Linear and vibrational impact generating combination tool with adjustable eccentric drive

A method of fishing to remove a stuck object from a well-bore, comprising:

• attaching a combination impact tool, said a combination impact tool attached to a fishing tool, to one end of a length of coil tubing which is wound around a drum to form a fishing combination;
• reeling the coil tubing from the drum with a drive motor down into a well-bore;
• operating the combination impact tool to generate a combination of linear and vibrational impacts and transferring the generated impacts to the object,
• dislodging said object by application of transferred linear and vibrational impacts;
• operating the coil tubing cause the fishing tool to grasp the object, wherein
• both the linear hammering impacts and vibrational impacts are generated by pressurized fluid flowing through the combination impact tool, wherein
• flow of pressurized fluid through an upper section of the combination impact tool causes a hammer bit to generate linear hammering impacts, and wherein frequency of said linear hammering impacts is controlled by varying pressure of the pressurized fluid flowing through the upper section, and
• flow of pressurized fluid through a lower section of said tool induces an eccentric arm included in the lower section to rotate and cause vibrational impacts, wherein the eccentric arm includes slots for weights to be added to it and wherein the frequency and amplitude of said vibrational impacts can be controlled by varying weight of the eccentric arm and by varying pressure of the pressurized fluid flowing through the lower section and fishing the object by reeling up the coiled tubing.

A combination impact tool for generating a combination of linear hammering and vibrational impacts, said combination impact tool comprising:

• an upper section and a lower section, wherein
• both the linear hammering impacts and vibrational impacts are generated by pressurized fluid flowing through the combination impact tool, wherein
• flow of pressurized fluid through an upper section of the combination impact tool causes a hammer to repeatedly strike an anvil, by placement of at least one spring which forces the hammer away from the anvil after each strike, and thereby generate linear hammering impacts, and wherein frequency of said linear hammering impacts is controlled by varying pressure of the pressurized fluid flowing through the upper section, and
• flow of pressurized fluid through a lower section of said tool induces an eccentric arm included in the lower section to rotate and cause vibrational impacts, wherein the eccentric arm includes slots for weights to be added to it and wherein the frequency and amplitude of said vibrational impacts can be controlled by varying weight of the eccentric arm and by varying pressure of the pressurized fluid flowing through the lower section.