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Water plugging method of establishing large-area chemical partition plate in gas-water interface of water-bearing gas reservoir

A gas-water interface and large-area technology, applied in chemical instruments and methods, earthwork drilling, sealing/isolation, etc., can solve the problems of small sealing range and low sealing strength, so as to prevent edge water from advancing and improve The effect of recovery factor and excellent salt interception ability

Active Publication Date: 2020-01-14
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a water blocking method for establishing a large-area chemical partition at the gas-water interface of a water-gas reservoir. The water system has problems such as small sealing range and low sealing strength. A high-strength, large-area, and thickness-controllable chemical barrier should be established at the gas-water interface of the water-gas reservoir to prevent edge water from advancing, bottom water Water ridge advance has great practical significance for efficient exploitation of edge-bottom water and gas reservoirs

Method used

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  • Water plugging method of establishing large-area chemical partition plate in gas-water interface of water-bearing gas reservoir
  • Water plugging method of establishing large-area chemical partition plate in gas-water interface of water-bearing gas reservoir
  • Water plugging method of establishing large-area chemical partition plate in gas-water interface of water-bearing gas reservoir

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Embodiment 1

[0048] A water shutoff method for establishing a large-area chemical partition at the gas-water interface of a water-containing gas reservoir, comprising the following steps in sequence:

[0049] (1) Prepare 100ml of an aqueous solution with a mass fraction of 3% m-phenylenediamine, and adjust the pH to 11 with NaOH solution;

[0050] (2) Prepare 100ml of a cyclohexane solution with a mass fraction of 0.5% 1,3,5-trimesoyl chloride, and add 0.5ml of octylphenol polyoxyethylene ether (OP-10) and stir evenly;

[0051] (3) Take 10ml of the water phase solution and inject it from the bottom of the sand filling pipe until the water phase solution reaches the middle of the sand filling pipe; then inject 5ml of the oil phase solution from the top of the sand filling pipe and wait to spread to form a polymer interlayer (For the plugging performance evaluation process, see figure 2 ), after two minutes of reaction, put the sand-filled tube into a 60°C oven to fully carry out the polym...

Embodiment 2

[0057] A water shutoff method for establishing a large-area chemical partition at the gas-water interface of a water-containing gas reservoir, comprising the following steps in sequence:

[0058] (1) Prepare 100ml of an aqueous solution of polyethyleneimine (PEI) with a mass fraction of 2% and a relative molecular mass of 600, and adjust the pH to 11 with NaOH solution;

[0059] (2) prepare 100ml mass fraction and be the cyclohexane solution of 0.5% 1,3,5-trimesoyl chloride, and add 0.5ml polyethoxytrisiloxane (ethoxy modified polytrisiloxane ) stir evenly;

[0060] (3) Take 10ml of the water phase solution and inject it from the bottom of the sand filling pipe until the water phase monomer reaches the middle of the sand filling pipe to establish the air-water interface; then inject 5ml of the oil phase solution from the top of the sand filling pipe and wait Spread to form a polymer interlayer (see the plugging performance evaluation process for figure 2 ), after two minute...

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Abstract

The invention relates to a water plugging method of establishing a large-area chemical partition plate in a gas-water interface of a water-bearing gas reservoir. The method comprises the following steps that (1) an aqueous-phase solution is injected into a gas-water interface of a gas reservoir and is transported to a water layer under the effect of diffusion and dispersion; (2) an oil-phase solution is injected into the gas-water interface of the gas reservoir and is spread in the gas-water interface to replace the gas-water interface with an oil-water interface; (3) an aqueous-phase monomeris diffused towards the oil layer, and a region, close to an oil phase, of the oil-water interface generates polymerization reaction with an oil-phase monomer to form a microporous polymer interlayer;and (4) formation water permeates into the polymer interlayer under the effect of a pressure difference, and mineral ions and impurities continuously deposit to form scales on the polymer interlayerto form a water-impermeable polymer interlayer. The method is reliable in principle and simple and convenient to operate, can effectively solve the problems of small plugging range, low plugging strength and the like of a common water plugging system in the process of water invasion treatment of the edge-bottom water-bearing gas reservoir and has a great practical significance of efficient miningthe edge-bottom water-bearing gas reservoir.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a water shutoff method for establishing a large-area chemical partition at the gas-water interface of a water-containing gas reservoir. Background technique [0002] The energy of the water body in the edge-bottom water gas reservoir is huge. If reasonable water control measures are not taken during the development process, the gas reservoir is extremely vulnerable to water intrusion, and there will be edge water advancement, bottom water coning, and bottom water ridge ingress, resulting in water breakthrough in the gas well. , thereby reducing the gas recovery rate. [0003] For water intrusion in gas reservoirs, profile control and water shutoff, production rationing and water control, and drainage and gas recovery are three commonly used means of water control in gas reservoirs. Among them, production rationing and water control can delay the water breakthrough ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13C09K8/508
CPCC09K8/5086E21B33/13
Inventor 田正坤郭平陈馥刘煌汪周华
Owner SOUTHWEST PETROLEUM UNIV
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