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Modifying and flooding agent for reutilization of residual polymers in formation and application thereof

A technology of polymer and flood control agent, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as adverse effects of stable production in oil fields, large space occupation, long swelling stage, etc., and reduce the concentration of produced polymers. , the effect of enhancing crude oil recovery and improving development effect

Active Publication Date: 2014-06-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, flocculation technology is the most widely used in the reuse technology of formation residual polymer. The preferred flocculant is stabilized sodium soil YG340-1, which is mainly composed of inorganic bentonite and stabilizer, and has the advantages of excellent performance and low price. However, Injecting stabilized sodium soil YG340-1 after polymer flooding may have the risk of plugging non-target oil layers. According to the specific reservoir conditions of offshore oilfields, subsequent plugging removal measures and plugging removal effects of offshore oilfields will also have a negative impact on the stable production of oilfields
In addition, the main form of polymer used in polymer flooding operations in onshore oilfields is dry powder, which has a long swelling stage and slow dissolution rate. It requires large-scale dissolution and aging equipment, which takes up a lot of space, and its use in offshore oilfields is limited.

Method used

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  • Modifying and flooding agent for reutilization of residual polymers in formation and application thereof
  • Modifying and flooding agent for reutilization of residual polymers in formation and application thereof
  • Modifying and flooding agent for reutilization of residual polymers in formation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Composition of Formation Residual Polymer Reuse Regulator and Displacement Agent

[0040] Formation residual polymer reuse control and flooding agent, based on 100% of the total control and flooding agent, is composed of 0.8% to 2.0% of water medium-dispersed polyacrylamide and the rest of formation water;

[0041] The water-medium-dispersed polyacrylamide is selected from water-in-water cationic emulsion WF40 (Beijing Demei Hi-Tech Co., Ltd.), with a solid content of 46.3% to 48.2%, an effective content of 18% to 20%, and a relative molecular mass of 750×10 4 ~800×10 4 , cationic degree is 38-41.

[0042] The formation water contains Na + , Ca 2+ , Mg 2+ , SO 4 2– 、HCO 3 – and Cl – of deionized water, where the Na + The concentration is 950.89mg·L -1 , Ca 2+ +Mg 2+ The concentration is 30.61mg·L -1 , CO 3 2- The concentration is 107.14mg·L -1 , SO 4 2– The concentration is 43.62mg·L -1 , HCO 3 – The concentration is 924.45mg·L -1 , Cl...

Embodiment 2

[0044] Embodiment 2, the solubility property of water-in-water cationic emulsion WF40

[0045] Weigh 1.5 g of the water-in-water cationic emulsion WF40 described in Example 1 and add it to 98.5 g of the formation injection water described in Example 1 to prepare a reuse control and flooding agent solution with a mass concentration of 1.5%. Stir at a constant speed of 400r / min, sample every 2min, at 20°C and 7.34s -1 Under certain conditions, use a Brookfield DV-III viscometer to measure the viscosity of the reusing agent solution at different times. At a certain moment, the change between the viscosity values ​​of two adjacent measurements is not more than 5%, and this moment is the shear value. Dissolving time at shear rate. The viscosity of the solution depends on the stirring time figure 1 shown.

[0046] The experimental results show that the water-in-water cationic emulsion has better solubility properties, and the dissolution time at 20°C is 6-10 minutes. This is bec...

Embodiment 3

[0047] Example 3. Relation of Viscosity and Concentration of Regulating and Displacing Agents Reused by Formation Residual Polymers

[0048] Weigh 3.0g of the water-in-water cationic emulsion WF40 described in Example 1 and add it to the formation injection water described in 97.0g of Example 1, stir and dissolve for 10min under the condition of 400r / min, and prepare a mass concentration of 3%. Reuse the mother solution of the flood control agent, and then dilute it into the target solution with a mass concentration of 0.5%, 1.0%, 1.5%, 2.0%, and 2.5%. At 20°C and 7.34s - Under 1 condition, measure the viscosity value of solution with Brookfield viscometer, the results are shown in figure 2 . Depend on figure 2 It can be seen that the viscosity of the reutilization control agent for formation residual polymer increases exponentially with the increase of concentration. When the mass concentration is 1.5%, the viscosity is 22.4mPa·s, which shows that it has good injectabilit...

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Abstract

The invention relates to a modifying and flooding agent for reutilization of residual polymers in a formation and an application thereof. The modifying and flooding agent for the reutilization of the residual polymers in the formation consists of 0.8-2.0% of aqueous medium dispersing type polyacrylamide and formation water. The modifying and flooding agent, provided by the invention, has the advantages of simplicity in system constitution, environment friendliness, short dissolving time, simple construction process, few utilized devices and suitability in field use of offshore polymer flooding. According to the modifying and flooding agent for the reutilization of the residual polymers in the formation, a flocculation system can be formed in the polymer flooding process and the subsequent water driving process by utilizing the residual polymers in the formation so as to effectively block a high-permeability channel, so that the modifying and flooding agent has capacities for delaying the penetration of polymer solution in the formation and improving a conformance factor, and the recovery efficiency of crude oil is improved, and the concentrations of the produced polymers are lowered.

Description

technical field [0001] The invention relates to a control and flooding agent for reuse of formation residual polymer and its application, belonging to the technical field of oil and gas field development engineering. Background technique [0002] The development of offshore oilfields is limited by the life of the platform. After more than ten years of research on polymer flooding laboratory experiments and development of field tests, polymer flooding has been successfully used in offshore heavy oil reservoirs, and high-efficiency production has been obtained. and economic benefits. However, due to the harsh formation conditions of offshore heavy oil reservoirs, with the development of polymer flooding in oilfields, the reservoir permeability gradient is getting bigger and bigger, channeling is serious, and more and more effective polymer flooding wells are producing The problem that the polymer concentration is too high and the water cut rises rapidly has greatly reduced th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588
Inventor 戴彩丽杨帅由庆姜维东张健赵明伟赵光
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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