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Search Petrowiki: Balanced plug
...Glossary:Balanced plug A cement ...plug, set with no downhole flow conditions, which allows temporary or permanent shut-off in a well. It t...
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...A cement plug, set with no downhole flow conditions, which allows temporary or permanent shut-off in a well. It t...
- Information Technology > Knowledge Management (0.40)
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...icide * Glossary:Baffles * Glossary:Bail * Glossary:Bailer * Glossary:Balance point * Glossary:Balanced plug * Glossary:Balancing agreement * Glossary:Ball * Glossary:Ball catcher * Glossary:Ball diverter...ry:Bar-vent * Glossary:Barefoot completion * Glossary:Barge * Glossary:Barite * Glossary:Barite plug * Glossary:Barium sulfate * Glossary:Barrel * Glossary:Barrel equivalent * Glossary:Barrel pump...:Black oil * Glossary:Blaine fineness * Glossary:Blank * Glossary:Blank off * Glossary:Blanking plug * Glossary:Blast joint * Glossary:Blasting cap * Glossary:Bleed off * Glossary:Bleeding core *...
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... Contents * 1 Dump bailer * 2 Coiled tubing (CT) * 3 Bullheading or bradenhead placement * 4 Balanced plugs * 5 References * 6 Noteworthy papers in OnePetro * 7 External links * 8 See also Dump ba...ften placed below the desired plugging location to provide a solid bottom in the wellbore: * Limit plug * Cement basket * Permanent bridge ...plug * Sand pill The dump bailer, containing a measured quantity of plugging material, is lowered to t...
Remedial cementing is performed to correct problems associated with the primary cementing job. This article describes some common techniques for placing the cement in the correct location to correct the problem. These techniques are described in basic terms; they can be custom-designed for specific situations, and depend upon the type of remedial cementing operation being undertaken. Dump bailers are used for placing very small volumes of plugging material precisely and economically. Different types of dump bailers, including gravity and positive-displacement bailers, are shown inFigure 1.
- Well Drilling > Casing and Cementing (1.00)
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- Well Completion > Well Integrity > Zonal isolation (0.33)
- Well Drilling > Pressure Management > Well control (0.32)
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...eze * 1.1.4 Low-pressure squeeze * 1.1.5 Packer/retainer squeeze * 1.1.6 Bradenhead squeeze * 2 Plug cementing * 2.1 Factors to consider for a ...plug job * 2.2 Application of plugging * 2.2.1 Abandonment * 2.2.2 Directional drilling/sidetracking ...nt into all voids. Mostcoiled-tubing (CT) squeeze applications are performed using this technique. Plug cementing In oil-gas-well construction, a ...
Remedial cementing is undertaken to correct issues with the primary cement job of a well. Remedial cementing requires as much technical, engineering, and operational experience, asprimary cementing but is often done when wellbore conditions are unknown or out of control, and when wasted rig time and escalating costs have the potential to force poor decisions and high risk. Good planning and risk assessment is the key to successful remedial cementing. Bradenhead squeeze * 2 Plug cementing * 2.1 Factors to consider for a plug job * 2.2 Application of plugging * 2.2.1 Abandonment * 2.2.2 Directional drilling/sidetracking * 2.2.3 Lost-circulation control * 2.2.4 Well control * 2.2.5 Zonal isolation/conformance * 2.2.6 Formation testing * 2.2.7 Wellbore stability * 3 References * 4 Noteworthy papers in OnePetro * 5 External links * 6 See also Squeeze cementing is a "correction" process that is usually only necessary to correct a problem in the wellbore. Before using a squeeze application, a series of decisions must be made to determine * If a problem exists * The magnitude of the problem * If squeeze cementing will correct it * The risk factors present * If economics will support it.
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...ir operations. Remedial cementing operations consist of two broad categories: squeeze cementing and plug cementing. In general, there are five steps required to obtain successful cement placement and mee...re/High-Temperature Wells * 3 Remedial Cementing * 3.1 Squeeze Cementing * 3.2 Techniques * 3.3 Plug Cementing * 3.4 Placement Techniques * 4 Hole Preparation * 4.1 Standoff * 4.2 Circulability Tr...ance Testing * 11.2 Diagnostic Testing * 12 Cementing Hardware * 12.1 Floating Equipment * 12.2 Plug Containers * 12.3 Cementing Plugs * 12.4 Multiple-Stage Cementing Tools * 12.5 Casing Centralize...
Remedial cementing requires as much technical, engineering, and operational experience, as primary cementing but is often done when wellbore conditions are unknown or out of control, and when wasted rig time and escalating costs force poor decisions and high risk. Squeeze cementing is a "correction" process that is usually only necessary to correct a problem in the wellbore. Before using a squeeze application, a series of decisions must be made to determine (1) if a problem exists, (2) the magnitude of the problem, (3) if squeeze cementing will correct it, (4) the risk factors present, and (5) if economics will support it. Most squeeze applications are unnecessary because they result from poor primary-cement-job evaluations or job diagnostics. Squeeze cementing is a dehydration process. A cement slurry is prepared and pumped down a wellbore to the problem area or squeeze target. The area is isolated, and pressure is applied from the surface to effectively force the slurry into all voids. The slurry is designed specifically to fill the type of void in the wellbore, whether it is a small crack or micro-annuli, casing split or large vug, formation rock or another kind of cavity. Thus, the slurry design and rate of dehydration or fluid loss designed into the slurry is critical, and a poor design may not provide a complete fill and seal of the voids.
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...and frame load (see the section onRod Load below). Separable compressors are usually arranged in a balanced-opposed configuration characterized by an adjacent pair of crank throws that are 180 degrees out of...ase and separated by only a crank web. The cranks are arranged so that the motion of each piston is balanced by the motion of an opposing piston. Integral compressors typically have compressor and engine-pow...ft. Cylinders in integral compressors are usually arranged on only one side of the frame (i.e., not balanced-opposed). Cylinder The cylinder is a pressure vessel that contains the gas in the compression cy...
Reciprocating compressors are positive displacement machines in which the compressing and displacing element is a piston having a reciprocating motion within a cylinder. Single-acting cylinder (crank end) * 3.4.3 Auxiliary pump (optional) * 8.3.3 Prelube pump (Optional) * 8.3.4 Oil cooler * 8.3.5 Oil filters * 8.3.6 Overhead tank * 8.3.7 Piping * 8.4 Cylinder and packing lubrication * 9 Nomenclature * 10 References * 11 Noteworthy papers in OnePetro * 12 External links * 13 See also The high-speed category also is referred to as "separable," and the low-speed category also is known as "integral." The American Petroleum Institute (API) has produced two industry standards, API Standard11P and API Standard 618, which are frequently employed to govern the design and manufacture of reciprocating compressors. The term "separable" is used because this category of reciprocating compressors is separate from its driver. Either an engine or an electric motor usually drives a separable compressor. Often a gearbox is required in the compression train. Operating speed is typically between 900 and 1,800 rpm. Separable units are skid mounted and self-contained. They are easy to install, offer a relatively small initial cost, are easily moved to different sites, and are available in sizes appropriate for field gathering--both onshore and offshore. However, separable compressors have higher maintenance costs than integral compressors.
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...d to damage the upstream end of the core, whereas filtrates with slow precipitation rates tended to plug the downstream end of the core or not ...plug the core at all. The composition of the cement played an important role in determining both the qua...oration tunnel of all disaggregated rock and liner debris. Any remaining debris in the tunnel could plug gravel packs during production. Even clean perforation tunnels show a narrow region of reduced perm...
When cement is bullheaded into the annulus to displace mud, the differential pressure between the cement and the formation fluid can lead to a significant loss of cement filtrate into the formation. If, however, large volumes of cement filtrate invade the rock, the possibility of formation damage exists. Depending on the specific composition of the cement and its pH, the filtrate may be supersaturated with calcium carbonate and calcium sulfate. As the cement filtrate invades the formation and reacts with the formation minerals, its pH is reduced from 12 to a pH buffered by the formation minerals. This rapid change in pH can result in the formation of inorganic precipitates such calcium carbonate and calcium sulfate. Evidence of formation damage induced by cement filtrates has been clearly demonstrated in experimental studies presented in Cunningham and Smith[1]and Jones,et al.[2].
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... operations. Remedial cementing operations consist of two broad categories: * Squeeze cementing * Plug cementing Cement placement procedures In general, there are five steps required to obtain succes... these factors will be determined during drilling. The density of the drilling fluids in a properly balanced drilling operation can be a good indication of the limitations of the wellbore. To maintain the in...
Cement is used to hold casing in place and to prevent fluid migration between subsurface formations. Cementing operations can be divided into two broad categories: primary cementing and remedial cementing. The objective of primary cementing is to provide zonal isolation. Cementing is the process of mixing a slurry of cement, cement additives and water and pumping it down through casing to critical points in the annulus around the casing or in the open hole below the casing string. Zonal isolation is not directly related to production; however, this necessary task must be performed effectively to allow production or stimulation operations to be conducted.
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