Suspension stability testing device and testing method

Abstract

The invention relates to a suspension stability testing device and testing method used for testing suspension stability of high-density working solution solid phase granules under high temperature and high pressure. According to the invention, the suspension stability of a high-density working solution at a shaft bottom can be accurately evaluated, which provides scientific experiment references for well drilling operation. The device has the technical scheme that an O-shaped sealing ring of a container is arranged in a groove of an upper end surface of the high temperature and high pressure resistant container, the top end of an upper cover of the container is provided with an upper part needle type stop valve, and the stop valve is connected with a constant-pressure constant-speed pump; the container is wrapped with a heating sleeve outside, a side wall of the container is provided with a temperature sensor and 11 pressure transmitters distributed equidistantly and is connected with a computer; the lower part of the container is sealed with a lower cover of the container and the O-shaped sealing ring, and the lower cover of the container is provided with a lower part needle type stop valve;the container is divided into two sealed cabins by the O-shaped sealing ring; and a U-shaped base is connected with the container through a rotary shaft, and the front end of the rotary shaft is provided with a brake switch. The device can be used for accurately testing the suspension stability of the high-density working solution under a high-temperature and high-pressure environment.

Description

technical field [0001] The invention relates to a suspension stability test device and a test method for testing the suspension stability performance of high-density working liquid solid phase particles under high temperature and high pressure. Background technique [0002] With the development of my country's petroleum industry, there are more and more high-pressure and ultra-high-pressure oil and gas wells. When drilling high-pressure oil and gas wells or ultra-deep wells, special weighting agents are usually used to increase the proportion of mud to balance the formation pressure. The suspending effect of the mud on the weighting agent is a major problem in the use of the weighted mud. According to the principle that the liquid column pressure of the mud will change when the weighting agent settles in the mud, the working fluid is suspended during the drilling and completion process. Stability and settlement stability directly affect construction progress: in the process of...

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Problems solved by technology

[0002] With the development of my country's petroleum industry, there are more and more high-pressure and ultra-high-pressure oil and gas wells. When drilling high-pressure oil and gas wells or ultra-deep wells, special weighting agents are usually used to increase the proportion of mud to balance the formation pressure. The suspending effect of the mud on the weighting agent is a major problem in the use of the weighted mud. According to the principle that the liquid column pressure of the mud will change when the weighting agent settles in the mud, the working fluid is suspended during the drilling and completion process. Stability and settlement stability directly affect construction progress: in the process of tripping and stopping for maintenance, if the suspension stability and settlement stability are poor, it will lead to difficulties in tripping and pumping; During operation), the working fluid is under the harsh conditions of high temperature and high pressure for a long time (half a month or even more than a month). If the suspension stability and settlement stability are poor, it will make it difficult to lower the tool or even affect the oil testing operation. At present, domestic and foreign evaluations are aggravated There are two main types of mud settlement stability: direct observation method and upper and lower density difference method

The direct observation method is to pour a certain volume of weighted mud into the transparent container of the instrument, and observe whether the mud will be significantly stratified after a period of time; the upper and lower density difference method is to stir the drilling fluid before high temperature, pour it into a 500ml measuring cylinder to the full scale and let it stand After 48 hours, take 2 / 5 of the drilling fluid, use a density scale to measure the density of the upper drilling fluid, take 4 / 5 of the drilling fluid, and use a density scale to measure the density of the lower drilling fluid, if the difference between the upper and lower drilling fluid densities is ≤0.02g / cm 3 , indicating that the drilling fluid system has good settlement stability and good suspension stability. However, both methods have certain limitations: 1. Measurements cannot be performed under high temperature and high pressure; 2. The observation method cannot be quantitatively carried out 3. The method of using the density difference between the upper and lower layers cannot accurately reflect the suspension stability of each layer, and when the drilling fluid is extracted, it will disturb the static solution, making the density measurement inaccurate. In order to accurately evaluate the high-density drilling, Suspension stability (anti-settling ability) of completion fluid under high temperature and high pressure environment, providing scientific experimental data for drilling operations in deep and ultra-deep wells. There is an urgent need for a test device that can measure the suspension stability of drilling and completion fluids under high temperature and high pressure.

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