Fish bone shaped lateral well drilling and completion technique

Abstract

The invention relates to a technique method for the completion of fishbone branch well drilling. The technique method comprises the following steps: after an uncased hole hanger and a tail pipe are put down after the completion of a main well bore, a plurality of branch window whipstocks and windowing tools are put down one by one; each branch well bore is drilled respectively, the uncased hole hanger and a completion pipe column are put down to complete drilling and finally the tail pipe is suspended at a technical bushing through a hanging-up packer in pipe. The method has the advantages that: the reducing of the size of the main well bore of the fishbone branch well completed by the method, which is caused by the branch well bore does not occur, the number of the branch well bore is not limited and the bare area of the oil coat can be increased to the greatest extent. The method can drill fishbone branch wells at any type of oil coat, and cold production and thermal production can be carried out to the completed branch well; as all the well bores are put down with sieve pipes to fulfill well completion, the service life of the branch well can be prolonged.

Description

Technical field:

[0001] The invention relates to a process for oil drilling, especially branch well drilling and completion, which belongs to the oil drilling process technology category. Background technique:

[0002] With the development of oil drilling and oil field development technology, the scale of popularization and application of branch well drilling and oil recovery is expanding day by day. Among them, the fishbone branch well has become one of the important technologies for crude oil production at home and abroad because of its high single well oil production and low crude oil production cost. At present, the branch well drilling method used in the field is usually to drill the branch wellbore by running a deflector in the casing of the main wellbore and then opening a window to side-drill the branch wellbore after drilling the main wellbore. diameter, and because the main wellbore is a horizontal well, it is also difficult to mount the deflector, which reduces t...

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