What are the main remedial cementing techniques?
The following techniques are the six commonly recognized squeeze applications.
- Running squeeze.
- Hesitation squeeze.
- High-pressure squeeze.
- Low-pressure squeeze.
- Packer/retainer squeeze.
- Bradenhead squeeze.
What is remedial cementing?
1. n. [Well Workover and Intervention] Cementing operations performed to repair primary-cementing problems or to treat conditions arising after the wellbore has been constructed. The two main categories of remedial cementing include squeeze cementing and the placement of cement plugs.
What is a cement squeeze job?
Squeeze job, or squeeze cementing is a term often used in the oilfield to describe the process of injecting cement slurry into a zone, generally for pressure-isolation purposes.
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 are downhole cementing tools?
Definition – What does Downhole Tools mean? Downhole Tools are pieces of oilfield equipment that are used during well drilling, completion and intervention or well workover activities and helps the oil well in optimizing the production levels and maintain a continuous flow from a reservoir.
What is a DV tool in oilfield?
Stage-cementing tools, or differential valve (DV) tools, are used to cement multiple sections behind the same casing string, or to cement a critical long section in multistages.
What is Class G cement?
Class G cements are sulfate-resistant Portland cements with different setting time requirements and have a common field of use in the oil industry. Compared to other American Petroleum Institute class cements, Class G has a utilization of more than 95% worldwide in oil well applications.
What is a DV tool?
What are DV tools?
What is stage tool?
Summit Stage Tools are intended to allow cementing of wells in multiple stages, specifically in cementing applications where high hydrostatic pressure could fracture a formation.
What is Class N cement?
Classes of Cement – Strength Gain Each grade consists of 3 classes which describe the speed at which the concrete made from them gains strength: R = early strength gain. N = normal strength gain. L (or S) = low/slow strength gain.
What is the best remedial cementing method?
Good planning and risk assessment is the key to successful remedial cementing. Squeeze cementing is a “correction” process that is usually only necessary to correct a problem in the wellbore.
What is remedial squeeze cementing?
In this type of remedial cementing job procedure, we are forcing the slurry through openings in the casing or casing liner (One of Types Of Casing ). In this article, we will discuss in details the remedial squeeze cementing job techniques as hesitation, bradenhead squeeze, design & cement retainer procedure.
How to repair a primary casing cementing operation?
To repair a primary casing cementing Operations job by circulation / squeezing cement through csg perforations made specifically for this purpose, separated by a (retrievable) packer. In a leaking liner lap, we usually squeeze cement from the top when injectivity can be established.
When do you use a cement injection molding technique?
This technique is often applied when the problem occurs during drilling (lost circulation) or soon after a primary cement job (weak casing shoe).