A kind of suspension alleviating agent and its preparation method and application
A technology of lightening agent and suspending agent, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of poor performance of cement slurry, difficult to meet construction requirements, etc., and achieve the effect of strength improvement
Active Publication Date: 2019-05-28
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
The common suspension components are soil, water glass, etc. The advantages are that the cement slurry has a simple composition, a high slurry production rate, and low cost, but the performance of the cement slurry is poor, and it is difficult to meet the construction requirements.
Method used
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Embodiment 1-6
[0032] Weigh the aqueous phase suspension of silicon dioxide, polyurethane suspending agent and water according to the contents in Table 1, and mix to obtain the suspension alleviating agent.
[0033] Table 1
[0034]
[0035]
[0036] Note: The particle size of silicon dioxide in LUDOX HS40 is 12nm, the content is 40%, pH=9.5; the particle size of silicon dioxide in LUDOX HS30 is 12nm, the content is 30%, pH=9.8; the silicon dioxide in LUDOX AS40 The particle size of silicon dioxide in LUDOX SM30 is 7nm, the content is 30%, and pH=10.
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Abstract
The invention discloses a suspending lightening admixture, which comprises a silicon dioxide liquid, a polyurethane suspending agent and water, wherein the weight ratio of the silicon dioxide liquid to the polyurethane suspending agent to the water is (40-70):(10-30):(20-50). The invention further discloses a preparation method of the suspending lightening admixture and an application of the suspending lightening admixture in low-density cement paste. The preparation method comprises the step of mixing the silicon dioxide liquid, the polyurethane suspending agent and the water. The low-density cement paste of which the density is within the range of 1.30-1.60g / cm<3> can be prepared by using the suspending lightening admixture; the strength of a cement stone can reach 3.5 MPa with the adjustable range of the density of the cement paste; and other properties of the cement paste all can meet the requirements of cementing operation of a low-pressure loss circulation zone, especially offshore cementing operation.
Description
technical field [0001] This application relates to but not limited to a low-density cement slurry system, in particular to but not limited to a low-density cement slurry suspending agent and its preparation method and application. Background technique [0002] Hydration-curable cement components are often used in the field of oil and gas well production. Cement is injected downhole, and the cement slurry is filled and solidified in the annular space between the casing string and the wellbore to form a cement sheath to protect and support the casing and isolate the oil, gas and water layers. This operation is also called well cementing. [0003] In some oil fields, low-pressure and high-permeability formations will be encountered during drilling, and conventional density cement slurry is used for cementing operations. The hydrostatic column pressure generated by the cement slurry is often greater than the formation fracture pressure, so it is very easy to cause well leakage ...
Claims
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IPC IPC(8): C09K8/473C04B24/28
CPCC04B40/0039C09K8/473C09K2208/10C04B22/002C04B18/148C04B24/282
Inventor 张浩李厚铭宋茂林冯颖涛赵琥王永松冯克满
Owner CHINA NAT OFFSHORE OIL CORP