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Low-temperature high-strength oil-gas well plugging agent

A technology for oil and gas wells and plugging agents, applied in the field of oil and gas well sealing and plugging agents, low-temperature high-strength oil and gas well plugging agents, can solve the problems of slow development of low-temperature strength and weak impact resistance that cannot meet the construction requirements of channeling and plugging and other problems, to achieve the effect of excellent water impact resistance, rapid increase in strength, and increase in strength

Inactive Publication Date: 2020-07-03
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects and deficiencies in the above-mentioned prior art, the present invention provides a low-temperature high-strength oil and gas well plugging agent. When the well is low in water plugging, the impact resistance is weak and cannot meet the construction requirements for channeling and leakage plugging, resulting in low plugging efficiency and even huge losses

Method used

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  • Low-temperature high-strength oil-gas well plugging agent
  • Low-temperature high-strength oil-gas well plugging agent
  • Low-temperature high-strength oil-gas well plugging agent

Examples

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Embodiment 1

[0026] As a preferred embodiment of the present invention, with reference to the attached figure 1 , this example discloses:

[0027] A low-temperature high-strength oil well plugging agent, including the following raw materials in terms of mass percentage: 80% sulfoaluminate cement, 0.1% basalt fiber, 0.1% hydroxypropyl methylcellulose ether, 0.1% polyacrylamide, calcium carbonate 18%, bentonite 1.6%, boric acid 0.05%, D-sodium gluconate 0.05%; the specific surface area of ​​the described sulfoaluminate cement is 350cm 2 / g-450cm 2 / g; the fiber length of basalt fiber is less than 12cm; the specific surface area of ​​calcium carbonate powder is greater than 800cm 2 / g.

Embodiment 2

[0029] As another preferred embodiment of the present invention, with reference to the attached figure 1 , this example discloses:

[0030] A low-temperature high-strength oil well plugging agent, including the following raw materials in terms of mass percentage: 70% of sulfoaluminate cement, 0.2% of hydroxypropyl methylcellulose ether, 0.1% of polyacrylamide, 20% of calcium carbonate, and 9.65% of bentonite %, boric acid 0.02%, D-sodium gluconate 0.03%; the specific surface area of ​​the described sulphoaluminate cement is 350cm 2 / g-450cm 2 / g; the fiber length of basalt fiber is less than 12cm; the specific surface area of ​​calcium carbonate powder is greater than 800cm 2 / g.

Embodiment 3

[0032]As another preferred embodiment of the present invention, with reference to the attached figure 1 , this example discloses:

[0033] A low-temperature high-strength oil well plugging agent, including the following raw materials in terms of mass percentage: 90% sulfoaluminate cement, 0.3% basalt fiber, 0.25% hydroxypropyl methylcellulose ether, 4.33% calcium carbonate, and 5% bentonite , boric acid 0.02%, D-sodium gluconate 0.1%; the specific surface area of ​​the described sulfoaluminate cement is 350cm 2 / g-450cm 2 / g; the fiber length of basalt fiber is less than 12cm; the specific surface area of ​​calcium carbonate powder is greater than 800cm 2 / g.

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Abstract

The invention discloses a low-temperature high-strength oil-gas well plugging agent, and relates to the technical field of petroleum drilling materials. The low-temperature high-strength oil-gas wellplugging agent is prepared from the following raw materials in percentage by mass: 70 to 90 percent of an inorganic gel material, 0 to 0.5 percent of a fiber toughening agent, 1 to 20 percent of a filling material, 1 to 5 percent of an expanding agent, 0.1 to 0.3 percent of a flocculating agent and 0.05 to 0.2 percent of a retarder, wherein the inorganic gel material is sulphoaluminate cement, thefiber length of the fiber toughening agent is less than 12cm, the filling material is calcium carbonate powder and the retarder is a composition of boric acid and D-sodium gluconate. The sulphoaluminate clinker, the active admixture, the water-soluble organic material and other raw materials are adopted, so that the plugging agent has the characteristics of high hour strength development speed, high underwater impact resistance, high acid solubility and good thixotropic property at 10-60 DEG C under a specific ratio, and the plugging purpose is achieved by utilizing the characteristics of theplugging agent.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling materials, in particular to an oil-gas well sealing and plugging agent, more specifically to a low-temperature high-strength oil-gas well sealing agent. Background technique [0002] With the development of gas fields, formation pressure drops at a rate of 8% per year, and the forms of lost circulation and "leakage to blowout" are becoming more and more severe. The causes of lost circulation are mainly related to the geological structure and rock formation conditions in the mining area. The mining area is dominated by planted topsoil, gravel layers, and quicksand layers. The depth of surface water is relatively shallow, and the formation pressure is also relatively sensitive. Once the concentration of drilling fluid used in the drilling process is not suitable, accidents will occur. Low concentration will cause water discharge. , If the concentration is high, leakage will occur. [00...

Claims

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Application Information

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IPC IPC(8): C09K8/46C04B28/06
CPCC09K8/426C09K8/46C04B28/06C09K2208/08C04B2111/00724C04B2201/50C04B2201/20C04B14/46C04B14/386C04B14/28C04B14/08C04B14/104C04B24/2652C04B24/383C04B24/10C04B22/0013
Inventor 曾雪玲张洋勇古安林
Owner JIAHUA SPECIAL CEMENT
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