By Domitila B. De Chungara, Visit Amazon's Victoria Ortiz Page, search results, Learn about Author Central, Victoria Ortiz, , Moema Viezzer
First released in English in 1978, this vintage ebook comprises the testimony of Domitila Barrios de Chungara, the spouse of a Bolivian tin miner. mixing firsthand money owed with astute political research, Domitila describes the hardships persevered by means of Bolivia's substantial operating category and her personal efforts at organizing ladies within the mining neighborhood. the result's a gripping narrative of sophistication fight and repression, an immense social rfile that illuminates the truth of capitalist exploitation in Seventies Bolivia. Domitila Barrios de Chungara used to be born in 1937 within the Siglo XX mining city in Bolivia. She grew to become politically lively within the Sixties and, in 1975, participated within the UN overseas Women's yr Tribunal in Mexico. In 2005 she was once nominated along 999 different "Peace girls" for a collective Nobel Peace Prize.
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Extra info for Let Me Speak! Testimony of Domitila, a Woman of the Bolivian Mines
Table 2-1 Mechanisms of Fluid Loss Prevention Macroscopic particles Microscopic particles Chemical grouting Suspended particles may clog the pores, forming a filter-cake with reduced permeability. Macromolecules form a gel in the boundary layer of a porous formation. A resin is injected in the formation, which cures irreversibly; suitable for bigger caverns. Vertical Flow Lateral Flow Drill Hole Filter Cake Porous Formation Figure 2-1. Formation of a filter-cake in a porous formation from suspension (•) in a drilling fluid.
The rheologic properties of the fluid allow it to be used in a number of applications in which protection of the original permeable formation is desirable. The applications include drilling, fracturing, and controlling fluid losses during completion operations, such as gravel packing or well workovers. Gellan (Xanthan, Sderoglucan, or Wellan) It has been found that gellan has good characteristics as a filtrate reducer in water-based drilling fluids [515,516]. Preferential use is made of native gellan, which has a considerable gelling capacity and good solubility.
Temperature causes coagulation and dehydration of clay platelets. Polymers protect bentonite from such negative effects. Formation Damage The damage of the formation resulting from the use of a filtration loss agent can be a serious problem for certain fields of application. Providing effective fluid loss control without damaging formation permeability in completion operations has been a prime requirement for an ideal fluid loss control pill. Filter-cakes are hard to remove and thus can cause considerable formation damage.