CN-121988197-A - Lateral feeding pipe, fluid mixer and quantity determining and mixing method

CN121988197ACN 121988197 ACN121988197 ACN 121988197ACN-121988197-A

Abstract

The invention discloses a side feeding pipe, a fluid mixer and a quantity determining and mixing method, which relate to the technical field of petroleum engineering and comprise at least 2 suction pipes, wherein each suction pipe is symmetrically distributed, each suction pipe is provided with a communication valve for independently controlling the opening and closing of a suction pipe channel, a discharge pipe can be matched with the suction pipe to form a T shape, the outer circumferential surface of one end of the discharge pipe far away from the suction pipe is provided with a plurality of groups of grooves, the grooves incline at a certain angle on the outer circumferential surface, the side feeding pipe also comprises a venturi pipe, the venturi pipe is a tubular shell comprising a main inlet and a main outlet, a reducing section is arranged between the main inlet and the main outlet, the suction pipe is perpendicular to the side wall of the tubular shell on one side of the main inlet, and the outer circumferential surface of the discharge pipe where the grooves are positioned can be matched with the minimum diameter inner wall of the reducing section. The invention has the advantages of flexible structure, good mixing uniformity, adaptability to various mixing media, simple operation and control, and the like.

Inventors

LIU HUAJIE
LI ZHAOPENG
ZHANG YUWEI
DING FUQUAN
LIN WENXIANG
ZHAO XINYUE
TAO ZHIWEI

Assignees

中国石油大学(华东)

Dates

Publication Date: 20260508
Application Date: 20260409

Claims (10)

1. A side feed tube, comprising: The device comprises at least 2 suction pipes (2), wherein the suction pipes (2) are symmetrically distributed, each suction pipe (2) is provided with a communication valve which is used for independently controlling the opening and closing of a channel of the suction pipe (2), and the communication valve can also control the flow of objects flowing in the suction pipe (2); The discharge pipe (3), discharge pipe (3) can form the T type with inhaling pipe (2) cooperation, the outer periphery processing of the one end that inhaling pipe (2) was kept away from to discharge pipe (3) has a plurality of groups recess (7), recess (7) are the heliciform.
2. The side feed pipe according to claim 1, characterized in that the number of the suction pipes (2) is 2, 4 or 6, and the suction pipes (2) are symmetrically arranged along four quadrant point coordinate axes with the discharge pipe (3) as a center.
3. The side feeding pipe according to claim 1, wherein the included angle between the central axis of the groove (7) and the horizontal direction of the discharge pipe (3) is 150 ° -170 °, the ratio of the diameter of the groove (7) to the outer diameter of the discharge pipe (3) where the groove (7) is located is 0.05-0.12:1, and the ratio of the length of the groove (7) to the length of the discharge pipe (3) where the groove (7) is located is 0.77-0.85:1.
4. A fluid mixer comprising a venturi tube, wherein the venturi tube is a tubular shell comprising a main inlet (1) and a main outlet (6), a reducing section (4) is arranged between the main inlet (1) and the main outlet (6), and the fluid mixer is characterized by further comprising a lateral feeding tube as claimed in any one of claims 1-3, the suction tube (2) is perpendicular to the side wall of the tubular shell on one side of the main inlet (1), and the outer circumferential surface of a discharge tube (3) where a groove (7) is located can be matched with the inner wall of the minimum diameter of the reducing section (4).
5. The fluid mixer according to claim 4, wherein the junction of the reducing section (4) and the main outlet (6) forms a mixing chamber (5), and the outlet of the discharge pipe (3) can be matched with the mixing chamber (5) to achieve uniform mixing of the objects respectively inhaled by the main inlet (1) and the suction pipe (2).
6. A fluid mixer according to claim 4, characterized in that the ratio of the outer diameter at the smallest cross section of the reducing section (4) to the outer diameter of the main inlet (1) is 0.3-0.6:1.
7. The fluid mixer according to claim 4, characterized in that the ratio of the length of the discharge pipe (3) to the length of the main inlet (1) is 0.8-1:1.
8. The fluid mixer according to claim 4, characterized in that the ratio of the outer diameter of the communication valve interface of the suction pipe (2) to the outer diameter of the main inlet (1) is 0.2-0.3:1.
9. A method for determining the number of side feed pipes, characterized in that a fluid mixer according to any one of claims 4-8 is used, comprising the steps of: s1, respectively manufacturing a fluid mixer comprising 2, 4 and 6 suction pipes (2) and a single suction pipe (2), and preparing two detectable experimental mediums which are used as tracers and powder; S2, adopting the same main fluid as a main inlet (1) of each fluid mixer, simultaneously sucking two mediums which can be detected by each suction pipe (2) of each fluid mixer, and arranging a plurality of groups of detection devices at a main outlet (6), wherein each group of detection devices comprises a conductivity meter and a turbidity meter, the conductivity meter detects the concentration of the tracer agent, and the turbidity meter detects the concentration value of the powder and measures 10 times in total; detecting the pressure values of the main inlet (1) and the main outlet (6); s3, respectively calculating and recording a variation coefficient, a pressure loss value and the maximum total suction quantity of the main inlet (1) and the suction pipe (2) according to the detection data; Wherein, the coefficient of variation calculation formula is as follows: ; Wherein CV is the variation coefficient (%) of the tracer and the powder in the mixed fluid, sigma is the standard deviation of 10 groups of measured values, and mu is the average value of 10 groups of measured values; s4, carrying out correlation calculation according to a theoretical formula, and finally determining the working quantity of the suction pipe (2); S41, firstly, determining the following parameters, namely main inlet (1) pressure P in , main flow Q main , main fluid density rho, auxiliary medium density rho s , auxiliary medium quantity m and respective target suction flow Q i ; Since the main fluid achieves a final acceleration through the grooves (7), the spiral grooves (7) are considered as second stage throats, and the final flow velocity v 2 is calculated: ; ; Wherein A thread is the minimum flow cross section of the spiral grooves, mm 2 ;N t is the number of grooves, and d t is the diameter of the grooves, mm; The lowest static pressure P cav in the mixing chamber (5): ; wherein alpha is a comprehensive negative pressure efficiency coefficient of two-stage acceleration, and the value range is 0.5-0.7, P in is the main inlet pressure, and Mpa; S42 checking calculation of single suction pipe (2) The maximum suction flow rate of the single suction pipe (2) under the negative pressure driving can be approximated as an orifice outflow formula: ; Wherein Q s,max is the maximum suction flow of a single suction inlet, L/min, C d is the flow coefficient, the flow cross section of a single suction pipe of A s is 0.6-0.8, cm 2 ;ΔP cav =P atm ﹣P cav is the pressure difference of a mixing cavity relative to the atmosphere, MPa, P atm is the local atmospheric pressure value, MPa, P cav is the minimum static pressure in the mixing cavity, and MPa; S43 checking and calculating the parallel operation of a plurality of suction pipes (2) The total suction flow of the plurality of suction pipes (2) is not simply added up to the flow of the single suction pipe (2), and the reduction is considered: ; Wherein Q real is the total suction flow of all suction pipes, L/min, n is the number of the suction pipes actually working, beta is the reduction coefficient, and when the number of the suction pipes is 2,4 and 6, the beta is 0.89,0.66 and 0.56 respectively; S44, determining the minimum required amount of the suction pipe (2): ; ; wherein Q total is the total required suction flow, L/min; S45, comparing the calculated total suction amount with the maximum total suction amount in the step S3, and finally determining the working amount of the suction pipe (2) by combining the CV value and the pressure loss value obtained in the step S3.
10. A method of mixing fluids, characterized by using a fluid mixer according to any of claims 4-8, comprising the steps of: s1, a main inlet (1) is filled with high-pressure main fluid, and the main fluid is accelerated and rotated by using a reducing section (4) and a groove (7); S2, opening a communication valve of a suction pipe (2) to suck materials to be mixed by adopting the method for determining the number of the lateral feeding pipes according to claim 9; and S3, uniformly mixing the main fluid and the materials to be mixed in the mixing cavity (5), and discharging the mixture from the main outlet (6).

Description

Lateral feeding pipe, fluid mixer and quantity determining and mixing method Technical Field The invention relates to the technical field of petroleum engineering, in particular to a lateral feeding pipe, a fluid mixer and a quantity determining and mixing method. Background In petroleum engineering, mixing of fluids with fluids or powders is a common process link. The traditional mixing mode has the defects that the mechanical stirring equipment is complex in structure and high in energy consumption, is difficult to integrate in a high-pressure continuous pipeline system, is easy to generate sedimentation and uneven mixing on powder, the mixing efficiency of a static mixer is limited by flow velocity, has poor mixing effect on high-viscosity fluid and powder and is easy to block, the conventional jet mixer can be used for continuous injection, but the design of a single suction point of the conventional jet mixer cannot meet the requirement of simultaneous or sequential addition of multiple additives, the mixing uniformity is insufficient, cavitation is easy to generate under high-pressure fluctuation, and the system stability is influenced. Therefore, a mixing device which can adapt to the complex mixing conditions of high pressure, high viscosity, multiphase flow and multiple media in petroleum engineering and has flexible regulation and control capability is needed. Disclosure of Invention In order to solve the problems that the fluid and the fluid or the powder are unevenly mixed in the prior art and the complex mixing working conditions of high pressure, high viscosity, multiphase flow and multiple media in petroleum engineering are difficult to adapt, the invention provides a lateral feeding pipe, a fluid mixer and a quantity determining and mixing method, which are used for solving the problem that the fluid and the fluid or the powder are unevenly mixed. The technical scheme adopted for solving the technical problems is as follows: The side feeding pipe comprises at least 2 suction pipes which are symmetrically distributed, each suction pipe is provided with a communication valve which is used for independently controlling the opening and closing of a suction pipe channel, the communication valve can also control the flow of objects flowing in the suction pipe, the discharge pipe can be matched with the suction pipe to form a T shape, the outer circumferential surface of one end of the discharge pipe far away from the suction pipe is provided with a plurality of groups of grooves, and the grooves are in a spiral shape. Preferably, the number of the suction pipes is 2, 4 or 6, and the suction pipes are symmetrically arranged along four quadrant point coordinate axes by taking the discharge pipe as the center of a circle. Preferably, the included angle between the central axis of the groove and the horizontal direction of the discharge pipe is 150-170 degrees, the ratio of the diameter of the groove to the outer diameter of the discharge pipe where the groove is positioned is 0.05-0.12:1, and the ratio of the length of the groove to the length of the discharge pipe where the groove is positioned is 0.77-0.85:1. The utility model provides a fluid mixer, includes venturi, venturi is the tubular shell including main import and main export, is provided with the reducing section in the middle of main import and the main export, still includes, the side direction inlet pipe, on the lateral wall of the tubular shell of one side of suction tube perpendicular to main import, the outer periphery of discharge pipe at recess place can cooperate with the minimum diameter inner wall of reducing section. Preferably, the mixing cavity is formed at the matching position of the reducing section and the main outlet, and the outlet of the discharge pipe can be matched with the mixing cavity to realize uniform mixing of objects respectively inhaled by the main inlet and the suction pipe. Preferably, the ratio of the outer diameter of the reducing section to the outer diameter of the main inlet is 0.3-0.6:1. Preferably, the ratio of the length of the discharge pipe to the length of the main inlet is 0.8-1:1. Preferably, the ratio of the outer diameter of the communication valve interface of the suction pipe to the outer diameter of the main inlet is 0.2-0.3:1. The method for determining the number of the lateral feeding pipes adopts the fluid mixer and comprises the following steps: S1, respectively manufacturing fluid mixers comprising 2, 4 and 6 suction pipes and a single suction pipe, and preparing two detectable experimental mediums which are used as tracers and powder; S2, adopting the same main fluid as the main inlet of each fluid mixer, simultaneously sucking the two mediums which can be detected by each suction pipe of each fluid mixer, arranging a plurality of groups of detection devices at the main outlet, wherein each group of detection devices comprises a conductivity meter and a turbidity meter, the conducti