Greatwall Drilling and Exploration Co.

Beijing, China

Greatwall Drilling and Exploration Co.

Beijing, China
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Li D.,Great Wall Drilling and Exploration Co.
Well Testing | Year: 2011

To problems of high temperature and pressure in Jidong oilfield, and oil and well testing for well of the hill, the conventional tester and supporting tools have been developed. The improved negative pressure test valve has features of permanently locked performance, simplified structure, less sealing parts, increasing diameter, which increases the testing reliability in wells of the high temperature and pressure, high gas oil ratio, and big deviated degree. Test string can meet the need of acid treatment operation with large-scale, highpressure pump pressure, and can be directly transformed into production string, which expands the adaptability of the test.


Bie B.,Dagang Oilfield Company | Li D.,Great Wall Drilling and Exploration Ltd Company | Shurong H.,Dagang Oilfield Company | Zhao J.,Nanpu Operation Block Geology Institute
Well Testing | Year: 2011

Well test technology is a method of detecting reservoir directly and also a important means of reservoir evaluation and production dynamic monitoring. Using pressure recovery delineation testing technology, one can calculate reservoir seepage parameters and reservoir pressure, obtain perfect degree of gas well, and determine the location of oil-water interfaces and fault. So well test technology is very important to accelerate oil field rolling exploration and development pace and enhance the productivity construction.


Xiaolong Y.,Great Wall Drilling and Exploration Co. | Yonghong R.,Petrochina | Yiguo W.,No. 4 Oil Production Plant
Well Testing | Year: 2010

According to design principle of the "safe, economic, and science", assumed specific design elements of selection method, borehole requirement, engineering parameter, work system, operation preparation, risks and response measures as the studying objectivity, the open hole test design is regulate and optimized so as to guide the field operation of the open hole well test and improving the success rate effectively.


Liming S.,Great Wall Drilling and Exploration Company | Shudong X.,Great Wall Drilling and Exploration Company | Xinfeng L.,Petrochina
Well Testing | Year: 2011

During well testing process for production well of oil and gas field, due to the effect of Phase Differentiation of wellbore on pressure and temperature curve at early shut-in time, a so-called "hump" effect is appeared. The "hump" feature is always reflected in the pressure recovery curve when oil well appears phase reflection, and it is reflected in the temperature curve when gas well appears phase reflection, In actual work of well testing interpretation, that of unclear this two obvious features of phase variation affects the interpretation results. By analyzing the oil, gas phase state of differentiation of characteristics, the corresponding identification method is induced and summarized, a reasonable test solution is proposed. The program can eliminate adverse effects of the "hump" on test interpretation.


Fan J.,Greatwall Drilling and Exploration Co. | Li X.,Greatwall Drilling and Exploration Co. | Zhang J.,Greatwall Drilling and Exploration Co. | He R.,Greatwall Drilling and Exploration Co. | Ding G.,Greatwall Drilling and Exploration Co.
Drilling Fluid and Completion Fluid | Year: 2010

KCl-polymer drilling fluid was developed for overcoming the drilling problems in Azerbaijan, such as high mud density, heavy swelling of mud shale, collapsing and high friction of mud cake. Field application showed that KCl-polymer drilling fluid had good inhibitive and rheological performance with low viscosity, filter loss was reduced to 3.0-3.5 mL or even lower. High quality of the mud cake met the requirement and made drilling smoothly.


Zeng Y.,Great Wall Drilling and Exploration Co. | Chen H.,Great Wall Drilling and Exploration Co. | Hu Y.,Great Wall Drilling and Exploration Co. | Jiang J.,Great Wall Drilling and Exploration Co. | Liu D.,Great Wall Drilling and Exploration Co.
Well Testing | Year: 2012

Production data of the reservoir is an estimation issue of the nonlinear parameters which is necessary to apply nonlinear regression analysis theory. The Common algorithms of Non-linear regression used to estimate model parameters include direct search method, Hooke-Jeeves method, Nelder-Mead method, Gauss-Newton method, variable metric method and homotopy algorithm, etc. The modified nonlinear least-square method is used to predict the main reservoir parameters, including the distribution of permeability and porosity, and to match the corresponding bottom-hole pressure, which acquires a satisfied result and provides a feasible method to forecast parameters by using production data.


Yang J.,Greatwall Drilling and Exploration Co. | Jia J.,Greatwall Drilling and Exploration Co. | Mu X.,Greatwall Drilling and Exploration Co. | Yang X.,Greatwall Drilling and Exploration Co.
Drilling Fluid and Completion Fluid | Year: 2011

In Cuba, the extended reach well is applied to deal with complex formations, which the measured depth is 4 000-6 000 m, the hole deviation angle is over 80°, and the horizontal displacement is 3 500-5 500 m. Many downhole problems are encountered in Guanabo area, which are tight pulling while POOH, reaming difficult while RIH, caving, tight hole, lost circulation and pipe stuck. In well GBO-103, located in Guanabo area, a high inhibitive performance drilling fluid system of POLYMER-KCl-POLYCOL is applied, with contents of FA-367 over 0.6%, KCl 10%, and Polycol 1%-3%. The application shows that, compared with the other wells in the same area, the well depth is deepest, the drilling period is the shortest, the accident quantity is the least, and the cost is the lowest, besides, the lubrication is good and each logging is smooth.

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