Oil Well Cementing Tool Dual Plug BTC Double Plug Cementing Head
With Factory Oilfield Tool
1) Description
Cementing head is a device fitted to the top joint of a casing
string to hold a cement plug before it is pumped down the casing
during the cementing operation.
2) How to work for Double Plug Cementing Head
In most operations, a bottom plug is launched before the spacer of
cement slurry. The top plug is released form the cement head after
the sapcer fluid. Most cement heads can hold both the top and
bottom plugs. A manifold incorporated into the cement head assembly
allows connection of a fluid circulation line.
3) Charateristics of Double Plug Cementing Head
1. Compact, easy to connect
2. Indicator monitoring stopper running
3. Body and short sleeve button connected by ladders
4. High strength materials and high thread to ensure it meets
quality and performance requirements
5. Manifold connections, as required by the selection union.
Cementing head is a manifold system that is installed on the top of
the casing which allows the cement slurry to be pumped from the
cement unit down any of the type of casing string. The cement head
is also used for releasing the top and bottom cement plugs.
A “cement head” is screwed into the top casing collar or landing
joint, depending on the type of casing cementing job. The discharge side of the downhole pump and the cement head are
connected by a series of articulated or straight sections of
high-pressure steel pipe, also known as “treating iron”
Double plug cementing head
Heads capable of storing multiple plugs are preferred over those
just carrying single plugs for operational convenience, as the use
of more than one plug requires the opening of the head to insert a
second (or even a third) plug after circulating the drilling fluid
and launching the bottom plug. This allows not only the build-up of
gels in the annulus, having an adverse effect on fluid displacement
efficiency, but also cement-free fall. The risk of sticking the
casing (pipe sticking) is also increased if reciprocation is
stopped to allow the insertion of the additional plug (or two).
| size mm | working pressure mpa | ID mm | Max plug length 1 mm | Max plug length 2 mm | stop pin type | casing thread no |
| 101 | 35,50 | 88-90 | ≥240 | ≥300 | single | 4TBG |
| 114 | 97-103 | ≥240 | ≥300 | single | 4-1/2 LCSG, 4-1/2 BCSG |
| 127 | 108-116 | ≥260 | ≥400 | single | 5LCSG, 5BCSG |
| 140 | 119-126 | ≥260 | ≥400 | single | 5-1/2 LCSG,5-1/2 BCSG |
| 178 | 21,35 | 155-162 | ≥290 | ≥450 | single and double | 7 LCSG, 7 BCSG |
| 194 | 168-177 | ≥310 | ≥450 | single and double | 7-5/8 LCSG, 7-5/8 BCSG |
| 219 | 194-201 | ≥310 | ≥500 | single and double | 8-5/8 LCSG, 8-5/8 BCSG |
| 244 | 220-225 | ≥330 | ≥550 | single and double | 9-5/8 LCSG, 9-5/8 BCSG |
| 273 | 14,21 | 248-255 | ≥360 | ≥550 | double | 10-3/4 LCSG, 10-3/4BCSG |
| 298 | 274-279 | ≥360 | ≥550 | double | 11-3/4 LCSG, 11-3/4 BCSG |
| 340 | 313-320 | ≥410 | ≥600 | double | 13-3/8 LCSG, 13-3/8 BCSG |
| 508 | 476-286 | ≥510 | ≥650 | double or triple | 20 LCSG,20 BCSG |
NOTE: 公称尺寸- SIZE; 工作压力-WORKING PRESSURE ; 内径-ID ；可容胶塞长度-Max plug
length; 挡销形式: stop pin type ;套管螺纹代号:casing thread no;
