MPD During the Global Pandemic in the Gulf of Mexico - How Virtual Meetings, Planning, and Communication Facilitated a Safe and Successful Implementation of CBHP MPD

2021 ◽  
Author(s):  
Nathan Tuckwell ◽  
Akram Nabiyev ◽  
Martyn Parker ◽  
Isabel Poletzky

Abstract This paper details how a major international operator was able to work directly with a Managed Pressure Drilling (MPD) service provider during the global pandemic to mobilize to a deep water Tension Leg Platform (TLP) in the Gulf of Mexico in fewer than four weeks from notification to being operationally ready. Apart from the time crunch, the challenging part was achieving it virtually without face-to-face meetings or rig visit. The legacy hydraulically controlled MPD system used on the previous well had proven to be very challenging. It could not provide the desired precise control to maintain the annular pressures within the operational window, thus necessitating a change. Furthermore, the deck space limitations had significantly restricted the equipment that could be used to gain accurate pressure control. Despite COVID, all the planning stages were performed, albeit virtually, and a compact modular electric servo choke MPD system was deployed, installed, and commissioned within four weeks from the initial discussions. The new MPD system, which replaced the legacy system, was successfully utilized on this project executing the constant bottom hole pressure (CBHP) MPD variations. It achieved bottom hole pressure (BHP) control within a 0.1 - 0.2 ppg operational window. This paper will discuss how, operationally, this 1-man per shift MPD crew communicated with the rig and operator personnel, delivered accurate pressure control on connections, performed dynamic formation integrity tests (FITs), delivering flawless execution, and meeting the client's expectations. Global pandemic made big changes in our work, learning and interact with people with social distancing.

Author(s):  
Fabio Ernesto Rodriguez Corredor ◽  
Majid Bizhani ◽  
Ergun Kuru

Effective hole cleaning in horizontal and extended reach wells (ERD) often requires use of high circulation rates, which may not be always achievable due to the risk of circulating bottom hole pressure reaching the fracture limit of the rock. Achieving good hole cleaning while keeping the circulating bottom hole pressure within the safe operational window is very often the major engineering challenge. A drag reducing fluid with good hole cleaning ability could be a potential solution in this case. In order to see if it is possible to use a drag reducing fluid and still achieve a good hole cleaning, an experimental program was designed and conducted. The main objective of this experimental study was to compare the hole cleaning performances of water and a drag reducing fluid. The hole cleaning experiments were conducted using a 9m long horizontal flow loop with concentric annular geometry (Outer Pipe ID = 95 mm, Inner Pipe OD = 38 mm, ID/OD ratio = 0.4). The drag reducing additive was a commercially available partially hydrolyzed polyacrylamide (PHPA). Water and two drag reducing fluids with 0.07% V/V and 0.1% V/V PHPA concentrations were used. Critical velocities for the initiation of cuttings movement with rolling, saltation/dunes, and suspension modes were determined and compared when using water and drag reducing fluids as a carrier fluid. Critical velocities for the initiation of cuttings movement were found to be lower with water than that of drag reducing fluid in all transport modes.


2016 ◽  
Author(s):  
Q. Ge ◽  
A. E. Shahat ◽  
B. N. Kodiah ◽  
M. A. Hay ◽  
M. S. Al-Hosani

2020 ◽  
pp. 014459872096415
Author(s):  
Jianlin Guo ◽  
Fankun Meng ◽  
Ailin Jia ◽  
Shuo Dong ◽  
Haijun Yan ◽  
...  

Influenced by the complex sedimentary environment, a well always penetrates multiple layers with different properties, which leads to the difficulty of analyzing the production behavior for each layer. Therefore, in this paper, a semi-analytical model to evaluate the production performance of each layer in a stress-sensitive multilayer carbonated gas reservoir is proposed. The flow of fluids in layers composed of matrix, fractures, and vugs can be described by triple-porosity/single permeability model, and the other layers could be characterized by single porosity media. The stress-sensitive exponents for different layers are determined by laboratory experiments and curve fitting, which are considered in pseudo-pressure and pseudo-time factor. Laplace transformation, Duhamel convolution, Stehfest inversion algorithm are used to solve the proposed model. Through the comparison with the classical solution, and the matching with real bottom-hole pressure data, the accuracy of the presented model is verified. A synthetic case which has two layers, where the first one is tight and the second one is full of fractures and vugs, is utilized to study the effects of stress-sensitive exponents, skin factors, formation radius and permeability for these two layers on production performance. The results demonstrate that the initial well production is mainly derived from high permeable layer, which causes that with the rise of formation permeability and radius, and the decrease of stress-sensitive exponents and skin factors, in the early stage, the bottom-hole pressure and the second layer production rate will increase. While the first layer contributes a lot to the total production in the later period, the well bottom-hole pressure is more influenced by the variation of formation and well condition parameters at the later stage. Compared with the second layer, the scales of formation permeability and skin factor for first layer have significant impacts on production behaviors.


2013 ◽  
Vol 37 ◽  
pp. 3291-3298 ◽  
Author(s):  
Mingze Liu ◽  
Bing Bai ◽  
Xiaochun Li

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