阅读说明：本技术 一种用于调整井固井的胶乳防窜水泥组合物、水泥浆 (Latex anti-channeling cement composition and cement slurry for adjusting well cementation ) 是由 曾欣 郭进忠 王海娟 仝继昌 冯名正 张娜 杨少春 于 2019-12-03 设计创作，主要内容包括：本发明属于石油钻井技术领域,具体涉及一种用于调整井固井的胶乳防窜水泥组合物、水泥浆。本发明的胶乳防窜水泥组合物主要由以下重量份数的组分组成：油井水泥60～70份,胶乳0.5～3份,降失水剂1～2份,减阻剂1～1.5份,早强剂1～2份,膨胀剂0.2～0.4份,消泡剂0.1～0.2份；所述膨胀剂为铝粉类发气剂。由本发明的胶乳防窜水泥组合物和水形成的水泥浆综合性能良好,具有过渡时间短,滤失量低、微膨胀、韧性好等特点,用于调整井固井时具有较好的防窜性能。(The invention belongs to the technical field of petroleum drilling, and particularly relates to a latex anti-channeling cement composition and cement slurry for well cementing adjustment. The latex anti-channeling cement composition mainly comprises the following components in parts by weight: 60-70 parts of oil well cement, 0.5-3 parts of latex, 1-2 parts of fluid loss additive, 1-1.5 parts of drag reducer, 1-2 parts of early strength agent, 0.2-0.4 part of expanding agent and 0.1-0.2 part of defoaming agent; the expanding agent is an aluminum powder gas former. The cement paste formed by the latex anti-channeling cement composition and water has good comprehensive performance, has the characteristics of short transition time, low filtration loss, micro-expansion, good toughness and the like, and has better anti-channeling performance when being used for adjusting well cementation.)

1. A latex anti-channeling cement composition for adjusting well cementation is characterized by mainly comprising the following components in parts by weight: 60-70 parts of oil well cement, 0.5-3 parts of latex, 1-2 parts of fluid loss additive, 1-1.5 parts of drag reducer, 1-2 parts of early strength agent, 0.2-0.4 part of expanding agent and 0.1-0.2 part of defoaming agent; the expanding agent is an aluminum powder gas former.

2. The latex anti-channeling cement composition for adjusting well cementation according to claim 1, characterized by consisting essentially of the following components in parts by weight: 65 parts of oil well cement, 2 parts of latex, 1.3 parts of fluid loss additive, 1.3 parts of drag reducer, 1.2 parts of early strength agent, 0.3 part of expanding agent and 0.2 part of defoaming agent.

3. The latex channeling-preventing cement composition for regulating well cementing according to claim 1, wherein said aluminum powder gas generating agent is at least one of QJ625 oil well cement swelling agent, TW502, DG 29.

4. A cement slurry for adjusting well cementation, comprising water and the latex anti-channeling cement composition for adjusting well cementation according to claim 1.

5. The cement slurry for adjusting well cementation according to claim 4, wherein the mass ratio of the water to the oil well cement in the latex anti-channeling cement composition is (5-6): (12-14).

Technical Field

The invention belongs to the technical field of petroleum drilling, and particularly relates to a latex anti-channeling cement composition and cement slurry for well cementing adjustment.

Background

After the oil field is developed for a long time, the formation energy is seriously insufficient, and the frequently-mined blocks generally need to be injected with water or polymer to supplement the formation energy. And the next two gates, twin rivers, ancient cities and other blocks have entered the era of tertiary oil recovery represented by polymer flooding and ternary combination flooding. The development over time has led to extremely complex pressure systems and fluid properties in the oil field. Because the pressure difference between the upper layers in the longitudinal direction is large, the contradiction between pressure stability and leakage prevention when a new drill is used for adjusting well cementation is prominent. The micro-gap generated by the volume shrinkage after the cement is hydrated for well cementation leads the well cementation quality to be difficult to ensure, thereby generating the problems of unqualified production layer or interlayer sealing, oil, gas and water leakage outside a casing pipe and the like, causing interlayer interference to layered injection and production, complicating the oil production process, reducing the utilization rate of an oil well and shortening the service life of the oil well.

Disclosure of Invention

The invention aims to provide a latex anti-channeling cement composition for adjusting well cementation, which can shorten the transition time of cement slurry.

It is also an object of the present invention to provide a cement slurry for adjusting the cementing of a well, which cement slurry has a short transition time.

In order to achieve the above objects, the latex anti-channeling cement composition for adjusting well cementation of a well according to the present invention employs the technical scheme of:

a latex anti-channeling cement composition for adjusting well cementation mainly comprises the following components in parts by weight: 60-70 parts of oil well cement, 0.5-3 parts of latex, 1-2 parts of fluid loss additive, 1-1.5 parts of drag reducer, 1-2 parts of early strength agent, 0.2-0.4 part of expanding agent and 0.1-0.2 part of defoaming agent; the expanding agent is an aluminum powder gas former.

The latex anti-channeling cement composition of the invention has the following functions: the aim of improving the toughness and compactness of cement is fulfilled by utilizing the characteristics of high elasticity of latex, flexibility of an adhesive film and good cementing capacity between the latex and oil well cement; the fluid loss agent has the function of reducing the filtration loss of cement; the early strength agent has the function of improving the early compressive strength of the cement. The latex anti-channeling cement composition is mixed with water to form cement paste, and micro air bubbles generated by the expanding agent are uniformly distributed in the cement paste, so that the pressure loss and the volume shrinkage during the solidification of the cement paste can be effectively compensated; the drag reducer has the functions of improving the rheological property of cement paste and reducing the flow resistance; the defoaming agent has the function of eliminating bubbles. The latex anti-channeling cement composition can shorten the transition time of cement paste and has good compatibility among the components.

Preferably, the latex anti-channeling cement composition for adjusting well cementation mainly comprises the following components in parts by weight: 65 parts of oil well cement, 2 parts of latex, 1.3 parts of fluid loss additive, 1.3 parts of drag reducer, 1.2 parts of early strength agent, 0.3 part of expanding agent and 0.2 part of defoaming agent. The latex anti-channeling cement composition composed of the components in parts by weight has the best performance.

The aluminum powder gas former is at least one of QJ625 oil well cement expanding agent, TW502 and DG 29.

The technical scheme adopted by the cement slurry for adjusting well cementation of the invention is as follows:

a cement slurry for adjusting well cementation comprises water and the latex anti-channeling cement composition for adjusting well cementation.

The cement slurry for adjusting well cementation of the well increases the compactness of cement by utilizing the characteristic of good cementing capacity of latex and a cement matrix, thereby improving the anti-channeling capacity of a cement body. In addition, by adding the aluminum powder gas-generating expanding agent into the cement paste, the hardened cement stone volume is larger than the cement paste volume before hydration in the cement paste hydration process, thereby avoiding the cement stone volume from shrinking to form micro-gaps and achieving the purpose of improving the well cementation quality and preventing the channeling outside the pipe. The cement slurry has the characteristics of short transition time, small filtration loss, no volume shrinkage, good toughness and the like, has good anti-channeling effect, excellent performance, simple preparation method and excellent quality of on-site implementation well cementation, can effectively solve the problem of adjusting channeling outside a well pipe by a high-pressure water injection polymer injection block, and improves the quality of well cementation.

The mass ratio of the water to the oil well cement in the latex anti-channeling cement composition is (5-6): (12-14).

Detailed Description

The latex anti-channeling cement composition for adjusting well cementation mainly comprises the following components in parts by weight: 60-70 parts of oil well cement, 0.5-3 parts of latex, 1-2 parts of fluid loss additive, 1-1.5 parts of drag reducer, 1-2 parts of early strength agent, 0.2-0.4 part of expanding agent and 0.1-0.2 part of defoaming agent; the expanding agent is an aluminum powder gas former.

Preferably, the oil well cement is a grade G oil well cement. Further preferably, the oil well cement is a G-grade high sulfate-resistant oil well cement.

Preferably, the latex is styrene-butadiene latex or polybutadiene latex. More preferably, the latex is BCT-800L styrene-butadiene latex.

Preferably, the fluid loss agent is a polymer fluid loss agent. Further preferably, the fluid loss agent is a nonionic synthetic polymer fluid loss agent. More preferably, the fluid loss additive is at least one of G33S oil well cement high temperature resistant salt resistant fluid loss additive, W99, TW200S and G303. Preferably, the fluid loss agent is a G33S oil well cement high temperature resistant salt resistant fluid loss agent.

Preferably, the drag reducer is a naphthalenesulfonic acid formaldehyde condensate drag reducer. More preferably, the drag reducer is a USZ oil well cement high temperature resistant drag reducer.

Preferably, the early strength agent is a compound early strength agent. More preferably, the early strength agent is one of G203 oil well cement early strength agent and G209 early strength agent. Preferably, the early strength agent is a G203 oil well cement early strength agent.

Preferably, the defoaming agent is a silicone oil type defoaming agent. More preferably, the antifoaming agent is D50 antifoaming agent, XP-1 antifoaming agent, XP-2 antifoaming agent. Preferably, the defoamer is a D50 defoamer.

The cement slurry for adjusting well cementation of the invention is prepared by the method comprising the following steps:

(1) mixing oil well cement, a fluid loss agent, a drag reducer, an early strength agent and an expanding agent according to the formula ratio to obtain a mixture A; adding the latex and the defoaming agent in the formula amount into the water in the formula amount, and mixing to obtain a mixture B;

(2) and (2) adding the mixture A obtained in the step (1) into the mixture B for mixing to obtain the catalyst.

And (2) when the mixture A is prepared in the step (1), the mixture is mixed and stirred in a dry mixer for 3-5 min at room temperature, and when the mixture B is prepared, the mixture is stirred at the stirring speed of 150-250 r/min for 5-10 min at room temperature.

And (3) when the mixture A is added into the mixture B in the step (2), adding the mixture A at a constant speed at a stirring speed of 3500-4500 r/min, and finishing within 15 s.

And (3) after the mixture A is added into the mixture B in the step (2), stirring for 34-36 s at a stirring speed of 11500-12500 r/min.

The present invention will be further described with reference to the following specific examples.

In the following examples, the oil-well cement used was a G-grade high sulfate-resistant oil-well cement (Kaga corporation, Sichuan), the latex was BCT-800L butylbenzene latex (Kaga engineering science and technology Co., Ltd., Tianjin), the fluid loss additive was a G33S oil-well cement high-temperature-resistant salt-resistant fluid loss additive (Kaga chemical Co., Ltd.), the drag reducer was a USZ oil-well cement high-temperature-resistant drag reducer (Kaga chemical Co., Ltd.), the early strength additive was a G203 oil-well cement early strength additive (Kaga chemical Co., Ltd.), and the defoaming agent was a G50 defoaming agent (Kaga engineering science and technology Co., Ltd., Tianjin).

Examples of a latex anti-channeling cement composition for adjusting well cementing