Process for preparing drilling fluid for preventing polycrystalline diamond compact (PDC) bit balling

A drill bit mud bag and drilling fluid technology, applied in the field of oil drilling, can solve the problems of rapid increase in specific gravity, poor inhibition of drilling fluid, poor lubrication performance, etc., and achieve the effects of increasing the proportion of the mud cake, improving the quality of the mud cake, and improving the lubricity.
CN101892036BInactive Publication Date: 2012-12-12中国石油集团川庆钻探工程有限公司长庆钻井总公司
0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
中国石油集团川庆钻探工程有限公司长庆钻井总公司
Publication Date
2012-12-12
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a process for preparing drilling fluid, in particular to a process for preparing the drilling fluid for preventing polycrystalline diamond compact (PDC) bit balling. The process comprises a construction process and a dosage formula of treating agents and is characterized in that: according to the dosage formula, the treating agents are prepared by mixing clear water polymer original slurry, poly anionic cellulose (PAC), calcium carbonate (QS-4), carboxymethyl starch (CMS), sulfonated phenolic resin(SMP-2), water dispersible cation emulsified asphalt powder (SFT-1), sodium chloride(NaCL) and sodium formate (WT-1) in a mass ratio of 1,000:2-3:30-40:20-30:2-3:1.5-2:50-100:20; and the construction process comprises the following steps of: according to a circulation circle, uniformly mixing a coating agent PAC, a filtrate reducer CMS, a salt and high-temperature resistant filtrate reducer SMP-2 and an anti-sloughing lubricant SFT-1 for 12h at first; adding QA-4, NaCL, WT-1 into the mixture and uniformly mixing the mixture; and regulating the mixture to have a density Rho of 1.06 to 1.10g / cm<3>, a funnel viscosity T of 38 to 45s and an API water loss FL of 4 to 6ml. The process has the advantages of effectively preventing the balling of a sticking bit and a PDC bit at a lower curved section, reducing a frictional resistance and a torque, eliminating a sticking phenomenon, improving a mechanical drilling rate and ensuring downhole safety.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a drilling fluid preparation process, especially a drilling fluid preparation process for preventing PDC bit balling. The process is suitable for the prevention of drill bit balling in the "shuangshi layer" formation of Sulige gas field, and belongs to oil drilling field. technical background

[0002] The "Shuangshi Formation" of the Sulige Gas Field belongs to the Permian system, and the burial depth of the formation is about 3000m to 3600m. The mudstone content in the formation is high and easy to hydrate and disperse, which greatly increases the content of mud or solid phase in the wellbore and is adsorbed on the surface of the drill bit. At the same time, this well section is just in the transition from clear water polymer to completion fluid, and the performance of the drilling fluid is poor immediately after conversion, such as large water loss, thick filter cake, poor inhibition, and poor lubrication performance. influe...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More