FIELD: oil and gas well drilling, particularly for unbalanced productive deposit drilling along with flushing the well with light-weight solutions and gas-and-liquid compositions.
SUBSTANCE: drilling assembly comprises elongated integral-joint flexible pipe, threadedly connected latch pipes and bottomhole tool. The elongated integral-joint flexible pipe is arranged in upper part of drill column between latch pipes and well head. Working part of flexible pipe reeled from drum and supplied into well during drilling operation has length of not less than design length of design unbalanced drilling length.
EFFECT: reduced costs of equipment to be used and increased technological effectiveness of drilling operation.
1 dwg
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