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Sodium silicate cementing pre-fluid

A technology of cementing pre-fluid and sodium silicate aqueous solution, applied in chemical instruments and methods, drilling composition and other directions, can solve the problem of inability to meet the requirements of oil and gas well drilling and production operations, low return of cement slurry, and annular channeling And other issues

Active Publication Date: 2019-03-19
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

For loose formations with low pressure bearing capacity, fractured and sandy conglomerate formations, the downhole leakage during the cementing operation, the conventional cementing prefluid system cannot prevent and seal the leakage layer, resulting in low return of cement slurry.
The flushing and purification ability of the prefluid to the wellbore annulus is reduced, resulting in low cement interface bonding strength, poor sealing quality, and even annular channeling, which cannot meet the requirements of oil and gas well drilling and production operations

Method used

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  • Sodium silicate cementing pre-fluid
  • Sodium silicate cementing pre-fluid
  • Sodium silicate cementing pre-fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Indoor test:

[0022] 1) Prepare flushing solution: flushing agent BCS-010L: 3.5wt.%, the rest fresh water,

[0023] 2) Prepare sodium silicate solution: fresh water: 74.7%, sodium silicate: 25%, defoamer G603: 0.3%;

[0024] 3) Prepare spacer: fresh water, suspending agent BCS040S: 5%, diluent BCS-021L: 1%, defoamer G603: 0.3%, silicon powder aggravated to 1.25g / cm 3 ;

[0025] Cementing cement slurry: "B" grade oil well cement, lightening agent BXE-600S: 23%, suspension stabilizer GW-4: 0.04%, micro silicon: 5%, fluid loss reducer BXF-200L: 3%, anti-channeling Agent BCG-200L: 3.5%, defoamer G603:: 0.2%

[0026] Preparation: calcium chloride: 0.3g×3 parts

[0027] Indoor test content and method:

[0028] (1) Normal temperature performance of pre-fluid.

[0029] Table 1. Rheology of front fluid at room temperature

[0030]

[0031] (2) High temperature performance of prefluid (test condition of 70°C).

[0032] Table 2 Rheological properties of pre-fluid at ro...

Embodiment 2

[0052] Under normal geological conditions, the pre-fluid system is mainly to improve the bonding of the cement interface, and also to prevent leakage.

[0053] 1) Prepare cementing flushing fluid: fresh water, flushing agent G603: 3.5%;

[0054] 2) Prepare sodium silicate solution: fresh water: 74.7%, sodium silicate: 25%, defoamer G603: 0.3%;

[0055] 3) Prepare weighted spacer: fresh water, suspending agent BCS040S: 5%, diluent BCS-021L: 1%, defoamer G603: 0.3%, silicon powder weighting agent to 1.25g / cm 3 .

[0056] 4) Preparation of cement slurry: "B" grade oil well cement, silica fume: 45%, lightening agent BXE-600S: 23%, stabilizer GW-4: 0.06%, micro silicon: 8%, fluid loss reducer BXF-200L : 3%, anti-air channeling agent BCG-200L: 3.5%, defoamer G603: 0.2%

[0057] According to the pre-fluid 14m on site 3 design, where the cleaning fluid 3.5m 3 , accounting for 25% by volume; sodium silicate solution 6.5m 3 , accounting for 46.4% by volume; spacer 4m 3 , accounti...

Embodiment 3

[0063] In the complex geological downhole conditions with both overflow and leakage, the pre-fluid system is mainly used for plugging and interface cementation.

[0064] 1) Prepare flushing type weighted isolation fluid: clear water, suspending agent BCS040S: 5%, flushing agent BCS-010L: 5%, thinner: 1.5%, defoamer G603: 0.25%, silicon powder weighting agent to balance the formation pressure desired density.

[0065] This spacer is a double-action spacer, which has dual functions of flushing and isolation. The reason why it is a flushing type aggravated spacer is that it adds a flushing agent on the premise of the isolation function, and at the same time plays a flushing role.

[0066] 2) Prepare sodium silicate solution: clear water, 55% sodium silicate, density 1.26g / cm 3 ;

[0067] 3) Preparation of spacer fluid: clear water, suspending agent BCS040S: 5%, diluent BCS-021L: 1.3%, defoamer G603: 0.25%, silicon powder weighting agent to increase the density required to balan...

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Abstract

The invention discloses a sodium silicate cementing prepad flushing fluid, which comprises a flushing fluid, a spacer fluid and an aqueous sodium silicate solution with concentration of 25-55wt. %. Based on the existing cementing prepad flushing fluid, a sodium silicate solution is added, and the activation of sodium silicate on silicon and aluminum oxides and the like is utilized to improve the cementing strength of oil well cement as well as casing walls and well walls and resist the corrosion capacity of carbon dioxide and hydrogen sulfide to the surface of a casing; the sodium silicate percolates through a well wall mud cake and a soft clay layer to be chemically combined with calcium and magnesium salts and the like to form calcium and magnesium silicate and other silicone gel flocculates, the loose clay layer is solidified, the swelling and collapse of mud shale of a stratum are prevented, and the quality of well wall mud cake is improved. The sodium silicate cementing prepad flushing fluid provided by the invention has the advantage that except the cleaning effect of the original prepad flushing fluid is kept, the cementing strength of a cement wall interface can also be enhanced, and thus the cementing quality requirement is met.

Description

technical field [0001] The invention relates to the field of oil field cementing, in particular to a sodium silicate cementing prefluid. Background technique [0002] The existing pre-fluid system for oil and gas well cementing is usually divided into water-based pre-fluid system and oil-based pre-fluid system. The oil-based system realizes the flipping of the oil-based drilling fluid mud cake from lipophilicity to hydrophilicity, so as to satisfy the cement slurry’s replacement and sealing of the drilling fluid in the annulus between the wellbore and the casing, and ensure the sealing quality of the cementing cement . For loose formations with low pressure bearing capacity, fractured and conglomerate formations, downhole leakage during cementing operations, the conventional cementing prefluid system cannot prevent and seal the leakage layer, resulting in low return of cement slurry. The flushing and purification ability of the pad fluid to the wellbore annulus is reduced,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42C09K8/50C09K8/52C09K8/467C09K8/504
CPCC09K8/424C09K8/467C09K8/501C09K8/5045C09K8/52C09K2208/12
Inventor 刘振通庄建山吴永超宋元洪党冬红郭文猛周坚张亮
Owner BC P INC CHINA NAT PETROLEUM CORP
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