Placement process for oil field chemicals
First Claim
Patent Images
1. The process for the continuous release of an oil field chemical within a subterranean hydrocarbon bearing formation or wellbore penetrating such formation comprising:
- (a) placing said oil field chemical in a solid polymeric matrix comprising the condensation product of hydroxyacetic acid monomer or hydroxyacetic acid co-condensed with up to 15 percent by weight of other hydroxy-, carboxylic acid-, or hydroxycarbonyl acid-containing moieties, said condensation product having a number average molecular weight of from about 200 to about 4000;
(b) dispersing particles of such solid polymeric matrix containing such chemical in a wellbore fluid which is a non-solvent for such polymeric particles and contained chemical; and
(c) introducing said wellbore fluid containing said particles into a wellbore or subterranean formation through a wellbore;
then(d) allowing water and temperature to degrade said particulate condensation products to form water soluble and oil soluble components; and
thereby(e) continuously releasing said chemical from said degraded particulate condensation products.
2 Assignments
0 Petitions
Accused Products
Abstract
Oil field chemicals are incorporated in polymeric particles of the condensation product of hydroxyacetic acid or the co-condensation product of hydroxyacetic acid and other compounds containing hydroxy-, carboxylic acid-, or hydroxycarboxylic acid moieties. The particles are introduced into an oil well bore and/or subterranean oil formation where the polymeric particles dissolve over a period of time and release the oil field chemicals.
362 Citations
7 Claims
-
1. The process for the continuous release of an oil field chemical within a subterranean hydrocarbon bearing formation or wellbore penetrating such formation comprising:
-
(a) placing said oil field chemical in a solid polymeric matrix comprising the condensation product of hydroxyacetic acid monomer or hydroxyacetic acid co-condensed with up to 15 percent by weight of other hydroxy-, carboxylic acid-, or hydroxycarbonyl acid-containing moieties, said condensation product having a number average molecular weight of from about 200 to about 4000; (b) dispersing particles of such solid polymeric matrix containing such chemical in a wellbore fluid which is a non-solvent for such polymeric particles and contained chemical; and (c) introducing said wellbore fluid containing said particles into a wellbore or subterranean formation through a wellbore;
then(d) allowing water and temperature to degrade said particulate condensation products to form water soluble and oil soluble components; and
thereby(e) continuously releasing said chemical from said degraded particulate condensation products. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification