Well spacing and stratum treating method for oil shale in-situ exploiting
A technology of in-situ mining and oil shale formation, applied in the direction of fluid extraction, directional drilling, earthwork drilling and production, etc., can solve the problems of low porosity and permeability, improve porosity and connectivity, improve quality and recovery The effect of efficiency and material saving
Active Publication Date: 2018-01-09
JILIN UNIV
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[0003] Aiming at the problems of dense primary oil shale rock and low porosity and permeability in the construction process of in-situ cracking and mining of oil shale, in order to effectively save materials, save energy and adhere to the principles of sustainable utilization, the present invention provides a Reasonable and scientific well layout and formation treatment methods for in-situ cracking of oil shale to improve the quality and recovery of oil shale in-situ cracking
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[0018] see figure 1 and figure 2 As shown in Fig. 1, determine the mining area of oil shale in-situ cracking, and determine the positions of the upper roof and lower floor of oil shale. The oil shale layer is located at 460m to 489m underground; the mining area of oil shale is a rectangular area with a length of 180m and a width of 80m. The first horizontal well 1 is drilled at a distance of 20m from the left edge of the production area, and the length of the first horizontal well 1 is 180m and is located on the upper roof of the oil shale layer; the second horizontal well 2 is drilled at a distance of 20m from the right edge of the production area. The flat well 2 is 180m in length and drilled to the lower floor of the oil shale formation. The first horizontal well 1 and the second horizontal well 2 are obliquely symmetrical; 6 vertical wells are respectively arranged in the production area. Three vertical shafts are arranged on both sides of the flat shaft 2, that is,...
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The invention discloses a well spacing and stratum treating method for oil shale in-situ exploiting. In the range of the oil shale exploiting area, two horizontal wells and six vertical wells are spaced; all the vertical wells are spaced on the two sides of the oil shale exploiting area, the first horizontal well and the second horizontal well are spaced in a skew-symmetric mode, the first horizontal well and the second horizontal well are drilled to penetrate through an upper top plate and a lower bottom plate of an oil shale. Distances in the horizontal direction and vertical direction existbetween the first horizontal well and the second horizontal well and are in a nested state; branch wells are jetted out from the first horizontal well and the second horizontal well by adopting a hydraulic jetting mode; three branch wells in the oil shale stratum are directionally jetted out towards the lower part and the upper part from the first horizontal well and the second horizontal well byusing a hydraulic jetting drill; and finally, the branch wells of the first horizontal well, the branch wells of the second horizontal well and all the vertical wells communicate by using the hydraulic fracturing mode, cracks are further developed, and the porosity and the permeability are further improved.
Description
technical field [0001] The invention relates to the field of in-situ cracking and exploitation of oil shale, in particular to a well layout and formation treatment method for in-situ exploitation of oil shale. Background technique [0002] The key to realize the in-situ mining of oil shale is to complete the cracking of kerogen downhole. Usually, the oil shale layer is located between the upper roof and lower floor of the sedimentary basin, and the rock formation is relatively dense, and its permeability and porosity are relatively low. Therefore, trying to improve the permeability and porosity of oil shale can effectively improve the quality of in-situ cracking of oil shale and the oil and gas recovery. At present, the in-situ mining of oil shale is mainly researched on its mining method and heating method (such as: CN 103321618 A), or underground heaters and heating systems (such as: CN104775801A; CN204457711U, etc.). There are relatively few studies on well layout and fo...
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IPC IPC(8): E21B43/30E21B43/26E21B43/24E21B7/18E21B7/04
Inventor 孙友宏赵帅李强韩婧刘召康世杰陈强王振东
Owner JILIN UNIV