High-precision visual testing device and method for influence factors of wellbore sulfur precipitation

Abstract

The invention discloses a high-precision visual testing device and method for the influence factors of wellbore sulfur precipitation. The high-precision visual testing device comprises a supply system, a wellbore condition simulation system, a magnetic suspension balance measuring system, a visual data collecting system and a tail gas treatment system. The high-precision visual testing device andmethod have the beneficial effects that the device can truly simulate any types of wellbores, the temperature and pressure of any positions and different phase states of sulfur, the sulfur precipitation influence factors can be measured and analyzed qualitatively by changing temperatures, pressure, precipitation time, hole deviation angles, the content of hydrogen sulfide and the content of water,the testing precision of sulfur precipitation quantity and precipitation speed can be greatly improved, and the precipitation dynamic condition and the sedimentation dynamic condition of sulfur in awellbore are observed through high-power microscope in real time; and when sulfur elements suspend in the wellbore, the critical suspended velocity and the minimum sulfur carrying gas production rateof the sulfur under different states can be calculated. The high-precision visual testing device and method have the advantages of good safety, high measuring precision, high temperature and pressureresistance, high corrosion resistance and the like, thereby having very important significance to research of high sulfur content gas wellbore sulfur precipitation laws.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploitation, in particular to a high-precision wellbore sulfur deposition influencing factor visualization testing device and method. Background technique [0002] my country is rich in high-sulfur gas reservoir resources, for example, the Zhaolanzhuang gas field in North China in the continental strata of the Bohai Bay Basin, the Luojia gas field in the Shengli Oilfield, the Feixianguan Formation gas reservoir in the Dukouhe gas field in the marine strata of the Sichuan Basin, and the Feixian gas field in the Luojiazhai gas field. Guan Formation Gas Pool, Puguang Gas Field Feixianguan Formation Gas Pool, Tieshanpo Gas Field Feixianguan Formation Gas Pool, Longmen Gas Field Feixianguan Formation Gas Pool, Gaofengchang Gas Field Feixianguan Formation Gas Pool, Zhongba Gas Field Leikoupo Formation Gas Pool The gas reservoir and the Jialingjiang Formation gas reservoir in the Wolonghe gas fi...

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Problems solved by technology

[0004] However, at present, the quantitative measurement of sulfur deposition in wellbore is still in a blank stage. The existing indoor experimental conditions are quite different from the real wellbore flow conditions. Generally, the fluid flow in deviated wells and horizontal wells cannot be simulated. The influence of phase sulfur is also lack of consideration, and the measurement accuracy of the existing equipment is insufficient, the measurement error is large, or the amount of sulfur deposition cannot be measured at all, and the critical suspension velocity and minimum sulfur-carrying gas volume of sulfur particles or sulfur droplets in the wellbore cannot be measured. , at the same time, it is impossible to visually observe the precipitation and deposition dynamics of sulfur in the wellbore

In summary, the existing experimental testing systems and methods cannot measure the amount of sulfur deposition, deposition velocity, critical suspension velocity, and minimum sulfur-carrying gas in the wellbore accurately and dynamically in real time, nor can they directly observe the precipitation and deposition form of sulfur to obtain the sulfur content in the wellbore. deposition law

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