Temperature-responsive well cementation cement slurry and preparation method thereof

Abstract

The invention discloses temperature-responsive well cementation cement slurry which comprises the following components in percentage by mass: 63-67% of oil well cement, 3.3-9.4% of a bidirectional intelligent temperature control material, 27.3-29.4% of mixing water, 0.1% of a dispersing agent and 0.2% of a filtrate reducer, and the sum of the mass percentages of the components is 100%. The invention further discloses a preparation method of the well cementation cement slurry; wherein the temperature-responsive well cementation cement slurry is constructed by taking oil well cement as a base material and a bidirectional intelligent temperature control material as an auxiliary material and being supplemented with other additives. The bidirectional intelligent temperature control material has the characteristics of bidirectional and intelligent temperature control, and realizes reversible, timely and efficient control of the hydration temperature rise of the deepwater natural gas hydrate layer well cementation cement slurry. In the cement hydration acceleration period, the cement slurry hydration temperature rise is reduced through phase change heat absorption of the bidirectional intelligent temperature control material core material, thermal decomposition of metastable state hydrate is avoided, in the deceleration period, the cement slurry temperature reduction rate is reduced through phase change heat release, and therefore, low-temperature mechanical property development is promoted.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well cementing, and in particular relates to a temperature-responsive cementing cement slurry and a preparation method of the temperature-responsive cementing cement slurry. Background technique [0002] Today, the contradictions between global food, resource and energy supply shortages and rapid population growth are becoming more and more prominent. Exploitation and utilization of marine resources is an inevitable trend of resource exploration and development in countries all over the world. The global marine oil and gas reserves are huge. According to incomplete statistics, the global marine oil and gas reserves are 100-250 billion tons, accounting for about 34% of the total proven reserves. my country's offshore oil and gas resources are also very rich. There are four offshore oil and gas production areas in the Bohai Sea, the South Yellow Sea, the East China Sea and the South China Sea. H...

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Problems solved by technology

However, it is not difficult to find that the use of low-heat-of-hydration cementitious materials, inert materials, and heat-absorbing agents to adjust the hydration heat release and hydration temperature rise of the cement slurry system are reflected in irreversible inhibition, and the low temperature at the bottom of the well further delays the cement slurry. The mechanical properties of the slurry system are developed; in addition, the melted PCMs have caused great damage to the compressive strength and flexural strength of the cured cement stone, causing the cement stone to lose its original application value

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