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.

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

The embodiment of the invention provides a construction method and device based on temporary plugging of a reservoir. The method comprises the steps of determining the dosage of an initial temporary plugging agent on the basis of perforation shot hole information of a target reservoir so as to prepare the initial temporary plugging agent; injecting the initial temporary plugging agent into the target reservoir, and detecting a pressure increasing value of the target reservoir, wherein the pressure increasing value comprises the pressure difference of the reservoir after the initial temporary plugging agent is injected and before the initial temporary plugging agent is injected; calculating the shot hole erosion diameter by utilizing pump injection historical information of a perforation shot hole in the condition that the pressure increasing value is smaller than a pressure increasing threshold value; obtaining the dosage of a secondary temporary plugging agent according to the shot hole erosion diameter so as to prepare the secondary temporary plugging agent; and injecting the secondary temporary plugging agent into the target reservoir so as to temporarily plug the perforation shot hole. According to the method, secondary temporary plugging is performed according to the pressure condition of the target reservoir, so that a good plugging effect can still be achieved in the condition that the perforation shot hole is eroded, and the exploitation quantity of oil and gas resources in the target reservoir is increased.

Construction method and device based on temporary plugging of reservoir

The invention discloses a compound temporary blocking steering fracturing method capable of improving the productivity of a sandstone reservoir gas well. The method comprises the following steps that1, according to the reservoir stress data, micro-crack development conditions and reservoir brittleness data of the sandstone reservoir gas well, a transformed sandstone reservoir gas well and a transformed sandstone reservoir both of which can be subjected to temporary blocking steering fracturing are selected; 2, according to geological data of the sandstone reservoir gas well and production dynamic data of an adjacent well, in combination with fracturing analysis software for simulation calculation, fracturing construction parameters are determined; 3, the dosage of a composite temporary blocking agent is calculated, wherein the composite temporary blocking agent is composed of a foam temporary blocking agent and a fiber temporary blocking agent, and the dosage of the fiber temporary blocking agent is 3%o of the mass fraction of the foam temporary blocking agent; 4, pump injection construction steps are set, and a fracturing construction pump sequence is designed; 5, a foam temporary blocking agent work liquid is prepared; 6, main fracturing construction is carried out, the composite temporary blocking agent is used for blocking original cracks of the sandstone reservoir gas well, the cracks are subjected to steering, and then construction at a steering fracturing stage is carried out.

Compound temporary blocking steering fracturing method capable of improving productivity of sandstone reservoir gas well

The invention discloses a water controlling fracturing and production increase method for a bottom water and gas layer of lithic sandstone. In a pre-liquid construction stage, water controlling fracturing fluid is used to reduce water phase permeability and reduce water lock damage during a fracturing process without changing gas phase permeability. A combined sinking agent is used for slug construction to form polishing perforating holes, and the combined sinking agent is sunk to form a lower artificial partition layer. The combined sinking agent can reduce the ability of formation water flowing into a wellbore through cracks, improve the seepage ability of a gas phase to make the gas rapidly flow and suppress the flow of the formation water (as shown in figure 1) to achieve the purpose of water controlling and gas production. In a sanding construction stage, small construction displacement is changed into construction displacement to reduce the height extension of the cracks, and sothe height of the cracks cannot extend to an aquifer section at the bottom parts of the cracks.

Water controlling fracturing and production increase method for bottom water and gas layer of lithic sandstone

The invention belongs to the technical field of petrochemical industry and particularly relates to a low-hydrocarbon anhydrous fracturing fluid apparatus and a fracturing method thereof. The low-hydrocarbon anhydrous fracturing fluid apparatus comprises an LPG (liquefied petroleum gas) storage tank, a liquid nitrogen tank, an additive tank, a proppant tank, a mixing tank, an LPG pump, a high pressure pump, a wellhead, a controller, a liquid discharge device and a flare tower. The problems of the prior art are solved that only 20-50% of fracture length contributes to the actual production by water-based fracturing and sand fracturing, great damage is caused to reservoirs, initial recovery ratio is low, certain well site area is required, the cost is high and operations are complex. The proppant settling problem of conventional water-based fracturing is avoided; fracture-high full propping helps more completely open a reservoir; fracture length is effectively extended; damage to the reservoirs is reduced; final recovery ratio is increased; small floor area is used; operations are simple; fracturing cost is greatly reduced.

Low-hydrocarbon anhydrous fracturing fluid apparatus and fracturing method thereof

The invention discloses a multistage dynamic temporary blocking volume acid fracturing method. According to the multistage dynamic temporary blocking volume acid fracturing method,"multistage physical temporary blocking" and "multistage chemical temporary blocking" are treated as principle thinking, and multistage hydraulic fracturing with sand and multistage injection acid fracturing are combined. According to pump injection sequence of front-loading linear glue with certain concentration to make seams, saturating a reservoir, improving flow conductivity of fractures by propping agents with the small grain size or composite grain size, and injecting degradable acid-resistant fiber temporary blocking fluid, through multistage with large displacement, the fracture physical steering transformation is achieved; and then through a multistage interval type with large displacement, different types of acid liquors "mutual solvent, gelled acid, steering acid..., mutual agent" are injected, and thus fracture chemical temporary blocking steering transformation is achieved. According to the multistage dynamic temporary blocking volume acid fracturing method,the pertinence and the flow conductivity of the reservoir are improved, the loss of the acid liquors are lowered, the etching length of the fractures are increased, the transforming volume of the reservoir is enlarged by fracture steering, and thus the target that the individual well producing rate is improved by effective transformation of the cloud-like carbonate rock reservoir is achieved.

Multistage dynamic temporary blocking volume acid fracturing method

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Compound temporary blocking steering fracturing method capable of improving productivity of sandstone reservoir gas well

Water controlling fracturing and production increase method for bottom water and gas layer of lithic sandstone

Low-hydrocarbon anhydrous fracturing fluid apparatus and fracturing method thereof

Multistage dynamic temporary blocking volume acid fracturing method