Monitoring and control strategies to manage pressure fluctuations during oil well drilling

Vega, Márcia Peixoto; Oliveira, Gabrielle Fontella de Moraes; Fernandes, Lucas; Martins, André Leibsohn

doi:10.1016/j.petrol.2018.03.048

Cited by 11 publications

(2 citation statements)

References 24 publications

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“…With the development of oilfield exploration and development, the formation pressure decreases rapidly and circulation loss of the workover fluid is serious [1][2][3][4]. Previously, many plugging methods were used to prevent the plug leaks, such as oil-soluble resin [5,6], composite shielding temporary plugging [7][8][9][10], gel plugging agent [11], and microbubble workover fluid [12].…”

Section: Introductionmentioning

confidence: 99%

A self-breaking supramolecular plugging system as lost circulation material in oilfield

Zhang

Jiang

2020

Open Chemistry

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AbstractLost circulation is a frequently encountered problem during workover operations of a low-pressure reservoir. Many lost circulation materials (LCM) have been used to solve the problem, but various disadvantages still exist, for example, oil-soluble materials are easy to get stuck in the pipe string as the temperature drops and gel time and gel strength of the cross-linking gel systems are difficult to control in the occasion of inadequate stirring. A self-breaking supramolecular plugging system used to control lost circulation of workover operations is developed, and it can encounter the aforementioned disadvantages of the traditional LCM. The system forms a space grid structure by non-covalent bonds between the molecules without adding a cross-linking agent. Sand beds plugged with the supramolecular plugging system had a pressure bearing capacity of 4.5 MPa. The self-breaking rate of the supramolecular system was 100% after 7 days at a temperature of 120°C. The core permeability recovery of the self-breaking liquid was 91.9%, indicated that the plugging system is compatible of the reservoir. The supramolecular plugging system has been used in four wells in the Jidong oilfield of East China. Field practice showed that the supramolecular LCM can effectively control lost circulation at different rates during workover operations. The increase in the daily fluid after operations indicated that the slurry has not damaged the reservoir.

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Section: Introductionmentioning

confidence: 99%

A self-breaking supramolecular plugging system as lost circulation material in oilfield

Zhang

Jiang

2020

Open Chemistry

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“…In the oil and gas industry, the continuously increasing demand for underground resources has led to a shift in the focus on exploration and exploitation to deep or ultra-deep reservoirs. Due to the complicated geological conditions of these reservoirs, drilling technology aimed at creating a wellbore to reach the gas or oil reservoir encounters a multitude of challenges, particularly within narrow pore-fracture pressure windows [1,2]. Over the course of drilling, incidents occur frequently and cause various disadvantages, such as longer drilling times, higher costs, and vast risks.…”

Section: Introductionmentioning

confidence: 99%

A Hydraulic Model for Multiphase Flow Based on the Drift Flux Model in Managed Pressure Drilling

Fang

Meng

et al. 2019

Energies

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Managed pressure drilling (MPD) is a drilling technique used to address the narrow density window under complex geological environments. It has widespread applications in the exploration and exploitation of oil and gas, both onshore and offshore. In this study, to achieve effective control of the downhole pressure to ensure safety, a gas-liquid two-phase flow model based on the drift flux model is developed to describe the characteristics of transient multiphase flow in the wellbore. The advection upwind splitting method (AUSM) numerical scheme is used to assist with calculation and analysis, and the monotonic upwind scheme for conservation laws (MUSCLs) technique with second-order precision is adopted in combination with the Van Leer slope limiter to improve precision. Relevant data sourced from prior literature are used to validate the suggested model, the results of which reveal an excellent statistical consistency. Further, the influences of various parameters in a field application, including backpressure, density, and mass flow, are analyzed. Over the course of later-stage drilling, a combination of wellhead backpressure and displacement is recommended to exercise control. Energies 2019, 12, 3930 2 of 21 MPD with the homogeneous flow model (HFM), two-fluid model (TFM), and drift flow model (DFM).The HFM is incapable of ensuring accuracy in reflecting the flow characteristics of each phase, and its calculation accuracy is less than satisfactory; thus, it is rarely applied nowadays. A four-dimensional hypercube has been suggested to describe gas-liquid two-phase flow, and a set of hyperbolic partial differential equations (PDEs) can be derived [10,11]. Of these, the most complicated is the high-fidelity model, which has the capability of describing how physical variables (momentum, mass, and energy) are transmitted and meet the requirements of the thermodynamic equilibrium equation [12][13][14][15]. Despite this, these models are highly complicated to solve, and it is possible that the calculation process does not converge enough to use high-order numerical schemes. Therefore, the simplified DFM was first suggested by Zuber and Findlay [16] and was subsequently improved by Ishii [17]. In the DFM, mass conservation of the gas-liquid two-phase is taken into consideration separately, and the interactions occurring between the two phases are discounted. Relative to the TFM, the DFM demonstrates various advantages such as having a simple form and less computation; thus, it has been commonly applied in the theoretical research process [18][19][20]. In order to enhance its accuracy, the majority of the following studies concentrated on the empirical parameters of this constitutive relationship. In fact, the calculation process remains complicated to some extent. In addition, there are many more simplified equations that have been derived for application under different scenarios, including early gas-kick detection and parameter estimation [21][22][23][24]. However, these models give no consideration to how the chara...

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A Novel Model to Calculate the Fluctuating Pressure in Eccentric Annulus for Bingham Fluid

Wang

et al. 2022

Computational and Experimental Simulations in Engineering

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Monitoring and control strategies to manage pressure fluctuations during oil well drilling

Cited by 11 publications

References 24 publications

A self-breaking supramolecular plugging system as lost circulation material in oilfield

A self-breaking supramolecular plugging system as lost circulation material in oilfield

A Hydraulic Model for Multiphase Flow Based on the Drift Flux Model in Managed Pressure Drilling

A Novel Model to Calculate the Fluctuating Pressure in Eccentric Annulus for Bingham Fluid

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