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Permeable cement slurry used for reconstruction of steam stimulation converted steam flooding oil reservoir

A technology of steam flooding and cement slurry, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of less oil and gas reservoir isolation and reconstruction, and achieve the effect of improving the comprehensive exploitation rate.

Active Publication Date: 2017-03-08
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are few reports on the use of high-temperature-resistant permeable cement slurry for isolation and reconstruction of oil and gas reservoirs.

Method used

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  • Permeable cement slurry used for reconstruction of steam stimulation converted steam flooding oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 210g fine cement, 90g aluminate cement, 120g high temperature strength stabilizer, 3.6g dispersant SXY, 4.5g fluid loss reducer SZ1-2, 15.9g penetration enhancer MAPT-1 and mix well, weigh 226.8g Add tap water to the corrugated mixing tank, add the uniformly mixed dry powder into the corrugated tank, stir at high speed for 45s, stir at low speed for 15s, and then thicken at 80°C for 20 minutes to prepare a steam huff and puff steam huff and puff to steam flooding layer transformation. Grout.

Embodiment 2

[0023] Grout recipe:

[0024] 210g fine cement + 90g aluminate cement + 120g high-temperature strength stabilizer + 3.6gSXY + 14.5gSZ1-2 + 15.9gMAPT-1, the water-solid ratio is 0.54, and the high-temperature strength stabilizer is silica sand with an average particle size of 48μm (300 mesh) .

[0025] The cement slurry was prepared according to the above formula and injection molded, and cured in water baths at 60°C, 280°C, and 320°C for 72 hours, and the compressive strength and oil phase permeability of cement stones reaching the curing age were measured. The test method for compressive strength of cement stone is in accordance with GB / T 19139-2003 "Oil Well Cement Experimental Method", and the test method for cement stone permeability is in accordance with SY / T5336-1996 "Routine Analysis Method for Rock Core". The test results are shown in Table 1.

[0026] Table 1 cement stone test results

[0027]

[0028] It can be seen from the data in the above table that after cu...

Embodiment 3

[0030] Grout recipe:

[0031] 210g fine cement + 90g aluminate cement + 120g high-temperature strength stabilizer + 3.6gSXY + 14.5gSZ1-2 + 15.9gMAPT-1, the water-solid ratio is 0.54, and the high-temperature strength stabilizer is silica sand with an average particle size of 48μm (300 mesh) .

[0032] The cement slurry was prepared according to the above formula, and the permeable cement slurry system was injected into the core with a flow rate of 1mL / min. After that, the core injected with cement slurry was taken out, placed in a constant temperature water bath system at 80°C for 1 day, and then transferred to 280°C under high temperature and high pressure. After 2 days of curing in the kettle, take it out and put it in the core holder, and conduct the plugging effect experiment of cement stone. The test results are shown in Table 2.

[0033] Table 2 Permeable cement plugging data of single core

[0034]

[0035] It can be seen from the above table that after the permeab...

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Abstract

The invention discloses a permeable cement slurry used for reconstruction of a steam stimulation converted steam flooding oil reservoir, belonging to a cement slurry formula used for well cementing of an oil and gas field. The permeable cement slurry mainly solves the problems of reconstruction of a damaged oil reservoir caused by multi-cycle high-temperature steam stimulation before heavy-oil heating recovery is converted into steam flooding. The permeable cement slurry used for reconstruction of the steam stimulation converted steam flooding oil reservoir is composed of the following components in percentages by mass: 47.10% of fine cement, 20.20% of aluminate cement, 26.94% of a high-temperature strength stabilizing agent, 3.50 to 4.50% of a permeation-increasing agent, 0.80 to 1.40% of a dispersant and 1.00 to 1.50% of a fluid loss agent, with the balance being a retarder, wherein the high-temperature strength stabilizing agent is silica sand with a particle size of 300 meshes; the permeation-increasing agent is MAPT-1; the dispersant is SXY; the fluid loss agent is SWJ-4; and the retarder is HP-2. The permeable cement slurry provided by the invention has good reservoir injection easiness and reservoir plugging effect; the curing sealing reservoir has high strength, cementing sand fixation, and temperature and salt tolerance; porous and communicated oil and gas transportation channels are formed under the action of high-temperature crude oil seepage; and the permeable cement slurry has high selective permeability to an oil phase, facilitates to maintaining normal production of a reconstructed oil reservoir, can be used for solving problems like steam channeling, water production and sand production in reconstruction of the steam stimulation converted steam flooding oil reservoir, and improves the overall quality of well cementing of the oil and gas field.

Description

technical field [0001] The invention relates to a cement slurry for well cementing in an oil and gas field, mainly a high-temperature permeability-resistant cement slurry capable of repairing and transforming damaged oil layers subjected to multiple rounds of high-temperature steam huff and puff operations. Background technique [0002] Thermal oil recovery is an effective means to increase the production of heavy oil. At present, my country's heavy oil recovery mainly includes three commercial thermal oil recovery technologies: steam huff and puff, steam flooding and oil layer combustion. Among them, the steam huff and puff technology has become the main method for commercial heavy oil production due to its advantages of simple construction, quick results, and direct implementation in production wells. However, according to on-site feedback information, after multiple rounds of steam huff and puff, the rock framework and oil and gas production layers in the steam-swept zone...

Claims

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Application Information

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IPC IPC(8): C09K8/467C04B28/06
CPCC04B28/06C04B2201/50C09K8/467C04B7/02C04B14/06C04B24/36C04B2103/0068C04B2103/408C04B2103/22
Inventor 彭志刚张健张瑞郑勇王吉星霍锦华陈大钧
Owner SOUTHWEST PETROLEUM UNIV
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