Downhole fishing tools - Catchall fisher Type YLQ for well clean
Introduction:
1.Purpose and scope of application
catchall fisher is a fishing tool maninly used to fish the tiny litters at the bottom of the well,such as bit bone,cone blocks,manual tools and other debris ect.
2.structure
By the upper joint, the barrel body from the welding.The lower end of the cylinder body is processed into conical teeth.The tube body generally adopts low carbon thin wall tube.The upper connector has a female thread connected to the drill string.In order to ensure the connection strength between the upper joint and the barrel body, the method of drilling the barrel body and welding the joint plug is adopted in addition to welding the insert step.
3. Working principle
After grasping down to the bottom of the well, cover the falling objects at the bottom of the well into the grasping teeth or between the grasping teeth gaps. By relying on the pressure generated by the weight of the drill string, bend and deform the pressure of each grasping tooth, and then make the drill string rotate. The helical tooth shape will be formed by bending and deforming grasping teeth according to its rotation direction.
4. Operation method
The tool is lowered to 1-2m above the bottom of the well, the pump cycle is started, and the upper part of the fish is washed with sand, and then the pump is stopped.Lower the drill string. When the finger weight table shows slightly, check the bottom of the well, lift the drill string and rotate an Angle before lowering it, so as to find the most generous input.After the suspended weight of the finger weight table is restored, add about 10KN of drilling pressure, and rotate the drill string 5-7 turns. After the above operation is completed, lift the drill string from the bottom hole, rotate the drill string to leave the position after rotation, lower and pressurize the drill string 20-30kn, and the deformation will be clamped to death, then the drill string can be lifted.
5. matters needing attention
(1) the shape of grasping teeth should be selected or designed according to the species, and improper selection will cause fishing failure.The material should be low carbon steel to ensure the bending performance of the teeth.
(2) the drill shall be lifted and lowered as gently as possible, and it is not allowed to strike the drill string, so as not to cause the stuck and unsecured, and the fish fall back into the well.
Product spcifications and basic parameters:
| No. | Model | Joint thread type | O.D. mm (in) | Dia. Of the max. litter mm (in) | Dia. Of big steel ball mm (in) | Dia. Of small steel ball mm (in) | Applied borehole(mm) |
| 1 | YLQ-102 | NC26 | 102(4) | 64.5(2 1/2) | 40(1 37/64) | 30(13/16) | 104.8-114.3 |
| 2 | YLQ-114 | NC26 | 114(4 1/2) | 78(3 5/64) | 45(1 25/32) | 35(1 3/8) | 117.5-127 |
| 3 | YLQ-130 | NC31 | 130(5 1/8) | 92.5(3 41/64) | 50(1 31/32) | 40(1 37/64) | 142.9-152.4 |
| 4 | YLQ-146 | NC38 | 146(5 3/4) | 109(4 9/32) | 50(1 31/32) | 40(1 37/64) | 155.6-165.1 |
| 5 | YLQ-159 | NC40 | 159(6 1/4) | 119(4 11/16) | 50(1 31/32) | 40(1 37/64) | 168.2-187.3 |
| 6 | YLQ-178 | 4 1/2REG | 178(7) | 130(5 1/8) | 50(1 31/32) | 40(1 37/64) | 190.5-209.5 |
| 7 | YLQ-200 | NC50 | 200(7 7/8) | 146(5 3/4) | 50(1 31/32) | 40(1 37/64) | 212.7-241.3 |
| 8 | YLQ-219 | NC50 | 219(8 5/8) | 166(6 1/2) | 55(2 5/32) | 45(1 25/32) | 232-260.4 |
| 9 | YLQ-257 | NC56 | 257(10 1/8) | 195.5(7 11/6) | 55(2 5/32) | 45(1 25/32) | 273-295.3 |
| 10 | YLQ-286 | 6 5/8REG | 286(11 1/4) | 229(9) | 55(2 5/32) | 45(1 25/32) | 298.5-327.1 |
