Ultra-high temperature elasticity and toughness agent for oil and gas well cementing and composition and application thereof
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A well cementing and ultra-high temperature technology is used in the field of oil and gas well cementing and cement toughening agent for oil and gas well cementing. Insufficient thermal performance and other problems, to achieve the effect of improving brittleness, convenient preparation and low cost
Active Publication Date: 2019-09-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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But the performance of the cement slurry prepared by this invention under high temperature conditions remains to be studied
[0005] Chinese patent document CN107699216A discloses a kind of tough cement slurry for gas storage wells, which solves the problem that the existing rubber particle toughened cement slurry is not resistant to high temperature
[0008] Aiming at the insufficient temperature resistance of the elastic-toughness agent used in oil and gas well cementing cement at present, which cannot meet the high temperature and ultra-high temperature cementing requirements faced by deep wells / ultra-deep wells, the present invention provides an ultra-high temperature elastic-toughness agent for oil and gas well cementing. The agent and its composition can prevent brittle failure of cement stone under high pressure and high stress, ensure the structural integrity of cement stone ring, and improve the quality of high temperature and high pressure cementing in ultra-deep wells
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Embodiment 1
[0043] Example 1: Taking G-grade oil well cement with 40% sand as an example, optimizing the formula of high-temperature elastic-toughening agent
Embodiment 2
[0062] An ultra-high temperature elastic-ductile well cementing cement slurry, comprising the following components by mass:
[0064] The preparation method comprises the following steps:
[0065] Mix oil well G-grade cement, silica sand, polytetrafluoroethylene rubber powder, basalt fiber, and nano-alumina fiber evenly, then add water and stir evenly to obtain ultra-high temperature elastic and tough cementing cement slurry.
[0066] The ultra-high temperature elastic-ductile cementing cement slurry prepared in this example is cured for 5 days under the condition of 265°C / 35MPa, and the test results of triaxial mechanical properties are shown in the figure figure 2 . After the compressive strength test, the cement stone looks like Figure 4 . Compared with the cement stone added with silica san...
Embodiment 3
[0068] An ultra-high temperature elastic-ductile well cementing cement slurry, comprising the following components by mass:
[0069] Oil well G grade cement 100 parts, silica sand 35 parts, polytetrafluoroethylene rubber powder 5 parts, basalt fiber 0.3 part, nano alumina fiber 0.5 part, water 54 parts;
[0070] The preparation method is the same as in Example 2.
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Abstract
The invention relates to an ultra-high temperature elasticity and toughness agent for oil and gas well cementing and a composition thereof. The ultra-high temperature elasticity and toughness agent comprises the following components which are mixed in a weight ratio: 60%-90% of polytetrafluoroethylene rubber powder, 5%-20% of basalt fibers, and 5%-20% of nano aluminum oxide fibers. The use temperature of the ultra-high temperature elasticity and toughness agent of the invention can reach 265 DEG C. When the addition amount of the agent is 2.5%-5% of the dry powder weight of oil well cement, the ultra-high temperature elasticity and toughness agent can significantly reduce the elastic modulus of cement stone, enhance the compressive strength of the cement stone and significantly improve the impact resistance of the cement stone, which effectively solves the problems of obvious hard brittleness, poor strain resistance, easy damage of the cement stone and the like of the cement stone for ultra-high temperature oil and gas well cementing and is beneficial to the insurance of the integrity of a wellbore of an ultra-high temperature oil and gas well.
Description
technical field [0001] The invention relates to the technical field of oil and gas well cementing cement toughening agents, in particular to an ultra-high temperature elastic and toughening agent for oil and gas well cementing, and belongs to the technical field of oil and gas well cementing. Background technique [0002] With the rapid development of China's economy, the contradiction between oil supply and demand is becoming more and more serious. In addition to actively exploring foreign oil resource markets, accelerating the exploration and development of oil and gas resources in deep formations is an important measure to solve the problem. With the further development of exploration and development, the structure of underground strata and the temperature and pressure continue to increase, posing a great challenge to the quality of cementing and the integrity of the wellbore in the later stage. [0003] The commonly used oil well cement at present is a kind of Portland c...
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