Horizontal well construction method for promoting fracture dislocation and improving self-supporting capacity
A construction method and technology for horizontal wells, applied in drilling equipment and methods, drilling equipment, directional drilling, etc., can solve problems such as reclosing, and achieve the effects of increasing the number, improving the drainage efficiency, and good self-supporting effect.
Pending Publication Date: 2021-07-13
CHINA UNIV OF MINING & TECH
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Benefits of technology
This technology allows us to use this new method on rocks where there are no existing holes or other weak areas within them without damaging their structure. By choosing an appropriate angle at which we want it to break down into smaller pieces instead of create larger ones with these same angles. These small fragments then form long linear cracks along its length. A special type called MHG (methyl hydrogen sulfide) gas has been used during drilling operations to stimulate oil production from shale deposits around coal mines. It helps improve fluid recovery rates through natural drainage channels.
Problems solved by technology
This patents discusses various methods used during developing new gases (such as natural gas) deposits into nonvolatile gas reserves like those found near our borders worldwide. These techniques involve creation of fissured networks called openings within rocks without causing damage due to excessive tension caused by overburden pressurization. Experimental studies conducted showed that these techniques could lead to improved hydrocarbon recovery rates compared to conventional drill operations. Additionally, researchers discovered that some types of faults present themselves when trying to break up existing ones. Therefore, they proposed studying how to prevent them beforehand.
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Embodiment 1
[0104] Taking a certain shale reservoir as an example, a horizontal well construction method provided by the present invention to promote fracture dislocation and improve self-supporting ability is adopted, such as figure 1 As shown, the main steps are as follows:
[0105] (A) Reservoir parameter detection. The various parameters of shale reservoir rock mechanics and in-situ stress in the described embodiment are as shown in Table 1:
[0106] Table 1 Reservoir parameters
[0107]
[0108]
[0109] (B) shaft construction;
[0110](C) Perforation expansion. As shown in Fig. 2 and Fig. 3, in order to explore the relationship between the angle of the fracture produced by perforation and the dislocation slip of the fracture under the in-situ stress field of the original rock, the opening degree and dislocation degree of the fracture surface were analyzed. Analysis includes vertical principal stress, maximum horizontal principal stress, minimum horizontal principal stress, ef
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The invention discloses a horizontal well construction method for promoting fracture dislocation and improving self-supporting capacity. The horizontal well construction method is suitable for an underground coal mine. The horizontal well construction method comprises the steps that reservoir parameters are detected, and rock mechanical parameters and ground stress parameters of a target mining interval of a reservoir are obtained; a vertical shaft is constructed, and the axial direction of the vertical shaft is perpendicular to the plane where the maximum and minimum horizontal principal stress directions are located; a steering horizontal well is constructed, and an included angle is formed between the axial direction of the steering horizontal well and the maximum horizontal principal stress direction; perforation and crack expansion are carried out in the horizontal well, alternate longitudinal double-wing cracks are generated through perforation, and after crack expansion, a crack face which passes through the axis of the horizontal well and is perpendicular to the plane where the maximum horizontal principal stress and the minimum horizontal principal stress are located is formed between the cracks; and fracture dislocation self-supporting is carried out, specifically, an artificial fracturing means is used for promoting dislocation slippage of the upper section and the lower section of the fracture, and a three-dimensional self-supporting fracture network is constructed.
Description
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