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Selective water-blocking, oil-permeable and sand-preventing proppant as well as preparation method and application thereof

A proppant and selective technology, which is applied in crude oil production of sand producing oil wells and high water content fields, can solve the problems of poor chemical water shutoff selectivity, affecting normal production of oil wells, and limited mechanical water shutoff, so as to achieve less pollution and save underground Reservoir resources, complete effect of gel breaking

Inactive Publication Date: 2016-04-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mechanical water plugging is limited by the well conditions, the validity period is short, and repeated operations are required, which affects the normal production of oil wells
Chemical water plugging has poor selectivity, low success rate, high construction cost, short validity period, and high temperature resistance; it is also difficult to achieve the desired effect in oil and gas wells with high water content and sand production. The reason is that due to sand production, the selective chemical proppant used Therefore, it is imminent to seek a new type of selective water and sand control proppant and sand control and water plugging technology for oil wells with high water content and sand production.

Method used

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  • Selective water-blocking, oil-permeable and sand-preventing proppant as well as preparation method and application thereof
  • Selective water-blocking, oil-permeable and sand-preventing proppant as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] This embodiment provides a method for preparing a selective water-repelling, oil-permeable and sand-controlling proppant, wherein the preparation method includes the following steps:

[0062] a, 2kg sintered ceramsite (particle size 0.5-0.8mm, density 1.45g / cm 3 , maximum strength 50MPa) heated to 260°C and placed in a sand mixer for stirring; when the ceramsite cools down to 200°C, add 0.1kg of phenolic resin and 0.04kg of polyvinylidene fluoride, and stir evenly to obtain a surface-coated hydrophobic and lipophilic Ceramsite of type resin film;

[0063] b. Then add 0.016kg plasticizer (dioctyl phthalate), stir evenly, add 0.005kg coupling agent (aminopropyltriethoxysilane.), stir evenly, add 0.012kg curing agent (6 Methylenetetramine), stir evenly, make hydrophobic-lipophilic resin film solidify; Add lubricant (calcium stearate) before agglomeration, and stir at hydrophobic-lipophilic resin film beginning to solidify; After the resin film is completely cured, it is ...

Embodiment 2

[0065] This example provides the application of the selective water-repelling, oil-permeable and sand-controlling proppant prepared in Example 1 in water plugging and sand-controlling of oil wells. The application includes the following steps:

[0066] (1), move up: wash the pressure oil well, and pull out the pipe string in the well;

[0067] (2) Sand washing: put the sand washing pipe into the oil well to detect the sand surface, if there is sand, wash the sand to the bottom of the artificial well;

[0068] (3) Drilling well: run the drilling plan to the oil well;

[0069] (4) Scraper: Scrape the well with a spring scraper in the oil well, and backwash the well with hot water for two weeks;

[0070] (5), lower construction pipe string 1: a combined pipe string with a pen tip at the bottom that is lowered into the oil well;

[0071] (6) Install high-pressure wellhead;

[0072] (7) The pipeline on the ground surface, and inject solid-free clean sand-carrying liquid into the...

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Abstract

The invention provides a selective water-blocking, oil-permeable and sand-preventing proppant as well as a preparation method and an application thereof. The proppant comprises ceramsite and a hydrophobic and oleophylic resin film coating the surface of the ceramsite, and the selective water-blocking, oil-permeable and sand-preventing proppant comprises loose particles with the dispersion rate larger than or equal to 98%; the particles have the particle size of 0.4-0.8 mm, the sphericity of 0.9-1.0 and the roundness of 0.9-1.0. The selective water-blocking, oil-permeable and sand-preventing proppant can block water in a water-containing oil layer conveniently and effectively and has oil-permeable and sand-preventing functions, so that a large number of underground oil poll resources can be saved. The selective water-blocking, oil-permeable and sand-preventing proppant is applied to water shutoff and sand prevention of oil wells, has sand-producing hollow stratum filling and propping effects of common sand-preventing measures and can well prevent sand; meanwhile, the application process is convenient to operate, simple in technology and high in water-blocking and sand-preventing success rate, causes no pollution to the stratums and does not affect the permeability of the stratums.

Description

technical field [0001] The invention relates to a selective water-repelling, oil-permeable and sand-preventing proppant and its preparation method and application, which is especially suitable for crude oil exploitation in oil wells with high water content and sand production, and belongs to the technical field of oil field chemistry. Background technique [0002] In the middle and late stages of oilfield development, water production from oil wells is becoming more and more serious, which has become a major problem in oilfield development. With the continuous increase of steam huff and puff cycles and water injection, the water cut of oil wells has risen sharply, causing many oil wells in the block to be shut down due to high water cut. How to control the water output of oil wells and increase the production of single wells is a technical problem that needs to be solved urgently. [0003] Traditional water blocking methods are mostly mechanical water blocking and chemical ...

Claims

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Application Information

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IPC IPC(8): C09K8/57C09K8/575C09K8/80E21B33/13E21B43/04
CPCC09K8/805C09K8/572C09K8/5753E21B33/13E21B43/04
Inventor 曾立桂张飘石朱峻峰饶德林柳转阳唐明王善强毛军孙世义郭玲徐波贾永伟邹吉辉朱宏亮沈鸿雁单忠利刘伟李洪英
Owner PETROCHINA CO LTD
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