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 the like, and achieve the effects of low cost requirements, low cost of raw materials and simple preparation process

Active Publication Date: 2006-07-19
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

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

[0016] 3 # Molybdenum disulfide complex lithium base 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 Fat 1%, fumed silica 3%, simethicone 2%.

[0017] The technical indicators are tested according to the industry standard SY5199, and the results are shown in Table 2.

[0018] Test items

[0019] This formula has been tried in 85 wells on site and can meet the needs of casing drilling within 2000 meters. For the Φ139.7×9.17P110 steel grade casing, its torque resistance can reach more than 20,000 Nm, and the sealing performance is good. High temperature resistance of 135℃.

Embodiment 2

[0020] Example 2: 3 # Molybdenum disulfide complex 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%.

[0021] The technical indicators are tested according to the industry standard SY5199, and the results are shown in Table 3.

[0022] Test items

Test results

Use the instrument

Test strip

Exterior color

Black paste

Visual inspection

Room temperature

Working penetration

(1 / 10mm), 150g

312

SYP4001Z

Coneness measurement

Refrigerator

25℃

253

-17.8℃

Dropping point °C

178

SYP4111

Thread grease drop point test

Tester

Room temperature

Evaporation volume V / V%

0.63

DGSB / 20

-002C

Desktop drying oven

100℃，24h

...

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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 grease used on a petroleum drilling pipe string, in particular to a thread grease for connecting casings specially used for casing drilling, and a preparation method thereof. Background technique [0002] As a very novel and creative new technology, casing drilling has attracted great attention from the oil drilling industry at home and abroad. 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 is completed simultaneously with the casing running operation. Casing drilling has the technical characteristics of the integration of drilling and completion, which can reduce drilling engineering costs and reduce downhole complexities and drilling accidents. A large number of casing drilling practices have shown that casing drilling ...

Claims

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Application Information

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Patent Type & Authority Applications(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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