Oil well plugging fluid

A plugging fluid, oil well technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of inability to withstand higher temperatures, easy to crush and deform, difficult to build bridges, etc., to achieve high strength, conducive to Formulation and application, low leakage effect

Active Publication Date: 2017-07-21
JINGZHOU JIAHUA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned plugging materials have the problems of low strength and inability to withstand higher temperatures, and are easily crushed and deformed during use, which makes it difficult to bridge and form a packing layer in the process of plugging drilling fractures

Method used

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Examples

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Effect test

preparation example Construction

[0027] The present invention has no special limitation on the preparation method of the modified phenolic resin, and the technical scheme for preparing the modified phenolic resin well known to those skilled in the art can be used. In the present invention, the preparation of the modified phenolic resin preferably comprises the following steps:

[0028] (1) phenol, water and concentrated sulfuric acid are mixed to obtain a mixed solution;

[0029] (2) heating the mixed solution that described step (1) obtains, drop formaldehyde, polycondensation reaction obtains phenolic resin;

[0030] (3) The phenolic resin obtained in the step (2) is mixed with propylene oxide propylene ether, and copolymerized to obtain a modified phenolic resin.

[0031] The present invention preferably mixes phenol, water and concentrated sulfuric acid to obtain a mixed solution. In the present invention, there is no special limitation on the mixing operation, and a mixing technical solution well known...

Embodiment 1

[0047] 45 parts by weight of water, 0.5 parts by weight of guar gum and 5 parts by weight of OP-10 are mixed to obtain mixed slurry;

[0048] The mixed slurry is mixed with 10 parts by weight of rigid lost circulation material, 35 parts by weight of flexible lost circulation material, 1 part by weight of composite fiber material and 3 parts by weight of strength adjustment to obtain oil well lost circulation fluid.

[0049] The rigid plugging material is composed of calcium carbonate, silicon dioxide and calcite in the following proportions:

[0050] Calcium carbonate 30 parts by weight

[0051] Silica 10 parts by weight

[0052] Calcite 30 parts by weight

[0053] The particle diameter of the calcium carbonate is 60 mesh, the particle diameter of the silicon dioxide is 100 mesh, and the particle diameter of the calcite is 40 mesh.

[0054] The flexible plugging material was prepared according to the following scheme: 10 parts by weight of phenol and 20 parts by weight of w...

Embodiment 2

[0058] 0.3 parts by weight of xanthan gum, 2 parts by weight of OP-20 and 45 parts by weight of water are mixed to obtain a mixed slurry;

[0059] The mixed slurry is mixed with 20 parts by weight of rigid lost circulation material, 25 parts by weight of flexible lost circulation material, 1 part by weight of composite fiber material and 3 parts by weight of strength adjustment to obtain oil well lost circulation fluid.

[0060] The rigid plugging material is composed of calcium carbonate, silicon dioxide and calcite in the following proportions:

[0061] Calcium carbonate 10 parts by weight

[0062] 30 parts by weight of silicon dioxide

[0063] 10 parts by weight of calcite,

[0064] The particle diameter of the calcium carbonate is 70 mesh, the particle diameter of the silicon dioxide is 150 mesh, and the particle diameter of the calcite is 50 mesh.

[0065] The flexible plugging material was prepared according to the following scheme: 15 parts by weight of phenol and 25...

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Abstract

The invention provides an oil well plugging fluid. The oil well plugging fluid comprises, by weight parts, 10-20 parts of rigid leaking stoppage material, 20-35 parts of flexible leaking stoppage material, 1-5 parts of composite fiber material, 0.5-5 parts of strength regulator, 0.1-0.5 part of tackifier, 0.5-5 parts of surfactant and 45-55 parts of water. The oil well plugging fluid is simple in formula and small in viscosity, apparent viscosity is reduced to 35 mPa.s, the oil well plugging fluid is favorable for on-site preparation and construction, invasion of formation fluid can be effectively restrained; a very high strength can be achieved after injection of a leaking layer, heat resistance is high, and the pressure bearing capacity can reach 12 MPa when the oil well plugging fluid is at 150 DEG C. A loss problem of return loss type leaking well is solved, the one-time leaking stoppage can be improved, and the leakage rate is as low as 5%. A method for preparing the oil well plugging fluid is simple and convenient, and the oil well plugging fluid is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of oil and gas engineering, in particular to an oil well plugging fluid. Background technique [0002] At present, the exploitation of most oilfields has entered the middle and late stages. Due to long-term oil production and water injection, the pressure of oil and gas layers has changed greatly. Some oil layers are depleted, and the fracture pressure drops; some oil layers become high pressure due to water injection, even exceeding the pressure of the overlying strata; some oil and gas layers may have increased permeability due to new fractures generated by fracturing. Multiple sets of pressure formations are formed in the open-hole section of the same wellbore, which may easily cause complex accidents such as blowout, lost circulation, well collapse, and pipe sticking. Lost circulation is a process in which drilling fluid leaks from the wellbore into caves, holes, fractures and high-porosity formations a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/426C09K8/467C09K2208/08C09K2208/18
Inventor 许明标刘卫红符合
Owner JINGZHOU JIAHUA TECH
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