Baka and Hongtai, two tight gas reservoirs in the Tuha Oilfield, show characteristics of serious water sensitivity and water block damage as well as great secondary damage to the reservoirs if the regular fracturing and acidizing fluids are used. Therefore, a study is conducted on the alcohol-based fracturing and acidizing fluids. Through the core sample tests, a quantitative analysis is carried out of the damage degree of water sensitivity and water block damage to the reservoirs, on this basis, the optimal concentration and dosage of alcohol and each additives are determined in fracturing and acidizing fluids, thus the specific acidizing fluid system with multi-hydrogen and alcohol is obtained not only to prevent serious water sensitivity and water lock damage but to achieve deep acidization. In addition, the recommendable concentration is also provided for each acid in the system of acidizing fluids. Moreover, the system of alcohol-based fracturing and acidizing fluids is thus designed applicable for the stimulation of Tuha tight gas reservoirs and shows a better performance than the regular ones. With this fluid system applied in 20 wells, a significant increase of well productivity is achieved as a result. This indicates that the new alcohol-based fracturing and acidizing fluids designed independently have excellent adaptability in this study area.

针对吐哈盆地巴喀和红台两个致密砂岩气藏常规的压裂液、酸化液水敏、水锁伤害严重,对储层的二次伤害大的实际情况,开展了醇基压裂液、酸化液技术研究.室内岩心实验定量分析了储层水敏、水锁伤害程度,确定了压裂液及酸液中甲醇及各添加剂的最佳浓度和加量,建立了既能防水锁水敏伤害、又能实现深部酸化的多氢酸+醇酸化液体系,给出了酸液体系中各酸型的推荐使用浓度,并最终研制出了适合该区致密砂岩气藏储层改造的醇基压裂、酸化液体系,其性能指标优于常规压裂、酸化液体系.现场20口井的试验应用取得了显著的增产效果,说明自主研制的醇基压裂液、醇酸酸液在该区具有很好的适应性.

Fracturing in slim hole and casing deformation wells is different from the fracturing in general holes. It needs to be equipped with the downhole tools of minor diameters and wellhead devices resistant to high pressure,reauires a lot on the carrying capacity,anti-shear performance,and the performance of reducing friction. In order to solve the difficulties in fracturing in slim hole and casing deformation wells,according to the specialty of slim hole and casing deformation wells and the reality of minor diameter downhole tools,the Y341-70 packer and K341-98 packer are developed and the design of downhole technique string is accomplished for Ф89 mm and Ф127 mm casing slim hole wells and Ф139.7 mm casing deformation wells. The fracturing fluid and fracturing operation are optimized. The technology is successfully accomplished on more than 40 wells and achieves good effect.

To characteristics of Niudong volcanic rock reservoir,such as poor physical property,high heterogeneity,rich natural fracture and strong reservoir sensitivity so on,basing on predicting fracture azimuth and reservoir cavern,tech is carried by conducting great discharge capacity,middle to high sand ratio,long fracture being built is carried out to increase probability of hydraulic fracture linking up reservoir fracture,pore and cave to form strong flowing and effective propped fracture,and by using tech of fracture fluid system optimizing,more plug friction and filtrate reducing,liquid nitrogen helping discharge,high speed gel breaking,deep penetration main fracture extending and technology parameter optimizing,fracturing gets breakthrough in volcanic rock pool of Santang lake.

Tuha oilfield is low permeability oilfield with multi-layer development, reservoir plane and profile heterogeneity is serious, with obvious interlayer difference, uneven reconstruction and sand fill problems caused by previously combined layer fracturing have severely restrained the reconstruction effect in recent years. As for the reservoir characteristics in Tuha oilfield, by studying the previous fracturing technology, combining performance parameters of separate layer packer and matching tool at present, separate layer fracturing technology suitable for Tuha oilfield has been developed, separate layer fracturing tool and string configuration have been matched and improved, well selective and layer selective principle and operation parameters optimization design of separate layer fracturing have been formed, which of these have taken significant effects in field application.

随着油田开发的深入,油藏能量开始衰竭,现多以注水来补充油藏能量,选择注水井落差测试获油藏地质特征及注水情况.电子压力计因其精度高,可以更清楚地反映井下的微小压力变化,最大限度地获取地层信息量.

Using the new model of introduced electric gauge, conducing test to the two wells, Ma6, 7 well of Santan lake, by comprehensive interpretation to reservoir and calculation to dynamic preservation, the aim of limited test is available. That solve the problem of limited test for unflowing well.

以吐哈油田LS1井为例,介绍了低渗透裂缝性泥砂岩层的试油技术.由于该井储层特殊,试油中难点较多,具体施工中,针对储层渗透性差、微裂缝发育、泥质含量高的不利因素,制定了与之相适应的技术措施,从强化射孔、地层测试、排液求产到酸化压裂改造都采用了较为先进合理的手段,有效地保护了储层.

三塘湖盆地马7井是一口稠油井,在对该井进行测射联作过程中,二开期间稠油自溢流压曲线形成了一种特殊的波形曲线,与常见的压降曲线有着显著的区别,且流压与流温曲线形成了刚好相反的曲线特征,通过分析研究发现,这种特殊的流压流温曲线的形成与地面温度变化有关.因此,在开发生产过程中可以采用增温降粘的方式来提高厚油产量.