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Drilling fluid for improving sliding efficiency of highly-deviated large cluster wells and construction method

A technology for highly deviated wells and construction methods, applied in wellbore/well components, chemical instruments and methods, earthwork drilling and production, etc., can solve problems such as complex situations and accidents, serious underpressure, poor results, etc. The effect of high screening rate, fast machine speed and low frictional resistance

Inactive Publication Date: 2019-11-22
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

[0004] In order to increase the viscosity and increase the density of the highly deviated well drilling fluid system currently in use, most of the insoluble solid phase components are added, such as bentonite, ultra-fine calcium carbonate, barite, etc. Inferior solid phases produced by slurry making lead to the mass volume percentage of total solid phases exceeding 15%. During sliding drilling, the friction resistance is large, the supporting pressure is serious, the drilling speed is slow, and the construction is inefficient. During the on-site construction, the sliding efficiency can be improved by treating the drilling fluid The method is limited, and the effect is not good, but it will cause large fluctuations in performance during ineffective treatment, causing complex situations and accidents in the mine

Method used

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  • Drilling fluid for improving sliding efficiency of highly-deviated large cluster wells and construction method

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Effect test

Embodiment 1

[0037] A drilling fluid for improving the sliding efficiency of large cluster wells and highly deviated wells, consisting of the following substances in mass percentage:

[0038] Inhibitors, 5-10%;

[0039] Soluble weighting agent, 12-17%;

[0040] Viscosity increasing fluid loss reducing agent, 1.3~1.85%;

[0041] Flow regulator, 0.1~0.5%;

[0042] The balance is water.

[0043] Principle of the present invention is as follows:

[0044] Drilling fluid does not add non-dissolved solid phases, such as bentonite, limestone, barite, etc., and uses soluble soluble weighting agents to increase the density. The inhibitor is used to inhibit the hydration of clay minerals. The cuttings particles are complete and the screening rate is high. ;Because there is no solid phase in the drilling fluid, the frictional resistance is lower than that of other drilling fluid systems, which is conducive to sliding drilling, and the sliding drilling tool surface is in place, the sliding drilling...

Embodiment 2

[0046] A drilling fluid for improving the sliding efficiency of large cluster wells and highly deviated wells, consisting of the following substances in mass percentage:

[0047] Inhibitor, 5%;

[0048] Soluble weighting agent, 12%;

[0049] Viscosity increase fluid loss reducer, 1.3%;

[0050] Flow regulator, 0.1%;

[0051] The rest is clear water.

[0052] In this embodiment, inorganic salts are selected as inhibitors, which can inhibit the hydration and dispersion of mud shale and prevent the drill bit bag and well wall from collapsing.

[0053] The soluble weighting agent is a compound salt composed of sodium formate, sodium sulfate and potassium sulfate, wherein the mass percentage of sodium formate is 35%, the mass percentage of sodium sulfate is 50%, and the mass percentage of potassium sulfate is 15%.

[0054] The viscosity-increasing and fluid-loss reducing agent is BLA-HV, a terpolymer of propylene monomers, purchased from Dongying Baolong Petroleum New Technolog...

Embodiment 3

[0057] A drilling fluid for improving the sliding efficiency of large cluster wells and highly deviated wells, consisting of the following substances in mass percentage:

[0058] Inhibitors, 7%;

[0059] Soluble weighting agent, 15%;

[0060] Viscosity increase fluid loss reducer, 1.5%;

[0061] Flow regulator, 0.2%;

[0062] The rest is clear water.

[0063] In this embodiment, the inorganic salt KCl is selected as the inhibitor, which is beneficial for recovery and reuse.

[0064] The soluble weighting agent is a compound salt composed of sodium formate, sodium sulfate and potassium sulfate, wherein the mass percentage of sodium formate is 40%, the mass percentage of sodium sulfate is 50%, and the mass percentage of potassium sulfate is 10%.

[0065] The viscosity-increasing and fluid-loss reducing agent is BLA-HV, a terpolymer of propylene monomers, purchased from Dongying Baolong Petroleum New Technology Co., Ltd. It can improve viscosity shear of drilling fluid, redu...

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Abstract

The invention provides a drilling fluid for improving the sliding efficiency of highly-deviated large cluster wells and a construction method. The drilling fluid is composed of the following substances in percentage by mass: 5-10% of an inhibitor; 12-17% of a soluble weighting agent; 1.3%-1.85% of a tackifying fluid loss agent; and 0.1%-0.5% of a flow pattern regulator, with the balance being water. Non-soluble solid phase such as bentonite, limestone and barite is not added into the drilling fluid, and the density is increased through soluble composite salt; inorganic salt KCl is added into the drilling fluid to inhibit hydration of clay minerals so that rock debris particles are complete, and the sieving rate is high; as the drilling fluid has no solid phase, the friction resistance is lower than that of other drilling fluid systems, and sliding drilling is facilitated; a sliding drilling tool face is in place, a sliding drilling machine speed is high, and the sliding efficiency is high. The drilling fluid is recyclable, easy to control performance, free of solid phase, high in inhibiting performance, low in friction resistance, free of sticky support during sliding, effectivelyimproves the sliding efficiency of highly-deviated large cluster wells, and has extremely high applicability to field production.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and in particular relates to a drilling fluid and a construction method for improving the sliding efficiency of large cluster wells and highly deviated wells. Background technique [0002] Highly deviated wells are a new type of directional wells implemented in recent years to increase the exposed area of ​​oil layers and increase the production of single wells. The well inclination angle generally reaches 60-86 degrees. [0003] During the drilling process of highly deviated wells, the well section drilled by sliding accounts for more than 25% of the whole well, and the efficiency of sliding increasing drilling determines the construction efficiency of the whole well of highly deviated wells. The sliding drilling is affected by formation factors, drilling fluid solid phase Content, drilling fluid lubricity and other factors have a great influence. [0004] In order to increase the vi...

Claims

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Application Information

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IPC IPC(8): C09K8/12E21B21/00
CPCC09K8/12C09K2208/28E21B21/00
Inventor 刘朝峰骆胜伟贾继国金虎张红新朱明明沈士军刘敏曲鹏飞刘龙成杨庆
Owner BC P INC CHINA NAT PETROLEUM CORP
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