Sequenced polymers for monitoring the filtrate and the rheology
AssigneeRhodia Operations
InventorsArnaud Cadix, David James Wilson
Life of this patent
Estimating the term…
Abstract
The present invention relates to the use of a sequenced polymer as an agent for monitoring the filtrate and the rheology of a fluid injected under pressure into an oil rock, wherein the fluid comprises solid particles and/or is brought into contact with solid particles within the oil rock after being injected, the polymer comprising: a first block which is adsorbed onto at least some of the particles; and a second block having a composition other than that of the first block and a mean molecular weight of more than 10,000 g/mol, for example more than 100,000 g/mol, and which is soluble in the fluid.
Claims16
A process comprising injecting a fluid (F) under pressure into a subterranean formation,
- wherein said fluid (F) comprises solid particles (p) and/or is brought into contact with solid particles (p) within the subterranean formation subsequent to its injection,
- and a fluid loss control and rheology agent, wherein the fluid loss control and rheology agent is a block polymer (P) comprising:
- a first block (A) comprising of (meth)acrylate monomer units carrying a COOH or COO— group or esters thereof, which is adsorbed on at least a portion of the particles (p);
- and
- a second block (B) with a composition distinct from that of said first block (A), with a weight-average molecular weight of greater than 10 000 g/mol and up to 1 000 000 g/mol, and which is soluble in the fluid (F);
- and
- wherein the block polymer (P) has a molecular weight-average weight of greater than 500,000 g/mol and less than 2,500,000 g/mol.
Dependencies are inferred from the claim text.