Casing Centralizer

Casing Centralizer

Definition:
Casing centralizer is a mechanical device,installed outside the casing string secured around the casing at various locations to keep the casing from contacting the well bore walls, acts as a righting sleeve in the well bore.
Function:
  • Strengthen the casing, keep the casing centered, and ensure that the annuls cement ring is evenly distributed.　
  • Prevent the casing from sticking in the high permeability formation, ensuring the smooth entry of the casing.
  • Reduce casing penetration and resistance, reduce casing wear, scrape off loose mud cakes, and improve cement and formation quality.
Types:
  • 　　As per action form, it can be divided into Bow Spring centralizer, rigid centralizer and semi-rigid centralizer.
  • 　　As per structure of the righting strip,the elastic centralizer can be divided into single bow centralizer and a double bow centralizer.
  • 　　The rigid centralizer can be divided into ordinary rigid centralizer and roller rigid centralizer.

评论

发表评论

此博客中的热门博文

3 Main Types Of Cement Head

图片
  3 Main Types Of Cement Head How Many Types Of Cement Head Are There In Oilfield Drilling? The answer is 3 . They are  Single Plug Cement head, Double Plug Cement head, Drill Pipe Cement head. First, We Need To Know: What Is Cement Head? Cement Head is a special tool for cement slurry injection and release plug, and it is a device for cementing at the top of casing. One or two cementing rubber plugs can be installed at the same time. The double plug cement head can be used for conventional double plug well cementation, and can be used for continuous double stage cementing operation. What Advantages Of The Cement Head? 1.With quick connection, which could be easily connected on site, and can be connected with the API threads for a wide range of application. 2.Double balance tube structure, in the use of the lower interface for cementing operations, so that the rubber plug up and down at both ends of the same pressure, eliminating the negative pressure shaft...
阅读全文

Cementing Tools Accessories

图片
Cementing Tools Accessories What is Cementing Tools?   This is an article about the Cementing tools accessories basics.It includes all basic info about cementing tool.It is wrote by myself,Maybe there is mistake,It is my pleasure that you point it to me. 　　The cementing wellhead tool accessories refers to a mechanical device that is mounted on the casing for the purpose of solidifying the well during the cementing process.Here, I introduce it in 2 items: Wellhead Cementing Tools Introduction and Downhole Cementing tool introduction Part 1—Cementing Wellhead Tools Cementing wellhead tool includes: 1–Cementing cement head Casing cement head (single plug cement head, double plug cement head) Liner pipe cement head (Kelly Pipe cement head, tubing cement head) Cementing plug (top rubber plug, bottom rubber plug, liner pipe rubber plug). 2–Circulating joint (water hose interface, square drill sweat interface) 3–Water hose connection sub 4–Cementing Manifold 5–Hi...
阅读全文

Two Stage Cementing Collar

图片
Two Stage Cementing Collar 1 .  Structure 6 5/8″(Φ168mm)  Two Stage Cementing Collar  tool mainly consists of two-stage coupling , first-stage plug,shut-off baffle, free-fall opening plug and closing plug. It structure as below drawing. Two-Stage-Cementing-Collar-structure-drawing Two-Stage-Cementing-Collar pictures as below Two-Stage-Cementing-Collar 2. Usage 6 5/8″(Φ168mm) Stage collar is a mechanical tool used to complete the cementing operation into two times. Mainly used in the following circumstances: 1.Excessive injection of cement at one shot. 2. The formation cannot bear the gigantic fluid pressure. 3. Packoff special strata. 4. Avoid the occurrence of annual air channeling after the cementing job. 5. The considerable temperature difference  between the upper and lower section makes it rather difficult to adjust the slurry performance. 3.   Main Features 1. It  uses the inner-closing  structure and  the l...
阅读全文