Approaches to Predicting Flow Assurance Problems
Publication Date: 2016-Jan-08
The IP.com Prior Art Database
Carlos Arturo Garcia Zurita: AUTHOR [+2]
A common problem in flow assurance is to monitor when the operating pressure and temperature conditions in a well or flowline will cross different phase envelopes to predict formation and location on different phases along the system. For example, if a subsea tieback will enter a hydrate region, if wax can deposit in a flowline, or if asphaltene or scales can precipitate in the well. A well production model and a tuned fluid composition has to be used to run the current operating conditions. Next step, consists of calculating pressures and temperatures during the length of the system. Finally, superimposed all calculated pressures and temperatures on a phase envelope diagram to find at which point in the system (if any) pressures and temperatures are entering or leaving certain envelopes. Then in a pressure/temperature vs depth or length the engineer has to find where are located those pressure and temperature points that lie inside a particular envelope, if he/she wants to have an idea of location in the system where that particular phase should (theoretically) start to appear or precipitate. This is a cumbersome procedure that is performed manually.
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APPROACHES TO PREDICTING FLOW ASSURANCE PROBLEMS
In flow assurance, an engineer may want to monitor when the operating pressure and temperature conditions in a flow line will cross different phase envelopes to predict formation and location of different phases. For example, in a hydrocarbon environment, an engineer may want to determine if a subsea tieback will enter a hydrate region, if wax can deposit in a flow line, or if asphaltene or scales can precipitate in the well.
Embodiments of the present disclosure may provide methods, computing systems, and computer-readable media for predicting flow assurance problems.
In one embodiment, the approach involves generating a phase envelope for a fluid and running a pressure-temperature profile in a production simulator. If the phase is not a closed region, the approach may involve closing the region. The approach may also involve running a point-in-polygon algorithm for the pressure temperature profile and the phase closed region and plotting points inside the closed region in a pressure-temperature profile.
The foregoing summary is provided to introduce a selection of concepts that are further described below in the detailed description. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in limiting the scope of the claimed subject matter.
Brief Description of the Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present teachings and together with the description, serve to explain the principles of the present teachings. In the figures:
Figure 1 illustrates a flowchart of a method for predicting flow assurance problems.
Figure 2 illustrates one embodiment of a phase envelope.
Figure 3 illustrates a flow chart for closing an unclosed region.
Figure 4 illustrates a phase envelope for a closed region.
Figure 5 illustrates a flow chart for running the point in polygon algorithm.
Figure 6 illustrates a phase envelope with points inside the region marked.
Attorney Docket No.: IS14.8512-US-PSP
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Figure 7 illustrates a plot of points inside an asphaltene region.
Figure 8 illustrates a schematic view of a processor system.
The following detailed description refers to the accompanying drawings. Wherever convenient, the same reference numbers are used in the drawings and the following description to refer to the same or similar parts. While several embodiments and features of the present disclosure are described herein, modifications, adaptations, and other implementations are possible, without departing from the spirit and scope of the present disclosure.
In general, embodiments of the present disclosure may provide systems, methods, and computer-readable m...