalent diameter; according to the porous medium seepage theory, calculating the temporary plugging particle amount after the volume of the dominant channel is temporarily plugged in the plugging adjustment of each stage of slug in combination with the target permeability; thirdly, calculating the limit sand-carrying concentration of the plugging-adjusting waste mud of each stage of slug by utilizing the performance parameters of the waste mud and the ground pumping parameters so as to overcome the defect that the limit sand-carrying concentration and the use amount design are often inconsistent with the field reality due to different rheological properties, so that the sand is separated or the liquid amount is insufficient; and finally, calculating the total amount of the required waste mud by integrating the limit sand-carrying concentration and the temporary plugging particle amount.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water injection profile control for open hole horizontal wells in low-permeability carbonate reservoirs, and particularly relates to a method for calculating plugging parameters of abandoned mud after acidizing of open hole horizontal wells and related equipment. BACKGROUND

[0002] Open hole horizontal well completion by acidizing is an important way for economic and efficient development of low-permeability carbonate reservoirs, and is more conducive to direct conversion of oil production to water injection in the later stage, so as to realize integrated development of injection and production in horizontal wells. The wormholes formed by early acidizing completion of open hole horizontal wells continuously develop to the deep part of the reservoir, which can achieve high production of single well; after water injection, the pore throat and wormhole of the well wall will continuously expand and dissolve, increasing the water absorption of the horizontal section and strengthening the water injection oil displacement capacity. However, with the progress of water injection, the reservoir heterogeneity, the difference in wormhole development of the horizontal section, and the difference in the expanded pore throat of the well wall will continuously affect the water absorption profile of the horizontal section, resulting in that most of the sections do not contribute to water absorption and oil displacement. Therefore, to carry out water injection profile control to achieve uniform water absorption of the whole well section and maximize the effect of water injection oil displacement is the only way for efficient development of low-permeability carbonate reservoirs through integrated injection and production.

[0003] The conventional plugging mode of open hole horizontal wells mainly uses polymer as a plugging agent to carry out pump injection plugging for several months, and the high-permeability section is plugged through the flow self-selection of polymer. This process is long in time, large in dosage, and high in cost, and is not suitable for plugging of large channels after acidizing and long-term water injection well wall expansion. Abandoned mud is an economic and efficient plugging agent with good plugging performance, and can realize the plugging demand of different scale levels of expanded pore throat together with temporary plugging particles. At present, the expanded pore throat of the well wall after the influence of acidizing and long-term water injection cannot be accurately quantitatively evaluated, and the diameter and dosage of temporary plugging particles can only be determined by subjective experience; at the same time, abandoned mud has different rheological properties than water, polymer and fracturing fluid, and the design of the ultimate sand-carrying capacity and dosage often does not match the actual situation, resulting in sand washing or insufficient liquid, which cannot correctly guide the parameter design of abandoned mud plugging after acidizing of open hole horizontal wells.

[0004] In summary, the current method for calculating the plugging parameters of abandoned mud after acidizing of open hole horizontal wells cannot combine acidizing and water absorption profile to accurately calculate the expanded pore throat and carry out the diameter and dosage of temporary plugging particles; at the same time, it also cannot combine the characteristics of abandoned mud to accurately calculate the ultimate sand-carrying capacity and carry out the dosage of abandoned mud. SUMMARY

[0005] Based on the problems raised by the above background technology, the purpose of the present application is to provide a method for calculating plugging parameters of abandoned mud after acidizing of open hole horizontal wells and related equipment, which realizes the combination of acidizing and water absorption profile to accurately calculate the expanded pore throat and carry out the diameter and dosage of temporary plugging particles, and the combination of the characteristics of abandoned mud to accurately calculate the ultimate sand-carrying capacity and carry out the dosage of abandoned mud in the calculation of the plugging parameters of abandoned mud after acidizing of open hole horizontal wells.

[0006] The present application is realized by the following technical solutions:

[0007] The present application provides a method for calculating the parameters of abandoned mud for plugging after acidizing a bare hole horizontal well, comprising the following steps:

[0008] Step S1, obtaining the ground pumping parameters and the water absorption profile interpretation results of the bare hole horizontal well, and calculating the target permeability and the equivalent diameter of the well wall dissolution pore throat for abandoned mud plugging according to the ground pumping parameters and the water absorption profile interpretation results;

[0009] Step S2, calculating the temporary plugging particle diameter and the dominant channel volume required for each stage of plugging according to the equivalent diameter of the well wall dissolution pore throat;

[0010] Step S3, calculating the amount of temporary plugging particles after the dominant channel volume is temporarily plugged according to the porous medium seepage theory and the target permeability;

[0011] Step S4, calculating the limit sand-carrying concentration of abandoned mud for each stage of plugging by using the performance parameters of abandoned mud and the ground pumping parameters, and calculating the total amount of abandoned mud required by comprehensively considering the limit sand-carrying concentration and the amount of temporary plugging particles.

[0012] In the above technical solution, first, the target permeability and the equivalent diameter of the well wall dissolution pore throat for abandoned mud plugging are calculated by the ground pumping parameters and the water absorption profile interpretation results, the expansion data of the well wall pore throat after the influence of acidizing and long-term water injection are quantified, and data support is provided for the subsequent calculation of the temporary plugging particle diameter and the amount; then, the temporary plugging particle diameter and the dominant channel volume required for each stage of plugging are calculated according to the quantified equivalent diameter of the well wall dissolution pore throat; and the amount of temporary plugging particles after the dominant channel volume is temporarily plugged is calculated according to the porous medium seepage theory and the target permeability; then, the limit sand-carrying concentration of abandoned mud for each stage of plugging is calculated by using the performance parameters of abandoned mud and the ground pumping parameters, and this step is based on the flow characteristics of abandoned mud to overcome the defect that the design of the limit sand-carrying and the amount caused by different rheological properties often does not match the actual situation, resulting in sanding or insufficient liquid, which cannot correctly guide the parameter design of abandoned mud plugging after acidizing a bare hole horizontal well; finally, the total amount of abandoned mud required is calculated by comprehensively considering the limit sand-carrying concentration and the amount of temporary plugging particles, and the total amount of abandoned mud is suitable for adjusting the parameters of abandoned mud plugging after acidizing a bare hole horizontal well.

[0013] In an alternative embodiment, the target permeability and the equivalent diameter of the well wall dissolution pore throat for abandoned mud plugging are calculated according to the ground pumping parameters and the water absorption profile interpretation results, comprising the following steps:

[0014] According to the ground pump injection parameters, the injection pressure of the formation under the stable injection displacement is calculated;

[0015] According to the water absorption profile interpretation result, the open hole horizontal well is discretized at equal distances to obtain a plurality of discrete segments, and the permeability of each discrete segment is calculated;

[0016] The average water absorption of the plurality of discrete segments is calculated, the water absorption of each discrete segment is compared with the average water absorption, and the target permeability and the discrete segment requiring abandoned mud adjustment and plugging are determined according to the comparison result; wherein the permeability of the discrete segment with the smallest difference is taken as the target permeability;

[0017] The wellbore expansion pore throat equivalent diameter calculation is performed on the discrete segment requiring abandoned mud adjustment and plugging.

[0018] In an optional embodiment, according to the wellbore expansion pore throat equivalent diameter, the temporary plugging particle diameter required for each stage of plug adjustment and plugging is calculated, including:

[0019] The matrix average permeability of the open hole horizontal well is obtained, and the pore throat equivalent diameter under the matrix average permeability is calculated according to the matrix average permeability;

[0020] The maximum equivalent diameter of the wellbore expansion pore throat and the slug stage quantity of the water injection profile adjustment and plugging are set, and the temporary plugging particle diameter required for each stage of plug adjustment and plugging is calculated by using the maximum equivalent diameter, the slug stage quantity and the pore throat equivalent diameter.

[0021] In an optional embodiment, according to the wellbore expansion pore throat equivalent diameter, the dominant channel volume required for each stage of plug adjustment and plugging is calculated, including:

[0022] The acidizing well parameters of the open hole horizontal well after acidizing are obtained, and the length of the wellbore expansion pore throat of the i-th discrete segment developing to the deep part of the reservoir is calculated according to the acidizing well parameters;

[0023] The pore throat diameter at the j position along the development direction of the deep part of the reservoir is calculated according to the length;

[0024] The pore throat diameter is classified according to the pore throat diameter range required for temporary plugging of each stage of plug, and the dominant channel volume required for temporary plugging of each stage of plug adjustment and plugging is calculated.

[0025] In an optional embodiment, according to the porous medium percolation theory, the amount of temporary plugging particles required for each stage of plug adjustment and plugging after the dominant channel volume is temporarily plugged is calculated in combination with the target permeability, including:

[0026] According to the porous medium percolation theory, the permeability, porosity and specific surface area after the dominant channel volume is temporarily plugged are calculated;

[0027] calculating a proportional relationship between the permeability and the target permeability;

[0028] if the proportional relationship does not meet the proportional requirement, repeatedly calculating the permeability, the porosity and the specific surface area of the advantage channel volume after being temporarily plugged, until the proportional relationship meets the proportional requirement;

[0029] if the proportional relationship meets the proportional requirement, obtaining the particle concentration of the advantage channel volume after being temporarily plugged by the particles in each stage of the plug-adjusted plugging;

[0030] calculating the amount of the temporarily plugged particles according to the particle concentration of the advantage channel volume after being temporarily plugged by the particles in each stage of the plug-adjusted plugging.

[0031] In an optional embodiment, the limit sand-carrying concentration of the abandoned mud in each stage of the plug-adjusted plugging is calculated by using the abandoned mud performance parameters and the ground pumping parameters, including:

[0032] the settling velocity of the temporarily plugged particles in each stage of the plug-adjusted plugging is calculated by using the Stokes equation on the abandoned mud performance parameters;

[0033] the limit displacement of the abandoned mud plugging is determined according to the ground pumping parameters, and the limit sand-carrying concentration is calculated by comprehensively considering the settling velocity and the limit displacement.

[0034] In an optional embodiment, the total amount of the required abandoned mud is calculated by comprehensively considering the limit sand-carrying concentration and the amount of the temporarily plugged particles, including:

[0035] the required amount of the abandoned mud in each stage of the plug-adjusted plugging is calculated according to the limit sand-carrying concentration and the amount of the temporarily plugged particles;

[0036] the total amount of the required abandoned mud is obtained by comprehensively calculating the required amount of the abandoned mud in each stage of the plug-adjusted plugging.

[0037] The second aspect of the present application provides a system for calculating abandoned mud plugging parameters after acidizing a bare hole horizontal well, including:

[0038] a first calculation module, configured to obtain the ground pumping parameters and the water absorption profile interpretation results of the bare hole horizontal well, and calculate the target permeability of the abandoned mud plugging and the equivalent diameter of the well wall extended dissolution pore throat according to the ground pumping parameters and the water absorption profile interpretation results;

[0039] a second calculation module, configured to calculate the temporarily plugged particle diameter and the advantage channel volume required in each stage of the plug-adjusted plugging according to the equivalent diameter of the well wall extended dissolution pore throat;

[0040] a third calculation module, configured to calculate the amount of the temporarily plugged particles after the advantage channel volume is temporarily plugged in each stage of the plug-adjusted plugging according to the target permeability and the porous medium percolation theory;

[0041] The fourth calculation module is configured to calculate a limit sand-carrying concentration of the abandoned mud for plugging each stage slug by using the abandoned mud performance parameter and the surface injection parameter, and to calculate a total amount of the abandoned mud required by comprehensively using the limit sand-carrying concentration and the amount of the temporary plugging particles.

[0042] The third aspect of the present application provides an electronic device, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the method for calculating the plugging parameter of the abandoned mud after the open hole horizontal well is acidized when executing the computer program.

[0043] The fourth aspect of the present application provides a computer readable storage medium, which stores a computer program, and the computer program is executable on the processor to implement the method for calculating the plugging parameter of the abandoned mud after the open hole horizontal well is acidized.

[0044] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0045] 1. The present application combines acidification and water absorption profile to accurately calculate the expansion pore throat and carry out the design of the temporary plugging particle diameter and the amount.

[0046] 2. The present application combines the characteristics of the abandoned mud to accurately calculate the limit sand-carrying capacity and carry out the design of the abandoned mud amount. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings:

[0048] Figure 1 The open hole horizontal well fiber logging water absorption profile interpretation result provided for the embodiment 1 of the present application;

[0049] Figure 2 The equivalent diameter distribution of the well wall expansion pore throat of the discrete section which needs to carry out the mud plugging provided for the embodiment 1 of the present application;

[0050] Figure 3 The acid amount and the porosity distribution of the discrete section which needs to carry out the abandoned mud plugging provided for the embodiment 1 of the present application;

[0051] Figure 4 The length distribution of the well wall expansion pore throat which develops to the deep part of the reservoir provided for the embodiment 1 of the present application;

[0052] Figure 5A structural schematic diagram of an electronic device provided for Embodiment 3 of the present application. DETAILED DESCRIPTION

[0053] In order to make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be given below in combination with embodiments and drawings, the illustrative embodiments of the present application and the description thereof are only used to explain the present application, and do not limit the present application.

[0054] The present application provides a method for calculating the plugging parameters of abandoned mud after acidizing of a bare hole horizontal well, and specifically, the method comprises the following steps:

[0055] Step S1, obtaining the ground pumping parameters and the water absorption profile interpretation results of the bare hole horizontal well, and calculating the target permeability of abandoned mud plugging and the equivalent diameter of wellbore dissolution pore throat according to the ground pumping parameters and the water absorption profile interpretation results;

[0056] Step S2, calculating the temporary plugging particle diameter and the dominant channel volume required for each stage of plug plugging according to the equivalent diameter of the wellbore dissolution pore throat;

[0057] Step S3, calculating the amount of temporary plugging particles after the dominant channel volume is temporarily plugged according to the target permeability and the porous medium percolation theory;

[0058] Step S4, calculating the limit sand-carrying concentration of abandoned mud for each stage of plug plugging by using the performance parameters of abandoned mud and the ground pumping parameters, and calculating the total amount of abandoned mud required by comprehensively considering the limit sand-carrying concentration and the amount of temporary plugging particles.

[0059] It should be noted that at present, the wellbore pore throat cannot be accurately quantitatively evaluated after acidizing and long-term water injection expansion, and the temporary plugging particle diameter and the amount are often only determined by subjective experience; at the same time, the abandoned mud has different rheological properties than water, polymer and fracturing fluid, and the design of the limit sand-carrying and the amount often does not match the actual situation, resulting in sand removal or insufficient liquid, which cannot correctly guide the parameter design of abandoned mud plugging after acidizing of the bare hole horizontal well.

[0060] Based on this, the embodiment provides a method for calculating abandoned mud plugging parameters after acidizing a bare hole horizontal well. First, the target permeability and the equivalent diameter of the wellbore pore throat after expansion under the influence of acidizing and long-term water injection are calculated by using the surface pumping parameters and the water absorption profile interpretation results, so as to quantify the expansion data of the wellbore pore throat, and provide data support for subsequent calculation of the diameter and dosage of the temporary plugging particles; then, the diameter of the temporary plugging particles and the volume of the dominant channel required for plugging at each stage are calculated according to the equivalent diameter of the wellbore pore throat after expansion; and the dosage of the temporary plugging particles after the dominant channel volume is plugged at each stage is calculated according to the porous medium percolation theory and the target permeability; then, the limit sand-carrying concentration of the abandoned mud at each stage is calculated by using the performance parameters of the abandoned mud and the surface pumping parameters, and this step is based on the flow characteristics of the abandoned mud to overcome the defect that the design of the limit sand-carrying and dosage caused by different rheological properties is often inconsistent with the actual situation, resulting in sand-out or insufficient liquid, and unable to correctly guide the parameter design of the abandoned mud plugging after acidizing the bare hole horizontal well; finally, the total amount of the required abandoned mud is calculated by comprehensively considering the limit sand-carrying concentration and the dosage of the temporary plugging particles, and the total amount of the required abandoned mud is suitable for adjusting the abandoned mud plugging parameters after acidizing the bare hole horizontal well.

[0061] In an alternative embodiment, the target permeability and the equivalent diameter of the wellbore pore throat after expansion for abandoned mud plugging are calculated according to the surface pumping parameters and the water absorption profile interpretation results, including the following steps:

[0062] According to the surface pumping parameters, the injection pressure of the formation under the stable water injection displacement is calculated;

[0063] According to the water absorption profile interpretation results, the bare hole horizontal well is discretized at equal distances to obtain a plurality of discrete sections, and the permeability of each discrete section is calculated;

[0064] The average water absorption of the plurality of discrete sections is calculated, the water absorption of each discrete section is compared with the average water absorption, and the target permeability and the discrete section requiring abandoned mud plugging are determined according to the comparison result; wherein, the permeability of the discrete section with the smallest difference is taken as the target permeability;

[0065] The equivalent diameter of the wellbore pore throat after expansion for the discrete section requiring abandoned mud plugging is calculated.

[0066] In the embodiment, the surface pumping parameters are obtained by measuring the bare hole horizontal well by using an optical fiber, and the friction of the horizontal section is ignored during the measurement. Then, the injection pressure of the formation under the stable water injection displacement is calculated according to the surface pumping parameters, wherein the calculation process of the injection pressure is shown in formula (1):

[0067]

[0068] In the formula, PT P is the injection pressure of the formation under the stable injection rate, MPa; P S P is the injection pressure of the ground under the stable injection rate, MPa; ΔP T P is the frictional resistance of the working string along the way, MPa; p w P is the density of the injection water, Kg / m 3 ; L p P is the length of the string, m; Q w P is the stable injection rate, bbl / d; N R P is the Reynolds number, dimensionless; μ w P is the viscosity of the injection water, mPa·s; d p P is the equivalent flow diameter.

[0069] Further, the calculation process of the equivalent flow diameter is shown in formula (2):

[0070]

[0071] In the formula, r N P is the casing diameter outside the fiber-optic logging coiled tubing, m; r T P is the fiber-optic logging coiled tubing diameter, m.

[0072] According to the water absorption profile interpretation result, the open hole horizontal well is discretized at equal distances to obtain a plurality of discrete segments, and the permeability K i of each discrete segment is calculated by using formula (3):

[0073]

[0074] In the formula, K i P is the permeability of the i-th discrete segment, mD; Q i P is the water absorption of the i-th discrete segment in the water absorption profile interpretation result, bbl / d; r w P is the horizontal wellbore radius, m; L i P is the length of each discrete segment when discretized at equal distances, m; L H P is the length of the horizontal section, m; i = 0, 1, …, m and dimensionless.

[0075] The average water absorption of the plurality of discrete segments is calculated: The water absorption Q i of each discrete segment is compared with the average water absorption, so as to determine the target permeability and the discrete segment that needs to carry out the abandoned mud plugging.

[0076] Among them, for the target permeability, the water absorption Q i of each discrete segment is compared with the average water absorption, and the permeability of the discrete segment with the smallest difference between them is selected as the target permeability KB .

[0077] For the discrete section that needs to carry out the abandoned mud plugging, several discrete sections are traversed, wherein the initial value of j is 1, the water absorption amount Q i of each discrete section is compared with the average water absorption amount , when , it is indicated that the discrete section needs to carry out the abandoned mud plugging.

[0078] Further, the equivalent diameter of the wellbore dissolution pore throat of the discrete section that needs to carry out the abandoned mud plugging is calculated by using formula (4):

[0079]

[0080] In the formula, W j is the equivalent diameter of the wellbore dissolution pore throat of the jth discrete section, μm. K is the number of the discrete sections that produce the wellbore dissolution pore throat, and is also the number of the discrete sections that need to carry out the abandoned mud plugging, dimensionless; i = 0, 1, …, m and

[0081] Through the above steps, it can be determined that a total of K sections need to carry out the abandoned mud plugging after the acidification of the open hole horizontal well, and the target permeability of the plugging is K B .

[0082] In an optional embodiment, according to the equivalent diameter of the wellbore dissolution pore throat, the temporary plugging particle diameter that needs to be temporarily plugged for each stage of the plug is calculated, including:

[0083] Obtaining the matrix average permeability of the open hole horizontal well, and calculating the pore throat equivalent diameter under the matrix average permeability according to the matrix average permeability;

[0084] Setting the maximum value of the equivalent diameter of the wellbore dissolution pore throat and the slug stage quantity of the water injection profile plugging, and calculating the temporary plugging particle diameter that needs to be temporarily plugged for each stage of the plug by using the maximum value of the equivalent diameter, the slug stage quantity and the pore throat equivalent diameter.

[0085] Firstly, the geological data of the open hole horizontal well is obtained, the matrix average permeability is obtained through the geological data, and is recorded as K o .

[0086] The pore throat equivalent diameter under the matrix average permeability is calculated according to the matrix average permeability, wherein the pore throat equivalent diameter under the matrix average permeability is referred to formula (5):

[0087]

[0088] Set the maximum value of the equivalent diameter of the wellbore dissolution pore throat as W max And, the slug level quantity of the water injection profile control is M, in the embodiment, M≤3; the maximum value of the equivalent diameter, the slug level quantity and the pore throat equivalent diameter are used to calculate the temporary plugging particle diameter required by each level of slug control, wherein the temporary plugging particle diameter required by the first level of slug control is W o The temporary plugging particle diameter required by the second level of slug control is The temporary plugging particle diameter required by the third level of slug control is Wherein, the temporary plugging particle diameter is rounded to the hundredth place.

[0089] Further, the pore throat diameter range required by the first level of slug control is The pore throat diameter range required by the second level of slug control is The pore throat diameter range required by the third level of slug control is

[0090] In an alternative embodiment, according to the wellbore dissolution pore throat equivalent diameter, the dominant channel volume required by each level of slug control is calculated, comprising:

[0091] The acidizing well parameters after the acidizing of the open hole horizontal well are obtained, and the length of the wellbore dissolution pore throat of the ith discrete section developing towards the deep part of the reservoir is calculated according to the acidizing well parameters;

[0092] The pore throat diameter at the j position along the development direction of the deep part of the reservoir is calculated according to the length;

[0093] The pore throat diameter is classified according to the pore throat diameter range required by each level of slug control, and the dominant channel volume required by each level of slug control is calculated.

[0094] The acidizing well parameters after the acidizing of the open hole horizontal well are obtained, and the length of the wellbore dissolution pore throat of the ith discrete section developing towards the deep part of the reservoir is calculated according to the acidizing well parameters, the calculation process of the length is shown in formula (6):

[0095]

[0096] In the formula, L i is the length of the wellbore dissolution pore throat of the ith discrete section developing towards the deep part of the reservoir, m; τ is the tortuosity of the dissolution pore throat development, dimensionless; Q Ai is the acid volume during the acidizing of the ith discrete section, m3; is the porosity of the ith discrete section in the well logging interpretation, %; PV is the PV number of the acid fluid penetrating the core of the horizontal well, dimensionless.

[0097] Wherein, the equivalent diameter of the wellbore dissolution pore throat of the ith discrete section decreases along the development direction of the deep part, and finally decreases to W oTherefore, the pore throat diameter at the j position along the development direction of the deep part of the reservoir is calculated according to the length, wherein the calculation process of the pore throat diameter is shown in formula (7):

[0098]

[0099] In the formula, W ij is the equivalent diameter W of the well wall extended dissolution pore throat of the i discrete section i The pore throat diameter at the j position along the development direction of the deep part is μm; when W ij ≤0, the calculation is stopped, and L wi is the length m of the well wall extended dissolution pore throat of the i discrete section along the development of the deep part.

[0100] The pore throat diameter is classified according to the pore throat diameter range required to be temporarily blocked by each stage of the plug, and the dominant channel volume required to be temporarily blocked by each stage of the plug is calculated according to the classified pore throat diameter range required to be temporarily blocked by each stage of the plug. The calculation of the dominant channel volume is shown in formula (8).

[0101]

[0102] In the formula, V1 is the dominant channel volume required to be temporarily blocked by the first stage of the plug, m 3 ; V2 is the dominant channel volume required to be temporarily blocked by the second stage of the plug, m 3 ; and V3 is the dominant channel volume required to be temporarily blocked by the third stage of the plug, m 3 .

[0103] In an optional embodiment, according to the porous medium seepage theory, the particle amount required to be temporarily blocked by each stage of the plug after the dominant channel volume is temporarily blocked is calculated in combination with the target permeability, comprising:

[0104] According to the porous medium seepage theory, the permeability, porosity and specific surface area after the dominant channel volume is temporarily blocked are calculated;

[0105] The proportional relationship between the permeability and the target permeability is calculated;

[0106] If the proportional relationship does not meet the proportion requirement, the permeability, porosity and specific surface area after the dominant channel volume is temporarily blocked are repeatedly calculated until the proportional relationship meets the proportion requirement;

[0107] If the proportional relationship meets the proportion requirement, the particle concentration after the dominant channel volume is temporarily blocked by the particles in each stage of the plug is obtained;

[0108] The particle amount required to be temporarily blocked by each stage of the plug is calculated according to the particle concentration after the dominant channel volume is temporarily blocked by the particles in each stage of the plug.

[0109] According to the porous medium seepage theory, the permeability, porosity and specific surface area of the volume of the dominant channel after being temporarily plugged are calculated;

[0110] The calculation process of the permeability of the volume of the dominant channel after being temporarily plugged is shown in formula (9):

[0111]

[0112] In the formula, K Fi is the permeability of the dominant channel after being temporarily plugged by the particles, mD; is the porosity of the dominant channel after being temporarily plugged by the particles, dimensionless; S i is the specific surface area of the particles in the dominant channel, m 2 / m 3 ; i=1, 2, 3 is the temporary plugging level.

[0113] The calculation process of the porosity of the volume of the dominant channel after being temporarily plugged is shown in formula (10):

[0114]

[0115] In the formula, is the porosity of the dominant channel after being temporarily plugged by the particles, and a is the temporary plugging particle accumulation efficiency, dimensionless; C i is the particle concentration of the dominant channel after being temporarily plugged by the particles, kg / m 3 ; p pi is the density of the temporary plugging particles, kg / m 3 ; i=1, 2, 3 is the temporary plugging level.

[0116] The calculation process of the specific surface area of the volume of the dominant channel after being temporarily plugged is shown in formula (11):

[0117]

[0118] In the formula, r i is the temporary plugging particle diameter required for the i-th stage of plugging, μm.

[0119] The proportional relationship between the permeability and the target permeability is calculated: The proportional requirement in the present embodiment is set to 10%, and the proportional relationship is compared with the proportional requirement:

[0120] If the proportional relationship does not meet the proportional requirement, i.e. C i =C i -50, the calculation of formula (9) to (11) is repeated until the proportional relationship meets the proportional requirement;

[0121] If the proportional relationship meets the proportional requirement, i.e. C i is the particle concentration required for the i th stage of the plug adjustment and control.

[0122] The amount of temporary blocking particles is calculated according to the particle concentration after the dominant channel volume is temporarily blocked in each stage of the plug adjustment and control. The calculation process of the amount of temporary blocking particles is shown in formula (12) :

[0123]

[0124] In the formula, V Pi is the amount of temporary blocking particles required for the i th stage of the plug adjustment and control, Kg; δ is the retention rate of the temporary blocking particles, dimensionless; i = 1, 2, 3 is the temporary blocking stage number.

[0125] In an alternative embodiment, the limit sand-carrying concentration of the abandoned mud in each stage of the plug adjustment and control is calculated using the abandoned mud performance parameters and the surface pumping parameters, comprising:

[0126] The abandoned mud performance parameters are calculated using the Stokes equation to obtain the settling velocity of the temporary blocking particles in each stage of the plug adjustment and control;

[0127] The limit displacement of the abandoned mud plug adjustment is determined according to the surface pumping parameters, and the limit displacement and the limit displacement are calculated to obtain the limit sand-carrying concentration.

[0128] In this embodiment, the abandoned mud performance parameters include the density and viscosity of the abandoned mud.

[0129] In the formula, the abandoned mud performance parameters are calculated using the Stokes equation to obtain the settling velocity of the temporary blocking particles in each stage of the plug adjustment and control. The calculation process of the settling velocity is shown in formula (13) :

[0130]

[0131] In the formula, V Si is the settling velocity of the temporary blocking particles in each stage of the plug adjustment and control, m / s; D pi is the diameter of the temporary blocking particles in each stage of the plug adjustment and control, m; ρ mud is the density of the abandoned mud in each stage of the plug adjustment and control, kg / m3; μ mud is the viscosity of the abandoned mud, mPa·s; i = 1, 2, 3 is the temporary blocking stage number.

[0132] The limit displacement of the abandoned mud plug adjustment is determined according to the surface pumping parameters, and the limit displacement and the limit displacement are calculated to obtain the limit sand-carrying concentration.

[0133]

[0134] In the formula, Cmaxi Limit sand-carrying concentration of abandoned mud for each stage plug, kg / m 3 ; Q L Limit displacement of abandoned mud for each stage plug, m 3 / s; ε is dynamic pore constant, dimensionless; i = 1, 2, 3 is the temporary plugging number.

[0135] In an alternative embodiment, the total amount of abandoned mud required is calculated by integrating the limit sand-carrying concentration and the amount of temporary plugging particles, comprising:

[0136] The amount of abandoned mud required for each stage plug is calculated according to the limit sand-carrying concentration and the amount of temporary plugging particles;

[0137] The amount of abandoned mud required for each stage plug is integrated to obtain the total amount of abandoned mud required.

[0138] The amount of abandoned mud required for each stage plug is calculated according to the limit sand-carrying concentration and the amount of temporary plugging particles, and the amount of abandoned mud required for each stage plug is integrated to obtain the total amount of abandoned mud required, the process of which is shown in formula (15):

[0139]

[0140] In the formula, V mudi is the amount of abandoned mud required for each stage plug, m3; V mud is the total amount of abandoned mud required for plugging, m3; i = 1, 2, 3 is the temporary plugging number.

[0141] In order to make the technical solution clearer, the present embodiment describes the parameter calculation method for abandoned mud plugging after open hole horizontal well acidification with specific data, which corresponds to the above method one by one, and the specific steps are as follows:

[0142] Step S1, obtain the optical fiber logging ground pumping parameters and equipment parameters, the casing diameter r N outside the optical fiber logging coiled tubing = 0.076 m, the optical fiber logging coiled tubing diameter r T = 0.048 m, the ground pumping pressure P S under stable water injection displacement = 3.94 MPa, the density of injected water ρ w = 1000 Kg / m3, the pipe column length L p = 2500 m, the stable water injection displacement Q w = 4500 bbl / d, the viscosity of injected water μ w = 1.0 mPa·s, the initial pressure of the reservoir P r = 25.7 MPa.

[0143] According to formulas (1) and (2), the injection pressure of the formation under stable water injection rate is calculated to be P_T = 28.3 MPa.

[0144] Obtain the horizontal wellbore radius r w =0.076m, the length L of the horizontal segment H =1160m, with horizontal segments of the naked eye discrete at 10m intervals, based on the interpretation results of the fiber optic logging water intake profile, such as Figure 1 As shown.

[0145] Based on formulas (3) and (4), the target permeability K of the waste mud plugging is calculated. B =566mD, the number of discrete sections requiring waste mud plugging K=42, and the equivalent diameter W of the wellbore throat for the discrete sections requiring mud plugging. j Distribution, such as Figure 2 As shown.

[0146] Step S2: Obtain the average matrix permeability K of the horizontal well. o =10mD, set the slug stage quantity for water injection profile plugging to M=3, and combine the equivalent diameter of the wellbore dilatation pore throat, calculate the temporary plugging particle diameter W required for the first stage slug plugging according to formula (5). o =300μm, the diameter of the temporary plugging particles required for the second-stage slug plug adjustment. The diameter of the temporary plugging particles required for third-stage slug adjustment

[0147] Obtain the acidizing completion parameters of the horizontal well to determine the acid quantity and porosity required for acidizing discrete sections that need to be plugged with waste mud, such as... Figure 3 The distribution, the tortuosity τ of the diffusing throat development is 1.6, the PV number of horizontal well acid penetration into the core is 0.5, and it is dimensionless. According to formulas (6) and (7), the length of the diffusing throat in the wellbore developing into the deep reservoir is calculated as follows: Figure 4 As shown, the pore throat diameter varies along the deep development direction.

[0148] According to formula (8), the volume of the dominant channel requiring temporary blocking for the first-stage sluice blockage adjustment is calculated to be V1 = 0.3652 m³. 3 The volume of the advantageous passage that needs to be temporarily blocked in the second-stage blockade is V2 = 0.8271 m³. 3 The volume of the advantageous passage that needs to be temporarily blocked in the third-stage blockade is V3 = 1.2762 m³. 3 .

[0149] Step S3: Set the particle concentration C after the dominant channel is temporarily blocked by particles in each stage of blockage adjustment. i =5000kg / m 3 The temporary plugging particle packing efficiency α = 0.7, and the density ρ of the temporary plugging particles...pi Both are 2650kg / m 3 Based on the diameter of the temporary plugging particles required for each stage of the sluice gate, and according to formulas (9) to (11), the particle concentration C1 required for the first stage of the sluice gate is calculated to be 3000 kg / m³. 3 The required particle concentration C2 for the second-stage sluice gate plugging is 3500 kg / m³. 3 The particle concentration C3 required for the third-stage sluice gate plugging is 3550 kg / m³. 3 .

[0150] The retention rate of the temporary plugging particles is set to δ = 0.5. According to formula (12), the amount of temporary plugging particles required for the first stage slug blockage adjustment is 2190 kg, the amount of temporary plugging particles required for the second stage slug blockage adjustment is 5790 kg, and the amount of temporary plugging particles required for the third stage slug blockage adjustment is 9060 kg.

[0151] Step S4: Obtain the density ρ of the waste mud during the plugging process of each stage. mud Both are 1160 kg / m 3 The viscosity μ of the waste mud mud =40 mPa·s, the ultimate discharge capacity Q of waste mud for plugging L =0.00827m 3 / s, setting the dynamic porosity constant ε=0.4, and combining the diameter of the temporary plugging particles, according to formulas (13) and (14), the settling velocity of the temporary plugging particles during the first-stage slug plugging process is calculated to be 0.0182m / s, and the ultimate sand-carrying concentration of the waste mud from the slug plugging process is 4.7kg / m 3 During the second-stage slug plugging process, the settling velocity of the temporarily plugging particles was 0.0528 m / s, and the ultimate sand-carrying concentration of the waste mud from this slug plugging process was 22.9 kg / m³. 3 During the third-stage slug plugging process, the settling velocity of the temporarily plugging particles was 0.124 m / s, and the limiting sand-carrying concentration of the waste mud from this slug plugging process was 82.1 kg / m³. 3 .

[0152] According to formula (15), the required amount of waste mud for the first-stage sluice plug is calculated to be 469 m³. 3 The required amount of waste mud for the second-stage sluice blockage is 252m³. 3 The required amount of waste mud for the third-stage plugging is 110m³. 3 The total amount of waste mud required for the blockage is 831m³. 3 .

[0153] The calculated parameters for the waste mud plugging after acidizing the open-hole horizontal well are shown in Table 1.

[0154]

[0155] Embodiment 2 of this invention provides a calculation system for waste mud plugging parameters after acidizing in open-hole horizontal wells. This calculation system involves keywords related to control systems; specifically, the calculation system for waste mud plugging parameters after acidizing in open-hole horizontal wells includes:

[0156] The first calculation module is used to obtain the surface pumping parameters and water intake profile interpretation results of the open-hole horizontal well, and calculate the target permeability of waste mud plugging and the equivalent diameter of the well wall dilation pore throat based on the surface pumping parameters and the water intake profile interpretation results;

[0157] The second calculation module is used to calculate the diameter of the temporary plugging particles and the volume of the dominant channel required for each stage of slug plugging based on the equivalent diameter of the wellbore dilatation pore throat.

[0158] The third calculation module is used to calculate the amount of temporary plugging particles used in each stage of slug blockage after the volume of the dominant channel is temporarily blocked, based on the porous media seepage theory and the target permeability.

[0159] The fourth calculation module is used to calculate the ultimate sand-carrying concentration of the waste mud for each stage of sluice plugging using the performance parameters of the waste mud and the ground pumping parameters, and to calculate the total amount of waste mud required by combining the ultimate sand-carrying concentration and the amount of temporary plugging particles.

[0160] Embodiment 3 of the present invention provides an electronic device, such as... Figure 5 As shown, the electronic device includes a processor 21, a memory 22, an input device 23, and an output device 24; the number of processors 21 in the computer device can be one or more. Figure 5 Taking a processor 21 as an example; the processor 21, memory 22, input device 23, and output device 24 in an electronic device can be connected via a bus or other means. Figure 5 For example, the connection between China and Israel is via a bus; the processor includes a processor chip.

[0161] The memory 22, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules. The processor 21 executes various functional applications and data processing of the electronic device by running the software programs, instructions, and modules stored in the memory 22, that is, implementing the method for calculating the plugging parameters of waste mud after acidizing in open-hole horizontal wells in Embodiment 1.

[0162] The memory 22 may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a given function; the data storage area may store data created based on terminal usage. Furthermore, the memory 22 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory, or other non-volatile solid-state storage device. In some instances, the memory 22 may further include memory remotely located relative to the processor 21, which can be connected to the electronic device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0163] Input device 23 can be used to receive user input such as ID and password. Output device 24 is used to output the network configuration page.

[0164] Embodiment 4 of the present invention also provides a computer-readable storage medium, wherein the computer-executable instructions, when executed by a computer processor, are used to implement the method for calculating the plugging parameters of waste mud after acidizing in open-hole horizontal wells as provided in Embodiment 1.

[0165] The storage medium containing computer-executable instructions provided in this embodiment of the invention is not limited to the method operation provided in Embodiment 1, but can also perform related operations in the method for calculating waste mud plugging parameters after acidizing open-hole horizontal wells provided in any embodiment of the invention.

[0166] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for calculating parameters of waste mud plugging after acidizing in open-hole horizontal wells, characterized in that, Includes the following steps: Step S1: Obtain the surface pumping parameters and water intake profile interpretation results of the open-hole horizontal well, and calculate the target permeability of waste mud plugging and the equivalent diameter of the well wall dilation pore throat based on the surface pumping parameters and the water intake profile interpretation results; Step S2: Based on the equivalent diameter of the wellbore dilatation pore throat, calculate the temporary plug particle diameter and dominant channel volume required for each stage of slug plug adjustment; Step S3: Based on the porous media seepage theory and the target permeability, calculate the amount of temporary plugging particles used in each stage of slug blockage after the volume of the dominant channel is temporarily blocked. Step S4: Calculate the maximum sand-carrying concentration of the waste mud for each stage of the sluice blockage using the waste mud performance parameters and the ground pumping parameters, and calculate the total amount of waste mud required by combining the maximum sand-carrying concentration and the amount of temporary plugging particles.

2. The method for calculating the plugging parameters of waste mud after acidizing in open-hole horizontal wells according to claim 1, characterized in that, The target permeability and equivalent diameter of the wellbore dilation pore throat are calculated based on the surface pumping parameters and the water intake profile interpretation results, including the following steps: Calculate the injection pressure of the formation under a stable water injection rate based on the surface pumping parameters; Based on the interpretation results of the water absorption profile, the open-hole horizontal well is discretized at equal intervals to obtain several discrete segments, and the permeability of each discrete segment is calculated. Calculate the average water absorption of several discrete segments, compare the water absorption of each discrete segment with the average water absorption, and determine the target permeability and the discrete segments that need to be plugged with waste mud based on the comparison results; among them, the permeability of the discrete segment with the smallest difference is taken as the target permeability. The equivalent diameter of the wellbore dilation pore throat is calculated for discrete sections that require waste mud plugging.

3. The method for calculating the plugging parameters of waste mud after acidizing in open-hole horizontal wells according to claim 1, characterized in that, Based on the equivalent diameter of the wellbore's expanded throat, calculate the diameter of the temporary plugging particles required for each stage of slug plugging, including: Obtain the average matrix permeability of the open-hole horizontal well, and calculate the equivalent diameter of the pore throat under the average matrix permeability. The maximum equivalent diameter of the wellbore dilation pore throat and the slug level quantity for water injection profile plugging are set. The diameter of the temporary plugging particles required for each level of slug plugging is calculated using the maximum equivalent diameter, the slug level quantity, and the equivalent diameter of the pore throat.

4. The method for calculating the plugging parameters of waste mud after acidizing in open-hole horizontal wells according to claim 3, characterized in that, Based on the equivalent diameter of the wellbore's expanded throat, calculate the volume of the dominant channel that needs to be temporarily plugged for each stage of slug plugging, including: Obtain the acidized well parameters after acidizing the open-hole horizontal well, and calculate the length of the throat of the well wall dilation pore in the i-th discrete section developing into the deep reservoir based on the acidized well parameters; Calculate the pore throat diameter at position j along the deep development direction of the reservoir based on the length; The orifice throat diameters are classified according to the range of orifice throat diameters that need to be temporarily blocked for each stage of the slug, and the volume of the advantageous channel that needs to be temporarily blocked for each stage of the slug is calculated.

5. The method for calculating the plugging parameters of waste mud after acidizing in open-hole horizontal wells according to claim 1, characterized in that, Based on the porous media seepage theory, and combined with the target permeability, the amount of temporary plugging particles used in each stage of slug plugging after the dominant channel volume is temporarily blocked is calculated, including: Based on the seepage theory of porous media, the permeability, porosity and specific surface area after the volume of the dominant channel is temporarily blocked are calculated. Calculate the ratio between the penetration rate and the target penetration rate; If the ratio does not meet the ratio requirement, the permeability, porosity and specific surface area after the volume of the dominant channel is temporarily blocked are calculated repeatedly until the ratio meets the ratio requirement. If the ratio relationship meets the ratio requirement, the particle concentration after the dominant channel volume is temporarily blocked by particles in each stage of blockage adjustment is obtained. The amount of temporary blocking particles is calculated based on the particle concentration after the dominant channel volume is temporarily blocked by particles in each stage of blockage adjustment.

6. The method for calculating the plugging parameters of waste mud after acidizing in open-hole horizontal wells according to claim 1, characterized in that, The ultimate sand-carrying concentration of the waste mud for each stage of sluice plugging is calculated using the performance parameters of the waste mud and the surface pumping parameters, including: The performance parameters of the waste mud were calculated using the Stokes equations to obtain the settling velocity of the temporarily plugged particles during each stage of slug plugging process. The ultimate discharge rate of waste mud for plugging is determined based on the ground pumping parameters. The ultimate sand-carrying concentration is obtained by combining the settling velocity and the ultimate discharge rate.

7. The method for calculating the plugging parameters of waste mud after acidizing in open-hole horizontal wells according to claim 6, characterized in that, The total amount of waste mud required, calculated by combining the aforementioned limiting sand-carrying concentration and the amount of temporary plugging particles, includes: The required amount of waste mud for each stage of plugging is calculated based on the maximum sand-carrying concentration and the amount of temporary plugging particles. The required amount of waste mud for each stage of plugging and tackling is calculated to obtain the total amount of waste mud needed.

8. A system for calculating parameters of waste mud plugging after acidizing in open-hole horizontal wells, characterized in that, The method for calculating plugging parameters of waste mud after acidizing in open-hole horizontal wells according to any one of claims 1 to 7, wherein the plugging parameter calculation system comprises: The first calculation module is used to obtain the surface pumping parameters and water intake profile interpretation results of the open-hole horizontal well, and calculate the target permeability of waste mud plugging and the equivalent diameter of the well wall dilation pore throat based on the surface pumping parameters and the water intake profile interpretation results; The second calculation module is used to calculate the diameter of the temporary plugging particles and the volume of the dominant channel required for each stage of slug plugging based on the equivalent diameter of the wellbore dilatation pore throat. The third calculation module is used to calculate the amount of temporary plugging particles used in each stage of slug blockage after the volume of the dominant channel is temporarily blocked, based on the porous media seepage theory and the target permeability. The fourth calculation module is used to calculate the ultimate sand-carrying concentration of the waste mud for each stage of sluice plugging using the performance parameters of the waste mud and the ground pumping parameters, and to calculate the total amount of waste mud required by combining the ultimate sand-carrying concentration and the amount of temporary plugging particles.

9. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the method for calculating the plugging parameters of waste mud after acidizing in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the method for calculating the plugging parameters of waste mud after acidizing in any one of claims 1 to 7.

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