Dual activity off-shore drilling rig
US-2018135360-A1 · May 17, 2018 · US
Dynamic simulation method of circulating temperature variation in RMR subsea pump mud-lift drilling system
US11188694B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11188694-B2 |
| Application number | US-202117147418-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 12, 2021 |
| Priority date | Aug 6, 2020 |
| Publication date | Nov 30, 2021 |
| Grant date | Nov 30, 2021 |
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- Title
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Abstract
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The invention discloses a dynamic simulation method of circulating temperature variation in RMR subsea pump mud-lift drilling system, including steps: obtaining operating parameters, environmental parameters, well structure parameters and thermal parameters of target well; establishing temperature control equation of drill string in seawater section, temperature control equation of drill string in formation section, temperature control equation of annulus in formation section, and temperature control equation of return pipe in seawater section; re-determining initial and boundary conditions; discretizing spatial structure of the whole system with inner node method; discretizing control equations on corresponding nodes; substituting corresponding parameters into discrete expressions to obtain circulating temperature in drill string of seawater section, circulating temperature in drill string of formation section, circulating temperature in annulus of formation section, and circulating temperature in return pipe of seawater section. The dynamic analysis model established by the present invention is more suitable for actual operating conditions.
First claim
Opening claim text (preview).
What is claimed is: 1. A dynamic simulation method of circulating temperature variation in RMR subsea pump mud-lift drilling system, comprising the following steps: Step 1: obtaining operating parameters, environmental parameters, well structure parameters and thermal parameters of a target well; Step 2: respectively establishing a temperature control equation of drill string in seawater section, a temperature control equation of drill string in formation section, a temperature control equation of annulus in formation section, and a temperature control equation of return pipe in seawater section; wherein the temperature control equation of drill string in seawater section is: ρ m A pipe c m ∂ T ps ∂ t = - ρ m A pipe v pipe c m ∂ T ps ∂ t - 2 π R pi U ps ( T ps - T sea ) ; 1 U ps = 1 h pi + R pi R po h sea + R pi K pipe ln ( R po / R pi ) ; the temperature control equation of drill string in formation section is: ρ m A pipe c m ∂ T pf ∂ t = - ρ m A pipe v pipe c m ∂ T pf ∂ t + 2 π R pi U ap ( T ann - T pf
Assignees
Inventors
Classifications
Computer models or simulations, e.g. for reservoirs under production, drill bits · CPC title
- G06F30/28Primary
using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD] · CPC title
- E21B21/08Primary
Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure (valve arrangements therefor E21B21/10) · CPC title
- G06F17/11Primary
for solving equations {, e.g. nonlinear equations, general mathematical optimization problems (optimization specially adapted for a specific administrative, business or logistic context G06Q10/04)} · CPC title
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- What does patent US11188694B2 cover?
- The invention discloses a dynamic simulation method of circulating temperature variation in RMR subsea pump mud-lift drilling system, including steps: obtaining operating parameters, environmental parameters, well structure parameters and thermal parameters of target well; establishing temperature control equation of drill string in seawater section, temperature control equation of drill string…
- Who is the assignee on this patent?
- Univ Southwest Petroleum
- What technology area does this patent fall under?
- Primary CPC classification G06F30/28. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Nov 30 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).