A shale reservoir controlled fracture uniform expansion fracturing method

A shale reservoir and fracturing technology, which is applied in the field of unconventional oil and gas reservoir development, can solve problems such as the promotion and application of limited volume fracturing technology and large stress differences, and achieve the promotion of cost reduction and efficiency increase development, strong adaptability, large The effect of practical application value

Active Publication Date: 2022-05-06
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

The above two volume fracturing techniques are affected by the special geological factors of my country's shale (such as strong heterogeneity of mechanical properties, large stress difference, etc.), and there are certain restrictions on their stimulation effects. It also limits the popularization and application of these two types of volume fracturing technologies to a certain extent.

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  • A shale reservoir controlled fracture uniform expansion fracturing method

Examples

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Embodiment 1

[0051] As the most basic embodiment of the present invention, this example discloses a shale reservoir fracture-controlled uniform expansion fracturing technology, which specifically includes the following steps:

[0052] A shale reservoir controlled fracture uniform expansion fracturing technology specifically includes three key methods and technical components: fracturing scheme design, well-entry material selection, and on-site construction implementation. The specific steps are as follows:

[0053] Step 1: Fracturing scheme design, which mainly includes segmental design, perforation design, scale design and temporary plugging design.

[0054] S1: Segmented design, that is, it is required that the proposed rupture pressure difference within the segmented length is less than the temporary plugging capacity, that is:

[0055] f(△σ,△p p )d (1)

[0056] where f(△σ,△p p ) is the pseudo-rupture pressure difference of the length of the segment, △σ is the stress difference with...

example 1

[0077] The optimal proppant combination determined in Example 1 is 40 / 70 mesh ceramsite with a strength greater than 50MPa and 100 mesh quartz sand with a strength greater than 30MPa, and the combination ratio range of the two is 0.3-0.7.

[0078] S6: Optimal fracturing fluid, the viscosity that meets the requirements of fracture creation and sand carrying is:

[0079] mu 1 >max{μ f ,μ p} (11)

[0080] where μ f ,μ p Respectively are the fluid viscosities that meet the requirements of fracture-making and sand-carrying, and the viscosity required to meet the production conditions is:

[0081] mu 2 s ,r l ) (12)

[0082] where r s ,r l are the median pore throat and fluid molecular radius of the shale reservoir, f(r s ,r l ) is the viscosity of the fluid before breaking. According to this, there is a preferred range of fracturing fluid viscosity:

[0083] μ∈[μ 1 ,μ2 ] (13)

[0084] The optimal fracturing fluid viscosity range determined in Example 1 is 1.6-5.4 mP...

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Abstract

The invention discloses a shale reservoir controlled fracture uniform expansion fracturing method, which belongs to the technical field of unconventional oil and gas reservoir development, and specifically includes three key methods and technical components: fracturing scheme design, well-entry material selection, and on-site construction implementation. . (1) Fracturing scheme design, mainly including stage design, perforation design, scale design and temporary plugging design; (2) Well entry material selection, mainly including proppant selection and fracturing fluid selection; (3) On-site construction implementation, It mainly includes two parts: temporary plugging construction and sand adding mode. Compared with box stimulation theory and dense cutting technology, this method has the advantages of larger volume of stimulation, higher complexity of fractures, and better production efficiency of reservoirs. It is suitable for popularization and application in shale gas blocks in southern my country, and provides feasible technical means for the efficient development of shale gas wells.

Description

technical field [0001] The invention belongs to the technical field of unconventional oil and gas reservoir development, and in particular relates to a shale reservoir fracture-controlled uniform expansion fracturing technology. [0002] technical background [0003] my country's shale gas development has gone through three rounds, from the first round of learning foreign advanced experience and imitating field practice to the second round of introduction and independent development, in some fields to carry out mining based on the actual situation of my country's shale reservoirs field tests and achieved certain breakthroughs, and then actively carried out pilot tests in the third round of self-developed and supplemented by reference, and made progress in many fields of shale gas development. With the deepening of understanding of my country's shale reservoirs, the benefits of shale gas development have been greatly improved. Especially for the shale reservoirs shallower than...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/267E21B49/00G06F30/20
CPCE21B43/26E21B43/261E21B43/267E21B49/00G06F30/20
Inventor 张庆李彦超何封邓才沈建国肖剑锋杨亚东邓翔冯强
Owner BC P INC CHINA NAT PETROLEUM CORP
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