Evaluation device and evaluation method for simulating damage of cementing slurry to reservoirs

Abstract

The invention discloses an evaluation device and an evaluation method for simulating damage of cementing slurry to reservoirs. The device mainly comprises an upper kettle 15, a lower kettle 21, a middle component 19, a core clamp 20, a variable frequency motor 11, an upper kettle high-pressure pump 32, a confining pressure pump 29, a lower kettle high-pressure pump 28, a central processing system 33, a data display system 34, a formation water middle container 9, a working solution middle container group, a waste liquid collecting kettle 6, a liquid collecting tank 24, a kettle heating and cooling system 16, an upper kettle temperature sensor 30, a lower kettle temperature sensor 26, an upper kettle pressure sensor 31 and a lower kettle pressure sensor 27. The device simulates damage of various working solutions to the reservoirs under complicated working conditions such as different temperature, pressure and loss in the drilling and completion process, and a cement slurry system matched with underground environments and other working solutions is optimally selected. According to the device, cementing quality can be effectively improved, and high-efficient mining of oil and gas wells is achieved.

Description

technical field [0001] The invention relates to an evaluation device and evaluation method for simulating the damage of cement slurry to reservoirs, which can simulate complex working conditions such as downhole temperature, pressure, and pressure difference, and can simulate the damage of working fluid to reservoirs under different working conditions. Evaluate the damage situation, and optimize the cementing slurry system that matches the downhole environment, so as to improve the cementing quality. Background technique [0002] Reservoir protection and damage prevention are important tasks in the exploration and development of oil and gas wells. During the cementing process, the reservoir will be damaged by cement slurry and other working fluids. Once the damage is formed, it will affect the quality of cementing and the productivity of oil and gas wells. The incompatible cement slurry system and its filtrate and solid particles will damage the reservoir during the cementi...

AI Technical Summary

Problems solved by technology

[0003] At present, there are few domestic studies on the damage of cement slurry to the reservoir, and the existing core damage evaluation device only considers the damage of a single working fluid to the reservoir, and there is no device that can evaluate the damage of multiple working fluids to the core during the entire drilling and completion process. dynamic injury process

The existing evaluation device still has the following shortcomings: (1) It cannot simulate the damage to the core during the circulation process of various working fluids in the process of drilling and completion, and only does a single fluid damage analysis; (2) It cannot simulate the formation and dynamic change process of mud cake (3) The formation environment simulation is inaccurate, the wellbore pressure and formation pressure cannot truly reflect the downhole conditions, and often only the pressure difference between the two is considered; (4) The real-time monitoring of data is not accurate

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