Managed pressure drilling pulling method

Abstract

The invention relates to the technical field of managed pressure drilling pulling, in particular to a managed pressure drilling pulling method. The managed pressure drilling pulling method is carriedout according to the following steps that first, before managed pressure drilling pulling, according to the actual formation pressure and the under-pressure pulling height, the heavy slurry density isdesigned through the formula that the heavy slurry density=(the formation pressure-the light slurry density*the under-pressure pulling height*the gravity coefficient)/[(the well depth-the under-pressure pulling height)*the gravity coefficient]. Through the managed pressure drilling pulling method, the situation that when drilling liquid in a drilling tool flows to a drilling floor, the drilling floor is wet and slippery can be effectively avoided, in this way, the operation risk of drilling floor workers can be reduced, meanwhile, waste of the drilling liquid is also avoided, and the cost issaved; and pulling is conducted through the managed pressure drilling pulling method, if taking a well with the well depth being 3000 m as an example, the pulling time only needs 10-12 h, compared with an existing managed pressure drilling technology, the pulling time is shortened by 3-6 h, and thus the managed pressure drilling pulling time efficiency can be effectively improved through the managed pressure drilling pulling method.

Description

technical field [0001] The invention relates to the technical field of pressure-managed drilling and tripping, and relates to a method for managing pressure drilling and tripping. Background technique [0002] The control technology and working principle of the MPD system: 1. The drilling fluid density lower than the conventional method is used in the design for near-balanced drilling; 2. The bottom hole pressure is equal to the hydrostatic column pressure plus the annular pressure loss and the wellhead back pressure during circulation. , when performing managed pressure drilling with constant bottomhole pressure, it is necessary to maintain a constant annular pressure profile throughout the operation. Through the measured bottom hole pressure data, the hydraulic model software automatically calculates and comprehensively analyzes, and timely adjusts the control parameters of MPD (control fluid density, fluid rheological properties, annular liquid level, wellbore geometry, s...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a managed pressure drilling tripping method, which overcomes the deficiencies of the prior art and can effectively solve the negative pressure difference caused by the annular liquid column pressure being greater than the internal pressure of the drilling tool when the commonly used MPD technology is tripping out. As a result, the drilling fluid in the drilling tool cannot flow into the wellbore through the water hole of the drilling tool. When the drilling tool is unloaded, the drilling tool is easy to flow to the drill floor, causing the drill floor to be wet and slippery, increasing the operating risk of the drilling floor personnel, and reducing the drilling time. At the same time, the problem of drilling fluid loss