Well drilling high strength pressure-bearing plugging agent and application thereof

A high-strength, plugging agent technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of easy softening of nutshell materials, affecting the effect of pressure-bearing plugging, and damage to the plugging layer. Achieve the effects of improving the ability to resist bottom hole pressure fluctuations, good toughness, and improving the pressure bearing capacity of the formation

Inactive Publication Date: 2020-03-10
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after soaking in drilling fluid and the high temperature of the formation, the shell material is easy to soften and carbonize, resulting in the destruction of the formed sealing layer, which also affects the effect of pressure-bearing plugging

Method used

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  • Well drilling high strength pressure-bearing plugging agent and application thereof
  • Well drilling high strength pressure-bearing plugging agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Weigh 13.8 parts of standard sampling sieve 14-20 mesh PPS plastic granules, standard sampling sieve 40-80 mesh PPS plastic particles 9.2 parts, standard sampling sieve 40-80 mesh expanded graphite particles 30 parts, standard sampling sieve 120- 45 parts of 325-mesh calcium carbonate powder and 3 parts of polypropylene fiber with a length of 3 mm were placed in a mixing device and stirred evenly to obtain the high-strength pressure-bearing plugging agent.

Embodiment 2

[0052] Weigh 15.6 parts of standard sampling sieve 14-20 mesh PPS plastic granules, standard sampling sieve 40-80 mesh PPS plastic particles 10.4 parts, standard sampling sieve 40-80 mesh expanded graphite particles 24 parts, standard sampling sieve 120- 45 parts of 325-mesh quartz sand powder and 3 parts of sepiolite fiber with a length of 5 mm were placed in a mixing device and stirred evenly to obtain the high-strength pressure-bearing plugging agent.

Embodiment 3

[0054] Weigh 16.8 parts of glass fiber reinforced PPS plastic particles of standard sampling sieve 14-20 mesh, 11.2 parts of glass fiber reinforced PPS plastic particles of standard sampling sieve 40-80 mesh, 26 parts of natural graphite particles of standard sampling sieve 40-80 mesh, Put 45 parts of bluestone powder with 120-325 mesh of standard sampling sieve and 6 parts of polypropylene fiber with a length of 3 mm, place them in a mixing device and mix them evenly to obtain the high-strength pressure-bearing plugging agent.

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Abstract

The invention provides a well drilling high strength pressure-bearing plugging agent and an application thereof, the plugging agent including: 20-30 parts of PPS plastic granular material, 15-30 partsof a graphite type granular material, 35-45 parts of a granular filling material, and 3-10 parts of a fiber material, the mass parts of the components adding to 100 in total. The graphite type granular material is selected from one or more of natural graphite granules and expanded graphite granules, the size being 40-80 meshes under standard screening sieve. The granular filling material mainly includes CaCO3 or silicate. The pressure-bearing plugging agent has high strength in main material, and is not liable to break under the complex stress status in a well; by means of the graphite type granular material, the granular filling material and the fiber material, a stable and solid blocking layer can be formed; in addition, the pressure-bearing plugging agent is high in temperature resistance, so that failure due to deterioration of the materials at high temperature is avoided. The pressure-bearing plugging agent can satisfy the demand of improving pressure-bearing capability of a stratum in deep well drilling.

Description

technical field [0001] The invention belongs to the technical field of oil drilling engineering plugging, in particular to a high-strength pressure-bearing plugging agent for drilling and its application. Background technique [0002] With the rapid development of economy and society, the demand for energy continues to increase. With the continuous development of oil and gas resources in shallow formations, the recovery rate continues to increase, and the remaining oil content gradually decreases. The exploration of new oil and gas resources turns to the development of deeper formations. In recent years, some large oil and gas fields discovered in China and oil and gas fields in Central Asia in cooperation with foreign countries, these oil and gas resources are all located in deep layers. In oil and gas exploration and development, the formations encountered are becoming more and more complex, the expansion of shale formations, the collapse and loss caused by collapse neckin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/08
Inventor 赵正国王中华郭建华田军刘文堂李旭东
Owner 中石化石油工程技术服务有限公司
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