Environment-friendly crosslinking and gelling retarding profile control agent and preparation method thereof

A technology of cross-linked gel and profile control agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve the problems affecting the injection performance of gel profile control agent and the performance of deep water control and displacement, and the gelation time of gel Short and other problems, to achieve the effect of large dose injection, expansion of injection water sweep volume, good temperature and salt resistance

Inactive Publication Date: 2013-03-13
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, one disadvantage of using Al(III) crosslinking system to prepare gel profile control agent is that the gelling time of the gel is too short. After adding Al(III) crosslinking system to the polymer solution, it will form gel quickly, which seriously affects the Injection Performance of Gel Profile Control Agent and Performance of Deep Control and Displacement

Method used

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  • Environment-friendly crosslinking and gelling retarding profile control agent and preparation method thereof
  • Environment-friendly crosslinking and gelling retarding profile control agent and preparation method thereof
  • Environment-friendly crosslinking and gelling retarding profile control agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the microstructure of environment-friendly delayed crosslinking gel profile control agent under scanning electron microscope

[0027] Use prepared water (see Table 1 for the ion content of the prepared water) to prepare 0.5% hydrophobic association polymer mother liquor, stir and dissolve fully and let it stand for 24 hours; use distilled water to prepare 1.0% aluminum citrate, 1.0% sodium sulfite and 1.0% sodium malate respectively solution; add 0.5% hydrophobic association polymer mother liquor 60ml, 1.0% aluminum citrate 1.5ml, 1.0% sodium sulfite 2.0ml, 1.0% sodium malate 1.6ml and 34.9ml prepared water into a 200ml jar, The bottle was placed on a magnetic stirrer and stirred for 30 minutes to prepare an environmentally friendly delayed crosslinking gel profile control agent; then the jar was placed in a thermostat set at 65°C to form a gel; The microstructure of the glue profile control agent, the experimental results are as follows figure 1 It is sh...

Embodiment 2

[0030] Embodiment 2: The impact of retarder dosage on the gelation time of environmental protection delayed cross-linked gel profile control agent

[0031] According to the method of preparing the environment-friendly delayed cross-linking gel profile control agent in Example 1, the added amount of the hydrophobic association polymer (0.3%), the cross-linking agent aluminum citrate (0.015%), and the antioxidant sodium sulfite (0.020%) were fixed , change the dosage of retarder sodium malate (0.006%, 0.008%, 0.010%, 0.012%, 0.014%, 0.016%, 0.018%, 0.020%), and prepare different dosage of retarder sodium malate Environmentally friendly delayed cross-linking gel profile control agent. Put the wide-mouth bottle containing the environmentally friendly delayed cross-linking gel profile control agent in an incubator set at 65°C to form a gel, and regularly use a Brookfield DV-III rotational viscometer (temperature 65°C, shear rate 7.34s -1 ) Determination of the gelation time of the...

Embodiment 3

[0032] Embodiment 3: the temperature resistance of environmental protection delay cross-linked gel profile control agent

[0033] According to the method for preparing the environmental protection delayed cross-linking gel profile control agent in Example 1, the preparation of the environmental protection delayed cross-linked gel profile control agent is packed into 8 jars respectively; In constant temperature boxes at different temperatures (45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C and 80°C), the Brookfield DV-III rotational viscometer (temperature at 65°C, shear rate 7.34s -1 ) to determine the gelling strength of the environmentally friendly delayed cross-linking gel profile control agent. Experimental results such as image 3 As shown, as the temperature rises, the gel strength of the environmentally friendly delayed cross-linking gel profile control agent weakens, but at 80°C, the gel strength is still 25600mPa.s, indicating that the profile control agent has better res...

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Abstract

The invention discloses an environment-friendly crosslinking and gelling retarding profile control agent and a preparation method thereof and belongs to the field of enhanced oil recovery technologies for oilfields. The profile control agent comprises a primary agent, i.e. hydrophobic association, a crosslinking agent, i.e. aluminum citrate, an antioxidant, i.e. sodium sulfite, and a retarding agent, i.e. sodium malate, and contains all the ingredients in percentage by weight: 0.1-0.4% of hydrophobic association, 0.01-0.02% of aluminum citrate, 0.015-0.025% of sodium sulfite, 0.005-0.020% of sodium malate and the balance of water. The profile control agent disclosed by the invention has the characteristics that the profile control agent is environment-friendly and is free of damage/injury to environments/human bodies; the crosslinking is retarded, and the gelling time is prolonged, thereby being beneficial to high-dose injection and deep profile control; the plugging rate is high; and the profile control agent has certain temperature-resistant and salt-tolerant performance and scouring resistance. The profile control agent can be used for adjusting a water absorption profile of a water-flood well and improving the water-flood development effect of oilfields.

Description

technical field [0001] The invention relates to the technical field of oil field enhanced oil recovery, in particular to an environment-friendly delayed cross-linking gel profile control agent and a preparation method thereof. Background technique [0002] Most oilfields in my country adopt the water injection development method to supplement the underground deficit caused by the extraction of crude oil, and at the same time maintain or increase the pressure of the oil layer to achieve stable and high production of crude oil. In the process of water flooding development, the heterogeneity of the reservoir will lead to the single-layer burst or planar tongue of the injected water; the large pores formed by long-term scour will lead to the channeling of the injected water along the large pores, and the low-permeability layer will not absorb water or absorb water. Into the water, greatly reducing the effect of water injection development in oilfields. [0003] In order to impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C09K8/58
Inventor 赖南君陈科叶仲斌李翠霞覃孝平王星媛杨亚宇彭琴
Owner SOUTHWEST PETROLEUM UNIV
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