2021
DOI: 10.1155/2021/5514427
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Study on Method of Determining the Safe Operation Window of Drilling Fluid Density with Credibility in Deep Igneous Rock Strata

Abstract: It is difficult to determine the safe operation window of drilling fluid density (SOWDFD) for deep igneous rock strata. Although the formation three-pressure (pore pressure, collapse pressure, and fracture pressure) prediction method with credibility improves the accuracy of formation three-pressure prediction, it still has a large error for deep igneous strata. To solve this problem, a modified method of the SOWDFD in deep igneous rock strata is proposed based on the leakage statistics of adjacent wells. This… Show more

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Cited by 6 publications
(6 citation statements)
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“…Second, the test of hydration expansion performance of the underground igneous rock core is carried out. Both the hydration expansion performance and the rolling recovery rate can be used to evaluate and analyze the hydration expansion capacity and borehole wall instability mechanism of borehole wall rocks under downhole pressure. The drilling fluid used to soak the core in the experiment is a water-based drilling fluid used in the field. The specific formula of the drilling fluid is as follows: 4% Bentonite + 1% LV-CMC + 1% NH4HPAN + 0.2% Coated with flocculant + 0.5% COP-HFL/LFL + 0.3% NaOH.…”
Section: Methodsmentioning
confidence: 99%
“…Second, the test of hydration expansion performance of the underground igneous rock core is carried out. Both the hydration expansion performance and the rolling recovery rate can be used to evaluate and analyze the hydration expansion capacity and borehole wall instability mechanism of borehole wall rocks under downhole pressure. The drilling fluid used to soak the core in the experiment is a water-based drilling fluid used in the field. The specific formula of the drilling fluid is as follows: 4% Bentonite + 1% LV-CMC + 1% NH4HPAN + 0.2% Coated with flocculant + 0.5% COP-HFL/LFL + 0.3% NaOH.…”
Section: Methodsmentioning
confidence: 99%
“…Because of the strong uncertainty of deep well complex formation information and the limitations and incompleteness of the existing seismic and logging interpretation model, the author team proposed a quantitative description method of drilling geomechanical parameters under the condition of uncertain information [15][16][17][18]. According to the constraint conditions of pressure balance in the open-hole section, a safe drilling fluid density window with credibility is constructed.…”
Section: Pre-drilling Quantitative Evaluation Methods Of Downhole Eng...mentioning
confidence: 99%
“…The basic principle of this method is shown in Figure 2, the probability distribution of geological characteristic parameters is obtained through probability statistics and Monte Carlo simulation methods, and then combined with the drilling construction methods, based on the stress-strength interference theory, the quantitative risk assessment of the whole well section is realized. The specific method is in literature [15][16][17][18], which will not be described here. Since the quantitative risk assessment method is based on the formation pressure profile with credibility, well structure, and construction (drilling fluid density/ECD) scheme, it can satisfy the needs of this paper to compare and analyze the potential engineering risks of conventional drilling and MPD in different wellbore sections.…”
Section: Pre-drilling Quantitative Evaluation Methods Of Downhole Eng...mentioning
confidence: 99%
“…5,6 In serious cases, it may even lead to the scrapping of the borehole, causing significant economic losses. 7 The high-precision leakage pressure prediction is the basis for preventing lost-circulation. 2 At present, the research on leakage theory is not complete, and the traditional calculation models that treat formation fracture…”
Section: Introductionmentioning
confidence: 99%