Performance evaluation and application of modified urea–formaldehyde resin water shutoff agent
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- 作者：Huai Zhu Liu ; Min Zhou ; Jun Wu ; Haiwei Lu…
- 关键词：Modified urea–formaldehyde resin ; Water shutoff ; Curing time ; Thickening agent ; Solid filling material ; Plugging capacity ; Pilot test
- 刊名：Journal of Petroleum Exploration and Production Technology
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：7
- 期：1
- 页码：155-160
- 全文大小：773KB
- 刊物主题：Geology; Industrial and Production Engineering; Energy Technology; Offshore Engineering; Industrial Chemistry/Chemical Engineering; Monitoring/Environmental Analysis;
- 出版者：Springer Berlin Heidelberg
- ISSN：2190-0566
- 卷排序：7
文摘
Because of bad cement job quality, water is one big problem that causes reduction in oil production, higher water cut and lower eventual oil recovery. Usually the main way to solve this problem would be to use a cement nonselective water shutoff agent. But this agent has small plugging radius, big field test risk, poor resistance to acid/alkali and pollutes the formation seriously. Therefore, one effective shutoff agent which can lower pollution from the formation must be developed. Making use of a large number of experiments and hard work, the curing agent, thickening agent and solid filling material are chosen. In this way modified urea–formaldehyde resin water shutoff agent is developed. The formula is as follows: 0.1–0.35 % curing agent GH-1, 0.1–1 % thickening agent KYPQ and 10–20 % solid filling material CT-1. Its performance such as curing time, viscosity and plugging strength is also studied in laboratory. Its curing time is controllable from 12 to 1200 min and the viscosity is flexible from 30 to 10,000 mPa s. Injecting this new shutoff agent into sand packs whose permeability is 7 μm2, the displacement pressure is up to 7 MPa. After maintaining at 70 °C in an oven for 8 h, the breakthrough pressure is more than 20 MPa and the plugging ratio is more than 99 %. This water shutoff agent is successfully used in 25 oil wells. Three typical wells are chosen as examples to plug channeling or bottom water. The result of pilot test shows that the cumulative quantity of oil is 14,711 tons and the water cut rises slowly.