Cement plugs are used for various reasons, including
•Solving a lost-circulation problem during drilling operations by spotting a cement plug across the thief zone and then drilling back through the plug;
•Plugging a zone or abandonment of a well by sealing off selected intervals, a dry hole or a depleted well;
•Sidetracking or to initiate directional drilling to help guide the drill bit in the desired direction;
•Provide an anchor for an openhole test, particularly when the zone to be tested is significantly off bottom
•Other remedial work
It is essential to these operations that a competent cement plug is placed the first time. Properly placing the designed cement plug helps reduce nonproductive rig time, minimize wasted material, and mitigate the need for additional cementing services.
Plugging oil or gas wells is a very common operation. When required, plugs are designated for a specific place in the well though usually not at the bottom of the wellbore. Thus, the challenge is placing a relatively small amount of cement slurry above a larger volume of wellbore fluid. As a result, a sound engineering design that addresses the major factors affecting plug success is necessary. Factors include the density and rheology of both the cement and the wellbore fluid as well as hole size and hole angle including vertical, deviated and horizontal well orientations. The goal is to secure a seal and leave the top of cement in the location required to address the reason for the plug in the first place. Creating an artificial bottom may be required to effectively spot the plug.
Plug Setting Aids
The CST™ cement support tool, tubing release tool (TRT), bottomhole kickoff assembly (BHKA) disconnect tool, and bottomhole kickoff assembly (BHKA) tool system were designed to aid in setting balanced and competent cement plugs during remedial and primary cementing operations. These tools, when used with cementing best practice applications, can help to improve the attempts to get a proper cement plug set the first time without the need for additional plugs. These tools are available to order through your nearest Halliburton sales office or field camp. Additional application information and product data can be supplied upon request. The following Matrix can help you select which tool can offer the most benefit for your cement plugging operations.
PlugCem™ Cement
Designed to form an effective cement plug in either cased or open hole intervals
With Tuned Cementing Solutions™ cementing systems, Halliburton has created a set of innovative fit-for-purpose solutions with the flexibility required to allow each system to be tuned specifically for a given set of wellbore conditions. PlugCem cements form one of these families of fit-for-purpose solutions.
With PlugCem cement you receive a conventional cementing solution designed to form an effective cement plug in either cased or open hole intervals using specially tuned systems. PlugCem systems are ideal for temporary and permanent abandonment plugs, lost circulation, or kickoff and whip-stock plugs.
PlugSeal™ Cement
Designed to form an effective cement plug in either cased or open hole intervals
With Tuned Cementing Solutions™ cementing systems, Halliburton has created a set of innovative fit-for-purpose solutions with the flexibility required to allow each system to be tuned specifically for a given set of wellbore conditions. PlugSeal cements form one of these families of fit-for-purpose solutions.
With PlugSeal cement you receive a foamed cementing solution designed to form an effective cement plug in either cased or open hole intervals using specially tuned systems. PlugSeal systems are ideal for temporary and permanent abandonment plugs, lost circulation, or kickoff and whip-stock plugs. PlugSeal cement can provide the additional benefits of increased compressibility, bridging, and elasticity gained through the introduction of stable, well-dispersed small N2 bubbles.
For more specifications:
http://www.halliburton.com/en-US/ps/cementing/cementing-solutions/plug-cementing/default.page?node-id=he9pzfig
•Solving a lost-circulation problem during drilling operations by spotting a cement plug across the thief zone and then drilling back through the plug;
•Plugging a zone or abandonment of a well by sealing off selected intervals, a dry hole or a depleted well;
•Sidetracking or to initiate directional drilling to help guide the drill bit in the desired direction;
•Provide an anchor for an openhole test, particularly when the zone to be tested is significantly off bottom
•Other remedial work
It is essential to these operations that a competent cement plug is placed the first time. Properly placing the designed cement plug helps reduce nonproductive rig time, minimize wasted material, and mitigate the need for additional cementing services.
Plugging oil or gas wells is a very common operation. When required, plugs are designated for a specific place in the well though usually not at the bottom of the wellbore. Thus, the challenge is placing a relatively small amount of cement slurry above a larger volume of wellbore fluid. As a result, a sound engineering design that addresses the major factors affecting plug success is necessary. Factors include the density and rheology of both the cement and the wellbore fluid as well as hole size and hole angle including vertical, deviated and horizontal well orientations. The goal is to secure a seal and leave the top of cement in the location required to address the reason for the plug in the first place. Creating an artificial bottom may be required to effectively spot the plug.
Plug Setting Aids
The CST™ cement support tool, tubing release tool (TRT), bottomhole kickoff assembly (BHKA) disconnect tool, and bottomhole kickoff assembly (BHKA) tool system were designed to aid in setting balanced and competent cement plugs during remedial and primary cementing operations. These tools, when used with cementing best practice applications, can help to improve the attempts to get a proper cement plug set the first time without the need for additional plugs. These tools are available to order through your nearest Halliburton sales office or field camp. Additional application information and product data can be supplied upon request. The following Matrix can help you select which tool can offer the most benefit for your cement plugging operations.
PlugCem™ Cement
Designed to form an effective cement plug in either cased or open hole intervals
With Tuned Cementing Solutions™ cementing systems, Halliburton has created a set of innovative fit-for-purpose solutions with the flexibility required to allow each system to be tuned specifically for a given set of wellbore conditions. PlugCem cements form one of these families of fit-for-purpose solutions.
With PlugCem cement you receive a conventional cementing solution designed to form an effective cement plug in either cased or open hole intervals using specially tuned systems. PlugCem systems are ideal for temporary and permanent abandonment plugs, lost circulation, or kickoff and whip-stock plugs.
PlugSeal™ Cement
Designed to form an effective cement plug in either cased or open hole intervals
With Tuned Cementing Solutions™ cementing systems, Halliburton has created a set of innovative fit-for-purpose solutions with the flexibility required to allow each system to be tuned specifically for a given set of wellbore conditions. PlugSeal cements form one of these families of fit-for-purpose solutions.
With PlugSeal cement you receive a foamed cementing solution designed to form an effective cement plug in either cased or open hole intervals using specially tuned systems. PlugSeal systems are ideal for temporary and permanent abandonment plugs, lost circulation, or kickoff and whip-stock plugs. PlugSeal cement can provide the additional benefits of increased compressibility, bridging, and elasticity gained through the introduction of stable, well-dispersed small N2 bubbles.
For more specifications:
http://www.halliburton.com/en-US/ps/cementing/cementing-solutions/plug-cementing/default.page?node-id=he9pzfig
