Method for estimating total flow of a cut-off valve based on fluid cutting

Abstract

This invention discloses a method for estimating the total flow rate of a shut-off valve based on fluid cutting. Its main working mechanism combines the cutting action of fluid on metals or non-metals with the control function of an energy storage shut-off valve, achieving the function of quantitative automatic closure of the shut-off valve. This designed shut-off valve can be applied to applications requiring quantitative fluid control. When installed on completion tubing or screens in oilfield production, it can automatically achieve the development effect of limiting the total flow rate per unit length of production tubing.

Description

Technical Field

[0001] This invention belongs to the field of petroleum engineering, specifically relating to a method for estimating the total flow of a shut-off valve based on fluid cutting. Background Technology

[0002] In existing oilfield well completion and development processes, valve operation relies primarily on remote hydraulic, electronic, or hybrid electro-hydraulic methods from the surface during the stratified and segmented extraction process. The ability to automatically shut down valves after quantitative development has not yet been achieved.

[0003] To address the aforementioned issues, this patent proposes a valve design based on fluid cutting rate estimation. The valve designed according to this invention is installed on an oil well development screen unit. During oil well production, it can achieve quantitative development results for a single screen and automatically realize segmented fluid control of the wellbore. This solves the problem of dynamic coupling effect of shaft-diameter fluid in horizontal wells and addresses the current production challenges of high water cut and rapid rise in water content in horizontal wells. Summary of the Invention

[0004] This invention applies to automatic flow control shut-off valves, whose main mechanism is based on the valve's function designed using the cutting (or erosion) action of fluid on metal. The main contents of this invention include: ① A method for estimating the total flow through the valve body using the cutting rate of fluid on metals or non-metals. ② A design incorporating a cutting fluid profile adjustment component installed on the valve body's flow channel.

[0005] 1. A design method for estimating the total flow through a valve body by utilizing the cutting rate of fluid on metal or non-metal. This involves designing a control flow channel, also known as a fluid cutting channel, on the valve body to control the fluid channel for the valve's closing function. During operation, the fluid in the valve body cutting channel causes a change in the cutting amount of the control component. By calculating the total change time of the control component, the total flow rate of the valve is calculated. Brief explanation: (1) Under test conditions and a certain flow rate v, the cutting rate Vc of the control rod (metal or non-metal) is obtained using the target fluid (single fluid or mixed fluid). The effective cutting dimension L of the control rod for closing the valve is designed, and then the working time of the fluid cutting component (control component of the valve) is designed: T=L / Vc. (2) The total flow of the valve can be calculated using the formula for calculating the total fluid volume of the valve: Q=S×v×T. (where Q represents the total flow rate; S represents the cross-sectional area (the total inflow area of ​​all fluids passing through the valve); v represents the average flow rate of the fluid). Of course, professional software is required for calculation in practical applications. (Note: The time variation formula obtained by using other pressure differences and pressures is essentially the same as the speed formula mentioned above.) (3) Since the medium in which fluid cuts metal is not completely fixed in composition, the total amount passing through the valve body is different from the calculation method.

[0006] 2. A cutting fluid pattern adjustment component is designed to be installed on the valve body flow channel. This means that a component for forced fluid pattern adjustment (such as...) is installed in the inlet channel of a portion of the valve body (bypass channel). Figure 3 This component can adjust the fluid to a fluid configuration that facilitates cutting metal (e.g., ...). Figure 4 Its design objectives include, but are not limited to: (1) facilitating accurate calculation of fluid cutting rate; and (2) adjusting the overall flow rate of the entire valve body.

[0007] Currently, there are no similar products or designs in the fields of industrial fluid control, oil development and extraction, and well completion. The beneficial effects of this valve design and application are: enabling precise quantitative development and extraction of oil and water wells in oilfields; achieving precise oil-water identification in horizontal wells; inhibiting the continuous development of high water-cut production profiles and the formation of bottom water cones in horizontal wells; maintaining long-term, low water-cut production targets in horizontal wells; and improving the overall oil recovery rate of reservoirs.

[0008] Of course, those skilled in the art can easily understand the unique design of this valve through the above illustrative description and graphic illustrations, and can make modifications, substitutions, variations, etc., to replace the core design of this invention. The spirit and scope of this invention are separately defined based on the claims and their equivalents. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the cut-off valve component according to an embodiment of the present invention (the middle drum is designed as a fluid cutting part). Figure 2 This is a schematic diagram of a symmetrical flow channel according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a structure for forced adjustment of fluid morphology according to an embodiment of the present invention; Figure 4 This is a schematic diagram of fluid cutting (vertical view) according to an embodiment of the present invention. Figure 5 This is a partial view of the connection of the shut-off valve control component according to an embodiment of the present invention. Detailed Implementation

[0010] This invention discloses a method for designing a shut-off valve based on fluid cutting volume estimation, which is an industrial fluid control shut-off valve product. It can be installed on oilfield completion screens to achieve quantitative calculation of oil and gas extraction per unit length. To help those skilled in the art better understand its application in oilfields, the main design steps for using this valve during oilfield drilling and completion are briefly described below.

[0011] Main design steps: After well drilling and completion, reservoir engineers assess the recoverable reserves of the well's segmented production profiles based on logging information. They then estimate the production rate per unit length of the production profile, determine the sand control and water control accuracy of individual screens, and the overall radial flow rate of a single screen. Finally, completion engineers design the total number of valves required radially in the production wellbore and complete other auxiliary screen designs. Other key production steps include the following: 1. Approximately 100 liters of oil and water samples were taken from the production formation of the target oil well to determine its composition, including mineralization, pH, and solid particle composition.

[0012] 2. Pour the oil and water fluid samples into the professional fluid cutting test equipment system, start and conduct the fluid cutting test for 50 hours.

[0013] 3. Remove the metal part from the fluid cutting test and measure the change in the cutting effect of a specific fluid component on a specific metal.

[0014] 4. Based on the fluid cutting change obtained in step (3), the total flow of the target fluid in a single valve body is calculated using calculation software and database data.

[0015] 5. Based on the total flow of the individual valve obtained in step (4), design the total number of valves to be installed on a single screen pipe and the mining and development time.

[0016] 6. After completing the above steps, install the valve body on the screen pipe base according to the development and mining requirements, and then improve the filtration, tracing and other indicators of the screen pipe.

[0017] 7. Finally, complete the relevant operations for oil screen completion according to the completion methods and procedures for flow control screens.

[0018] The present invention has been described above by way of example. It should be noted that the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many specific modifications under the guidance of the present invention without departing from the essential mechanism of the core components used in the present invention and the scope of protection of the claims. These modifications are all within the scope of protection of the present invention.

Claims

1. A method for estimating the total flow rate of a shut-off valve based on fluid cutting, characterized in that, This includes design methods for estimating the total flow through the valve body using the cutting rate of fluid on metals or non-metals, and designs for installing cutting fluid profile adjustment components within the valve body control flow channel.

2. The method for estimating the total flow of a shut-off valve based on fluid cutting as described in claim 1, characterized in that, The design method for estimating the total flow through the valve body using the cutting rate of fluid on metals or non-metals includes the following steps: Under the condition of flow velocity v, the cutting rate Vc of the metal is obtained by using the target fluid, and the effective cutting change L of the control rod for closing the shut-off valve is designed. Then, the working time of the fluid cutting part is designed: T=L / Vc; the total flow of the valve can be calculated by the formula for calculating the total fluid volume of the valve: Q=S×v×T. Where Q is the total flow rate, S is the total flow area, and v is the average velocity of all fluids.

3. The method for estimating the total flow of a shut-off valve based on fluid cutting as described in claim 2, characterized in that, The cutting variation L is the working dimension of the shut-off valve control component that is being cut, and the shape of the component being cut is not limited.

4. The design of installing a cutting fluid pattern adjustment component within the valve body control flow channel as described in claim 1, characterized in that, The design includes a cutting fluid pattern adjustment component installed within the valve body control flow channel, used to adjust the fluid to a shape suitable for cutting the valve control components within the flow channel.

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