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Preparation method of inorganic fiber toughening agent for oil and gas well cementing slurry

A technology of cementing cement slurry and inorganic fiber, which is applied in the field of oil and gas drilling and completion engineering, and can solve the problems of cement stone resistance to cyclic load performance, obvious thickening effect of magnesium carbonate whiskers, cement stone elastic modulus, etc. problem, to achieve low elastic modulus, good compressive and flexural strength, and enhanced bonding strength

Pending Publication Date: 2022-05-24
CHINA PETROCHEMICAL CORP +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The domestically authorized invention "toughening and anti-channeling agent for cement and toughening cement for shale gas horizontal well cementing (CN 104291733 B)" is compounded with styrene-butadiene rubber and latex powder at a mass ratio of 2:1 to reduce the elasticity of cement stone The modulus is 11.67GPa, and the flexural strength is increased to 1.98MPa without the use of fiber materials; the domestically authorized invention "a magnesium carbonate whisker toughening agent for reducing the brittleness of cement stone in oil and gas wells (CN 105368411 B)" Using magnesium carbonate whiskers as toughening materials greatly improves the flexural strength of cement stone, but the elastic modulus of cement stone is not paid attention to, and the six-speed rotational viscosity data of cement slurry shows the thickening of magnesium carbonate whiskers Obvious effect
The above-mentioned inventions solve the brittleness problem of cement stone to a certain extent, but none pay attention to the performance of cement stone against cyclic load

Method used

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  • Preparation method of inorganic fiber toughening agent for oil and gas well cementing slurry
  • Preparation method of inorganic fiber toughening agent for oil and gas well cementing slurry
  • Preparation method of inorganic fiber toughening agent for oil and gas well cementing slurry

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preparation example Construction

[0023] as Figure 1 The present invention provides a method for preparing an inorganic fiber toughener for cementing cementing cementitious cementitious in oil and gas wells, comprising the following steps:

[0024] (1) Single fiber "stirring-ultrasonic" pretreatment process

[0025] Basalt fibers, carbon fibers, magnesium fibers and silicon carbide fibers are placed in a high-speed stirrer containing deionized water, and the amount of corresponding fibers added to each high-speed stirrer is 5 to 15% of the mass of deionized water;

[0026] Under conditions greater than 10000 rpm, stir for 15-30 minutes;

[0027] The fibers in the deionized water were dispersed by ultrasonic waves for 30 minutes.

[0028] Filtration, washing, drying, standby;

[0029] (2) A variety of fibers "suspension - stirring" mixing process

[0030] One or more of the pretreated basalt fibers, carbon fibers, magnesium fibers, and silicon carbide fibers are added to deionized water in a preset proportion, and ...

Embodiment 1

[0040] The relevant process parameters for the preparation of inorganic fiber tougheners for cementing cementing cement slurry in oil and gas wells are as follows:

[0041] (1) Single fiber "stirring-ultrasonic" pretreatment process

[0042] Mass ratio of pretreated fibers to deionized water: 5%.

[0043] Pretreatment speed: 10,000 rpm.

[0044] Mixing time: 20 minutes.

[0045] Ultrasonic processing time: 30 minutes.

[0046] (2) A variety of fibers "suspension - stirring" mixing process

[0047] Basalt Fiber: Carbon Fiber: Magnesiite Fiber: Silicon Carbide Fiber Mass Ratio = 3:3:1:1.

[0048] Stirring speed: 3000 rpm.

[0049] Mixing time: 150 minutes.

[0050] (3) Mechanical roughening process of a variety of fiber surfaces

[0051] Grinding time: 5 minutes.

[0052] (4) Fiber surface modification process

[0053] Water bath temperature: 75 °C.

[0054] Nano silica solution concentration: 30% mass fraction.

[0055] Stirring speed: 2000 rpm.

[0056] Mixing time: 25 minutes.

[0...

Embodiment 2

[0068] The relevant process parameters for the preparation of inorganic fiber tougheners for cementing cementing cement slurry in oil and gas wells are as follows:

[0069] (1) Single fiber "stirring-ultrasonic" pretreatment process

[0070] Mass ratio of pretreated fibers to deionized water: 10%.

[0071] Pretreatment speed: 12000 rpm.

[0072] Mixing time: 25 minutes.

[0073] Ultrasonic processing time: 30 minutes.

[0074] (2) A variety of fibers "suspension - stirring" mixing process

[0075] Basalt Fiber: Carbon Fiber: Magnesiite Fiber: Silicon Carbide Fiber Mass Ratio = 2:4:1:1.

[0076] Stirring speed: 3000 rpm.

[0077] Mixing time: 180 minutes.

[0078] (3) Mechanical roughening process of a variety of fiber surfaces

[0079] Grinding time: 6 minutes.

[0080] (4) Fiber surface modification process

[0081] Water bath temperature: 75 °C.

[0082] Nano silica solution concentration: 35% mass fraction.

[0083] Stirring speed: 2200 rpm.

[0084] Mixing time: 30 minutes.

[0...

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Abstract

The invention provides a preparation method of an inorganic fiber toughening agent for oil and gas well cementing cement slurry, and relates to the technical field of unconventional oil and gas well drilling and completion, and the preparation method comprises the following steps: (1) single fiber stirring-ultrasonic pretreatment process; (2) a multi-fiber suspension-stirring mixing process; (3) performing a mechanical roughening process on various fiber surfaces; (4) a fiber surface modification process; (5) a spray drying process; the inorganic fiber toughening agent for the oil and gas well cementing cement slurry prepared by the invention can be well compatible with a cement slurry system, does not change the rheological property of the cement slurry, and can effectively reduce the brittleness of set cement, improve the mechanical flexibility of the set cement and enhance the cyclic load resistance of the set cement; and the cement sheath sealing integrity in the oil-gas well production period is met.

Description

Technical field [0001] The present invention belongs to the field of oil and gas drilling and completion engineering technology, specifically, relates to a method for preparing an inorganic fiber toughener for cementing cementing cement slurry in oil and gas wells. Background [0002] Nowadays, unconventional oil and gas resources have occupied an important position in the global energy structure. Horizontal well technology and large-scale segmental hydraulic fracturing technology have become key technologies for increasing shale gas production. However, when sectional hydraulic fracturing, the horizontal section of the cement ring will be subject to circulating loads caused by changes in temperature and pressure in the wellbore. Therefore, cement stone is required to have good elastic toughness and compressive strength, of which tougheners play a crucial role. The domestically authorized invention "Toughening Anti-channeling Agent for Cement and Toughened Cement for Cementing we...

Claims

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Application Information

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IPC IPC(8): C09K8/467
CPCC09K8/467Y02W30/91
Inventor 张国锋郝海洋刘俊君王建斌何吉标张家瑞卞江崔淼赵勇尚琼
Owner CHINA PETROCHEMICAL CORP
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