Measurement-While-Drilling Mud Pulse Detection Process: An Investigation of Matched Filter Responses to Simulated and Real Mud Pressure Pulses

1988 ◽  
Author(s):  
J.L. Marsh ◽  
E.C. Fraser ◽  
A.L. Holt
Keyword(s):  
Matched Filter ◽  
Drilling Mud ◽  
Pulse Detection ◽  
Detection Process ◽  
Pressure Pulses ◽  
Measurement While Drilling ◽  
Mud Pressure

FIELD RESULTS USING MEASUREMENT-WHILE-DRILLING DIRECTIONAL SYSTEMS IN LONG BEACH, CALIFORNIA

1981 ◽  
Vol 21 (1) ◽  
pp. 213
Author(s):  
M. Gearhart
Keyword(s):  
Drill Pipe ◽  
Oil Field ◽  
Maximum Deviation ◽  
Directional Drilling ◽  
Long Beach ◽  
Bottom Hole ◽  
Pressure Pulses ◽  
Measurement While Drilling ◽  
Degree Of Control ◽  
Mud Pressure

One of the more extensive uses of directional drilling anywhere in the world has been in the development of the East Wilmington Oil Field in Long Beach, California. The average well is deviated from vertical in excess of 50° and wells with a maximum deviation in the 70° to 80° range are not uncommon before they are dropped off to 50° or less when penetrating the completion interval. Over 780 wells have been drilled in this field to date, requiring the highest degree of control and accuracy in order to avoid intersection of other wells and to obtain proper bottom hole spacing. The Measurement-While-Drilling (MWD) directional system has been tested on several wells and proven to provide the required accuracy, along with many advantages over past methods, used in the field development.Accurate transmission by MWD of bottom-hole measurements to the surface is provided by mud pressure pulses generated in the drill pipe downhole and detected by a pressure transducer includes the means for detecting, recording and processing these pressure pulses, to translate the information from the pressure pulses to rig floor displays usable by the drilling crew.

scholarly journals Development of an automated system of control over a drilling mud pressure at the inlet to a well

2020 ◽  
Vol 4 (2 (106)) ◽  
pp. 82-94
Author(s):  
Andrii Lahoida ◽  
Vasyl Boryn ◽  
Georgiy Sementsov ◽  
Vasyl Sheketa
Keyword(s):  
Automated System ◽  
Drilling Mud ◽  
Mud Pressure

Significant Surge and Swab Offshore Brazil Induced by Rig Heave during Drillpipe Connections

2021 ◽  
pp. 1-8
Author(s):  
John-Morten Godhavn ◽  
Banzi Olorunju ◽  
Dmitri Gorski ◽  
Martin Kvernland ◽  
Mateus Sant`Ana ◽  
...  
Keyword(s):  
North Sea ◽  
Sampling Rate ◽  
Drilling Mud ◽  
Long Distance ◽  
Pressure Oscillations ◽  
The North ◽  
Order Of Magnitude ◽  
Measurement While Drilling ◽  
Well Trajectory ◽  
The North Sea

Summary In this paper, we describe measured and simulated downhole pressure variations (“surge and swab”) during drillpipe connections when drilling an ultradeepwater well offshore Brazil on Bacalhau (former Carcará) Field. Floating rig motion caused by waves and swell (“rig heave”) induces surge and swab when the drillstring is suspended in slips to make up or break a drillpipe connection and topside heave compensation is temporarily deactivated. This is a known issue in regions with harsh weather, such as the North Sea, where pressure oscillations of up to 20 bar have been reported during connections. Recorded downhole drilling data from Bacalhau Field reveals significant pressure oscillations downhole (in the same order of magnitude as in the North Sea) each time the drillstring was suspended in slips to make a connection in the subsalt 8½-in. section of the well. Mud losses were experienced around the same well depth, and they might have been caused by surge and swab. Measured surge and swab pressure variations have been reproduced in an advanced proprietary surge and swab simulator that considers rig heave, drillpipe elasticity, well friction, non-Newtonian drilling mud, well trajectory, and geometry. Moreover, findings in this paper suggest that surge and swab was in fact significantly higher than recorded by the measurement while drilling (MWD) tool. The true magnitude of surge and swab is not captured in the recorded MWD data due to low sampling frequency of the downhole pressure recording (one measurement every 6 seconds, a standard downhole pressure sampling rate used on many operations today). This work shows that surge and swab during drillpipe connections on floaters may challenge the available pressure window for some wells, even in regions with calm weather such as Brazil. Managed pressure drilling (MPD) is a technique that improves control of the downhole pressure. It is, however, not possible to compensate fast downhole pressure transients, such as heave-induced surge and swab, using MPD choke topside. This is due to the long distance between the choke and the bit, which translates into a time delay in the same order of magnitude as typical wave and heave periods. A downhole choke combined with continuous circulation is one of the potential solutions. Surge and swab during drillpipe connections can result in a loss or an influx and should be considered in the well planning phase when mud weight, section lengths, etc. are selected.

Study of ground collapse induced by large-diameter horizontal directional drilling in a sand layer using numerical modeling

2015 ◽  
Vol 52 (10) ◽  
pp. 1562-1574 ◽  
Author(s):  
Biao Shu ◽  
Baosong Ma
Keyword(s):  
Numerical Modeling ◽  
Oil And Gas ◽  
Large Diameter ◽  
Ground Surface ◽  
Soil Parameters ◽  
Directional Drilling ◽  
Drilling Mud ◽  
Horizontal Directional Drilling ◽  
Ground Collapse ◽  
Mud Pressure

With large-diameter horizontal directional drilling (HDD) becoming the preferred method to construct oil and gas pipelines and utility pipelines beneath rivers, the issue of potential ground collapse arises when drilling in loose geological layers such as sand. Ground collapse is a result of borehole collapse and may cause significant damage to the topography and nearby facilities. The present investigation considered the potential causes of ground collapse induced by an actual 1.219 m diameter HDD river-crossing project, using the FLAC3D numerical modeling tool. The analysis showed that the failure zone first developed at the crown of the borehole, resulting in subsequent borehole collapse due to instability of the sand above, and eventually leading to ground collapse. Sequential reaming cycles have been simulated and the results indicate very little effect in comparison with a single reaming cycle. The risk of borehole collapse, and consequent ground collapse, increases with borehole diameter. Parametric numerical modelling has also been conducted to study the influence of soil parameters and drilling mud pressure on the stability of the ground surface above the borehole. The results show that soil cohesion and friction angle have a large influence on stability of the borehole and ground surface, while elastic modulus and Poisson’s ratio have relatively little effect. It was also determined that mud pressure is a very important factor in maintaining stability of the borehole, and therefore the ground surface as well.

CFD Numerical Simulation for Downhole Thruster Performance Evaluation

2018 ◽  
Author(s):  
Bashir Mohamed ◽  
Abdelsalam N. Abugharara ◽  
M. A. Rahman ◽  
Stephen D. Butt
Keyword(s):  
Numerical Simulation ◽  
Power Law ◽  
Mechanical Design ◽  
Pressure Effects ◽  
Drilling Mud ◽  
Ansys Fluent ◽  
Pressure Drops ◽  
Drilling Performance ◽  
Power Law Fluids ◽  
Pressure Pulses

This study focuses on numerical simulation and evaluation of a hydraulically powered downhole Thruster. This device is numerically simulated and evaluated using ANSYS Fluent 17.2 to show its generation of pressure pulses that can induce downhole forces that magnify the downhole dynamic weight on bit (DWOB) using drilling mud. Such magnification of the DWOB can produce axial motion of the Thruster. Such axial motions, as proved by many publications can improve the drilling rate of penetration (ROP), release stuck pipes, and reduce frictions in non-vertical wells. The special inner design of the Thruster creates pressure pulses that can provide load impact on the drill bit leading to the increase of WOB that can enhance the drilling performance. The current stage of the study of the Thruster involves a mechanical design of the Thruster by the SolidWorks and an evaluation of the tool function and performance through pressure effect simulation by ANSYS Fluent 17.2. Initially, water is used as the fluid and the main parameters involved in the analysis are pressure and velocity. However, power-law as a non-Newtonian fluid is also used for comparison study in the section of pressure drop analysis. The results are analyzed based on velocity pressure profiles, pressure drops, pressure effects with applications of various back pressures at several planes using water and power-law fluids.

Effect of Mud Shedding on Riser Anti-Recoil Control at Emergency Disconnect

2012 ◽  
Author(s):  
Songcheng Li ◽  
Mike Campbell ◽  
Hugh Howells ◽  
Simeon Powell
Keyword(s):  
Sea Water ◽  
Housing System ◽  
Drilling Mud ◽  
Element Analysis ◽  
Before And After ◽  
Pressure Impact ◽  
Emergency Events ◽  
Mud Pressure ◽  
Mud Flow

With drilling capability extends to water depths up to 3000m, significantly increased is the risk associated with a failed riser recoil control in the event of an emergency riser disconnect due to loss of vessel station keeping. In deeper waters the tensioner system undertakes higher top tension due to the accumulation of riser length and mud weight. During emergency disconnect, the riser is disconnected between the blow-out preventer (BOP) and the lower marine riser package (LMRP), releasing the base tension and mud pressure. Impact between the top riser system and the diverter housing system should be avoided, and the clearance between the LMRP and BOP should be secured. Efforts have been continuously made in the industry to achieve a more accurate predict of the riser recoil response. The relevance of mud discharge to recoil control has been widely discussed but little quantitative data has been revealed in the literature. In this paper, effect of mud shedding on riser recoil response is discussed. The Herschel-Bulkley rheology model is utilized for mud flow and is considered the latest advance in the drilling industry. Water hammer theories with column separation are modified to account for mud discharge in laminar, transitional and turbulent flow regimes. As a case study herein, recoil response of a drilling riser attached to a dynamically positioned semi-submersible drilling vessel is assessed to present the mud discharge effect on riser anti-recoil control. At emergency events, the riser is disconnected above the BOP, which is located at a water depth of about 2150m for this study. Mud is generally preferred to be freely discharged during an emergency disconnect for ease of anti-recoil control and riser integrity. The density difference between drilling mud in the riser annulus and sea water outside the riser outer casing before disconnect induces a high pressure difference, which drives mud shedding at riser disconnect. Mud flow rate plays an important role in the speed control of the riser uplift. 3D finite element analysis is performed in time domain to simulate riser response before and after disconnect. 2HRECOIL software is integrated into ANSYS user programmable features to better model the riser response and mud discharge.

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