PS [PAM-Ca-LS (polyacrylamide-calcium lignin sulfonate)] lignin gel type profile control agent and method for preparing same

A gel type, profile control agent technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of short profile control validity period, low plugging efficiency, high initial viscosity, and the gel time can be adjusted. , The effect of high blocking efficiency and low product cost

Inactive Publication Date: 2017-06-09
大庆市杰森钻采助剂厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at overcoming the problems of high initial viscosity, short effective period of profile control, low plugging efficiency and poor profile control effect of existing profile control agents existing in the background technology, and provides a PS lignin gel type profile control agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] First add 471.0g water to the container, then add 10g gelling agent calcium lignosulfonate, 2.0g colloidal stabilizer thiourea, 2.5g reducing agent anhydrous sodium sulfite, 2.0g chelating agent tetrasodium edetate, After circulating and stirring for half an hour at normal temperature and pressure, slowly sprinkle 4.0g of high molecular polymer polyacrylamide, circulate and stir for 2 hours, and let it stand for 8 hours to become lignin gel type profile control agent A; at the same time, 4.0g Dissolve the cross-linking agent Sodium Red Alum completely in another container with 4.0g of water to form the lignin gel type profile control agent B; add 0.5g retarder sodium citrate to Agent A before injecting, and then add Agent B to it , stir to get 500g product. The apparent viscosity of the base fluid was tested with a rotational viscometer to be 150.0 mPa·s. Then the product was put into an oven at 50°C for reaction, and the gelation time was tested for 5 hours; the gelat...

Embodiment 2

[0014] First add 452.5g water in the container, then add 20g gelling agent calcium lignosulfonate, 2.5g colloidal stabilizer thiourea, 2.5g reducing agent anhydrous sodium sulfite, 2.0g chelating agent tetrasodium edetate, After circulating and stirring at normal temperature and pressure for half an hour, slowly sprinkle 6.0g of high molecular polymer polyacrylamide, circulate and stir for 2 hours, and let it stand for 8 hours to become lignin gel type profile control agent A; at the same time, 6.0g Dissolve the cross-linking agent sodium red alum completely in another container with 6.0g of water, and it is the lignin gel type profile control agent B agent; add 2.5g retarder sodium citrate to agent A before injection, and then add agent B to it , stir to get 500g product. The apparent viscosity of the base fluid was measured with a rotational viscometer to be 230.0 mPa·s. Then put the product into an oven at 50°C for reaction, and test the gelation time for 24 hours. The ge...

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Abstract

The invention relates to a PS [PAM-Ca-LS (polyacrylamide-calcium lignin sulfonate)] lignin gel type profile control agent. By the aid of the PS lignin gel type profile control agent, the problem of poor profile control effects due to high initial viscosity, short profile control valid periods and low plugging efficiency of existing profile control agents mainly can be solved. The PS lignin gel type profile control agent is characterized by comprising, by weight, 0.5-1.5% of macromolecular polymers, 1-10% of gel, 0.2-2.0% of colloid stabilizers, 0.2-2.0% of reducing agents, 0.2-0.6% of chelating agents, 0-1.0% of retarders, 0.5-1.5% of cross-linking agents and the balance water. A method for preparing the PS lignin gel type profile control agent includes adding the corresponding water into a container, then sequentially adding the gel, the colloid stabilizers, the reducing agents and the chelating agents into the container, circularly stirring the corresponding water, the gel, the colloid stabilizers, the reducing agents and the chelating agents at the normal temperature under the normal pressure for half an hour to obtain first mixtures, then spreading the macromolecular polymers into the first mixtures, stirring the macromolecular polymers and the first mixtures for 2 hours to obtain second mixtures and allowing the second mixtures to stand still for 8 hours to obtain agents A; completely dissolving the cross-linking agents and the corresponding water according to a proportion of 1:1 to obtain agents B; adding the retarders into the agents A before the agents B are injected, adding the agents B into the agents A and uniformly stirring the agents A, the retarders and the agents B to obtain the PS lignin gel type profile control agent. The PS lignin gel type profile control agent and the method have the advantages of long profile control valid period, high plugging efficiency and good profile control effect.

Description

technical field [0001] The invention relates to a treatment agent in the field of oil recovery technology, in particular to a PS lignin gel type profile control agent and a preparation method thereof. Background technique [0002] At present, most oilfields are developed by water flooding, and the heterogeneity of the oil layer will be aggravated over time due to the scour of injected water. The heterogeneity of the oil layer makes the injected water often absorbed by the high-permeability layer. In order to play the role of the medium and low-permeability layer and increase the involvement coefficient of the injected water, it is necessary to adjust the water absorption profile of the water-injected oil layer, that is, to adjust the profile. The dissection agent blocks the high permeability layer and reduces the water absorption capacity of the high permeability layer, so that the water can be injected into the section in a balanced manner. Due to the high initial viscosit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C08L97/00C08L33/26C08J3/24
CPCC09K8/512C08J3/246C08J2397/00C08J2433/26C08L97/005C08L33/26
Inventor 周东材王映丽
Owner 大庆市杰森钻采助剂厂
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