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Production-increasing method by water-plugging and fracturing

A hydraulic fracturing and viscous pressure technology, which is applied in earthwork drilling, wellbore/well components, and production fluids, etc., can solve the problems of poor control of fracture height, easy pressure to penetrate the bottom water layer, and water flooding, etc. The effect of reducing reservoir permeability damage, increasing single well production and controlling water production

Active Publication Date: 2014-07-02
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Practice has proved that the current methods still have poor ability to control the fracture height, and are easy to press through the bottom water layer, causing the water content of oil (gas) wells to rise rapidly, or even flooded, which affects the stimulation effect of oil and gas wells and increases Reduced the difficulty of oil (gas) field development and subsequent reservoir stimulation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for water plugging and fracturing stimulation, comprising the steps of:

[0032] a. Mix 5 parts of crack shielding agent with 100 parts of water;

[0033] b. At a temperature of 0°C, inject the mixture a into the cracks opened in the well layer to shield the pores of the reservoir;

[0034] c. Take 5 parts of bottom water reservoir plugging agent and 100 parts of low-viscosity fracturing fluid and mix;

[0035] d. Inject the mixture in step c into the cracks opened in the oil layer or gas layer at a temperature of 0°C, and seal the lower water layer after settling;

[0036] e. Perform sanding and fracturing operations on the upper oil layer or gas layer of the reservoir;

[0037] f. Close the well and wait for condensation, and the construction is over.

[0038] The crack shielding agent is formed by mixing 50% stearic acid, 40% rosin and 10% bone glue in mass ratio.

[0039] The bottom water oil reservoir plugging agent is a mixture composed of 60% silicon...

Embodiment 2

[0047] A method for water plugging and fracturing stimulation, comprising the steps of:

[0048] a. Mix 7 parts of crack shielding agent with 100 parts of clear water;

[0049] b. At a temperature of 45°C, inject the mixture a into the cracks opened in the well layer to shield the pores of the reservoir;

[0050] c. Take 10 parts of bottom water reservoir plugging agent and 100 parts of low-viscosity fracturing fluid and mix;

[0051] d. At a temperature of 45°C, inject the mixture in step c into the cracks opened by the oil layer or gas layer, and seal the lower water layer after settling;

[0052] e. Perform sanding and fracturing operations on the upper oil layer or gas layer of the reservoir;

[0053] f. Close the well and wait for condensation, and the construction is over.

[0054] The crack shielding agent is formed by directly mixing 70% stearic acid, 20% rosin and 10% bone glue in mass ratio.

[0055] The bottom water oil reservoir plugging agent is a mixture compos...

Embodiment 3

[0063] A method for water plugging and fracturing stimulation, comprising the steps of:

[0064] a. Mix 6 parts of crack shielding agent with 100 parts of clear water;

[0065] b. At a temperature of 30°C, inject the mixture of a into the cracks opened in the well layer to shield the pores of the reservoir;

[0066] c. Mix 7 parts of bottom water reservoir plugging agent and 100 parts of low-viscosity fracturing fluid;

[0067] d. At a temperature of 25°C, inject the mixture in step c into the cracks opened by the oil layer or gas layer, and seal the lower water layer after settling;

[0068] e. Perform sanding and fracturing operations on the upper oil layer or gas layer of the reservoir;

[0069] f. Close the well and wait for condensation, and the construction is over.

[0070] The crack shielding agent is formed by mixing 60% stearic acid, 30% rosin and 10% bone glue by mass ratio.

[0071] The bottom water reservoir plugging agent is a mixture composed of 70% silicon ...

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PUM

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Abstract

The invention discloses a production-increasing method by water-plugging and fracture, comprising the following steps: mixing 5 to 7 proportions of crack shielding agents with 100 proportions of clean water; injecting a mixture a into pressed cracks of a well layer under the temperature of 0 to 45 DEG C; shielding an aperture in a storage layer; mixing 5 to 10 proportions of bottom water oil reservoir plugging agent with 100 proportions of low-viscosity fracturing fluid; injecting the mixture generated in step c into cracks pressed in oil layer or gas layer under the temperature of 0 to 45 DEG C; plugging lower water layer after deposition of the mixture; carrying out sand-adding and fracturing operation on the oil layer or the gas layer at the upper part of the storage layer; closing a well and waiting for condensation then fishing the construction. In the method, the bottom water oil reservoir type or the bottom water gas reservoir type gas well bottom is plugged, the jumping-up of bottom water is prevented, simultaneously the crack height is controlled effectively, the extending-down of the crack is prevented, therefore, the aims of plugging the water layer is achieved and the single-well output of an oil well or a gas well is improved.

Description

technical field [0001] The invention relates to a method for increasing production by water plugging and fracturing, which is mainly applicable to the production stimulation transformation of oil wells in bottom water reservoirs or gas wells in bottom water gas reservoirs. Background technique [0002] For oil (gas) reservoirs with bottom water characteristics, generally the oil (gas) layer and the lower water layer are in the same sand body, and there is no interlayer or the interlayer is very thin, showing the characteristics of upper oil (gas) and lower water. Therefore, the fracture height must be controlled during fracturing, so as not to press through the lower water layer and cause water production in the reservoir during production. In order to prevent the bottom water from creeping up, the fracturing mode of "three small and one low" is often used in production fracturing, that is, small sand volume, small displacement, small sand ratio and low injection degree. Wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267E21B33/13
Inventor 任雁鹏马托达引朋苏伟东蒋文学
Owner BC P INC CHINA NAT PETROLEUM CORP
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