Compound profile modifying/water plugging agent

A profile control water shutoff agent, compound technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of non-resistance to salt, pump blocking, inconvenient to carry, etc., to reduce the risk of construction and increase the economy benefit and improve the effect of profile control

Active Publication Date: 2014-07-09
BEIJING ENRUIDA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the plugging of the cross-linked polymer weak gel in the formation is dynamic, and the weak gel can migrate under certain conditions, so that it has dual functions of deep water control and flooding, which is the most widely used deep water flooding at home and abroad. However, there are many factors affecting its performance, it is highly targeted, and most of it is not resistant to salt, so it is generally not suitable for deep profile control operations in low-permeability formations with a salinity of 50,000mg / L or more and a temperature of 90°C or more
Pre-crosslinked granules are also called volume-expanded granules. This profile control technology is a new type of profile control technology developed in recent years. It has the characteristics of larger specific gravity than water and relatively large particles, which is easy to cause pump blockage, and is not easy to carry to deep low-porosity formations, thus affecting the effect of deep profile control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of composite profile control water shutoff agent: Add 7.5Kg polyacrylamide (molecular weight 15 million, hydrolysis degree 25%) into 5m 3 In water, stir evenly; then add 50Kg of pre-crosslinked granular polyacrylate-kaolin composite resin (solid content: 32%), 5Kg of crosslinking agent sodium lactate, and 2Kg of regulator sodium bicarbonate, and stir evenly;

[0027] Injection of profile control water shutoff agent: inject into a water injection well section by section: the first slug is cleaning slug, inject 200m 3 Surfactant lauryl dimethyl betaine (BS-12); inject 1050m in the second slug 3 The prepared composite profile control water shutoff agent; the third slug is injected 300m 3 Inorganic silica gel, where the second slug and the third slug can be injected alternately according to needs; the last injection is 180m 3 Oil displacing agent BS-12 slug. The water injection well injects 1730m of profile control agent according to the prescribed procedure ...

Embodiment 2

[0029] Preparation of composite profile control water shutoff agent: Add 10.5Kg polyacrylamide (molecular weight: 18 million, degree of hydrolysis: 27%) into 5m 3 Surface re-injection water, stir evenly; then add pre-crosslinked granular polyacrylate-kaolin composite resin (solid content: 35%) 100Kg, crosslinking agent chromium lactate 5.5Kg, regulator sodium carbonate 5Kg, and stir evenly;

[0030] Injection of profile control water shutoff agent: inject into a water injection well one by one, the first slug is cleaning slug, inject 100m 3 Surfactant BS-12; inject 850m in the second slug 3 The prepared composite profile control water shutoff agent; the third slug is injected 800m 3 Inorganic silica gel, where the second slug and the third slug can be injected alternately according to needs; the last injection is 270m 3 Oil displacing agent BS-12 slug. The water injection well injects 2020m of profile control agent according to the prescribed procedure 3 Afterwards, the wa...

Embodiment 3

[0032] Preparation of composite profile control water shutoff agent: Add 5Kg polyacrylamide (molecular weight 12 million, hydrolysis degree 20%) into 5m 3 Surface re-injection water, stir evenly; then add pre-crosslinked granular polyacrylate-bentonite composite resin (solid content: 30%) 25Kg, crosslinking agent chromium lactate 5Kg, regulator sodium bicarbonate 2Kg, and stir evenly;

[0033] Injection of profile control water shutoff agent: inject into a certain water injection well one by one, the first slug is cleaning slug, inject 150m 3 Surfactant BS-12; inject 900m in the second slug 3 The prepared composite profile control water shutoff agent; the third slug is injected 450m 3 Inorganic silica gel, where the second slug and the third slug can be injected alternately according to needs; the last injection is 250m 3 Oil displacing agent BS-12 slug. The water injection well injects 1750m of profile control agent according to the prescribed procedure 3 Afterwards, the ...

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PUM

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Abstract

The invention provides a compound profile modifying / water plugging agent. The compound profile modifying / water plugging agent comprises the following components in percentage by mass: 0.5-5% of pre-crosslinked particles, 0.1-0.3% of polyacrylamide, 0.1-0.4% of crosslinking agent, 0.04-0.5% of regulator and the balance of water. A preparation method of the compound profile modifying / water plugging agent comprises the following steps of adding a certain quantity of polyacrylamide into water by using a jet mixing hopper, and dissolving polyacrylamide for 30min; then, adding a certain quantity of pre-crosslinked particles, crosslinking agent and regulator, and uniformly stirring. The profile modifying / water plugging agent is good in profile modifying effect, capable of increasing the oil yield and reducing the water content, excellent in salt and temperature resistance, low in cost and simple in preparation method.

Description

technical field [0001] The invention relates to a composite profile control water shutoff agent and a preparation method thereof, belonging to the field of oil field chemistry. Background technique [0002] Profile control and water shutoff technology plays an important role in water control and stable production (production increase) measures in high water-cut oilfields. With the increasingly complex water flooding problems in high water-cut oilfields, the technical requirements for this field are getting higher and higher. In recent years, a lot of new progress has been made in the research and application of deep profile control liquid flow diversion agents, forming deep profile control technologies including weak gel, colloidal dispersion gel, bulky particles, flexible particles and other profile control and water shutoff agents. Among them, the plugging of the cross-linked polymer weak gel in the formation is dynamic, and the weak gel can migrate under certain condition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/5045C09K8/5083C09K8/512
Inventor 张晓瑞
Owner BEIJING ENRUIDA TECH
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