Why squeeze cementing is used?
The forcing, by pressure, of cement slurry into a specified location in a well, such as channels or perforations, for the purpose of achieving zonal isolation. Squeeze cementing is a remedial cementing technique used to repair flaws in primary cement or damage incurred by corrosive fluids.
What is secondary cementing in drilling?
Any cementing operation after the primary cementing operation. Secondary cementing includes a plug-back job, in which a plug of cement is positioned at a specific point in the well and allowed to set. Wells are plugged to shut off bottom water or to reduce the depth of the well for other reasons.
What is hesitation squeeze?
PetroWiki. A cement squeeze technique where the cement is squeezed into a channel or leak at a low rate, then allowed to sit and dehydrate by leakoff, before again raising the pressure. The action gradually builds a dehydrated cement node that blocks the channel.
What is cement squeeze?
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.
What is squeeze cementing?
How does a cement plug work?
A rubber plug used to separate the cement slurry from other fluids, reducing contamination and maintaining predictable slurry performance. A diaphragm in the plug body ruptures to allow the cement slurry to pass through after the plug reaches the landing collar. …
How can you tell if a concrete plug is balanced?
Balanced Cement Plug Calculation
- Determine volume of cement that you need.
- Determine height of cement and spacer when pipe in hole.
- Determine displace volume to balance the hydrostatic both sides.
- When you pull cement stinger, you will have the balance set properly like this.
What do you need to know about PetroWiki cementing?
Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment. SPE disclaims any and all liability for your use of such content. More information Cementing operations can be divided into two broad categories: primary cementing and remedial cementing.
What is the purpose of the wettability test?
The Wettability Test Apparatus, Model C1001 is designed to evaluate the apparent wettability of spacer fluids, preflush fluids, and spacer and surfactant fluid combinations. Achieving water wettability is important to the success of any cement operation.
What does cementing do to a well casing?
In addition to isolating oil-, gas-, and water-producing zones, cement also aids in (1) protecting the casing from corrosion, (2) preventing blowouts by quickly forming a seal, (3) protecting the casing from shock loads in deeper drilling, and (4) sealing off zones of lost circulation or thief zones.
How is wettability used in an oilfield?
In many oilfield applications, wettability is treated as a binary switch—the rock is either water-wet or oil-wet. This extreme simplification masks the complexity of wetting physics in reservoir rock. In a homogeneous, porous material saturated with oil and water, “strongly