RU98120089A - METHOD FOR DETERMINING THE SIZES AND CONFIGURATION OF THE THRESHOLD ZONE FOR THREATING OF MULTI-FROZEN BREEDS IN THE PRESTIGEOUS WELL ZONE - Google Patents
METHOD FOR DETERMINING THE SIZES AND CONFIGURATION OF THE THRESHOLD ZONE FOR THREATING OF MULTI-FROZEN BREEDS IN THE PRESTIGEOUS WELL ZONEInfo
- Publication number
- RU98120089A RU98120089A RU98120089/03A RU98120089A RU98120089A RU 98120089 A RU98120089 A RU 98120089A RU 98120089/03 A RU98120089/03 A RU 98120089/03A RU 98120089 A RU98120089 A RU 98120089A RU 98120089 A RU98120089 A RU 98120089A
- Authority
- RU
- Russia
- Prior art keywords
- soil
- time
- zone
- thawed
- rocks
- Prior art date
Links
- 239000002689 soil Substances 0.000 claims 8
- 239000011435 rock Substances 0.000 claims 5
- 238000010257 thawing Methods 0.000 claims 5
- 238000005056 compaction Methods 0.000 claims 2
- 238000001914 filtration Methods 0.000 claims 2
- 210000002356 Skeleton Anatomy 0.000 claims 1
- 230000001133 acceleration Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 claims 1
- 230000005484 gravity Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 238000001556 precipitation Methods 0.000 claims 1
- 239000000725 suspension Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
Claims (2)
где Т - температура, r - радиальная координата, z - продольная координата, ρ - плотность, C - удельная теплоемкость пород, λ - коэффициент теплопроводности пород, τ - время,
рассчитывают величину осадки оттаявших пород в приустьевой зоне скважины по формулам
ΔS = AH+Sτ (2),
где ΔS суммарная величина осадки оттаявших пород, А - коэффициент оттаивания, Н - мощность оттаявших слоев, Sτ - осадка уплотнения под действием собственного веса к моменту передачи на основание полезной нагрузки,
Sτ= Sст·Uz, (3),
где Uz - степень фильтрационной консолидации грунта при оттоке влаги в вертикальном направлении, Sст. - величина стабилизированной осадки уплотнения оттаявшего массива грунта под действием собственного веса,
Sст= 0,5acgγвзвH2 (4),
где аc - коэффициент сжимаемости оттаявшего грунта, g - ускорение силы тяжести, γвзв - плотность грунта во взвешенном состоянии,
γвзв= γc(γs-γв)/γs (5),
где γs - плотность частиц скелета грунта, γc - плотность сухого грунта, γв - плотность воды,
Uz= 1-8γπ-2e-Nb, (6)
где Nb - коэффициент, вычисляемый по формуле
Nb= 0,25πCυτ/H2 (7),
где τ - время, отсчитываемое от окончания оттаивания, Cυ - коэффициент консолидации, вычисляемый по формуле:
Cυ= Kф/acgγвзв, (8),
где Кф - коэффициент фильтрации оттаявшего грунта,
определяют радиус на различных глубинах и строят масштабный профиль сформировавшейся термокарстовой воронки, затем изменяют соответственно (2) конфигурацию расчетной области и повторяют вышеописанные операции для следующего годового цикла, при этом циклы расчетов повторяют до достижения заданного момента времени.1. A method for determining the dimensions and configuration of the thawing zone of permafrost in the wellhead zone, including standard thermophysical studies of soil properties and thermometric measurements, characterized in that, based on the obtained initial parameters, the unsteady heat equation (1) is solved by the finite difference method based on mathematical modeling for the period of time from the start of the well to the end of the summer thawing season
where T is the temperature, r is the radial coordinate, z is the longitudinal coordinate, ρ is the density, C is the specific heat of the rocks, λ is the thermal conductivity of the rocks, τ is the time,
calculate the amount of sediment thawed rocks in the estuary zone of the well according to the formulas
ΔS = AH + S τ (2),
where ΔS is the total precipitation of thawed rocks, A is the thawing coefficient, N is the power of thawed layers, S τ is the compaction sediment under its own weight at the time of transfer to the payload base,
S τ = S Art · U z , (3),
where U z - the degree of filtration consolidation of the soil during the outflow of moisture in the vertical direction, S Art. - the value of the stabilized sediment compaction of the thawed soil mass under the action of its own weight,
S article = 0,5a c gγ plow H 2 (4),
where a c is the compressibility coefficient of thawed soil, g is the acceleration of gravity, γ cw is the density of the soil in suspension,
γ vzv = γ c (γ s -γ c ) / γ s (5),
where γ s is the density of particles of the skeleton of the soil, γ c is the density of dry soil, γ in is the density of water,
U z = 1-8γπ -2 e -Nb , (6)
where N b is the coefficient calculated by the formula
N b = 0.25πC υ τ / H 2 (7),
where τ is the time measured from the end of thawing, C υ is the consolidation coefficient calculated by the formula:
C υ = K f / a c gγ arr. , (8),
where K f - the filtration coefficient of thawed soil,
determine the radius at various depths and build a scale profile of the formed thermokarst funnel, then, respectively, change (2) the configuration of the computational domain and repeat the above operations for the next annual cycle, while the calculation cycles are repeated until a specified point in time is reached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU98120089A RU2157882C2 (en) | 1998-11-02 | 1998-11-02 | Method of determination of sizes and configuration of thawed zone of permafrost rocks in wellhead zone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU98120089A RU2157882C2 (en) | 1998-11-02 | 1998-11-02 | Method of determination of sizes and configuration of thawed zone of permafrost rocks in wellhead zone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| RU98120089A true RU98120089A (en) | 2000-09-10 |
| RU2157882C2 RU2157882C2 (en) | 2000-10-20 |
Family
ID=20212034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| RU98120089A RU2157882C2 (en) | 1998-11-02 | 1998-11-02 | Method of determination of sizes and configuration of thawed zone of permafrost rocks in wellhead zone |
Country Status (1)
| Country | Link |
|---|---|
| RU (1) | RU2157882C2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2526435C1 (en) * | 2013-04-23 | 2014-08-20 | Общество с ограниченной ответственностью "Научно-исследовательский институт природных газов и газовых технологий-Газпром ВНИИГАЗ" | Monitoring of wells thermal interaction with permafrost strata |
| CN107356726B (en) * | 2017-08-22 | 2023-05-12 | 中国科学院西北生态环境资源研究院 | Indoor simulation system for permafrost degradation process |
| RU2754094C1 (en) * | 2020-12-29 | 2021-08-26 | Акционерное общество "Научно-исследовательский центр "Строительство", АО "НИЦ "Строительство" | Device for determining thawing coefficient of permafrost soil |
| CN115114709B (en) * | 2022-06-13 | 2024-04-19 | 安徽理工大学 | Prediction method for three-dimensional thawing deformation of subway tunnel freezing method construction stratum |
-
1998
- 1998-11-02 RU RU98120089A patent/RU2157882C2/en not_active IP Right Cessation
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