Journal of Southwest Petroleum University(Science & Technology Edition)

THE DESIGN AND MANUFACTURE OF THE WAVE-CARRIER TRANSMITTER FOR SEISMIC EXPLORATION

Zhao Yi-Jin Mi Qin-fang

1981, 3(3): 1-18. DOI: 10.3863/j.issn.1000-2634.1981.03.001

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The article describes the performances of the wave-carrier transmitter for seismic exploration which is designed and manufactured by us.The wave-carrier transmitter has following technical characteristics:(1) Linear level range in channels>90 decibels.(2) The number of channels is 30.(3) The interference between channels<10^-3.(4) It has high resistance to the interference of industrial electricity and the interference of other atmospherics.The article relates the technical approaches of realizing above mentioned aims and provides correlation records of lab analog experi-ment and field experiments.

RESEARCH ON THE LOSS OF HYDROSTATIC HEAD AND THE GAS COMMUNICATION CAUSED BY THE GELLING OF CEMENT SLURRY

Drilling Technology Teaching and Research Section

1981, 3(3): 19-30. DOI: 10.3863/j.issn.1000-2634.1981.03.002

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This paper is the study of the gas communication andthe loss of hyd rostatic head of cement column caused by the gelling of cement slurry in the case of simulating the changes of temperature and pressuse in the well bore. From the results of experiments, it has been proved to be true that the gas communication and the loss of hydrostatic head of cement column caused by the gelling of cement slurry are serious, and the loss of hydrostatic head of cement column caused by the gelling of cement slurry can be calculated quantatively after experimentation and mathematical analy-
This makes it possible that a sound basis is provided for taking tech-
nical measures to grevent oil，gas and water co-mmunication in the casingcementiag job.

CASSON MODEL SUITABLE FOR THE RHEOLOGIC PROPERTIES OF DRILLING FLUID

Liu Chong-jian

1981, 3(3): 31-40. DOI: 10.3863/j.issn.1000-2634.1981.03.003

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The main advantages of Casson Model are its strong suitability, its convenience in calculation, its high accuracy and its better capability of reflecting the rheologic laws of drilling fluid at different shear rates. The principal rheologic parameters in the model are closely related to the properties required by drilling fluid when it is in motion and at rest. Owing to the fact that the model was used in drilling fluid not long ago, there are no completely agreed opinions on it. Based on the articles published already, this paper gives diffcrent opinions on the basic meanimg and the calculating method of the rheologic parameters in Casson Model，and this is for reference only.Necessary descriptionsb are given of the ability of Casson Model to
carry cuttings and the degree of its shear thinning, and preliminary con-clasions are also arrived at

Sepiolite from Quanjiao County, Anhui Prov. China

Huang Ling-ji

1981, 3(3): 41-61. DOI: 10.3863/j.issn.1000-2634.1981.03.004

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Quanjiao County，Arihui prov .is .the only place in China where
occurs recoverable sepiolite and its outcrop.The results of the sepiolite
identified by using g means are presented and compared with those of
the sepiolite of other areas in the world.
The sample from the outcrop is an asbestiform fibrous mineral.It
has the first grade interference colors，and is biaxial pos.with 2V≌61°，
Ng=1 .5292，Nm=1.5214，Np=1.5186，max.birefringence p.010, and is
Ierigth pos. with parall.extinction.X-ray powder diffraction shows that
the specimen is well crystallized se,piolite.IR spectra exhibit I small but
distinct band at 3685 cm^-1，in addn.to 2 broad bands at 3560 and 3410
cm"t, with a shoulder at 3250 cm^-1， In the region 400-1300 cm^-1, the
samples exhibit I broad band at 1200-12 cm^-1;1, 3 very large bands near
1070, 1020 arid 975 cm^-1，3 broad bands at 780, 690(shoulder at 723)，
and 640 cm'1, and 1 large broad band at 465 (shoulder at 425) cm^-1.DTA
curves have a double endothermic peak at 125-150 C and 805-818 C，and
eridothe.rm-exotherm inversion at 740.℃·A them·anal，given is SiO₂ 52.4,MgO 22.01,H₂O(+)12.42,H₂O(-)6.88 and SiO₂/MgO 1.59, and.sug-
Bests the mol .formula H₆Mg₃Si₁₂O₃₀(OH)₁₀·6H₂O，The electron micro-
graph shows that the sample examined is a pure sepiolite.
The physical aad. chum.prop.，crystallized structure，origin and
main use's of sepiolite are also discussed.

ANALYSIS OF FORCE ON THE JOURNAL BEARINGS OF THE TRICONE BIT

Zhang Xian-pu Huang Chun-shen et al.

1981, 3(3): 62-71. DOI: 10.3863/j.issn.1000-2634.1981.03.005

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The characteristic features of an experimental bit are related.The experimental bit is the main equipment used in studying the
forces to which the journal bearings of the tricone bit are subjected.
The experi-mental bit is designed according to the basic parameters of
XHP215ZY-3 type bit produced by the Chengdu Petroleum General Machinery-Building Plant of The Sichuan Petroleum Industry Administration.Through
experiments a set of curves are recorded.The radial and axial loads on
the big and small journal bearings of each cone are obtained，and the
load distribution percentages on the cones and bearings are calculated.
The result of data processing has proved the design of the experimental
bit to be successful and the recorded curves of load variations with time
to be reliable.Meantime, the experiments concerning the influence of
vertical relative positions of cones on their bearing loads are described.
At the end of this paper, several opinions on the present design of this
type of bit are put forward.

A FLOWCHART USED TO CALCULATE STATICALLY DETERMINATE TRUSSES

Luo Zhi-jiu

1981, 3(3): 72-78. DOI: 10.3863/j.issn.1000-2634.1981.03.006

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Based on the equilibrium equation of force, a method of calculating trusses-a chart is presented in this paper, and some instances are given to show its applications.

ANOTHER ISOMORPHIC THEOREM ON FUZZY SUBGROUPS AND FUZZY SERIES OF INVARIANT SUBGROUPS

Shi Yong

1981, 3(3): 79-82. DOI: 10.3863/j.issn.1000-2634.1981.03.007

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Fuzzy groups presented by A. Rosenfeld in 1971 attracted great attention of the mathematicians at home and abroad. Wu Wang-min and Zhou Kai-qi et al. studied Fuzzy groups extensively and arrived at a lot of important conclusions. Following the homomorphic theorem and a few isomorphic theorems on. Fuzzy groups set up by Zhou Kai-qi, this paper presents another isomorphic theorem on Fuzzy subgroups for the purposes of discussing the relationship between Fuzzy groups and Fuzzy Subgroups.

PARTICULAR SOLUTION OF CAUCHY PROBLEM-ONE OF PARTIAL DIFFERENTIAL EQUATIONS

Wu Xiao-qing

1981, 3(3): 83-96. DOI: 10.3863/j.issn.1000-2634.1981.03.008

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A particular solution of Cauchy problem of the second order linear partial differential equation with constant coefficient is presented, and the problem contains the initial conditions (and the free term) belonging to the analytic function. And some applications of the formula to differential calculus are also discussed.

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