Selective low-density water blocking agent and preparation and construction technology thereof

Abstract

The invention discloses a selective low-density water blocking agent. The selective low-density water blocking agent is prepared from, by weight, 100 parts of superfine light calcium carbonate powder,5-10 parts of silica-based unsaturated polyester resin, 2-3 parts of multielement fatty acid ester, 1-2 parts of a biopolymer and 15-20 parts of a high-temperature solidification agent. The water blocking agent is small in size, good in in-water dispersity, high in suspension stability, low in density, easy to prepare and construct, and capable of meeting the construction requirement of deep wells and superdeep wells for long-term water blocking work, has the effect of blocking water while not blocking oil, has no toxic or side effects on the human body, and can be widely applied to selectivewater blocking, edge water controlling, bottom water coning and water channeling among reservoirs for horizontal wells. The invention further discloses a preparation and construction technology of the water blocking agent. The water blocking agent is easy to prepare, site operation can be achieved, the construction technology is simple and convenient, the application range is wide, and economic and environment-friendly benefits are significant.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and relates to a water shutoff agent and its preparation process, in particular to a selective low-density water shutoff agent and its preparation and construction process. Background technique [0002] Oil well water production is a serious problem faced by oilfield production. The water produced by oil wells comes from different sources: one is from the edge water between reservoirs; the other is from the bottom water of the reservoir; the third is from reservoir water or Injecting water. Water shutoff agents are usually used to control the output of water in oil wells, increase the oil content of crude oil production wells, and reduce safety risks. The purpose of water shutoff in crude oil production wells is to control the output of injected water, edge water or bottom water. [0003] The research on water shutoff agents started earlier in foreign countries, and has a history of m...

AI Technical Summary

Problems solved by technology

Due to the particularity of horizontal wells, the complex operation process, the lack of logging data to find water, and the particularity of staged fracturing completion of horizontal wells, all of these increase the difficulty of water shutoff

The domestic and foreign research on water plugging technology for horizontal wells aims at the serious water channeling problems of bottom water, edge water and injection water commonly encountered in the production of horizontal wells and deep oil and gas wells. The research on chemical plugging agents for horizontal wells has just started. Flat wells have long intervals and are usually completed with open holes or slotted screens, which makes it difficult to inject chemical plugging agents

At present, the injection technology of horizontal well plugging agent still uses the vertical well operation technology, which leads to poor effect of measures, low water plugging efficiency and no increase in crude oil production

Images