Plugging agent with high bearing strength for deep drilling and preparation method thereof

A technology of high pressure-bearing and loss-stopping agent, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of fragile strata and difficulty of sealing with loss-stopping agent, etc., so as to improve the cementing performance and improve the pressure-bearing capacity. ability, the effect of saving drilling cycle

Inactive Publication Date: 2019-06-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem that the existing plugging agents in the prior art are difficult to plug malignant leakage and easily broken formations, the present invention proposes a high-pressure-bearing-strength plugging agent for deep drilling

Method used

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  • Plugging agent with high bearing strength for deep drilling and preparation method thereof
  • Plugging agent with high bearing strength for deep drilling and preparation method thereof
  • Plugging agent with high bearing strength for deep drilling and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take 100 parts of Jiahua G grade oil well cement, 0.5 parts of lignosulfonate dispersant (GMP-3 chrome-free thinner), 1.2 parts of polyvinyl alcohol fluid loss reducer (FSAM non-permeable fluid loss reducer), sulfur Calcium aluminate cement expansion agent 1 part (DZP lattice expansion agent), mix well (dry mixing).

[0042] Add 44 parts of water to the slurry cup of the M3080 constant speed stirrer, and add 2 parts of silicon dioxide with a particle size between 30 and 60 nm and 0.001 part of silicone defoamer silicone oil under stirring at 2000 rpm.

[0043] Quickly add the dry mixture into the slurry cup of the constant speed stirrer, and stir at high speed (12000 rpm) for 50 seconds. Add 3 parts of steel wires with a diameter ranging from 0.1 to 1 mm and a length ranging from 5 to 30 mm into the prepared cement slurry, and stir at a low speed for 20 seconds to prepare the high compressive strength plugging agent of the present invention.

[0044] Pour the plugging ...

Embodiment 2

[0046] Take 100 parts of Jiahua G grade oil well cement, 0.5 parts of lignosulfonate dispersant (FCLS), 1.2 parts of polyvinyl alcohol (RC800) fluid loss reducer, calcium sulfoaluminate cement expansion agent (DZP lattice expansion agent) 1 part, mix well (dry blend).

[0047] Add 44 parts of water to the slurry cup of the M3080 constant speed stirrer, and add 1 part of silicon dioxide with a particle size range of 30-60 nm and 0.001 part of silicone defoamer methyl silicone oil under stirring at 2000 rpm. Quickly add the dry mixture into the slurry cup of the constant speed stirrer, and stir at high speed (12000 rpm) for 50 seconds. Add 5 parts of steel wires with a diameter ranging from 0.1 to 1 mm and a length ranging from 5 to 30 mm into the prepared cement slurry, and stir at a low speed for 20 seconds to prepare the high bearing strength plugging agent of the present invention.

[0048] Squeeze this lost circulation agent into the cracks of the core block, and cure it i...

Embodiment 3

[0050] Take 100 parts of Jiahua G grade oil well cement, 1 part of lignosulfonate dispersant (FCLS), 2 parts of polyvinyl alcohol fluid loss reducer polyvinyl alcohol (RC800) fluid loss reducer, calcium sulfoaluminate type Cement expansion agent (DZP lattice expansion agent) 1.5 parts, mix well (dry mixing).

[0051] Add 44 parts of water to the slurry cup of the M3080 constant speed stirrer, and add 2 parts of nano-silica with a particle size between 30 and 60 nm and 0.002 parts of silicone defoamer methyl silicone oil under stirring at 2000 rpm. Quickly add the dry mixture into the slurry cup of the constant speed stirrer, and stir at a high speed of 12000 rpm for 50 seconds. Add 3 parts of fine steel wires with a diameter of 0.1 to 1mm and a length of 5 to 30mm into the cement slurry prepared above, and stir at a low speed for 20 seconds to obtain the high pressure strength plugging agent No. 2 of the present invention .

[0052] Pour the plugging agent into the curing ta...

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Abstract

The invention relates to a plugging agent with high bearing strength for deep drilling and a preparation method thereof, belonging to the field of ultra-deep petroleum drilling engineering. The plugging agent with high bearing strength for deep drilling comprises cement, a cement additive, a nanometer filling material, a micro-fine fiber material and water; on the basis of 100 parts by weight of the cement, the content of the nanometer filling material is 0.5 to 5 parts by weight, preferably 1 to 3 parts by weight; the content of the micro-fine fiber material is 1 to 10 parts by weight, preferably 3 to 6 parts by weight; and the content of the water is 20 to 60 parts by weight. According to the invention, the plugging agent with high bearing strength can greatly improve compressive strength and flexural strength of a plugging slurry, and has significant plugging effect. The plugging agent provided by the invention is applicable to plugging lateral cracks, malignant leakage caused by broken rock strata and long open hole segments of multi-pressure series of strata; cementation performance between the plugging agent and a leakage channel wall and the impact crushing resistance of formed cement stone are improved; and the construction requirements of plugging for long open hole segments and plugging under high strength of 30 MPa or above can be solved.

Description

technical field [0001] The invention relates to a treatment agent for drilling lost circulation in ultra-deep petroleum drilling engineering, and furthermore, relates to a high pressure-bearing strength plugging agent for deep drilling and a preparation method thereof. Background technique [0002] Lost circulation is one of the common complex situations in the drilling process. It not only consumes drilling time and loses mud, but also may cause a series of complicated situations such as pipe sticking, blowout, well collapse, etc., and even lead to the scrapping of the wellbore, resulting in major economic losses . With the further expansion of the field of oil and gas exploration and development, the formations encountered are becoming more and more complex, and there are low-pressure oil and gas reservoirs, fractures, and karst caves in the strata that are seriously leaked; in the oilfields that have entered the middle and late stages of exploration and development, the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C09K8/487C09K8/493
Inventor 王西江李大奇刘金华陈红壮张国
Owner CHINA PETROLEUM & CHEM CORP
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