A non-stop drilling method for oil field drilling

Abstract

The invention discloses a continuous injection well drilling method for oil field well drilling. According to the continuous injection well drilling method for oil field well drilling, a high-pressurefixed control device used for formation pressure balance and performing sand draining is adopted, and a sleeve-type drilling rod is adopted to perform continuous injection well drilling. The high-pressure fixed control device comprises a fixed control tank communicating with a pipeline, and a slurry liquid inlet, a compressed air inlet, a suck-back type sand draining pipe, a slurry solid discharging opening, a slurry buffering plate, a slurry baffle, a slurry deposition ramp, a gas vent nozzle and a slurry outlet are formed in a fixed control tank body. By using the high-pressure fixed control device, formation pressure is balanced without using or less using a slurry density method, and the problems of spraying, leakage, small circulation and the like between a series of underground stratums are solved. The sleeve-type drilling rod is used and according to a mode of sleeve well drilling, and drilling at a time is carried out to complete well cementation drilling. Continuous injectionwell drilling is realized, drilling operation can be carried out while an oil field water injection well is not closed and stopped, and the capacity and economic benefit of an old oil field are improved.

Description

technical field [0001] The invention relates to an oilfield drilling method, in particular to a non-stop drilling method for oilfield drilling. Background technique [0002] The current oilfield drilling techniques include: 1) For conventional drilling next to the water injection well, the water injection should be stopped half a month in advance. The drilling cycle takes half a month. After drilling, at least half a month of water injection recovery period is required. Therefore, the impact of conventional drilling on the normal production of the block is more than 40 days, which means that the annual production capacity will be reduced by about one tenth. If conventional renewal is adopted in the casing damage area, injection wells within 450m will be shut down for about 35 days, and 21 injection wells and about 25 water drive wells within 450m of the 125m-type II oil layer well pattern will affect development. Especially large, the impact on production capacity and econo...

AI Technical Summary

Problems solved by technology

2) Conventional snubbing drilling, that is, conventional underbalanced drilling, the purpose is to protect the oil and gas layers, and only a low snubbing pressure is required. Therefore, the surface snubbing mud treatment is simply a simple cyclone sand removal and solid control. The high content makes the working pressure of the choke manifold at the back lower to be safe (high pressure will puncture the choke valve), and the long-term pressure operation on the ground is only 2MPa, which cannot meet the 7MPa annular pressure requirement required by non-stop injection drilling

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