CN2383966Y

CN2383966Y - Mechanical up-hammer

Info

Publication number: CN2383966Y
Application number: CN 99218247
Authority: CN
Inventors: 贾云翔; 任志刚; 刘合; 金岩松
Original assignee: No4 Oil Prodn Plant Daqing Petroleum Administration
Current assignee: No4 Oil Prodn Plant Daqing Petroleum Administration
Priority date: 1999-07-23
Filing date: 1999-07-23
Publication date: 2000-06-21
Anticipated expiration: 2009-07-23

Abstract

The utility model relates to a mechanical top jar for the matching salvage of an oil field well, which makes underground falling objects jolted for convenient salvage. The utility model has the advantages of simple structure and low cost. A joint (1) at the lower end of a descent drill is connected with a barrel type elastic claw (4) which has a same outside diameter with the joint through screws; the lower end of the elastic claw (4) is upwards inserted and matched with a spindle (3) with a central hole; a bulge loop shoulder (7) shocked with the inner ring end (10) of the upper end of the elastic claw is arranged on the spindle; a coupling head (8) connected with a fishing tool is arranged on the spindle; the lower end of the elastic claw is provided with an opening matched with a forming conical surface (9) of a bushing 5 forming a screwed connection with a step of a forming interface (8). When the drill is lifted to pull the elastic claw, the elastic claw suddenly rises along the spindle with the joint (1), the ring end (10) and the bulge loop shoulder (7) generate jolt which is downwards transferred to the underground falling objects.

Description

The mechanical type top jar

The utility model relates to the oil field well and salvages the mechanical type top jar that trouble of lost tool in hole and fishing tool are used.

The oil field well is often because of casing deformation, dislocation or sand production in oil, with oil well pump, packer, join instruments " stuck " such as product (water) device in the down-hole, salvages the instrument of these " stuck ", for fear of pulling off oil pipe, often cooperates bumper jar " unfreezing ".Mostly existing jarring class instrument is hydraulic control, though unfreezing is effective, and its complex structure, the cost height, the maintenance that needs repairing damages the back and is difficult for repairing.

The purpose of this utility model is to avoid the deficiency that exists in the above-mentioned present technology, and provides a kind of simple in structure, the mechanical type top jar that cost is low.

The purpose of this utility model can reach by the following technical programs: the vertical calvus that upwards is divided into spacing in the drilling tool lower end week of going into the well.Up be inserted with the mandrel of band centre bore from this elastic claw lower end, the inwall of end joint is close-fitting bulge loop shoulder under the upper end formation of this mandrel and the drilling tool; The lower end elasticity of extension pawl of mandrel constitutes the threaded connector that links to each other with fishing tool, and ring set is threaded at the step place that forms this connector.The following interruption-forming inner conical surface of above-mentioned elastic claw closes up, with the lower end formation cone match of ring set.

In such scheme, can be at the mandrel jars pad that under bulge loop shoulder, is threaded.By above this bumper jar of forecast scheme configuration, similar telescopic short circuit, under the drilling tool end joint and elastic claw can with on carry drilling tool along moving on the mandrel because drilling tool is longer, is stretched in the process and has laid in certain elastic energy last carrying; When on when lifting power greater than the frictional force between elastic claw and the ring set, elastic claw opens suddenly, and rise rapidly with the top drilling tool, produce bump suddenly between ring end and the jars pad in the connection of thread of elastic claw upper end, pass to trouble of lost tool in hole by mandrel and fishing tool, make junk be subjected to jarring, can realize this purpose.

The utility model is compared with above-mentioned present technology can have following advantage: shown in accompanying drawing, it is simple in structure, and cost is low, and easy-maintaining, ram are all easily changed.

Accompanying drawing is a half sectional view of the present utility model.

To be further described the utility model below in conjunction with accompanying drawing:

Shown in accompanying drawing, end joint under the drilling tool of going into the well [1] is threaded with the cartridge type elastic claw [4] of external diameter, and elastic claw is a cylindrical shell, at the vertical calvus [6] that upwards is divided into spacing its lower end week; The upper end is threaded with joint [1], at inside formation ring end face [10], up is seated the mandrel [3] that cooperates and be with centre bore from this elastic claw [4] lower end, and the upper end of mandrel [3] forms and the inwall of joint [1] is a close-fitting bulge loop shoulder [7]; The lower end elasticity of extension pawl [4] of mandrel [3] constitutes the threaded connector [8] that links to each other with fishing tool, and ring set [5] is threaded at the step place that forms this connector [8].The following interruption-forming inner conical surface of above-mentioned elastic claw closes up, and forms the conical surface [9] with the lower end of ring set [5] and cooperates.

In such scheme, the jars pad [2] that can be threaded under mandrel [3] and bulge loop shoulder [7] is convenient to after breaking change.

Claims

1, a kind of oil field well that relates to cooperates fishing tool to salvage the mechanical type top jar of trouble of lost tool in hole, is forming between end joint [1] and the fishing tool under the drilling tool of going into the well, and it is characterized in that:

A, the cartridge type elastic claw [4] that is threaded on joint [1] are at the vertical calvus [6] that upwards is divided into spacing its lower end week;

B, up be inserted with the mandrel [3] of band centre bore from elastic claw [4] lower end, the inwall that the upper end of mandrel [3] forms with joint [1] is a close-fitting bulge loop shoulder [7]; The lower end elasticity of extension pawl [4] of mandrel [3] constitutes the threaded connector [8] that links to each other with fishing tool, and ring set [5] is threaded at the step place that forms this connector [8];

The following interruption-forming inner conical surface of c, elastic claw [4] closes up, and forms the conical surface [9] with the lower end of ring set [5] and cooperates.

2, top jar according to claim 1 is characterized in that: jars pad [2] can be threaded under mandrel [3] and bulge loop shoulder [7].