Tension multiplier jar apparatus and method of operation

A jarring apparatus that multiplies tension to provide greater overpull, the apparatus comprising:

• a. an outer tube;
• b. an inner tube moveable within the outer tube, attached at a first upper end to the pipe string;
• c. a third tube between the outer and inner tubes that is engaged to the stuck object;
• d. a compressible energizing fluid, such as nitrogen gas, within a space between the inner and third tubes when the inner tube is raised to a first up cocked position;
• and
• e. a first differential surface area between the inner tube and the third tube and a second differential surface area between the outer tube and inner tube, so that when tension is applied to the inner tube, the tension is multiplied to the outer tube by virtue of the compressible fluid acting on the differential areas, thereby allowing the outer tube to deliver a multiplied jarring force to the stuck object.

A jarring apparatus that multiplies tension to provide greater overpull, the apparatus comprising:

• a. an outer tube;
• b. an inner tube moveable within the outer tube, attached at a first upper end to the pipe string;
• c. a third tube between the outer and inner tubes that is engaged to the stuck object;
• d. raising the inner tube to a first up-cocked position;
• and
• e. compressing a first energizing fluid within a space between the inner and third tubes when the inner tube is raised to the first up-cocked position;
• f. defining a first differential surface area between the inner tube and the third tube;
• g. defining a second differential surface area between the outer tube and the inner tube;
• and
• h. applying tension to the inner tube so that the tension is multiplied to the outer tube by virtue of the compressible fluid acting on the differential areas thereby allowing the outer tube to deliver a multiplied jarring force to the stuck object.

A process for multiplying the force against an object, comprising the following steps:

• providing a compressive inner tube;
• compressing a fluid by upward pull on the inner tube by a long stroke acting on a first piston area;
• and
• allowing the fluid to expand against a second piston area over a relatively short stroke, wherein upon expansion of the fluid the upward force is multiplied by a factor of 1.2 to 15 as a jarring force.

An apparatus for providing up and down jarring to tools within a borehole, comprising:

• a. a first external body section;
• b. a piston rod within the first body section defining a first fluid chamber therebetween;
• c. an internal shaft within a portion of the body section defining a second fluid chamber therebetween;
• d. a compressible fluid housed within said first and second chambers;
• e. means for exerting a compressive force on said first fluid chamber to overcome the compressive force within the second fluid chamber to the extent that the compressive force in the first chamber forces the body section and internal shaft to jar against one another imparting an upward jarring motion to the lodged tool.

An apparatus for providing up and down jarring to tools lodged within a borehole, comprising:

• a. a first external body section;
• b. a piston rod within the first body section defining a first fluid chamber;
• c. an internal shaft within a portion of the body section defining a second fluid chamber;
• d. a compressible fluid housed within said first and second chambers;
• e. means for exerting a compressive force on said second fluid chamber to overcome the compressive force within the first fluid chamber to the extent that the compressive force in the second chamber forces the body section and internal shaft to jar against one another imparting a downward jarring motion to the lodged tool.

A jarring method within a bore hole, comprising the steps of:

• a. providing a tool having a first external body section;
• a piston rod within the first body section defining a first fluid chamber;
• and an internal shaft within a portion of the body section defining a second fluid chamber;
• b. filling the first fluid chamber with a quantity of compressible fluid to provide a fluid pressure within the first fluid chamber;
• c. filling the second fluid chamber with a quantity of compressible fluid to provide a fluid pressure within the second fluid chamber;
• d. compressing the fluid in the first fluid chamber to a pressure exceeding the pressure in the second fluid chamber;
• e. allowing the fluid in the first fluid chamber to expand with a force capable of exerting an upward jarring force between the internal shaft and the body section.

A method of jarring a tool in a bore hole, comprising the steps of:

• a. providing a tool having a first external body section;
• a piston rod within the first body section defining a first fluid chamber;
• and an internal shaft within a portion of the body section defining a second fluid chamber;
• b. filling the first fluid chamber with a quantity of compressible fluid to provide a fluid pressure within the first fluid chamber;
• c. filling the second fluid chamber with a quantity of compressible fluid to provide a fluid pressure within the second fluid chamber;
• d. compressing the fluid in the second fluid chamber to a psi exceeding the psi in the first fluid chamber;
• e. allowing the fluid in the second fluid chamber to expand with a force capable of exerting a downward jarring force between the internal shaft and the body section.

An apparatus for jarring downward by multiplying tension to provide a greater downward force, the apparatus comprising:

• a. an outer housing;
• b. an inner housing;
• c. a tension rod moveable within the inner and outer housings, the tension rod attached at a first upper end to a line;
• d. a spring member positioned within an annular space between the outer and inner tubes extending to a lower anvil member;
• e. a incompressible fluid within a space between the tension rod and the inner housing so that when the tension rod is pulled upward, the incompressible fluid exerts a compression force on the spring member;
• e. means for releasing the tension rod from the raised cocked position to energize the spring with a downward jarring force.