Shell Oil Comapny

Richard Pollard

John Michael Karanikas

Gary Lee Beer

Augustinus Wilhelmus Maria Roes

Robert Irving McNeil, Iii

Marian Marino

Robert Charles Ryan

Sunil Ashtekar

A chemical probe composition comprising a base fluid and a chemical probe, wherein the chemical probe is capable of reacting with hydrogen sulfide to form a fluorophore and associated methods and systems.

Methods of measuring hydrogen sulfide concentrations in reservoir fluids

Systems and methods used in treating a subsurface formation are described herein. Some embodiments also generally relate to barriers and/or methods to seal barriers. A method used to treat a subsurface formation may include heating a portion of a formation adjacent to a plurality of wellbores to raise a temperature of the formation adjacent to the wellbores above a mobilization temperature of bitumen and below a pyrolysis temperature of hydrocarbons in the formation; and allowing the bitumen to move outwards from the wellbores towards a portion of the formation comprising water cooler than the mobilization temperature of the bitumen so that the bitumen solidifies in the formation to form a barrier.

Forming bitumen barriers in subsurface hydrocarbon formations

Systems and methods for treating a subsurface formation are described herein. Some method include providing heat to a section of the formation from a plurality of heaters located in the formation, allowing the heat to transfer from the heaters to heat a portion of the section to a selected temperature to generate an in situ deasphalting fluid in the section, contacting at least a portion of the in situ deasphalting fluid with hydrocarbons in the section to remove at least some asphaltenes from the hydrocarbons in the section, and producing at least a portion of the deasphalted hydrocarbons from the formation. The in situ deasphalting fluid may include hydrocarbons having a boiling range distribution between 35&#xb0; C. and 260&#xb0; C. at 0.101 MPa. A majority of the hydrocarbons in the section may have a boiling point greater than 260&#xb0; C. at 0.101 MPa.

Methods for treating hydrocarbon formations

A method of recovering energy from a subsurface hydrocarbon containing formation includes introducing an oxidizing fluid in a wellbore positioned in at least a first portion of the formation. At least a portion of the first portion of the formation has been subjected to an in situ heat treatment process. The portion includes a treatment area having elevated levels of coke substantially adjacent the wellbore. The pressure in the wellbore is increased by introducing the oxidizing fluid under pressure such that the oxidizing fluid substantially permeates a majority of the treatment area and initiates a combustion process. Heat from the combustion process is allowed to transfer to fluids in the treatment area. Pressure decreases in the wellbore such that heated fluids from the portion of the formation are conveyed into the wellbore. The heated fluids are transferred to a heat exchanger configured to collect thermal energy.

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Pearland, TX, United States of America

Richard Pollard