Releasing And Reversing Overshots - China

Type DLT-T Releasable Reversing Overshot, a new type of

fishing tool, has many advantages owned by various overshot,

box tap and the like, Its distinguishing features are as

follows: to unscrew and recover the stuck fish: To release

the fish down hole if necessary, to circulate the washing

fluid as one of the accessories for reversing tools, it is

widely used in well servicing.

Structure and application

Is consisting of top sub, spring, bowl, retaining seat,

slip, control key, seal ring, seal seat, guide and so on.

The upper end of top sub is connected with other tools and

drill tool: The lower end of top sub is connected with bowl

equipped with spring in the interior, There are three control

keys uniformly distributed in the inner wall of the upper

end of bowl, the control keys are used to control the

position of retaining seat, Three keys are inserted

separately in three grooves in the tapered interior section

of lower end in bowl where three keys are used to transmit

torque, The tapered interior section produces a pinch force

against the slip to effect the fishing operation.

The

reversed operation can be effected when three keys transfer

the torque from bowl to slip.

The inclined angle among three

control keys play an important role in retaining of slip

conforming with bowl to ensure that the tools can be

released easily from fish.

The retaining seat is installed at the upper end of external

bowl where three keys are placed, the retaining seat not

only can slide axially but also rotate round axial line so

as to move with slip which is installed in internal circular

recess.

Specifications - Releasing and Reversing Overshot

Model

O.D.

(mm)

Catch size

Allowable Pulling Force

(KN)

Start Pulling Force and Torque

ThreadConn.

(LH)

Tensile Force (KN)

Torque (N.

m)

DLT-T48

95

47.0-49.3

250

117.7

3089

2 7/8 REG

DLT-T60

105

59.7-61.3

350

147.1

5737

2 3/8 IF (NC26)

DLT-T73

114

72.0-74.5

420

176.5

7750

2 7/8 IF (NC31)

DLT-T89

134

88-91

500

10233

3 1/2 IF (NC38)

DLT-T102

145

101-104

700

196

11032

DLT-T114

160

113-115

890

12151

DLT-T127

185

126-129

1200

235

13483

4 1/2 IF (NC50)

DLT-T140

200

139-142

1500

15298

Company Contact:

• Posted By: Tianhe Oil

• Phone: 00862131150073

• Address: No.2999 Xinyang Road,Fengxian District, Shanghai , China

• Email:

• Website: http://www.tianheoil.com

• Business Description: Tianhe Oil Group is a comprehensive enterprise of equipment
  
  manufacturing and oilfield service providing.
  
  The company is specialized
  
  in innovation, manufacture and sales of drill and petroleum extraction
  
  tools, equipments and oil field services.
  
  Tianhe Oil Group is the council member of CPEIA (China Petroleum and Equipment Industry Association), rewarded as national level of Hi Tech enterprise.
  
  The company is a Chinese well known trademark enterprise.
  
  It has been certified to ISO, API, NS 1, and HSE management system.
  
  The company has developed a strong domestic sales network covering all oilfields of CNPC, SINOPEC and CNOOC.
  
  Currently, our products and equipments have been exported to 45 countries, overseas business has covered 80% of our company sales.