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Penetrating selective plugging agent and preparation method and application method thereof

A selective and plugging technology, applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc., can solve the problem of non-selective water plugging technology, unclear water output horizon, packer failure, loss of reserves and other problems, to reduce the risk of encountering other ions, improve the blocking ability, and strengthen the blocking effect.

Inactive Publication Date: 2015-07-08
DANO BEIJING OILFIELD SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although water plugging by conventional methods can control ineffective water production, most of the reserves are lost, and along with the rupture of the interlayer cement sheath in some wells, serious interlayer channeling phenomenon, packer failure, and non-selective plugging Water technology is limited by interlayer water and unclear water horizons

Method used

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  • Penetrating selective plugging agent and preparation method and application method thereof
  • Penetrating selective plugging agent and preparation method and application method thereof
  • Penetrating selective plugging agent and preparation method and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment relates to several groups of permeation selective plugging agents, and the formulations are shown in the following table:

[0030]

[0031] According to the formula in the above table, first add retarder and coagulant to clear water, stir to dissolve; add viscosifier and stabilizer under high-speed stirring at a speed of 5000r / min to make the dispersion even; finally add the main agent, Under the high-speed stirring of 13000r / min, the permeation-selective blocking agent in suspension state was obtained.

Embodiment 2

[0033]This embodiment relates to the detection of the plugging effect of the permeable selective plugging agent of Embodiment 1, and the permeability and plugging rate are detected by the core displacement experiment. The experimental core is a quartz sand epoxy resin cemented artificial core. The geometric dimensions are: height × width × length = 4.5 × 4.5 × 15cm. In order to simulate the formation of large pores in the formation, holes are drilled along the length of the core. The depth of the holes is 3cm and 6cm respectively. and 9cm, the hole diameters are 0.8cm, 1.6cm and 2.5cm respectively, fill the holes with sand, and the sand particle size is between 35-40 mesh. The injection rate during the experimental water flooding process was 0.6mL / min.

Embodiment 21

[0035] This embodiment relates to a single rock core experiment, and the operation steps are as follows:

[0036] ①. Core water permeability measurement before and after drilling sand filling;

[0037] ②. inject embodiment 1.1 permeation selective blocking agent;

[0038] ③. Place the core under the experimental conditions for 24 hours;

[0039] ④. Water flooding until the pressure is stable, then calculate the permeability and plugging rate.

[0040] The experimental results are shown in the table below:

[0041]

[0042] It can be seen from the above table that under the same pore diameter, the plugging rate increases with the increase of the pore length; under the same pore length, the plugging rate increases with the increase of the pore diameter. When the pore length is 9cm and the pore diameter is 2.5cm, the plugging rate can reach 90.9% after waiting for 24 hours, which shows that the permeable selective plugging agent of the present invention has good plugging ab...

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Abstract

The invention relates to a penetrating selective plugging agent which is prepared as follows: 400 parts by weight of water is added with a main agent comprising 10-20 parts by weight of ultrafine oilwell cement and 80-100 parts by weight of superfine ore slag, 15-30 parts by weight of a tackifier, 0-2 parts by weight of a coagulation accelerator, 0-2 parts by weight of a retarder and 1-10 parts by weight of a stabilizer; and the average particle size of the main agent is 15 to 16 mum. The penetrating selective plugging agent has good stability, and is wide in adaptation range of water mineralization degree, low in viscosity, and good in pumping performance, after the penetrating selective plugging agent is squeezed into the formation, a large pore path can be selectively plugged, and the penetrating selective plugging agent may not enter medium-low permeability formation, may not damage the formation and reservoir stratum, and has good resistance to high temperature. The invention also relates to a preparation method and an application method of the penetrating selective plugging agent, a better plugging effect can be played, plugging is achieved without sealing off, and mud acid can be used for plugging releasing.

Description

technical field [0001] The invention relates to a permeation-selective blocking agent, and at the same time, the invention also relates to a preparation method and a use method of the permeation-selective blocking agent. Background technique [0002] 80% of the oil fields in China have entered the water flooding development mode. At present, they have reached the stage of high water cut development. According to statistics, the comprehensive water content of most oil fields is as high as 80%, and the comprehensive water content of some old oil fields is as high as 90%. . In the long-term water injection development of oilfields, due to the heterogeneity of the reservoir, the difference in oil and water viscosity and the imbalance in the oil-water well group, the injected water will inevitably burst into the high-permeability zone and channel to the production well, and flow to the low-permeability zone. Layer sweep is low, resulting in low circulation efficiency of injected...

Claims

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Application Information

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IPC IPC(8): C09K8/508E21B33/13
Inventor 潘卫国
Owner DANO BEIJING OILFIELD SERVICES
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