DEFLECTING SYSTEMS FOR USE IN WELL TREATMENT OPERATIONS Russian patent published in 2019 - IPC E21B43/267 E21B43/22 C09K8/506 C09K8/88 C09K8/92 

FIELD: medicine.

SUBSTANCE: invention relates to the use of clogging agents and mixtures containing them for intensifying the production of hydrocarbons from subterranean formations. Method for intensifying hydrocarbon production from a subterranean formation through which a wellbore passes, including the steps of pouring a mixture containing a soluble blocking agent and a proppant into a highly permeable fracture zone inside the subterranean formation near the wellbore, wedging at least part of the open high-permeable zone with the proppant mixture and blocking at least part of the high-permeable zone with a plugging agent, pumping the fluid into the underground reservoir and in the area of the reservoir with a lower permeability, located farther from the wellbore, dissolving the plugging agent, blocking at least part of the high-permeability zone near the wellbore, and obtaining hydrocarbons from the high permeability and lower permeability zones. Method for increasing fluid output from a well passing through a subterranean formation, comprising the steps of pumping the first fluid into the subterranean formation under a pressure sufficient to create or increase a fracture near the wellbore, where the first fluid contains a mixture of blocking agent and proppant, the blocking agent is soluble in the conditions of fluid extraction from the well, pouring the first fluid into the highly permeable fracture zone, wedging at least part of the high-permeable zone with the proppant mixture and blocking at least part of the high-permeable zone with a plugging agent, pumping the second fluid into the underground reservoir and in the area of the reservoir with a lower permeability, located farther from the wellbore, dissolving the plugging agent, blocking at least part of the high-permeability zone near the wellbore, in the reservoir conditions and extracting fluid from the high-permeability zone and the lower permeability zone. Method of intensifying the flow from a subterranean formation through which the wellbore passes, comprising the stages of perforating the casing string inside the wellbore to create a channel near the wellbore, which passes from the casing into the subterranean formation, is pumped into the subterranean formation under pressure sufficient to create or increase a fracture near the wellbore, a fluid containing a mixture of a capping agent and a proppant, where the clogging agent is soluble under formation conditions, pouring the mixture into the high-permeable zone in the fracture near the wellbore and blocking at least a portion of the high-permeable zone with the closure agent, the granulometric composition thereof is sufficient to at least partially block the penetration of the second fluid into the highly permeable zone of the formation, pumping the second fluid into the underground formation and in the zone of a lower permeability reservoir located farther from the wellbore, dissolving the plugging agent near the wellbore under the reservoir conditions and extracting fluid from the high-permeable zone containing proppant from said mixture. Method for increasing fluid recoil from a zone near a wellbore passing through a subterranean formation, comprising the steps of pumping a first fluid containing a mixture of a capping agent and a proppant into a highly permeable fracture zone near the wellbore, where the closure agent is soluble under reservoir conditions, pouring the first fluid mixture into the highly permeable zone, wedging at least part of the high permeability zone with the proppant of the first mixture and blocking at least part of the high permeable zone with a capping agent, injecting fluid containing the capping agent into the subterranean formation and into the zone of the lower permeability formation located farther from the wellbore, pumping the proppant-loaded fluid into the subterranean formation and into the lower permeability formation zone, the last specified steps are not necessarily repeated, dissolving the blocking agent, blocking at least a part of the high-permeability zone near the wellbore, and extracting fluid from the high permeability zone and the lower permeability zone. Method for intensifying inflow from a subterranean formation through which a reservoir passes, including the stages of introducing a fluid into the reservoir containing a mixture of the following components: at least one aliphatic polyester having the general formula of the above repeating units, and (ii) at least one compound of the above formula or its anhydride, the fluid having a particle size suitable for blocking the penetration of fluid into the high-permeability zone of the formation, and diverting the flow of fluid into the low-permeability portion of the formation. Method for reducing fluid leakage into a subterranean formation through which a wellbore passes, comprising the steps of injecting fluid into a wellbore containing a mixture of components: (i) at least one aliphatic polyester having the above formula, and (ii) at least one compound of the above formula or its anhydride, and a filter cake is formed from said compound on the wall of the subterranean formation or on the surface of the borehole. Method for controlling sand for a wellbore passing through a subterranean formation, comprising the steps of injecting a suspension into the wellbore containing particles of the following compounds: (i) at least one aliphatic polyester having the above formula, and (ii) at least one compound of the above formula or its anhydride, and placing at least a portion of the solid particles adjacent to the subterranean formation to form a fluid permeable packing that is able to reduce or largely prevent the passage of formation particles from the subterranean formation to the wellbore, allowing the formation fluids to pass from the subterranean formation into the wellbore. Invention is developed in subclaims.

EFFECT: technical result is the expansion of the possibilities of extracting hydrocarbons from highly permeable zones in the system of cracks.

47 cl, 7 tbl, 7 ex, 3 dwg