Drilling Magazine Media Intelligence, Contextual Wisdom
Mahmoud mousaei
The cement work is expletive of each hole in a well. The problem we are facing these days in the results of cement work operations is the bad quality of some of cements and drilling cement addictive produced inside the country. Regarding to not having access to the updated addictive production technology during the sanctions, South Oil-bearing region announced its needed materials for construction and production and gave its laboratories to the companies to do their tests by try and error. And this issue had a very important role in leading the producers to improve the quality of cement addictive.
In a general view, one successful cement work operation is a result of 3 stages: pre-operation, during operation and post-operation. For having a successful cement work operation all these 3 stages should be done properly. By pre-operation we mean improving the Parietal drive shafts. Because one well improving and one static well can make the possibility of success in cement operation by loss or flow point of view. If the well’s situation is not good in improving, it will cause loss in cement work and this leads to lack of proper cement packing behind the parietal.
When parietal drive shafts also proper use of centralizers and correct way of parietal is very important. For example, one of the things that centralizers do in addition to keep the parietals in center and have a good dialysis for passing the cement grout, is to remove drilling muds from the walls and this causes that this mud does not destroy the cement grout. So a proper and exact supervising in this section can be so effective.
Supervising on cement grout making and using qualified materials is one of the other factors which can raise efficiency and cement work success. Always, existing a supervisor from drilling cement addictive producer or supplier Company is a necessity.
Drilling cement engineering is also one of the most effective factors in having a good cement work operation. Unfortunately in our country it has been paid less attention to this part of the drilling industry in the whilst the world’s big oil companies consider drilling cement engineering as one of the most important and sensitive part of engineering. If there is a good cement work in different operations, it can be so effective in side costs reduction. This issue may not look very important at the first sight, but in long term and periodical expense account will show its importance.
Drilling cement formulation like other sections of drill engineering depends on two factors: science and experience, and experience can have a very significant share in supplying a drilling cement plan.
Surely, after cement work operation, drawing thickening charts and drilling cement quality and study and analyze them also special test for each operation like dried pressure test, pressure test and so on can have a very significant share in future cement work situation.
South Oil-bearing region by means of localizing drilling addictive has defined research project in constructing and producing the drilling cement addictive including 5 types of drilling cement addictive in form of Reverse Engineering which has leaded to producing 4 types of them.
In addition, the policy of South Oil-bearing region was in a way that qualified foreign material existed in storage are used for the wells with more sensitivity like Maroon field which is complicated, its Asmari reservoir is layered, layers have different pressures and producing zone and aquifers are close. About consuming drilling cement produced by four drilling cement producers which can be used in Iran for wells with regular situation and in deep wells G type cement produced inside Iran cannot be used.
But the goal is the cement production factories can find a way to make their products favorable and to the extent of international standard.
Cement operation in all over the world is being done by one company integrated and coherently. For example; supplying and maintenance of cement and drilling cement addictive, cutting and mixing, transportation to wellhead, formulation designing, making the soluble on wellhead and finally pumping the cement inside the well are all done in form of a coherent operation, and after cement working operation by hydraulic tests and running cement thickening quality log, successes will be defined.
One of the other problems of cement work operation in South Oil-bearing region is that cement work operation is not done by one company and continuously.
Next subject is about drilling cement addictive in which nowadays profitability is more important than quality, and at present and by elimination of the sanctions and possibility of entering foreign companies’ products and emerging the competitions, it can be a flip to domestic producers to have more effort on their quality improvement.
When talking about cement work operation, immediately all attentions will be paid to the cement itself and its addictive, But other factors which can be participant in cement work operation’s lack of success would be: cement work equipment such as centralizers, plugs, hoofs, and cement rings tools for installation of lining pendants. And we do not have to ignore them simply. So cement and drilling cement addictive and tools and equipment using in cement work operation must be used according to standards defined index of big cement work companies and due to the well situation.