Journal of Southwest Petroleum University(Science & Technology Edition)

TYPES AND CHARACTERISTICS OF NON-TECTONIC OIL-GAS POOLS IN CHINA

yan Qi-bing

1987, 9(3): 1-9. DOI: 10.3863/j.issn.1000-2634.1987.03.001

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On the basis of trap types, and according to the genesisgical feature of traps, non-tectonic oil-gas pools in China and m orpholo-can be dividedinto four major types(depositional，diagenetic, h川rodynamic, and hybrid type)，four subtypes and ten tiny types.The concept and the basic char-
acteristics of every type are discussed，some examples are given and a new
approach is made to the traditional classification methods in this paper.

ANALYSIS OF STACK EFFECT OF DIFFRACTED WAVES

Cao Tong-ren

1987, 9(3): 10-15. DOI: 10.3863/j.issn.1000-2634.1987.03.002

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By studying the relations between the time graphs of the diffracted wave
and the reflective wave as well as the characteristics before and after the
NMO of the diffracted waves，e m phasis is laid on the discussion of the
reason why the largest graphs diffracted wave amplitudes occur in the top of the diffracted wave to and why the amplitudes attenuated at great speed
occurin the tails of the diffracted wave graphs to in the horizontal stack
section, when the seismic line is normal to a fault edge in the case of
the sa m e buried depths h of the diffracted point and different values L(the
distance from the shotpoint to the projection point of the diffracted point
on the surface.)

TRACER METHOD OF SATURATION DETERMINATION IN MEASURING RELATIVE PERNMEABILITIESIN A STEADY一STATE

He Geng-sheng

1987, 9(3): 16-23. DOI: 10.3863/j.issn.1000-2634.1987.03.003

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Relative pelrtieabilities, which are one of the necessary funda mental data，
have widely been, used in reservoir evaluation and calculation under dyn-
amic conditions.In measuring relative permeabilities in a steady一state，a
very difficult problem to solve is how to determine fluid saturations
According to author's practice.it has been discussed in this paper how to
determine fluid saturations by using the data of tracer concentrations

STUDY OF STABILITY OF FOAM ACID

Chen Gen-qiang Zhang Xi YuanMing-dong

1987, 9(3): 24-30. DOI: 10.3863/j.issn.1000-2634.1987.03.007

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The effect of the co-compounding ingredients of foamer，polymer and
alcohol，the concentration of acid and temperature on .foaming ability and
stability of foam acid has been studied in this paper.The research shows
that some co-compounding ingredients of foamer are good foaming system.
It can be concluded from laboratory tests that proper alcohol and polymer
cpzi enhance the stability of foam acid，

AIR POLLUTION OF BENZO-a-PYRENE IN AEROSOL IN SOUTHWESTERN PETROLEUM INSTITUTE

Feng yu-hui Deng Ming-yin Zhou Chang-de Shang yun-he

1987, 9(3): 31-35. DOI: 10.3863/j.issn.1000-2634.1987.03.005

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Some analysis results of benzoa pyrene in aerosol are reported in this
.paper.The samples are collected from four monitoring positions in the
Southwestern Petroleum Instittute in winter, 1986.(About aerosol，there are different definitions in different countries.The concept of aerosol used in this paper is the same as that in West European, and it is very
popular in Chinese scientific literatures.) Such contaminants as SO2，NOx,pb and aerosol in air and their pollution characters in the monitoring area are discussed, and a reasonable evaluation is given for the air poll-ution in that Institute.

DEVELOPMENT OF DRILL GRINDING DEVICE

Wangpa-wei Chen Liang-hao

1987, 9(3): 36-45. DOI: 10.3863/j.issn.1000-2634.1987.03.006

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The construction and working process of a newly-developed drill
grinding device are described in detail in this paper.Data necessary for
drill set-up are listed.Pictures of drills ground on this device prove its
satisfactory performance.Improvement is expected to be made in accurate
workpiece positioning during set-up.

OPTIMUM MATCH OF PRIME MOTOR USED IN WORKOVER RIG WITH HYDRAULICTORQUE CONVERTER

Wang Cao-jin

1987, 9(3): 46-52. DOI: 10.3863/j.issn.1000-2634.1987.03.007

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The match of prime motors with hydraulic torque converters is one of
the more important problems in drive system design for workover rigs.
whether thematch is correct or not directly decides the workiag per-formance and economic property of workover rigs.The . match calculation by the diagramatie method is more complex, Especially, it is most diffi-cult to select an optimum match among so many torque converters for a prirae motor.Therefore,the problem of optimum. match among all torque converters being able to be selected for a known motor is discussed in this paper.Basic assessment parameters.for match nature are analysed，a weighted synthetic assessment index is presented，and the computer prog-ram for the optimum match design is compiled.The program is written in Basic Language，and is very simple and useful .An example is calculated in this paper.

A METHOD TO DETERMINE THE FIRST CRITICAL VELOCITY OF, FLUID!N A PIPE SUPPORTED AT ITS TWO ENDS

Liu Chao-tang

1987, 9(3): 53-56. DOI: 10.3863/j.issn.1000-2634.1987.03.008

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The critical velocity of fluid in a pipe supported at its two ends can
be obtained by solving the partial differential equation of the pipe's late-
ralibration .By analysing the relation of energy to the pipe's divergent
instability,a unified form ula for the velocity has been derived.The results
obtained by the formula are very close to those got by other formulas.

STUDY OF MODEL IN SYSTEM DYNAMICS IN CRUDE OIL PRODUCTION

Li Guang-yao

1987, 9(3): 57-61. DOI: 10.3863/j.issn.1000-2634.1987.03.009

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The causal relation diagram and flow diagram in system dynamics
are presented from the point of view of economics in the crude oil
production.It would be beneficial to the system simulation and middle
or long period programme .This model can be suitable for national or regional programme.

AN IDENTIFICATION PROBLEM OF THE DISTRIBUTED PARAMETER SYSTEM WITH POINT OBSERVATION

Peng Liang-yi Liu Kang-sheng

1987, 9(3): 62-71. DOI: 10.3863/j.issn.1000-2634.1987.03.010

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This paper discusses identifiability of the initial state of one vibrating
string with viscous damping at end point，where the velocity at this po-
int is observed.An abstract semigroup approach is used here .It has been
proved that the system is a spectral system，and the identifiability depends
completely on the measurement of the observation time interval
In addition，the classical solution to the initial-boundary value problem is
obtained under certain assumption of the initial value.

ANALYSIS OF OUT一OF-WORK BEARING SYSTEM OF CONE BITS

Wang Zi-Yu Pen Qi-mei Su Mei-rong Qi shu-ming

1987, 9(3): 72-86. DOI: 10.3863/j.issn.1000-2634.1987.03.011

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Through analyses of a batch of out-of-work bearings of XHP2S, XHP,
tricone bits，including macroscopic analysis，m etallurgical analysis，iron
spectrum analysis and scanning electron microscope analysis，this paper
points out that' the wear mechanism of bearings of this kind of bit is sep-
arating layer wear，fatigue wear, adhesion wear and grinding wear, etc，
Among them，separating layer wear and fatigue wear are basic ons，whe-
reas adhesion，abrasion, oxidation and corrosion occur at the later period
of wear

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