Long-horizontal-section horizontal well cementation curable prepad fluid and application thereof

A technology for horizontal sections and horizontal wells, which is applied in the field of curable prefluid for long horizontal section horizontal well cementing, which can solve the problems of lack of density and achieve the effect of inhibiting mudstone and meeting the needs of cementing

Active Publication Date: 2020-04-21
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides long horizontal section horizontal well cementing curable prefluid and its application, the purpose is to solve the above problems The density is between 1.50-2.0g / cm3, which cannot be used in long horizontal wells with a cement slurry density below 1.35g / cm3. The existing technology The lack of prefluid with a density of about 1.20g / cm3 and satisfying mudstone inhibition and leakage prevention and plugging performance

Method used

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  • Long-horizontal-section horizontal well cementation curable prepad fluid and application thereof
  • Long-horizontal-section horizontal well cementation curable prepad fluid and application thereof
  • Long-horizontal-section horizontal well cementation curable prepad fluid and application thereof

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Embodiment 1

[0044] An embodiment of the long horizontal section horizontal well cementing curable pad fluid of the present invention, the long horizontal section horizontal well cementing curable pad fluid, the long horizontal section horizontal well cementing curable pad fluid consists of the following mass The composition of the serving:

[0045] G grade cement 20-30 parts;

[0046] Closed cell vitrified perlite 20-30 parts;

[0047] 30-40 parts of slag powder;

[0048] Micro silicon 8-12 parts;

[0049] 4-8 parts of plaster of paris;

[0050] 0.6-1.5 parts of sodium sulfate;

[0051] 2-3 parts of quicklime;

[0052] 2-3 parts of slaked lime;

[0053] 2-3 parts of sodium metasilicate;

[0054] 1-2 parts of sodium carbonate;

[0055] Water 95.9-141.8 parts.

[0056] In the above examples, the formulation of the pre-fluid has high solid phase inhibition of mudstone and has a certain ability to prevent leakage and plugging, and can play a good role in isolation and well washing. I...

Embodiment 2

[0065] Furthermore, another embodiment of the curable preflush for cementing long horizontal wells in the present invention further includes an admixture, and the admixture is composed of the following components:

[0066] 2.0-3.5 copies of fluid loss reducer;

[0067] Drag reducer 0.2—0.3 parts;

[0068] Retarder 0.15—0.4 parts;

[0069] Defoamer 0.1-0.3 parts.

[0070] In the above-mentioned embodiment, adopt the comprehensive lightening and stabilizing technology, in order to realize 1.20 g / cm 3 For the following system density, 20%-25% vitrified expanded perlite and 8%-12% micro-silica powder are added to the system, and the selected solid-liquid ratio range is 1.05-1.20; the system depends on Cement, gypsum, and silica fume combine water molecules to stabilize the system. Over time, the underground temperature rises, and the chemical reaction of admixtures activates the binding force between slag, cement, lime and water to maintain system stability.

[0071] The curab...

Embodiment 3

[0073] Combine the following materials:

[0074] G grade cement 25 parts

[0075] Closed cell vitrified perlite 25 parts

[0076] 30 parts of slag powder

[0077] Micro silicon 10 parts

[0078] 5 parts plaster of paris

[0079] 1 part sodium sulfate

[0080] Quicklime 2 parts

[0081] 2 parts slaked lime

[0082] 3 parts sodium metasilicate

[0083] 1 part sodium carbonate

[0084] The above-mentioned solid phase materials are stirred evenly by physical methods, and only need to add different amounts of retarders, fluid loss reducers and drag reducers according to the well temperature and well type, and adjust the thickening time of the system; according to the formation leakage equivalent According to the size, different water-solid ratios within the selected range can be used to form different system densities. Recommended water-solid ratio: 1.07, density: 1.14—1.17g / cm 3 .

[0085] Admixture and water-solid ratio range of use:

[0086] Fluid loss reducer 2.0-3....

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Abstract

The invention discloses a long-horizontal-section horizontal well cementation curable prepad fluid, and belongs to the field of petroleum and natural gas exploration. The long-horizontal-section horizontal well cementation curable prepad fluid is prepared from G-grade cement, closed-pore vitrified perlite, slag powder, micro-silicon, calcined gypsum, sodium sulfate, quick lime, slaked lime, sodiummetasilicate and sodium carbonate. According to the invention, an alkaline mudstone inhibitor is introduced, and a solid-phase material and related functional additives are comprehensively utilized to construct the curable prepad fluid which can stabilize a mudstone stratum, has good compatibility with a drilling fluid and cement paste, is stable in self system and has curing characteristics.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas exploration, and in particular relates to a curable prefluid for long horizontal section horizontal well cementing and its application. Background technique [0002] In cementing construction, the front fluid is an important isolation protection slurry section between cement slurry and drilling mud. Especially in the cementing of Changqing horizontal well, due to the discontinuous production layer, mixed with carbonaceous mudstone and fractured rock section, due to the mudstone meeting low The solid-phase spacer fluid is prone to dissolution and creep, reducing the safety of the wellbore in the horizontal section, and easily causing leakage when encountering fractured rock sections. [0003] Adding curing materials with latent curing properties to the traditional pre-fluid system, together with admixtures such as activators, coagulation regulators, and dispersants, and external admixtures,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C04B28/00
CPCC09K8/424C09K8/426C09K8/467C04B28/00C04B2111/00724C04B14/185C04B18/141C04B18/146C04B22/143C04B22/147C04B22/064C04B12/04C04B22/10C04B24/2623C04B24/38C04B2103/0068C04B2103/50Y02W30/91
Inventor 魏周胜梅明佳白新平段宏超马立国周兵赵丹张茹
Owner BC P INC CHINA NAT PETROLEUM CORP
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