压裂

This model considers the effects of wall damage, fracture face damage, variation of fracture conductivity with position and time, heterogeneity and anisotropism, elastic expansion energy on production performance of fractured well. According to this model, a se...

实例计算表明，提供的模型和方法及研制的软件既可用于预测油田压裂前后的生产动态和压裂后的增产效果，又可用于压裂井水力压裂方案的优化设计。

Experiments of flow conductivity closure stress of typical propping agent are done, propping agent short-term flow conductivity alteration index is defined, by this, the relation between fissure short-term flow conductivity and closure stress, it is close to exponential relation. 4. Establishing the mathematical simulator of hydraulic fractured well's production in a steady state, finding the relation curve between dimensionless flow conductivity and fracture penetration coefficient by means of calculation and analyses, it is the basis of hydraulic fracture. 5. Expatiating the importance of optimized hydraulic fracturing design in reservoir engineering, advancing the optimizing design method, fracture dimension can be calculated easily when the physical parameters are known. 6. Production rate decline standard curve of vertical fractured wells is achieved by mathematical simulation, when the flow pressure is certain , by asymptotic analyze, this decline curve is close to exponential relation.

完成了国内外典型支撑剂的导流能力闭合应力影响实验，在数据分析中定义了支撑剂短期导流能力变异系数，并由此发现裂缝短期导流能力随闭合应力变化的近似符合指数关系式； 4 建立了一种水力压裂井稳态产能的数学模拟器，计算分析找到了最优无量纲导流能力与裂缝穿透比之间的新型关系曲线，它是水力压裂优化设计的基础； 5 阐述了水力压裂油藏工程优化设计的重要性，提出了优化设计方法，在已知支撑剂物性参数条件下可简洁计算最优裂缝尺寸； 6 数学模拟给出了垂直裂缝井产量递减标准曲线，在井底定压条件下通过渐近分析表明，该递减曲线满足指数关系式。

The analysis of frac pressure decline data is a common means of evaluating fracure patterns and of obtaining the important parameters for fracturing design.

压裂压力递减资料分析是评价压裂裂缝形态、获取压裂设计重要参数的常用手段。

Based on the reason analysis of failure primary fracturing, the fracturing fluid and proppant of refracturing were optimized, the half-length of fracture and construction parameters were also optimized for the optimum design of refracturing wells.

同时对初次压裂失效的原因进行分析后，对气井重复压裂的压裂液、支撑剂进行优选，对重复压裂气井的裂缝半长和施工参数进行优化，从而完善对气井重复压裂的优化设计。

The determination of formation fracture pressure and the geometry of hydraulic fracture is critical for designing rational fracturing program, providing optimal operation pressure, avoiding interzonal crossflow caused by excessive fracture height, and better stimulating the reservoirs.

确定地层破裂压力和水力压裂裂缝延伸几何形态，对于设计合理的压裂方案、提供合理的压裂施工压力、避免压裂裂缝高度过高导致地层间的层间窜漏、更好地达到改善储层的目的至关重要。

Preparation demand for concentratedly fracturing fluid is analyzed theoretically and the technique to prepare it is researched in the technology of "preparing while injecting". Stable lactescence should be prepared at first, and then a thickener should be added.

本文从水力压裂入手，综述了压裂液及其添加剂的发展概况，从理论上分析了"边配边注"技术中"浓缩压裂液"配制要求，研究了配制浓缩压裂液的工艺：应该是先配制稳定的乳状液，然后再添加稠化剂。

In terms of the water-in-oil emulsion theory, emulsion materials, emulsion methods, main additives and the volume ratio of oil and water were selected and then a basic formulation of the water-in-oil emulsion fracturing fluid was screened out. On the base of it above, the optimal formulation was optimized following the properties of reservoirs of Gars oil field, Qinghai Province and the performance of it was evaluated referring to SY/T5107-95. In the end of this paper, a idea of job design and technologies of fracturing optimize of the water-in-oil emulsion fracturing fluid were put forward.

论文首先从油包水乳化液的理论研究入手，通过对乳化材料、乳化方法的评选以及乳化剂、稠化剂、破乳剂、助排剂等添加剂和油水体积比的评选实验，筛选出了基本满足要求的油包水乳化压裂液配方体系：在此基础上，根据青海尕斯油田中浅层油藏的特征，进一步优化出符合该油藏条件的最佳配方压裂液体系，并参照石油与天然气行业标准SY/T5107-95对该配方油包水乳化压裂液进行了性能评价：最后提出了可行的油包水乳化压裂液施工设计思路及相应的压裂优化技术。

During the fracturing for low pressure and low permeability gas reservoirs, there are some main problems in conventional hydroxypropylguar - organic boron cross-linking system: Firstly, the water-lock damage to low pressure and low permeability gas formations by filter liquor; Secondly, the reason for alkali-sensitive damage in alkali-sensitive reservoirs is that conventional hydroxypropylguar - organic boron cross-linking fracturing fluids were cross-linked under alkaline environment, while the permeability of reservoirs is reduced greatly; Thirdly, the formation pressure is low, and the energy of flow back is not enough, at present, the main measure in oil fields is "injecting with liquid nitrogen", but this technique increased the cost of fracturing, making great troubles in operating, and leaving the liquid nitrogen also is a big problem.

在低压低渗透气藏的压裂改造过程中，常规羟丙基胍胶-有机硼交联压裂液体系存在的主要问题，一是压裂液滤液对低压低渗透气层造成的水锁损害；二是常规羟丙基胍胶-有机硼压裂液是在碱性条件下交联的，对碱敏性储层造成碱敏损害，降低储层渗流能力；三是地层压力低，压裂液返排能量不足，当前各油田采取的措施主要是&液氮伴注&技术，但是&液氮伴注&技术增加了压裂的费用，而且液氮存放也存在较大问题。

And it has already been developed from a simple and low fluid volume, low displacement fracturing well stimulation method into a mature technology.

压裂技术也从单井压裂发展到现在综合考虑水力压裂、油藏工程、采油工程及经济评价等的整体压裂技术。

It is important to reduce the span of the hard roof to avoid its impact load on supports. However, at longwall top coal caving face, the periodical weight of roof is a main factor that crushes the top coal, which is beneficial to the top coal recovery. How to use the roof pressure safely is of crucial importance in top coal caving. Based on field monitoring, theoretical analysis of strata movement, the numerical model of compound structure of hard roof stepped cantilever and the top coal cantilever beam is built, and the parameters of the model are also determined. The elasto-plastic finite element method is used to analyze the effect of hard coal fracture under the abutment pressure of hard roof, and the cracking coefficient is defined according to the stress state of the element.

通过对岩层移动的现场观测，建立了&两硬&条件综放采场台阶悬臂—悬臂梁组合的煤岩组合结构力学模型，并以此煤岩结构为基础，建立&两硬&条件综放采场顶煤压裂的有限元数值模型，分析了坚硬顶板不同来压步距对坚硬顶煤的压裂效应，并确定了合理的支架阻力，从而对坚硬顶板进行有效的控制，消除坚硬项板对采场的冲击隐患，同时保证采场矿压对坚硬顶煤的有效压裂，达到提高顶煤回收率之目的，由此形成了坚硬顶煤、坚硬顶板条件下综放采场围岩控制的基本理论和方法。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。