Table of Content

20 November 1989, Volume 11 Issue 4

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论文

ORIGIN OF PORES OF TIGHT SANDSTONE IN XUER SECTION, JIULONG MOUNTAIN AREA,SICHUAN BASIN, AND ITS SIGNIFICANCE IN EXPLORATION

Kang Yi-li Han Yao-wen

1989, 11(4):  1-15.  DOI: 10.3863/j.issn.1000-2634.1989.04.001

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The sandstone in Xuer section was mainly dominated by micropores. There were fewer feldspar and detritus solution pores and rare or no carbonate solution pores. This phenomenon has been explained by the steady carbon isotope of calcite and thermodynamics theory. The samples, the porosity of which is over 5%, must contain chlorite coatings and display high water saturation as well as low electric resistvity, which leads to mismisjudging gas an water layer. Detailed petrology researches show that clay minerals play a particular role in the process of diagenesis.The storage cap-acity of samples with clay is better than that with carbonate，.A new concept of“pore life-span”is proposed and its significance in petroleum exploration is discussed in this paper.


PRELIMINARY ANALYSIS OF ORIGIN OF HAI LUO DITCH GLACIER

Xu Zi-niu

1989, 11(4):  16-24.  DOI: 10.3863/j.issn.1000-2634.1989.04.002

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Gongga mountain area has developed 71 glaciers, five of which are longer than 5 kilometers, Hai Luo ditch glacier is the largest in scale and the lowest in elevation in Gongga mountain area. According to its distribution, shape and scale, theglacier is a mountain glacier. But it belongs to the dynamic metamorphic glacier by its origih.
Hai Luo ditch glacier formed about 1600 years ago on the east edge of Qinghai-Xizang plateau In its longitudinal direction, neve basin stands above, but glacier tongue stretches low. Between them the peculiar big high- hanging glacier cascades connect with each other.The formation and existence of glaciers were mainly concerned with the orogenic movement in recent periods，and with the geological background of north-southern tectonic mountain system of Gongga mountain，the natural regional geographical environment，the north-southern Hengduan mountain system in the south and the influence of southeastern seasonal wind on the southern sea region.Hai Luo ditch glacier is now in the strong melting and flinehing period，which is concerned with regional climate oscilation changes within scores of years，and in not concerned with“Greenhouse effect”.The scenes of the glacier don’t disappear in the predictable period because of flinching.


SEDIMENTARY MARGINS AND BY-PASS MARGINS: ANCIENT EXAMPLE AND FEATURE OF CARBONATE CONTINENTAL SLOPE

Mn Shu-guang Hou Fang-hao Fang Shao-xian

1989, 11(4):  25-31.  DOI: 10.3863/j.issn.1000-2634.1989.04.003

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The continental slope is the key zone connecting the shallow platform and the deep basin. It is of the feature of thick slope margin sediments including huge rock blocks. There was active carbonate continental slope sedimentation in the Middle Triaassic in south Guizhou, and according to their characteristics, the slopes could be divide into sedimentary margins and bypass margins. They were chiefly controlled by violent and non-uniform faulting. On different slopes there were obvious differences between the signs of the sedimentation.

APPLICATION OF RFT DATA AND ERROR RECTIFICATION

Zhang Mei

1989, 11(4):  32-46.  DOI: 10.3863/j.issn.1000-2634.1989.04.004

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The Repeat Formation Testor (hereinafter referred to as RFT) was introduced into our country from overseas markets at the end of 70 s and early in 80 s. Since then RFT data have been widely used by quite a few oil fields from day to day,and it is obvious that more thoroughgoing, perfect and precise explanations for these data are undoubtedly required.
Referring to some related articles published by both domestic and foreign specialists in recent years, this paper mainly introduces the application of RFT data to the cvaluation of oil (gas) reservoirs based on the principle of RFT as well as the basic theory for data explanations.The emphasis is placed on the introduction to the explanation of RFT data，the error analysis and the new method of rectification for measured formation pressures.In this way，we may define fluid properties and various fiuid contacts within reservoirs both recisely and reliably in order to provide a powerful scientific basis for distinguishing oil(gas) reservoir types and calculating their reserves.


APPLICATION OF QUANTIFIED THEORY I TO THE CALCULATION OF CIRCULATING PRESSURE DURING DRILLING

Liu Hui-xing Feng Shen-li

1989, 11(4):  47-55.  DOI: 10.3863/j.issn.1000-2634.1989.04.005

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On the basis of the principle and method of the quantified theory Ⅰ, the influence of quantitative and qualitative variables on the circulating pressure of drilling fluids is analysed. The quantified model of calculation of the pressure is set up through the treatment of 54 groups of drilling data in 5 wells. The model ean quantitatively analyse the effect of qualititative variables (such as mud types) on the circulating pressure. And the model has also better caleulating precision to remedy the defects of theoretical calculating method.

SYSTEM ANALYSIS AND SCIENTIFIC MANAGEMENT OF DRILLING & EXPLORATION OF DEEP WELLS

Zhang Chang-yuan Zhang Yao-shi

1989, 11(4):  56-62.  DOI: 10.3863/j.issn.1000-2634.1989.04.006

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The management method of drilling & exploration of deep wells in our oil fields is analysed and discussed in this paper Different contracting methods, which are now being implemented both in China and abroad, have been systematically introduced and evaluated. The scientific management methods of drilling & explration of deep wells arc preliminarily approached, and the management modes have been established in this paper.

A NUMERICAL METHOD FOR CALCULATING BOTTOM-HOLE PRESSURES IN GAS WELLS

Li Ying-chuan

1989, 11(4):  63-69.  DOI: 10.3863/j.issn.1000-2634.1989.04.007

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A numerical method is applied to calculate bottom-hole felow/static pressure in gas wells. The solutions of several practical examples are given and compared with other available methods.

A METHOD OF ANALYSING SHORT BUILDUP DATA AFTER LONGTIME PRODUCTION IN FINITE RESERVOIR

Li Zhi-ping Zhao Bi-rong

1989, 11(4):  70-80.  DOI: 10.3863/j.issn.1000-2634.1989.04.008

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This paper presents a method of analysing short buildup data after longtime production in a well inside a finite reservoir with any shapes. The basic theory of the method is different from both traditional Horner method and Modern type curve analysis method. It is derived from considering the actual flow conditions in the reservoir before shut-in. Therefore, ther esults of analysing short buildup data by this method coinside more closely with actual values. Its validity is verified through analysing short b buildup data after longtime production in the finite reservoir in situ.

RESEARCH OF OPTIMIZATION METHOD OF OIL AND GAS FIELD DEVELOPMENT SCHEME

Xu Jia-qiong Li Guang-yao

1989, 11(4):  81-88.  DOI: 10.3863/j.issn.1000-2634.1989.04.009

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In this paper, fuzzy integral appraisal and grey situation decision have been set up in the optimization of oil and gas field development scheme, we have paid full attention to the satisfaction degrees of various technology and economy targets, and applied this two methods to the economy appraisal of a gas deposit. The results obtained by the two methods are in agreement with the actual ones. It clearly shows that the grey system theory and fuzzy integral method can be successfully used in the economy appraisal of oil and gas field development scheme.


A NFW METHOD OF DETERMINING MODAL DAMPINGRATIO OF IMULTDEGREE-OF-FREEDOM STRUCTURE

Zhang Mao Chen Liang-hao

1989, 11(4):  89-97.  DOI: 10.3863/j.issn.1000-2634.1989.04.010

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In this paper, the method of determining damping ratio by comparing MEM spectrum is discussed and the shortcoming of this method is pointed out. Then a new method for determining damping ratio is proposed. The theory and algorithm of this method arc introduced. The results of simulation and practical computation of vibration signals show that the proposed method is efficient and accurate. In this paper the order choosing of autoregressive model is also discussed. A new criterion based on AIC is put forward, in which the influence of signal noise is considered.practical applications show that the criterion is applicable to various SNR situationr.

STUDY OF PRINCIPLE OF SELF-CENTERING OF SELF-CENTERING SHALE SHAKER

Li Jun-yu

1989, 11(4):  98-103.  DOI: 10.3863/j.issn.1000-2634.1989.04.011

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As the shale shaker whose locus of every point of the shale shaker s frame is a circle is steadily working, there is the only instantaneous centreline of velocity on the vibrating shaft, and its position is fixed. The instantaneous centreine of velocity is situated between the centerline of vibrating shaft and the centroid of the eccentric pieces, and its distance to the centreline of the vibrating shaft is equal to the amplitude of the shale shaker. Provided the geometric centre of the rubber belt pully is mounted on the instantaneous centreline of velocity，the rubber belt pully only rotate around the fixed axis，and doesn’t vibrate with the shale shaker frame.

A CORRECTING METHOD ON GEAR DRIVE CALCULATION

Fu Cang-yi Mei Yun-xin

1989, 11(4):  104-108.  DOI: 10.3863/j.issn.1000-2634.1989.04.012

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A simple and convenient correction formula is presented in this paper by using calculated value and permissible value of contact stress and flexural stress obtained through the corrected calculation of strength under initial definite geometric parameters of the gear. The complicated and long process of approximation calculation of many times of combinations of geometric parameters and corresponding calculation can be avoided and an accurate enough result can be obtained by using this formula. The formula may be regarded as the important complementation for ISO calculating standard of gear strength.




STUDY OF VIBRATION AND STABILITY OF FLUIDCONVEYING PIPES

Meng Tian-hui

1989, 11(4):  109-116.  DOI: 10.3863/j.issn.1000-2634.1989.04.013

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This paper theoretically discusses the vibration of fluid induced pipes with axial drive in the range of elastic properties, and derives an equation which decides the vibration frequency of fluidconveying pipes. This paper also investigates the effect of fluid and axial force on the vibration and stability of flowing pipes, and obtains a theoretical formula of deciding the critical pressure and velocity.

ACIDIZING OIL AND GAS WELL OF GYPSUM-CONTAINING FORMATION

Yan Xing

1989, 11(4):  117-121.  DOI: 10.3863/j.issn.1000-2634.1989.04.014

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Gypsum can dissolve in hydrochloric acid when gypsum-containing formation is acidized. During the acidizing operation, the concentration of acid solution decreases and the concentration of calcium chloride increases, the secondary precipitation of the gypsum appears. In this paper, we discuss the secondary precipitation of the gypsum by the solubilities of the gypsum in hydrochloric acid and calcium chloride solution and in spent acid during acid treatment. We also propose the methods of its prevention.