The main nature-gas reservoir is carbonate rock in Guizhou Chishui region. Whether the reservoir is good or not directly is influenced By the crack growth situation in the carberpate rock layer. Drilling detection shows that where's the crack develops, there"s the advantage segmentation of nature-gas res-ervoir. This article uses stcveture analysis method to systemati-cally research the structural feature of Chishui region, and confirm the relationship between structure and crack，-discuss the cracks increased period and times, character,distribution state and distribution realm in this region, which lightens the orienta-lion for further nature-gas exploration.
Well Degu 2 is located in construction of Bixue Dian in Dezhou sag of Linqing expression，Shengli oilfield. Analysis of inclusion show that the time which oil&gas enter into trap of well Degu 2 is at the period of sedimentation in Shashan Member-Guantao Formation. Analysis of gas component show that oil&gas begin to migration in the period of low mature and mature for source rock, and accumulate to trap of well Degu 2. Gas in hydrocarbon is mainly from the crack gas of early kerogen in Ⅲtype kerogen. The character of coal-genetic gas is low mature based on the analysis of carbon isotope in gas. Maturity of gas is about 0. 8% so on. Reservoir in Carboniferouse-Permian and Ordovician is bad, coal-bearing seam in Carbonniferouse-Permian have a poor capacity of hydrocarbon-generating, poor capacity of hydrocarbon-generating and migration of Carbonifer-ouse-Permian is mainly reason of failure for the exploration well Dey 2.
Under the production of the gas condensate depletion, con-densate oil began to buildup at the bottomhole and gradually formed the high saturated region, led to the relative permeability and absolute permeability dropping, and the productivity of the gas condensate was influenced. The pseudopressure product in she equation of two phase fluid index of the oil and gas conden-sate was divided into the product of the two integral functions, one product function related to the physics properties of the high pressure, the other production function related to the effective permeability. Based on the study of the paper, the pseudo ef-fective permeability with the transient pressure determined with test well data was presented, and obtained the real pseudopres-sure and IPR for the gas condensate well.
In this paper, a moving-boundary problem occurring under the acidifying was discussed, which was transformed into a coupled piroblem of an initial-boundary value problem of nonlinear parabolic equation and an initial value problem of di13'erential equation. Then, the full discrete scheme was given.
Thermal-weightlessness is utilized to determine the type boundary line and relative content of bound water on montmoril-lonite and the results of isothermal adsorption have been tom-pared. The results show that each water relative content and total water mass on hydro-montmorillonite场the method are incon-sistent to them by isothermal adsorption. Thermal weight loss a-nalysis ( 25~250`0)results show that water on hydro-mont-morillonite is free water, loose bound water and sirong bound water which respectively corresponding to the water loss in 25-75oC，75~120oC，and 120~230oC.According to thermal-weightlessness regularity(25~250oC)，it also has two clear turning points which are plp。p/ps=0.9~0.98，the two turning points are the-special humidity of clay一water system. The rela-five vapor pressure 0. 9 is the boundary line between the strong bound water and the loge bound water(osmotic bound water ) on clays, the relative vapor pressure 0. 98 is the boundary line between the loge bound water and free water on clays. The method verifies the "two special humidity" by isothermal adso p-lion and the boundary line of bound water on clays.
Used self-designed HTHP core filtration simple apparatus, similarly simulated borehole conditions to form mud cake,and examined shear cementing strength between~and cement slurry iwnot cleaning, cleaning, clearing and cleaning condilions. Moreover, used metal stick to simulate casing and didcorresponding experiment. The result was shown that the effect of the wettability of drilling fluid on cementing strength of I and II interfaces in cementing job was enormous; compered to wate-base drilling fluid, the interface cementing sirenformedfrom oil-base drilling fluid decreased by 15%.Consequently ,it is very necessary to use wettahility reversal agent when designing pad fluid.
The mathematical models about the optimal operation of natural gas pipeline network were described, including two kinds of objective functions; one is about maximum return and the other is about maximum flow of pipeline network as well as eight constraint conditions. Three optimized algorithms(linearization optimized algorithm, complex optimized algorithm and feasibledirection optimized aigorithm) to resolve that models through researching kinds of classic optimized algorithms were determined,and the application program was written. These three optimized algorithms were analyzed and compounded, and the result showed the difference of these three optimized algorithm means's result was about i%.The example showed the linearization optimined algorithm possesses faster searching speed, better resultand practicability.
