In order to effectively develop deep reservoirs, the selection of pumps in deep pumping technology is a difficult problem for Tahe oilfield. The optimization of deep pump should avoid the problems of large oil bar load, low pump efficiency, short pump detection period and high difficulty of deep well pumping, etc. By investigating the field application of the pump, the characteristics and parameters of the oil recovery work of five common deep pumpes were analyzed and compared. As a result, the deep pumping with side⁃flow loading pumps has the advantage of reducing the load on the sucker rod string. The actual pump depth of deep pumping with bi⁃lamellar pump is the largest. Deep pumping with self⁃compensating pump can reduce pump leakage, prevent sand sticking and prolong the life of deep pump.The oil pump of hydraulic feedback can solve effectively the problem of downward of rod string.The electric submersible pump and rod pump combination can significantly improve pump efficiency. The article provides some reference to the selection of mechanical production mode for other deep wells or the wells with insufficient fluid supply at the bottom of the wells.

The main contribution is to present stability analysis criterion for a type of norm⁃bounded uncertain perturbed discrete systems(NUPDS) with its states is subjected to a novel ellipsoidal outer approximation,which is different from the traditional bound description of general state. Based on the Lyapunov method, a delay dependent criterion and the corresponding state feedback control law, which are expressed in terms of linear matrix inequalities(LMIs) technology, are proposed to guarantee the asymptotic stability for the perturb delay systems. The solution of the LMIs can be obtained easily using existing efficient convex optimization techniques. A numerical example is given to illustrate effectiveness of the proposed method.

Combining fuzzy soft sets and both-brank fuzzy sets theory, the definition of double both-brank fuzzy soft sets are given. The both-brank fuzzy soft subset is further defined, and both-brank fuzzy soft sets are equal. The operations of intersection, union and complement of both-brank fuzzy soft sets are specified. Several properties of these operations have been studied.The both-brank fuzzy soft set is a brand new concept, and there are many places worth studying.

It is difficult to predict the accuracy of the river by using the conventional seismic attributes, due to the complex conditions of the terrigenous clastic basin reservoirs and the rapid change of the rock facies. In this paper, XII7-12 layer in N area of S oilfield is taken as an example. Through the seismic forward analysis, the seismic section reflection characteristics of different types of reservoirs are different, and the seismic attributes of the combined layer can be used as the effective dimension for the main channel prediction in this area. On this basis, using the method of the combination of Gray Relational Analysis and Support Vector Machine, the N zone seismic attribute prediction based on Gray Relational Support Vector Machine is completed. Drilling confirmed that based on Gray Correlation and Support Vector Machine attribute prediction, the drilling coincidence rate is higher. By using the advantage of seismic inversion to predict the boundary of the channel sand, the comprehensive analysis of dynamic and static data of the polymer flooding well group effectively solved the contradiction between the injection and production system of the XII7-12 strata system in the N area of the S oilfield, thus, it further confirms the accuracy of attribute prediction based on GRA-SVM. Comprehensive research shows that this method is suitable for high accuracy of the river prediction and can be used as a better river prediction method under complex geological conditions.

 

First, two mistakes about the Minkowski inequality of [WTHX]H[WTBZ]-matrix were pointed by practical examples and reason of the mistakes was found on a view of theory analysis. On the base, some necessary conditions were improved and Minkowski inequality was further modified by considering [WTHX]H[WTBZ]-matrix properties, using eigenvalues’ distribution, inequality’s calculation and other methods，and the corresponding results were generalized. Second, another important inequality of [WTHX]H[WTBZ]-matrix was also generalized by the analysis of the Minkowski inequality. The modify and generalization not only offer supports to the [WTHX]H[WTBZ]-matrix theory itself, but also do good to development of biology, computers and mathematics and other related fields.

The concepts of local (α,β)-diagonally dominant matrix were introduced. Under the condition of local (α,β)-diagonally dominant matrix with a nonzero elements chain, by constructing a positive diagonal matrix [WTHX]X[WTBZ], the conclusion that [WTHX]B=AX[WTBZ] was α-diagonally dominant matrix with a nonzero elements chain was presented, and a criterion for nonsingular [WTHX]H[WTBZ]-matrix was obtained. The outcome implies that the extended local (α,β)-diagonally dominant concept is a development for matrix's diagonally dominance's theory, and a strong tool for researching [WTHX]H[WTBZ]-matrix and [WTHX]M[WTBZ]-matrix.