Sodium Lignosulphonate used as oil displacement agent in oilfield
Sodium Lignonsulphonate:
The total recovery rate of conventional primary oil recovery (POR)
and secondary oil recovery (SOR) can only reach 20%~40%, and the
maximum is 50%. Almost half of the crude oil fails to be recovered.
Therefore, it is necessary to use tertiary oil recovery technology
to improve the oil recovery rate in the later stage of oil field
exploitation. Up to now, there are the following methods for
tertiary oil recovery: (1)thermal flooding, including steam
flooding and burning reservoir; (2) miscible flooding, including
COz miscible, hydrocarbon miscible and other inert gas miscible;
(3) Chemical flooding, including polymer flooding, surfactant
flooding, alkali flooding and concentrated sulfuric acid flooding;
Microbial oil recovery, including biopolymer, microbial
surface-active flooding.
Among them, surfactant flooding is a very effective method and one
of the most used chemical flooding methods at present. Surfactant
flooding can enhance oil recovery by reducing oil-water interfacial
tension and increasing capillary number.
In surfactant flooding, due to the adsorption of rock surface, a
large amount of surfactant is lost, thus increasing the cost.
Therefore, in order to reduce the loss of surfactant, the formation
is often pretreated with a sacrificial agent before surfactant
injection, or the sacrificial agent is injected into the formation
with the surfactant. Sacrifice agent can be adsorbed on the rock
surface or into the rock seam, so as to reduce the loss of
surfactants and polymers, sacrifice agent refers to their own loss
to reduce the loss of other chemical agents cheap chemical agent.
Lignosulfonates and their modified products are now considered to
have the greatest potential because they are by-products of the
paper industry and are widely available and inexpensive.
Lignosulfonate molecules contain highly ionized sulfonic acid
roots, with negative charge, it is easy to adsorption on the solid
surface, so that the solid surface with negative charge, with
lignosulfonate treated rock surface will be on the displacement
agent anionic surfactant and polymer inert, reduce the loss of
surfactants.
| NO | Index items | Standard value | Test Results |
| 1 | Appearance | Yellow Brown powder | Meets the requirement |
| 2 | PH Value(1% soluble) | 6-9 | 7 |
| 3 | Dry matter | 93%min | 93.50 |
| 3 | Moisture | 7.0%max | 6.5 |
| 4 | lignosulphonate | 60%min | 61.40 |
| 5 | Total reducing matter | 3.0% max | 2.5 |
| 6 | Inorganic salt (Na₂SO₄) | 2.0%max | 0.5 |
| 7 | Water insoluble matter | 2.0%max | 1.85 |
| 8 | Calcium Magnesium General quantity | 0.5%max | 0.25 |
| 9 | Viscosity(20% aqueous solution 18-20℃) | 7-10 | 8.7 |
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