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Ultra High Viscosity Pill and Methods for Use with An Oil-Based Drilling System

a technology of ultra-high viscosity and oil drilling system, which is applied in the direction of earth drilling and mining, chemistry apparatus and processes, and well accessories. it can solve the problems of mud loss into the well, unstable well bore, and collapse of the drill pipe, etc., and achieve ultra-high viscosity and ultra-high viscosity

Inactive Publication Date: 2011-01-13
TEXAS UNITED CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As illustrated in numerous studies, problems in deep wells can be caused by well bore pressure deviating outside the pressure gradient window during drilling operations, resulting in non-productive time.
For example, at shallow depths, if the well bore pressure deviates below the pore pressure gradient, water or gas can flow into the well bore, and a kick can occur, or in some instances the well bore may become unstable and collapse on the drill pipe.
A major problem when pressure exceeds the fracture pressure-gradient is lost circulation, with a loss of mud into the formation with subsequent reservoir damage.
These pressure deviation issues account for numerous drilling problems, which in turn have a significant impact on drilling costs and well performance.

Method used

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  • Ultra High Viscosity Pill and Methods for Use with An Oil-Based Drilling System

Examples

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example 1

Preparation of Ultra-High Viscosity Fluid Pressure Transmission Pills (FPTP)

[0047]An organophilic clay (CLAYTONE® IMG 400, available from Southern Clay Products, Inc., Gonzalez, Tex.) was added to 0.675 bbl of a low aromatic mineral oil (PUREDRILL® HT-30, available from Petro-Canada, Calgary, Canada) and allowed to disperse equally before adding 0.18 gal / bbl of propylene carbonate (JEFFSOL®, available from Huntsman Petrochemical Corp., Houston, Tex.). The ingredients were then mixed for 10 minutes at 5000 rpm with an impeller-style mixer forming a ‘clay gel’. To this clay gel composition was added 0.144 gal / bbl of an emulsifier / wetting agent (STAB 2-CA, available from Quim Export, Inc., Houston, Tex.) and the solution was mixed for 5 minutes at 3000 rpm. Additionally, 4.32 gal / bbl of an oil-soluble copolymer slurry containing 17.5 lb / bbl of styrene-butadiene rubber (SBR 8113 Crumb, available from ISP Elastomers, Port Neches, Tex.), solubilized in 39.9 gal / bbl of low aromatic mineral...

example 2

Preparation of Fluid Pressure Transmission Pills (FPTP) with Varied Amounts of Thixotropic Viscosifier

[0050]Two FPTP having reduced organophilic clay concentrations, were prepared in order to demonstrate how lesser viscosity pills fail to create the barrier required to retain heavier fluids. An amount of organophilic clay (CLAYTONE® IMG 400 available from Southern Clay Products, Inc., Gonzales, Tex.), ranging from about 6 lb / bbl to 8 lb / bbl was added to 0.772 bbl of a low aromatic mineral oil (PUREDRILL® HT-30, available from Petro-Canada, Calgary, Canada) and allowed to disperse equally before adding 0.12 gal / bbl of propylene carbonate (JEFFSOL®, available from Huntsman Petrochemical Corp., Houston, Tex.). The ingredients were then mixed for 15 minutes at 4600 RPM with an impeller-style mixer, forming a ‘clay gel’. To this clay gel composition was added 0.30 gal / bbl of emulsifier / wetting agent (STAB 2-CA, available from Quim Export, Inc., Houston, Tex.), and the solution mixed for ...

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Abstract

A fluid pressure transmission pill (FPTP) having an ultra-high viscosity for use in association with hydrocarbon drilling and exploration operations, particularly, managed pressure drilling (MPD) operations, is described. The ultra-high viscosity pill is a weighted pill composition that includes a hydrocarbon fluid, a thixotropic viscosifying agent, one or more activators, an emulsifier / wetting agent, a fluid loss control additive, and a weighting material. In accordance with selected aspects of the described fluid pressure transmission pill, the ratio of the amount of the thixotropic viscosifying agent to the activator is a ratio of about 7:1, and the weighting material is a barium-containing solid-phase material. Also described are methods of use of such FPTP products in subterranean operations, such as well killing operations during managed pressure drilling.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority to U.S. Provisional Patent Application Ser. No. 61 / 224,136, filed Jul. 9, 2009, the contents of all of which are incorporated herein by reference in its entirety.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not applicable.REFERENCE TO APPENDIX[0003]Not applicable.BACKGROUND OF THE INVENTION[0004]1. Field of the Invention[0005]The inventions disclosed and taught herein relate generally to hydrocarbon drilling and exploration operations, and more specifically are related to fluid pressure transmission pills and their manufacture and use in support of drilling and exploration operations.[0006]2. Description of the Related Art[0007]Various types of well bore fluids are used in operations related to the development, completion, and production of natural hydrocarbon reservoirs. Typical operations include fracturing subterranean formations, modifying the permeability of subterranean...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K8/34
CPCC09K8/14C09K8/34C09K8/32C09K8/40E21B21/08
Inventor DOBSON, JR., JAMES W.TRESCO, KIM O.GEERDES, BENJAMIN K.
Owner TEXAS UNITED CHEM CORP
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