Study on Wellbore Temperature and Pressure Distribution in Process of Gas Hydrate Mined by Polymer Additive CO2 Jet
In order to solve the problem of hydrate reservoir collapse and hydrate regenerated in the process of solid fluidization of natural gas hydrate, a new method of natural gas hydrate exploit by high‐polymer additive (low viscosity carboxymethyl cellulose LV‐CMC) carbon dioxide jet was proposed. The we...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2020-01-01
|
| Series: | Advances in Polymer Technology |
| Online Access: | http://dx.doi.org/10.1155/2020/2914375 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850110462603034624 |
|---|---|
| author | Minghui Wei Chenghuai Wu Yanxi Zhou |
| author_facet | Minghui Wei Chenghuai Wu Yanxi Zhou |
| author_sort | Minghui Wei |
| collection | DOAJ |
| description | In order to solve the problem of hydrate reservoir collapse and hydrate regenerated in the process of solid fluidization of natural gas hydrate, a new method of natural gas hydrate exploit by high‐polymer additive (low viscosity carboxymethyl cellulose LV‐CMC) carbon dioxide jet was proposed. The wellbore temperature and pressure changes during this process are analyzed, and the wellbore temperature and pressure model are established and solved by the state space method. This paper also analyzed the effects of relevant parameters on hydrate decomposition, such as injection flow, temperature, and pressure. The results show that increasing the injection pressure allows the hydrate decomposition site to be closer to the annulus outlet. Compared with water, with polymer additive CO2 fluid as the drilling fluid, the intersection point of phase equilibrium curve and annular pressure curve is closer to annular outlet, which is obviously more conducive to well control. In order to avoid phase changes, the injection pressure of the carbon dioxide fluid of the high‐polymer additive should not be lower than 10 MPa, and the injection temperature should not be higher than 285 K. |
| format | Article |
| id | doaj-art-467d41285f80406f82ead865b58cbb7f |
| institution | OA Journals |
| issn | 0730-6679 1098-2329 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Polymer Technology |
| spelling | doaj-art-467d41285f80406f82ead865b58cbb7f2025-08-20T02:37:49ZengWileyAdvances in Polymer Technology0730-66791098-23292020-01-01202010.1155/2020/29143752914375Study on Wellbore Temperature and Pressure Distribution in Process of Gas Hydrate Mined by Polymer Additive CO2 JetMinghui Wei0Chenghuai Wu1Yanxi Zhou2College of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu, ChinaCollege of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu, ChinaCollege of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu, ChinaIn order to solve the problem of hydrate reservoir collapse and hydrate regenerated in the process of solid fluidization of natural gas hydrate, a new method of natural gas hydrate exploit by high‐polymer additive (low viscosity carboxymethyl cellulose LV‐CMC) carbon dioxide jet was proposed. The wellbore temperature and pressure changes during this process are analyzed, and the wellbore temperature and pressure model are established and solved by the state space method. This paper also analyzed the effects of relevant parameters on hydrate decomposition, such as injection flow, temperature, and pressure. The results show that increasing the injection pressure allows the hydrate decomposition site to be closer to the annulus outlet. Compared with water, with polymer additive CO2 fluid as the drilling fluid, the intersection point of phase equilibrium curve and annular pressure curve is closer to annular outlet, which is obviously more conducive to well control. In order to avoid phase changes, the injection pressure of the carbon dioxide fluid of the high‐polymer additive should not be lower than 10 MPa, and the injection temperature should not be higher than 285 K.http://dx.doi.org/10.1155/2020/2914375 |
| spellingShingle | Minghui Wei Chenghuai Wu Yanxi Zhou Study on Wellbore Temperature and Pressure Distribution in Process of Gas Hydrate Mined by Polymer Additive CO2 Jet Advances in Polymer Technology |
| title | Study on Wellbore Temperature and Pressure Distribution in Process of Gas Hydrate Mined by Polymer Additive CO2 Jet |
| title_full | Study on Wellbore Temperature and Pressure Distribution in Process of Gas Hydrate Mined by Polymer Additive CO2 Jet |
| title_fullStr | Study on Wellbore Temperature and Pressure Distribution in Process of Gas Hydrate Mined by Polymer Additive CO2 Jet |
| title_full_unstemmed | Study on Wellbore Temperature and Pressure Distribution in Process of Gas Hydrate Mined by Polymer Additive CO2 Jet |
| title_short | Study on Wellbore Temperature and Pressure Distribution in Process of Gas Hydrate Mined by Polymer Additive CO2 Jet |
| title_sort | study on wellbore temperature and pressure distribution in process of gas hydrate mined by polymer additive co2 jet |
| url | http://dx.doi.org/10.1155/2020/2914375 |
| work_keys_str_mv | AT minghuiwei studyonwellboretemperatureandpressuredistributioninprocessofgashydrateminedbypolymeradditiveco2jet AT chenghuaiwu studyonwellboretemperatureandpressuredistributioninprocessofgashydrateminedbypolymeradditiveco2jet AT yanxizhou studyonwellboretemperatureandpressuredistributioninprocessofgashydrateminedbypolymeradditiveco2jet |