US 2026/0028893 A1Published application

Method and Apparatus for Controlling Temporary Plugging Construction in Perforation Boreholes

AssigneesChina University of Petroleum-Beijing, STenergy LLC

InventorsBen Li, Quanjun Wang, Hui Li

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Abstract

The present application discloses a method and device for controlling perforation plugging operations. The method comprises: acquiring the pre-plugging fracturing fluid displacement and the target diversion pressure for a perforated interval; invoking a plugging ball quantity model to calculate the target number of plugging balls; computing the theoretical diversion pressure based on the post-plugging displacement and ball quantity; adjusting the post-plugging displacement when the theoretical pressure does not exceed the target pressure until it does; performing the plugging operation using the determined ball quantity and adjusted displacement; determining whether the plugging is effective by comparing the bottomhole pressure difference before and after the operation with the target diversion pressure. This method enables accurate determination of the number of plugging balls and fluid displacement after plugging, thereby ensuring that the fracturing operation meets the designed requirements.

Claims11

Dependent claims

A control method for temporary plugging construction in perforation boreholes, characterized in that the method comprises:

acquiring the pre-plugging fracturing fluid displacement, post-plugging fracturing fluid displacement, fracturing fluid density, apparent density of the proppant, sand ratio, and target diversion pressure of a target perforation interval;
invoking a pre-established model for determining the number of temporary plugging balls for perforation boreholes;
calculating the number of plugging balls, as the target number of plugging balls, based on the pre-plugging fracturing fluid displacement, post-plugging fracturing fluid displacement, fracturing fluid density, apparent proppant density, sand ratio, and the target diversion pressure, in combination with the plugging ball determination model;
calculating a theoretical diversion pressure based on the post-plugging fracturing fluid displacement and the target number of plugging balls;
determining whether the theoretical diversion pressure is greater than the target diversion pressure;
if not, adjusting the post-plugging fracturing fluid displacement until the calculated theoretical diversion pressure exceeds the target diversion pressure, and identifying the corresponding displacement as the target post-plugging fracturing fluid displacement;
performing the temporary plugging fracturing operation based on the determined target number of plugging balls and the target post-plugging fracturing fluid displacement;
acquiring a bottomhole pressure at a preset first time before the temporary plugging operation, and a bottomhole pressure at a second time after the temporary plugging operation;
determining whether the temporary plugging operation is effective by comparing the difference between the bottomhole pressure at the second time and that at the first time with the target diversion pressure.

6 more elements

A control apparatus for temporary plugging construction in perforation boreholes, characterized in that the apparatus comprises:

an acquisition module, configured to acquire the pre-plugging fracturing fluid displacement, post-plugging fracturing fluid displacement, fracturing fluid density, apparent density of the proppant, sand ratio, and target diversion pressure of a target perforation interval;
a retrieval module, configured to retrieve a pre-established model for determining the number of temporary plugging balls for perforation boreholes;
a first calculation module, configured to calculate the number of plugging balls, as the target number of plugging balls, based on the pre-plugging and post-plugging fracturing fluid displacements, fracturing fluid density, apparent proppant density, sand ratio, and target diversion pressure, as well as the plugging ball determination model;
a second calculation module, configured to calculate the theoretical diversion pressure based on the post-plugging fracturing fluid displacement and the target number of plugging balls;
an adjustment module, configured to determine whether the theoretical diversion pressure exceeds the target diversion pressure, and if not, to adjust the post-plugging fracturing fluid displacement until the calculated theoretical diversion pressure exceeds the target diversion pressure, and to set the corresponding post-plugging fracturing fluid displacement as the target post-plugging fracturing fluid displacement;
a construction module, configured to perform the temporary plugging fracturing operation based on the determined target number of plugging balls and the target post-plugging fracturing fluid displacement;
a third acquisition module, configured to acquire the bottomhole pressure at a preset first time point before the temporary plugging operation and the bottomhole pressure at a second time point after the temporary plugging operation;
a determination module, configured to determine whether the temporary plugging operation is effective by comparing the difference between the bottomhole pressure at the second time point and that at the preset first time point with the target diversion pressure.

5 more elements

Dependencies are inferred from the claim text.