Preparation of jelly glue dispersion for oil reservoir deep liquid diverting

A liquid flow diversion and jelly technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems that water-swelling particles cannot adapt to deep injection, cannot fully utilize pre-crosslinked particles, and the liquid is volatile

Inactive Publication Date: 2009-05-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the preparation conditions, the particle size of the water-swelling plugging agent is usually between 1 and 5 mm, and the particle size increases to 10-100 mm after absorbing water and swelling, and most of the water-swelling body passes through the formation by breaking through the pores. , this mechanism of action cannot fully play the role of pre-crosslinked particles, and the particle size of water-swellable particles cannot meet the requirements of deep injection
[0004] In the late 1990s, Chauveteau et al. proposed the theory of shear cross-linking and prepared different microgel systems (microgel) by this method, which have long plugging distance, strong selectivity, and good influence on formation physical and chemical conditions (temperature, pressure). , formation water salinity) insensitive and good stability, but the shear cross-linking equipment used to prepare micro-gel is a coaxial cylinder, the disadvantage of this equipment is that it is not suitable for large-scale industrial production, and the open container Liquid is volatile when heated and should only be used for laboratory research

Method used

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  • Preparation of jelly glue dispersion for oil reservoir deep liquid diverting
  • Preparation of jelly glue dispersion for oil reservoir deep liquid diverting
  • Preparation of jelly glue dispersion for oil reservoir deep liquid diverting

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Embodiment 1: prepare mass concentration in 100mL beaker and be 8000mg L -1 HPAM and 25mg·L -1 Cr(Ac) 3 According to the requirements of the shear rate, adjust the speed of the peristaltic pump to 10rpm, quickly suck the prepared tube flow shear cross-linking system into the silicone hose, connect the two ends of the hose, and place In a constant temperature water bath at 30°C, shear at a constant speed for 4 hours to the end. The liquid in the silicone tube was taken out, diluted 3 times, and stirred at 90° C. for 4 hours to obtain the required jelly dispersion.

[0061] Similarly, the rotation speed of the peristaltic pump was adjusted from low to high to 30, 50, 80, 100, 150 rpm, and the corresponding jelly dispersions were sequentially obtained according to the method in Example 1. Measure the hydrodynamic diameter d of jelly dispersion with Malvem Zetasizer 3000 HSa dynamic light scattering instrument, measure the result as follows Figure 4 As shown, the avera...

Embodiment 2

[0063] Embodiment 2: prepare mass concentration respectively in 100mL beaker and be 4000mg L -1 HPAM and 25mg·L -1 Cr(Ac) 3 and 8000mg·L -1 HPAM and 25mg·L -1 Cr(Ac) 3 Two kinds of tube flow shear crosslinking systems, according to the requirements of the shear rate, adjust the speed of the peristaltic pump to 40rpm (that is, 176s -1 ), quickly suck the prepared tube flow cross-linking system into the silicone tube respectively. Butt the two ends of the hose, place it in a constant temperature water bath at 30°C, and shear at a constant speed for 4 hours until the end. The liquid in the silicone tube was taken out, diluted 3 times with water, and stirred at 90° C. for 4 hours to obtain two required jelly dispersions. The microscopic morphology of the two jelly dispersions was determined by atomic force microscopy, as Figure 6 , Figure 7 shown. From Figure 6 It can be seen that the shape of the jelly dispersion in the solution is mainly in the form of columns or st...

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Abstract

The invention provides a preparation method of a jelly glue dispersion in-depth fluid flowing diverting agent, comprising the specific steps as follows: during a process when the jelly glue is formed by mixing part of hydrolyzed polyacrylamide and chromium acetate, a peristaltic pump applies a certain shearing force to a gelation system so as to lead the gelation system to form the jelly glue dispersion rather than integrated jelly glue. The jelly glue dispersion prepared by the method consists of jelly glue particles and water; and the particle diameter of the jelly glue dispersion can be controlled by adjusting the shearing speed. The jelly glue dispersion can be injected into the in-depth reservoirs; the adsorption and detention of the jelly glue dispersion particles in the hole can reduce the permeability of the high-permeability area, leads the subsequently injected liquid to be turned to the low-permeability area, and has the function of in-depth profile modification. The in-depth fluid flowing diverting agent has the advantages of low viscosity, good fluidity, good stability, long validity period, and the like, is insensitive to shearing and physical and chemical conditions of the reservoir, has controllable dimension, can design the diameter of the jelly glue dispersion with the aim of different stratums, and prevents blocking the stratum percolation surfaces.

Description

Technical field: [0001] The invention relates to a preparation method of a jelly dispersion, and the prepared jelly dispersion is used for diverting liquid flow in the deep part of an oil reservoir, so as to increase the recovery rate of crude oil. technical background: [0002] At present, the jelly-type deep fluid diversion agents at home and abroad mainly include the following categories: bulk gel (Bulk Gel), colloidal dispersion gel (Colloidal Dispersion Gel, referred to as CDG), water swelling body (Preformed Particle Gel) and micro Jelly (Microgel). The basic components of bulk jelly and colloidal dispersion jelly include polymer, crosslinking agent and other auxiliary agents. The commonly used implementation process is: inject polymer and cross-linking agent into the formation, shut down the well and wait for coagulation, form plugs to block the pore space of the formation to reduce the water phase permeability, and finally open the well for production (or restore wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/60
Inventor 王业飞向问陶由庆周薇陈凯杨光崔亚何龙于海洋赵福麟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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