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A self-cleaning fracturing proppant and its application

A clean fracturing and proppant technology, applied in wellbore/well parts, production fluid, earthwork drilling and production, etc., can solve the problems of reduced conductivity and easy blockage of fractures, and achieve increased fracture conductivity and enhanced Fracture conductivity, the effect of improving fracture conductivity

Active Publication Date: 2019-09-24
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the existing technology, especially the existing proppant makes the fractures easy to block and reduces the conductivity, the present invention provides a self-cleaning fracturing proppant that increases the fracture conductivity and its application

Method used

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  • A self-cleaning fracturing proppant and its application
  • A self-cleaning fracturing proppant and its application
  • A self-cleaning fracturing proppant and its application

Examples

Experimental program
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Effect test

Embodiment 1-8

[0030] A self-cleaning fracturing proppant, comprising a proppant particle framework, the proppant particle framework is ellipsoidal, and a cylindrical channel passing through the ellipsoid is arranged on the major axis of the ellipsoid, and the cylindrical The acid etching solution is filled in the cylindrical channel, and the two ends of the cylindrical channel are sealed by a degradable polymer.

[0031] The cylindrical passage is established in the following manner: a hole is opened along the long axis of the ellipsoid, and the cylinder radius of the cylindrical passage is one-fifth to one-third of the length of the short axis of the ellipsoid. The schematic diagram of the appearance of the proppant particle framework is shown in figure 1 shown, from figure 1 It can be seen that there is one channel drilled in the proppant particle frame, along the long axis of the ellipsoid, the structure is stable and the force is uniform.

[0032] The total volume of the proppant is d...

Embodiment 9

[0037] The application of the proppant described in embodiment 1-8 comprises steps as follows:

[0038] (1) At the beginning of fracturing, the pre-fluid is pumped into the formation to form cracks of a certain width and length in the formation;

[0039] (2) The sand-carrying liquid mixed with the proppant described in Examples 1-8 was mixed with 3-10m 3 / min displacement is pumped into the formation to support the fracture geometry that has formed.

[0040] In step (2), the volume fraction of the proppant in the total volume of the sand-carrying liquid is the sand ratio, and the sand ratio is 80%.

[0041] After the crack is closed, the sealed degradable polymer material degrades, and the acid etching liquid contained inside flows out, and dissolves the impurities and debris that block the crack, and causes uneven etching on the crack wall, enlarging the crack diversion capacity. The proppant with holes inside and the voids etched by the acid etching solution form a new fr...

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Abstract

The invention relates to a self-cleaning fracturing propping agent and application thereof. The self-cleaning fracturing propping agent comprises a propping agent particle frame which is shaped like an ellipsoid, a cylindrical channel running through the ellipsoid is arranged on the along axis of the ellipsoid and is filled with an acid etching solution, and the two ends of the cylindrical channel are closed through degradable polymers. According to the invention, the propping agent is filled with the acid etching solution, so that a better effect is provided for the carbonate rock stratum. No loss is caused before the acid etching solution is injected into the stratum, and the acid etching solution can effectively reach the inside of the stratum, so that the stratum is not blocked and the river diversion space is enlarged. The whole propping agent particle is shaped like the ellipsoid, more easily suffers from resistance of sand carrying fluid, namely, is more easily transferred along with the sand carrying fluid, compared with a single particle frame.

Description

technical field [0001] The invention relates to a self-cleaning fracturing proppant for increasing fracture conductivity and application thereof, which belongs to the technical field of oil and gas field development. Background technique [0002] Low-permeability and ultra-low-permeability oil and gas reservoirs are widely distributed in my country. Most low-permeability oil and gas reservoirs are difficult to obtain industrial oil and gas without reservoir stimulation. At present, hydraulic fracturing technology and acid fracturing technology are mainly used to stimulate oil and gas reservoirs. The purpose of hydraulic fracturing is to create a flow path from the formation to the wellbore, increasing the productivity of oil and gas wells. Conventional fracturing technology usually uses proppant to fill fractures, keep the fractures open, and make the fractures have high conductivity, so as to establish effective production channels. Therefore, in hydraulic fracturing, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/80E21B43/267
Inventor 温庆志张东晓牟绍艳王会杰
Owner PEKING UNIV
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