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CN-122014241-A - Online dissolved sulfur evaluation device and dissolved sulfur evaluation method

CN122014241ACN 122014241 ACN122014241 ACN 122014241ACN-122014241-A

Abstract

The invention discloses an online dissolved sulfur evaluation device and a dissolved sulfur evaluation method, and relates to the technical field of gas field development and evaluation. The on-line sulfur dissolving evaluation device comprises a sulfur dissolving reaction unit, a gas supply unit, a feeding unit, a liquid pumping unit and a circulating unit, wherein the sulfur dissolving reaction unit comprises a reaction cylinder, a heating part and a spiral flow passage part are arranged on the reaction cylinder, the gas supply unit is provided with a first pipeline, the circulating unit comprises a gas-liquid two-phase separator, the gas-liquid two-phase separator is provided with a recovery pipeline, a gas pipe and a liquid pipe, the first pipeline is provided with a first pressure gauge, and the recovery pipeline is provided with a second pressure gauge. The method for evaluating the dissolved sulfur comprises the steps of forming a sulfur deposition site, then introducing a sulfur dissolving agent, and finally evaluating the dissolved sulfur according to the pressure difference change condition. And the circulating unit is opened to collect the water sample, so as to obtain the amount of dissolved solids for sulfur dissolution evaluation. The on-line dissolved sulfur evaluation device and the dissolved sulfur evaluation method have the advantages of accurate environment simulation, good simulation effect reflecting the condition and accurate effect evaluation.

Inventors

  • JIANG FAN
  • LIU YUNFENG
  • LIU YOUQUAN
  • FU CHENG

Assignees

  • 中国石油天然气股份有限公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (10)

  1. 1. An online sulfur dissolving evaluation device is characterized by comprising a sulfur dissolving reaction unit (1), a gas supply unit (2), a feeding unit (3), a liquid pumping unit (4) and a circulating unit (5); the sulfur dissolving reaction unit (1) comprises a reaction cylinder (101), the reaction cylinder (101) is provided with a heating element (102) for heating the inside, the inside of the reaction cylinder (101) is provided with a plurality of spiral flow channel elements (103), The gas supply unit (2) is provided with a first pipeline (8) connected with a plurality of spiral flow channel members (103), the inlet and the outlet of the feeding unit (3) are connected with the first pipeline (8), the liquid pumping unit (4) is connected with the first pipeline (8), the circulation unit (5) comprises a gas-liquid two-phase separator (501), the inlet end of the gas-liquid two-phase separator (501) is provided with a recovery pipeline (503) connected with a plurality of spiral flow channel members (103), the outlet end of the gas-liquid two-phase separator (501) is provided with a gas pipe (504) connected with the gas supply unit (2) and a liquid pipe (502) connected with the liquid pumping unit (4), The first pipeline (8) is provided with a first pressure gauge (6), and the recovery pipeline (503) is provided with a second pressure gauge (7).
  2. 2. The online sulfur dissolution evaluation apparatus according to claim 1, wherein the gas supply unit (2) includes a gas source member (201) connected to the gas pipe (504), the gas source member (201) is connected to a gas control valve (202), the gas control valve (202) is connected to a gas booster (203), and the gas booster (203) is connected to an inlet of the first pipe (8).
  3. 3. The online sulfur dissolution evaluation apparatus according to claim 2, wherein the inlet of the charging unit (3) is provided with a valve one (301).
  4. 4. The online sulfur dissolution evaluation apparatus according to claim 1, wherein the liquid pumping unit (4) comprises a liquid pump (401) connected with the liquid pipe (502), the liquid pump (401) is connected with a first liquid tank (402) and a second liquid tank (403), the liquid pump (401) is connected with the first pipeline (8), and a second valve (404) is arranged at an outlet of the liquid pump (401).
  5. 5. The online sulfur dissolution evaluation apparatus according to claim 4, wherein the first pipe (8) is provided with a valve three (801), the valve three (801) is located downstream of the inlet connection of the charging unit (3), and the valve three (801) is located upstream of the outlet connection of the liquid pump (401).
  6. 6. The online sulfur dissolution evaluation apparatus according to claim 1, wherein the first pipe (8) is provided with a four-way joint with the spiral flow path member (103), and the recovery pipe (503) is provided with a four-way joint with the spiral flow path member (103).
  7. 7. The online sulfur dissolution evaluation apparatus according to claim 1, wherein the recovery pipe (503) is provided with a valve four (506), the valve four (506) being located on the downstream side of the pressure gauge two (7).
  8. 8. The online sulfur dissolution evaluation apparatus according to claim 1, wherein the heating member (102) is configured as an annular heating member 102 surrounding the spiral flow path member (103), and the annular heating member 102 is electrically connected with a temperature controller (104).
  9. 9. The online sulfur dissolution evaluation apparatus according to claim 1, wherein the liquid pipe (502) is connected with a steady flow storage tank (505).
  10. 10. A method for evaluating sulfur dissolution, characterized by using the on-line sulfur dissolution evaluating apparatus as defined in claim 1, further comprising the steps of, The gas supply unit (2) is communicated with the feeding unit (3) to close the inlet of the circulating unit (5), and the gas supplied by the gas supply unit (2) flows through the feeding unit (3) to purge the solid powder in the feeding unit (3) into the spiral flow channel piece (103) of the reaction cylinder (101) and then close the gas supply unit (2); opening the heating member (102) to adjust the temperature in the reaction cylinder (101) to a predetermined value and heating for a predetermined time; then the inlet of the feeding unit (3) is closed, and the inlet of the circulating unit (5) is opened, and the gas-liquid two-phase separator (501) starts to work; The method comprises the steps of opening a liquid pumping unit (4) to add liquid in a first liquid tank (402) into a first pipeline (8), forming a gas-liquid mixed fluid by the liquid along with gas, recording a first pressure gauge (6) and a second pressure gauge (7), and obtaining a differential pressure delta 1 before and after a sulfur-dissolving reaction unit (1); The method comprises the steps of opening a liquid pumping unit (4) to add liquid in a liquid tank II (403) into a first pipeline (8), forming a gas-liquid mixed fluid by the liquid along with gas, recording a pressure gauge I (6) and a pressure gauge II (7) after a sulfur dissolving process, and obtaining a differential pressure value delta 2 before and after a sulfur dissolving reaction unit (1); The pressure difference change after reaction x= (Δ 1 -Δ 2 )/Δ 1 ; After the liquid pumping unit (4) is closed, the gas supply unit (2) blows liquid in the circulation flow to the circulation unit (5), and then the gas supply unit (2) is closed, the circulation unit (5) is opened to collect a water sample; and finally, determining an online sulfur dissolving evaluation effect according to the values of X and Y, wherein the closer the value of X is to 1, the larger the value of Y is, and the better the sulfur dissolving effect is.

Description

Online dissolved sulfur evaluation device and dissolved sulfur evaluation method Technical Field The invention relates to the technical field of gas field development evaluation, in particular to an online sulfur dissolution evaluation device and a sulfur dissolution evaluation method. Background According to the development experience of high sulfur-containing gas fields at home and abroad, the temperature and pressure of natural gas from stratum to shaft to wellhead are inevitably reduced along with the exploitation process, the solubility of corresponding elemental sulfur in the natural gas is reduced, when the sulfur content in the high sulfur-containing gas reaches saturation, sulfur crystals are separated out, elemental sulfur is easy to deposit in a production layer, shaft and gathering and transporting system to cause sulfur blockage, the yield of the gas well is directly influenced, and even the gas well is stopped. In view of the above, a common method for solving the problem of clogging due to sulfur deposition is a sulfur-dissolving agent dissolution method, and a sulfur-dissolving evaluation method is related to the selection of a sulfur-dissolving method or a sulfur-dissolving agent. The existing sulfur dissolution evaluation device is not suitable for online sulfur dissolution evaluation, for example, CN 106706465B discloses a sulfur dissolution agent evaluation device and a using method thereof, and the device simulates the gas environment and the pressure environment in the bottom of a gas production well and a production collection pipeline, but has the following problems: (1) The sulfur deposition position, the sulfur deposition consolidation degree, the pipe column environment and the like in the well bore or in the online filling process of the gathering and transporting system cannot be accurately simulated; (2) The contact reaction condition of the sulfur dissolving agent and the deposited sulfur cannot be simulated; (3) After the reaction is finished, the process and the steps for calculating the sulfur powder dissolution before and after the reaction by using a differential method are complex, errors are easy to increase, and the effect evaluation is carried out on the site of the online sulfur dissolution filling process by using the differential method. Accordingly, the prior art is in need of improvement. Disclosure of Invention The invention aims to solve the technical problems of inaccurate environment simulation, poor simulation effect reflecting the situation and large effect evaluation error, and provides an online sulfur dissolving evaluation device and a sulfur dissolving evaluation method. The invention is realized by the following technical scheme: In a first aspect, the invention provides an online dissolved sulfur evaluation device, which comprises a dissolved sulfur reaction unit, a gas supply unit, a charging unit, a liquid pumping unit and a circulating unit; the sulfur dissolving reaction unit comprises a reaction cylinder, the reaction cylinder is provided with a heating element for heating the inside, the inside of the reaction cylinder is provided with a plurality of spiral flow channel elements, The gas supply unit is provided with a first pipeline connected with a plurality of spiral flow channel pieces, the inlet and the outlet of the feeding unit are connected with the first pipeline, the liquid pumping unit is connected with the first pipeline, the circulation unit comprises a gas-liquid two-phase separator, the inlet end of the gas-liquid two-phase separator is provided with a recovery pipeline connected with the spiral flow channel pieces, the outlet end of the gas-liquid two-phase separator is provided with a gas pipe connected with the gas supply unit and a liquid pipe connected with the liquid pumping unit, The first pipeline is provided with a first pressure gauge, and the recovery pipeline is provided with a second pressure gauge. Further, in the present invention, the gas supply unit includes a gas source member connected to the gas pipe, and the gas source member is connected to a gas control valve, and the gas control valve is connected to a gas booster, and the gas booster is connected to an inlet of the first pipe. Further, in the present invention, the inlet of the charging unit is provided with a valve I. Further, in the present invention, the liquid pumping unit includes a liquid pump connected to the liquid pipe, the liquid pump is connected to a first liquid tank and a second liquid tank, the liquid pump is connected to the first pipe, and a second valve is disposed at an outlet of the liquid pump. Further, in the present invention, the first pipe is provided with a valve three, the valve three is located downstream of the inlet connection of the charging unit, and the valve three is located upstream of the outlet connection of the liquid pump. Further, in the present invention, the first pipe is provided with a four-way joint to the spiral