1.Oil-well cement:Cement or any mixture of cement and other materials suitable for well cementing.

2. Portland cement:The general name of cement with calcium silicate as the main component. It refers to a kind of cement with high strength, which is only grinded by adding a certain amount of gypsum in the clinker without any admixture.

3.API cement:The American Petroleum Institute (API) calls the cement used in oil wells API cement. And the standard is established.

4.API cement classification:The American Petroleum Institute divides oil well cement into nine grades: A, B, C, D, e, F, G, h, J.

5.Basic cement:It refers to grade g and H cement in API oil well cement series. Use a wider range after adding additives.

6.Sulfate resistant cement:Cement with high sulfate resistance, i.e. cement with limited C3a mineral. According to gb10238, the cement with C3a < 8% is medium sulfate resistant (MSR); the cement with C3a < 3%, c4af + 2c3a < 24% is high sulfate resistant (HSR).

7.Neat cement:Cement without additives or admixtures.

8.hydraulic cement:Cement that hardens or solidifies rapidly without dilution in an aqueous environment.

9.Pozzolanic cement:It is a kind of cement with high temperature resistance, high strength and corrosion resistance, which is composed of silica materials such as volcanic ash, burnt clay, fly ash and lime or quinate cement.

10.High alumina cement:Bauxite and limestone are mixed, sintered and ground to produce an aluminate cement with a fire resistance of more than 1650 degrees.

11.Modified cement:A cement whose chemical or physical properties are changed by an admixture.

12.High early strength cement(high initial strength cement):Cement to improve the early strength of cement stone.

13. Accelerated cement(quick set cement):Oil well cement with accelerator to shorten thickening time.

14. Gypsum cement:Cement added with water mixed gypsum to improve the early strength.

15. Slow set cement:Cement in which the thickening time is prolonged by reducing C3S content and increasing C2S content or adding chemical retarder to basic cement.

16. Expansive cement:With the expansion agent, the cement has a proper amount of expansion in the solidification process.

17.Permafrost cement(freaze protecting cement):The fast setting, low hydration heat cement used in the permafrost area without melting the permafrost layer by mixing gypsum with cement or high alumina cement.

18.High temperature cement:Quartz sand is added to improve the strength of cement stone. It can be used for cement with well temperature over 110 ℃.

19. Weighted cement:Cement uniformly mixed with high density inert materials.

20.Light weight cement(low density cement):Cement made by mixing light materials evenly.

21.Filler cement:Cement mixed with filler material.

22.Fly ash cement:Low density cement made of fly ash and oil well cement.

23.Gel cement:Cement modified by bentonite.

24.Micro-spheres cement:Low density cement with silica hollow beads.

25.Foamed slurry:The ultra low density cement slurry mixed with nitrogen or air and surfactant is prepared through foam generator.

26.Thixo-tropic cement:Add thixotropic agent to enhance thixotropy, which is used for cementing or plugging lost well.

27.Fiber cement:Cement with fiber added to dry cement or cement slurry to improve plugging performance.

28.Resin cement(plastic cement):With water-soluble resin, it is suitable for selective plugging cement.

29.Diesel oil cement:A cement slurry made of diesel or kerosene and surfactant.

30.Salt resisting cement:It is suitable for cementing special cement with salt resisting agent.

31.Salt saturated slurry:The cement slurry used for well cementation of rock salt layer is prepared with saturated salt water.

32.Latex cement:A cement slurry made by mixing latex, surfactant and water.

33.Small particle size cement:It refers to the cement whose particle size is many times smaller than that of grade g (100-150 μ m). It can be used to solve the problems of squeezing cement and plugging blastholes in micro cracks or channeling channels.

34.Micro-silica flour cement:Special cement with ultra-fine silica powder can improve the ability of controlling gas channeling and reduce the permeability of cement stone.

35.Compressible(gas containing)cement:Cement with a gas producing material added. It is used to compensate for the decrease of effective pressure of cement slurry during solidification.

36.Impermeable cement:It is a kind of cement with special additives to prevent the fluid migration between the pores of particles during the solidification process, so as to improve the ability of preventing gas channeling.

37.Acid soluble cement:Cement added with carbonate rock powder to improve acid solubility.

38.Radio-active cement:A cement slurry made from slurry water containing radioactive elements. Used to check cementing quality.

39.Conductive cement:Cement with electrical conductivity by adding additive. It is used in the scientific test of electrical measurement.

40.Oil well cement properties:It refers to the chemical and physical properties of oil well cement.

41.Oxides:Oxides of oil well cement include:SiO2, CaO, Fe2O3, Al2O3, MgO, SO3, K2Oand loss on ignition.

42.Compounds of cement clinker:Cement clinker contains the following basic compounds:C3Si, C2Si, C3A, C4AF. These compounds play a decisive role in the performance of cement.

43. (W/C) water cement ratio:The ratio of water in cement slurry to cement weight.

44.Soundness:It reflects the physical properties of the uniformity of the volume change of cement after hardening.

45. Fineness:The degree to which cement clinker is ground, expressed in specific surface area, in cm²/ g.

46.Free water:The water that precipitates out of the cement slurry during the static process. Test according to GB10238.

47.Slurry density:Refers to the mass of cement slurry per unit volume.

48.Compressive strength:Under the action of pressure, the cement stone can bear the maximum force per unit area before failure.

49.Bond strength:Refers to the cement and casing or formation cementation degree.

50.Initial set:When the test needle of the cement setting time tester (Vicat) sinks into the cement slurry 0.5 ~ 1.0mm from the bottom plate, it is considered that the cement slurry reaches the initial setting.

51.Initial setting time:The time from adding water to initial setting of cement.

52.Final set:When the test needle of cement setting time tester (Vicat Apparatus) sinks into the cement slurry no more than 1mm, it is considered that the cement slurry reaches final setting.

53.Final setting time:The time from initial setting to final setting of cement slurry.

54.Setting time:The total time of initial and final coagulation.

55.False set:An abnormal phenomenon similar to rapid setting occurs after cement is mixed with water for several minutes. There was no obvious exothermic during the false coagulation. The fluidity can still be restored by continuous stirring after false setting.

56.Flash set:An abnormal rapid setting phenomenon occurs immediately after the cement is combined with water. A large amount of heat will be released in case of instantaneous condensation, which will harden rapidly.

57.Hydration heat:Heat released by hydration reaction after cement and water are mixed.

58.Hydrated water:Water required to chemically combine with cement to form a crystalline compound.

59.Maximum water:The free water consumption of the cement slurry is less than 1.5% after it is stirred for 20 minutes in the atmospheric consistometer.

60.Minimum water:The consistence value of cement slurry at 20 min atmospheric pressure is 30 ABC water consumption.

61.Normal water:The consistence value of cement slurry at 20 min atmospheric pressure is 11 ABC water consumption.

62.Slurry yield:Refers to the volume of cement slurry that can be prepared by each bag of cement.

63. curing:To create appropriate stability and humidity conditions for hydraulic materials (including Portland cement), so as to facilitate its hydration and hardening process.

64.Cured at atmospheric pressure:Curing of cement samples by hydration and hardening at a given temperature and humidity under atmospheric pressure.

65.Pressure curing:Curing of cement samples in water above atmospheric pressure at a given temperature.

66.Initial viscosity:In the thickening time test of cement, the maximum consistency measured from 15 to 30 minutes from the beginning of the test is called the initial consistency (BC).

67.Thickening time:The time required from the time when the cement slurry is heated and pressurized to the time when the cement consistency reaches 100BC (consistency unit) is called the cement slurry thickening time.

68.Rectangular thickening curve(right angle set(RAS) curve):In the thickening time test of cement slurry, the consistency of cement slurry is always kept at a low level. When it reaches a certain time, the consistency suddenly increases to 100BC, and the thickening curve forms an approximate right angle state. This kind of cement slurry is good for overcoming gas channeling.

69.Cement strength:It refers to the general term of the ability of water slurry to bear various external loads after it solidifies into cement stone.

70.Permeability of cement stone:The ability of oil, gas and water to pass through cement.

71.Cement slurry filtration:Under the condition of 7MPa differential pressure, the filtration of cement slurry was measured in 30min with the specified water loss instrument.

72.Dynamic fluid lose:Water loss of cement slurry measured by mixing water loss meter.

73.Dehydration:Due to the poor control of cement slurry loss of water, a large amount of water loss is formed in permeable formation during or after cementing.

74.Cement additive:A general term for various admixtures used to adjust the performance of cement paste.

75.Accelerator:The admixture can accelerate the hydration reaction of cement and shorten the setting time of cement slurry. Some accelerators can also improve the early strength of cement paste.

76.Retarder:An admixture used to delay the hydration of cement to extend the thickening time of cement paste.

77.Dragreducer(dispersant):It is used to reduce the apparent viscosity and dynamic shear force of cement slurry, and it is easy to enter into turbulent state under the condition of relatively low-speed displacement. In order to improve displacement efficiency and reduce pump pressure.

78.Light weight additive(density reducing additive):An admixture used to reduce the density of a cement slurry.

79.Fluid loss control agent (filtration control agent):An admixture used to reduce the loss of water in cement slurry.

80.Mud decontaminant:The additive can neutralize the influence of drilling fluid treatment agent, improve consolidation and improve the strength of cement stone.

81.Radioactive tracer(radioactive tracing agent):The most commonly used tracers are sulfur 131 and scandium 46, which are radioactive substances with short half-life. During the cementing operation, the material is added to the collar slurry. Through gamma logging, the cement return height and leakage position can be determined.

82.Gelling agent:An additive used to increase the cementitious strength of a cement slurry.

83.Non-freezing agent:It can reduce the freezing point of water in cement slurry and accelerate the setting and hardening of cement slurry at low temperature.

84.Extender:The material added to increase the slurry making rate or reduce the density of the cement slurry.

85.Foam stabilizer: In foam cement slurry and drilling fluid, the tension at the solid-liquid gas interface can be reduced, and the admixture for the formation and stability of bubbles and the strength of bubble film will be improved.

86.Thermal stabilizing agent: Admixture added to prevent the strength decline and damage of cement stone under high temperature. Such as: quartz powder.

87.Fly ash:Ash dust after coal combustion. It is a kind of artificial volcanic ash, containing silicon or silicon, aluminum and other materials, which belongs to oil well cement lightening agent.

88.Well cementing:For the drilled open hole, cementing is used to seal the oil, gas and water layers by running casing and cementing, and strengthening the well wall is called cementing.

89.Cementing design:It refers to casing string strength, casing structure, casing running and cement injection design, which is the basis of cementing construction.

90.Cementing techniques:Cementing operation completed by using different cementing equipment, tools and technology.

91.Liner cementing:After the tail pipe is sent to the design well section with drill string, the method of cementing and sealing the annular space of the tail pipe section is adopted.

92.Rheology balance pressure cementing:During the whole process of cement injection construction and cement slurry waiting for setting, the dynamic liquid column pressure of cement slurry shall be kept from leaking into the formation, while in the process of waiting for setting, the static liquid column pressure shall not be damaged by oil, gas and water to the channeling of cement ring under the condition of weightlessness.

93.Cementing method:It refers to the general term of various methods for pumping cement slurry into the casing after running the casing, and then replacing the cement slurry to the design position outside the pipe with drilling fluid.

94.Conventional primary cementing:Cement slurry is injected into the casing and replaced by upper and lower rubber plugs to make the slurry return out of the casing.

95.Two(multiple) stage cementing:Continuous or discontinuous cementing operations can be carried out in two or more stages, which is realized by installing a tapping collar at a predetermined position of the casing. This method is commonly used in long cementing section.

96.Inner string cementing (through DP stab in cementing):In a large-diameter casing, a method of cement injection in which the drill pipe or tubing is used as the inner pipe and the cement slurry is injected through the inner pipe and returned from the casing shoe to the annular space.

97.Multiple string cementing:In a multi reservoir well, in order to exploit more economically, a cement injection method is to put multiple oil pipes in one well as casing.

98.Outside cementing(annular cementing):The method of injecting cement into the annulus through the annulus inserting pipe.

99.Reverse circulation cementing:The method of reverse cement injection through the annular space of casing.

100.Delayed set cementing:The cement injection method of running in the drill string and injecting the retarded cement slurry with super long thickening time, then pulling out the drill string and running in the casing.