Effective Application of Metal Expandable Packer to Prevent Gas Migration Issues, Leaks of Gas and Fluids in Annulus, Well Integrity Problems (Russian)

2019 ◽  
Author(s):  
Ivan Lebedev ◽  
Aydar Gabdullin ◽  
Valeriy Pogurets ◽  
Sergey Novikov
Keyword(s):  
Gas Migration ◽  
Effective Application ◽  
Well Integrity

Enhanced Cement Composition for Preventing Annular Gas Migration

2019 ◽  
Author(s):  
George Kwatia ◽  
Mustafa Al Ramadan ◽  
Saeed Salehi ◽  
Catalin Teodoriu
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Oil Well ◽  
Gas Migration ◽  
Cement Slurry ◽  
Gas Industry ◽  
Well Integrity ◽  
Transit Times ◽  
Well Cement ◽  
Gas Tight

Abstract Cementing operations in deepwater exhibit many challenges worldwide due to shallow flows. Cement sheath integrity and durability play key roles in the oil and gas industry, particularly during drilling and completion stages. Cement sealability serves in maintaining the well integrity by preventing fluid migration to surface and adjacent formations. Failure of cement to seal the annulus can lead to serious dilemmas that may result in loss of well integrity. Gas migration through cemented annulus has been a major issue in the oil and gas industry for decades. Anti-gas migration additives are usually mixed with the cement slurry to combat and prevent gas migration. In fact, these additives enhance and improve the cement sealability, bonding, and serve in preventing microannuli evolution. Cement sealability can be assessed and evaluated by their ability to seal and prevent any leakage through and around the cemented annulus. Few laboratory studies have been conducted to evaluate the sealability of oil well cement. In this study, a setup was built to simulate the gas migration through and around the cement. A series of experiments were conducted on these setups to examine the cement sealability of neat Class H cement and also to evaluate the effect of anti-gas migration additives on the cement sealability. Different additives were used in this setup such as microsilica, fly ash, nanomaterials and latex. Experiments conducted in this work revealed that the cement (without anti-gas migration additive) lack the ability to seal the annulus. Cement slurries prepared with latex improved the cement sealability and mitigated gas migration for a longer time compared to the other slurries. The cement slurry formulated with a commercial additive completely prevented gas migration and proved to be a gas tight. Also, it was found that slurries with short gas transit times have a decent potential to mitigate gas migration, and this depends on the additives used to prepare the cement slurry.

WELL INTEGRITY IN COLORADO'S DENVER-JULESBURG BASIN: CONVENTIONAL VS. UNCONVENTIONAL WELLS AND IMPLICATIONS FOR STRAY GAS MIGRATION

2016 ◽  
Author(s):  
Greg Lackey ◽  
◽  
Harihar Rajaram ◽  
Owen A. Sherwood ◽  
Troy L. Burke ◽  
...  
Keyword(s):  
Gas Migration ◽  
Well Integrity

Foamed Cement Analysis With Computed Tomography

2014 ◽  
Author(s):  
Dustin Crandall ◽  
Magdalena Gill ◽  
Johnathan Moore ◽  
Barbara Kutchko
Keyword(s):  
Computed Tomography ◽  
High Stress ◽  
Three Dimensional ◽  
Image Data ◽  
Gas Migration ◽  
Structure Quality ◽  
Air Voids ◽  
Well Integrity ◽  
X Ray Computed

Foamed cements are widely used for cementing oil or gas wells that require lightweight slurries, gas migration prevention, or wells in high-stress environments. When this manufactured slurry solidifies in the sub-surface environment the distribution of gas voids can affect the resultant strength, permeability, and stability of the wellbore casing. Researchers at the National Energy Technology Laboratory have produced the first high-resolution X-ray computed tomography (CT) three-dimensional images of atmospheric and field generated foamed cement across a range of foam qualities. CT imaging enabled the assessment and quantification of the foamed cement structure, quality, and bubble size distribution in order to provide a better understanding of this cement. Ultimately, this research will provide industry the knowledge to ensure long-term well integrity and safe operation of wells in which foamed cements are used. Initial results show that a systematic technique for isolating air voids can give consistent results from the image data, laboratory generated foamed cements tend to be uniform, and that high-gas fraction foamed cements have large interconnected void spaces.

scholarly journals Securing Annulus Abnormal Pressure Build-up (APB) with Polymer Plug; a Case Study

2020 ◽  
Vol 1 (2) ◽  
pp. 62
Author(s):  
Ganesha R Darmawan
Keyword(s):  
Operating Pressure ◽  
Gas Migration ◽  
Well Control ◽  
Well Integrity ◽  
Abnormal Pressure ◽  
Additional Challenge ◽  
Cement Plug ◽  
Planning And Operation ◽  
Integrity Issue

The life cycle of a production well was facing challenges related to well integrity issue where A-Annulus pressure tracking the tubing pressure and increased repeatedly above the Maximum Allowable Wellhead Operating Pressure (MAWOP). Several well control operations were executed to reduce A-Annulus abnormal pressure build-up (APB) with no success.Literature and well historical studies were performed in order to secure this well, normal bleed and lube was ruled out owing to several attempts already performed for more than a year, but the APB keep on appearing after 2-4 months. Bullheading is not a viable option to kill the well. Well securing planned and prepared with some options such as, mechanical barriers/plugs, cement plug or polymer plugs as temporary plug to avoid APB re-occurrence. There were some constrains in operation planning that need to be addressed carefully, with additional challenge of tight injectivity as if it was a closed system.The polymer plug successfully stops the gas migration to surface, and secured the well from any reoccurrences of APB. The details of well control histories, operation design and planning and operation execution with the complete results and evaluation will be presented in this paper.

Experimental investigation of well integrity: Annular gas migration in cement column

2019 ◽  
Vol 179 ◽  
pp. 126-135 ◽  
Author(s):  
Mustafa Al Ramadan ◽  
Saeed Salehi ◽  
George Kwatia ◽  
Chinedum Ezeakacha ◽  
Catalin Teodoriu
Keyword(s):  
Experimental Investigation ◽  
Gas Migration ◽  
Well Integrity

scholarly journals Well Integrity: Modeling of Thermo-Mechanical Behavior and Gas Migration along Wells-Application to Ketzin Injection Well

2012 ◽  
Vol 23 ◽  
pp. 462-471 ◽  
Author(s):  
Le Guen Yvi ◽  
Asamoto Shingo ◽  
Houdu Emmanuel ◽  
Poupard Olivier
Keyword(s):  
Mechanical Behavior ◽  
Injection Well ◽  
Gas Migration ◽  
Well Integrity

Mud-Removal Efficiency Boost by Engineered Scrubbing Spacer in Cementing Operations at Caspian Sea

2021 ◽  
Author(s):  
Amanmammet Bugrayev ◽  
Ravindra Kumar Singh ◽  
Svetlana Nafikova ◽  
Ilshat Akhmetzianov ◽  
Guvanch Gurbanov ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Successful Implementation ◽  
Gas Migration ◽  
Negative Consequences ◽  
Well Integrity ◽  
Annular Gap ◽  
Challenging Environment ◽  
Zonal Isolation ◽  
Cement Sheath

Abstract Long-term well integrity and zonal isolation are the ultimate objectives for cementing in the well construction process. Effective mud removal plays an essential role in obtaining competent zonal isolation and hence should not be overlooked and underestimated. The negative consequences of poor mud removal can lead to microannulus, channeling, or gas migration, which might require costly time-consuming remediation. The conventional approach of optimizing spacers based on chemical interactions with the mud layer does not always yield desired results and, thus, demanding further improvement. In this paper we discuss the approach taken to boost the mud removal efficiency by implementing an innovative engineered scrubbing spacer containing fibers in a challenging environment, resulting in notable improvement in long-term cement sheath integrity. The engineered scrubbing fibers were thoroughly tested in the laboratory to ensure spacer stability and efficiency. The new spacer with an additional scrubbing capability was introduced to one of the major operators on the Caspian shelf and after successful implementation, it has now been used on more than 20 cementing operations. Scrubbing fibers concentration was optimized through thorough laboratory testing covering flowability, dispersibility, and mud removal efficiency; later, it was applied on most of the cement operations, including 4½-in. liners characterized by a very narrow annular gap across the hanger sections. Cement evaluation log results from those cementing operations demonstrated an improvement in mud removal efficiency, suggesting no issues associated with microannulus, channeling, or gas migration, thus confirming the effectiveness of the newly implemented engineered scrubbing spacer. The typical challenges associated with meeting the zonal isolation requirement on one of the offshore fields of the Caspian shelf, and the success of the approach taken to overcome those challenges by implementing the new engineered scrubbing spacer are discussed. The comparison of cement bond evaluation log results of the jobs where conventional spacer systems were used vs. those where the spacer with scrubbing capability was used are also presented, demonstrating the clear difference and improvement.

Well Integrity Enabled by Digital Workflow

2021 ◽  
Author(s):  
B. Brechan (Wellviz) ◽  
A. Teigland ◽  
S. Dale ◽  
S. Sangesland
Keyword(s):  
Fiber Optics ◽  
Risk Level ◽  
Gas Migration ◽  
Digital Workflow ◽  
Well Integrity ◽  
Digital Format ◽  
Standard Procedures ◽  
Safety Margins ◽  
Sustained Casing Pressure ◽  
Casing Pressure

Abstract Emerging technologies are expected to provide step changes in many areas within planning, making and production of wells. The main topic of this paper covers in a digital workflow, where the different disciplines contributions to well integrity are expected to be on a fully digital format. All phases in the lifecycle of wells are integrated into one digital process, where possible improvements are enabled by the transition from a human oriented work process to a software oriented (human supported) process. This transition has taken place in several other comparable energy and capital-intensive industries. Today, some wells have the new fiber optics that enables a range of opportunities for improvement of well integrity. Distributed Acoustic Sensing (DAS) has measurements for every meter, which provides new aspects such as in situ measurements during cement jobs and drilling. Other applications of the new fiber optic technology are monitoring of gas migration, source of sustained casing pressure and other measurements which have the potential to develop into standard procedures or even regulatory requirements. With gas migration, corrosion and other changes affecting the integrity of the well construction, integrity can be re-modelled and updated automatically in a fully digital workflow to understand the safety margins. A part of this digital process is automating the risk level for each well and the entire asset. These processes and the prototype of the automated risk assessment are possible in a fully digital process, where planning and well construction commence with support from modern well planning and integrity software.

Surface Casing Pressure As an Indicator of Well Integrity Loss and Stray Gas Migration in the Wattenberg Field, Colorado

2017 ◽  
Vol 51 (6) ◽  
pp. 3567-3574 ◽  
Author(s):  
Greg Lackey ◽  
Harihar Rajaram ◽  
Owen A. Sherwood ◽  
Troy L. Burke ◽  
Joseph N. Ryan
Keyword(s):  
Gas Migration ◽  
Wattenberg Field ◽  
Well Integrity ◽  
Casing Pressure
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