This paper is mainly about the improvement on the killing well calculation of casing pressure at any depth in hole when there is always mud to circulate before the kick has been detected. By using the mathematical model derived, the calculation in Driller s method has been studied, and relative calculating formulas have been derived. It has been shown that the improved method will accord with the practice more than the conventional "continuous gas column" method.
The monophase fluid flow in triple media is considered as Markovian renewal process, and a mathematical model is set up with a new method in this paper.
Devonian deposition of the overthrust nappe is the typical compensation deposition of the shore and shallow sea in Upper Yangzi passive continental margin. The cyclical deposition of front shore and near shore facies from turbid water terrigenous debris overlaps from the west to the east in the background of continuous water inflow; The mixed deposition of turbid water and clean water is the filled one of regressive sequences form shelf and off-shore to lagoon; In the period of clean water, it is the carbonate platform deposition of shallow water, According to the calculation of the depositional gradient，the horizontal thrust is about 30 kilometers.
Because of the action of the feather fault belts of Tanlu fault-Tai-zhou strike-slip faults and Zhenwu-Xiao ji strikeslip faults，together with the action of deep subcrustal materials in the basin, the uplift of the mantle and the rising of Mho-plane, the block is caused to slip along Yinzhi erosion surface so as to form both Qintong and Gaoyou pull-apart basins, Along both sides of the strike-slip faults are formed a series of structures, which are good places of oil and gas accumulation.
Based on the geological characteristics of Tianfu anticlinal structure，this article puts forward the problem oft deformation geometry of high angle underthrust. It quite systematically expounds the concepts of infinitesimal and finite decimal，continuity and uniformity involved in the deformatiom geometry analysing the oil geological structures, discusses Coulomb-Mohr theoretical expression, and analyses the variable range of shear angle(A)in deformation ellipsoid. Therefore，the theoretical basis is presented to demonstrate the high angle underthrust.
By using the combined implicit characteristic line method，the calculation of the transient surge pressure in the flow conduit of a drilling well has been resolved in this paper, The dynamic wave equation and the definite solution conditions of a compressive fluid in different flow conduits of elastic pipes in a well have also been derived.Different combinations of pipe-casing flow conduits in a drilling well are defined，and the numerical solution in each condition has been obtained Compared with the steady surge pressure calculation method, the transient method more closely coinsides with the actual hole condition，so that surge pressure and the rational velocity for pulling and running pipes be calculated more precisely by the method given here.
The bottom-hole assembly may be regarded as the continuous beam to which the axial force and the transverse force apply. This paper uses the elemental principle of least square method of weighted residuals compute the force on a multi--stabilized bottom hole assembly and to deflection，gives the theoretical formulas of computing the internal bending moments at stabilizer The side force on bit and the reactive force at stabilizer. In computing, this paper already considers the condition that the stabilizers are note in line.
The tests for the flow of a partially hydrolyzed polyacrylamide in three different sand packs have been conducted in this paper, The viscoelastic effect is found to exist not in compacted corundum sand cores sintered with aluminium phosphate but in quarts sand cores cemented by cement and epoxy resion, This phenomenon is believed to relate to the pore structure and permeability o} cores, For sand cores showing the viscoelastic effect，on the basis of Kelvin model，a mathematical model has been given for descibing the restoring deformation caused by polymer molecules rate fined in porous media. This model shows that pressure being stable，the change of flow rate with time accords with an exponential reaction when the cores are washed by the water until flow rate becomes constant and then the pressure is let to reduce. And the validity of this model is analyzed in this paper as well.
The basic principles and the up-to-date situation of CT Scan are briefly introduced here, The CT Scan has proved to be a rapid and useful method for observing pore structures in rocks, Moreover, it has been shown that the permeability measured by conventional methods is a little lower than the real one
On the basis of the generalized equation of unsteady flow(transient flow) in complex natural-gas pipelines，combined with the real conditions, this paper presents the mathematical models of gas transient flow in single loop pipeline networks and two-loop in parallel pipeline networks，and then applies the method of Laplace Transform, and after making a series of mathematical calculations, derives the formulas describing the laws of gas transient flow in gas loop pipeline networks, In order to make it possible to apply the formulas to production practice, computer programs are by compiled. Finally，real examples and their calculation results are given，which the pressure curves depending on pipe-length and time are drawn.
Based on the dynamic Von Karman-type equations governing the free flexural vibration of the shell，the weighted residual method is adopted in this paper to have obtained a new method for the free vibration analysis of the orthotropic circular cylindrical shell of laminated composite, The result obtained is in good agreement with that of Werner Soedal's method, In this paper，the method is applied to the numerical calculations and its validity is verified by comparing the natural frequencies in three types of pipes.
The tubing column subjected to weight and reaction forces of constraint applied by the packer and the wall of a well is usually in a multi-wave buckling state. This paper evaluates the maximum bending moment of the tubing, The evaluated value is two times as large as that obtained on the basis of the helical buckling model (Ref, 1). This paper presents the formula used to calculate the allowable packing force. It can be simply used in the design of the tubing selled with a packer.
This paper discusses the problem of concerned calculation of elastic foundation beams with combined axial and lateral -loads, By using Laplace transformation，the universal calculating equation about the problem is obtained, It can give a united description of infinite and finite; beams，and be suited to complex loads and all kinds of supporting conditions, If a proper change is made, it can also be used in the solution of beams whose flexural rigidity varies by steps on elastic foundation, When the axial force equals to zero, the formula becomes that of common elastic foundation beams, In this way, the calculation of the elastic foundation beam is further unified, which is very convenient to practical use. For its application, the simulation of elastic foundation beams by the approximate analysis of the shell structure is also discussed in the paper,
The transitional wear behavior of spheroidal graphite cast iron has been studied in this paper. The effect of load, speed, micro-structures and alloying elements vanadium and titanium on the transition between mild and severe wear of spheroidal graphite cast iron has been investigated, and the mechanism has also been discussed.
Taking Z-80 for example，this paper presents an algorithm which disassembles the object codes into mnemonics. By means of the graph, the issue of disassembling object code is transformed weighted-direct into travelling weighted-directed graph. Therefore，the instruction mnemonics and data area codes can be obtained easily and quickly, making the process of disassembling much shortened, Although the algorithm is developed for Z-80 machine in the paper, it is not difficult to extend it to other machine instructions.
This paper explores the optimal scheme problems of the distribution of crude oil production and investment by system engineering, and presence the ability model of oil fields and the program model of the Petroleum Ministry to meet the needs of national economy for crude oil. The present optimal scheme provides the scientific basis for the Petroleum Ministry in the distribution of oil output、 and fund among oil fields.
This paper has described the characteristics of neptunian dikes in Jian-shuigou reef com plex, studied their origin and the role in the process oftheir occurence, in particular, their relation to the dolomitization in theburial diagenetic stage. The existence of neptunian dikes is of great signi-ficance in the migration and accumulation of oil and gas，and other dia-genetic fluids.
