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Method for creating branch seam with temporary plugging and pressure buildup using super absorbent resin

a super absorbent resin and branch seam technology, applied in fluid removal, chemistry apparatus and processes, borehole/well accessories, etc., can solve the problems of low fracturing efficiency, difficult to extrude complex multi-level fracture networks, and hot issue of unconventional oil and gas resources, etc., to increase the production of oil, increase the fracture network area, and strengthen the connection

Inactive Publication Date: 2020-06-11
XI'AN PETROLEUM UNIVERSITY
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  • Abstract
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  • Claims
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AI Technical Summary

Benefits of technology

The present invention provides a method for creating a branch fracture with temporary plugging and pressure buildup using super absorbent resin. This method can form a complex multi-level fracture network in one process, with little resin residue after fracturing and little damage to fracture conductivity. This solves the problems faced by conventional hydraulic fracturing technology and greatly increases the effect of transformation of the reservoir and improves the rate of oil and gas recovery. The method involves injecting pad fluid containing ammonium sulfate and hydrochloric acid to dissolve the salt-intolerant super absorbent resin and the broken strong salt-tolerant super absorbent resin residue, and increasing the length of the main fracture and branch fracture by pumping pressure. The super absorbent resin absorbs water and does not absorb oil or react with the reservoir during the construction process, without damaging the reservoir. After the construction, the super absorbent resin is dissolved by a mixed solution of ammonium persulfate and hydrochloric acid, with almost no resin residue existing after flow back and minimal damage to fracture conductivity.

Problems solved by technology

With the acceleration of the exploration and development of unconventional oil and gas resources such as tight oil, shale gas and coalbed gas, the effective development of unconventional oil and gas resources has become a hot issue in the world.
At present, the main disadvantage of conventional hydraulic fracturing technology is that it is often difficult to extrude a complex multi-level fracture network in reservoirs with abundant oil and gas and most fracture networks formed have a single shape and few horizontal and vertical expansions.
Even some fracturing construction can only extrude one main fracture in the reservoir, which has almost no effect on the transformation of the reservoir, resulting in very low fracturing efficiency.
This makes it difficult to transport and produce oil and gas, and the yield is not significantly improved after fracturing construction.
How to extrude a branch fracture to form a multi-level fracture network system has become a bottleneck problem restricting the development of hydraulic fracturing technology.

Method used

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  • Method for creating branch seam with temporary plugging and pressure buildup using super absorbent resin

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embodiment 1

[0028]A method for creating a branch fracture with temporary plugging and pressure buildup using super absorbent resin, comprises the following steps:

[0029]Step 1: setting a fracturing packer, injecting pad fluid of 45 m3, and using the pad fluid to fracture a target layer to form a main fracture 1;

[0030]Step 2: selecting starch graft polyacrylamide with a particle size of 0.7 mm, a water absorption ratio of 45 g / g, and a compression strength per cubic centimeter in saturated brine of 0.06 MPa-1 MPa as salt-intolerant super absorbent resin 3; selecting a ternary copolymerized salt-tolerant acrylic acid super absorbent resin with a particle size of 0.5 mm, a water absorption ratio of 175 g / g, and a compression strength per cubic centimeter in saturated brine of 0.02 MPa as strong salt-tolerant super absorbent resin 2; continuously injecting pad fluid of 7 m3 mixed with salt-intolerant super absorbent resin 3 into the main fracture 1 at a speed of 4.5 m3 / min; then injecting pad fluid ...

embodiment 2

[0036]A method for creating a branch fracture with temporary plugging and pressure buildup using super absorbent resin, comprises the following steps.

[0037]Step 1: setting a fracturing packer, injecting pad fluid of 37 m3, and using the pad fluid to fracture a target layer to form a main fracture 1;

[0038]Step 2: selecting cellulose grafted polyacrylamide with a particle size of 1.5 mm, a water absorption ratio of 75 g / g, and a compression strength per cubic centimeter in saturated brine of 1.2 MPa as salt-intolerant super absorbent resin 3; selecting a ternary copolymerized salt-tolerant acrylic acid super absorbent resin with a particle size of 1.2 mm, a water absorption ratio of 245 g / g, and a compression strength per cubic centimeter in saturated brine of 0.05 MPa as strong salt-tolerant super absorbent resin 2; first continuously injecting pad fluid of 6 m3 mixed with salt-intolerant super absorbent resin 3 into the main fracture 1 at a speed of 5.5 m3 / min; then injecting pad fl...

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Abstract

A method for creating a branch fracture with temporary plugging and pressure buildup using super absorbent resin, comprising: setting a fracturing packer to fracture a target layer by pad fluid to form a main fracture; injecting into the main fracture pad fluid mixed with salt-intolerant super absorbent resin and performing replacement till depth of the main fracture, and then injecting pad fluid mixed with strong salt-tolerant super absorbent resin; after the strong salt-tolerant super absorbent resin absorbs water and expands to form a temporary plugging layer, re-injecting the pad fluid to create a branch fracture with pressure buildup; and lifting injection pressure to break up the temporary plugging layer formed by the strong salt-tolerant super absorbent resin to form residue, transporting the residue to the depth of the main fracture to bridge the temporary plugging layer formed, and re-building up pressure to create a branch fracture.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of priority from Chinese Patent Application No. 201811495751.X, filed on Dec. 7, 2018. The content of the aforementioned application, including any intervening amendments thereto, is incorporated herein by reference in its entirety.TECHNICAL FIELD[0002]The invention relates to the field of petroleum engineering hydraulic fracturing, and in particular, to a method for creating a branch fracture with temporary plugging and pressure buildup using super absorbent resin.BACKGROUND OF THE INVENTION[0003]With the acceleration of the exploration and development of unconventional oil and gas resources such as tight oil, shale gas and coalbed gas, the effective development of unconventional oil and gas resources has become a hot issue in the world. Hydraulic fracturing technology is an effective means for economic development of unconventional oil and gas. However, in order to form a sand packed fracture with hig...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B43/26E21B43/24
CPCE21B43/261E21B43/2405C09K8/5086E21B33/13C09K8/516C09K8/70C09K8/74C09K8/92E21B43/26
Inventor ZHOU, DESHENGWANG, HAIYANGXIAO, PEIYAOLI, XINRUCAI, WENBINLIU, SHUNLIU, YAFEILIU, XIONGMA, XIANLINLEI, XINQU, GUANZHENG
Owner XI'AN PETROLEUM UNIVERSITY
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