Table of Content

20 February 1984, Volume 6 Issue 1

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论文

A HYDRAULIC SIDE FORCE EXPERIMENT OF UNEQUAL-DIAMETER NOZZE CONFIGURATION

Drilling Technology Research Section

1984, 6(1):  1-10.  DOI: 10.3863/j.issn.1000-2634.1984.01.001

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This paper presents a method for the hydraulic force experiment of a jet bit. The result obtained shows that with three unequal-diameter nozzles, two nozzles or single nozzle being used, the value of the hydraulic side force on the bit is mainly dependent on the flow rate, the mud weight and the equivalent diameter of nozzles.

THE CALCULATION OF CASING CENTRALIZER SPACING

Wu Jiang

1984, 6(1):  11-22.  DOI: 10.3863/j.issn.1000-2634.1984.01.002

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Centralizing the casing string in borehole is the importantprerequisite for improving the cementing displacement efficiency. In this paper, the mechanical analyses of the casing strings with centralizers have been made respectively in the straight-inelined and the curved boreholes, and the boreholes crooked with changed azimuth. The action of hydraulic pressure in the borehole is pre cisely considered. Both the deflecton of the casing itself and the displacement of centralizers have been studied.

APPLICATION OF FRACTURE MECHANICS TO HYDRAULIC FRACTURING OF OIL AND GAS WELLS

Li Binyuan

1984, 6(1):  23-36.  DOI: 10.3863/j.issn.1000-2634.1984.01.003

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On the basis of the theory of two-dimensional elastic plate with holes, the use of the theory of linear elastic fracture mechanics in the hydraulic fracturing of oil and gas wells is discussed in this paper. The formulas for computing fracturing pressure of rocks have been obtained. A series of tests and field practices showed that the results calculated by these formulas are more approximate to the practice than those computed by the formulas used in the present petroleum engineering.

GENERAL SOLUTION OF CONTINUOUS BEAMS UNDER THE ACTION OF DIRECT COMPRESSION AND LATERAL LOAD

Yuan Xiangzhong Liang Zheng

1984, 6(1):  37-49.  DOI: 10.3863/j.issn.1000-2634.1984.01.004

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Based on the differential equation in bending, this paper discasses the continuous beams under the action of direct compression and lateral load, and presents the general solution of such a problem by using the method of Laplace transformation. This paper also deals with the lateral buckling of the beams compressed within the elastic limit, and presents the solution of the continuous beams within lateral load as a special example in passing. In order to prove the formulae obtained and assure the exactness of this method,some examples are given at the end of this paper.

HOW TO DETRMINE THE POSITION OF COMPRESSDR STATIONS OF THE GAS TRUNK LINE BY ANEIECTRONIC COMPUTER

Wang Yuchun

1984, 6(1):  50-60.  DOI: 10.3863/j.issn.1000-2634.1984.01.005

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Mainly discussed in this paper is how to determine the position of compressor stations of the gas trunk line with inflowing and outflowing branches in the relief area by means of an electronic computer. The calculating method presented in this paper is simpler and more convenient than the traditional one, and the result obtained is more accurate. The frame drawing of electronic computing is given in the paper for the quick grasp of it by the user.

ON THE ANALYTIC SOLUTION OF CAUCHY S PROBLEM OF EQUATION (a/(at)-r)~L U=□U+f(z,t)

Wu Xiaoqing Jiang Maoze

1984, 6(1):  61-68.  DOI: 10.3863/j.issn.1000-2634.1984.01.006

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We have given the analytic solution of Cauchy s problem of equation (a/at-r)~I U=□U+f(z,t)in this paper. The corresponding results in literature references[1] [2] [4] are nothing but particular examples in it.

A NEW COMPUTATION OF MATRIX INVERSION

Zhang Chungen

1984, 6(1):  69-73.  DOI: 10.3863/j.issn.1000-2634.1984.01.007

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This paper presents a new computation of matrix inversion. It gives out not only the programs but also applied examples.The resolution of A is A=LU, then A~(-I)=L~(-I)+(I-U) A~(-I),or, A~(-I)=U~(-1)+A~(-I)(I-L). when A is positive definite, the resolution of A is A=LDL~T, and then we have A~(-I)=D~(-I)L~(-I)+(I-L~T)A~(-1), or, A~(-I)=L~(-T)D~(-1)+A~(-1)A~(-1)(I-L~T). Compared with the litererature references[1], not only is the work load reduced, but also the stability of the computation is increased because of the reduction of division operation.