Disconnect Tool Successfully and Efficiently Cements Electromagnetic Gauge Assembly in Place to Provide Key Reservoir Data

2021 ◽  
Author(s):  
Alexandru Dimcea ◽  
Iain Massie ◽  
Simon French ◽  
Dan Smith
Keyword(s):  
Data Transmission ◽  
Eastern Mediterranean ◽  
Drill String ◽  
Efficient Manner ◽  
Unique Challenge ◽  
Pilot Hole ◽  
Open Hole ◽  
Interference Test ◽  
Zonal Isolation ◽  
Software Modelling

Abstract An operator developing a deepwater field in the eastern Mediterranean required to monitor pressures in an upper sand section while producing from the main lower sands. If communication existed between the two zones, a planned late-life workover could be eliminated, reducing development cost. Gauges placed across the upper sands in a pilot hole would transmit pressure data to the production bore using electromagnetic (EM) transmission technology. Ensuring isolation of these gauges by cement was identified as critical in enabling effective EM data transmission and therefore a great deal of focus was placed on the design of the cement job. To perform the operation in as efficient manner as possible a tailored assembly was developed consisting of electronic gauges and EM relays isolated by open hole packers, along with a cementing assembly to allow cementation of the upper part of the string which included an EM receiver and relay in place. The cementing assembly consisted of a frac sleeve to allow the completion to be run and cemented in place, and a disconnect tool for the drill string to be disconnected in one run. Once disconnected from the completion, the abandonment of the pilot hole could continue without a trip out of the hole, saving significant time and costs to the operator. The cementjob design was tailored and verified by lab testing and software modelling to meet the objectives of the job and the unique challenge associated with the placement method proposed. Once the completion was installed in the production bore, communication between the gauges through the EM transmission system was confirmed and monitored during the subsequent well cleanup. The communication test verified annular isolation and system operability. Furthermore, upper and lower zonal isolation was proven by monitoring the gauge data in an interference test when flowing another well.

Successful CWD Campaign in Turnkey Project with Potential Utilisation for Well Construction Optimisation

2021 ◽  
Author(s):  
Louis Frederic Antoine Champain ◽  
Syed Zahoor Ullah ◽  
Alexey Ruzhnikov
Keyword(s):  
Cost Effective ◽  
Drill String ◽  
Successful Implementation ◽  
Delivery Time ◽  
Wellbore Instability ◽  
Third Phase ◽  
Drilling Parameters ◽  
Open Hole ◽  
Bottom Hole Assembly ◽  
Full Throttle

Abstract Drilling and completion of the surface and intermediate sections in some fields is extremely challenging due to wellbore instability, especially accomplished with complete losses. Such circumstances lead to several time-consuming stuck pipe events, when existing standard ways of drilling did not lead to a permanent resolution of the problems. After exhausting the available conventional techniques without sustainable success, unorthodox solutions were required to justify the well delivery time and cost. Here comes the Casing While Drilling (CwD), being the most time and cost-effective solution to wellbore instability. CwD is introduced at full throttle aiming at the well cost reduction and well quality improvement. The implementation plan was divided in three phases. The first phase was a remedial solution to surface and intermediate sections drilling and casing off to prevent stuck pipe events and provide smooth well delivery performances. After successful implementation of CwD first phase, CwD was taken to the next level by shifting it from a mitigation to an optimization measure. Each step of CwD shoe-to-shoe operations was analysed to improve its performances: drill-out (D/O) of 18⅝-in shoe track with CwD, optimum drilling parameters per formation and CwD bit design. Implemented in 19 wells, CwD shoe-to-shoe performances have been brought up or even above standard rotary bottom hole assembly (BHA) benchmark. Planning for third phase is undergoing whereby CwD is aiming to optimize a well construction to reduce well delivery time, by combining surface and intermediate sections thus eliminating one casing string. Numerous challenges are being worked on including open hole (OH) isolation packer which conform to and seal with the borehole uneven surface. Special "for purpose built" expandable steel packer and stage tool have been manufactured and qualified for the specific application. A candidate well has been chosen and agreed for first trial. The key areas of improvement include, drilling and casing off the surface and intermediate sections while competing with standard rotary BHA performances and slimming down the well profile towards tremendous time and costs savings. This paper encompasses details of constructions of various wells with sufficient contingencies to combat any expected hole problems without compromising the well quality while keeping the well within budget and planned time. It also provides an analysis of the well trials that were executed during the implementation of first and second phases of CwD implementation and the captured lessons learnt which are being carried forward to the next phase. This paper provides the technique on how CwD can be used to help with three aspects of drilling, successfully mitigating holes problems by reducing OH exposure time and to eliminate drill string tripping and modifying conventional casing design to reduce well time and cost by eliminating one casing string.

Successful Single-Stage Cementing in a Weak Formation: A Case History in Spain

2014 ◽  
Author(s):  
A.. Bottiglieri ◽  
A.. Brandl ◽  
R.S.. S. Martin ◽  
R.. Nieto Prieto
Keyword(s):  
Engineering Design ◽  
Case History ◽  
Laboratory Testing ◽  
Single Stage ◽  
Formation Damage ◽  
Cement Slurry ◽  
Integrity Test ◽  
Open Hole ◽  
Zonal Isolation ◽  
Horizontal Wellbore

Abstract Cementing in wellbores with low fracture gradients can be challenging due to the risk of formation breakdowns when exceeding maximum allowable equivalent circulation densities (ECDs). Consequences include severe losses and formation damage, and insufficient placement of the cement slurry that necessitates time-consuming and costly remedial cementing to ensure zonal isolation. In recent cementing operations in Spain, the formation integrity test (FIT) of the open hole section indicated that the formation would have been broken down and losses occurred based on calculated equivalent circulating densities (ECDs) if the cement slurry had been pumped in a single-stage to achieve the operator's top-of-cement goal. As a solution to this problem, cementing was performed in stages, using specialty tools. However, during these operations, the stage tool did not work properly, wasting rig time and resulting in unsuccessful cement placement. To overcome this issue, the operator decided to cement the section in a single stage, preceded by a novel aqueous spacer system that aids in strengthening weak formations and controlling circulation losses. Before the operation, laboratory testing was conducted to ensure the spacer system's performance in weak, porous formations and better understand its mechanism. This paper will outline the laboratory testing, modeling and engineering design that preceded this successful single stage cementing job in a horizontal wellbore, with a final ECD calculated to be 0.12 g/cm3 (1.00 lb/gal) higher than the FIT-estimated figure.

Improved Zonal Isolation in Open Hole Applications

2014 ◽  
Author(s):  
Johnny Bardsen ◽  
Paul Hazel ◽  
Ricardo R. Reves Vasques ◽  
Oyvind Hjorteland ◽  
Oystein Eikeskog
Keyword(s):  
Open Hole ◽  
Zonal Isolation

scholarly journals COVID-19 financing strategies for refugees and migrants in the Eastern Mediterranean Region

2021 ◽  
Vol 27 (12) ◽  
pp. 1229-1238
Author(s):  
Elena Habersky ◽  
Aya Damir
Keyword(s):  
Health Care ◽  
Health Insurance ◽  
Mediterranean Region ◽  
Eastern Mediterranean ◽  
Health Care Systems ◽  
Eastern Mediterranean Region ◽  
Health Financing ◽  
Efficient Manner ◽  
Internally Displaced ◽  
Care Systems

Background: The COVID-19 pandemic has had devastating consequences on health care systems worldwide. While the world was slowly moving towards achieving health for all, the pandemic destroyed progress made over the past 25 years and exposed the vulnerability of health care systems and health insurance schemes as well as their lack of resilience. Heath care systems failed to respond in a timely and efficient manner, lives have been, and continue to be, lost and vulnerable populations, especially refugees and migrants, are more at risk than ever as many are left out of country vaccination programmes. Aims: The Eastern Mediterranean region hosts 13 million internally displaced persons and 12 million refugees as of 2018. Thus, adopting inclusive health financing mechanisms is crucial to addressing the crisis and protecting indigenous and displaced populations. Methods: By looking at regional best practices and the response of the United Nations, we outline possible financing tools for including refugees and migrants in health insurance schemes for COVID 19 and introduce novel solutions for addressing gaps in funding. Results: Among the suggested solutions are the inclusion of refugees and migrants in national health care systems, setting up community-based health insurance for migrant and refugee populations, as well as introducing a catastrophe bond financing scheme. Conclusions: While COVID-19 is far from over, many countries in the EMR have included migrants in their COVID-19 vaccine rollout plans. While this is not the first instance of inclusion in some countries, many others are unable or do not prioritize migrants in their health systems, to the detriment of the entire country. This paper, therefore, tackles the possible health financing measures which curb or prevent migrants from accessing such systems and presents possible solutions to change the status quo.

Double Casing Exit for Side-Track to Commingle Two Borehole Sizes Based Sections in One Slim Shot to Well TD

2021 ◽  
Author(s):  
Meshal Al-Khaldi ◽  
Dhari Al-Saadi ◽  
Mohammad Al-Ajmi ◽  
Abhijit Dutta ◽  
Ibrahim Elafify ◽  
...  
Keyword(s):  
Challenging Behaviors ◽  
Single Shot ◽  
Close Monitoring ◽  
Drilling Parameters ◽  
Wellbore Pressure ◽  
Open Hole ◽  
Zonal Isolation ◽  
Side Track ◽  
First Time

Abstract This project began when a 9-5/8" in 43.5 ppf production casing became inaccessible due to the existing cemented pipe inside, preventing further reservoir section exposure and necessitating a mechanical side-track meanwhile introducing the challenge of loosing one section and imposimg slim hole challenges. The size and weight of the double-casing made for challenging drilling, as did the eight very different formations, which were drilled. The side-track was accomplished in two steps, an 8½ in hole followed by a single long 6⅛ in section, rather than the three steps (16 in, 12¼ in, 8½ in) that are typically required. The optimal kick off point carfully located across the dual casing by running electromagnetic diagnostics, the casing collar locator, and the cement bond log. The double casing mill was carefully tailored to successfully accomplish the exit in one run. Moreover, an extra 26 ft. MD rathole was drilled, which helped to eliminate the mud motor elongation run. A rotary steerable system was utilized directly in a directional BHA to drill an 8½ in open hole building section from vertical to a 30⁰ inclination. A 7.0 in liner was then set to isolate weak zones at the equivalent depth of the outer casing (13-3/8"). Subsequently, a single 6⅛ in section was drilled to the well TD through the lower eight formations. Drilling a 6⅛ in section through eight formations came with a variety of challenges. These formations have different challenging behaviors relative to the wellbore pressure that typically leads to the drilling being done in two sections. Modeling the geo-mechanical characteristics of each formation allowed the determination of a mud weight range and rheology that would stabilize the wellbore through all eight formations. The slim, 6⅛ in, hole was stabilized with higher equivalent circulating density (ECD) values than is typically used in larger boreholes. Optimizing mud weight and drilling parameters, while managing differential sticking with close monitoring of real-time ECD, helped to stabilize the high-pressurized zones to deliver the well to the desired TD with a single borehole. This project represents the first time in Kuwait that double casings in such large sizes have been cut and sidetracked. It is also the first time these eight formations have been cut across such a smaller hole size, slim hole (6⅛ in) in a single shot. Geo-mechanical modeling allowed us to stabilize the pressurized formations and to control the ECD. The well also deployed the longest production liner in the field commingling multiple reservoirs with differnt pore pressure ramps, with excellent cement quality providing optimal zonal isolation.

Multiple Zone Open Hole Gravel Packing Techniques with Zonal Isolation

2002 ◽  
Author(s):  
T. Gary Corbett ◽  
E. Harold Vickery
Keyword(s):  
Open Hole ◽  
Zonal Isolation ◽  
Gravel Packing

A Challenging Drilling Campaign Unleashed a Unique Fast Drill String Recovery Methodology Eliminating Utilizing Wireline, CT and Overcome Highly Deviated String Accessibility

2021 ◽  
Author(s):  
Khaled Abdelhalim ◽  
Mohamed Al Zaabi ◽  
Salim Al Ali ◽  
Islam khaled Abdel Karim ◽  
Haitham Jadallah ◽  
...  
Keyword(s):  
Drill String ◽  
Fast Recovery ◽  
Significant Cost ◽  
Engineering Team ◽  
Downhole Tool ◽  
Environmentally Safe ◽  
Zonal Isolation ◽  
Drill Pipes ◽  
Side Track ◽  
Operating Company

Abstract Stuck pipe is one of the biggest challenges in the drilling sector and is a multi-billion-dollar issue. Recovering from stuck pipe absorbs significant cost and time. Durations for stuck pipe events and recovery can be mostly variable from a few days to up to over a month to resolve. When attempts to release the stuck pipe by jarring or acid fail, the operating company and drilling contractors are left with little option but to sever the drill string and prepare for side-track operations or even abandon the hole. Traditional pipe severance methods in the event of a stuck pipe situation typically take significant time (often days, and sometimes weeks), require specialist tools, Service Hands, and are usually reliant on wireline services to deliver the severance method. In 2018, a Major Operating Company in UAE faced a challenging high-sticking Formation, which caused massive NPT, stuck of drill strings, and loss of drilled section holes. Brainstorming within the Drilling Engineering team took the campaign to the next level of pre-planning to reach deep access in the hole to be able to achieve zonal isolation by spotting cement plugs through drilling BHA, find a solution to save the hole and recover the pipes in an efficient, cheap and productive manner. An environmentally safe pre-planned solution to severe the drill string was proposed to help save the wells and allow an excellent methodology to save the wells/fields from stuck pipe risks. The engineering solution allows a fast recovery of drill pipes using a downhole tool as a part of drilling BHA, with the option to activate it if required, by dropping a smart dart and circulating with mud for a specific time to apply cut string with two option, either spotting cement with recovered BHA or lift BHA with fish neck to try to fish in the hole.

Game Changing Cementless Annular Isolation Improving Economical Returns in Deep Water Wells

2021 ◽  
Author(s):  
Manfred Bledou ◽  
Didier Caillon ◽  
Benjamin Groschaus ◽  
Guillaume Viger ◽  
Harpal Singh ◽  
...  
Keyword(s):  
Substantial Reduction ◽  
Innovative Technology ◽  
Pressurized Water ◽  
Field Development ◽  
Increased Risk ◽  
Open Hole ◽  
Well Trajectory ◽  
Zonal Isolation ◽  
Field Deployment ◽  
The Cost

Abstract This paper will discuss a game-changing and innovative technology that enabled cementless annular isolation (liner to borehole) across the reservoir, removing the risk of previous experienced cost and time overrun from complex cement operations and securing the full economical return on the wells. The technology has been deployed in four Moho North Albian wells, drilled through a complex reservoir with highly laminated lithology requiring efficient zonal isolation for both acid treatment and water shut off. During the earlier field development, many cementing challenges were encountered that increased risk and cost and the ability to deliver effective isolation across the reservoir. Poor isolation leads to poor matrix acid stimulation, higher skin and a higher risk of water production. To address this the operator sponsored an industry challenge to achieve reservoir isolation with cost and risk reduction and to deliver overall efficiency gains. Through dialogue between the Operator and a leading service provider in Open Hole Zonal Isolation, a solution was identified that would effectively replace the cement across the reservoir with a metal expandable annular sealing system. Time for delivery was a key driver to meet the drilling schedule and materialize the cost and risk reductions on the remaining wells. A scope of work was completed that included extensive qualification, manufacture and field deployment. The solution has proven to deliver benefits that address several fundamental aspects which were associated with the cemented liners: Substantial reduction in risk and cost associated with drilling the extended rat hole (shoe track) into the highly pressurized water zone (+/- 100mMD)Removed the risk and cost for the additional run to under ream the 6 ½″ hole to 7 ¼″ (low-ROP)Provided more certainty for zonal isolation whilst delivering effective acid stimulation and maintaining the low skin values. The technology has many different applications within wells where conventional cement is challenged beyond its capabilities and inherently not fit for purpose, due to factors such as well trajectory, hole geometry, reservoir uncertainty, downhole environment (pressure, Temp, ECD) etc. Within these environments, the technology developed for Moho North adds a proven solution to the Operators toolbox, a technology that is already finding alternate applications and planned deployments.

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