Temporary plugging agent, preparation method thereof, and high-temperature reservoir temporary plugging diversion fracturing method

Abstract

The invention discloses a temporary plugging agent, a preparation method thereof and a high-temperature reservoir temporary plugging diversion fracturing method. The temporary plugging agent comprisesthe following components in percentage by mass: 5% of acrylamide, 1% of a composite cross-linking agent, 1% of hectorite, 0.1% of ammonium persulfate and 92.9% of water. The temporary plugging agentis prepared from acrylamide, the composite cross-linking agent, hectorite, ammonium persulfate and water, is suitable for temporary plugging and steering fracturing of high-temperature reservoirs of oil wells, has excellent plugging performance at high temperature, can resist high temperature of 160 DEG C, is appropriate in degradation rate, can guarantee enough construction time, can achieve 100%degradation rate, and avoids the problems of pollution to the reservoirs and the like.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration, in particular to the technical field of temporary plugging and fracturing of oil well reservoirs, in particular to a temporary plugging agent and a preparation method thereof, and a method for temporary plugging and diverting fracturing of high temperature reservoirs. Background technique [0002] With the deepening of oil and gas exploration and development, the hard-to-produce reserves continue to increase. At present, the main object of my country's oil and gas field development is gradually changing to deep and unconventional oil and gas reservoirs. The stimulation of low-porosity and low-permeability sandstone reservoirs, the stimulation of heterogeneous carbonate reservoirs, and the stimulation of deep oil and gas reservoirs have become the main contents of the work. For example, the Ordovician carbonate reservoir in Shunbei Oilfield of China has a depth of more than 5000m, ...

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Problems solved by technology

At present, the main problem of fiber temporary plugging is the limited pressure bearing capacity, while the composite steering material has higher sealing efficiency and pressure bearing capacity for cracks, and the fiber is easy to plug, but it is not easy to be transported over a long distance due to the limitation of winding, which makes it easy to There are few experimental studies on temporary plugging and fracturing of pure particles in fractures near the wellbore, especially for temporary plugging materials under high temperature conditions, and the optimization design of the process plan for particle temporary plugging is not comprehensive and in-depth

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