Tough impact admixture for oil well cement

An oil well cement and anti-shock technology, which is applied in wellbore/well components, earthwork drilling, sealing/isolation, etc., can solve the problems of low cementing quality rate, poor impact resistance performance, and poor cementation quality, etc., and achieve Rapid gelling strength, strong channeling resistance and good flexibility

Inactive Publication Date: 2004-06-23
DAQING PETROLEUM ADMINISTRATION
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Problems solved by technology

[0004] In order to overcome the shortcomings of existing cement stones such as poor impact resistance, poor cementation quality, and low cementing quality rate, the present invention provides a tough and impact-resistant oil well cement admixture, which can improve the performance of cement slurry and increase the cement stone’s resistance. Impact performance, which is beneficial to prevent and control water and gas channeling, and improve cementing quality

Method used

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Examples

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Effect test

Embodiment 1

[0015] Example 1: Well Xing 7-21-635 in Daqing is located in the abnormally high-pressure area of ​​Xingbei. The wells in this block are wells in off-surface reservoirs. The cementing rate is high, the interlayer pressure difference is large, and a thick floating mud cake is formed, which is not clean enough to replace it, thus affecting the cementing quality. The cement slurry prepared by the cement admixture of the above scheme 1 was applied on site for well cementing. Compared with the clean slurry, the cement slurry prepared by the cement admixture has better cement performance and fracture toughness of 0.382MPa.m 1 / 2 , the specific pulp fracture toughness is 0.087MPa.m 1 / 2 Large; the elastic modulus is 15.4GPa, which is smaller than the elastic modulus of the clean slurry which is 19.72GPa; the crushing absorption energy is 2.63J / cm 3 ; Specific pulp crushing absorption energy is 1.37J / cm 3 Small; after perforation and fracturing, the percentage of the fully cemented p...

Embodiment 2

[0016] Example 2: Daqing Xing 3-31-648 oil well is cemented using the cement slurry prepared by the cement admixture prepared in the above scheme 2. Compared with the clean slurry, the cement slurry prepared by the cement admixture has better cement performance and fracture toughness. 0.383MPa.m 1 / 2 , the specific pulp fracture toughness is 0.087MPa.m 1 / 2 Large; the elastic modulus is 15.2GPa, which is smaller than the elastic modulus of the clean slurry which is 19.72GPa; the crushing absorption energy is 2.68J / cm 3 , the crushing absorption energy of the pure pulp is 1.37J / cm 3 Small, with a daily liquid production of 24 tons, a daily oil production of 9 tons, and a water content of 62.5%. The 8 wells put into production in this block at the same time all adopt clean slurry cementing, the production method is the same, the production layer is the same, the average daily liquid production is 31 tons, the oil production is 3-4 tons, and the average water content reaches more...

Embodiment 3

[0017] Example 3: Well Xing 2-341-30 is an adjustment well for the third infill in Xing 1-3 area. Casing damage wells in this block account for 30% of the total number of oil and water wells, and high pressure layers are easy to form in casing damage layers. Fault shielding, lithology lame pressure zones, high formation pressure at the top and low at the bottom, and large pressure difference between layers. These complicated geological conditions make it difficult to guarantee the cementing quality. Compared with the clean slurry, the cement slurry prepared with this cement admixture in this well has a cement stone performance and fracture toughness of 0.385MPa.m 1 / 2 , the specific pulp fracture toughness is 0.087MPa.m 1 / 2 Large; the elastic modulus is 15.0GPa, which is smaller than the elastic modulus of the clean slurry which is 19.72GPa; the crushing absorption energy is 2.72J / cm 3 , the crushing absorption energy of the pure pulp is 1.37J / cm 3 High, the transition time f...

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Abstract

The present invention relates to tough impact admixture for oil well cement for oil field well drilling and fixing. The present invention features that the tough impact admixture for oil well cement consists of vinyl acetate 1-4 (in weight portions, the same below), polyol 5-8, inorganic sodium salt 0.1-0.5, binary hydroxycarboxylic acid 0.1-0.3 and naphthalenesulfonate 0.1-0.5. The tough impact admixture has the features of fast solidification, waterproofing and antiseeping, low water loss, quick increase of coagulation strength, and powerful looseness resisting strength. It can raise the compact strength of cement ring and well fixing quality.

Description

Technical field: [0001] The invention relates to a cement admixture used in the field of oilfield drilling and cementing technology for densification and adjustment of wells, and belongs to the toughness and impact resistance oil well cement admixture that can improve the toughness and deformation resistance of cement stone. Background technique: [0002] Due to the demand for production capacity and the development of development technology, oilfields, especially Daqing Oilfield, have developed off-surface reservoirs or thin poor oil layers. However, the remaining oil potential of thin and poor oil layers is mostly distributed in thin layers and hard-to-recover reservoirs with poor oil layer physical properties and low permeability. Generally, fracturing and deep penetration perforation techniques are required to tap the potential. The anti-dynamic load capacity of the ring puts forward higher requirements. Because the cement stone used for well cementing is a brittle mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/16
Inventor 莫继春赵永会李扬卢东红金永男
Owner DAQING PETROLEUM ADMINISTRATION
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