1 With increase of non-Darcy flow coefficient, gas well productivity decreases.

2 To gas well of polluted compound formation, the percolation law of flow is already not conformity to the induced requirement of conventional interpretation way which is needed to modify.

3 During the open and shut-in period of a gas well, the gas flow within the borehole changes into transient flow.

4 At present, all the gas well productivity analysis method need to ascertain the absolute open flow potential; thus need a stable test pot.

5 Unsteady testing for oil and gas well includes testing of drawdown curve and build - up curve.

6 In emergency, the condensate oil produced from gas well will be injected back to formation.

7 Sand production of oil well and gas well is an important problem encountered during oil production.

8 Nowadays, the main method of determining oil and gas well deliverability is steady well test, that is back-pressure testing, isochronal testing, revisionary isochron test and single-point test.

9 For a gas well the flow versus the difference of the squares of the average reservoir and wellbore pressures are plotted on log-log paper.

10 The key problem of producing nodal analysis for gas well is analysis of inflow gaswell.

11 Nowadays the dynamic monitor of horizontal gas well is not started.

12 In production of oil gas well, well - flushing and killing well is indispensable link.

13 Through comparable study of gas well capacity, a simple method is obtained to calculate absolute open flow and to predict production performance of gas well.

14 For volumetric gas reservoir, gas well absolute open flow(AOF) is reduced with the decrease of formation pressure.

15 The horizontal gas well productivity equation in box-shaped drainage volume proposed in the article is fit for productivity evaluation in Daniudi gas field.

16 Gas well productivity equation can show the relationship between flow pressure and production directly.

17 The jet action can largely improve ROP during oil gas well drilling.

18 Research showed that reservoir deformation should be considered when forecasting coalbed gas well productivity.

19 The drilling team is working on a petroleum associated gas well to exploit natural gas.

20 After the analysis on the error existed in the calculation to unresisting flow rate of gas well in Changqing oilfield,[www.Sentencedict.com] the original "one point" method is corrected.

21 Big crror may occur in using the productivity analysis of single - phase gas well for condensate well.

22 So it is necessary to do it based on the gas well production history so as to avoid economic Lows caused by the shut-in.

23 The utility model discloses an external underground cable protective sleeving, relating to an assorted device for oil and gas well underground cables.

24 The paper introduced an anti - corrosive coatings for natural gas well tubes with high sulfur content.

25 Index equation and binomial expression are the main methods to determine the absolute open flow capacity of a gas well at present.

26 The measures of throttling are used widely in natural gas well.

27 Open flow potential will drop down with decline of formation pressure in a gas well.

28 A new two - term deliverability equation is proposed to theoretically compute open - flow gas well after fracturing.

29 Productivity Ratio(PR) is firstly put forward to evaluate the effect of gravel-packing sand control measure on gas well productivity.

30 Big error may occur in using the productivity analysis of single - phase gas well for condensate well.