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Thermoelastic well cementation cement for thermal recovery of heavy oil

A technology for thermal recovery of heavy oil and well cementing, which is applied in the direction of drilling compositions, chemical instruments and methods, etc. It can solve the problems of poor toughness, tensile strength and integrity of cement stone, few supporting admixtures, and high cost. problems, to achieve the effect of improving crystal structure, reducing maintenance costs, and improving toughness and mechanical properties

Inactive Publication Date: 2020-01-31
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The above-mentioned existing technologies are all based on aluminate cement to prepare cementing cement with high temperature resistance. However, this type of cement has high cost, few supporting admixtures, and poor toughness, tensile strength and integrity of cement stone. Strong, will be limited in practical application

Method used

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  • Thermoelastic well cementation cement for thermal recovery of heavy oil
  • Thermoelastic well cementation cement for thermal recovery of heavy oil
  • Thermoelastic well cementation cement for thermal recovery of heavy oil

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Embodiment 1

[0029] As a preferred embodiment of the present invention, with reference to the attached figure 1 , figure 2 , image 3 and Figure 4 , this embodiment discloses: a thermoelastic heavy oil thermal recovery cement, which belongs to the technical field of oil and gas field cementing cement. The thermoelastic heavy oil thermal recovery cement of the present invention, the components include the following components and the corresponding proportions are as follows: cement: 50-75%; siliceous material: 20-40%; fiber: 0.2-2 %; latex: 0.5-10%; thermally reversible cross-linking reaction polymer: 1-8%; the cement is one of portland cement grade A, grade G, grade D oil well cement.

[0030] The raw material composition of each component weight percentage of external admixture in the present embodiment is as follows:

[0031]

[0032] Prepare 10kg of samples according to the proportions in the above table, the water-cement ratio is 0.44, the amount of water added is the water co...

Embodiment 2

[0037] according to Figure 5 The schematic diagram of the cross-sectional structure of the cement sheath integrity detection device is shown, and the cement slurry is prepared respectively by using the schemes M1, M2, M3, M4, M5, and M6, and poured into Figure 5 Molded in the cement ring mold in the medium, after curing at 60°C for 7 days, put it into a high-temperature curing kettle, cure at 350°C for 3 days, then cool to room temperature, raise the temperature to 350°C for 3 days, and cycle the temperature up and down for 3 times. After taking out the cement sheath, the cement sheaths formed by samples M1, M2, M3, M4, and M5 all maintained integrity, and the cement sheath was well combined with the ring mold. The cement sheath formed by sample M6 fell off from the ring mold, and the cement stone cracked.

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Abstract

The invention discloses thermoelastic well cementation cement for thermal recovery of heavy oil, belonging to the technical field of well cementation cement for oil and gas fields. The thermoelastic well cementation cement comprises the following components in percentage by weight: 50-75% of cement, 20-40% of a siliceous material; 0.2 to 2% of fibers, 0.5 to 10% of latex and 1-8% of a thermally reversible cross-linking reaction polymer, wherein the cement is one selected from the group consisting of Portland cement A-grade oil well cement, Portland cement G-grade oil well cement and Portland cement D-grade oil well cement. According to the invention, the fibers, the latex and the thermally reversible cross-linked polymer are added under a steam thermal recovery condition, so the mechanicalproperties of a well cementation cement sheath in a thermal stress environment are improved; meanwhile, a gap between the cement sheath and a casing pipe is filled through a low-temperature polymerization reaction of the thermally reversible cross-linked polymer after shaft cooling, so the purpose of improving the integrity of the cement sheath in a high-temperature complex mechanical environmentis achieved.

Description

technical field [0001] The invention relates to an oil and gas field cementing cement, in particular to a thermoelastic heavy oil thermal recovery cement and belongs to the technical field of oil and gas well cementing materials. Background technique [0002] my country is rich in heavy oil resources, and the proven and controlled reserves have reached 16×10 8 t, is the fourth largest producer of heavy oil in the world after the United States, Canada and Venezuela. The focus is on oil fields such as Shengli, Liaohe, Henan and Xinjiang. However, due to the high viscosity and density of heavy oil, the flow resistance in the formation is large, and the production efficiency of conventional production methods is low. In order to improve the recovery factor, a series of special technologies have been adopted in the recovery of heavy oil. So far, heavy oil thermal recovery technology with steam huff and puff and steam flooding as the main production methods has been formed, as w...

Claims

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Application Information

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IPC IPC(8): C04B28/04C09K8/42C09K8/467C04B111/20C04B111/28
CPCC04B28/04C04B2111/00724C04B2111/20C04B2111/28C04B2201/50C09K8/422C09K8/467C09K2208/08C04B14/06C04B24/26C04B24/281C04B14/46C04B24/287C04B24/282
Inventor 古安林曾雪玲张洋勇张凌志
Owner JIAHUA SPECIAL CEMENT