The95/8" Casing Cementing Technology Research Of Halfaya Oilfield In Iraq

High pressure.salt-gypsum layer, high-density, narrow density window are cementing problems for Halfaya of Iraq oilfield of244.5mm technology casing cementing. By the244.5mm casing cementing technology research for of Iraq oilfield, has succeed the formation of a high-temperature, high-pressure, high salt-gypsum resistance of high-density cement slurry system, and by changing the cementing process and improvement of technical measures, formed a set of cementing technology high-temperature. Salt-gypsum layer, high-density. The global problems of high pressure salt layer, high-pressure brine layer, narrow density window and high density cementing of the Halfaya oilfield have been Solved the problem.The project of Halfaya is one of the key development block of oil in Iraq, since November2010launch, for high pressure and high pressure brine salt layer interval Φ244.5mm casing cementing quality has always been not ideal, could not reach the requirements of exploration and development, has seven well cementing quality is poor, seriously affected the method of oil field exploration and development. Introduced as a result, party a Baker. Weatherford and other international well-known companies into the Halfaya. oil field, in order to solve the problem of poor cementing quality, but they also not solve the Halfaya oilfield high pressure salt layer, high pressure brine and narrow density window layer of high density cementing problem.. therefore, to carry out the high temperature and high pressure, high salt, high density cement slurry system research, is not only solve the encountered technical problems in the market development, has enriched the BHDC eager demand.Against Iraq Halfaya,244.5mm for the oil field casing cementing high pressure salt layer, high density, narrow density window of cementing problem, the company projects in a timely manner to carry out the research project. Through program research, forming a set of high temperature and high pressure, high salt, high density cement slurry system, and by changing the cementing technology and improve the technical measures and formed a set of high temperature, high salt, high density slurry cementing the comprehensive technology, has solved the Halfaya, oilfield high pressure salt layer, high pressure brine and narrow density window layer of high density cementing the worldwide problem.Research content:including increasing optimization of material and the additive material:Suitable for high temperature and high pressure, high salt and high density cement slurry additive selection; According to the principle of particle accumulation theory and grain size distribution, high density cement slurry system of indoor research and field application research; High temperature and high pressure, high salt, high density cement slurry system comprehensive performance evaluation; In2.30to2.60g/cm3density cement slurry mixed equipment. mixed construction technology and construction technology of the research:High density cement slurry system of channeling prevention theory and evaluation research; High density cement resistance to H2S corrosion performance evaluation and research.In this paper, the main research results are as follows:1. The study used three different granularity material, the application principle of grain size distribution and density accumulation2.60g/cm3of high temperature and high-theory, formed a density of2.30g/cm3density cement slurry formulation.2. The study of high temperature and high density cement slurry. static temperature-system suitable for circulating temperature is90℃150℃170℃temperature range.-of110℃3. The research of high temperature and high density cement slurry system has good rheological properties, low API fluid loss, low free water, low sedimentation stability (good), high strength, high salt, high temperature strength without recession.4. The study of high temperature and high density cement slurry system has good anti channeling property, gas channeling prevention capacity is to strong.5. The study of high temperature and high density cement slurry system has certain CO2and H2S corrosion resistance.6. The high temperature and high density cement slurry system has good compatibility, can be suitable for fresh water, inorganic salt and organic salt drilling fluid system.7.The selection of micro silicon, suspension property, thermal stability and improve the performance of early strength, and completely replace mn suspending agent, the research of high temperature and high density cement slurry system more reasonable formula, the cost is lower.8. Temperature or density fluctuations impact on construction safety is larger, the higher the temperature or density is higher, the greater the effect. In actual use. therefore, should take relevant simulation experiments.9. The good performance of high temperature and high density cement slurry system construction, the use of the existing equipment, can be very convenient, easy implementation and application in the field.10. Application of high density cement slurry system in Iraq ha method and the market is completed the244.5mm casing cementing19, greatly improve the cementing quality, solved the hoffa and oilfield cementing technical problems of high density narrow density window. Including HF109N109Wells, HF007S007H well cementing quality of high quality9-5/8. obtain the high praise.