Zeng Yijin, deputy dean of the Petroleum Engineering Technology Research Institute and petroleum engineering expert, pointed out that in recent years, China's oil demand has grown rigidly, and the dependence on foreign oil has approached the warning line, while 40% of the remaining domestic oil and gas resources are in the deep, overseas cooperation zone. Block oil and gas reservoirs are also mostly in deep layers. Therefore, solving the technical problems of deep oil drilling and cementing and accelerating deep oil and gas exploration and development research has become an important measure to increase China's oil production and solve the current energy crisis.
Closely track the development of cementing technology
Zeng Yijin introduced that the research on cementing technology under the conditions of high temperature and high pressure in ultra-deep wells has been the subject of follow-up research. In recent years, oil well cement admixtures, cementing technology, cementing tools and accessories, cementing design simulation and Progress in analysis software, cement slurry replacement technology, and cementing equipment is very rapid. At present, cementing equipment has been widely used for operation automation, density control precision, large energy and high power development, and complex formation cementing technology is becoming more and more perfect. Cementing computer simulation, simulation and monitoring technology has improved the accuracy, pertinence and scientificity of cementing scheme design and on-site construction. The development of drilling technology has also led to small well cementing, horizontal well cementing, and branch well cementing. Advances in cementing technology for special process wells such as large displacement cementing.
Zeng Yijin said that more than 10 years ago, in response to the development trend of foreign cementing technology, researchers have been working on the research of mechanical nitrogen injection foam cement slurry cementing technology, and developed corresponding admixtures, computer control systems and supporting on-site construction techniques. technology. Based on the experience of foreign chemical foaming, the research on new foam cement slurry cementing technology was carried out. Through the foam stabilizer, it forms a stable and independent foam cement slurry, which greatly simplifies the construction equipment and process, and has achieved satisfactory results in oilfield applications such as Changqing, Shengli and Liaohe. At the same time, a lot of research work has been done on the formation of the ring air (water) enthalpy, the physical process of the influencing factors, the prediction method and the anti-gas slag cement slurry system. The expansion cement, the delayed cementing cement, and the touch have been researched and developed. Various anti-clog cement systems, such as cement, compressible cement and non-permeable latex cement, are also very effective in field applications.
Every step in cementing is key
“Gluing is a comprehensive art, and there is no difference in any link.†Zeng Yijin said that drilling fluid conversion cement slurry (MTC) cementing technology, for example, adds hydration to the mud. The material converts the drilling fluid into a cementing fluid with a certain strength under certain conditions. At present, most of the domestic and foreign blast furnace slag is used as a hydraulic material to replace Portland cement. It is precisely because this technology is conducive to improving the quality of cementing, especially to improve the quality of cementation of the second interface. Since the research and application in the 1980s, it has attracted great attention in the cementing industry and is considered to be the traditional cementing operation. A revolution.
With the development of the petroleum industry, deep wells, ultra-deep wells, horizontal wells, branch wells, and large displacement wells have increased year by year. At the same time, the tapping of old blocks and thin oil reservoirs is becoming more and more common. In order to meet the requirements of horizontal wells and large-displacement wells and reduce the friction of the casing, the ball-type rigid centralizer, the downhole starting rigid centralizer, the casing floating coupling, etc. have been developed successively. Play a pivotal role.
With the accumulation of practice, the requirements for cementing are also increasing. After years of research, the Dezhou Continental Shelf Company of the Engineering Institute developed a long open-hole packer with cement slurry expansion instead of cementing. In order to solve the problem of cementing the tail pipe in the long open hole, the hydraulic grading hoop combined operation technology of the tail pipe hanger and the matching special rubber plug system came into being. The continuity of the construction is guaranteed.
In order to fix a well, the cement slurry replacement technology is also a key link in cementing. Zeng Yijin said that the effective laminar flow cementing technology is better under the condition that turbulence cannot be realized. Aiming at the technical problems of low cement slurry displacement efficiency in irregular wells in deep wells, the theoretical analysis of the turbulent flow and plug flow of different calipers is proposed. Combined with casing centering, wellbore treatment, flushing fluid and spacer fluid technology, the problem of irregular cementing of the wellbore is solved.
After analyzing the cementing technology at home and abroad, Zeng Yijin pointed out that the series of tail pipe hangers, double-stage cementing devices, casing centralizers, casing clamps and casing outer isolations researched and developed by the Texas Forestry Company of the Academy of Engineering. Accessories such as inner tube cementing device, cement head and floating hoop, floating shoes, etc., basically meet the requirements of on-site cementing technology. The quality and reliability are close to foreign products, and they have basically replaced imported products in China. Among them, the horizontal well tail pipe cementing ball feeder is the first in China.
Increase the research and development of unconventional cementing technology
When talking about the prospect of cementing technology, Zeng Yijin said with confidence that cementing technology has developed with the advancement of drilling technology. At present, cementing materials, oil well cement admixtures and their process technologies have all been upgraded to a new one. The height, continuous introduction of new processes, new technologies, new materials, basically adapt to the increasing demand for oilfield exploration and development. Especially in the past 10 years, the progress of cementing technology in deep wells and ultra-deep wells is very obvious, and a series of matching cementing tools and cementing technology measures have been formed.
At the same time, he pointed out that cementing technology has a long way to go, adjusting new cementing admixtures and cement slurry systems, new cementing and completion tools, deep wells under complex conditions, ultra-deep well cementing technology, anti-gas and cementing technology, and complex pressure system adjustment. Well research and development of well cementing technology and anti-corrosion cementing technology will be intensified. With the deepening of oil and gas exploration and development and the advancement of science and technology, cementing technology will continue to be promoted, enriched and improved.
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