Intelligent well completion flow simulation method based on point-bridge topological structure

Abstract

The invention discloses an intelligent well completion flow simulation method based on a point-bridge topological structure. The method comprises the steps that 1, basic information related to well completion and an oil reservoir is collected; 2, drawing a well completion structure schematic diagram; 3, grid segmentation is conducted according to the well completion schematic diagram; 4, selectinga grid center in each section of each layer as an axial grid calculation point; 5, if flow exists between the adjacent grid calculation points in the axial direction and the radial direction, connecting the adjacent grid calculation points through straight lines, and establishing a point-bridge topological structure chart of intelligent well completion; 6, according to the established point-bridge topological structure, pressure and flow distribution in each layer of annulus are calculated, and flow and pressure distribution calculation formulas in the tubular column are Bernoulli equations;the five-layer flowing annular tubular column for intelligent well completion is characterized on the basis of a point-bridge topological structure, different environment controls and different flowing rules in the tubular column are fully considered, flow and pressure changes are accurately calculated, and therefore accurate simulation and calculation of underground flowing of intelligent well completion are achieved.

Description

technical field [0001] The invention relates to an intelligent well completion method in the field of petroleum and natural gas development, in particular to an intelligent well completion flow simulation method based on a point-bridge topology. Background technique [0002] Well completion refers to the method of establishing a communication channel between the wellbore and the reservoir after the wellbore is drilled. The communication channels established by traditional well completion methods such as perforation completion cannot realize post-control. Intelligent well completion refers to the well completion method with downhole data monitoring and flow control system, through data monitoring and flow control to realize the optimization of development, so as to achieve intelligence. One of the core systems of intelligent well completion is the downhole flow control system, including tools and equipment such as power transmission, signal analysis and transmission, downhol...

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Problems solved by technology

[0003] The main problems are (1) In terms of intelligent well completion equipment and tools, although localization has been initially realized, the intelligence of well completion is realized through precise simulation and control of flow, and core technologies such as simulation methods and control schemes still need breakthroughs (2) In the reservoir, intelligent well completion has at most five layers of flow annulus: tubing, center pipe (or liner), sand control screen layer, flow control layer (ICD or ICV, etc.), completion (jet pore, etc.) layer, near wellbore reservoir

The flow laws in the five-layer ring control string are different, and the radial flow and axial flow exist simultaneously, which makes the pressure distribution and flow change rules more complicated. The conventional completion flow rules and productivity calculation methods have many assumptions and large errors. Large, unable to meet the calculation requirements of intelligent well completion

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