Elastic anti-channeling cement slurry and preparation method thereof

A cement slurry and anti-channeling technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of poor cementation of the cementing interface, high brittleness of cement stone, failure to meet the requirements of perforation and large-scale fracturing, etc. problems, to achieve the effect of improving the quality of cementation, high tensile strength, and avoiding oil, gas and water channeling

Inactive Publication Date: 2016-01-13
CNPC XIBU DRILLING ENG
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  • Abstract
  • Description
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Problems solved by technology

[0004] The present invention provides an elastic anti-channeling cement slurry and its preparation method, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem of existing cement slurry in oil. Oil, gas, and water are prone to channeling during cementing in active formations with water, gas, and water, causing poor bonding between the cementing interface and high brittleness of cement stone, which cannot meet the requirements of perforation and large-scale fracturing production.

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  • Elastic anti-channeling cement slurry and preparation method thereof

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Embodiment 1

[0018] Embodiment 1, the elastic anti-channeling cement slurry raw material contains 100 parts by weight of cement, 15 to 40 parts of elastic material, 40 to 65 parts of coarse silica sand, 20 to 30 parts of silicon powder, and 5 to 10 parts of fine silica sand. 3 to 6 parts of expansion agent, 17.7 to 40.5 parts of additives, 30 to 45 parts of water. The liquid-cement ratio in the elastic anti-channeling cement slurry obtained by the invention is 45% to 75%, and the liquid-cement ratio is the percentage of additive and mixing water in the cement mass.

Embodiment 2

[0019] Embodiment 2, the elastic anti-channeling cement slurry raw material contains 100 parts by weight of cement, 15 parts or 40 parts of elastic material, 40 parts or 65 parts of coarse silica sand, 20 parts or 30 parts of silicon powder, and 5 parts or 10 parts of fine silica sand. 3 or 6 parts of expansion agent, 17.7 or 40.5 parts of additives, 30 or 45 parts of water.

Embodiment 3

[0020] Example 3, the elastic anti-channeling cement slurry is obtained according to the following preparation method: the required amount of cement, elastic material, coarse silica sand, silicon powder, fine silica sand, additives and water are uniformly mixed to obtain the elastic anti-channeling cement slurry. In the present invention, by adding latex elastic material, expansion agent and silica sand and silica powder of different particle sizes, reasonable particle gradation is achieved by using close packing theory; close packing improves cement density, corrosion resistance, perforation impact resistance and Reduce the permeability; the expansion agent causes the volume expansion of the cement to produce chemical prestress, enhances the cementation force between the annulus and the casing and the formation, and effectively closes the micro-annulus; works together with the latex to achieve better anti-channeling ability, and at the same time improves the cementing second ...

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Abstract

The invention relates to the technical field of cement slurry for well cementation, and discloses an elastic anti-channeling cement slurry and a preparation method thereof. The elastic anti-channeling cement slurry is composed of the following raw materials: cement, elastic materials, coarse silicon sand, silicon powder, fine silicon sand, an expanding agent, additives, and water. The provided elastic anti-channeling cement slurry has the advantages of stable property, low water loss, and strong anti-gas-channeling and anti-water-invasion performances, is capable of effectively inhibiting the high pressure oil gas layer and active water layer so as to prevent gas and water channeling in reservoir, and solves the technical problem that the well cementation is very difficult in the reservoir where the water and gas channeling is severe. At the same time, the obtained elastic anti-channeling cement slurry also has the advantages of low Young modulus, high tensile strength, large cementing strength, and slightly expanded volume, is capable of improving the quality of cementing on the cement-formation interface, meets the requirements of multiple large-scale fracturing exploitations, and obtains high output of oil and gas flow in the reservoir, where oil, gas, and water are active.

Description

Technical field [0001] The invention involves the field of cement slurry technology in solid wells is an elastic anti -tanning cement slurry and its preparation method. Background technique [0002] Oil, gas, and water are one of the major problems facing the well -solid well. If the septum is not well closed, the high -pressure layer fluids enter the low pressure layer, causing the loss and waste of oil and gas resources. At the same timePoor tunnel has a huge threat to production capacity and environmental protection.Due to the brittleness of cement stones, during the trial operation of subsequent shot holes and large fracture of oil and gas wells, cement stones have ruptured and caused by micro -cracks.Connection with the oil layer seriously affects the mining effect.Therefore, cement slurry has good anti -channeling ability, cement stones have elasticity (resistance to stress deformation), and micro -expansion performance has become an important measure to solve this solid we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/493
CPCC09K8/493C04B28/00C04B2111/00724C09K8/426C04B14/06C04B20/0076C04B2103/0045C04B2103/0068C04B2103/22C04B2103/50
Inventor 齐静张伟王云周亚军高君罗立新
Owner CNPC XIBU DRILLING ENG
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