Variable OD coiled tubing strings

Coiled tubing comprising a first end spaced-apart from a second end and an intermediate portion between the first end and the second end,

• the coiled tubing having a first outer diameter at the first end, a second outer diameter at the second end, and
• a third outer diameter at the intermediate portion, and
• outer diameter of the coiled tubing continuously varying from the first end to the intermediate portion.

The coiled tubing of cliam 6 wherein the first outer diameter is greater than the third outer diameter.

The coiled tubing of cliam 6 wherein the third outer diameter is greater than the second outer diameter.

The coiled tubing of cliam 5 wherein outer diameter of the coiled tubing continuously varies from the intermediate portion to the second end.

A method for snubbing coiled tubing into a wellbore extending from earth surface down into the earth, the method comprising

• introducing coiled tubing into the wellbore, the coiled tubing comprising the coiled tubing having a first outer diamter at the first end and a second outer diameter at the second end, the first outer diameter larger than the second outer diameter, and outer diameter of the coiled tubing continuously diminishing from the first end to the second end, and
• the method including introducing the second end first into the wellbore.

A method for producing a fluid from a wellbore, the wellbore extending down from an earth surface into the earth, the fluid containing gas and liquid, the method comprising

• installing coiled tubing in the wellbore, the coiled tubing comprising the coiled tubing having a first outer diamter at the first end and a second outer diameter at the second end, the first outer diameter larger than the second outer diameter, and outer diameter of the coiled tubing continuously diminishing from the first end to the second end, and
• the second end below the first end in the wellbore.

A method for producing a fluid from a wellbore, the wellbore extending down from an earth surface into the earth, the fluid containing gas and liquid, the method comprising

• installing coiled tubing in the wellbore, the coiled tubing comprising the coiled tubing having a first outer diamter at the first end and a second outer diameter at the second end, the first outer diameter larger than the second outer diameter, and outer diameter of the coiled tubing continuously increasing from the first end to the second end, and
• the second end below the first end in the wellbore.

A method for introducing fracturing treatment material into an earth formation, the method comprising

• pumping a fluid with fracturing treatment material down into a tubular string extending down from an earth surface into an earth formation, the string having a first portion with a first diameter at the earth surface and a second portion with a second diameter at a portion of the string within the earth formation, the string having a continuously varying diameter from the first portion to the second portion, the first diameter larger than the second diameter, and
• reducing velocity of the fluid with fracturing treatment material by flowing it from the first portion of the string to the second portion of the string.

Any patentable invention disclosed herein.