Salt-resistant strong-inhibitive reservoir-protecting drilling fluid

A technology of strong inhibition and drilling fluid, applied in the field of salt resistance, protection of reservoir drilling fluid, strong inhibition, and additives, it can solve the problems of borehole shrinkage, difficult rheological control, and well wall spalling, etc., to improve the pressure bearing. Ability, inhibition of hydration and dispersion, good protection effect

Inactive Publication Date: 2012-02-15
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

[0002] In some oilfields, there are salt-gypsum layers in the process of exploration and development, which seriously pollute the drilling fluid, wellbore spalling and reservoir leakage, etc.
The main manifestations are that there are large sections of gypsum-salt layer in the upper part, the drilling fluid is seriously polluted during the drilling process, the fluid loss is large, and the rheology is difficult to control; the large section of strong water-sensitive shale in the lower part is very easy to cause wellbore shrinkage due to water absorption and swelling , spalling; reservoir porosity is large, continuous leakage during drilling, d

Method used

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  • Salt-resistant strong-inhibitive reservoir-protecting drilling fluid
  • Salt-resistant strong-inhibitive reservoir-protecting drilling fluid

Examples

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Comparison scheme
Effect test

Embodiment 1

[0009] Example 1. 2 Kg of bentonite, 1 Kg of anti-saline soil, 0.1 Kg of soda ash, 100 Kg of water, 0.8 Kg of viscosity enhancing agent ST-MH, 3 Kg of fluid loss reducer, 0.2 Kg of shale inhibitor SET-H, organic Compound salt BPC 3 Kg, bridging plugging agent MF-II 2 Kg and biological enzyme storage agent CVS 2 Kg are mixed into the drilling fluid of the present invention.

Embodiment 2

[0010] Example 2. 3 Kg of bentonite, 1 Kg of anti-saline soil, 0.15 Kg of soda ash, 100 Kg of water, 0.6 Kg of viscosity enhancing agent ST-MH, 2 Kg of fluid loss reducer, 0.4 Kg of shale inhibitor SET-H, organic Compound salt BPC 2 Kg, bridging plugging agent MF-II 4 Kg and biological enzyme storage agent CVS 2 Kg are mixed into the drilling fluid of the present invention.

Embodiment 3

[0011] Example 3. 4 Kg of bentonite, 3 Kg of anti-saline soil, 0.2 Kg of soda ash, 100 Kg of water, 0.4 Kg of viscosity enhancing agent ST-MH, 2 Kg of fluid loss reducer, 0.6 Kg of shale inhibitor SET-H, and 0.6 Kg of organic Compound salt BPC 2 Kg, bridging plugging agent MF-II 6 Kg and biological enzyme storage agent CVS 2 Kg are mixed into the drilling fluid of the present invention.

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Abstract

The invention relates to a salt-resistant strong-inhibitive reservoir-protecting drilling fluid which comprises the following components in part by weight: 2-4 parts of bentonite, 1-3 parts of salt-resistant clay, 0.1-0.2 part of sodium carbonate, 100 parts of water, 0.4-0.8 part of tackifier ST-MH, 2-3 parts of fluid loss additive KNT, 0.2-0.6 part of shale inhibitor, 2-6 parts of organic composite sylvite BPC, 2-3 parts of bridge additive and 2-3 parts of biological enzyme storage agent. The drilling fluid has strong salt bed resistance, pollution resistance and inhibitive ability.

Description

technical field [0001] The invention relates to an additive used in the field of oil field drilling, in particular to a salt-resistant, strong-inhibiting, and reservoir-protecting drilling fluid. Background technique [0002] In some oil fields, there are salt-gypsum layers in the process of exploration and development, which seriously pollute the drilling fluid, wellbore spalling and reservoir leakage and other problems. The main manifestations are that there are large sections of gypsum-salt layer in the upper part, the drilling fluid is seriously polluted during the drilling process, the fluid loss is large, and the rheology is difficult to control; the large section of strong water-sensitive shale in the lower part is very easy to cause wellbore shrinkage due to water absorption and swelling , spalling; the porosity of the reservoir is large, the leakage continues during the drilling process, and the drilling fluid and harmful solid phase seriously pollute the reservoir....

Claims

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Application Information

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IPC IPC(8): C09K8/24C09K8/42
Inventor 竹学友刘永贵宋广顺何恕邹大鹏李海刘振华
Owner BC P INC CHINA NAT PETROLEUM CORP
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