Downhole control pressure casing drilling method containing formation injection pressure

Abstract

The invention relates to a control pressure casing drilling method for underground containing formation injection pressure. The problems that the yield and the three-production development effect are affected during drilling, closing and updating of an existing three-production casing damage well, and drilling safety is affected when drilling and closing are not conducted are mainly solved. The method is characterized by comprising the steps of drilling a well, cementing the well, installing pressure control drilling equipment and testing pressure; secondly, drilling a well in a non-oil-layer section, testing a hydraulic pressurizing anti-deviation tool, and recording the pressure of a vertical pipe and the pump displacement in the process; drilling in a second-opening casing drilling section, and performing second-opening well cementation; and logging. By the adoption of the drilling method for the control pressure casing pipe containing the formation injection pressure underground, a renewal well can be drilled under the condition that the well is not stopped, the injection-production relation of a casing damage well group can be completed in time, injection of a drilling area is not affected, and the normal block development effect is guaranteed.

Description

technical field [0001] The invention relates to the field of oil fields, in particular to a pressure-controlled casing drilling method for downhole containing formation injection pressure. Background technique [0002] After years of oilfield development, the number of wells with casing damage problems in the third production block is increasing. According to the production capacity construction needs of the third mining block, more and more wells need to be drilled and updated. However, conventional drilling of newer wells has the following problems: [0003] (1) Drilling passes have a great impact on production: due to the scattered distribution of update wells, pressure reduction is required during conventional drilling (the so-called "drilling pass"). On average, there are 40 water (inlet) wells in the scope, and the impact time is about 35 days. Conventional drilling of one renewal well affects the oil volume and causes large pressure changes in the local well area, w...

AI Technical Summary

Problems solved by technology

[0003] (1) Drilling and shutting down has a great impact on production: due to the scattered distribution of renewal wells, pressure reduction (so-called "drilling and shutting") is required during conventional drilling. 40 water (inflow) wells are concerned in the scope on average, and the impact time is about 35 days. Conventional drilling of a renewal well affects a large amount of oil, and causes a large change in pressure in the local well area, which is not conducive to casing protection

[0004] (2) Drilling and shutting down of renewal wells affects the development effect of tertiary oil recovery: According to the requirements of the oil displacement plan, in order to ensure the development effect of the tertiary recovery and injection accumulation block, continuous injection is required during the injection cycle, which makes the casing damaged wells in the tertiary oil recovery block It cannot be updated in time, and the local well pattern is not perfect for injection and production; if the renewal well is a tertiary production well pattern, and it is updated after waiting for a cycle, the reserves in the renewal well area have not been effectively produced during the tertiary oil recovery process, and it is impossible to carry out another three production wells. Oil recovery; if drilling and shutting down is used to reduce pressure, the slug in the accumulation area will be loosened, which will affect the development effect and benefits of the tertiary production

[0005] (3) Non-drilling and shutting down will have a great impact on drilling safety and cementing quality under conventional drilling conditions: it may be difficult to determine the local ultra-high pressure of formation static pressure, and there may be superimposed risks such as shallow gas in some blocks

[0006] At present, in view of the above-mentioned geological conditions, in order to ensure drilling safety and cementing quality, conventional drilling of renewal wells is completed under the condition of drilling shut-down wells, and it is difficult to drill renewal wells without drilling shut-down wells