Journal of Southwest Petroleum University(Science & Technology Edition)

EXPERIMENTAL TESEARCH INTO THE BORIDING OF THE JOURNAL BEARING OF THE CONE BIT

SU Mei-rong QI Shu-min PEN Qi-mei

1982, 4(4): 1-12. DOI: 10.3863/j.issn.1000-2634.1982.04.001

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In this paper we introduce two groups of compounds for boriding,in which there is no B4C.When the journal bearing of the cone bit is borided in this way,a less brittle single phase Fe2B layer is obtained.
In the second part of the paper we show some experiment results of several wear couples.Besides,we piont out that it is possible to substitute the borided ipening rfo that made up of silver-manganese alloy and that the wear couple of the borided opening and the journal neck of the bit leg made of wear-resieting alloy works very well.

EXPERIMENTAL RESEARCH INTO ROBERTSON—STIFF MODEL

1982, 4(4): 13-26. DOI: 10.3863/j.issn.1000-2634.1982.04.002

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This paper has briefly described the use of the pipe-line viscosimeter and developed a formula of calculating rheologci parameters on the basis of the pipe-line data.Through analysis of experimental data,we have proved that ROBERTSON—STIFF MODEL has advantages of great adaptability and high accuracy.

A SET OF PROGRAMS FOR THE OPTIMIZING HYDRAULIC FACTORS OF JET DRILLING

LIU Hui-xin

1982, 4(4): 27-37. DOI: 10.3863/j.issn.1000-2634.1982.04.003

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The electronic computer is coming into wide use in drilling technique.This article presents a set of programs for the optimizing hydraulic factors of jet drilling.By means of comparision between our results and those obtained by figuring method,we have proved that oru method is available.

THE CHANGE LAW OF THE EFFFECTIVE MASS TRANSFER COEFFICIENT OF THE HYDROGEN ION IN ACID TREATMENTS

LI Lian-kui Yuan zi-guang Ren Shu-quan

1982, 4(4): 38-51. DOI: 10.3863/j.issn.1000-2634.1982.04.004

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The effective distance of acid penetration along a fractrue is an important parameter for acid fracturing design and treatment.
With the help of mathematical statistics an experience equation expressing dimentionless telation of them has been obtained.This distance may be also estimates by superposing the results of calculating section by section.

ANALYSIS OF THE MECHANSIM OF THE SEAL FAILURE OF DRILLING PUMPS

PENG Sheng-nan JIAO Shi-quan

1982, 4(4): 52-59. DOI: 10.3863/j.issn.1000-2634.1982.04.005

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After briefly explaining the work of the drilling pump,we made an analysis of the propertise,mechanism and the major influencing factors of the seal failure of drilling pumps.In order to prevent the seal from failing we suggestes improving the lubricity of the drilling fluid,perfrcting the cleaning system,comtrolling the clearance between the piston and the liner and taking some preventive measures.

ANALYSIS OF STRESSES NEAR TIPS OF A CRACK IN A CYLINDRICAL SHELL UNDER INSIDE PRESSURE

LIN Shao-dong

1982, 4(4): 60-74. DOI: 10.3863/j.issn.1000-2634.1982.04.006

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The problem of cracking of cylindrical shells,especially when under inside pressure,appears very important.Many examples shou that it is the crack extension that causes the damage the vessels.Our results completely agree with those that are obtained by Folias with the help of the integral equation

ANALYTIC AND BASIC SOLUTIONS OF CAUCHY PROBLEM OF THE PARTIAL DIFFERENTIAL EQUATIONS

WU Xiao-qing

1982, 4(4): 75-88. DOI: 10.3863/j.issn.1000-2634.1982.04.007

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In this paper we have disscussed Cauchy problem of the equations type.We have given an operator series formula for solution of problems of this type and solved some extended Cauchy problem according to this formula.

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