Selective low density water shutoff agent, and preparation technology and construction technology of water shutoff agent

A water blocking agent and low-density technology, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of not increasing crude oil production, difficulty in injecting chemical plugging agents, and few data for water detection in well logging, etc. Achieve strong suspension stability, easy preparation and construction, and ensure health and safety

Inactive Publication Date: 2019-07-19
深圳海程油田技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Selective low density water shutoff agent, and preparation technology and construction technology of water shutoff agent
  • Selective low density water shutoff agent, and preparation technology and construction technology of water shutoff agent
  • Selective low density water shutoff agent, and preparation technology and construction technology of water shutoff agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a selective low-density water blocking agent, in parts by weight, the water blocking agent includes: 100 parts of superfine light calcium carbonate powder, 10 parts of silicon-based unsaturated polyester resin, polybasic fatty acid ester 3 parts, 2 parts of biopolymer, 20 parts of high temperature consolidation agent.

[0032] Wherein, the average particle diameter of the ultra-light calcium carbonate powder is not greater than 15 μm, and the calcium carbonate content in the ultra-fine light calcium carbonate powder is not less than 95 wt%. The silicon-based unsaturated polyester resin may be a high-temperature silicon-based epoxy resin, wherein the solid content is greater than 60%. The average particle size of the polybasic fatty acid ester is not greater than 15 μm, and the effective substance content thereof is not less than 80%. In this embodiment, the polybasic fatty acid is the product of the biological reaction of the oil—glycolipid BS, ...

Embodiment 2

[0043] This embodiment provides a selective low-density water blocking agent, in parts by weight, the water blocking agent includes: 100 parts of superfine light calcium carbonate powder, 5 parts of silicon-based unsaturated polyester resin, polybasic fatty acid ester 2 parts, 1 part of biopolymer, 15 parts of high temperature consolidation agent.

[0044] Wherein, the average particle diameter of the ultra-light calcium carbonate powder is not greater than 15 μm, and the calcium carbonate content in the ultra-fine light calcium carbonate powder is not less than 95 wt%. The solid content in the silicon-based unsaturated polyester resin is greater than 60%. The average particle size of the polybasic fatty acid ester is not greater than 15 μm, and the content of effective substances is not lower than 80%. The average particle size of the biopolymer is not greater than 15 μm, and the viscosity is not lower than 100 mpa.s.

[0045] This embodiment also provides a construction pr...

Embodiment 3

[0050] This embodiment provides a selective low-density water blocking agent, in parts by weight, the water blocking agent includes: 100 parts of superfine light calcium carbonate powder, 8 parts of silicon-based unsaturated polyester resin, polybasic fatty acid ester 2.5 parts, 1.5 parts of biopolymer, 18 parts of high temperature consolidation agent.

[0051] Wherein, the average particle diameter of the ultra-light calcium carbonate powder is not greater than 15 μm, and the calcium carbonate content in the ultra-fine light calcium carbonate powder is not less than 95 wt%. The solid content in the silicon-based unsaturated polyester resin is greater than 60%. The average particle size of the polybasic fatty acid ester is not greater than 15 μm, and the content of effective substances is not lower than 80%. The average particle size of the biopolymer is not greater than 15 μm, and the viscosity is not lower than 100 mpa.s.

[0052] This embodiment also provides a constructi...

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Abstract

The invention discloses a selective low density water shutoff agent which comprises the following components in parts by weight: 100 parts of superfine light calcium carbonate powder, 5-10 parts of silica-based unsaturated polyester resin, 2-3 parts of poly fatty acid ester, 1-2 parts of biopolymer and 15-20 parts of high-temperature consolidation agent. The water shutoff agent is small in particle size, good in dispersity in water, strong in suspension stability, low in density and easy to prepare and construct, can meet construction requirements of a long-time water shutoff task in a deep well and an ultra deep well, has an effect water shutoff and no oil shutoff, and no toxic or side effects on a human body and can be widely used for selective water shutoff of a horizontal well, edge water control, bottom water coning and inter-reservoir water breakthrough. The invention further discloses a preparation technology and a construction technology of the water shutoff agent. The water shutoff agent is simple to prepare and can be constructed on site; the construction technology is simple and quick; and the water shutoff agent has a wide application scope, and significant economic andenvironmental benefits.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/504C09K8/508C09K8/84C09K8/88
CPCC09K8/5045C09K8/5086C09K8/512C09K8/845C09K8/885C09K8/887
Inventor 童建军苏长明
Owner 深圳海程油田技术服务有限公司
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