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Novel emulsion organic resin selective plugging agent

An organic resin and emulsion technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as poor selectivity, high cost, formation damage, etc., to overcome poor selectivity, stable emulsion system, and selective water blocking. good performance

Active Publication Date: 2011-01-05
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a new type of emulsion organic resin plugging agent, which can overcome the problems of high cost, poor selectivity and damage to the formation of existing water blocking agents

Method used

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  • Novel emulsion organic resin selective plugging agent

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Embodiment Construction

[0009] The formula selection of the new emulsion organic resin plugging agent for the core test: polyacrylamide (HPAM) 0.4%, liquid organic resin 20%, surfactant (OP-10) 1.0%, curing agent 0.04%, and the balance is water; The percentages here are percentages by weight. In the present invention, the polyacrylamide can be cationic polyacrylamide, the liquid organic resin can be petroleum resin, and the curing agent can be methyl ethyl ketone peroxide. Mix and stir polyacrylamide, liquid organic resin, and surfactant for 20 minutes. After stirring evenly, add curing agent and water and mix evenly.

[0010] Next, the core test evaluation is carried out.

[0011] (1) Selection of rock cores: artificial rock cores are made of quartz sand with a particle size of 177-500 μm, mixed with 3% epoxy resin / ethylenediamine mixture as a cement, and made under a pressure of 8-16 MPa with a diameter of 25 mm and a length of The core of about 50mm can be used after curing and drying at 90°C fo...

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Abstract

The invention discloses a novel emulsion organic resin selective plugging agent, which comprises the following components: polyacrylamide, liquid organic resin, surfactant and curing agent. The novel emulsion organic resin selective plugging agent has the characteristics of temperature resistance, salt tolerance, stable emulsion system and good selective plugging performance, and solves the problems that the conventional plugging agent has poor selectivity and damages the stratum. The water plugging rate of the selective plugging agent is more than 90 percent; the oil plugging rate is less than 20 percent; the temperature resistance reaches 150 DEG C; the highest mineralization tolerance (based on sodium chloride) is 40,000 mg / L (seawater is taken as liquid preparation basis); and the suspension stabilizing time is more than 96 hours.

Description

technical field [0001] The invention relates to an emulsion organic resin blocking agent with good selective water blocking performance. Background technique [0002] Oil well water plugging is an important technology to improve exploration and development benefits. For oil and gas wells where the oil and water layers are interlaced, and the separation of the oil layer and the water layer cannot be ensured technically, in order to achieve the purpose of reducing water and increasing oil production, a highly selective water blocking agent is required. Selective water plugging generally includes two meanings: one is that it can selectively enter the high-permeability water outlet large pores, that is, the low-permeability oil layer enters little or no entry; Oil plugging. [0003] At present, the water shutoff materials used in oil fields mainly include modified montmorillonite and cement-based inorganic particle water shutoff agents, which not only have poor selectivity, bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42
Inventor 童志能莫成孝杨振宇刘庆旺范振忠
Owner CHINA NAT OFFSHORE OIL CORP
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