Permeable cement slurry for steam stimulation to steam flooding reservoir reconstruction

A technology of steam flooding and cement slurry, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of less isolation and transformation of oil and gas layers, and achieve the effect of improving the utilization rate of comprehensive recovery

Active Publication Date: 2021-03-02
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 for steam stimulation to steam flooding reservoir reconstruction
  • Permeable cement slurry for steam stimulation to steam flooding reservoir reconstruction

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 for steam huff and puff to steam flooding oil layer transformation, which belongs to a cement slurry formula for oil and gas field well cementing, and mainly solves oil layer damage caused by multiple rounds of high temperature steam huff and puff before heavy oil thermal recovery is converted to steam flooding retrofit problem. The permeable cement slurry for steam stimulation to steam flooding oil layer transformation is composed of fine cement, aluminate cement, high temperature strength inhibitor, permeability enhancer, dispersant, fluid loss reducer, and retarder, wherein the mass percentages are: 47.10% is fine cement, 20.20% is aluminate cement, 26.94% is high temperature strength stabilizer, 3.50-4.50% is permeation enhancer, 0.80-1.40% is dispersant, 1.00-1.50% is fluid loss reducer, and the rest is the retarder content. Wherein the high-temperature strength stabilizer is 300-mesh silica sand, the permeability enhancer MAPT-1, the dispersant is SXY, the fluid loss reducer is SWJ-4, and the retarder is HP-2. The invention has good reservoir injectability and oil layer plugging effect, and the solidified sealing layer has high strength, cementation and sand fixation and temperature and salt resistance, and forms a porous and connected oil and gas transportation channel under the seepage of high-temperature crude oil. It has high selective permeability to oil phase, which is conducive to maintaining the normal production of the oil layer after stimulation. It can be used to solve the problems of steam channeling, water production and sand production in the transformation of high temperature steam huff and puff to steam flooding oil layer and improve the overall cementing quality of oil and gas fields.

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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Patent Type & Authority Patents(China)
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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