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Compositions and methods for improving the productivity of hydrocarbon producing wells using a non-ionic fluorinated polymeric surfactant

IP.com Disclosure Number: IPCOM000241900D
Publication Date: 2015-Jun-05

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The IP.com Prior Art Database

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Virginia Bergstrom: CONTACT

Abstract

Compositions described herein comprise nonionic fluorinated polymeric surfactants and solvent. Embodiments of the compositions are useful in the recovery of hydrocarbons from hydrocarbon-bearing clastic formations that contain brine and/or condensate. The solvent comprises at least one of a polyol or polyol ether, wherein the polyol and polyol ether have from 2 to 25 carbon atoms; and at least one alkylcarbonate such as a diethycarbonate, a dimethylcarbonate or a mixture thereof, wherein the solvent is capable of at least one of solubilizing or displacing brine or condensate in a hydrocarbon-bearing clastic formation.

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Compositions and methods for improving the productivity of hydrocarbon 

producing wells using a non‐ionic fluorinated polymeric surfactant

ABSTRACT

Compositions described herein comprise nonionic fluorinated polymeric surfactants and solvent.

Embodiments of the compositions are useful in the recovery of hydrocarbons from hydrocarbon-

bearing clastic formations that contain brine and/or condensate. The solvent comprises at least

one of a polyol or polyol ether, wherein the polyol and polyol ether have from 2 to 25 carbon

atoms; and at least one alkylcarbonate such as a diethycarbonate, a dimethylcarbonate or a

mixture thereof, wherein the solvent is capable of at least one of solubilizing or displacing brine

or condensate in a hydrocarbon-bearing clastic formation.

BACKGROUND

It is known in the subterranean well drilling art that in some wells (e.g., some oil and/or gas

wells) brine is present in hydrocarbon-bearing geological formations in the vicinity of the

wellbore (also known in the art as the "near wellbore region"). The brine may be naturally

occurring (e.g., connate water) and/or may be a result of operations conducted on the well.

In the case of some wells (e.g., some gas wells), liquid hydrocarbons (also known in the art as

"condensate") can form and accumulate in the near wellbore region. The presence of condensate

can cause a large decrease in both the gas and condensate relative permeabilities, and thus the

productivity of the well decreases.

In some cases the compositions described in this paper are usable for black oil and volatile oil

wells.

Methods for treating clastic formations bearing brine and at least one of black oil or volatile oil

using a composition containing a nonionic polymer and solvent are also described herein. The

solvent functions by at least one of solubilizing or displacing at least one of brine or oil in the

clastic formation.

Methods for treating a formation having at least one fracture using a composition containing a

nonionic polymer and solvent are also described.

Methods for making a composition for treating a clastic formation bearing brine and at least one

of black oil or volatile oil are also described.

 


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The presence of brine and/or gas condensate in a near wellbore region of a hydrocarbon-bearing

geological formation can inhibit or stop production of hydrocarbons from the well, and hence is

undesirable. Various approaches have been tried for increasing the hydrocarbon production of

such wells. One approach, for example, involves a fracturing and propping operation (e.g., prior

to, or simultaneously with, a gravel packing operation) to increase the permeability of the

hydrocarbon-bearing geological formation adjacent to the wellbore. Chemical treatments (e.g.,

injection of methanol) have also been used to improve productivity of such oil and/or gas wells.

The latter treatments are typically injected into the near wellbore region of a hydrocarbon-

b...