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Mud Cake Less Hollow Drilling Tool for Zero Fluid Loss Drilling

IP.com Disclosure Number: IPCOM000241115D
Publication Date: 2015-Mar-27
Document File: 4 page(s) / 437K

Publishing Venue

The IP.com Prior Art Database

Abstract

A new innovative drilling tool that consists of a hollow bit is introduced in this publication. One distinctive feature of this invention is that the flow direction of drilling fluid is proposed to be completely altered. The drilling fluid will return back to the surface from inside the hollow bit, ensuring zero fluid loss and minimum mud cake formation. This technique will also ensure proper well cleanup and comparatively faster drilling. A blade is installed inside the tool to crush the rock/ debris into smaller pieces. A rotating disc is also installed on the outer radius of the tool to scratch away any mud cake present and polish the surface of the formation.

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Mud Cake Less Hollow Drilling Tool for Zero Fluid Loss Drilling

Abstract:

A new innovative drilling tool that consists of a hollow bit is introduced in this publication. One distinctive feature of this invention is that the flow direction of drilling fluid is proposed to be completely altered. The drilling fluid will return back to the surface from inside the hollow bit, ensuring zero fluid loss and minimum mud cake formation. This technique will also ensure proper well cleanup and comparatively faster drilling. A blade is installed inside the tool to crush the rock/ debris into smaller pieces. A rotating disc is also installed on the outer radius of the tool to scratch away any mud cake present and polish the surface of the formation.

Description:

Drilling petroleum well is a complex process that requires large, heavy duty equipment. A conventional drilling rig first consists of a structure that can support a weight of several hundred tons. A million-pound" rig is routinely supposed to support 10,000 ft and, in some cases, as much as 30,000 ft of drill pipe and additional equipment. A drill bit is attached to the bottom of the drillpipe by one or more drill collars. The entire assembly ends at the floor of a drilling rig and is connected to a rotary table. This table, along with a special joint called the kelly, provides rotational motion to the drilling assembly.

A critical component of drilling is the drilling fluid, which is also widely referred to in the industry as drilling mud. One of the main roles of drilling fluid is to lift the drilling-rock cuttings to the surface and to lubricate the bit in its grinding, rotary action against the rock.

The drilling fluid also has other important functions. The weight of the drilling fluid (the fluid density) and the resulting hydrostatic pressure at the drilling point are supposed to impart a positive pressure into the formation. Otherwise, formation fluids under pressure may cause a kick, which is an involuntary influx of fluids into the well. Under extreme circumstances, a kick may cause a catastrophic blowout.

The residue deposited on a permeable medium when a drilling fluid is forced against the medium, under pressure, is the filter cake. Filtrate is the liquid that passes through the medium, leaving the cake on the medium. Filter cake formed on permeable zones in the wellbore can cause stuck pipe and other drilling problems. Reduced oil and gas production can result from formation damage when a poor filter cake allows deep filtrate invasion. A certain degree of cake buildup is desirable to isolate formations from drilling fluids.

A Drill bit, is a tool attached to the end of the drill string that breaks apart, cuts or crushes the rock formations when dril...