Journal of Southwest Petroleum University(Science & Technology Edition)

STUDY OF LOG FORMULA BANK

Chen Fu-xuan Xia Hong-quan Liu Xiang-jun

1992, 14(3): 1-8. DOI: 10.3863/j.issn.1000-2634.1992.03.001

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Log formula bank is a kind of information storage based on the for-
mulation knowledge of well log interpretation, To create the bank is mainly
to collect all kinds of log interpretation models, formulas and parameters
that have been presented so far, and to provide computer choice and appli-
cation for well log interpretation.This paper further studied the log formula
bank and developed a set of microcomputer software, The log formula bank
system includes four main banks, fifty-two sub-banks, and nine main
program blocks, The practical application showed that the structure of the
log formula bank is reasonable, its function is perfect and complete, It can
store a great deal of formulation information and work as an important
auxiliary means for well log interpretation,

PROBLEMS IN DETERMINING OIL/GAS一BEARING AREA AND ITS CORRECT METHODS

Leo Ming-gao

1992, 14(3): 9-13. DOI: 10.3863/j.issn.1000-2634.1992.03.002

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The definition of oil/gas-bearing area given in traditional petroleum
geology theory was taken objection against in this paper, The problem exists
especially in the reservoirs of overturned fold，and of fault footwall，and in
the reservoir under unconformity surface, The oil/gas-bearing areas deter-
mined by traditional methods are smaller than the actual areas, The size of
the reduced area depends on the attitudes of overturned limb of fold or fault
or unconformity surface, the, thickness of the reservoir bed and its attitude,
A more logical definition is given in this paper, The oil/gas-bearing area
should be the projected area of oil/gas-bearing body on the horizontal plane,
Three correct methods of determining the area are recommended here,

NEW ALGORITHMS OF DECONVOLUTION BY USING DFT

Yi Zong-f u Lei Xiao

1992, 14(3): 14-19. DOI: 10.3863/j.issn.1000-2634.1992.03.003

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When X(k) is at zeros, it is difficult to solve H(k) in deconvolution by using DFT technique, This problem can be solved by using GFT technique,Based on DFT technique, two fast algorithms are proposed to solve the problem that X(k) is at zeros.

PRINCIPLE AND ALGORITHM FOR FINDING GRID POINT VALUESOF A GRIDING ON A CONTOUR

Xu Hua Ge Jia-li Li Shi-lun

1992, 14(3): 20-26. DOI: 10.3863/j.issn.1000-2634.1992.03.004

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Based on the principle of digital image processing, an algorithm finding the grid point values of a griding on a contour is proposed in this paper, It is actually an inverse problem of the existing contour plottingproblem based on the given grid point values, The principle. and algorithm ofsolving the problem are discussed in detail, An example is given and somemain uses of the algorithm is introduced.

STUDY OF LOST CIRCULATION LAW IN CREYICED FORMATION

Du Chun-chang Liu Wen-zhong

1992, 14(3): 27-34. DOI: 10.3863/j.issn.1000-2634.1992.03.005

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According to the properties of lost circulation in the creviced formation
this paper presented a mathematical model of the lost circulation law, It is
from this mathematical model that the flow Iaw of various fluids is derived.
On the basis of the flow law, the relation between leakoff velocity or leak-
off rate and pressure difference, crevice sizes and rheological properties of
drilling fluids can be quantitatively analyzed and calculated，It is of great
guiding significance to optimizing the plugging materials of lost circulation
and reasonable plugging methods, and to improving the lost circulation
effectively in the drilling process,

ACCURATE SOLUTION FOR VARIABLE一RATE CASE WITH WELLBORESTORAGE AND SKIN EFFECTS

Li Shun-chu Huang Bing-guang Zhou Rong-hui

1992, 14(3): 35-42. DOI: 10.3863/j.issn.1000-2634.1992.03.006

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Using a new point of view that assumes the drawdown this paper provides a mathematical model distribution of variable-rate case of a
single-well system in infinite, isotropic and skin effects into consideration The formation, taking wellbore storage model gives an accurate slution to the change in bottom-hole pressure, using Laplace's analytical
transform method，and gives its dimensionless form so as to draw a typical curve for well-test analysis easily in practice.This paper also briefly presents the method of applying the accurate analytical solution.

LAMINAR FLOV6} OF BINGAM' S FLUID IN INCLINED ECCENTRIC ANNULUS

Zheng Yong-gang

1992, 14(3): 43-54. DOI: 10.3863/j.issn.1000-2634.1992.03.007

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Using the differential motion equation in fluid mechanics, this paper
developed the flow models of the laminar flow of Bingham's fluid in an
inclined eccentric annulus.By solving the differential equation，it presented
the accurate flow velocity distribution，formulas of Bingham's fluid under
flow conditions and analyzed the flow features of Bingham's fluid laminar
in an inclined eccentric annulus, It has been proved that when flow velocity
in the annulus is higher, i.e, when the rate between Bingham's fluid yield
value and the gradient of pressure are less, the maximum velocity."radius"
of Bingham's fluid laminar flow approximates to that of Newton's, This
paper also analyzed the error produced therefrom, The results showed that
when the ratio between the yield value and the gradient of pressure is not
larger than 0.Olm, the relative error is less than 1.270,6;and lastly the
paper also proposed the accurate flow rate and pressure fall formulas bf
Bingham's laminar flow under flow conditions,

STEP ANGLE DIFFERENTIAL TECHNOLOGY OF STEP MOTOR IN HIGH-TEMPERATURE AND HIGH-PRESSURE ROTATIONAL VISCOMETER-FILTRATION TESTER

Cao Xie-dong

1992, 14(3): 55-59. DOI: 10.3863/j.issn.1000-2634.1992.03.008

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This paper laid emphasis on discussing the seep angle differential tech-nolgy of step motor in recently developed high-temperature and high-pressure rotational viscometer-filtration tester, This technology can be used to solve the problem of measuring precision at low rotational velocity,

ANALYSIS OF VALVE OF ADVANCED FRACTURING PUMP

Luo An-xian Qi Shu-min Yang Qi-ming

1992, 14(3): 60-67. DOI: 10.3863/j.issn.1000-2634.1992.03.009

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The fraeturing PumP is the Key equiPment used infraetureaeidizing
technique to enhanee 0il-gas recovery.Under the severe oPerating conditions，the life of its quick-wear Parts，valves，is too short to accomPlish one run (about 2.5 hours).In order to enhance their life，the authors collected valves of advaneed Pumps，and analyzed their material and metallurgy maeroseoPieally and microseoPieally for failure，and obtained some benefieial knlowledge of enhancing the life of valves，which can meet the satisfaetory need of fraeture-aeidizing technique.

DYNAMIC ANALYSIS AND MECHANICAL EFFICIENCY CALCULATION OF DRILLING PUMP IN CONSIDERATION OF FRICTION

Zeng Guang-xi Wang Wei

1992, 14(3): 68-75. DOI: 10.3863/j.issn.1000-2634.1992.03.010

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The paper expounds characteristics and means of dynamic analysis of
drilling pumps in consideration of friction.Mechanical efficiency and its
theoretical calculation method are studied，which are commonly used to a
certain degree.An example of the triplex drilling pump calculated，the
efficiency, friction power in all pairs and mechanical efficiency of pump are
worked out.

NO-BEAM PUMPING UNIT AND ITS PUMP EFFICIENCY

Lu Rui-dian

1992, 14(3): 76-81. DOI: 10.3863/j.issn.1000-2634.1992.03.011

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There are many factors which affect the pump efficiency.Based on the
features such as long stroke and low speed of a no一beam pumping unit，this paper analyzes its pump efficiency.It is concluded that the pump efficiency of a no一beam pumping unit is higher than that of a beam pumping unit.

RELATIOIVS}IIP BET}vVEEN ADIABATIC EXPANSION AND EXTRACTION OF LIQUID HYDROCARBON FROM GAS

Zhang Yu-fang

1992, 14(3): 82-86. DOI: 10.3863/j.issn.1000-2634.1992.03.012

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This paper expounded refrigeration principles of isoenthalpic or isoentrupic
adiabatic expansion, and discuss:d the relationship and applicable conditions
of various expansion refrigeration elements designed according to these two
expansion principles in extracting liquid hydrocarbon from gas.

EFFECT OF LC RETARIDER ON STRENGTH OF CEMENT AT HIGH TEMPERATURE

Chen da-jun

1992, 14(3): 87-93. DOI: 10.3863/j.issn.1000-2634.1992.03.013

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This paper proposed the reasonable amount and the temperature of
adding silica flour after studying the strength retrogression of Romania
Sz oil cement at high temperature.The compound LC retarder added to the
slurry successfully retards the strength retrogression of cement and obvio-
usly improves the compressive strength of cement with silica flour.Its
thickening time and theology satisfy the requirement of 4000-5500m job.
This paper also analyzed the mechanism of LC raising the strength of
cement

HCHO AND LGV TYPE CHRME FREE LIGNOSIJLFONATE TIHINNER

Zhang Li-ming

1992, 14(3): 94-102. DOI: 10.3863/j.issn.1000-2634.1992.03.014

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HCHO was introduced as the cross一linking agent when LGV type chrome-
free lignosulfonate thinner was synthesized.The cross一linking function of
HCHO，the relationship among the dosage of HCHO and the intrinsic vis-
cosity，the adsorption，salt-resistant and the thinning properties of LG V
sample were examined by means of infrared spectroscopy, scanning elec-
tronic microscopy，viscosity, precipitate，adsorption and mud experiments.
The results showed that HCHO had the crosslinking function and affected
the adsorption，hydration and thinning properties of LG V sample by ma-
inly affecting the average molecular weight.Therefore，it is necessary to
control and adjust the dosage of HCHO.

OPTIMALITY CONDIONS AND DUALITYTHEOREMS OF A CLASS OF NONDIFFERENTIABLE MULTIOBJECTiYE PROGRAMMING

Zhang Ji-jun

1992, 14(3): 103-110. DOI: 10.3863/j.issn.1000-2634.1992.03.015

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This paper discussed a class of nondifferential multiobjective progr-amming problem，each goal function of which is a sum of differentiable function and a square root of quadratic forms.Under conditions of convex, the author established optimality conditions and weak, strong, and conversa duality theorems.

ANALYTICAL SOLUTION OF TWO MODELS OF QUASILINEAR .SYSTEMOF PARTIAL DIFFERENTIAL EQUATIONS

Wu Xiao-qing Huang Sen-nan

1992, 14(3): 111-117. DOI: 10.3863/j.issn.1000-2634.1992.03.016

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In theoretical study of acidization of sandstone rocks，Lund and Fogley
developed two models, which are marked by the quasilinear system of
partial differential equations.This paper gives out the analytical solution
for the quasilinear system of partial differential equations,

A COLLOCATION METHOD OF TERTIARY SPLINE FUNCTIONS FOR FREDHOLM INTEGRO DIFFERENTIAL EQUATIONS WITH WEAK SINGULAR KLRNELS

Feng We-isen

1992, 14(3): 118-126. DOI: 10.3863/j.issn.1000-2634.1992.03.017

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This paper presents a new cubic basic basic spline collocation method
For one order non-linear Fredholm integro-differential ,equations with weak
singular kernels.The author obtained an error estimate of collocation so-
lution and equation solution from theorem I and tneot'em II

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