Include Mechanical Stage Collar， Hydraulic Type Stage Collar，Needless Drilling Stage Collar. Stage collars are available in both mechanical and hydraulic versions. However, even the mechanical method of opening and closing requires hydraulic force.

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Description

stage collar

Description of the stage collar

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The grading hoop is also called the grading cementing device, which is mainly used for multi-stage cementing. The holes in the grading hoop can be opened and closed either mechanically or hydraulically. For example, with a grading hoop can be two-stage cement, two-set cement is mainly to solve the cementing quality, such as the target layer pressure is high.The first use of fast-setting cement to solidify the oil and gas layer, to prevent gas channeling. Cement the upper section with a second grade.

Is mainly used to solve the long cementing section concrete problems of high return does not reach the designated position.

Grading cementing is to use a special collar can open and close, in a well cementing job into secondary or tertiary is complete, the special collar collar called points (or band) classification. The main reason for adopting the method of graded cementing is that too much cement is required to be injected at one time. Annular cement column is too long, there is too large hydrostatic column pressure difference or the formation can not bear the liquid column pressure of long section cement column; An upper layer needs to be sealed with cement that is not contaminated by mud; When there is a sealing layer above and below, but no cement sealing is required in the middle; There are gas layers below to prevent excessive weightlessness and other reasons.

Grading ring principle:

1, the original state: the inner sleeve seal cementing hole;

2. Open the plug and cut the lower inner sleeve pin, exposing the hole;

3. At the end of cementing, close the plug to displace the cement slurry, cut off the inner sleeve pin, expose the hydraulic hole, and hydraulically push the closing sleeve to permanently close the cementing hole.