Fine pressure control well cementing operation method

Abstract

The invention discloses a fine pressure control well cementing operation method. The method comprises the following steps of preparing a wellhead sealing device matched with the outer diameter of a tubular column which is put down; conducting optimizing design on fine pressure control well cementing construction parameters through conventional well cementing software; according to fine pressure control well cementing design, putting a well cementing pipe string with pressure to a designed well depth, starting a pump for circular exhaust, and adjusting the density of drilling fluid of a well shaft to a designed value; after the density of the drilling fluid of the well shaft is stable, shutting down the pump, supplying pressure at a wellhead through fine pressure control ground equipment toguarantee the stability of the pressure under the well, and connecting well cementing construction equipment; pumping pre-pad fluid, cement paste, post-pad fluid and drilling fluid according to the fine pressure control well cementing construction design, after the liquid is pumped, the fine pressure control ground equipment gets involved, the under-well pressure reduction value caused by pump stopping is compensated for, and the stability of the pressure under the well is guaranteed; pressure continues to be supplied to the wellhead until cement is set, and then the pressure is relieved. Bymeans of the method, the complicated problem that spraying missing is caused by pressure fluctuation under the well in the construction process of the strata can be effectively solved, and the well cementing quality of the deep well is greatly improved.

Description

technical field [0001] The invention relates to the field of well cementing operations of sulfur-containing oil and gas wells, in particular to a method for cementing operations of narrow safe and airtight windows in sulfur-containing formations. Background technique [0002] As exploration and development gradually move towards deep and complex formations, drilling operations are faced with more complex leaks and blowouts. Precision managed pressure drilling has become an important tool to solve the problems of leaks and blowouts. played an important role. However, in the process of well cementing, there are also complicated situations of blowout leakage. Due to the sensitivity of formation pressure, in order to ensure the safety of well control, when the formation is stabilized by conventional methods, it is easy to cause circulation time during the process of well killing, casing running and pumping cement slurry. Severe leakage or even the return of the wellhead makes i...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the defects and deficiencies of the above-mentioned prior art, and to provide a precise pressure-controlled cementing operation method, which can effective

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