Shale reservoir fracture control uniform expansion fracturing method
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A shale reservoir and fracturing technology, applied in the field of unconventional oil and gas reservoir development, can solve the problems of limited volume fracturing technology promotion and application, large stress differences, etc., to promote cost reduction and efficiency increase development, strong adaptability, experience Reliable effect of parameters
Active Publication Date: 2020-11-03
BC P INC CHINA NAT PETROLEUM CORP +1
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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, e
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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 fracture control uniform expansion fracturing method, and belongs to the technical field of unconventional oil and gas reservoir development. The shale reservoir fracture control uniform expansion fracturing method particularly comprises three key methods and technologies of fracturing scheme design, optimum well entering material selection and field construction implementation. The method comprises the following steps of (1) fracturing scheme design: mainly comprising subsection design, perforation design, scale design and temporary plugging design; (2) optimum well entering material selection: mainly comprising optimum selection of a proppant and fracturing fluid; and (3) field construction implementation: mainly comprising two parts of temporaryplugging construction and sand adding mode. Compared with a box body transformation theory and a close cutting technology, the method disclosed by the invention has the advantages of being larger intransformation size, higher in crack complexity degree, better in reservoir stratum utilization efficiency and the like, besides, the adverse effect of casing deformation and pressure channeling on reservoir stratum yield increase transformation is greatly weakened, and the method is suitable for being applied and popularized in southern shale gas blocks in China and has good application prospects. A feasible technical means is provided for efficient development of the current shale gas well.
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...
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