Zirconium dispersed-particle gel combination flooding system and preparation method thereof

Patent metadata

Field	Value
Publication number	US-2016289540-A1
Application number	US-201415038359-A
Country	US
Kind code	A1
Filing date	Nov 21, 2014
Priority date	Nov 21, 2013
Publication date	Oct 6, 2016
Grant date	—

Abstract

The invention belongs to the field of oilfield chemistry and specifically relates to a zirconium dispersed-particle gel combination flooding system. The zirconium dispersed-particle gel combination flooding system comprises multi-scale zirconium dispersed-particle gel, polyether nonionic surfactant, and water as mixing liquid; the weight percentage of multi-scale zirconium dispersed-particle gel in the combination flooding system ranges from 0.16% to 0.24%; the weight percentage of polyether nonionic surfactant in the combination flooding system ranges from 0.1% to 0.4%; the rest is water, and the sum of the weight percentage of the each component is 100%. The multi-scale zirconium dispersed-particle gel and polyether nonionic surfactant of the present invention perform good synergistic effect, which reduces the oil/water interfacial tension to the order of magnitude of 10 −3 mN/m, significantly improves the displacing efficiency of the flooding agent, avoids the adverse effects caused by polymer viscosity loss in binary combination flooding or ternary combination flooding and the adverse effects caused by alkalis, as well as improves the flooding performance of the combination flooding system.

First claim

1 . A zirconium dispersed-particle gel combination flooding system, comprising: multi-scale zirconium dispersed-particle gel, polyether nonionic surfactant and clean water or treated oilfield recycled produced water; wherein,
the weight percentage of multi-scale zirconium dispersed-particle gel in the combination flooding system ranges from 0.16% to 0.24%; the weight percentage of polyether nonionic surfactant in the combination flooding system ranges from 0.1% to 0.4%; the rest is water, and the sum of the weight percentage of each component is 100%.

2 . The zirconium dispersed-particle gel combination flooding system according to claim 1 , wherein, the said multi-scale zirconium dispersed-particle gel is nano-scale, micron-scale or millimeter-scale water-soluble dispersed-particle gel prepared by mechanical shearing bulk zirconium gel, of which the particle diameter ranges from 92 nm to 5.5 mm; the multi-scale zirconium dispersed-particle gel of combination flooding system is one of nano-scale, micron-scale and millimeter-scale zirconium dispersed-particle gel.

3 . The zirconium dispersed-particle gel combination flooding system according to claim 1 , wherein the formula of polyether nonionic surfactant is as follows:

in the formula, R represents C 8 ˜C 13 alkyl; n represents the total number of ethoxy groups, n=2˜4; m represents the total number of propoxy groups, m=1, 2; wherein n and m are integers.

4 . The zirconium dispersed-particle gel combination flooding system according to claim 1 , wherein the said water as mixing liquid is clean water or treated oilfield recycled produced water.

5 . The preparation method of the zirconium dispersed-particle gel combination flooding system according to claim 1 , comprising the following steps:
adding one of nano-scale, micron-scale or millimeter-scale zirconium dispersed-particle gel to the water as mixing liquid under room temperature, stirring for five minutes until the zirconium dispersed-particle gel being uniformly dispersed; then adding the polyether nonionic surfactant, stirring for another five minutes until the polyether nonionic surfactant being dissolved thoroughly, so that the zirconium dispersed-particle gel combination flooding system is obtained; the weight percentage of the zirconium dispersed-particle gel in the zirconium dispersed-particle gel combination flooding system ranges from 0.16% to 0.24%, while weight percentage of surfactant ranges from 0.1% to 0.4%.

6 . A flooding method, in which the zirconium dispersed-particle gel combination flooding system according to claim 1 , comprising the following steps:
(1). injecting the prepositive pretreatment plug into stratum, the injection volume of which ranges from 0.1% to 1.0% of the formation porous volume; (2). injecting the main plug into stratum, the injection volume of which ranges from 30% to 50% of the formation porous volume; (3). injecting the postpositive protective plug into stratum, the injection volume of which ranges form 0.1% to 1.0% of the formation porous volume; (4). shutting in the well for five to ten days; (5). starting up the well to reproduct.

7 . The flooding method according to claim 6 , wherein, the said prepositive pretreatment plug is aqueous solution of the said polyether nonionic surfactant, the weight percentage of the polyether nonionic surfactant in the aqueous solution ranges from 0.1% to 0.4%.

8 . The flooding method according to claim 6 , wherein the said main plug is the said zirconium dispersed-particle gel combination flooding system.

9 . The flooding method according to claim 6 , wherein the said postpositive protective plug is aqueous solution of the nano-scale, micron-scale or millimeter-scale zirconium dispersed-particle gel, the weight percentage of zirconium dispersed-particle gel in the aqueous solution ranges from 0.16% to 0.24%.

10 . The flooding method mentioned according to claim 6 , wherein the formula of polyether nonionic surfactant is as follows:

in the formula, R represents C 8 ˜C 13 alkyl; n represents the total number of ethoxy groups, n=2˜4; m represents the total number of propoxy groups, m=1, 2; wherein n and m are integers;
the said water as mixing liquid is clean water or treated oilfield recycled produced water.

Assignees

• Univ China Petroleum

Inventors

• Dai Caili
• Zhao Guang
• You Qing
• Zhao Mingwei

Classifications

• C09K8/584 Primary

  characterised by the use of specific surfactants · CPC title

• C09K2208/10

  Nanoparticle-containing well treatment fluids · CPC title

• C09K8/032

  Inorganic additives · CPC title

• E21B43/20

  Displacing by water · CPC title