Adaptive algorithm for identification of the operational indices of oil wells using interval estimates

A procedure for projection and proportional correction of the solution obtained by means of interval estimates is considered. The results of computational experiments which were performed on the actual indices of wells in the Sutorminsky oil field demonstrate the effectiveness of the algorithm. Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 85–93, March–April, 2000.     

The physical and numerical modeling of sand production and gravel pack in oil wells by designing and manufacturing the machine and presenting a relation estimating sand production rate

This research studies the effect of gravel pack size on sand production by designing and manufacturing a machine and a numerical model to simulate sand and gravel pack. This machine and the numerical model make it possible to test different rock along with various fluids under different stress in order to simulate the production of sand and gravel pack.PFC^3D software is applied to create this numerical model. The numerical model consists of sand from 0.22 to 1.1 mm and gravel pack from 3.5 to 4.76, 4.76 to 9.9 to 12.6 and 12.6 to 16.8 mm and the physical model holds gravel from 9 to 4.76 and 4.76 to 9.25. The results from modeling demonstrated that sand is produced the least in the numerical model using gravel from 3.5 to4.76 mm and sand is produced less in the physical model containing gravel pack ranging from 4.76 to 9 mm and the fluid left more output discharge. Moreover, the outcomes from physical modeling proved that as time drags on, the fluid production rate got reduced and then reached to a fixed amount after placing gravel pack. So, it is suggested that gravel pack from 9mm to 4.76mm is more suitable from the viewpoints of fluid production rate and prevention of sand production. Based on dimensional analysis and the results from numerical modeling in a condition without gravel pack, a relation is concluded to estimate sand production rate.     

Control of methane emission from heavy oil wells by gas clustering and utilization

ABSTRACT

A study was undertaken to investigate the means of controlling casing gas (methane) emissions from heavy oil wells in the Lloydminster area in Canada. The study was aimed at providing a better understanding of the current casing gas methane emissions in the area and evaluating the potential for reducing these emissions by alternative technologies. Current casing gas emissions in the area were evaluated based on the best available information, and a database was established. Short-term trends of casing gas availability were forecasted. A Geographic Information System (GIS) was employed to simulate a multi-level gas clustering process. An optimization model was developed to evaluate potential technology applications and to find the least-cost solutions for reducing methane emissions in the study area.     

Detecting changes in the operational states of hydrocyclones

In this investigation, video recordings of the underflow discharge of a pilot plant hydrocyclone were collected during classification of different precious metal ores. The underflow shape was monitored by determining the underflow width along a horizontal line through the image. This was accomplished by employing various noise reduction methods and identifying the flow boundaries via motion analysis. Subsequent monitoring of dilute, transitional and dense flow could be automated by embedding the underflow width measurements and making use of one-class support vector machines to estimate the distributional densities of the data in the resultant phase space. Experimental results suggest that the approach could provide a practical and inexpensive means of monitoring the operational states of hydrocyclones.     

煤层气U型井水平井套管完井技术探讨

U型井是煤层气资源开采的一种新型模式,以往经验,U型井水平段多在煤层钻进,采用裸眼或割缝衬管方法完井,但这种方法在煤层顶、底板水平钻进段效果不佳,本文依据工程实例,介绍了套管完井技术在煤层气U型井水平井中的成功应用,不仅保证了井身质量合格,而且为后期压裂排采提供了保障,在类似煤层气U型井水平井完井作业时具有良好的应用前景,可逐步推广。     

吸水井在矿井深部的应用

吸水井直径5.0m,深度7.0m,不用施工配水巷,吸水井内部发碹一道隔壁(隔壁厚同吸水井发碹厚度),把整个吸水井分成三个体积相等扇形断面的配水室,隔壁上安装配水闸门互相连通每个配水室。     

矿用圆环链编链工艺的角度过程能力指数

将过程能力指数的概念扩展到角度质量控制问题,给出角度过程能力指数的计算方法.研究26×92矿用圆环链服从Von Mises分布的弯曲点角度质量特性值当分布中心与公差中心重合时,使角度过程能力指数达到适宜的尺度参数的合理取值范围为[3.39,4.40].导出分布中心在偏离公差中心的情况下,为使角度过程能力指数取得适宜值,分布中心对于公差中心偏离的合理范围的公式.     

The coalbed methane production potential method for optimization of wells location selection

A gas production potential method for optimization of gas wellsite locations selection is proposed in terms of the coalbed gas resources volume and the recoverability. The method uses the actual data about reservoirs in a coalbed gas field in central China to optimize wellsite locations in the studied area in combination with the dynamic data about actual production in the coalbed gas field, selects a favorable subarea for gas wells deployment. The method is established based on the basic properties of coal reservoirs, in combination with the coalbed thickness and the gas content to make an analysis of the gas storage potential of a coal reservoir, as well as resources volume and the permeability of a coal reservoir. This method can be popularized for optimization of wellsite locations in other methane gas development areas or blocks.     

Choice of parameters for explosive destruction of rock based on operational information on the composition of the rock

Nonferrous Metals Scientific Research Institute, Ust-Kamenogorsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 37–44, March–April, 1989.     

煤层气多分支水平井施工工艺

以潞安矿区第一口多分支水平井LA-01H的实钻工程资料和现场施工经验为基础,总结了LA-01H井钻井工艺特点,深入剖析钻井工艺中的经验和教训。通过对多分支水平井进行技术研究,为煤层气开发提供了一种新的方法。