In order to strengthen the research of water control technology Daqing deep gas field and realize the double growth of oil and gas production and economic benefits, the scientific researchers have innovatively constructed and implemented an integrated water control mode. This mode not only improves the management level of scientific research projects and the quality of achievements, but also speeds up the progress of achievements transformation. It provides a strong support for the development pattern of stabilizing oil and increasing gas production. The results show that the integrated water control concept is constructed, which includes timely diagnosis of effusion, accurate process selection and effect evaluation optimization. An integrated water management organization is established to form a vertical and efficient integrated water management mode. The intelligent decision-making platform for gas well water control is established, and the diagnostic accuracy is increased from 63.1

南苏丹ANANAS区块部分大尺寸套管井采用土酸和桥塞酸化工艺解堵增产,但土酸反应过快,桥塞管柱操作复杂且存在酸液泄漏风险,因此亟需研制大尺寸套管井多级酸化技术.通过设计小截面定活塞、分离进液口与注酸口、选定T型密封圈密封注酸口,研制了新型注酸器;通过酸液缓蚀性能评价、络合性能测试及配伍性试验,优选出一种适用于该区块储层的HV缓速酸液体系.室内试验表明:新型注酸器开启压力高达8 MPa以上,能使?147 mm封隔器稳定坐封;理论上单趟管柱可酸化15段且可用于套管验漏;HV缓速酸液体系缓蚀性能优于常规土酸体系,能够有效络合储层金属离子,抑制二次沉淀产生,与多种添加剂配伍性能良好.该技术可用于大尺寸套管井3段以上酸化增产,采用HV缓速酸体系能有效扩大酸液作用距离,解除近井地带伤害,措施效果显著,建议今后考虑转向酸压,以进一步提高储层改造程度.

Currently, there are about 30,000 damaged-casing wells in Daqing Oilfield in China and nearly 10

Novel combined double jet nozzle not only keeps the excellent ability of rotary jet cutting reaming, but also give full play to the strong rock breaking capacity of the Conical single hole jet. In this paper, we use Solid works to complete the modeling of the calculation domain of the combined double jet nozzle, and by using the ANSYS software, the flow field simulation of injector can be realized with the help of The calculation results show that the kernel velocity of novel combined double jet nozzle cylinder end can up to 160 m/s under the working pressure of 60 MPa, at the same time, it can generate large turbulent kinetic energy at the outlet of the nozzle center hole, and the maximum value is 45 m2/s2. The simulation result illustrates that Under the combined action of the center hole jet and the edge hole jet, Novel combined double jet nozzle will produce greater cutting force on the breaking of the rock, and in the radial direction, it will cause a larger area of rock fragmentation.

With the development of fracturing technology in oil and gas wells, downhole fracturing tools have developed from drillable to soluble. More and more soluble metal materials have been applied to the design and development of downhole tools, and they have achieved good application effect in field applications. The research of this paper is to evaluate the erosion wear rate of soluble aluminium alloy under different fracturing scales and sand conditions by setting up an indoor erosion wear test device and referring to the evaluation criteria of erosion wear of metal materials at home and abroad, so as to provide a theoretical basis for tool structure design. The indoor simulation test results show that the max erosion angle of soluble magnesium-aluminum alloy is 40°, and it increases with the increase of erosion sand ratio. When the sand content reaches 400–600 cubic meters and the diameter of the inner hole of the soluble fracturing slip sleeve processed by soluble aluminium alloy is 34 mm, the loss of erosion wear wall thickness is 1.507 mm–2.261 mm, which meets the needs of fracturing construction.

At present, the technology of ASP flooding in Daqing Oilfield has entered the stage of industrialization and popularization. The total number of injection wells of ASP flooding has reached more than 4000. At present, the main problem of ASP flooding layered injection wells is that after injection of ASP compound solution for a certain period of time, the displacement effect is poor due to the sticking of scale and micelle in the partial hole and throttling element of injector A series of influences, such as the increase of the workload and the shortening of the period of measurement and adjustment, etc. However, the existing anti scaling technology mainly deals with the parts that are easy to scale, which has the advantages of high lubrication, low friction and non viscosity. However, due to the variety and different performance, it is necessary to compare and evaluate the anti scaling performance. However, the conventional coating evaluation method mainly judges the advantages and disadvantages of the coating technology through the conventional inspection indexes such as appearance size, roughness and smoothness There is no practical significance for the evaluation of the anti scaling performance of the special environment of ternary injection. Based on the field test, this paper forms a set of evaluation method for the scale prevention performance of ASP flooding, realizes the evaluation and optimization of the scale prevention performance of ASP flooding, and effectively prolongs the testing and adjusting period

Deep penetration of radial horizontal drilling techniques from existing within the wellbore radial drilling information, is for the old oil fields, the marginal oil field, low permeable reservoirs and coal bed methane development provides an effective recovery or economic means to improve the single well production. Using integrated hydraulic deep penetrating technology of downhole tools can be up to 2 m length of horizontal drilling, hole diameter 20 to 50 mm, can effectively penetrate the drilling, completion and conventional shells perforating technology in the form of pollution area near wellbore area, to penetrate auxiliary directional fracturing can effectively transform low permeability fractured reservoir. Using the radial jet of step-by-step horizontal drilling technology, use under continuous tube on drilling tools, horizontal drilling length of 20–50 m or more. It points out the traction ability of nozzle and drilling performance is the length of the horizontal drilling and for the key factors influencing the maximum range.

For current downhole releasing blowout prevention technology of the Y445 packer with sliding sleeve switch used in mechanical recovery wells has the problems of low blowout prevention success rate, poor long-term reliability and complicated procedures, the development of free delivery releasing blowout prevention and anchoring integrated pipe string has been carried out. The pipe string is mainly composed of suspension packer, float switch, poke rod and other key tools. It downs to above the perforation top boundary with the pump, when the pump is inspected again, the float switch is closed to seal the formation fluid under the packer. Laboratory tests and field applications show that the pipe string can realize wellbore blowout prevention during pump inspection of screw pump wells, the technical problems of potential safety hazards and environmental pollution caused by well liquid ejection to the ground in the process of up and down the pipe string has been resolved.

The water absorption capacity of injection wells is unfavorable in some blocks of Daqing Oilfield due to the limit form the border wells being shielded by faults, reservoir physical properties and system pressure, etc. In order to explore effective ways to stimulate the hard recovery reservoirs with low permeability and to quickly replenish the formation energy, a pilot on pressure increase water flooding test with skid-mounted pump was carried out in Hailar main production blocks of Daqing Oilfield. The selection of well and its formations was carried out after considering geological factors. The injection volume and liquid property were optimized according to sand body development level, effective thickness of reservoirs and effective porosity. The downhole long-term & high-pressure injection pipe string has been developed with bearing the temperature of 120 °C and pressure of 70 MPa, which will meet the requirements of high pressure, large displacement and long-time injection. A selected pilot well was injected continuously for 9 days with the cumulative water injection of 4277 m3. Four connected production oil wells around the pilot injection well had different effects, whose daily liquid production all increased significantly. The technology has been carried out in the Type III thin & poor reservoirs of Daqing Oilfield, which will provide technical support for improving oil recovery further. It will have good prospects for popularization.

The displacement target of the ASP flooding in Daqing Oilfield has gradually shifted to class II reservoirs, which are characterized by multiple layers and great difference in permeabilities. The percentage of 3-5 layer injection wells has reached more than 50%. Currently, there are two main problems existing with the separate injection technology. First, due to the different microscopic molecular structure of the ASP solution, the viscosity loss of the ASP solution is more than 1 times higher than that of the polymer under the same injection conditions, which affects the displacement effect of ASP flooding. Second, the ASP system of a single molecular weight cannot meet the displacement requirements of all oil layers. To solve the two problems, a separate molecular weight and pressure injection technology is developed for ASP flooding. Based on the microscopic mechanism and simulation study, the separate molecular weight and pressure injection technology for ASP flooding is developed in this paper. The injection string can inject different ASP solutions of different molecular weights into different layers at different injection rates as required to match different oil layer permeabilities. Thus, the control of molecular weight and injection rate for separate layers in ASP flooding can be achieved. At the flow rate of 50m3/d, the adjustment range of molecular weight is 20-50%, the maximum throttling pressure difference can reach 1.5MPa or more, and the maximum loss of viscosity is less than 7.8%. Up to now, this technology has been applied to the field tests of more than 800 wells. Since the application of this technology, the injection profile has been effectively improved, and the pay-gross thickness ratio has been increased by 8%. With this technology, the separate injection for 3-5 layers and control of molecular weight as well as injection rate for separate layers to match the different oil layer permeabilities in ASP flooding can be achieved. This technology will play an important role in the development of major oil fields in the future.

Daqing Oil Field is the largest continental oil field in China. It is a large heterogeneous sandstone oil field with various permeability layers in longitudinal. Polymer flooding plays an important role in Daqing Oil Field which has recovered 10 million tons oil per year for 11 years. In the process of commingled polymer injection, most of the solution enters high permeability layers. Consequently, low permeability layers cannot be swept effectively which limits the recovery rate of polymer flooding. Based on the successful experiences of separate layer water flooding technology applied in Daqing Oil Field, several separate layer polymer flooding techniques were developed. The purpose of this technology is to inject polymer solution into pay zones separately with different pressure and flow rate according to reservoir properties, getting a stable injection profile of polymer solution in longitudinal direction so as to improve the overall recovery rate. The key points of this technology lie in three respects: First, the injected polymer solution should have a stable flow rate and pressure difference in the whole duration of polymer flooding. Second, the injected polymer solution should keep a higher viscosity to ensure EOR result of polymer flooding. Thirdly, the economic factor must be considered. This paper presents a unique separate polymer injection technology which solves the above issues effectively. The injected nozzle is designed into a special streamline style with different stages. When polymer solution flows through the nozzle, the molecular chains of polymer will expand and contract, creating an additional pressure difference. The more stages it has, the higher pressure difference can be reached. Furthermore, the shape of nozzle is optimized by simulation tools to ensure the minimum viscosity loss of polymer solution during the injection. After the optimal design, the maximum additional pressure difference of this nozzle can reach 2.5 MPa at the injection flowrate of 50 m3/d as well as viscosity loss ratio is less than 6

Deep penetration of radial horizontal drilling techniques from existing within the wellbore radial drilling in formation, is for the old oil fields, the marginal oil field, low permeable reservoirs and coal bed methane development provides an effective recovery or economic means to improve the single well production. Using integrated hydraulic deep penetrating technology of downhole tools can be up to 2 m length of horizontal drilling, hole diameter 20–50 mm, can effectively penetrate the drilling, completion and conventional shells perforating technology in the form of pollution area near wellbore area, to penetrate auxiliary directional fracturing can effectively transform low permeability fractured reservoir. Using the radial jet of step-by-step horizontal drilling technology, use under continuous tube on drilling tools, horizontal drilling length of 20–50 m or more. It points out the traction ability of nozzle and drilling performance is the length of the horizontal drilling and for the key factors influencing the maximum range.

大庆油田累计套损井近万口,为了动用这些压裂程度低、剩余油相对富集的潜力井,开展了多级大规模压裂工艺研究.通过有限元软件分析胶筒肩部角度、长度与应力之间的关系,并通过油浸实验验证了胶筒在大形变下的耐温承压性能;应用自编软件优化调整关键部件尺寸,设计了工艺配套工具.最终确定了小直径封隔器胶筒肩部角度50°,长度550 mm;小直径喷砂器能够针对套管内径大于 ?104 mm的套损井进行施工,工艺覆盖率提升至70％;新型锚定工具可确保工具通过套损点并使管柱稳定;双功能防喷封隔器能够实现目的层封隔及油管防喷.现场试验结果表明,该工艺及配套工具能够用于套损井压裂,单趟管柱可压裂5层,砂量289 m3,初步实现了套损井大规模压裂施工.

Abstract Oilfield development in China has entered the high water cut stage. Waterflooding development is faced with ineffective water injection and rapid increase of water cut, due to complex injection-production relationship, unbalanced production and severe interlayer contradictions. Besides, total number of separated layer injectors increases with years, single-well layers subdivision becomes more elaborate, and the measuring and adjusting frequency is gradually accelerated, which exponentially increases measuring and adjusting workload. A low cost whole process monitoring and control technology package for separated layer water injection was developed in this paper to tackle key problems about single-layer downhole flowrate measurement, layered adjustment and communication in wellbore, and to realize the digitalized real-time monitoring of separated layer pressure and injection rate for single well and the networking of dynamic water injection monitoring information on blocks and reservoirs. This technology was piloted in block. The pilot test block has small well spacing and fast breakthrough speed of injected water, where oil to be produced has greatly varied physical properties, and the production in different layers is unbalanced. In recent years, the water cut has increased fast, the annual water cut increase is above 0.8%, and the comprehensive water cut is 97.2%. By utilizing real-time monitoring and adjustment, effective water injection has been realized, and the increase of water cut has been maintained at less than 0.5% since one year ago when the block was selected for pilot test. Moreover, this technology is also provided with the functions of on-line seal check, static pressure test, water injection profile test and dynamic adjustment, and so site test and adjustment jobs can be minimized.

本文介绍了该井蒸汽吞吐热力试油现场施工的工艺过程,着重阐述了蒸汽吞吐热力试油队伍现场施工过程和施工中出现的几点问题,希望为今后其他从事松辽盆地西部斜坡热力试油队伍的施工提供一些帮助和借鉴,因而能提高热力试油队伍的施工质量,从而减轻工人劳动强度,缩短施工周期。因此,获得更好的施工效率,创造更好的经济效益。