Test device capable of simulating plugging of high temperature and high pressure dropping strata

Abstract

The invention relates to a test device capable of simulating plugging of high temperature and high pressure dropping strata, which is mainly composed of a gas source, an oil tank, an upper kettle body, a lower kettle body, a water source, a magnetic force driver, a central processing system and a liquid collecting tank. The upper kettle body is connected with the oil tank and the gas source, the lower kettle body is connected with the water source, the upper kettle body and the lower kettle body are not only respectively connected with a pressure pump and a pressure-release pump, but also respectively connected with a pressure sensor and a thermalcouple, and the pressure sensor and the thermalcouple are connected with the central processing system. A blade is arranged in the upper kettle body, a blade rotary shaft is driven by a frequency converting motor to rotate through the magnetic force driver, and a simulation rock core is arranged in the lower kettle body and connected with theliquid collecting tank. The test device capable of simulating plugging of high temperature and high pressure dropping strata can simulate complex working conditions of drilling working liquid under stratum conditions with different well depth, temperature, pressure and dropping types, slurry body flow states, differential pressure under high temperature and high pressure between a shaft and the stratum and the like, can test relevant parameters of plugging to determine dropping plugging effects so as to preferably select a drilling working liquid system.

Description

Technical field [0001] The invention relates to an evaluation instrument capable of better real-time simulation of the whole process of the dynamic flow of the drilling and completion working fluid in the wellbore to the leaky layer and dynamic plugging. Through the test and evaluation of the plugging effect under complex working conditions such as temperature, pressure, leakage channel and other formation conditions of different well depths, flow state, pressure difference, etc., the plugging material and corresponding plugging slurry system that match the leakage environment are selected It realizes the simulation of the leakage environment and the test of the plugging effect in the process of drilling, cementing, well completion, workover, cement plugging, cement extrusion and other operations of oil and natural gas exploration and development, where the wellbore and formation are under high pressure. Background technique [0002] During the drilling, completion and follo...

AI Technical Summary

Problems solved by technology

Domestic and foreign laboratories often use API indoor static plugging evaluation devices. One experiment requires as much as 4000ML of slurry. Normal temperature and nitrogen pressurization cannot effectively simulate the high-temperature and high-pressure formation environment of the formation. Thick slit plates do not have a high degree of stratum simulation; domestic related patents include utility model patents, such as the cement slurry plugging simulation test device (ZL200520119105.5), the slurry is static in the instrument, and the simulation does not get the change of the flow state. Embodied; a drilling plugging simulation test device (ZL200520070609.4), the lower filter screen of the same body has a greater impact on the plugging effect, causing simulation distortion; the drilling plugging simulation test device (ZL02243296.5), the instrument failed to The relevant parameters of the experiment are collected in real time, which is inconvenient for analysis after the experiment is over; the invention patent includes an intelligent high-temperature and high-pressure dynamic plugging evaluation experiment instrument (ZL200510019252.X). The process from no leakage to leakage in this device has not been completely simulated, and is Nitrogen pressurization does not reflect whether high pressure has an impact on plugging

The common shortcomings of these instruments: the leakage of the slurry is not reflected under the pressure difference between the two high-pressure systems, and if the wellbore pressure is lower than the pressure of the leaking layer in the continuation of the post-plugging operation, the plugging effect in the early stage will be affected. The influence of the plugging agent cannot be effectively evaluated, and the evaluation of the plugging effect due to the change of the physical and chemical properties of the plugging agent due to the change of the environment has not been reflected.

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