Oil drilling system with drilling fluid in and out

Abstract

The invention provides a petroleum drilling system for inside-input and inside-output type drilling fluid. The petroleum drilling system comprises a drilling derrick, a drilling fluid inlet tank, a drilling fluid pressurization pump, a drilling fluid recovery pump, a drilling fluid recovery tank, a wellhead blowout preventer, a drill rod assembly, a stratum sealing drum and a drill bit, wherein the drill rod assembly comprises a plurality of drill rod units which are sequentially connected; a drill rod clapboard is arranged inside each drill rod unit; the front and rear side edges of each drill rod clapboard are in sealed contact with the inner wall of each drill rod unit; each drill rod clapboard is fixed in each drill rod unit through a clapboard fixing assembly; the drill rod clapboardsarranged in different drill rod units are connected through clapboard connecting assemblies; and the interior of the drill rod assembly is divided into a left drilling fluid output channel and a right drilling fluid input channel by the drill rod clapboards. The petroleum drilling system provided by the invention has the advantages that under the action of the drilling fluid recovery pump and thedrilling fluid pressurization pump, the input and output of the drilling fluid can be completed inside the drill rod assembly so as to avoid massive loss of the drilling fluid, and simultaneously, the drilling fluid is circularly utilized so as to lower the drilling cost.

Description

technical field [0001] The invention belongs to the field of oil drilling and relates to a drilling fluid in-in and in-out oil drilling system. Background technique [0002] The narrow drilling fluid density window is likely to cause wellbore instability, leakage reservoir damage and other drilling complications, which seriously restrict the development speed and economic benefits of oil and gas resources. [0003] The problem caused by the narrow drilling fluid density window has brought great difficulty and risk to the actual construction (the density window refers to the density range of the drilling fluid, and the narrow density window is the density range that the drilling fluid can choose in the process of drilling a certain formation. If the density of the drilling fluid exceeds this range, lost circulation will occur, and if the density of the drilling fluid exceeds this range, the well wall will collapse and lose blocks). The factors affecting the drilling fluid de...

AI Technical Summary

Problems solved by technology

[0002] The narrow drilling fluid density window is likely to cause wellbore instability, leakage reservoir damage and other drilling complications, which seriously restrict the development speed and economic benefits of oil and gas resources

[0003] The problem caused by the narrow drilling fluid density window has brought great difficulty and risk to the actual construction (the density window refers to the density range of the drilling fluid, and the narrow density window is the density range that the drilling fluid can choose during drilling a certain formation. Small, this kind of situation is prone to drilling complex situations, the drilling fluid density exceeds this range and causes lost circulation, and if it is lower than this range, the well wall collapses and blocks)

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