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Natural macromolecule modified starch profile control agent for oil field

A technology of natural macromolecule and profile control agent, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem of difficulty in injecting fresh water solution, and achieve the effect of expanding the scope of application, stable performance and improved thermal stability

Inactive Publication Date: 2008-02-13
CHENGDU HULIDA REAL ESTATE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to reports, the biggest disadvantage of HPC-SDS jelly is that it is difficult to inject dilute solution. If the mixing sequence is proper, HPC-SDS dilute solution does not have injection problems

Method used

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  • Natural macromolecule modified starch profile control agent for oil field
  • Natural macromolecule modified starch profile control agent for oil field
  • Natural macromolecule modified starch profile control agent for oil field

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Embodiment Construction

[0126] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0127] The present invention selects the aqueous solution free radical polymerization method according to the performance and structural design to obtain the natural polymeric starch profile-modifying main agent suitable for profile control, and the profile control that affects the product intrinsic viscosity, grafting rate, and graft polymer formation The various factors of system viscosity were studied experimentally, and the optimal starch graft copolymerization conditions were screened out by single factor test method and orthogonal test method.

[0128] The molecular structure determines the properties of polymers, and certain polymer properties correspond to specific molecular structures. The polymer synthesized in this paper is required to have two properties as the main agent for profile control: one is viscosity increasing, and the gel formed a...

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Abstract

The invention discloses a natural macromolecular modified starch profile-control agent applied to oil-fields, and the raw materials include natural macromolecular modified starch polymers (3000mg / L), crosslinking agent (A 750mg / L), crosslinking agent B (400mg / L) and acidity regulator (800mg / L). There are various raw materials for preparing profile control agent, the gel achieved after crosslinking with the crosslinking agent has strong hydroscopicity, i.e. the polymer gel has certain strength and certain heat / salt resisting property, and gel with stable performance can be achieved after crosslinking with the crosslinking agent.

Description

technical field [0001] The invention relates to an oil field natural polymer modified starch profile control agent. Background technique [0002] Exploration and exploitation of petroleum resources has always been an arduous and complicated process. Oil is an important resource for the development of the national economy, and it is the common goal of oilfield development workers to economically extract more oil from the ground. It is a long-term and arduous task to improve the recovery rate of oil fields, and it is a large-scale systematic project that comprehensively adopts various high-tech [1] , it runs through the oilfield development from beginning to end. With the continuous development of the oil field, a large amount of injected water scours, and the expansion, dissolution, and particle migration of the clay and cement in the oil layer cause the formation heterogeneity to become more and more serious. Due to the heterogeneity of the reservoir and the unfavorable o...

Claims

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Application Information

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IPC IPC(8): C09K8/42
Inventor 李华斌彭荣富
Owner CHENGDU HULIDA REAL ESTATE
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