Soilless potassium formate water-based drilling fluid for drilling shale

A potassium formate water-based drilling fluid technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of heavy maintenance and treatment workload, insufficient lubrication and anti-seize ability, poor stability of well wall, etc., and achieve cost Low, little impact on rheology, little environmental pollution

Inactive Publication Date: 2016-02-03
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages are: ① Poor stability of well wall; ② Relatively poor thermal stability, easy to gel at high temperature; ③ Poor pollution resistance (solid phase and CO 2 、H 2 S gas pollution), heavy maintenance and processing workload; ④ Insufficient lubrication and anti-seize ability

Method used

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  • Soilless potassium formate water-based drilling fluid for drilling shale
  • Soilless potassium formate water-based drilling fluid for drilling shale
  • Soilless potassium formate water-based drilling fluid for drilling shale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: a kind of preparation method of soilless potassium formate water-based drilling fluid for drilling into shale is:

[0016] First measure 1000 grams of tap water, add 15 grams of xanthan gum and stir for 6 minutes under electric stirring at a low speed of 500r / min, then add 5 grams of tackifier 80A-51 and stir for 5 minutes, add 380 grams of potassium formate and stir for 10 minutes, add 10 Add 0.5 g of calcium oxide and stir for 5 minutes, add 50 g of calcium carbonate (particle size: 37.5 μm: 12 μm: 6.8 μm = 1:3:1 mixed powder) and stir for 15 Minutes, add 20 grams of lubricant R-16 and stir for 5 minutes, add 50 grams of polyethylene glycol and stir for 5 minutes, add 30 grams of emulsified paraffin and stir for 10 minutes, add 10 grams of nano calcium carbonate (particle size is 80-200nm) in Stir for 5 minutes at 8000r / min, prepare a lye with a mass concentration of 40% with NaOH, adjust the pH of the system to 8.5, and stir for 1 hour to obtain a densi...

Embodiment 2

[0017] Example 2: Inhibition Evaluation

[0018] The rolling recovery rate of the drilling fluid system of the present invention was measured by using the XGRL-2 type roller heating furnace.

[0019] Table 2 Experimental results of rolling recovery rate of soil-free potassium formate water-based drilling fluid system

[0020] Drilling Fluid Formula

Experimental conditions

Recovery mass (g)

Recovery rate(%)

Clear water + 50g red bed soil

105℃ / 16h

5.64

11.28

Low-density water-based drilling fluid system + 50g red bed soil

105℃ / 16h

47.92

95.84

[0021] Note: 1) The red layer soil is Sichuan red layer soil debris, and the shale outcrop is Chang 7 shale outcrop, all of which are 6-10 mesh, and the recovery rate is over 40 mesh; 2) The results in the table are all 2 times The mean of the experimental data.

[0022] Table 3 Experimental results of linear expansion of water-based drilling fluid system

[0023]

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PUM

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Abstract

The invention relates to soilless potassium formate water-based drilling fluid for drilling shale which is used in long horizontal shale sections with developing microcracks. The soilless potassium formate water-based drilling fluid can inhibit the hydration collapse of shale formations, seal the nano-micropores and nano-microcracks of shale and solve the problem of stabilizing well walls. The technical solvent is that the materials for preparing the drilling fluid and contents (mass unit: gram) thereof are as follows: 12g to 18g of xanthan gum as a shear strength-improving agent; 4g to 8g of tackifier 80A-51; 350g to 400g of potassium formate; 8g to 12g of filtrate reducer CG810S-P; 0.3g to 0.6g of calcium oxide; 40g to 60g of calcium carbonate; 10g to 30g of lubricant R-16; 40g to 60g of polyethylene glycol; 25g to 35g of emulsified paraffin; 5g to 15g of nano calcium carbonate; 900g to 1200g of tap water; a sodium hydroxide solvent with the concentration of 40 percent. The tap water is first weighed and added with the xanthan gum while agitated under 500r / min, the treatment agents, such as the 80A-51, the potassium formate, the CG810S-P, the CaO, the CaCO3 and the R-16, are then sequentially added, the pH of the system is then regulated to 8.5, and thereby the drilling fluid is produced. The environment pollution of a drilling fluid system is little, and the drilling fluid system has good rheological property and strong inhibiting and sealing capabilities, and can be used in shale drilling.

Description

technical field [0001] The invention relates to a soilless potassium formate water-based drilling fluid for drilling shale, which has strong effects of inhibiting hydration dispersion and plugging, and is particularly suitable for drilling long horizontal well sections of shale with micro-fractures. Background technique [0002] According to the characteristics of shale gas accumulation, the development of shale gas is mainly based on shallow extended-reach wells and cluster horizontal wells. Due to the well-developed fractures and strong water sensitivity in shale formations, not only lost circulation, collapse, diameter shrinkage and other problems are prone to occur in long horizontal section drilling, but also friction, rock carrying and formation Pollution and other issues, thus increasing the probability of downhole complex situations. Therefore, in the drilling of shale gas horizontal wells, it becomes the key to the selection and design of drilling fluids to solve t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
CPCC09K8/12C09K2208/34
Inventor 王平全白杨陈婷王波时海涛余冰洋石晛
Owner SOUTHWEST PETROLEUM UNIV
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