Multi-Cycle Circulating tool/sub
 

1. Multi-Cycle Circulating tools(multi-cycle ball -activated drilling valve,well commander  Circulating tools)
 

The Multi-cycle circulating tools is a sub to provide cycle and cooperate by dropping the ball several times. The operating steps of this tool is to achieve “shift” of product structure by dropping ball operation. It can generate a definite open or close position when dropping.

The drop ball cannot be pumped thru the tool during the cycle open function. 

Advantage:

The Multi-cycle circulating tools is the perfect tool for use in high angle and horizontal wells.
According to the standard, all tools have two large circulating ports which greatly reduce the risk of plugging.
The Multi-cycle circulating tools is the only tool that permits full TFA reverse circulation.
Due to the unique design of the Multi-cycle tool, the flow ports are open before the activating ball reaches the catcher seat, in order to prevent the ball into the process being crushed.
The Multi-cycle circulating tools can be opened in a fixed position when it has run into the well bore.
The Multi-cycle circulatingtools permit open and close at least six times, this number can be increased on request.

Technical specification:

 

Model	OD mm(inch)	Conn.or other
MCCT 4 3/4	(4 3/4)	NC38
MCCT    6 1/2	(6 1/2)	NC50
MCCT      8	8	NC50

 

2.Unlimited circulating valve(NOV)  

3.  MABS Multiple Activation Bypass System
 
Overview:
 
SHARP RAZOR introduces the MABS  Multiple Activation Autolock Bypass System for drilling, completion, workover and thru-tubing operations. 
Originally developed to enable the aggressive pumping of LCM materials and to increase circulation rates for enhanced hole cleaning, the MABS  has evolved to benefit many applications in the drilling, completion, and workover phases of a well such as:
 
Pumping all types of LCM pills, including aggressive pills and cement squeezes 
Increasing circulation rates for improved hole cleaning resulting in reduced torque and drag, thereby increasing ROP 
Increasing annular velocity in highly deviated and horizontal wellbores where removal of cutting beds and hole cleaning are problematic 
Fluid displacements 
Sub-sea riser/BOP jetting 
Acidizing and stimulation treatments 
Coring applications 


4. multiple activation  bypass tools system 

a) Structure composition
SHARP RAZOR multiple activation  bypass tools  that can achieve the unrestricted free conversion between the outside circulation and the normal circulation. Mainly consists of three parts: the shell, the valve element and the spring.   

b) Operating principle
After pitching, the Bypass Valve change the pumping pressure to switch cycle channel and then complete different process tasks.

c). Features/Advantage
 
1). Pitch number：3 pcs
2). Pitch size：can choose according to need
3). The method of cycle conversion for start-up tool: when pitch entered into valve seat,stop pump 30 ~ 90s and start the pump circulation then can start the operation.
4). Pressure range of the circulation mode switching: 1.4MPa～5.6MPa
5). Circulation mode：unrestricted free conversion
6). Special tailor-made：can customize the type of valve core for through logging cable and other cable tool
 
d) Work effect
1). Save the drilling cycle. Pitch conduct plugging operation when leakage of well and the pitch is plugging operations. After plugging, the tool shear pitches and switch to the normal circulation patterns then do normal drilling operation. It save the drilling cycle.
2). Have multiple switch function, can achieve the unrestricted free conversion between the outside circulation and the normal circulation.
3). Open threshold displacement can be selected according to the actual situation.
 
e) The application range
Well leakage
Well repair/well completion
Horizontal well drilling
Acidification and increase production in horizontal wells
Special coring service
Under balanced drilling
The center position of drill string to improve cycle efficiency
 
f) Specification

Model	MAABT121	MAABT165	MAABT203
Tool OD (in.)	43/4＂(121mm)	61/2＂(165mm)	8＂(203mm)
Tool ID (in.))	11/4＂(31.75mm)	2＂(50mm)	2.36＂(60mm)
Tool length (mm)	1100	1200	1300
Tensile load Max.(kN)	2200	5500	7920
Flow rate Max. (L/s)	23	47	65
Flow rate Min. (L/s)	11	23	35
Torsional load Min. (kN·m)	40	68	150
Flow area before the pitch (mm2)	1256	1750	3316.6
Flow area of outside cycle(mm2)	615.4	780	1775.9
Flow area of normal cycle(mm2)	632.5	1260	1358.3
Temperature rating (℃)	150	150	150
Under pressure Max.(MPa)	35	35	35
Pitch diameter (mm)	36、38、40	55、57.5、60	62、63、65
Tool pressure drop in pre start time (rinsing) (MPa)	0.4 (18L/s)	0.6 (28L/s)	0.7 (63 L/s)