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Dedicated thread compound for casing drilling

A casing drilling and thread grease technology, applied in the field of sealing thread grease, can solve problems such as casing thread sticking and other problems, and achieve the effects of low cost requirements, good temperature resistance, good sealing characteristics and lubricating characteristics

Active Publication Date: 2007-11-14
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

This invention mainly solves the problem that the casing thread is easy to cause sticking and buckling under the influence of complex loads such as tension, compression, bending, torsion, and vibration on the casing string of casing drilling, and develops special thread grease for casing drilling.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 3 # Molybdenum disulfide composite lithium grease 36%, expandable graphite 18%, 325 mesh zinc powder 12%, 200 mesh copper powder 3%, 200 mesh lead powder 23%, magnesium sulfonate 2%, sorbitan monooleic acid Grease 1%, fumed silica 3%, simethicone 2%.

[0018] The technical indicators are tested according to the industry standard SY5199, and the results are shown in Table 2.

[0019] Table 1 Example 1 Performance Test Result Table

[0020] Test items

[0021] Corrosive

[0022] This formula has been tested in 85 wells on site, and can meet the needs of casing drilling within 2000 meters. For Φ139.7×9.17P110 steel grade casing, its torque resistance can reach more than 20,000 Nm; the sealing performance is good. High temperature resistance 135°C.

Embodiment 2

[0023] Example 2: 3 # Molybdenum disulfide composite lithium grease 36%, expandable graphite 29%, 325 mesh zinc powder 12%, 200 mesh copper powder 3%, 200 mesh lead powder 5%, polytetrafluoroethylene 7%, magnesium sulfonate 2%, Sorbitan monooleate 1%, fumed silica 3%, simethicone 2%.

[0024] The technical indicators are tested according to the industry standard SY5199, and the results are shown in Table 3.

[0025] Table 2 Example 2 Performance Test Result Table

[0026] Test items

Test results

use the instrument

test strip

Exterior color

black paste

visual inspection

room temperature

Work penetration

(1 / 10mm), 150g

312

SYP4001Z

Penetration measurement

appliance, refrigerator

25℃

253

-17.8℃

Dropping point ℃

178

SYP4111

Thread grease drop test

detector

room temperature

Evaporation V / V%

0.63

D...

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PUM

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Abstract

The invention relates to a screw-thread grease for casing well drilling, wherein the constituents include (by weight percent): molybdenum disulfide composite lithium-based grease 10-50%, expanded graphite 10-30%, copper powder 1-10%, zinc powder 0-30%, lead powder 0-40%, magnesium sulfonate 0.1-5%, SP-80 0.1-8%, dimethyl silicon oil 0.1-5%, polytetrafluoroethylene 0-12%, gas phase silicon dioxide 1-15%. The screw-thread grease is prepared by using thickened mineral oil as carrying agent, charging solid substance, bulking agent, expanded graphite sealing material, then carrying out homogenization.

Description

technical field [0001] The invention relates to a sealing thread compound used on oil drilling strings, in particular to a thread compound specially used for connecting casings in casing drilling, and a preparation method thereof. Background technique [0002] Casing drilling, as a very novel and creative new technology, has attracted great attention from domestic and foreign oil drilling industries. Casing drilling has changed the conventional drilling operation mode, that is, the lower end of the casing string is connected to the drill bit, which drives the casing string and the drill bit to rotate, and the downhole rock breaking drilling and casing running operation are completed simultaneously. Casing drilling has the technical characteristics of drilling and completion integration, which can reduce drilling engineering costs and reduce downhole complex situations and drilling accidents. A large number of casing drilling practices show that casing drilling can save 10-1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M155/02C09K8/00C10M103/06C10N30/00
Inventor 王耀光宋生印刘养勤
Owner BC P INC CHINA NAT PETROLEUM CORP
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