High-efficiency acidizing design method for ultra-deep fractured carbonate reservoirs
A carbonate rock reservoir and design method technology, applied in design optimization/simulation, earthwork drilling, special data processing applications, etc. And other issues
Active Publication Date: 2020-06-12
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
If the construction displacement and acid consumption are too small, the natural cracks cannot be opened, and the natural cracks cannot be deeply deblocked; the construction displacement and acid consumption are too large, which will not only increase the construction risk, but also increase the economic cost
Method used
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[0161] The present invention will be further described below in conjunction with accompanying drawings and field application examples.
[0162] This embodiment is intended to illustrate and explain the present invention, but not to limit the scope of the present invention.
[0163] A high-efficiency acidizing design method suitable for ultra-deep fractured carbonate reservoirs, the specific process is as follows:
[0164] In a carbonate gas reservoir, an open hole completion vertical well was drilled to a depth of 7512m, and 79m of mud was lost during the drilling of the 7332-7371m well section 3 . According to the well logging data, it is judged that the section with natural fractures is developed, and the natural fractures in this section are planned to be acidified and plugged. The relevant parameters of this well are shown in Table 1.
[0165] Table 1 Reservoir physical property data, fluid parameter data and wellbore structure data of this well
[0166]
[0167]
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The invention discloses an efficient acidization design method suitable for an ultra-deep layer crack type carbonate reservoir. The design method sequentially includes the following steps that (1) the value range of injection displacement Qinj is calculated, wherein Qro<=Qinj<=Qlim, Qro is natural crack re-open critical displacement, and Qlim is upper limit construction displacement; (2) construction displacement Qop and acid liquor usage amount Vop are designed preferably; (3) a pump injection program is designed. Mechanical characteristics and acid liquor flow reaction characteristics after opening in the natural crack opening process of the carbonate reservoir are considered, reservoir geologic characteristics and engineering conditions are combined, the problem of blindness in deep breakdown acidizing of the ultra-deep layer crack type carbonate reservoir at present can be solved to great extent, the acidizing yield-increasing effect is improved, and the acidizing economical cost is saved.
Description
technical field [0001] The invention relates to a high-efficiency acidification design method for ultra-deep fractured carbonate reservoirs in the field of petroleum engineering, so as to ensure that acid liquid can enter natural fractures to relieve internal pollution, so that natural fractures become high-speed passages for crude oil and natural gas to flow into the wellbore. Improve the effect of acidification to increase production. Background technique [0002] my country's marine carbonate rock oil and gas resources are about 340×10 8 t oil equivalent, and the proven rate is only 11%, and the exploration and development potential is huge (Xie Jinlong, Huang Chong, Wang Xiaoxing. Distribution characteristics of proven reserves of carbonate oil and gas reservoirs in China [J]. Marine Petroleum Geology, 2009, (02) :24-30). In recent years, as my country's marine carbonate exploration targets shift to deep and ultra-deep formations, ultra-deep fractured carbonate rocks, ...
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IPC IPC(8): G06F30/20E21B43/26
CPCE21B43/26G06F30/20
Inventor 郭建春任冀川苟波王坤杰刘壮
Owner SOUTHWEST PETROLEUM UNIV