Drilling fluid, and local crushing formation inclined well inverse well guide hole drilling process
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A water-based drilling fluid and pilot hole technology, applied in directional drilling, wellbore/well components, drilling composition, etc., can solve the problems of insufficient inhibition performance, difficulty in solving wellbore, unstable wellbore, etc. Conducive to stability and storage protection, improving the ability to stabilize the well wall, preventing the effect of well wall collapse
Active Publication Date: 2017-12-15
STATE GRID CORP OF CHINA +3
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[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the existing water-based drilling fluid is difficult to solve the problem of wellbore instability and wellbore leakage, and there is a problem of insufficient suppression performance, so as to provide a multi-functional water-based drilling fluid. Fluid and Raise Well Pilot Hole Drilling Technology Using It in Partial Fractured Stratum
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Embodiment 1
[0041] A water-based drilling fluid consisting of:
[0042] Sodium bentonite 1.5g, polyacrylamide 0.3g, aluminum chloride 4g, iron chromium lignosulfonate 1g, sulfonated pitch 2g, water 100g.
[0043] In 100g of clear water, add each component in the formula amount, stir well, make it mix completely and uniformly, obtain the described water-based drilling fluid.
Embodiment 2
[0045] A water-based drilling fluid consisting of:
[0046] Sodium bentonite 3g, polyacrylamide 0.1g, aluminum chloride 6g, iron chromium lignosulfonate 3g, sulfonated pitch 4g, water 100g.
[0047] In 50g of clear water, add the remaining components in the formula amount, stir for 2 minutes, then add 50g of water, stir well, make it completely and evenly mixed, and obtain the water-based drilling fluid.
Embodiment 3
[0049] A water-based drilling fluid consisting of:
[0051] In 100g of clear water, add each component in the formula amount, stir well, make it mix completely and uniformly, obtain the described water-based drilling fluid.
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Abstract
The invention belongs to the technical field of inclined well construction, and discloses drilling fluid, and a local crushing formation inclined well inverse well guide hole drilling process adopting same. The drilling fluid comprises bentonite, a coating agent, inorganic salt, a viscosity/filtration loss reducer, a wall protective agent and water, and the components are in synergistic cooperation, so dispersion of clay and rock debris is effectively inhibited, the well wall stabilizing ability is improved and the downhole safety of well drilling is effectively guaranteed. According to the local crushing formation inclined well inverse well guide hole drilling process, the aims of carrying the rock debris and returning slag, balancing the pressure of the bottom layer, stabilizing the well wall and the like are fulfilled by injecting the drilling fluid provided by the invention; and the inverse well guide hole drilling process can perform construction in the fractured formation, so the construction efficiency is increased by above 25 percent and the application range of the reverse well method is widened.
Description
technical field [0001] The invention belongs to the technical field of inclined well construction, and in particular relates to a drilling fluid and a process for drilling pilot holes in inclined wells in partially broken formations using the drilling fluid. Background technique [0002] There are a large number of inclined well shafts in the water diversion system of the pumped storage power station. These inclined wells are mostly arranged at about 50°, and have the characteristics of long length and large diameter. The safe construction of the inclined well section is the key to the construction of the entire water delivery system. At present, such inclined wells usually adopt the construction method of "pilot well excavation, and then expand the excavation". There are two types of pilot well excavation, one is the pilot well drilled by a raise drilling rig, and the other is the tank climbing method. Among them, the crawling irrigation method requires a large number of p...
Claims
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Application Information
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