Water-based drilling fluids

一种水基钻井液、羧甲基的技术，应用在钻孔的组合物、化学仪器和方法等方向，能够解决钻孔密度和流变性不稳定等问题

Inactive Publication Date: 2007-06-27
HERCULES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For water-based drilling fluids, significant loss of water from the drilling fluid or loss of fluid into the formation can lead to irreversible changes in drilling fluid properties, such as instability in borehole density and rheology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Finely chopped RCL (52.7 g; "as is" weight (bulk density -26 g / 100 ml)) was added to a reactor containing a mixture of isopropanol (IPA) (473 g) and methanol (24 g) and stirred into a slurry. After sealing the reactor, the RCL slurry was cooled to 20°C and stirred at 100-600 rpm to achieve good, uniform mixing.

[0074] The reactor was freed from oxygen and sodium hydroxide solution (44.97 g sodium hydroxide dissolved in 73.4 g water) was added to the RCL slurry. The resulting RCL slurry was mixed for 1 hour at 20°C.

[0075]Then, a solution of monochloroacetic acid (MCA) (51.53 g MCA dissolved in 51.53 g isopropanol) was added to the RCL slurry, and the resulting reaction mixture was heated at 70° C. for 1 hour, cooled to room temperature, and then filtered. The dark brown residue was slurried in 80% (w / w) methanol / water mixture (800 g) and treated with glacial acetic acid (2.7 g). The resulting slurry was washed three times with 80% (w / w) methanol / water, then filter...

Embodiment 2

[0078] Example 1 was repeated with the following components. RCL was basified with components 1-5. After addition of components 6-9, the reaction mixture was heated at 70°C for 0.5 hours. Components 10 and 11 were then added and the resulting reaction mixture was heated at 70°C for 45 minutes.

[0079] 1. Two raw cotton linters - 53.7g (as is)

[0080] 2. Isopropanol - 368.2g

[0081] 3. Methanol - 19.5g

[0082] 4. Water - 68.8g

[0083] 5. Sodium Hydroxide (97.6% purity) - 31.26g

[0084] 6. Isopropanol - 30.6g

[0085] 7. Water - 7.35g

[0086] 8. Monochloroacetic acid (99.5% purity) - 44g

[0087] 9. Dichloroacetic acid - 0.44g

[0088] 10. Water - 2.6g

[0089] 11. Sodium Hydroxide (97.6% Purity) - 8g

[0090] The CM DS for CM-RCL was -1.18. The Brookfield viscosity of a 1% solution of the CM-RCL was 10,980 cPs as measured by a Brookfield DV-I+ viscometer with a #4 spindle at 30 rpm at 25°C.

Embodiment 3

[0092] Example 2 was repeated with 0.88 g of dichloroacetic acid.

[0093] The CM DS for CM-RCL was -1.18. The Brookfield viscosity of a 1% solution of the CM-RCL was 11,700 cPs as measured by a Brookfield DV-I+ viscometer with a #4 spindle at 30 rpm at 25°C.

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Abstract

A water-based drilling fluid composition includes water and at least one rheology modifier and / or fluid loss control agent, and at least one other ingredient of polymeric additive, inorganic salts, dispersants, shale stabilizers, weighting agents, or finely divided clay particles, depending upon the desired attributes, wherein the rheology modifier and / or the fluid loss control agent comprises carboxymethylated raw cotton linters (CM-RCL) made from the baled raw cotton linters or comminuted raw cotton linters with increased bulk density.

Description

technical field [0001] The present invention relates to the application of anion-carrying polymers in drilling fluids. More specifically, the present invention relates to the use of carboxymethylated raw cotton linters as effective additives for controlling the rheology and / or reducing fluid loss of water-based drilling fluids. Background technique [0002] Rotary drilling is the most commonly used drilling technique in oilfields today. Although drilling operations have matured, increased economic benefits from maximizing recovery capabilities have resulted in more complex drilling operations such as deepwater drilling, multi-well drilling, and horizontal drilling. In order to complete drilling operations as quickly and economically as possible, a great deal of planning and forecasting must be done during drilling projects. Among many other indicators, designing a well-adapted drilling fluid is one of the most critical factors for the success of a drilling operation. Dril...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/04
CPCC09K8/04
Inventor 莫罕德·墨尔布西阿尔琼·C.·萨乌
Owner HERCULES INC
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