Proppant and method for improving shale reservoir fracturing crack supporting effect

A shale reservoir and proppant technology, which is applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve problems such as the inability to contribute seepage channels, achieve low cost, reduce contact area, and improve effect Effect

Active Publication Date: 2022-02-08
CHONGQING INST OF GEOLOGY & MINERAL RESOURCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a proppant and method for improving the propping effect of fracturing fractures in shale reservoirs, which can effectively improve the fracture propping of deep shale reservoirs Effect, improve the effective permeability of fracturing fractures, and overcome the problem that the fractures formed by fracturing in deep shale reservoirs are not supported, resulting in the formation of invalid channels after fracturing, which cannot contribute to seepage channels.

Method used

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  • Proppant and method for improving shale reservoir fracturing crack supporting effect
  • Proppant and method for improving shale reservoir fracturing crack supporting effect
  • Proppant and method for improving shale reservoir fracturing crack supporting effect

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Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1, a proppant for improving the propping effect of fracturing fractures in shale reservoirs, made of the following components by weight percentage: 60wt% of waste ceramics, 10wt% of manganese ore powder, 10wt% of red mud and 20 % of bauxite powder. The proppant is a granular material, the particle shape is ellipsoid, regular octahedron and regular dodecahedron, and the mass ratio of ellipsoid particle 1, regular octahedral particle 2 and regular dodecahedral particle 3 is 1: (1~2): (0.5 ~1).

[0037] The waste ceramics is waste from making ceramic utensils, the content of alumina in the waste ceramics is 30-40wt%, and the content of silicon oxide is 20-40wt%.

[0038] The manganese ore powder is made of primary manganese ore, the content of manganese tetraoxide in the manganese ore powder is 5-30wt%, and the content of manganese oxide is 50-80wt%.

[0039] The red mud is the waste after alumina is extracted during aluminum production, and the sum of the con...

Embodiment 2

[0043] Embodiment 2, a proppant for improving the propping effect of fracturing fractures in shale reservoirs, made of the following components by weight percentage: 60wt% of waste ceramics, 15wt% of manganese ore powder, 15wt% of red mud and 10 % of bauxite powder. The preparation process is specifically as follows: firstly, the waste ceramics are ground into granules with a diameter of 0.1-1.5 mm. Grind manganese ore and bauxite into powder respectively. The mass ratio of waste ceramic particles: manganese ore powder: red mud: bauxite is prepared according to the ratio of 6:1.5:1.5:1. Then mix ceramic particles, manganese ore powder, red mud, and bauxite powder in the mixer to form a mixture, so that the uniformity of the mixture is greater than 85% and above.

[0044] Then transfer the homogeneously mixed mixture to a high-temperature combustion kiln, and burn it at a temperature of 1200-1300°C for 5 hours, after fully reacting. Three different shapes of ellipsoid, regul...

Embodiment 3

[0046] Embodiment 3, a method for improving the support effect of fracturing fractures in shale reservoirs, comprising the following steps:

[0047] Step 1, perforating the fracturing target section of the shale reservoir; the shale reservoir is a deep shale gas horizontal well in a certain block, the target layer is the Longmaxi Formation, the well depth is 6400m, and the vertical depth is 4560m. The length of the horizontal section is 1600m, the bottom hole temperature is 145°C, the maximum in-situ stress is 110Mpa, and it is divided into 20 sections with a length of 4850~6400m. During the perforating operation, there are 3 clusters of perforation, each cluster of perforation section is 1.5m long, the hole density is 16 holes / m, the phase angle is 60°, and the total number of holes is 72 holes.

[0048] Step 2. Inject the pre-fluid: pump the pre-fluid with variable displacement, and use 3m one by one 3 / min, 5m 3 / min, 8m 3 / min, 14m 3 / min, 9m 3 / min, 7.5m 3 / min, 13m...

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Abstract

The invention discloses a proppant and a method for improving the shale reservoir fracturing crack supporting effect. The proppant is prepared from the following components in percentage by weight: 30-60 wt% of waste ceramic, 5-15 wt% of manganese mineral powder, and 5-15 wt% of red mud, with the balance being bauxite powder. The proppant is a particle material, the particle shape is an ellipsoid, a regular octahedron or a regular dodecahedron, and the mass ratio of the ellipsoid particle to the regular octahedron particle to the regular dodecahedron particle is 1: (1-2): (0.5-1). The proppant can effectively improve the fracture supporting effect of the deep shale reservoir, improve the effective permeability of the fractured fractures, and solve the problem that the fractures formed by fracturing of the deep shale reservoir are not supported, so that the fractures are closed to form invalid channels after fracturing is finished, and seepage channels cannot be contributed.

Description

technical field [0001] The invention relates to the field of transformation of shale gas reservoirs, in particular to a proppant and a method for improving the propping effect of fracturing fractures in shale reservoirs. Background technique [0002] Since the successful commercial development of shale gas in my country, major breakthroughs have been made in Fuling, southern Sichuan and other regions. Obtained a complete set of key technologies for the exploration and development of shallow, mid-deep shale gas, but deep shale gas exploration and development technology still faces many bottlenecks, among which fracturing of deep shale reservoirs is one of the difficulties, facing how to form complex fractures network and effectively support cracks and other problems. The fracturing of deep shale reservoirs has been plagued by deep burial, complex and high in-situ stress environment, high closure pressure, and lack of effective proppant support at the distal end of fractures....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/80E21B43/267
CPCC09K8/80E21B43/267Y02P40/60
Inventor 贺培邓智陆朝晖张烨欧阳黎明蒙春吴俊桦吴晓川
Owner CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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