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Saturated saline solution mud fluid taking brine as base solution and preparation method of saturated saline solution mud fluid

A brine and mud technology, which is applied in the field of saturated brine slurry and its preparation, can solve the problems of high mud cost, reducing the use of solid powder weighting materials, and difficult maintenance, etc., to solve the problem of irregular well diameter, inhibit corrosion, and reduce well diameter Extended effect

Inactive Publication Date: 2013-08-21
中成新星油田工程技术服务股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For this reason, the technical problem to be solved by the present invention lies in the relatively high cost of mud that can be used for salt-gypsum layer drilling in the prior art, and then provides a low-cost brine that is suitable for salt-gypsum layer drilling. Saturated salt water slurry as base fluid
[0010] The second technical problem to be solved by the present invention is to provide a salt water slurry with a relatively large specific gravity of the base fluid itself, which can reduce the use of solid powder weighting materials at the same specific gravity, and is used to solve the problem of high specific gravity mud in the prior art due to excessive addition. Difficult maintenance problems caused by materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Get 100mL brine solution, the specific gravity of the brine solution is 1.28, add NaCl to the brine solution under stirring conditions until saturated, then add 2g anti-saline soil, 8g sulfomethyl phenolic resin, 1g Sulfomethyl lignite, 1.0g hydroxyethyl cellulose, stir for 10-15 minutes to mix. The specific gravity of the obtained brine slurry was 1.42, the plastic viscosity was 6 mPas, the dynamic shear force was 4 Pa, and the API fluid loss was 8 mL.

[0059] It shows that the fluid loss and rheological properties of the salt water slurry described in the present invention are good.

Embodiment 2

[0061] Get 100mL brine solution, the specific gravity of the brine solution is 1.25, add NaCl to the brine solution under stirring conditions until saturated, then add 9g attapulgite and 2g sulfomethyl phenolic resin to the saturated brine solution, 5g sulfomethyl lignite, 0.2g hydroxyethyl cellulose, stir for 10-15 minutes to mix. The obtained brine slurry had a specific gravity of 1.43, a plastic viscosity of 8 mPas, a dynamic shear force of 6 Pa, and an API fluid loss of 9 mL.

[0062] It shows that the fluid loss and rheological properties of the salt water slurry described in the present invention are good.

Embodiment 3

[0064] Get 100mL brine solution, the specific gravity of the brine solution is 1.25, add NaCl to the brine solution under stirring conditions until saturated, then add 4g sepiolite, 6g sulfomethyl phenolic resin, 2g Sulfomethyl lignite, 0.8g hydroxyethyl cellulose, stir for 15-20 minutes to mix. The obtained brine slurry had a specific gravity of 1.43, a plastic viscosity of 7 mPas, a dynamic shear force of 6 Pa, and an API fluid loss of 8 mL.

[0065] It shows that the fluid loss and rheological properties of the salt water slurry described in the present invention are good.

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Abstract

The invention belongs to the field of oilfield chemistry, and particularly relates to a saturated saline solution mud fluid which is suitable for a rock salt layer, in particular for gypsolyte well drilling, and takes brine as a base solution, and a preparation method of the saturated saline solution mud fluid. The invention provides an application of brine to a saline solution mud fluid. The brine is a brine residual liquid left after brine evaporation of seawater; and the saline solution mud fluid is a saturated NaCl saline solution mud fluid. According to the NaCl-based saturated saline solution mud fluid, a waste product, i.e., brine solution left after brine evaporation of seawater is used, so that corrosion of rock salt under a high temperature condition can be suppressed; meanwhile, the dissolving of CaSO4, so that the diameter expansion of a gypsolyte well can be reduced effectively; and during drilling of the saline solution mud fluid in deep well gypsolyte, a large quantity of ions such as calcium ions and magnesium ions are contained, so that the dissolving of CaSO4 in the gypsolyte is suppressed remarkably, the well diameter expanding rate of the gypsolyte during well drilling can be lowered, and a series of well complex conditions caused by well irregularity are reduced.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to a brine-based saturated brine slurry which is suitable for drilling in rock-salt layers, especially for drilling in salt-gypsum layers, and a preparation method thereof. Background technique [0002] Drilling fluid is the circulating medium used in the drilling process. Drilling fluid has the functions of cleaning the bottom of the well and carrying cuttings; cooling and lubricating the drill bit and drill string; balancing the rock side pressure on the well wall, sealing and stabilizing the well wall; balancing the formation pressure; Settling speed; sand and cuttings can be removed on the ground; hydraulic power can be effectively transmitted; part of the gravity of the drill pipe and casing can be supported; a large amount of data on the drilled formation can be provided; rocks can be broken by hydraulic force and other important functions. [0003] During the dri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/16
Inventor 王天成宫俊林
Owner 中成新星油田工程技术服务股份有限公司